Patent Publication Number: US-2023164950-A1

Title: Air conditioning apparatus and electric control box

Description:
CROSS-REFERENCES TO RELATED APPLICATIONS 
     The present disclosure is a national phase application of International Application No. PCT/CN2021/114356, filed on Aug. 24, 2021, which claims the priority of the Chinese patent application No. 202021821860.9, filed on Aug. 26, 2020, the Chinese patent application No. 202120368191.2, filed on Feb. 8, 2021, the entireties of which are herein incorporated by reference. 
     FIELD 
     The present disclosure relates to the field of air conditioners, and in particular to an air conditioning apparatus and an electric control box. 
     BACKGROUND 
     Electronic elements are usually arranged inside an electric control box of an air conditioning apparatus. The electronic elements may operate to generate heat and cause a temperature inside the electric control box to be high. The cooling medium in a heat dissipation member inside the electric control box may reduce a temperature of the heat dissipation member. 
     When the air that is in the electric control box and is in a high temperature contacts the heat dissipation member, the air may be condensed into water. When the condensed water flows to a location where the electronic elements are arranged, the electronic elements may be short-circuited or damaged, or in more serious cases, a fire may be caused. 
     SUMMARY 
     According to some embodiments of the present disclosure, an electric control box is provided and includes: a box body, defining a mounting cavity; a mounting plate, received in the mounting cavity to divide the mounting cavity into a first chamber and a second chamber, and the first chamber and the second chamber are disposed on two sides of the mounting plate respectively; an electronic element, received in the second cavity; and a heat dissipation member, comprising a heat exchanging body and a fluid-collecting tube assembly, and the fluid-collecting tube assembly is configured to provide a cooling medium to the heat exchanging body, at least part of the heat exchanging body is received in the first cavity and is thermal-conductively connected to the electronic element, the mounting plate is configured to prevent condensed water on the heat dissipation member from flowing into the second cavity. 
     According to another embodiment of the present disclosure, an air conditioning apparatus is provided and includes an air conditioning body and the electric control box as described in the above. The electric control box is detachably connected to the air conditioning body. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The accompanying drawings are incorporated with the specification and form a part of the specification. The drawings illustrate embodiments in accordance with the present disclosure. The drawings and the specification are cooperatively described to illustrate embodiments of the present disclosure. 
         FIG.  1    is a structural schematic view of an air conditioning system according to an embodiment of the present disclosure. 
         FIG.  2    is a structural schematic view of a heat exchanging body of a heat exchanger shown in  FIG.  1   . 
         FIG.  3    is a structural schematic view of single-layered micro channels and multi-layered micro channel shown in  FIG.  2   . 
         FIG.  4    is a structural schematic view of a fluid-collecting tube assembly in the heat exchanger shown in  FIG.  1    according to an embodiment of the present disclosure. 
         FIG.  5    is a structural schematic view of a fluid-collecting tube assembly in the heat exchanger shown in  FIG.  1    according to another embodiment of the present disclosure. 
         FIG.  6    is a structural schematic view of a fluid-collecting tube assembly in the heat exchanger shown in  FIG.  1    according to still another embodiment of the present disclosure. 
         FIG.  7    is a structural schematic view of a heat exchanging body of a heat exchanger shown according to another embodiment of the present disclosure. 
         FIG.  8    is a perspective view of a first tube arrangement plane shown in  FIG.  7   . 
         FIG.  9    is a structural schematic view of a heat exchanging body of a heat exchanger shown according to still another embodiment of the present disclosure. 
         FIG.  10    is a structural schematic view of the heat exchanger shown in  FIG.  9   . 
         FIG.  11    is a perspective view of an electric control box omitting some components according to an embodiment of the present disclosure. 
         FIG.  12    is a perspective view of the heat exchanger shown in  FIG.  11   . 
         FIG.  13    is a perspective view of the heat exchanger according to another embodiment of the present disclosure. 
         FIG.  14    is a perspective view of a fixing bracket engaged with the heat dissipation member according to an embodiment of the present disclosure. 
         FIG.  15    is a perspective view of a fixing bracket engaged with the heat dissipation member according to another embodiment of the present disclosure. 
         FIG.  16    is a perspective view of a heat dissipation fixing plate engaged with the heat dissipation member according to an embodiment of the present disclosure. 
         FIG.  17    is a planar view of a heat dissipation fixing plate according to an embodiment of the present disclosure. 
         FIG.  18    is a cross sectional view of a heat dissipation member engaged with an electric control box according to an embodiment of the present disclosure. 
         FIG.  19    is a cross sectional view of a heat dissipation member engaged with an electric control box according to another embodiment of the present disclosure. 
         FIG.  20    is a perspective view of a heat dissipation fin engaged with the heat dissipation member according to an embodiment of the present disclosure. 
         FIG.  21    is a perspective view of a heat dissipation fin engaged with the heat dissipation member according to another embodiment of the present disclosure. 
         FIG.  22    is a perspective view of a heat dissipation member according to another embodiment of the present disclosure. 
         FIG.  23    is a planar view of a heat dissipation member engaged with the electric control box according to another embodiment of the present disclosure. 
         FIG.  24    is a cross sectional view of a heat dissipation member engaged with the electric control box according to another embodiment of the present disclosure. 
         FIG.  25    is a planar view of a heat dissipation member engaged with the electric control box according to another embodiment of the present disclosure. 
         FIG.  26    is a cross sectional view of a heat dissipation member engaged with the electric control box according to another embodiment of the present disclosure. 
         FIG.  27    is a planar view of a heat dissipation member engaged with the electric control box according to another embodiment of the present disclosure. 
         FIG.  28    is a cross sectional view of the heat dissipation member engaged with the electric control box shown in  FIG.  27   . 
         FIG.  29    is a cross sectional view of the heat dissipation member engaged with the electric control box according to another embodiment of the present disclosure. 
         FIG.  30    is a perspective view of an electric control box omitting some components according to another embodiment of the present disclosure. 
         FIG.  31    is a perspective view of an electric control box omitting some components according to another embodiment of the present disclosure. 
         FIG.  32    is a planar view of an electric control box omitting some components according to another embodiment of the present disclosure. 
         FIG.  33    is a cross sectional view of the electric control box shown in  FIG.  32   . 
     
    
    
     DETAILED DESCRIPTION OF THE DISCLOSURE 
     Embodiments of the present disclosure will be clearly and completely described below by referring to the accompanying drawings in the embodiments of the present disclosure. Apparently, the embodiments described are only a part of but not all of the embodiments of the present disclosure. 
     The term “embodiment” in the present disclosure means that particular features, structures or properties described in an embodiment may be included in at least one embodiment of the present disclosure. The presence of the term in various sections of the specification does not necessarily mean a same embodiment, nor a separate or some embodiment that is mutually exclusive with other embodiments. 
     As shown in  FIG.  1   ,  FIG.  1    is a structural schematic view of an air conditioning system according to an embodiment of the present disclosure. As shown in  FIG.  1   , the air conditioning system  1  may include a compressor  2 , a four-way valve  3 , an outdoor heat exchanger  4 , an indoor heat exchanger  5 , a heat exchanger  6 , an expansion valve  12  and another expansion valve  13 . The another expansion valve  13  and the heat exchanger  6  are disposed between the outdoor heat exchanger  4  and the indoor heat exchanger  5 . The compressor  2  provides a circulating cooling medium flowing between the outdoor heat exchanger  4  and the indoor heat exchanger  5  through the four-way valve  3 . 
     The heat exchanger  6  includes a first heat exchanging channel  610  and a second heat exchanging channel  611 . A first end of the first heat exchanging channel  610  is connected to the outdoor heat exchanger  4  via the another expansion valve  13 . A second end of the first heat exchanging channel  610  is connected to the indoor heat exchanger  5 . A first end of the second heat exchanging channel  611  is connected to the second end of the first heat exchanging channel  610  via the expansion valve  12 , and a second end of the second heat exchanging channel  611  is connected to an air intaking port  22  of the compressor  2 . 
     When the air conditioning system  1  is in refrigerating, a flowing path of the cooling medium is shown in the following. 
     An air outputting port  21  of the compressor  2 —a connection port  31  of the four-way valve  3 —a connection port  32  of the four-way valve  3 —the outdoor heat exchanger  4 —the heat exchanger  6 —the indoor heat exchanger  5 —a connection port  33  of the four-way valve  3 —a connection port  34  of the four-way valve  3 —the air intaking port  22  of the compressor  2 . 
     A flowing path of the cooling medium in the first heat exchanging channel  610  (a primary path) is as follows: the first end of the first heat exchanging channel  610 —the second end of the first heat exchanging channel  610 —the indoor heat exchanger  5 . A flowing path of the cooling medium in the second heat exchanging channel  611  (a secondary path) is as follows: the second end of the first heat exchanging channel  610 —the expansion valve  12 —the first end of the second heat exchanging channel  611 —the second end of the second heat exchanging channel  611 —the air intaking port  22  of the compressor  2 . 
     For example, in the above case, a working principle of the air conditioning system  1  may be as follows. The outdoor heat exchanger  4  serves as a condenser, and outputs a cooling medium having a medium pressure and a medium temperature (a liquid phase cooling medium having a temperature of 40°) via the another expansion valve  13 . The cooling medium in the first heat exchanging channel  610  has a medium pressure and a medium temperature. The expansion valve  12  converts the cooling medium flow having the medium pressure and the medium temperature into a cooling medium having a low pressure and a low temperature (the cooling medium may be in a two phase of gas and liquid, and may have a temperature of 10°). The cooling medium in the second heat exchanging channel  611  may have a low pressure and a low temperature. The low-pressure and low-temperature cooling medium in the second heat exchanging channel  611  absorbs heat from the medium-pressure and medium-temperature cooling medium in the first heat exchanging channel  610 , and the cooling medium in the second heat exchanging channel  611  is gasified to sub-cool the cooling medium in the first heat exchanging channel  610 . The gasified cooling medium in the second heat exchanging channel  611  blasts air to the compressor  2  to increase enthalpy, increasing a refrigerating capacity of the air conditioning system  1 . 
     The expansion valve  12  serves as a flow adjustment component for the second heat exchanging channel  611  and adjusts the amount of the cooling medium flowing in the second heat exchanging channel  611 . Heat exchange may be performed between the cooling medium flowing in the first heat exchanging channel  610  and the cooling medium flowing in the second heat exchanging channel  611  to sub-cool the cooling medium flowing in the first heat exchanging channel  610 . Therefore, the heat exchanger  6  may act as an economizer for the air conditioning system  1 , increasing a degree of subcooling, further increasing a heat exchanging efficiency of the air conditioning system  1 . 
     Further, in a heating mode, the connection port  31  of the four-way valve  3  is connected to the connection port  33 , and the connection port  32  of the four-way valve  3  is connected to the connection port  34 . The cooling medium output from air outputting port  21  of the compressor  2  flows from the indoor heat exchanger  5  to the outdoor heat exchanger  4  and takes the indoor heat exchanger  5  as the condenser. In this case, the cooling medium output from the indoor heat exchanger  5  is divided into two paths. For one of the two paths, the cooling medium enters the first heat exchanging channel  610  (the primary path). For the other one of the two paths, the cooling medium enters the second heat exchanging channel  611  (the secondary path) via the expansion valve  12 . The cooling medium of the second heat exchanging channel  611  may sub-cool the cooling medium of the first heat exchanging channel  610 . The cooling medium that flows through the second heat exchanging channel  611  supplies air for the compressor  2  to increase enthalpy to improve a heating capacity of the air conditioner. 
     According to the present disclosure, the overall structure of the air conditioning system  1  as described above are optimized in the following embodiments. 
     1. Micro-Channel Heat Exchanger 
     As shown in  FIG.  2   , the heat exchanger  6  includes a heat exchanging body  61 . The heat exchanging body  61  defines micro-channels  612 . The micro-channels  612  include a first micro-channel and a second micro-channel. The first micro-channel serves as the first heat exchanging channel  610  of the heat exchanger  6 , and the second micro-channel serves as the second heat exchanging channel  611  of the heat exchanger  6 . Therefore, the first micro-channel  610  and the first heat exchanging channel  610  are indicated by a same reference numeral, and the second micro-channel  611  and the second heat exchanging channel  611  are indicated by a same reference numeral. 
     The heat exchanging body  61  may include a single plate body  613 . The plate body  613  defines micro-channels  612 . The micro-channels  612  of the plate body  613  include first micro-channels  610  and second micro-channels  611 , and the first micro-channels  610  and the second micro-channels  611  are arranged alternately. The first micro-channel  610  extends along an extension direction D 1 , the second micro-channel  610  extends along an extension direction D 2 , and the extension direction D 1  is parallel to the extension direction D 2 . For example, the extension direction D 1  of the first micro-channel  610  is the same as the extension direction D 2  of the second micro-channel  611 . The plate body  613  may be a flat tube, and heat dissipation elements or electronic elements may be arranged on the plate body  613 . In some embodiments, the plate body  613  may be a carrier having a cross section in other shapes, such as having a cylinder cross section, a rectangular cross section, a square cross section, and so on. In some embodiments, as described in the following, the heat exchanging body  61  may include at least two plate bodies or two tube bodies. The two plate bodies may be laminated with each other. For the two tube bodies, one of the two tube bodies may sleeve the other tube bodies. 
     For each micro-channel  612 , the micro-channel  612  may have a cross section perpendicular to the extension direction of the micro-channel  612 , and the cross section may be rectangular. A side length of the micro-channel may be 0.5 mm-3 mm. For each micro-channel  612 , a distance between the micro-channel  612  and a surface of the plate body  613  may be 0.2 mm-0.5 mm, and a distance between two adjacent micro-channels  612  may be 0.2 mm-0.5 mm, and the micro-channels  612  may meet requirements of pressure resistance and heat exchanging performance. In some embodiments, the cross section of the micro-channel  612  may be in other shapes, such as circular, triangular, trapezoidal, oval or irregular. 
     For example, when the air conditioning system shown in  FIG.  1    is in the refrigerating mode, the first cooling medium (i.e., the cooling medium having the medium pressure and the medium temperature) flows through the first micro-channels  610 , and the second cooling medium (i.e., the cooling medium having the low pressure and the low temperature) flows through the second micro-channels  611 . The first cooling medium may be a liquid phase medium, and the second cooling medium may be a medium in two phases of liquid and gas. While the second cooling medium flowing along the second micro-channels  611 , the second cooling medium absorbs heat from the first cooling medium flowing in the first micro-channels  610  to sub-cool the first cooling medium. 
     To be noted that, the heat exchanger having the micro-channels as described in the above and in the following may not be limited to the application scenarios shown in  FIG.  1   . Therefore, the terms “first” and “second” in the first micro-channel  610 , the second micro-channel  611 , the first cooling medium and the second cooling medium are used to distinguish different micro-channels and different cooling media only, and shall not be interpreted as limiting specific applications of the micro-channels and the cooling media. For example, in other embodiments or other operating modes, the first cooling medium flowing through the first micro-channels  610  may absorb heat from the second cooling medium flowing through the second micro-channels  611 . Further, the first cooling medium and the second cooling medium may not be limited as being in the liquid phase or the liquid-gas phase as described in the above. 
     As shown in  FIG.  1   , a flowing direction Al of the first cooling medium is opposite to a flowing direction A 2  of the second cooling medium, and there is a large temperature difference between a temperature of the first cooling medium and a temperature of the second cooling medium, and the heat exchanging efficiency between the first cooling medium and the second cooling medium may be improved. 
     In some embodiments, the flowing direction Al of the first cooling medium may be the same as or perpendicular to the flowing direction A 2  of the second cooling medium. 
     In some embodiments, the heat exchanging body  61  may include at least two sets of first micro-channels  610  and second micro-channels  611 . One set of the at least two sets of first micro-channels  610  and second micro-channels  611  are spaced apart from another set of the at least two sets of first micro-channels  610  and second micro-channels  611  in the direction perpendicular to the extension direction D 1 . As shown in  FIG.  2   , the direction perpendicular to the extension direction D 1  may be a width direction of the plate body  613 . In some embodiments, the direction perpendicular to the extension direction D 1  may be a thickness direction of the plate body  613 . For example, the first predetermined number of micro-channels may be selected from the plurality of micro-channels  612  and may be determined as the first micro-channels  610 , and the second predetermined number of micro-channels may be selected from the plurality of micro-channels  612  and determined as the second micro-channels  611 . Sets of the first micro-channels  610  and sets of the second micro-channels  611  are arranged alternately. That is, a second micro-channel  611  is arranged between the two sets of the first micro-channels  610 , and a first micro-channel  610  is arranged between the two sets of the second micro-channels  611 , and the at least two sets of the first micro-channels  610  are spaced apart from each other, and the at least two sets of the second micro-channels  611  are spaced apart from each other. In this way, the heat exchanger  6  having the first micro-channels  610  and the second micro-channels  611  arranged alternately may be formed, as shown in  FIG.  2   . The first predetermined number and the second predetermined number may be equal, such as 3. In some embodiments, the first predetermined number may be different from the second predetermined number, such as the first predetermined number being  3 , and the second predetermined number being  2 . 
