Patent Publication Number: US-2023145891-A1

Title: Heat exchange device

Description:
This application is a National Phase entry of PCT Application No. PCT/CN2021/090450, filed on Apr. 28, 2021, which claims the benefit of priority to Chinese Patent Application No. 202010362743.9, titled “HEAT EXCHANGE DEVICE”, filed with the State Intellectual Property Office of People&#39;s Republic of China on Apr. 30, 2020, which are incorporated herein by reference in their entirety. 
     FIELD 
     The present application relates to the technical field of thermal management, and in particular to a heat exchange device. 
     BACKGROUND 
     A thermal management system includes a circuit for circulating a refrigerant. A heat exchanger and an expansion valve are required in the thermal management system, and the above two members are generally connected by pipelines in the thermal management system. 
     Various members of the heat exchanger are fixed by welding, and the heat exchanger may highly shrink after welding because of the melting of the solder during welding. Therefore, a valve body of the expansion valve may be fixed to a mounting plate of the heat exchanger in an integration of the heat exchanger and the expansion valve. 
     SUMMARY 
     An object of the present application is to provide a heat exchange device with good sealing performance. 
     A heat exchange device is provided according to an embodiment of the present application, which includes a valve core member, a core body member, and the valve core member is fixed to the core body member;
         the core body member includes a plate portion, the plate portion includes multiple plates, the plate portion at least includes a first hole passage, a second hole passage and an inter-plate passage, and the first hole passage, the second hole passage and the inter-plate passage are in communication;   the heat exchange device includes a connecting member, the connecting member includes a first end portion and a second end portion, the first end portion is located in the first hole passage, the second end portion includes a welding section and an adjacent section, the core body member includes a welding matching portion, the welding section is welded to the welding matching portion, the adjacent section is adjacent to the welding section, an outer diameter of the welding section is smaller than or equal to an inner diameter of the welding matching portion, an outer diameter of the adjacent section is smaller than or equal to the inner diameter of the welding matching portion; and a distance between an end, away from the valve core member, of the welding matching portion and an end, away from the valve core member, of the welding section is greater than or equal to zero; and   the valve core member includes a valve seat portion, the valve seat portion includes a bottom opening, a throttle hole and a peripheral opening, and the peripheral opening is in communication with the bottom opening through the throttle hole, and the peripheral opening is in communication with a part, outside the connecting member, of the first hole passage; the connecting member includes a communication chamber, and the bottom opening is in communication with the communication chamber of the connecting member.       

     The technical solution according to the present application includes the connecting member, the welding section of the connecting member is welded to the welding matching portion, the adjacent section is adjacent to the welding section, the outer diameter of the welding section is smaller than or equal to the inner diameter of the welding matching portion, and the outer diameter of the adjacent section is smaller than or equal to the inner diameter of the welding matching portion; in this way, since the connecting member includes the welding section and the adjacent section in a case that the core body member shrinks during welding, the distance between the end, away from the valve core member, of the welding matching portion and the end, away from the valve core member, of the welding section is larger than or equal to zero, so that the welding matching portion is movable relative to the connecting member during the welding shrinkage of the core body member, and the welding between the connecting member and the core body member has good sealing performance. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG.  1    is a schematic structural view of an embodiment of a heat exchange device; 
         FIG.  2    is a schematic cross-sectional view of  FIG.  1   ; 
         FIG.  3    is a schematic perspective exploded view of  FIG.  1   ; 
         FIG.  4    is a schematic cross-sectional view of a second embodiment of the heat exchange device; 
         FIG.  5    is a schematic perspective exploded view of the heat exchange device shown in  FIG.  4   ; 
         FIG.  6    is a schematic cross-sectional view of another embodiment of the heat exchange device; and 
         FIG.  7    is schematic cross-sectional view of yet another embodiment of the heat exchange device. 
     
    
    
     DETAILED DESCRIPTION OF THE EMBODIMENTS 
     Referring to  FIGS.  1  to  3   ,  FIG.  1    is a schematic structural view of a heat exchange device  1 . 
     The heat exchange device  1  at least includes a first flow passage  101  and a second flow passage, the fluid in the first flow passage  101  can exchange heat with the fluid in the second flow passage; the fluid in the first flow passage  101  may be a refrigerant, and the fluid in the second flow passage may be a coolant. The heat exchange device  1  may include a third flow passage, a fourth flow passage, and the like. 