     In some embodiments, each of the first predetermined number and the second predetermined number may be  1 . One of the plurality of micro-channels  612  is the first micro-channel  610 , and one micro-channel that is arranged adjacent to the first micro-channel  610  may be the second micro-channel  611 . 
     For example, the heat exchanging body  61  may have 10*10 micro-channels  612 . An area of the cross section of the heat exchanging body  61  is the same as an area of a conventional channel. An equal mass and an equal amount of the cooling medium may flow through each of the 10*10 micro-channels  612  and the conventional channel. A characteristic length Dh of each of the 10*10 micro-channels  612  is 1/10 of a characteristic length of the conventional channel, and a pressure drop is proportional to L/(Dh2). When the micro-channel and the conventional channel have a same pressure drop, a length L of the micro-channel  612  may be 1/100 of a length of the conventional channel. 
     An effective heat exchanging area of the micro-channel  612  may be 1/10 of an effective heat exchanging area of the conventional channel. According to a formula: a heat exchanging coefficient*the characteristic length=a constant, the heat exchanging coefficient of the micro-channel  612  may be 10 times of the heat exchanging coefficient of the conventional channel. According to the formula: the amount of exchanged heat=heat exchanging coefficient*a heat exchanging area, the amount of exchanged heat of the micro-channel  612  may be equal to the amount of exchanged heat of the conventional channel. Therefore, when the length of the 10*10 micro-channels  612  may be 1/100 of the length of conventional channel, the micro-channels and the conventional channel may satisfy a same heat loading requirement. 
     According to the above embodiments, the heat exchanging body  61  defines the plurality of first micro-channels  610  and the plurality of second micro-channels  611  to reduce a length of the heat exchanging body  61 . A size of the heat exchanger  6  may be reduced, and the amount of exchanged heat of the heat exchanger  6  may be the same as the amount of exchanged heat of the economizer. 
     As shown in  FIG.  3   , the plurality of micro-channels  612  may be configured as single-layered micro-channels or multi-layered micro-channels. In  FIG.  3   , an area of a cross section of the multi-layered micro-channels is four times of an area of a cross section of the single-layered micro-channel, and a length of the single-layered micro-channels is four times of a length of the multi-layered micro-channels. When a mass and an amount of the cooling medium flows through the single-layered micro-channels is equal to a mass and an amount of the cooling medium flows through the multi-layered micro-channels, a flowing speed of the cooling medium in the multi-layered micro-channels may be ¼ of a flowing speed of the cooling medium in the single-layered micro-channels. 
     When the cooling medium is in a laminar flowing state, a pressure drop of the multi-layered micro-channels may be 1/16 of a pressure drop of the single-layered micro-channels. Since the heat exchanging coefficient*the characteristic length=the constant, when the characteristic length remains unchanged, when the heat exchanging coefficient remains unchanged, and when a heat exchanging area of the single-layered micro-channels and a heat exchanging area of the multi-layered micro-channels remain unchanged, the amount of the exchanged heat of the single-layered micro-channels may be equal to the amount of the exchanged heat of the multi-layered micro-channels. Therefore, when the cooling medium is flowing at a low flowing speed and is in the laminar flowing state, the larger the area of the cross section of the plurality of micro-channels  612 , the shorter the length of the plurality of micro-channels  612 , and a flow resistance loss of the cooling medium may be reduced. 
     When the cooling medium is in a turbulent flowing state, the pressure drop of the multi-layered micro-channel may be  1 / 48  of the pressure drop of the single-layered micro-channels. In this case, the heat exchanging coefficient has a functional relationship with the flowing speed of the cooling medium. The higher the flowing speed of the cooling medium, the greater the heat exchanging coefficient. Therefore, the amount of the exchanged heat of the single-layered micro-channels may be greater than the amount of the exchanged heat of the multi-layered micro-channels. In summary, when the amount of the exchanged heat can be satisfied, the area of the cross section of the plurality of micro-channels  612  may be larger to reduce the flow resistance loss of the cooling medium. 
     1.1 Fluid-Collecting Tube Assembly 
     As shown in  FIG.  4   , the heat exchanger  6  may further include a fluid-collecting tube assembly  62 . The fluid-collecting tube assembly  62  and the heat exchanger body  61  may be arranged horizontally. For example, the fluid-collecting tube assembly  62  and the heat exchanger body  61  may be arranged along a horizontal plane. In some embodiments, the fluid-collecting tube assembly  62  may be arranged vertically. That is, the fluid-collecting tube assembly  62  is arranged in a direction perpendicular to the horizontal plane (i.e., in a gravitational direction), and the heat exchanger body  61  is arranged horizontally. In some embodiments, the fluid-collecting tube assembly  62  is arranged vertically, and the heat exchanger body  61  is arranged vertically. In some embodiments, the fluid-collecting tube assembly  62  is arranged horizontally, and the heat exchanger body  61  is arranged vertically. 
     The fluid-collecting tube assembly  62  may include a first fluid-collecting tube  621  and a second fluid-collecting tube  622 . The first fluid-collecting tube  621  has a first fluid-collecting channel, and the second fluid-collecting tube  622  has a second fluid-collecting channel. The heat exchanger  6  has a cross section along a direction that the cooling medium (the first cooling medium or the second cooling medium) flows in the heat exchanging body  61 , and the cross section is I shaped. In some embodiments, the cross section may be L shaped, U shaped, G shaped, circular, and so on. 
     The first fluid-collecting channel is communicated with the first micro-channel  610 , and the first cooling medium may be provided to the first micro-channel  610  through the first fluid-collecting channel; and/or the first cooling medium that flows through the first micro-channel  610  may be collected. In the present embodiment, two first fluid-collecting tubes  621  are arranged and are connected to two ends of the first micro-channel  610  respectively. In this way, the first cooling medium may be provided to the first micro-channel  610  through the one of the two first fluid-collecting tubes  621 , and the first cooling medium that flows through the first micro-channel  610  may be collected through the other one of the two first fluid-collecting tubes  621 . 
     For example, in the air conditioning system shown in  FIG.  1   , the first end of the first micro-channel  610  is connected to the outdoor heat exchanger  4  through one of the two first fluid-collecting tubes  621  via the expansion valve  13 . In this way, in the refrigerating mode, the first cooling medium may be provided to the first micro-channel  610 . The second end of the first micro-channel  610  is connected to the indoor heat exchanger  5  through the other one of the two first fluid-collecting tubes  621 , and the first cooling medium flowing through the first micro-channel  610  may be collected. In the heating mode, since the first cooling medium may flow in the first micro-channel  610  in an opposite direction, functions of the two first fluid-collecting tubes  621  may be interchanged compared to the functions in the refrigerating mode. 
     The second fluid-collecting channel is communicated with the second micro-channel  611 , and the second cooling medium may be provided to the second micro-channel  611  through the second fluid-collecting channel; and/or the second cooling medium that flows through the second micro-channel  611  may be collected. In the present embodiment, two second fluid-collecting tubes  622  are arranged and are connected to two ends of the second micro-channel  611  respectively. In this way, the second cooling medium may be provided to the second micro-channel  611  through the one of the two second fluid-collecting tubes  622 , and the second cooling medium that flows through the second micro-channel  611  may be collected through the other one of the two second fluid-collecting tubes  622 . 
     For example, in the air conditioning system shown in  FIG.  1   , the first end of the second micro-channel  611  is connected to the expansion valve  12  through one of the two second fluid-collecting tubes  622  to provide the second cooling medium to the second micro-channel  611 . The second end of the second micro-channel  611  is connected to the air intaking port  22  of the compressor  2  through the other one of the two second fluid-collecting tubes  622  to collect the second cooling medium flowing through the second micro-channel  611 . 
     In an embodiment, for the at least two sets of first micro-channels  610  and second micro-channels  611 , same ends of the first micro-channels  610  are connected to one first fluid-collecting tube  621 ; and same ends of the second micro-channels  611  are connected to one second fluid-collecting tube  622 . That is, the same ends of all first micro-channels  610  of the heat exchanger  6  are connected to one first fluid-collecting tube  621 , and the same ends of all the second micro-channels  611  of the heat exchanger  6  are connected to one second fluid-collecting tube  622 . In this way, a corresponding fluid-collecting tube may not be arranged for each of the micro-channels, and costs may be reduced. 
     According to the embodiment shown in  FIG.  4   , since the extension direction D 1  of the first micro-channel  610  is parallel to the extension direction D 2  of the second micro-channel  611 , an extension direction of the first fluid-collecting tube  621  is parallel to the extension direction of the second fluid-collecting tube  622 . However, in some embodiments, the extension directions of the first fluid-collecting tube  621  and the second fluid-collecting tube  622  may be adjusted based on the extension directions of the first micro-channel  610  and the second micro-channel  611 . For example, the extension direction of the first fluid-collecting tube  621  may be perpendicular to the extension direction of the second fluid-collecting tube  622 . 
     1.2 First Fluid-Collecting Tube Being Spaced Apart From Second Fluid-Collecting Tube 
     As shown in  FIG.  4   , the first fluid-collecting tube  621  is spaced apart from the second fluid-collecting tube  622  along the extension direction of the heat exchanging body  61 . The extension direction of the heat exchanging body  61  is the same as the extension direction D 1  of the first micro-channel  610  and the extension direction D 2  of the second micro-channel  611 . The second micro-channel  611  extends through the first fluid-collecting tube  621  and is connected to the second fluid-collecting tube  622 . The first fluid-collecting tube  621  is disposed between the second fluid-collecting tube  622  and the heat exchanging body  61 . The second micro-channel  611  extends through the first fluid-collecting tube  621  and is inserted into and welded with the second fluid-collecting tube  622 . The first micro-channel  610  is inserted into and welded with the first fluid-collecting tube  621 . In some embodiments, the first micro-channel  610  may extend through the second fluid-collecting tube  622  and is further inserted into the first fluid-collecting tube  621 . 
     A distance between the first fluid-collecting tube  621  and the second fluid-collecting tube  622  is R-2R. The R is a maximum cross-sectional dimension of the first fluid-collecting tube  621  along a spacing direction of the first fluid-collecting tube  621  and the second fluid-collecting tube  622 . Each of the cross section of the first fluid-collecting tube  621  and the cross section of the second fluid-collecting tube  622  may be circular. The R may be a diameter of the first fluid-collecting tube  621  or a diameter of the second fluid-collecting tube  622 . In some embodiments, the cross section of the first fluid-collecting tube  621  and the cross section of the second fluid-collecting tube  622  may be in other shapes, such as oval, square, rectangular or irregular. When the cross section of the first fluid-collecting tube  621  and the cross section of the second fluid-collecting tube  622  are not circular, the R is a diameter of a circumcircle of the first fluid-collecting tube  621  or a diameter of a circumcircle of the second fluid-collecting tube  622 . 
     Therefore, the distance between the first fluid-collecting tube  621  and the second fluid-collecting tube  622  may be set to be large, and the first fluid-collecting tube  621  may be easily welded to the heat exchanging body  61 , and the second fluid-collecting tube  622  may be easily welded to the heat exchanging body  61 . In addition, heat exchange is not performed between the second micro-channel  611 , which is disposed between the first fluid-collecting tube  621  and the second fluid-collecting tube  622 , and the first micro-channel  610 . When the distance between the first fluid-collecting tube  621  and the second fluid-collecting tube  622  is small, the length of the second micro-channel  611  disposed between the first fluid-collecting tube  621  and the second fluid-collecting tube  622  may be reduced, and the heat exchanging area of the second micro-channel  611  may be increased. 
     In some embodiments, the first fluid-collecting tube  621  and the second fluid-collecting tube  622  may be welded to reduce the distance between the first fluid-collecting tube  621  and the second fluid-collecting tube  622 . 
     In addition, the first micro-channel  610  may be connected to the first fluid-collecting tube  621  by avoiding the second fluid-collecting tube  622 . For example, the first micro-channel  610  may be arranged at an outside of the second fluid-collecting tube  622 , and the first micro-channel  610  may be connected to the first fluid-collecting tube  621  by avoiding the second fluid-collecting tube  622 . In some embodiments, the second micro-channel  611  may be connected to the second fluid-collecting tube  622  by avoiding the first fluid-collecting tube  621 . 
     1.3 Dividing Master Fluid-Collecting Tube Into Two Fluid-Collecting Tubes 
     As shown in  FIG.  5   , the manifold fluid-collecting tube assembly  62  includes a master fluid-collecting tube  623  and a flow divider  624 . The flow divider  624  is arranged inside the master fluid-collecting tube  623  for dividing the master fluid-collecting tube  623  into the first fluid-collecting tube  621  and the second fluid-collecting tube  622 . That is, the master fluid-collecting tube  623  is configured as the first fluid-collecting tube  621  and the second fluid-collecting tube  622  separated by the flow divider  624 . In this case, as shown in  FIG.  5   , the first micro-channel  610  extends through a side wall of the master fluid-collecting tube  623  and is inserted into the first fluid-collecting tube  621 , and the second micro-channel  611  extends through the side wall of the master fluid-collecting tube  623  and the flow divider  624  and is inserted into the second fluid-collecting tube  622 . In some embodiments, the second micro-channel  611  extends through the side wall of the master fluid-collecting tube  623  and is inserted into the second fluid-collecting tube  622 , and the first micro-channel  610  extends through the side wall of the master fluid-collecting tube  623  and the flow divider  624  and is inserted into the first fluid-collecting tube  621 . Compared to the fluid-collecting tube assembly  62  shown in  FIG.  4   , in the present embodiment, one master fluid-collecting tube  623  is arranged to achieve functions of both the first fluid-collecting tube  621  and the second fluid-collecting tube  622 , and costs and a size of the fluid-collecting tube assembly  62  may be reduced. 
     In some embodiments, the master fluid-collecting tube  623  is divided into two first fluid-collecting tubes  621  or two second fluid-collecting tubes  622  by the flow divider  624 . In this case, an end of the first micro-channel  610  extends through the side wall of the master fluid-collecting tube  623  and is inserted into one of the two first fluid-collecting tubes  621 , and the other end of the first micro-channel  610  extends through the side wall of the master fluid-collecting tube  623  and is inserted into the other one of the two first fluid-collecting tubes  621 . One of the two first fluid-collecting tubes  621  is configured to provide the first cooling medium to the first micro-channel  610 , and the other of the two first fluid-collecting tubes  621  is configured to collect the first cooling medium flow through the first micro-channel  610 . In this case, the first micro-channel  610  may have a U-shaped flowing path. 
     In some embodiments, an end of the second micro-channel  611  extends through the side wall of the master fluid-collecting tube  623  and is inserted into one of the two second fluid-collecting tubes  622 , and the other end of the second micro-channel  611  extends through the side wall of the master fluid-collecting tube  623  and the flow divider  624  and is inserted into the other one of the two second fluid-collecting tubes  622 . One of the two second fluid-collecting tubes  622  is configured to provide the second cooling medium to the second micro-channel  611 , and the other of the two second fluid-collecting tubes  622  is configured to collect the second cooling medium flowing through the second micro-channel  611 . In this case, the second micro-channel  611  may have a U-shaped flowing path. 
     1.4 First Fluid-Collecting Tube Sleeving or Being Sleeved by Second Fluid-Collecting Tube 
     As shown in  FIG.  6   , a diameter of the second fluid-collecting tube  622  is smaller than a diameter of the first fluid-collecting tube  621 . The first fluid-collecting tube  621  sleeves an outside of the second fluid-collecting tube  622 . The first micro-channel  610  extends through the side wall of the first fluid-collecting tube  621  and is inserted into the first fluid-collecting tube  621 . The second micro-channel  611  extends through the side wall of the first fluid-collecting tube  621  and the side wall of the second fluid-collecting tube  622  and is inserted into the second fluid-collecting tube  622 . In some embodiments, the second fluid-collecting tube  622  may sleeve an outside of the first fluid-collecting tube  621 . In this case, the second micro-channel  611  extends through the side wall of the second fluid-collecting tube  622  and is inserted into the second fluid-collecting tube  622 . The first micro-channel  610  extends through the side wall of the second fluid-collecting tube  622  and the side wall of the first fluid-collecting tube  621  and is inserted into the first fluid-collecting tube  621 . 
     Compared to the fluid-collecting tube assembly  62  shown in  FIG.  4   , in the present embodiment, the sleeving allows the size of the fluid-collecting tube assembly  62  to be reduced. 
     In some embodiments, the two first fluid-collecting tubes  621  may be sleeved within each other, or the two second fluid-collecting tubes  622  may be sleeved within each other. In this case, an end of the first micro-channel  610  extends through the side wall of an outer first fluid-collecting tube  621  and is inserted into the outer first fluid-collecting tube  621 . The other end of the first micro-channel  610  extends through the side wall inside the two first fluid-collecting tubes  621  and is inserted into an inner first fluid-collecting tube  621 . The outer first fluid-collecting tube  621  is configured to provide the first cooling medium to the first micro-channel  610 , and the inner first fluid-collecting tube  621  is configured to collect the first cooling medium flowing through the first micro-channel  610 . In one embodiment, the inner first fluid-collecting tube  621  is configured to provide the first cooling medium to the first micro-channel  610 , and the outer first fluid-collecting tube  621  is configured to collect the first cooling medium flowing through the first micro-channel  610 . In this case, the first micro-channel  610  may have a U-shaped flowing path. 
     In one embodiment, an end of the second micro-channel  611  extends through the side wall of an outer second fluid-collecting tube  622  and is inserted into the outer second fluid-collecting tube  622 . The other end of the second micro-channel  611  extends through the side wall inside the two second fluid-collecting tubes  622  and is inserted into an inner second fluid-collecting tube  622 . The outer second fluid-collecting tube  622  is configured to provide the second cooling medium to the second micro-channel  611 , and the inner second fluid-collecting tube  622  is configured to collect the second cooling medium flowing through the second micro-channel  611 . In one embodiment, the inner second fluid-collecting tube  622  is configured to provide the second cooling medium to the second micro-channel  611 , and the outer second fluid-collecting tube  622  is configured to collect the second cooling medium flowing through the second micro-channel  611 . In this case, the second micro-channel  611  may have a U-shaped flowing path. 
     2. Heat Exchanger Having Sleeved Tubes 
     As shown in  FIG.  7   , the heat exchanger  6  includes the heat exchanging body  61 . The heat exchanging body includes a first tube body  614  and a second tube body  615 , and the first tube body  614  and the second tube body  615  are sleeved within each other. The first tube body  614  defines first micro-channels  610 , and the second tube body  615  defines second micro-channels  611 . The first micro-channels  610  and the plurality of second micro-channels  611  may be identical to the micro-channels  612  shown in  FIG.  2   . Therefore, the length of the heat exchanging body  61  may be reduced, and the size of the heat exchanger  6  may be reduced. 
     The first micro-channels  610  of the first tube body  614  serve as first heat exchanging channels  610  of the heat exchanger  6 , and the plurality of second micro-channels  611  of the second tube body  615  serve as second heat exchanging channels  611  of the heat exchanger  6 . The extension direction of the first micro-channels  610  may be parallel to the extension direction of the second micro-channels  611 . For example, the extension direction of the first micro-channels  610  is the same as the extension direction of the second micro-channels  611   
     In the present embodiment, the first tube body  614  sleeves an outside of the second tube body  615 . An outer surface of the first tube body  614  is arranged with at least one flat surface  616  to form a heat exchanging contact surface of the first tube body  614 , as shown in  FIG.  8   . Heat dissipation elements or electronic elements may be arranged on the flat surface  616  for being easily arranged. In some embodiments, the second tube body  615  may sleeve an outer side of the first tube body  614 . 
     In the air conditioning system in  FIG.  1   , the first cooling medium flows through the plurality of first micro-channels  610 , and the second cooling medium flows through the plurality of second micro-channels  611 . The first cooling medium may be in the liquid phase, and the second cooling medium may be in the gas-liquid phase. While the second cooling medium is flowing along the plurality of second micro-channels  611 , the second cooling medium absorbs heat from the first cooling medium in the plurality of first micro-channels  610  and may be gasified to further sub-cool the first cooling medium. In some embodiments, the first cooling medium and the second cooling medium may be configured in other manners as described in the above. 
     Compared to the heat exchanger  6  in  FIG.  2   , in the present embodiment, the area of the cross section of the heat exchanging body  61  is increased, and a pressure loss of the cooling medium may be reduced. In addition, the first tube body  614  sleeves the outside of the second tube body  615 , the heat exchanging area of the plurality of first micro-channels  610  and the plurality of second micro-channels  611  may be increased, and the heat exchanging efficiency between the first heat exchanging channel  610  and the second heat exchanging channel  611  may be improved. 
     As shown in  FIG.  4   , the heat exchanger  6  may further include the fluid-collecting tube assembly  62 . The fluid-collecting tube assembly  62  may include a first fluid-collecting tube  621  and a second fluid-collecting tube  622 . The first fluid-collecting tube  621  has a first fluid-collecting channel, and the second fluid-collecting tube  622  has a second fluid-collecting channel. The cross section of the heat exchanger  6  may be I shaped. For example, the heat exchanger  6  has the cross section along the direction that the cooling medium flows in the heat exchanging body  61 , and the cross section may be I shaped. In some embodiments, the cross section may be L shaped, U shaped, G shaped, circular, and so on. 
     The first fluid-collecting channel is communicated with the first micro-channel  610 , and the first cooling medium may be provided to the plurality of first micro-channels  610  through the first fluid-collecting channel; and/or the first cooling medium that flows through the plurality of first micro-channels  610  may be collected. Two first fluid-collecting tubes  621  are arranged and are connected to two ends of the first tube body  614 , respectively. In this way, the first cooling medium may be provided to the plurality of first micro-channels  610  through one of the two first fluid-collecting tubes  621 , and the first cooling medium that flows through the plurality of first micro-channels  610  may be collected through the other one of the two first fluid-collecting tubes  621 . 
     The second fluid-collecting channel is communicated with the second micro-channel  611 , and the second cooling medium may be provided to the plurality of second micro-channels  611  through the second fluid-collecting channel; and/or the second cooling medium that flows through the plurality of second micro-channels  611  may be collected. Two second fluid-collecting tubes  622  are arranged and are connected to two ends of the second tube body  615  respectively. In this way, the second cooling medium may be provided to the plurality of second micro-channels  611  through one of the two second fluid-collecting tubes  622 , and the second cooling medium that flows through the plurality of second micro-channels  611  may be collected through the other one of the two second fluid-collecting tubes  622 . 
     In some embodiments, the heat exchanging body  61  may include at least two sets of first tube bodies  614  and second tube bodies  615 . One of the at least two sets of first tube bodies  614  and second tube bodies  615  may be spaced apart from another one of the at least two sets of first tube bodies  614  and second tube bodies  615  in a direction perpendicular to the extension direction. For example, the at least two sets of first tube bodies  614  and the second tube bodies  615  may include a first set of first tube bodies  614  and the second tube bodies  615  and a second set of first tube bodies  614  and the second tube bodies  615 . For the first set, the first tube bodies  614  and the second tube bodies  615  may be sleeved within each other. For the second set, the first tube bodies  614  and the second tube bodies  615  may be sleeved within each other. The first set of first tube bodies  614  and the second tube bodies  615  may be spaced apart from the second set of first tube bodies  614  and the second tube bodies  615 , in the direction perpendicular to the extension direction. 
     For the at least two sets of first tube bodies  614  and second tube bodies  615 , same ends of the first tube bodies  614  are connected to one first fluid-collecting tube  621 , and same ends of the second tube bodies  615  are connected to one second fluid-collecting tube  622 , and costs may be reduced. 
     The fluid-collecting tubes of the fluid-collecting tube assembly  62  may be configured in any one of the above-described manners. For example, as described in the above, the first fluid-collecting tube  621  is spaced apart from the second fluid-collecting tube  622 , the flow divider  624  is arranged inside the master fluid-collecting tube  623 , or the first fluid-collecting tube  621  and second fluid-collecting tube  622  are sleeved within each other. In this case, the first tube body  614 , the first micro-channel  610  arranged with the first tube body  614 , the second tube body  615 , and the second micro-channel  611  arranged with second tube body  615  may be engaged with the fluid-collecting tube in the above-mentioned manners, which will not be repeatedly described herein. 
     3. Heat Exchanger Having First Plate Body and Second Plate Body that are Laminated with Each Other 
     As shown in  FIG.  9   , the heat exchanger  6  includes a heat exchanging body  61 . The heat exchanging body  61  includes a first plate body  631  and a second plate body  632 , the first plate body  631  and the second plate body  632  are laminated with each other. 
     The first plate body  631  defines first micro-channels  610 , and the second plate body  632  defines second micro-channels  611 . The first micro-channels  610  and the plurality of second micro-channels  611  may be identical to the micro-channels  612  shown in  FIG.  2    and will not be repeated here. Therefore, the length of the heat exchanging body  61  may be reduced, and the size of the heat exchanger  6  may be reduced. 
     The first micro-channels  610  of the first plate body  631  serve as the first heat exchanging channels  610  of the heat exchanger  6 , and the plurality of second micro-channels  611  of the second plate body  632  serve as the second heat exchanging channels  611  of the heat exchanger  6 . The extension direction of the first micro-channels  610  is parallel to the extension direction of the second micro-channels  611 . For example, the extension direction of the first micro-channels  610  is the same as the extension direction of the second micro-channels  611 . 
     Since the first plate body  631  and the second plate body  632  are laminated with each other, a contact area between the first plate body  631  and the second plate body  632  is increased to increase the heat exchanging area between the first heat exchanging channel  610  and the second heat exchanging channel  611 , and the heat exchanging efficiency may be improved. 
     In the air conditioning system in  FIG.  1   , the first cooling medium flows through the plurality of first micro-channels  610 , and the second cooling medium flows through the plurality of second micro-channels  611 . The first cooling medium may be in the liquid phase, and the second cooling medium may be in the gas-liquid phase. While the second cooling medium is flowing along the plurality of second micro-channels  611 , the second cooling medium absorbs heat from the first cooling medium in the plurality of first micro-channels  610  and may be gasified to further sub-cool the first cooling medium. In some embodiments, the first cooling medium and the second cooling medium may be configured in other manners as described in the above. 
     In some embodiments, two first plate bodies  631  may be arranged, and the second plate body  632  may be clamped between the two first plate bodies  631 . For example, the first plate body  631 , the second plate body  632  and the first plate body  631  are arranged sequentially and are laminated. Since the second plate body  632  is clamped between the two first plate bodies  631 , the second cooling medium of the second plate body  632  simultaneously absorbs heat from the first cooling media of the two first plate bodies  631 , and the first cooling media of the two first plate bodies  631  may be sub-cooled. In addition, the heat dissipation elements or electronic elements may be arranged to be thermally connected to the first plate body  631 . For example, the heat dissipation elements or electronic elements may be arranged on a surface of the first plate body  631  away from the second plate body  632  to facilitate arrangement. In an embodiment, the two first plate bodies  631  may be two separated plates that are independent from each other. In some embodiments, the two first plate bodies  631  may be connected with each other to form an integral one-piece structure, in a U-shape. In this case, the first micro-channels  610  in the two first plate bodies  631  are communicated with each other in the U-shaped structure, and an inlet and an outlet of the first micro-channels  610  are located on a same side of the heat exchanging body  61 . 
     In some embodiments, two second plate bodies  632  may be arranged. The first plate body  631  may be clamped between the two second plate bodies  632 . In this case, the heat dissipation elements or the electronic elements may be arranged to be thermally connected to the second plate body  632 . 
     As shown in  FIG.  10   , the heat exchanger  6  may further include the fluid-collecting tube assembly  62 . The fluid-collecting tube assembly  62  may include a first fluid-collecting tube  621  and a second fluid-collecting tube  622 . The first fluid-collecting tube  621  has a first fluid-collecting channel, and the second fluid-collecting tube  622  has a second fluid-collecting channel. The heat exchanger  6  has the cross section along the direction that the cooling medium flows in the heat exchanging body  61 , and the cross section may be I shaped. In some embodiments, the cross section may be L shaped, U shaped, G shaped, circular, and so on. 
     The first fluid-collecting channel is communicated with the first micro-channel  610 , and the first cooling medium may be provided to the plurality of first micro-channels  610  through the first fluid-collecting channel; and/or the first cooling medium that flows through the plurality of first micro-channels  610  may be collected. Two first fluid-collecting tubes  621  are arranged and are connected to two ends of the first plate body  631 , respectively. In this way, the first cooling medium may be provided to the plurality of first micro-channels  610  through one of the two first fluid-collecting tubes  621 , and the first cooling medium that flows through the plurality of first micro-channels  610  may be collected through the other one of the two first fluid-collecting tubes  621 . 
     The second fluid-collecting channel is communicated with the second micro-channel  611 , and the second cooling medium may be provided to the plurality of second micro-channels  611  through the second fluid-collecting channel; and/or the second cooling medium that flows through the plurality of second micro-channels  611  may be collected. Two second fluid-collecting tubes  622  are arranged and are connected to two ends of the second plate body  632  respectively. In this way, the second cooling medium may be provided to the plurality of second micro-channels  611  through one of the two second fluid-collecting tubes  622 , and the second cooling medium that flows through the plurality of second micro-channels  611  may be collected through the other one of the two second fluid-collecting tubes  622 . 
     In some embodiments, the heat exchanging body  61  may include at least two sets of first plate bodies  631  and second plate bodies  632 . One set of the at least two sets of first plate bodies  631  and second plate bodies  632  may be spaced apart from another set of the at least two sets of first plate bodies  631  and second plate bodies  632  in a direction perpendicular to the extension direction. For example, as shown in  FIG.  10   , the heat exchanging body  61  includes three sets of first plate bodies  631  and the second plate bodies  632 . The three sets may be spaced apart from each other along the extension direction of the first micro-channel  610  or along the direction perpendicular to the extension direction of the second micro-channel  611 . 
     For the at least two sets of first plate bodies  631  and second plate bodies  632 , same ends of the first plate bodies  631  are connected to one first fluid-collecting tube  621 , and same ends of the second plate bodies  632  are connected to one second fluid-collecting tube  622 . For example, same ends of all first plate bodies  631  of the heat exchanging body  61  are connected to one first fluid-collecting tube  621 , and costs may be reduced. 
     In the present embodiment, the first fluid-collecting tube  621  is spaced apart from the second fluid-collecting tube  622 . The second plate body  632  extends through the first fluid-collecting tube  621  and is inserted into the second fluid-collecting tube  622 . The first fluid-collecting tube  621  is disposed between the second fluid-collecting tube  622  and the heat exchanging body  61 . The second plate body  632  extends through the first fluid-collecting tube  621  and is inserted into and welded with the second fluid-collecting tube  622 . The first plate body  631  is inserted into and welded with the first fluid-collecting tube  621 . In some embodiments, the first plate body  631  extends through the second fluid-collecting tube  622  to further connect to the first fluid-collecting tube  621 . 
     A distance between the first fluid-collecting tube  621  and the second fluid-collecting tube  622  is R-2R. The R is a maximum cross-sectional dimension of the first fluid-collecting tube  621  along a spacing direction of the first fluid-collecting tube  621  and the second fluid-collecting tube  622 . Each of the cross section of the first fluid-collecting tube  621  and the cross section of the second fluid-collecting tube  622  may be circular. The R may be a diameter of the first fluid-collecting tube  621  or a diameter of the second fluid-collecting tube  622 . Further, as described in the above, when the cross section of the first fluid-collecting tube  621  and the cross section of the second fluid-collecting tube  622  are not circular, the R is the diameter of the circumcircle of the first fluid-collecting tube  621  or the diameter of the circumcircle of the second fluid-collecting tube  622 . 
     The fluid-collecting tubes of the fluid-collecting tube assembly  62  may be configured in any one of the above-described manners. For example, as described in the above, the flow divider  624  is arranged inside the master fluid-collecting tube  623 , or the first fluid-collecting tube  621  and second fluid-collecting tube  622  are sleeved within each other. In this case, the first plate body  631 , the first micro-channel  610  arranged with the first plate body  631 , the second plate body  633 , and the second micro-channel  611  arranged with second plate body  632  may be engaged with the fluid-collecting tube in the above-mentioned manners, which will not be repeatedly described herein. 