     The heat exchange device  1  includes a valve core member  11 , a core body member  12  and a connecting member  13 , the valve core member  11  is assembled with and fixed to the core body member  12 , and the connecting member  13  is fixed to the core body member  12 , such as by welding. The valve core member  11  may be of, for example, a valve core structure of an expansion valve. 
     The core body member  12  includes a top pressing block  122 , a plate portion  121  and a bottom pressing block  123 , and the top pressing block  122 , the plate portion  121  and the bottom pressing block  123  are fixed by welding. The plate portion  121  at least includes a first hole passage  1211 , a second hole passage  1213  and an inter-plate passage  1212 , the first hole passage  1211 , the inter-plate passage  1212  and the second hole passage  1213  are in communication, and the first flow passage  101  includes part of the first hole passage  1211 , the second hole passage  1213  and the inter-plate passage  1212 . 
     Herein, the first hole passage  1211  and the second hole passage  1213  are hole passages when the core body member  12  is not assembled with the valve core member  11 . After the first hole passage  1211  and the second hole passage  1213  are assembled with the valve core member or the connecting member, even if a member or part is located in other members, it still means that the member or the part herein is located in the first hole passage or the second hole passage as long as a position of the member is in the first hole passage or the second hole passage of the core body member. 
     The plate portion  121  includes multiple stacked plates, adjacent plates are fixed by welding, each plate at least includes a first hole and a second hole, the first holes of the plates are aligned and the second holes of the plates are aligned along a stacking direction of the plates. The first hole and the second hole are located adjacent to an edge of the plate, so that the fluid flowing through the plate can have a relatively long flow path, which is beneficial to improving the heat exchange efficiency. The first holes of the plates are aligned to form a part of the first hole passage  1211 , and the second holes of the plates are aligned to form a part of the second hole passage  1213 . 
     The top pressing block  122  includes a third hole  1221 , the third hole  1221  is aligned with the first holes, and the “aligned” herein includes that the first holes is coaxial with the third hole, or, an axis of the first holes is parallel to an axis of the third hole; the bottom pressing bock  123  includes a communication hole  1231 , the communication hole  1231  is aligned with the first holes, and the “aligned” herein includes that the first holes is coaxial with the third hole, or, the axis of the first holes is parallel to the axis of the third hole. 
     The heat exchange device  1  includes a communication passage  103  and another communication passage  104 , the communication passage  103  is in communication with a communication chamber  138  of the connecting member  13 , and the another communication passage  104  is in communication with the second hole passage  1213 , so that the fluid can flow in from the communication passage  103  and flow through an inner chamber of the connecting member  13 , and flow in the first flow passage and then flow in the inter-plate passage  1212  of the core body member  12  after being throttled by the valve core member  11 , and the fluid exchanges heat with the fluid in the second flow passage in the inter-plate passage  1212 , which has a simple flow path and high heat exchange efficiency. Alternatively, in other cases, the another communication passage  104  may be in indirect communication with the second hole passage  1213 . For example, a pipe may be provided in the second hole passage  1213 , and the second hole passage  1213  is in communication with the another communication passage  104  through the pipe. In other cases, the another communication passage  104  may not be in communication with the inter-plate passage  1212  through the second hole passage  1213 , the another communication passage  104  and the communication passage  103  may be arranged on a same side of the core body member  12 , and the another communication passage  104  may be adjacent to the communication passage  103  and in indirect communication with the communication passage  103 . 
     The core body member  12  includes a first side portion  124  and a second side portion  126 , at least part of the valve core member  11  is located on a side where the first side portion  124  is located, or in other words, the first side portion  124  of the core body member  12  refers to a side, provided with the valve core member  11 , of the core body member  12 . The communication passage  103  is located on a side where the second side portion  126  is located, and the communication passage  103  is in communication with the communication chamber  138 . For example, the valve core member  11  includes a coil portion  1120 , and the coil portion  1120  is located on the side where the first side portion  124  is located. 
     At least part of the valve core member  11  inserts into the first hole passage  1211 , and at least part of the connecting member  13  inserts into the first hole passage  1211 . 