     4. Heat Exchanger Serving as Heat Dissipation Member 
     In the present disclosure, the heat exchanger  6  described above may serve as a heat dissipation member (hereinafter described as the heat dissipation member  6 ). The heat dissipation member  6  includes a heat exchanging body  61  and a fluid-collecting tube assembly  62 . The heat dissipation member  6  is arranged on an electric control box  7  to dissipate heat from the electric control box  7  and electronic components  71  arranged inside the electric control box  7 . To be noted that, the heat dissipation member  6  referred herein shall include the various forms of heat exchangers as described in the above, and shall not be limited to one particular embodiment. 
     As shown in  FIG.  11   , the electric control box  7  may include a box body  72  and the electronic element  71 . The box body  72  defines a mounting cavity  721 , and the electronic element  71  is received in the mounting cavity  721 . The box body  72  is made of metal plate. The electronic element  71  in the mounting cavity  721  may be a compressor, a fan, a capacitor, an electric control and a common mode inductor. 
     As shown in  FIG.  11   , the box body  72  includes a top plate (not shown in the drawings, arranged opposite to a bottom plate  723  to cover an opening of the mounting cavity  721 ), a bottom plate  723 , and a circumferential side plate  724 . The top plate and the bottom plate  723  are opposite to each other. The circumferential side plate  724  is connected to the top plate and the bottom plate  723 , and the mounting cavity  721  is defined. 
     In detail, as shown in  FIG.  11   , the bottom plate  723  and the top plate are rectangular. 
     Four circumferential side plates  724  may be arranged. Each of the four circumferential side plates  724  are connected to a corresponding side of the bottom plate  723  and a corresponding side of the top plate, and the four circumferential side plates  724 , the bottom plate  723  and the top plate cooperatively form the rectangular electric control box  7 . A length of a long side of the bottom plate  723  is a length of the electric control box  7 , and a length of a short side of the bottom plate  723  is a width of the electric control box  7 . A height of the circumferential side plate  724  perpendicular to the bottom plate  723  is a height of the electric control box  7 . As shown in  FIG.  11   , the length of the electric control box  7  in an X direction is the length of the electric control box  7 , the length of the electric control box  7  in a Y direction is the height of the electric control box  7 , and the length of the electric control box  7  in a Z direction is the width of the electric control box  7 . 
     In some embodiments, a shape of the bottom plate  723  and a shape of the top plate of the box body  72  may be circular, trapezoidal, triangular, and so on. The circumferential side plates  724  are arranged around an outer circumference of the bottom plate  723  to form any shape of the electric control box  7 . The shape of the electric control box  7  may be determined based on the demands, and will not be limited by the present disclosure. 
     Detailed engagement between the heat dissipation member  6  and the electric control box  7  will be described in the following embodiments. 
     5. Heat Exchanging Body Being L Shaped and U Shaped 
     Usually, the heat exchanging body  61  is straight, as shown in  FIG.  10   , the heat exchanging body  61  has an overall length, an overall width and an overall height. The overall length is the length of the heat exchanging body  61  in the extension direction, i.e., the length of the heat exchanging body  61  along the X direction shown in  FIG.  10   . The overall width is the length of the heat exchanging body  61  in a direction perpendicular to the extension direction and perpendicular to a plane where the heat exchanging body  61  is disposed, i.e., the length of the heat exchanging body  61  along the Y direction shown in  FIG.  10   . The overall height is the length of the heat exchanging body  61  in the Z direction shown in  FIG.  10   . 
     The plane where the heat exchanging body  61  is disposed refers to a plane and the fluid-collecting tube assembly  62  is disposed, i.e., the plane XOZ shown in  FIG.  10   . 
     In order to ensure the heat exchanging effect of the heat dissipation member  6 , when a size of the cross section of the heat dissipation member  6  remains unchanged, the extension length of the heat exchanging body  61  needs to be increased to increase the heat exchanging area, and the heat exchanging effect may be improved. When the heat exchanging body  61  is configured as a straight strip, the overall length of the heat exchanging body  61  may be large, a size of the electric control box  7 , which is engaged with the heat dissipation member  6 , may be large, and the electric control box  7  may not be configured to be miniaturized. 
     Therefore, as shown in  FIG.  11    and  FIG.  12   , in order to reduce the overall length of the heat exchanging body  61 , the heat exchanging body  61  may be configured as including a first extension portion  617  and a second extension portion  618 . The second extension portion  618  is connected to an end of the first extension portion  617  and is bent towards a side of the first extension portion  617 . 
     In the present embodiment, the heat exchanging body  61  is bent, and the first extension portion  617  is connected to and bent towards the second extension portion  618 . In this way, the heat exchanging body  61  has a sufficient extension length, but the overall length of the heat exchanging body  61  may be reduced. Therefore, the length of the electric control box  7 , which is engaged with the heat dissipation member  6 , in the X direction may be reduced, and the size of the electric control box  7  may be reduced. 
     In the present embodiment, as shown in  FIG.  11    and  FIG.  12   , the heat exchanging body  61  may be arranged on the bottom plate  723  of the electric control box  7 . 
     In detail, the first extension portion  617  may be parallel to the bottom plate  723 , and the length of the bottom plate  723  in the length direction may be fully applied to allow the length of the heat exchanging body  61  to be maximized, improving the heat exchanging effect. The second extension portion  618  may be parallel to the circumferential side plate  724  in order to reduce a space occupied by the second extension portion  618  in the X direction. 
     In some embodiments, the first extension portion  617  may abut against or may be spaced apart from the bottom plate  723 . The second extension portion  618  may abut against or may be spaced apart from the circumferential side plate  724 . The present disclosure does not limit the relative positions between the extension portions and the plates. 
     In some embodiments, the heat exchanging body  61  may be arranged on the circumferential side plate  724  of the electric control box  7 . In detail, the first extension portion  617  may be parallel to one of the four circumferential side plates  724 , and the second extension portion  618  may be parallel to another one of the four circumferential side plates  724 , and the another one of the four circumferential side plates  724  may be adjacent to the one circumferential side plate  724  parallel to the first extension portion  617 . In this way, the heat dissipation member  6  may be arranged on one side of the mounting cavity  721 . 
     In some embodiments, the heat exchanging body  61  may be fixed at other positions of the electric control box  7  based on the arrangement of the electronic elements  71 , and so on. The present disclosure does not limit a position where the heat exchanging body  61  shall be arranged. 
     Further, as shown in  FIG.  12   , more than one second extension portions  618  may be arranged. One of the more than one second extension portions  618  may be connected to one of two ends of the first extension portion  617 , and the heat exchanging body  61  may be L-shaped. 
     As shown in  FIG.  12   , two second extension portions  618  may be arranged. The two second extension portions  618  may be connected to two ends of the first extension portion  617 , respectively, and may be bent towards a same side of the first extension portion  617 . 
     In detail, the two second extension portions  618  may be parallel to each other and may be spaced apart from each other, and the two second extension portions  618  may be arranged at opposite ends of the first extension portion  617 , and the overall length of the heat exchanging body  61  may be reduced but the heat exchanging effect of the heat exchanging body  61  may be maintained, and a size of the heat dissipation member  6  may be reduced. In addition, by contrast to arranging the two second extension portion  618  on opposite sides of the first extension portion  617 , in the present embodiment, the two second extension portions  618  may be bent and arranged on a same side of the first extension portion  617 , and the overall width of the heat dissipation member  6  may be reduced. 
     Further, the two second extension portions  618  may be perpendicular to the first extension portion  617  to form a U-shaped heat exchanging body  61 . In this way, the overall length of the heat exchanging body  61  may be reduced, and a space occupied by the second extension portions  618  in the X direction may be reduced, and the two second extension portions  618  may not interfere with the electronic elements  71  arranged inside the mounting cavity  721 . 
     In some embodiments, the two second extension portions  618  may be inclined relative to the first extension portion  617 , an angle that one of the two second extension portions  618  is inclined relative to the first extension portion  617  may be different from another angle that the other one of the two second extension portions  618  is inclined relative to the first extension portion  617 . In this way, the overall width of the electric control box  7  may be reduced. 
     Further, an extension length of the first extension portion  617  may be greater than an extension length of the second extension  618 , and the first extension portion  617  may be arranged along the length of the electric control box  7 , and the second extension portion  618  may be arranged along the width or the height of the electric control box  7 . 
     Further, as shown in  FIG.  11   , one heat dissipation member  6  may be received in the mounting cavity  721 . The one heat dissipation member  6  may be received in the mounting cavity  721  extending along the length of the box body  72 . In some embodiments, the one heat dissipation member  6  may be received in the mounting cavity  721  extending along the height of the box body  72 . 
     In some embodiments, at least two heat dissipation members  6  may be received in the mounting cavity  721 . For example, the number of heat dissipation members  6  may be two, three, four, five, and so on. By arranging a larger number of heat dissipation members  6 , the heat dissipation effect of the electric control box  7  may be improved. 
     In detail, two heat dissipation members  6  may be received in the mounting cavity  721 . Two heat exchanging bodies  61  of the two heat dissipation members  6  may be L-shaped. The two heat dissipation members  6  may be spaced apart from each other along the length direction (X direction) of the electric control box  7 . That is, the first extension portion  617  of one of the two heat dissipation members  6  may be spaced apart from the first extension portion  617  of the other one of the two heat dissipation members  6 , along the length direction (X direction) of the electric control box  7 . For one of the two heat dissipation members  6 , the second extension portions  618  may be disposed on a side of the first extension portion  617  away from the first extension portion  617  of the other one of the two heat dissipation members  6 . In this way, the two heat dissipation members  6  may not interfere with the electronic elements  71  received in the mounting cavity  721 . 
     In some embodiments, the two heat dissipation members  6  may be arranged side by side and spaced apart from each other along the width direction (Z direction) of the electric control box  7 . That is, the first extension portion  617  of each of the two heat dissipation members  6  extends along the length direction (X direction) of the electric control box  7 , and the first extension portion  617  of one of the two heat dissipation members  6  and the first extension portion  617  of the other one of the two heat dissipation members  6  may be arranged side by side and may be spaced apart from each other. For each of the two heat dissipation members  6 , the second extension portions  618  may be disposed on a same side or on different sides of the corresponding first extension portion  617 . 
     5.1 Fixing Bracket 
     In the art, since the economizer arranged inside the electric control box  7  may be large in size and may have an irregular shape, a fixing structure of the economizer may be complicated and may not be assembled efficiently. In the present disclosure, the heat dissipation member  6  may be plate shaped, and the heat dissipation member  6  may be assembled and fixed easily, improving the assembling efficiency. 
     In the present embodiment, as shown in  FIG.  14   , the electric control box  7  may include a fixing bracket  73 , and the fixing bracket  73  may be connected between the heat exchanging body  61  and the box body  72  to enable the heat exchanging body  61  to be fixedly arranged inside the electric control box  7 . 
     In the present embodiments, the fixing bracket  73  may be connected between the first extension portion  617  and the circumferential side plate  724 . In one embodiment, the fixing bracket  73  may be connected between the second extension portion  618  and the circumferential side plate  724 . Connection structures of the above two arrangements may substantially be the same. In the following, the fixing bracket  73  being connected between the first extension portion  617  and the circumferential side plate  724  may be taken as an example to illustrate the connection structure of the heat exchanging body  61  and the box body  72 . 
     As shown in  FIG.  14   , the fixing bracket  73  may include a first fixing portion  731  and a second fixing p portion art  732 . The first fixing portion  731  may bend towards the second fixing p portion art  732 . The first fixing portion  731  may be welded to the first extension portion  617 , and the second fixing portion  732  may be fastened to the circumferential side plate  724 . 
     In detail, the first fixing portion  731  may be welded to one of main surfaces of the heat exchanging body  61  to increase a welding area between the fixing bracket  73  and the heat exchanging body  61 , improving a welding strength. By welding the first fixing portion  731  to the first extension portion  617 , the first extension portion  617  may not need to define any hole, and the micro-channels defined in the heat exchanging body  61  may not be interrupted. The second fixing portion  732  may be connected to the circumferential side plate  724  by screws, snaps or glue, and the heat dissipation member  6  may be maintained or replaced easily. 
     The main surface of the heat exchanging body  61  refers to a surface of the heat exchanging body  61  having a large area. In this embodiment, as shown in  FIG.  10   , the main surface of the heat exchanging body  61  refers to a surface parallel to the XOZ plane. 
     In some embodiments, as shown in  FIG.  14   , the second fixing portion  732  is connected vertically to the first fixing portion  731 , and an L-shaped fixing bracket  73  may be formed. By connecting the first fixing portion  731  vertically to the second fixing portion  732 , forces applied to the fixing bracket  73  may be evenly distributed on the fixing bracket  73 . 
     In one embodiment, as shown in  FIG.  15   , the fixing bracket  73  may include a first fixed portion  731 , a second fixed portion  732  and a third fixed portion  733 . The first fixed portion  731 , a second fixed portion  732  and a third fixed portion  733  may be connected with each other, and a connection part between any two of the portions may be bent. The first fixed portion  731  and the third fixed portion  733  may be spaced apart from each other and connected to the bottom plate  723 . The second fixed portion  732  and the bottom plate  723  may be spaced apart from each other to cooperatively define a clamping slot  734 . The first extension portion  617  may be welded to a side of the second fixed portion  732  away from the clamping slot  734 . In this case, the heat exchanging body  61  may be spaced apart from the bottom plate  723 , and the contact between the heat exchanging body  61  and the electric control box  7  may be interrupted, heat exchanging between the heat exchanging body  61  and the electric control box  7  may be avoided, and the heat dissipation efficiency of the heat dissipation member  6  may not be reduced. 
     In detail, the first fixed portion  731  and the third fixed portion  733  may be bent towards and connected to opposite ends of the second fixed portion  732  and may be disposed on a same side of the second fixed portion  732 , and a clamping slot  734  in a C shape may be defined. An end of the first fixed portion  731  away from the second fixed portion  732  and an end of the third fixed portion  733  away from the second fixed portion  732  may be connected to the bottom plate  723 . The connection manner between the second fixing portion  732  and the heat exchanging body  61  may be the same as and may be referred to the embodiments described in the above. The connection manner that the first fixing portion  731  and the third fixing portion  733  are connected to the bottom plate  723  may be the same as and may be referred to the embodiments described in the above. The connection manners will not be repeated herein. 
     In some embodiments, the first extension portion  617  may be clamped in the clamping slot  734 . The first extension portion  617  may abut against the bottom plate  723  and the second fixing portion  732  on two opposite sides along the overall width direction of the heat exchanging body  61 . The first extension portion  617  may abut against the first fixing portion  731  and the third fixing portion  733  on two opposite sides along the overall height direction of the heat exchanging body  61 . In this way, the first extension portion  617  may be fixed. The heat exchanging body  61  may be fixed by being clamped, and the heat exchanging body  61  may not be damaged, and the heat exchanging body  61  may be easily repaired or replaced. 
     The above-mentioned fixing brackets may be applied to fix the heat dissipation members in any forms as disclosed herein, and a position and the heat dissipation member is fixed may not be limited herein. 
     5.2 Heat Dissipation Member Arranged Inside Electric Control Box 
     Further as shown in  FIG.  11   , the heat dissipation member  6  is received in the mounting cavity  721  of the electric control box  7 . In detail, the heat dissipation member  6  may be thermal-conductively connected to the electronic element  71  received in the mounting cavity  721  to dissipate heat from the electronic element  71 . 
     In detail, as described in the embodiments of  FIG.  11   , the electronic element  71  may be thermal-conductively connected to the first extension portion  617  and/or the second extension portion  618 . The heat dissipation members in any forms as disclosed herein may be received inside the mounting cavity  721  of the electric control box  7  or applied to dissipate heat from the electric control box  7 , and may be directly or indirectly thermal-conductively connected to the electronic element  71 . 
     When the heat dissipation member  6  is received in the mounting cavity  721 , in the embodiment shown in  FIG.  11   , the electronic element  71  may be thermal-conductively connected to the first extension portion  617 . The electronic element  71  and the second extension portion  618  may be arranged on a same side of the first extension portion  617 , and the height of the electric control box  7 , i.e., a size along the Y direction, may be reduced, 
     In some embodiments, the electronic element  71  may be thermal-conductively connected to the second extension portion  618 , and may be arranged on a side of the second extension portion  618  facing towards the first extension portion  617 , and the length of the electric control box  7 , i.e., a size along the X direction, may be reduced. 
     In some embodiments, a part of the electronic element  71  may be arranged on the first extension portion  617 , and another part of the electronic element  71  may be arranged on the second extension portion  618 , and the electronic element  71  may be evenly distributed. 
     Since the number of electronic elements  71  may be large, connecting each of the large number of the electronic elements  71  to the heat exchanging body  61  may cause the electronic elements  71  to be mounted in a complicated manner, and the mounting efficiency may be low. 
     Therefore, as shown in  FIG.  11    and  FIG.  16   , a heat dissipation fixing plate  74  may be arranged inside the electric control box  7 . The electronic elements  71  may be arranged on the heat dissipation fixing plate  74 . Further, the heat dissipation fixing plate  74  may be arranged on the heat exchanging body  61 , and the electronic elements  71  may be thermal-conductively connected to the heat exchanging body  61  through the heat dissipation fixing plate  74 . In this way, the efficiency of mounting the electronic elements  71  may be greatly improved. 
     In detail, the heat dissipation fixing plate  74  may be arranged on the first extension portion  617  and/or the second extension portion  618 , and the electronic elements  71  may be arranged on a side of the heat dissipation fixing plate  74  away from the first extension portion  617  and/or the second extension portion  618 . 
     Further, the heat dissipation fixing plate  74  may be arranged on the main surface of the heat exchanging body  61  to increase the contact area between the heat dissipation fixing plate  74  and the heat exchanging body  61 , and the heat exchanging efficiency may be improved. In one embodiment, the main surface of the heat exchanging body  61  may provide a larger support surface for the heat dissipation fixing plate  74 , and therefore, the electronic elements  71  may be arranged more stably. 
     The heat dissipation fixing plate  74  may be made of metal or alloy having better thermal conductivity. For example, the heat dissipation fixing plate  74  may be made of aluminum, copper, aluminum alloy, and so on, to enhance the efficiency of heat conductivity. 
     In some embodiments, as shown in  FIG.  17   , the heat pipe  741  may be embedded in the heat dissipation fixing plate  74 . The heat pipe  741  may be configured to rapidly conduct heat from a concentrated high-density heat source to the entire surface of the heat dissipation fixing plate  74 , and the heat may be evenly distributed on the heat dissipation fixing plate  74 , and the heat exchanging effect between the heat dissipation fixing plate  74  and the heat exchanging body  61  may be enhanced. 
     As shown in the upper portion of  FIG.  17   , the heat pipe  741  may be long-strip shaped. Heat pipes  741  may be arranged. The heat pipes  741  may be arranged in parallel and spaced apart from each other. In one embodiment, as shown in the lower portion of  FIG.  17   , the plurality of heat pipes  741  may be connected successively to each other to form a square or a frame, which will not be limited by the present application. 
     5.3 Heat Dissipation Member Arranged Out of Electric Control Box 
     As shown in  FIG.  18   , the heat dissipation member  6  may be arranged on an outside of the electric control box  7 . The box body  72  of the electric control box  7  may define an assembly port  726 , and the electronic elements  71  may be thermal-conductively connected to the heat dissipation member  6  through the assembly port  726 . 
     In detail, as shown in  FIG.  18   , the heat dissipation fixing plate  74  may be connected to the heat dissipation member  6  and cover the assembly port  726 . The electronic elements  71  may be arranged on a surface of the heat dissipation fixing plate  74  away from the heat dissipation member  6 . 
     In some embodiments, as shown in  FIG.  19   , the heat pipe  741  may be arranged to enable the electronic elements  71  to be thermal-conductively connected to the heat dissipation member  6 . For example, the heat pipe  741  may include a heat absorbing end  741   a  and a heat releasing end  741   b . The heat absorbing end  741   a  of the heat pipe  741  may be inserted inside the mounting cavity  721  and thermal-conductively connected to the electronic elements  71  to absorb heat from the electronic elements  71 . The heat releasing end  741   b  of the heat pipe  741  may be arranged on the outside of the electric control box  7  and thermal-conductively connected to the heat dissipation member  6 , taking the heat dissipation member  6  to dissipate heat from the heat releasing end  741   b  of the heat pipe  741 . 
     5.4 Heat Dissipation Fin 
     A large amount of heat may be generated while the electronic elements  71  are operating, and the electric control box  7  may be relatively sealed. When the heat in the electric control box  7  cannot be released in time, a temperature in the mounting cavity  721  of the electric control box  7  may be high. Therefore, the electronic elements  71  may be damaged. Although the cooling medium flowing in the heat dissipation member  6  arranged inside the mounting cavity  721  may take away some of the heat, the heat dissipation performance of the electric control box  7  may still be poor. 
     Therefore, as shown in  FIG.  11    and  FIG.  20   , a heat dissipation fin  75  may be arranged inside the electric control box  7 . The heat dissipation fin  75  may be thermal-conductively connected to the heat exchanging body  61 , and the contact area between the heat exchanging body  61  and the air in the electric control box  7  may be increased due to the heat dissipation fin  75 , heat exchanging with the air may be improved, the temperature in the mounting cavity  721  may be reduced, and the electric elements  71  may be protected. 
     In some embodiments, one of the electronic element  71  and the heat dissipation fin  75  may be arranged on the first extension portion  617 , and the other one of the electronic element  71  and the heat dissipation fin  75  may be arranged on the second extension portion  618 , and the electronic element  71  may be misaligned with the heat dissipation fin  75 , and the electronic element  71  may not be interfered by the heat dissipation fin  75 . Further, the distance between the electronic element  71  and the heat dissipation fin  75  may be large, and the temperature of the cooling medium that contacts the heat dissipation fin  75  and the electronic element  71  may be low, and the heat dissipation effect of the heat exchanging body  61  may be improved. 
     Further, as shown in  FIG.  20   , one heat dissipation fin  75  may be arranged. A size of the heat dissipation fin  75  in the overall height direction of the heat exchanging body  61  may be greater than the overall height of the heat exchanging body  61 . The heat dissipation fin  75  may be connected to the surface of the heat exchanging body  61  by welding, bonding or fastening. A smaller number of heat dissipation fins  75  may be arranged, and the arranged heat dissipation fin  75  may have a large surface area. On one hand, the heat dissipation fin  75  may be easily connected to the heat exchanging body  61 , improving the efficiency of arranging the heat dissipation fin  75  and the heat exchanging body  61 . On another hand, the contact area between the heat dissipation fin  75  and the air may be increased, improving the heat exchanging effect. 
     As shown in  FIG.  21   , heat dissipation fins  75  may be arranged. A size of each of the plurality of heat dissipation fins  75  along the overall height direction of the heat exchanging body  61  may be equal to a size of each plate body along the overall height direction of the heat exchanging body  61 . Each of the plurality of heat dissipation fins  75  may be attached to one plate body. The heat dissipation fins  75  may be spaced apart from each other and arranged along the overall height direction of the heat exchanging body  61 , and the contact area of the heat dissipation fins  75  and the air may be increased. Since the plurality of heat dissipation fins  75  are arranged and are spaced apart from each other, the heat exchanging efficiency of the heat dissipation fins  75  may be ensured, manufacturing materials may be saved, and production costs may be reduced. 
     In some embodiments, the heat dissipation fin  75  may be extended to the outside of the electric control box. For example, the assembly port may be defined in the box body  72 , the heat exchanging body  61  may be arranged inside the box body  72  and thermal-conductively connected to the electronic elements  71 . A side of the heat dissipation fin  75  may be thermal-conductively connected to the heat exchanging body  61  and extends to the outside of the box body  72  through the assembly port, and air cooling may be applied to improve the heat dissipation effect of the heat exchanging body  61 . 
     Heat dissipation fin may be applicable to the heat exchangers in any forms as described herein, and shall not be limited to a particular embodiment. 
     6. G-Shaped Heat Exchanging Body and Engagement Between Exchanging Body and Electronic Elements 
     As shown in  FIG.  22   , in the present embodiment, the structure of the heat dissipation member  6  is substantially the same as that of the heat dissipation member  6  in the above embodiments. Further, in the present embodiment, the heat dissipation member  6  further includes a third extension portion  619 . The first extension portion  617  and the third extension portion  619  are arranged side by side and are spaced apart from each other. The second extension portion  618  is connected between an end of the first extension portion  617  and an end of the third extension portion  619  adjacent to the end of the first extension portion  617 . 
     In detail, the third extension portion  619  is connected to an end of the second extension portion  618  away from the first extension portion  617  and is bent towards a side of the second extension portion  618  facing towards the first extension portion  617 , and the third extension portion  619  may be spaced apart from the first extension portion  617 . In this way, while the extended length of the heat exchanging body  61  remains unchanged, the overall length and the overall width of the heat exchanging body  61  may be reduced to further reduce the size of the electric control box  7  that is engaged with the heat dissipation member  6 . 
     In some embodiments, as shown in  FIG.  22   , two second extension portions  618  are arranged. The two second extension portions  618  are bent towards and connected to two opposite ends of the first extension portion  617 . One third extension portion  619  is arranged. The third extension portion  619  is arranged at an end of one of the two second extension portions  618  away from the first extension portion  617  and is towards the other one of the two second extension portions  618 , and a G-shaped heat exchanging body  61  is formed. 
     In some embodiments, two second extension portions  618  are arranged. One of the two second extension portions  618  is bent towards and connected to one of two ends of the first extension portion  617 . One third extension portion  619  is arranged. The third extension portion  619  is arranged at an end of the second extension portion  618  away from the first extension portion  617  and is bent towards the first extension portion  617 . 
     In some embodiments, two second extension portions  618  are arranged. The two second extension portions  618  are bent towards and connected to two opposite ends of the first extension portion  617 . Two third extension portions  619  are arranged. The two third extension portions  619  are connected to ends of the two second extension portions  618  away from the first extension portion  617  and are extending towards each other, and the overall length of the heat exchanging body  61  may further be reduced. 
     Further, the third extension portion  619  may be spaced apart from and parallel to the first extension portion  617 , to avoid the third extension portion  619  from increasing the overall width of the heat exchanging body  61 . Further, the electronic components  71  may be disposed between the third extension portion  619  and the first extension portion  617 , the internal space of the electric control box  7  may be optimally utilized. 
     In detail, the electronic elements  71  may be arranged on and thermal-conductively connected to the first extension portion  617 . Further, the electronic elements  71  may be disposed between the first extension portion  617  and the third extension portion  619 . In one embodiment, the electronic elements  71  may be arranged on and thermal-conductively connected to the third extension portion  619 . Further, the electronic elements  71  may be disposed between the first extension portion  617  and the third extension portion  619 . 
     Since the electronic elements  71  are disposed between the first extension portion  617  and the third extension portion  619 , the space between the first extension portion  617  and the third extension portion  619  may be optimally utilized, the structure of the electronic elements  71  and the heat exchanging body  61  may be configured to be more compact. In one embodiment, the electronic elements  71  may be arranged on both the first extension portion  617  and the third extension portion  619 , and the electronic elements  71  may be thermal-conductively connected to both the first extension portion  617  and the third extension portion  619 . In this way, the heat exchange between the heat dissipation member  6  and the electronic elements  71  may further be improved, improving the efficiency of dissipating heat from the electronic elements  71 . 
     Further, there are various types of electronic elements  71 . The electronic elements  71  may be classified as elements that are prone to have failures and elements that are not prone to have failures, based on frequencies that the elements have failures while being used. Since the space between the first extension portion  617  and the third extension portion  619  is limited, the electronic elements  71  may not be easily disassembled. Therefore, in the present embodiment, the electronic elements  71  that are not prone to have failure may be disposed between the first extension portion  617  and the third extension portion  619 , reduce the chances of repairing the electronic elements  71 . 
     Further, the heat dissipation fixing plate  74  may be fixed to the third extension portion  619  in addition to the first extension portion  617  and/or the second extension portion  618  in the manner as described in the above embodiments. 
     In detail, the heat dissipation fixing plate  74  may be arranged on a side of the third extension portion  619  facing towards the first extension portion  617 , and the electronic elements  71  may be arranged on a side of the heat dissipation fixing plate  74  facing towards the first extension portion  617 . In this way, the structure of the electronic elements  71  and the heat exchanging body  61  may be more compact, the internal space of the electric control box  7  may not be excessively occupied. 
     Similarly, in the present embodiment, the heat dissipation fin  75  may be fixed to the third extension portion  619  in addition to the first extension portion  617  and/or the second extension portion  618  in the manner as described in the above embodiments. 
     In detail, one of the heat dissipation fin  75  and the electronic elements  71  may be arranged on the first extension portion  617 , and the other one of the heat dissipation fin  75  and the electronic elements  71  may be arranged on the second extension portion  618  and/or the third extension portion  619 , and the heat dissipation fin  75  may be misaligned with the electronic elements  71 . 
     In some embodiments, one heat dissipation fin  75  may be arranged. The heat dissipation fin  75  may be arranged on the second extension portion  618  or the third extension portion  619 . In one embodiment, two heat dissipation fins  75  may be arranged. The two heat dissipation fins  75  may be arranged on the second extension portion  618  and the third extension portion  619  respectively. In this way, the contact area between the heat dissipation fins  75  and the air may be increased, improving the heat dissipation effect of the heat dissipation member  6 . 
     7. Heat Dissipation Plate Arranged at Position of Heat Dissipation Member Having High Temperature 
     As shown in  FIG.  23   , in the present embodiment, the electric control box  7  may include a box body  72 , a heat dissipation member  6  and an electronic element  71 . The box body  72  defines a mounting cavity  721 . At a part of the heat dissipation member  6  is received in the mounting cavity  721 , and the electronic element  71  is received in the mounting cavity  721 . The structure of the box body  72  and the heat dissipation member  6  is substantially the same as the above-mentioned embodiments, and may be referred to the description of the above-mentioned embodiments. 
     In some embodiments, the heat exchanging body  61  may be entirely received inside the mounting cavity  721  of the electric control box  7 . In one embodiment, a part of the heat exchanging body  61  may be received inside the mounting cavity  721  of the electric control box  7 , and another part of the heat exchanging body  61  may be protruding out of the electric control box  7  to connect to an external tube of the fluid-collecting tube assembly  62 . 
     Flowing of the cooling medium may allow a temperature of the heat dissipation member  6  to be low. The electronic elements  71  in the electric control box  7  may generate heat to increase the temperature of the mounting cavity  721  of the electric control box  7 . When the high temperature air in the electric control box  7  contacts the heat dissipation member  6 , condensation may occur, and water may be generated on a surface of the heat dissipation member  6 . When the generated condensed water flows to the positions of the electronic elements  71  are arranged, the electronic elements  71  may be short-circuited or damaged, or more seriously, fire may be caused. 
     Therefore, as shown in  FIG.  23   , the heat exchanging body  61  may include a first end  61   a  and a second end  61   b  along a flowing direction of the cooling medium. A temperature of the heat exchanging body  61  is gradually reduced in a direction from the first end  61   a  to the second end  61   b . That is, a temperature of the first end  61   a  is higher than a temperature of the second end  61   b . The electronic elements  71  are arranged at positions near the first end  61   a  and are thermal-conductively connected to the heat exchanging body  61 . To be noted that, since the heat exchanging body  61  needs to exchange heat with the internal environment of the electric control box  7  or with the elements inside the electric control box  7 , the temperature of the heat exchanging body  61  as described in the above and in the following refers to a temperature of the surface of the heat exchanging body  61 . In detail, a change in the temperature of the surface of the heat exchanging body  61  is determined by the heat exchanging channels adjacent to the surface. For example, when the heat exchanging channel adjacent to the surface of the heat exchanging body  61  is the primary channel, heat of the cooling medium in the primary channel is continuously absorbed by the cooling medium in the secondary channel as the cooling media are flowing, the temperature of the surface of the heat exchanging body  61  gradually decreases along the flowing direction of the cooling medium in the primary channel. In this case, the first end  61   a  is located at an upstream of the second end  61   b  along the flowing direction of the cooling medium in the primary channel. When the surface of the heat exchanging body  61  is adjacent to the secondary channel, the temperature of the surface of the heat exchanging body  61  gradually increases along the flowing direction of the cooling medium in the secondary channel. In this case, the first end  61   a  is located at a downstream of the second end  61   b  along the flowing direction of the cooling medium in the secondary channel. 