     The valve core member  11  includes a valve seat portion  111 , at least part of the valve seat portion  111  is located in the first hole passage  1211 , the valve seat portion  111  includes a peripheral opening  1113 , a throttle hole  1114  and a bottom opening  1115 , the peripheral opening  1113  is in communication with the first hole passage  1211  and in communication with the inter-plate passage  1212 , the connecting member  13  includes the communication chamber  138 , one end of the connecting member  13  is located in the first hole passage  1211 , the bottom opening  1115  is in communication with the communication chamber  138  of the connecting member  13 , and the communication chamber  138  is not in direct communication with the first hole passage  1211 . The valve core member  11  may be a valve core portion of an electronic expansion valve. In this way, the fluid from the communication chamber  138  of the connecting member  13  can flow in the inter-plate passage  1212  through the bottom opening  1115 , the throttle hole  1114 , the peripheral opening  1113  and the first hole passage  1211 , so that the fluid can exchange heat with the fluid between adjacent plates inside the plate portion  121 . The peripheral opening  1113  may be in direct communication with the first hole passage  1211 , or may be in direct communication with the inter-plate passage  1212 . 
     Herein, the communication chamber  138  is not in direct communication with the first hole passage  1211 , which does not exclude a transfer communication between the communication chamber  138  and the first hole passage  1211  by providing other members. 
     The connecting member  13  includes an annular wall portion  131 , the valve seat portion  111  and the annular wall portion  131  are sealedly arranged, and the sealing form may be a radial sealing or an axial sealing. 
     The valve seat portion  111  includes a bottom section  1111  and a middle section  1112 , the bottom section  1111  includes the bottom opening  1115 , the bottom section  1111  is located inside the connecting member  13 , and a peripheral side of the bottom section  1111  and the annular wall portion  131  of the connecting member  13  are sealedly arranged. The middle section  1112  includes the peripheral opening  1113 , the middle section  1112  is closer to the first side portion  124  of the core body member  12  than the bottom section  1111  in a stacking direction of the core body member  12 , the middle section  1112  is located in the plate portion  121 , and the peripheral opening  1113  is in communication with the inter-plate passage  1212 . In this way, a depth of the valve core member  11  assembled to the core body member  12  is relatively deep, which is beneficial to reducing a height of the valve core member  11  protruding from the core body member  12 , and the overall structure is more compact. When the valve core member is in an open state, the communication passage  103 , the communication chamber  138 , the bottom opening  1115 , the throttle hole  1114 , the peripheral opening  1113 , the first hole passage  1211 , the inter-plate passage  1212  and the second hole passage  1213  are in communication. 
     It should be noted that the bottom section and the middle section herein are merely defined by name, and are not limited in structure. 
     The connecting member  13  includes a valve seat matching portion  132  and a drainage pipe  133 , the valve seat matching portion  132  is fixed to the valve seat portion  133 , such as by welding or other fixing methods such as by riveting. The valve seat matching portion  132  is provided with the annular wall portion  131 , and a height of the annular wall portion  131  is larger than a height of the bottom section  1111  along the stacking direction of the plates of the core body member  12 . A first groove  1116  is defined in the bottom section  1111 , the heat exchange device  1  includes a first sealing member  14 , the first sealing member  14  is located in the first groove  1116 , and the first sealing member  14  abuts against and closely cooperates with the annular wall portion  131  to realize sealing between the first sealing member  14  and the annular wall portion  131 , which effectively avoids the leakage between the bottom section  1111  and the annular wall portion  131 . 
     The valve seat matching portion  132  includes a side hole  1321 , and the side hole  1321  is closer to the first side portion  124  of the core body member  12  than the annular wall portion along the stacking direction of the plates of the core body member  12 . The side hole  1321  corresponds to the peripheral opening  1113  of the valve core member  11 . In this way, the fluid from the bottom opening  1115  of the valve core member  11 , flows in the first hole passage  1211  through the throttle hole  1114 , the peripheral opening  1113  and the side hole  1321 , and flows in the inter-plate passage  1212  in communication with the first hole passage  1211  to exchange heat with the fluid in the second flow passage. The throttling and depressurization of the refrigerant are competed inside the core body member  12 , and the connection with the subsequent heat exchange links is smooth, which reduces the factors such as gas-liquid stratification of the refrigerant after throttling and depressurization in a long pipeline from affecting the heat exchange efficiency of the subsequent heat exchange by the pipeline arrangement. 
     The connecting member  13  is fixed to the core body member  12  by welding, the core body member  12  includes a welding matching portion  125 , the welding matching portion  125  is fixed to the connecting member  13  by welding, and a thickness of the welding matching portion  125  is greater than a thickness of at least two stacked plates along an extending direction of the first hole passage  1211 . In this way, since the welding matching portion  125  has the thickness greater than two stacked plates during the welding shrinkage process of the core body member  12 , the connecting member  13  can be well welded to the welding matching portion  125  during welding, which is beneficial to stability of sealing. 