     Therefore, the heat exchanging body  61  may be divided into the first end  61   a  having the higher temperature and the second end  61   b  having the lower temperature based on the change in temperature of the heat exchanging body  61 . Since a temperature difference between the first end  61   a  having the higher temperature and the hot air may be small, no condensed water or a less volume of condensed water may be generated. The electronic elements  71  may be arranged at positions near the first end  61   a , and therefore, chances that the electronic elements  71  contact the condensed water may be reduced, and the electronic elements  71  may be protected. 
     To be noted that, since the air conditioner usually has the refrigerating mode and the heating mode, and in these two modes, the cooling media may flow in opposite directions. In this case, temperature changing trends from the first end  61   a  of the heat exchanging body  61  to the second end  61   b  of the heat exchanging body  61  may be opposite. That is, in one mode, the temperature of the heat exchanging body  61  gradually decreases from the first end  61   a  to the second end  61   b , and in the other mode, the temperature of the heat exchanging body  61  gradually increases from the first end  61   a  to the second end  61   b . In the present embodiment, the priority is given to the refrigerating mode, ensuing the temperature of the heat exchanging body  61  gradually decreases from the first end  61   a  to the second end  61   b . Reasons will be explained in the following. 
     When an ambient temperature is low, for example, when the air conditioning apparatus is operating to heating the environment in winter, the temperature of the air inside the electric control box  7  is low. In this case, the temperature difference between the air inside the electric control box  7  and the heat dissipation member  6  is small, and the air may not be easily condensed to form condensed water. When the ambient temperature is high, for example, when the air conditioning apparatus is operating to cool the environment in summer, the temperature of the air in the electric control box  7  is high, and the temperature difference between the air in the electric control box  7  and the heat dissipation member  6  is high. The air may be easily condensed to form the condensed water. Therefore, in the present embodiment, at least in the refrigerating mode, the temperature of the heat exchanging body  61  gradually decreases in the direction from the first end  61   a  to the second end  61   b  , and the condensed water may not be generated on the heat exchanging body  61  while the apparatus is operating in the refrigerating mode. 
     Further, arranging the electronic element  71  at a position near the first end  61   a  means that a position where the electronic element  71  is thermal-conductively connected to the heat exchanging body  61  may be in a first distance away from the first end  61   a  and may be in a second distance away from the second end  61   b . The first distance is less than the second distance. 
     In detail, since the temperature of the heat exchanging body  61  gradually decreases in the direction from the first end  61   a  to the second end  61   b , the first end  61   a  has a highest temperature, and the second end  61   b  has a lowest temperature. The higher the temperature of the heat exchanging body  61 , the smaller the temperature difference between the heat exchanging body  61  and the air inside the electric control box  7 , and the condensed water is less likely to be generated. The lower the temperature of the heat exchanging body  61 , the greater the temperature difference between the heat exchanging body  61  and the hot air, and the condensed water is more likely to be generated. In other words, the chance of generating the condensed water gradually increases in the direction from the first end  61   a  to the second end  61   b  of the heat exchanging body  61 . Therefore, the electronic element  71  is arranged near the higher temperature end of the heat exchanging body  61 , i.e., at a position where the condensed water is less likely to be generated, and a risk of the electronic element  71  contacting the condensed water may be reduced, and the electronic element  71  may be protected. 
     Further as shown in  FIG.  23   , the extension direction of the heat exchanging body  61  may be arranged to be the vertical direction, and the first end  61   a  may be arranged at an upper of the second end  61   b . In this way, when the condensed water is generated at the position of the heat exchanging body  61  near the second end  61   b , the condensed water may flow down in the vertical direction. That is, the condensed water may flow in a direction away from the electronic element  71  to avoid the electronic element  71  from contacting the condensed water. 
     In some embodiments, the extension direction of the heat exchanging body  61  may be arranged to be the horizontal direction based on demands, and the condensed water that is generated near the second end  61   b  position may be quickly separated from the heat exchanging body  61  due to the gravitational force, preventing the electronic element  71  from contacting the condensed water. In some embodiments, the extension direction of the heat exchanging body  61  may be arranged to be inclined at an angle with respect to the horizontal direction, which will not be limited by the present disclosure. 
     It shall be understood that, in the present embodiment, the structure of the heat dissipation member  6  may be the same as that in the above-mentioned embodiments, i.e., a bent heat exchanging body  61  may be configured. In the present embodiment, the structure of the heat dissipation member  6  may be arranged with a straight heat exchanging body  61 . In one embodiment, besides the above-mentioned heat dissipation member  6  having the micro-channels, other types of heat dissipation members may be arranged. The present embodiments do not limit the specific structure of the heat dissipation member  6 . In addition, other embodiments of the present disclosure in which the heat dissipation member is applied to the electric control box may employ the heat dissipation members in any forms as disclosed in the present disclosure or employ any heat dissipation member available in the art. 
     7.1 Cooling Medium in Heat Exchanging Body Having Fixed Flowing Direction 
     As described in the above, since the flowing direction of the cooling medium for cooling when the air conditioning system is in the refrigerating mode may be opposite to the flowing direction of the cooling medium for heating when the air conditioning system is in the heating mode, the temperature of the heat exchanging body  61  along the extension direction may change as the operating mode of the air conditioning system changes. It cannot be ensured that the temperature at the first end  61   a  is always higher than the temperature at the second end  61   b . For example, in the air conditioning system  1  shown in  FIG.  1   , the flowing direction of the cooling medium in the first heat exchanging channel  610  (primary channel) in the refrigerating mode may be opposite to the flowing direction of the cooling medium in the first heat exchanging channel  610  (primary channel) in the cooling mode. 
     Therefore, as shown in  FIG.  23   , the electric control box further includes a first unidirectional guiding member  701 , a second unidirectional guiding member  702 , a third unidirectional guiding member  703  and a fourth unidirectional guiding member  704 . An inlet of the first unidirectional guiding member  701  is connected to an end of the indoor unit (such as the indoor heat exchanger  5  in  FIG.  1   ), and an outlet of the first unidirectional guiding member  701  is connected to the fluid-collecting tube assembly  62  near the first end  61   a . An inlet of the second unidirectional guiding member  702  is connected to the fluid-collecting tube assembly  62  near the second end  61   b , and an outlet of the second unidirectional guiding member  702  is connected to the end of the indoor unit. An inlet of the third unidirectional guiding member  703  is connected to an end of a flow adjustment valve (such as the expansion valve  13  in  FIG.  1   ), and an outlet of the third unidirectional guiding member  703  is connected to the fluid-collecting tube assembly  62  near the first end  61   a . An inlet of the fourth unidirectional guiding member  704  is connected to the fluid-collecting tube assembly  62  near the second end  61   b , and an outlet of the fourth unidirectional guiding member is connected to the end of the flow adjustment valve. 
     The air conditioning system  1  is in the refrigerating mode. The cooling medium output from the compressor  2  flows to the outdoor heat exchanger  4  for heat exchanging. The cooling medium continues flowing to the flow adjustment valve (the expansion valve  13 ), and further flows through the third unidirectional guiding member  703  to enter the fluid-collecting tube assembly  62  near the first end  61   a . Further, the cooling medium flows through the heat exchanging body  61  to reach the second end  61   b . In this way, in the direction from the first end  61   a  to the second end  61   b , heat exchanging may occur between the cooling medium and the secondary channel (i.e., the cooling medium may be sub-cooled). In this way, the temperature of the heat exchanging body  61  decreases in the direction from the first end  61   a  to the second end  61   b . The cooling medium flowing from the second end  61   b  may flow through the second unidirectional guiding member  702  to reach the indoor heat exchanger  5  for heat exchanging. 
     The air conditioning system  1  is in the heating mode. The cooling medium output from the compressor  2  flows to the indoor heat exchanger  5  for heat exchanging. The cooling medium continues flowing to the electric control box  7 , and further flows through the first unidirectional guiding member  701  to enter the fluid-collecting tube assembly  62  near the first end  61   a . Further, the cooling medium flows through the heat exchanging body  61  to reach the second end  61   b . In this way, in the direction from the first end  61   a  to the second end  61   b , heat exchanging may occur between the cooling medium and the secondary channel (i.e., the cooling medium may be sub-cooled). In this way, the temperature of the heat exchanging body  61  decreases in the direction from the first end  61   a  to the second end  61   b . The cooling medium flowing from the second end  61   b  may flow through the fourth unidirectional guiding member  704  to reach the outdoor heat exchanger  4  for heat exchanging. 
     Therefore, in the present disclosure, four unidirectional guiding members are arranged between the first end  61   a  and the second end  61   b , allowing the cooling medium in the heat exchanging body  61  to flow along a fixed direction, and the electronic element  71  is always disposed on a higher temperature position of the heat exchanging body  61 , preventing the electronic element  71  from contacting the generated condensed water. 
     In some embodiments, each of the first unidirectional guiding member  701 , the second unidirectional guiding member  702 , the third unidirectional guiding member  703  and the fourth unidirectional guiding member  704  may be configured as a one-way valve. In some embodiments, each of the first unidirectional guiding member  701 , the second unidirectional guiding member  702 , the third unidirectional guiding member  703  and the fourth unidirectional guiding member  704  may be configured as an electromagnetic valve. The present disclosure does not limit a type of the unidirectional guiding member. 
     8. Mounting Plate Prevents Condensed Water from Flowing Out 
     As shown in  FIG.  24   , the electric control box  7  in the present embodiment includes a box body  72 , a mounting plate  76 , an electronic element  71  and a heat dissipation member  6 . 
     The box body  72  defines a mounting cavity  721 , and the mounting plate  76  is received in the mounting cavity  721 , and the mounting cavity  721  is divided into a first cavity  7212  and a second cavity  7214  located on two sides of the mounting plate  76 . The electronic element  71  is received in the second cavity  7214 . At least a part of the heat exchanging body  61  is received in the first cavity  7212  and is thermal-conductively connected to the electronic element  71 . The mounting plate  76  is configured to prevent the condensed water on the heat dissipation member  6  from flowing into the second cavity  7214 . 
     The mounting plate  76  is arranged inside the electric control box  7  to divide the mounting cavity  721 , and the heat exchanging body  61  and the electronic element  71  are respectively received in the first chamber  7212  and the second chamber  7214 . In this way, the electronic element  71  may be completely separated from the condensed water, preventing the electronic element  71  from being short-circuited or damaged due to contacting the condensed water. 
     Further, the heat dissipation fixing plate  74  may be arranged to indirectly connect the electronic v  71  to the heat exchanging body  61 . 
     In detail, the mounting plate  76  may define an avoidance hole  762  at a position corresponding to the heat dissipation fixing plate  74 . The heat dissipation fixing plate  74  is connected to the heat exchanging body  61  and blocks the avoidance hole  762 . The electronic element  71  is arranged on a side of the heat dissipation fixing plate  74  away from the heat exchanging body  61 . In this way, the heat dissipation fixing plate  74  may be configured to enable the electronic element  71  to be thermal-conductively connected to the heat exchanging body  61 . Further, the heat dissipation fixing plate  74  may be configured to separate the first cavity  7212  from the second cavity  7214 . Therefore, the condensed water may be prevented from flowing through the avoidance hole  762  to reach the second cavity  7214  in which the electronic element  71  is arranged, and the condensed water may be prevented from contacting the electronic element  71 . 
     Further, when a large amount of condensed water is generated on the heat exchanging body  61 , the condensed water may be accumulated and fall due to the gravitational force. The dropped condensed water may generate noise, and condensed water, which is rapidly distributed, may not be discharged out of the electric control box  7  easily. 
     Therefore, as shown in  FIG.  24   , a guiding plate  77  is arranged inside the electric control box  7 . The guiding plate  77  may be arranged on a lower side of the heat dissipation member  6  to collect the condensed water dripping from the heat dissipation member  6 . By arranging the guiding plate  77 , a height that the condensed water drops may be reduced, and the noise may be reduced. Further, the guiding plate  77  may accumulate the condensed water, and the condensed water may be accumulated and further discharged out of the electric control box  7 . 
     As shown in  FIG.  24   , the heat dissipation member  6  is fixed to the bottom plate  723  of the electric control box  7 . An end of the guiding plate  77  is connected to the bottom plate  723 , and the other end of the guiding plate  77  extends towards an interior of the first cavity  7212 . 
     Further, a projection of the heat dissipation member  6  along the vertical direction locates in the guiding plate  77 . In this way, the condensed water from the heat dissipation member  6  drops to reach the guiding plate  77 , preventing the condensed water from dropping to reach other locations of the electric control box  7 . 
     It shall be understood that, the heat dissipation member  6  may be arranged on the mounting plate  76 . In this case, an end of the guiding plate  77  is connected to the mounting plate  76 , and the other end of the guiding plate  77  extends towards the interior of the first cavity  7212 . Further, the projection of the heat dissipation member  6  along the vertical direction is located in the guiding plate  77 . 
     Further, as shown in  FIG.  25   , in order to discharge the condensed water on the guiding plate  77  out of the electric control box  7  in time, a drainage hole  725  may be defined in a bottom wall of the box body  72 , and the guiding plate  77  may be inclined at an angle with respect to the bottom wall of the box body  72 . The condensed water is guided by the guiding plate  77  and discharged from the box body  72  through the drainage hole  725 . 
     In detail, the drainage hole  725  may be defined in the circumferential side plate  724  of the electric control box  7 . The guiding plate  77  is connected to the mounting plate  76  or the bottom plate  723  of the box body  72  and is inclined towards the drainage hole  725 . After the condensed water drops on the guiding plate  77 , the condensed water may flow along the inclined guiding plate  77  to be collected at the position where the drainage hole  725  is defined, and may be drained out of the electric control box  7  from the drainage hole  725 . 
     The number and sizes of drainage holes  725  may be determined flexibly based on the amount of condensed water, and will not be limited herein. 
     In the present embodiment, the flowing direction of the cooling medium in the heat exchanging body  61  may be configured to be the horizontal direction. That is, the extension direction of the heat exchanging body  61  may be the horizontal direction. On one hand, a path that the condensed water flows in the heat exchanging body  61  may be reduced, and the condensed water may drop down to the guiding plate  77  due to the gravitational force as soon as possible, enabling the condensed water to be discharged out of the electric control box  7  in time, preventing the condensed water from contacting the electronic element  71  arranged inside the mounting cavity  721 . On the other hand, the guiding plate  77  may be prevented from interfering with the heat exchanging body  61 , and a relatively long heat exchanging body  61  may be arranged, improving the heat exchanging efficiency of the heat dissipation member  6 . 
     9. Heat Dissipation Plate Arranged at Position of Heat Dissipation Member Having High Temperature, and Condensed Water Being Vaporized to Dissipate Heat 
     As shown in  FIG.  26   , the electric control box  7  in the present embodiment includes a box body  72 , a mounting plate  76  and a heat dissipation member  6 . 
     The box body  72  defines a mounting cavity  721 , and the mounting plate  76  is received in the mounting cavity  721 , and the mounting cavity  721  is divided into a first cavity  7212  and a second cavity  7214  located on two sides of the mounting plate  76 . The mounting plate  76  defines a first air vent  764  and a second air vent  766 . The first air vent  764  and the second air vent  766  are spaced apart from each other. In this way, gas in the first cavity  7212  flows into the second cavity  7214  via the first air vent  764  and gas in the second cavity  7214  flows into the first cavity  7212  via the second air vent  766 . At least a part of the heat exchanging body  61  is received in the first cavity  7212 . A flowing direction of a part of the cooling medium in the heat exchanging body  61  is configured to be a direction that the first air vent  764  is spaced apart from the second air vent  766 . The temperature of the heat exchanging body  61  gradually increases in the direction from the second air vent  766  to the first air vent  764 . That is, a temperature of a position of the heat exchanging body  61  near the first air vent  764  is higher than a temperature of a position of the heat exchanging body  61  near the second air vent  766 . As described above, the cooling medium herein may be the cooling medium in the primary channel or in the secondary channel in the air conditioning system shown in  FIG.  1   . 
     In the present embodiment, the heat exchanging body  61  may be arranged in the horizontal direction, in the vertical direction or in other directions, which will not be limited herein. In addition, the number, positions and extension directions of first air vents  764  and second air vents  766  are not limited herein. 
     Since the temperature of a side of the heat exchanging body  61  near the second air vent  766  is low, the amount of condensed water generated at the position near the second air vent  766  may be large. In the present embodiment, the mounting plate  76  is arranged inside the electric control box  7  and defines the first air vent  764  and the second air vent  766  along the flowing direction of the cooling medium, and the first air vent  764  may be spaced apart from the second air vent  766 . When the high temperature air in the second cavity  7214  enters the first cavity  7212  through the second air vent  766 , the air may contact the condensed water, and the condensed water may be vaporized. In this way, on one hand, the condensed water may be prevented from being accumulated, and drainage structures may be omitted. On the other hand, the condensed water may be vaporized and absorb heat to reduce the temperature of the heat dissipation member  6 . The temperature of the cooling medium in the heat dissipation member  6  may be reduced, and the heat exchanging performance of the heat dissipation member  6  may be improved. 
     To be noted that, the flowing direction of the cooling medium in the heat exchanging body  61  is configured to be a direction that the first air vent  764  is spaced apart from the second air vent  766 . In this case, the flowing direction of the cooling medium may be parallel to or may be at an angle relative to direction that the first air vent  764  is spaced apart from the second air vent  766 . 
     As described in the above, since the air conditioners generally have the refrigerating mode and the heating mode, the flowing direction of the cooling medium in the refrigerating mode may be opposite to the flowing direction of the cooling medium in the heating mode. Therefore, the priority is given to the refrigerating mode, the temperature of the heat exchanging body  61  is ensured to increase gradually in the direction from the second air vent  766  to the first air vent  764 . Reasons will be explained in the following. 
     When the ambient temperature is low, for example, when the air conditioning apparatus is operating to heat the environment in winter, the temperature of the air inside the electric control box  7  is low, the temperature difference between the air inside the electric control box  7  and the heat dissipation member  6  is small. The air may not be condensed into water easily. When the ambient temperature is high, for example, when the air conditioning apparatus is operating to cool the environment in summer, the temperature of the air in the electric control box  7  is high, and the temperature difference between the air in the electric control box  7  and the heat dissipation member  6  is high. Therefore, the air may be easily condensed into water. Therefore, in the present embodiment, at least in the refrigerating mode, the temperature of the heat exchanging body  61  may gradually increase in the direction from the second air vent  766  to the first air vent  764 , preventing the condensed water from being generated on the heat dissipation member  6  in the refrigerating mode. 
     Further, the electric control box  7  may further include an electronic element  71 , and the electronic element  71  is thermal-conductively connected to the heat dissipation member  6 , and heat may be dissipated from the electronic element  71  by the heat dissipation member  6 . 
     In some embodiments, the electronic element  71  may be received in the first cavity  7212 . In order to reduce the possibility that the electronic element  71  contacts the condensed water, the electronic element  71  may be arranged at a position of the heat exchanging body  61  near the first air vent  764  and may be thermal-conductively connected to the heat exchanging body  61 . 
     In detail, while air is flowing from the second air vent  766  to the first air vent  764 , heat exchanging may continuously occur between the air and the heat dissipation member  6 , the temperature of the air gradually decreases. Further, the temperature of the heat exchanging body  61  near the first air vent  764  is high, and therefore, the temperature difference between the air and the heat dissipation member  6  may be reduced to reduce a possibility that the air is condensed at the position of the heat exchanging body  61  near the first air vent  764 . The electronic element  71  is arranged at the position of the heat exchanging body  61  near the first air vent  764 . In this way, the electronic element  71  may be prevented from contacting condensed water, and the electronic element  71  arranged on the heat exchanging body  61  may be protected. 
     In some embodiments, the first air vent  764  and the second air vent  766  may be spaced apart from each other along the horizontal direction. In this case, the extension of the heat exchanging body  61  may be along the horizontal direction. When the amount of the condensed water generated near the second air vent  766  is excessively large and cannot be vaporized in time, the condensed water may flow down in the vertical direction. Since the length of the heat exchanging body  61  in the vertical direction is small, the condensed water may leave the heat exchanging body  61  after flowing for an distance, resulting in the condensed water being dropped. 
     Therefore, in order to avoid the condensed water from being dropped, the first air vent  764  and the second air vent  766  may be spaced apart from each other along the vertical direction, the first air vent  764  is arranged at an upper of the second air vent  766 , and the extension direction of the heat exchanging body  61  may be the vertical direction. In this case, when the amount of the condensed water generated near the position of the second air vent  766  is excessively large and cannot be vaporized in time, the condensed water may flow along the vertical direction. Since the length of the heat exchanging body  61  is large along the vertical direction, a flowing path of the condensed water may be increased, and the contact area between the hot air and the condensed water may be increased, and the amount of the condensed water that may be vaporized may be increased, and the condensed water may be prevented from being dropping. The first air vent  764  is arranged at the upper of the second air vent  766 , and the electronic element  71  is arranged at the position near the first air vent  764 , and the condensed water may flow in a direction away from the electronic element  71 , and the electronic element  71  may be prevented from contacting the condensed water. 
     In some embodiments, the electronic element  71  may also be arranged inside the second cavity  7214  and may be thermal-conductively connected to the heat dissipation member  6  via the heat dissipation fixing plate  74 . Connection between the electronic element  71  and the heat dissipation fixing plate  74  may be the same as and referred to the above embodiments. 
     Further, in order to increase a flowing speed of air in the first cavity  7212  and in the second cavity  7214 , a cooling fan  78  may be arranged inside the electric control box  7  to increase the air ventilation effect of the first cavity  7212  and the second cavity  7214 . 
     As shown in  FIG.  26   , the cooling fan  78  may be received in the second cavity  7214 . 
     The cooling fan  78  in the second cavity  7214  may provide a forced ventilation enables the air to flow from the second air vent  766  to the first cavity  7212 . 
     In detail, since the electronic element  71  is received in the second cavity  7214 , the heat generated while the electronic element  71  is operating may enable the temperature in the second cavity  7214  to be higher than the temperature in the first cavity  7212 . By arranging the cooling fan  78  in the second cavity  7214 , the speed that the high temperature air flows from the second air vent  766  to the first cavity  7212  may be increased in order to enhance the speed that the condensed water is vaporized. 
     Further, the cooling fan  78  may be arranged at the position near the first air vent  764  to increase a distance between the cooling fan  78  and the second air vent  766 , increasing an operating range of the cooling fan  78 , and the cooling fan  78  may drive more air to flow into the second air vent  766 . 
     Further, a temperature sensor (not shown in the drawings) may be arranged inside the electric control box  7 . The temperature sensor may be configured to detect the temperature in the second cavity  7214 . In this way, when the temperature sensor detects that the temperature in the second cavity  7214  is greater than a temperature threshold, the cooling fan  78  may be controlled to start operating, or an operating speed of the cooling fan  78  may be increased. 
     In detail, the temperature sensor may be arranged within the second cavity  7214  of the electric control box  7  to detect the temperature of the second cavity  7214 . When the heat generated due to the electronic element  71  being operating is relatively large, causing the temperature inside the second cavity  7214  to be greater than the temperature threshold, the temperature sensor may be triggered and transmit a high temperature trigger signal to a main board. The main board may turn on the cooling fan  78  to accelerate the flowing speed of the air inside the second cavity  7214 , and a speed that the air circulates between the first cavity  7212  and the second cavity  7214  may be increased, and the speed that the condensed water is vaporized may be increased. When the temperature within the second cavity  7214  decreases and is below the temperature threshold, the temperature sensor may be triggered and transmit a low temperature trigger signal to the main board, and the main board may turn off the cooling fan  78  to save energy. 
     The value of the temperature threshold may be determined as required and will not be limited by the present disclosure. 
     10. Arranging Heat Dissipation Plate on Upstream of Heat Dissipation Member, Arranging Heat Dissipation Fin on Downstream of Heat Dissipation Member 
     As shown in  FIG.  27   , the electric control box  7  in the present embodiment includes a box body  72 , a heat dissipation member  6 , an electric element  71  and a heat dissipation fin  5 . 
     The box body  72  defines a mounting cavity  721 . At least a part of the heat exchanging body  61  is received in the mounting cavity  721 . The electronic element  71  is thermal-conductively connected to the heat exchanging body  61  at a first position, and the heat dissipation fin  75  is thermal-conductively connected to the heat exchanging body  61  at a second position. The first position and the second position are spaced apart from each other along the flowing direction of the cooling medium of the heat exchanging body  61 . As described above, the cooling medium herein may be the cooling medium in the primary channel or in the secondary channel in the air conditioning system shown in  FIG.  1   . 
     In the present embodiment, the electronic element  71  and the heat dissipation fin  75  are spaced apart from each other along the flowing direction of the cooling medium of the heat exchanging body  61 . The space on the heat exchanging body  61  may be optimally utilized. The heat exchanging body  61  may dissipate heat from the electronic element  71 . Further, the heat dissipate fin  75  may be configured to reduce the temperature in the mounting cavity  721  of the electric control box  7 , and the electronic elements  71  arranged inside the mounting cavity  721  may be protected. 
     Further, the heat exchanging body  61  includes the first end  61   a  and the second end  61   b . The first end  61   a  and the second end  61   b  are spaced apart from each other along the flowing direction of the cooling medium. The temperature of the heat exchanging body  61  decreases gradually in the direction from the first end  61   a  to the second end  61   b . That is, the temperature of the first end  61   a  is higher than the temperature of the second end  61   b . Compared to the second position, the first position may be closer to the first end  61   a.    
     In detail, while the heat exchanging body  61  is operating, since the temperature of the surface of the heat exchanging body  61  may change along with the flowing direction of the cooling medium, the temperature of the first end  61   a  may be higher than the temperature of the second end  61   b . Since a temperature difference between the higher temperature first end  61   a  and the hot air in the mounting cavity  721  is relatively small, the condensed water may be less likely generated. Therefore, the electronic element  71  may be arranged near the first end  61   a , i.e., the first position is a position near the first end  61   a . Since a temperature difference between the lower temperature second end  61   b  and the hot air in the mounting cavity  721  is relatively large, the condensed water may be more likely generated. Therefore, the heat dissipation fin  75  may be arranged near the second end  61   b . On one hand, the lower temperature of the heat dissipation fin  75  may allow the temperature difference between the heat dissipation fin  75  and the hot air to be large, and the heat may be dissipated from the electric control box  7 . On the other hand, the condensed water formed on the heat dissipation fin  75  may be vaporized due to the hot air. Evaporation of the condensed water may absorb heat to further reduce the temperature of the cooling medium, improving the heat exchanging effect of the heat dissipation member  6 . 
     10.1 Increasing Flowing Speed of Heat Dissipation Air 
     Further, the cooling fan  78  is arranged inside the electric control box  7 . The cooling fan  78  is configured to generate a heat dissipation airflow on the heat dissipation fin  75  in the electric control box  7 . In this way, the flowing speed of the heat dissipation airflow may be increased, improving the heat exchanging effect. 
     In some embodiments, the cooling fan  78  may be arranged at a position near the heat dissipation fin  75  to act directly on the heat dissipation fin  75 . 
     In some embodiments, as shown in  FIG.  28   , the mounting plate  76  is arranged inside the electric control box  7 . The mounting plate  76  is received in the mounting cavity  721 , and the mounting cavity  721  is divided into the first cavity  7212  and the second cavity  7214 , and the first cavity  7212  and the second cavity  7214  are located on two sides of the mounting plate  76 , respectively. The mounting plate  76  defines the first air vent  764  and the second air vent  766  spaced apart from the first air vent  764 , and the gas in the first cavity  7212  flows into the second cavity  7214  through the first air vent  764 , and the gas in the second cavity  7214  flows into the first cavity  7212  through the second air vent  766 . At least a part of the heat exchanging body  61  is received in the first cavity  7212 , and the electronic element  71  and the cooling fan  78  are received in the second cavity  7214 . 
     In the present embodiment, the mounting plate  76  is configured to divide the mounting cavity  721  into two independent cavities, the first cavity  7212  and the second cavity  7214 , and a circulating airflow may be generated in the first cavity  7212  and the second cavity  7214 . Therefore, the amount of air that contacts the heat dissipation fin  75  received in the first cavity  7212  may be increased, and cooled air may dissipate heat from the electronic element  71  received in the second cavity  7214 , airflows may not be mixed, and the heat dissipation efficiency of the heat dissipation fin  75  may be improved. 
     The cooling fan  78  received in the second cavity  7214  is configured to increase the flowing speed of the air in the second cavity  7214 , and the speed that the air circulates between the first cavity  7212  and the second cavity  7214  may be increased, and the efficiency of dissipating heat from the electric control box  7  may be increased. 
     Further, a direction that the heat dissipation air flows along the heat dissipation fin  75  may be configured to be perpendicular to the flowing direction of the cooling medium. 
     As shown in  FIG.  27    and  FIG.  28   , when the cooling medium in the heat exchanging body  61  is flowing in the horizontal direction, the heat dissipation air may be configured to flow in the vertical direction, and the heat dissipation air may not flow to the position where the electronic element  71  is arranged. 
     In detail, the first air vent  764  and the second air vent  766  may be spaced apart from each other along the vertical direction and are disposed on opposite sides of the heat dissipation fin  75 . The number and an arrangement density of first air vents  764  and the number and an arrangement density of second air vents  766  may be determined based on demands. 
     In some embodiments, when the cooling medium in the heat exchanging body  61  is flowing in the vertical direction, the heat dissipation air may be configured to flow in the horizontal direction, and the heat dissipation air may not flow to the position where the electronic element  71  is arranged. In some embodiments, the flowing direction of the heat dissipation air and the flowing direction of the cooling medium may be along another two perpendicular directions, which will not be limited by the present disclosure. 
     Further, when the first air vent  764  and the second air vent  766  are arranged in the vertical direction, the first air vent  764  may be arranged at an upper of the second air vent  766 , and the hot air entering the first cavity  7212  through the second air vent  766  may automatically flow to the position where the heat exchanging body  61  is arranged, and heat exchanging may occur between the hot air and the heat exchanging body  61 . 
     In some embodiments, the cooling fan  78  may be arranged at the position near the first air vent  764 , and cold air located at a top of the first cavity  7212  may enter the second cavity  7214  in time, and the cooling fan  78  may accelerate the cold air to increase the efficiency of dissipating heat from the electronic element  71 . 
     11. Internal Circulation 
     Generally, in order to cool down the electric control box  7 , a heat dissipation hole may be defined in the box body  72  of the electric control box  7  and may be communicated with the mounting cavity  721 , and the air inside the box may be circulated with the air out of the box to achieve heat exchanging, and the electric control box  7  may be cooled down. However, when the box body  72  defines the heat dissipation hole, air tightness of the electric control box  7  may be reduced, impurities, such as water and dust at the outside of the box, may enter the mounting cavity  721  through the heat dissipation hole, and the electronic element arranged in the mounting cavity  721  may be damaged. 
     In the present embodiment, in order to solve the above problem, the box body  72  of the electric control box  7  may be configured as a sealed box body. In detail, as shown in  FIG.  29   , the electric control box  7  may include the box body  72 , the mounting plate  76 , the heat dissipation member  6 , the electronic element  71  and the cooling fan  78 . 
     The box body  72  defines the mounting cavity  721 . The mounting plate  76  is received in the mounting cavity  721 , and the mounting cavity  721  is divided into the first cavity  7212  and the second cavity  7214 , and the first cavity  7212  and the second cavity  7214  are located on two sides of the mounting plate  76 , respectively. The mounting plate  76  defines the first air vent  764  and the second air vent  766  spaced apart from the first air vent  764 . The first air vent  764  and the second air vent  766  are communicated with the first cavity  7212  and the second cavity  7214 . At least a part of the heat exchanging body  61  is received in the first cavity  7212 , and the electronic element  71  is received in the second cavity  7214  and is thermal-conductively connected to the heat dissipation member  6 . The cooling fan  78  is configured to supply air, and the gas in the first cavity  7212  flows into the second cavity  7214  through the first air vent  764 . 
     In the present embodiment, at least a part of the heat dissipation member  6  is received in the first cavity  7212 , and the electronic element  71  and the cooling fan  78  are received in the second cavity  7214 . The mounting plate  76  defines the first air vent  764  and the second air vent  766  spaced apart from the first air vent  764 , and the first air vent  764  and the second air vent  766  are communicated with the first cavity  7212  and the second cavity  7214 . In this way, the heat generated by the electronic element  71  causes the air in the second cavity  7214  to be increased, the cooling fan  78  drives the hot air to flow into the second air vent  766 . Since the hot air has a low density, the hot air may flow upwardly to contact the heat dissipation member  6  received in the first cavity  7212 . The heat dissipation member  6  may cool the hot air into cold air. The cold air flows into the second cavity  7214  through the first air vent  764 . The cooling fan  78  is configured to accelerate the flowing speed of the cold air. In this way, the cold air may be taken to cool the electronic element  71  received in the second cavity  7214 . A temperature of the cold air, which exchanges heat with the electronic element  71 , may be increased, and the cold air, which has the increased temperature, may be driven by the cooling fan  78  to enter the second air vent  766 . The above circulation may occur periodically. In this way, the internal circulation may be generated to cool the electronic element  71  received in the electric control box  7 . Compared to defining the heat dissipation hole in the electric control box  7  to cool the control box, in the present embodiment, the electric control box  7  may be completely sealed, and waterproof, insect-proof, dust-proof and moisture-proof may be achieved, and the reliability of the electric control box  7  may be improved. 