     The connecting member  13  includes a first end portion  134  and a second end portion  135 , the first end portion  134  is located in the first hole passage  1211 , the second end portion  135  of the connecting member  13  includes a welding section  1352  and an adjacent section  1351 , the welding section  1352  of the connecting member  13  is welded to the welding matching portion  125 , the adjacent section  1351  is adjacent to the welding section  1352 , the adjacent section  1351  is closer to the first end portion  134  than the welding section  1352 , an outer diameter of the welding section  1352  is smaller than or equal to an inner diameter of the welding matching portion  125 , an outer diameter of the adjacent section  1351  is smaller than or equal to the inner diameter of the welding matching portion  125 ; since the connecting member has the welding section and the adjacent section in a case that the core body member shrinks during the welding, a distance between an end, away from the valve core member, of the welding matching portion and an end, away from the valve core member, of the welding section is larger than or equal to zero, so that the welding matching portion is movable relative to the connecting member during the welding shrinkage of the core body member, and the welding between the connecting member and the core body member has good sealing performance. In addition, the outer diameter of the adjacent section  1351  may be larger than or equal to the outer diameter of the welding section  1352 , and the welding section  1352  can be reduced in diameter relative to the adjacent section  1351 , which is more beneficial to the relative movement of the plate portion relative to the connecting member during the welding. 
     The valve seat matching portion  132  includes a flange portion  1322 , and the flange portion  1322  is fixed to the core body member  12  by welding. The plates of the core body member  12  include a first plate  1214   a  and a second plate  1215   a , the first plate  1214   a  is fixed to the second plate  1215   a  by welding, a top or a bottom of the flange portion  1322  is fixed to the first plate  1214   a  by welding; or the top or the bottom of the flange portion  1322  is fixed to the second plate  1215   a  by welding. 
     The core body member  12  includes the top pressing block  122 , the flange portion  1322  is fixed to the top pressing block  122  by welding, and the valve seat portion  111  of the valve core member  11  inserts in from the third hole  1221  of the top pressing block  122 . The valve seat matching portion  132  and the plate portion  121  are fixed and limited by the flange portion  1322 . The flange portion  1322  is fixed to the top pressing block  122  of the core body member  12  when the plate portion  121  shrinks during welding, which can ensure the certainty of a position of the valve seat matching portion  132  in the core body member  12 , and reduce the risk of affecting the position of the valve seat matching portion  132  after the plates shrink and reduce the risk of fluid leakage between the valve seat matching portion  132  and the valve seat. 
     The core body member  12  includes the bottom pressing block  123 , part of the connecting member  13  inserts into the bottom pressing block  123 , the bottom pressing block  123  includes the welding matching portion  125 , the welding section  1352  is located in the bottom pressing block  123 , the welding section  1352  is located in the welding matching portion  125 , the welding section  1352  is fixed to the bottom pressing block  123  by welding, and the first end portion  134  is welded to the core body member  12  by welding. In this way, the connecting member  13  can be fixed to the core body member during the welding of the core body member, which can be completed by one-time welding, and the processing is convenient. 
     The valve seat matching portion  132  includes a bottom end portion  1328 , the drainage pipe  133  is fixed to the bottom end portion  1328  by welding, and at least part of the drainage pipe  133  inserts into the valve seat matching portion  132 ; the drainage pipe  133  includes a first portion  1331  and a second portion  1332 , at least part of the first portion  1331  inserts into the valve seat matching portion  132 , and the at least part of the first portion  1331  is fixed to the valve seat matching portion  132  by welding. The second end portion of the connecting member  13  is arranged in the second portion of the drainage pipe  133 , and part of the second portion  1332  of the drainage pipe  133  is located in the welding matching portion  125  and is fixed to the welding matching portion  125  by welding. 
     The bottom pressing block  123  includes a protrusion  1232 , the protrusion  1232  inserts into the first hole passage  1211 , the protrusion  1232  includes the communication hole  1231  in communication with the first hole passage  1211 , the welding matching portion  125  is arranged on an inner wall of the protrusion  1232 , the welding section inserts into the communication hole  1231  of the protrusion  1232 , and an outer wall of the protrusion  1232  is fixed to the plate portion  121  by welding. 