     As shown in  FIG.  29   , the cooling fan  78  is mounted in the first air vent  764 . A plane in which the cooling fan  78  is located may be coplanar with a plane in which the mounting plate  76  is located. 
     In detail, the cooling fan  78  may be fixedly arranged in the first air vent  764  by a fan bracket (not shown in the drawings). The plane in which the cooling fan  78  is located may refer to a plane perpendicular to a direction of a rotational axis of the cooling fan  78 . Since the cooling fan  78  is arranged in the first air vent  764 , a distance between the cooling fan  78  and the first cavity  7212  may be reduced, and the cold air may be easily discharged out of the first cavity  7212 . Further, the cooling fan  78  may not occupy any space of the second cavity  7214 , and elements inside the electric control box  7  may be arranged more compact, and the size of the electric control box  7  may be reduced. 
     The electronic element  71  is usually arranged on the mounting plate  76 . Therefore, when the plane in which the cooling fan  78  is located is coplanar with the plane in which the mounting plate  76  is located, the flowing direction of the air of the cooling fan  78  may be perpendicular to the plane in which the mounting plate  76  is located. In this way, the flowing direction of the air of the cooling fan  78  may not act directly on the electronic element  71 , and a path that the air flows in the second cavity  7214  may be increased. 
     Therefore, as shown in  FIG.  11    and  FIG.  29   , an air guiding cover  79  may be arranged inside the electric control box  7 . The air guiding cover  79  may be arranged to cover a periphery of the cooling fan  78  and configured to guide the air blown by the cooling fan  78 , and the air blown from the cooling fan  78  may be directed towards the electronic element  71 . 
     In detail, the air guiding cover  79  is connected to the mounting plate  76 . An air outlet of the air guiding cover  79  faces towards the position where the electronic element  71  is arranged. In this way, the air blown by the cooling fan  78 , after being guided by the air guiding cover  79 , may flow to the position where the electronic element  71  is arranged. On one hand, the cold air may act directly on the electronic element  71  to increase the efficiency of dissipating heat from the electronic element  71 . On the other hand, the air guiding cover  79  may increase a speed that the cold air flows through the electronic element  71 , and the efficiency of dissipating heat from the electronic element  71  may further be improved. 
     In an embodiment, as shown in  FIG.  30   , the plane in which the cooling fan  78  is located is perpendicular to the plane in which the mounting plate  76  is located, and a leeward side of the cooling fan  78  may face towards the first air vent  764 . 
     In detail, the cooling fan  78  may be arranged on a side of the mounting plate  76  facing the second cavity  7214 . The direction of the rotational axis of the cooling fan  78  may be parallel to the plane in which the mounting plate  76  is located. The leeward side of the cooling fan  78  may refer to an air inlet side of the cooling fan  78 . In the present embodiment, the cooling fan  78  may be disposed between the first air vent  764  and the electronic element  71 . The cold air that enters the second cavity  7214  via the first air vent  764  is accelerated by the cooling fan  78  and subsequently flows out, and the flowing speed of the cold air may be increased, and the efficiency of dissipating heat from the electric control box  7  may be increased. 
     Further, as shown in  FIG.  30   , in order to enable the entire cold air that enters through the first air vent  764  to be accelerated by the cooling fan  78 , the electric control box  7  may further define a return air duct  791 . The return air duct  791  may be communicated between the first air vent  764  and the cooling fan  78  to direct the air in the first cavity  7212  to flow to the cooling fan  78 . In this way, the cold air that enters through the first air vent  764  is all directed to the cooling fan  78  through the return air duct  791  and is accelerated by the cooling fan  78 , and the flowing speed of the cold air may be increased, and the efficiency of dissipating heat from the electric control box  7  may be increased. 
     Further, as shown in  FIG.  30   , the electric control box  7  may further define an air supply duct  792 . The air supply duct  792  may be connected to a side of the cooling fan  78  away from the return air duct  791  and configured to guide the air blown by the cooling fan  78 , and the air, after being guided by the air supply duct  792 , may be directed towards the electronic element  71 . 
     In detail, the air supply duct  792  may be configured to direct the air blown by the cooling fan  78 , and the air blown out of the cooling fan  78  may be directed towards the electronic element  71 . In this way, a proportion of the cool air flowing to the position where the electronic element  71  is arranged may be increased, and the efficiency of dissipating heat from the electronic element  71  may be increased. 
     In some embodiments, as shown in  FIG.  31   , the cooling fan  78  may be a centrifugal fan. 
     For the centrifugal fan, a mechanical energy input to the fan may be taken to increase an air pressure, and the air may be output. A working principle of the centrifugal fan may refer to taking a high-speed rotating impeller to accelerate the air. Therefore, in the present embodiment, the cooling fan  78  is configured as the centrifugal fan. On one hand, a high speed cold air may be obtained to improve the efficiency of cooling the electronic element  71 . On the other hand, compared to the cooling fan  78  with the return air duct  791  and air supply duct  792 , the centrifugal fan may have a simplified structure, an efficiency of mounting the cooling fan  78  may be increased. 
     In some embodiments, when electronic elements  71  are rapidly distributed, arranging the air guiding cover  79  and defining the air supply duct  792  may allow the direction of the guided air to be fixed. Although efficiencies of dissipating heat from some electronic elements  71  that are located along the air flowing direction may be increased, electronic elements  71  that are highly deviated from the air flowing direction may not be cooled effectively. 
     Therefore, air guiding plates (not shown in the drawings) may be spaced apart from each other and arranged on the mounting plate  76 . An air guiding channel may be formed between adjacent air guiding plates and configured to direct the air blown by the cooling fan  78 . 
     For example, two parallel air guiding plates, which are spaced apart from each other, may be arranged between the rapidly distributed electronic elements  71 . An extension direction of the air guiding plate may follow a direction that the electronic elements  71  are spaced apart from each other, and the two air guiding plates may define the air guiding channel along the direction that the electronic elements  71  are spaced apart from each other. The cool air blown by the cooling fan  78  firstly flows to positions of a part of the electronic elements  71  to dissipate heat from the part of electronic elements  71 . The air that passes through the part of the electronic elements  71  further flows along the air guiding channel to reach positions of another part of the electronic elements  71  for dissipating heat from the another part of the electronic elements  71 . In this way, the heat of the electronic elements  71  may be dissipated uniformly, temperatures of a part of electronic elements  71  may not be excessively high, and the part of electronic elements  71  may not be damaged. 
     The heat dissipation member  6  may be arranged inside the electric control box  7 . That is, the heat exchanging body  61  may be arranged inside the first cavity  7212  to cool the air in the first cavity  7212 . 
     In some embodiments, the heat dissipation member  6  may be arranged on the outside of the electric control box  7 , and at least a part of the heat dissipation member  6  is extending into the first cavity  7212 . For example, when the heat dissipation member  6  includes the heat exchanging body  61 , the fluid-collecting tube assembly  62  and the heat dissipation fin  75 , the box body  72  may define an assembly port (not shown) communicated with the first cavity  7212 . In this case, the heat exchanging body  61  is connected to an outer wall of the box body  72 , and the heat dissipation fin  75  is connected to the heat exchanging body  61  and inserted into the first cavity  7212  through the assembly port. 
     In the present embodiment, engagement between the heat dissipation member  6  and the electric control box  7  may be the same as and may be refer to the engagement described in the above embodiments, and will not be repeated herein. 
     As shown in  FIG.  31   , the electronic element  71  may be disposed within a range covered by the air supplied by the cooling fan  78 , and the cooling fan  78  may act directly on the electronic elements  71  to cool the electronic elements  71 . 
     The electronic elements  71  may include primary heating elements and secondary heating elements. The primary heating elements, such as a common mode inductor  711 , a reactor  712  and a capacitor  713 , may generate a large amount of heat. The secondary heating elements, such as a fan module  714 , may generate less heat. In order to improve the efficiency of dissipating heat from the primary heating elements, a distance between the primary heating elements and the first air vent  764  may be configured to be less than a distance between the secondary heating elements and the first air vent  764 . That is, the primary heating elements, which may generate larger amount of heat, may be arranged at positions near the first air vent  764 . The secondary heating elements, which may generate less amount of heat, may be arranged at positions away from the first air vent  764 . In this way, the air, which has a relatively low temperature and enters through the first air vent  764 , may firstly act on the primary heating elements which may generate larger amount of heat, and the efficiency of dissipating heat from the primary heating elements, which may generate larger amount of heat, may be increased. 
     In some embodiments, the second air vent  766  may be defined at an end of the air supplied by the cooling fan  78  and at a position near the electronic elements  71 , which may generate larger amount of heat. On one hand, an operating range of the cooling fan  78  may be expanded, and a circulation efficiency of the air in the second cavity  7214  may be increased. On the other hand, the hot air, after exchanging heat with the electronic elements  71  which may generate larger amount of heat, may be discharged from the second cavity  7214  in time, preventing the temperature of the second cavity  7214  from being increased. 
     Further, the second air vent  766  may be defined at a position near the first air vent  764  to reduce a path that the air circulates in the second cavity  7214 , a resistance to air flowing may be reduced, an air circulation efficiency may be increased, and the efficiency of dissipating heat from the electric control box  7  may be improved. 
     Further, a size of the first air vent  764  and a size of the second air vent  766  may be determined based on the arrangement of the electronic elements  71 . 
     In detail, second air vents  766  may be defined. The second air vents  766  may be defined at different positions of the mounting plate  76 . A size of the second air vent  766  defined at the position near the electronic elements  71 , which generate larger amount of heat, may be relatively large. The number of second air vents  766  near the primary electronic elements may be relatively large. The second air vents  766  near the primary electronic elements may be densely distributed. A size of the second air vent  766  defined at the position near the electronic elements  71 , which generate less amount of heat, may be relatively small. The number of second air vents  766  near the primary electronic elements may be relatively less. The second air vents  766  near the primary electronic elements may be less-densely distributed. 
     Further, a size of the first air vent  764  may be larger than a size of the second air vent  766  to increase an amount of returned airflow, improving the efficiency of the cooling fan  78 . 
     12. Natural Air Convection 
     As shown in  FIG.  32    and  FIG.  33   , the electric control box  7  may include the box body  72 , the mounting plate  76 , the heat dissipation member  6  and the primary heating element  715 . 
     The box body  72  defines the mounting cavity  721 . The mounting plate  76  is received in the mounting cavity  721 , and the mounting cavity  721  is divided into the first cavity  7212  and the second cavity  7214 , and the first cavity  7212  and the second cavity  7214  are located on two sides of the mounting plate  76 , respectively. The mounting plate  76  defines the first air vent  764  and the second air vent  766  spaced apart from the first air vent  764 . The first air vent  764  and the second air vent  766  are arranged in the vertical direction. At least a part of the heat dissipation member  6  is received in the first cavity  7212 . The primary heating element  715  is received in the second cavity  7214 . The first air vent  764  and the second air vent  766  are communicated to the first cavity  7212  and the second cavity  7214 , and a circulating air flow for heat dissipation may be generated between the first cavity  7212  and the second cavity  7214  by taking a temperature difference between the primary heating element  715  and the heat dissipation member  6 . 
     In detail, the primary heating element  715  are received in the second cavity  7214 . The heat generated while the primary heating element  715  is operating causes the temperature in the second cavity  7214  to increase. Since the hot air has a low density, the hot air naturally flows upwardly and enters the first cavity  7212  through the first air vent  764  located at the top of the second cavity  7214 . The hot air contacts the heat dissipation member  6  and exchanges heat with the heat dissipation member  6 . The temperature of the hot air decreases, and the density of the air increases. The air naturally flows downwardly to a bottom of the first cavity  7212  under the gravitational force. Further, the air enters the second cavity  7214  through the second air vent  766  to cool the primary heating element  715 . After exchanging heat with the primary heating element  715 , the hot air flows upwardly to the position where the first air vent  764  is defined. In this way, an internal circulating airflow between the first cavity  7212  and the second cavity  7214  is generated. 
     In the present embodiment, the mounting plate  76  defines the first air vent  764  and the second air vent  766 . The first air vent  764  and the second air vent  766  are communicated with the first cavity  7212  and the second cavity  7214 , and are arranged in the vertical direction. The air may circulate between the first cavity  7212  and the second cavity  7214  due to the gravitational force applied to the air, and the air may cool down the electronic elements  71  received in the second cavity  7214 , and an overall temperature of the electric control box  7  may be reduced. Compared to taking the cooling fan  78  to supply air, the structure of the electric control box  7  in the present embodiment may be simpler, an assembling efficiency of the electric control box  7  may be increased, and the production cost of the electric control box  7  may be reduced. 
     Further, the heat dissipation member  6  may be arranged on an upper of the primary heating element  715  along the gravitation direction. That is, the heat dissipation member  6  may be arranged at a position near the top of the first cavity  7212 , and the primary heating element  715  may be arranged at a position near the bottom of the second cavity  7214 . In this way, a distance between the heat dissipation member  6  and the first air vent  764  may be reduced, and the hot air entering the first cavity  7212  via the first air vent  764  may contacts the heat dissipation member  6  and may be cooled quickly. The cooled air may naturally flow downwardly due to the gravitational force. By reducing the distance between the primary heating element  715  and the second air vent  766 , the hot air entering the second cavity  7214  through the second air vent  766  may contact the primary heating element  715  and may be heated quickly, and the heated air may flow upwardly due to air buoyancy. In this way, the speed that the air circulates in the electric control box  7  may be increased, and the heat dissipation efficiency may be improved. 
     Further, as shown in  FIG.  33   , the secondary heating element  716  may be arranged inside the electric control box  7 . The secondary heating element  716  may be received in the second cavity  7214  and may be thermal-conductively connected to the heat exchanging body  61 . 
     The amount of heat generated by the secondary heating element  716  may be less than the amount of heat generated by the primary heating element  715 . 
     In detail, in the present embodiment, the primary heating element  715 , which generates a large amount of heat, may be arranged near the second air vent  766 . On one hand, the cold air entering through the first cavity  7212  may firstly contact the electronic element  71 , which generates the large amount of heat, to improve the efficiency of dissipating heat from the electronic element  71 . On the other hand, a large temperature difference may be generated between the cold air and the electronic element  71  which generates the large amount of heat, and the cold air may be heated quickly and flow upwardly due to the air buoyancy. The secondary heating element  716 , which generates less amount of heat, may be arranged on and contact the heat exchanging body  61 . The heat exchanging body  61  may be configured to directly cool the electronic element  71 , which generates less amount of heat. In this way, the primary heating element  715 , which generates large amount of heat, and the secondary heating element  716 , which generates less amount of heat, may be disposed in different regions, the electronic elements  71  may be distributed more reasonably, and the internal space of the electric control box  7  may be optimally utilized. 
     In some embodiments, the secondary heating element  716  is connected to the heat exchanging body  61  through the heat dissipation fixing plate  74 , and the efficiency of assembling the secondary heating element  716  may be improved. 
     Connection between the secondary heating element  716  and the heat exchanging body  61  may be the same as and may be referred to the description of the above-mentioned embodiments, and will not be repeated herein. 
     In some embodiments, the heat dissipation member  6  may be arranged on the outside of the electric control box  7 , and at least a part of the heat dissipation member  6  may extend to the inside the first cavity  7212 . 
     Engagement between the heat dissipation member  6  and the electric control box  7  may be the same as and referred to the description of the above-mentioned embodiments, and will not be repeated herein. 
     Structures in the above various embodiments may be combined with each other. It shall be understood that, the heat dissipation members  6  as described in the above may be applied in the embodiments, heat dissipation members  6  in other forms may be applied. The present disclosure does not limit the structure of heat dissipation member  6  applied in the embodiments. 
     The above description shows only embodiments of the present disclosure, and does not limit the scope of the present disclosure. Any equivalent structure or equivalent process transformation performed based on the specification and accompanying drawings, applied directly or indirectly in other related fields, shall be equally covered by the scope of the present disclosure.