     The drainage pipe  133  includes an external expansion portion  1333 , the external expansion portion  1333  does not insert into the valve seat matching portion  132 , and the external expansion portion  1333  cooperates with the bottom end portion  1328  of the valve seat matching portion  132  for limiting. In this way, since the plate portion  121  may shrink during the welding of the core body member  12 , the drainage pipe  133  may be blocked by the external expansion portion  1333  and the bottom end portion of the valve seat matching portion  132  by providing the external expansion portion  1333  if the drainage pipe  133  moves upward toward the valve seat matching portion  132 , so that a position of the drainage pipe  133  inserting into the valve seat matching portion  132  is determined, which reduces the risk of sealing fit between the bottom section  1111  and the connecting member  13  caused by the excessive depth of the drainage pipe  133  protruding into the valve seat matching portion  132 , and reduces the influence on the flow passage between the bottom section  1111  and the drainage pipe  133 . 
     Furthermore, the flange portion  1322  includes a limiting groove  1323 , the first plate  1214   a  includes a limiting protrusion (not shown), and the limiting groove  1323  cooperates with the limiting protrusion to prevent the connecting member  13  form moving in a circumferential direction, which is beneficial to the stability of the structure and the stability of sealing. 
     Referring to  FIG.  4    and  FIG.  5   ,  FIG.  4    and  FIG.  5    are schematic structural views of a heat exchange device  2 . Although some reference numerals in  FIG.  4    are not indicated below, the reference numerals of the same parts in the above embodiment are also marked in  FIG.  4    to facilitate understanding and avoid repetition and redundancy. 
     The core body member  12  includes a third plate  1214   b  and a fourth plate  1215   b , the third plate  1214   b  is fixed to the fourth plate  1215   b  by welding, the third plate  1214   b  includes a first annular protruding portion  1219   a , the fourth plate  1215   b  includes a second annular protruding portion  1219   b , a first hole is defined in the first annular protruding portion  1219   a , a first hole is defined in the second annular protruding portion  1219   b , the first hole passage  1211  extends through the first annular protruding portion  1219   a  and the second annular protruding portion  1219   b , the first annular protruding portion  1219   a  inserts into the first hole of a plate adjacent to the third plate  1214   b , the second annular protruding portion  1219   b  inserts into the first hole of a plate adjacent to the fourth plate  1215   b , a gap is left between the first annular protruding portion  1219   a  and a wall portion of the first hole defined in the plate adjacent to the third plate  1214   b , and a gap is left between the second annular protruding portion  1219   b  and a wall portion of the first hole defined in the plate adjacent to the fourth plate  1215   b , so that the fluid can flow through an outer periphery of the first annular protruding portion  1219   a  and flow in the inter-plate passage  1212  for heat exchange. 
     The valve core member  11  includes the valve seat portion  111 , at least part of the valve seat portion  111  is located in the first hole passage  1211 , the valve seat portion  111  includes the peripheral opening  1113 , the throttle hole  1114  and the bottom opening  1115 , the peripheral opening  1113  is in communication with the first hole passage  1211 , and the bottom opening  1115  is in communication with the communication chamber  138  of the connecting member  13 . The valve core member  11  may be a valve core portion of an electronic expansion valve. 
     The valve seat portion  111  includes the bottom section  1111  and the middle section  1112 , the bottom section  1111  includes the bottom opening  1115 , the middle section  1112  includes the peripheral opening  1113 , and the middle section  1112  is closer to the first side portion  124  of the core body member  12  than the bottom section  1111  in the stacking direction of the core body member  12 . The middle section  1112  is located in the first hole passage  1211 , so that a depth of the valve core member  11  assembled to the core body member  12  is relatively deep, which is beneficial to reducing a height of the valve core member  11  protruding from the core body member  12 , and the overall structure is more compact. The first side portion  124  of the valve core member  12  refers to a side of the core body member  12  provided with the valve core member  11 . 
     At least part of the valve seat portion  111  inserts into the first annular protruding portion  1219   a , and the bottom section  1111  and the annular protruding portion  1219   a  are sealedly arranged; the first groove  1116  is defined in the bottom section  1111 , the heat exchange device  1  includes the first sealing member  14 , the first sealing member  14  is located in the first groove  1116 , and the first sealing member  14  closely cooperates with the annular protruding portion  1219   a  to realize sealing between the first sealing member  14  and the annular protruding portion  1219   a , which effectively avoids the leakage between the bottom section  1111  and the annular protruding portion  1219   a.    
     A side where the core body member  12  is provided with the valve core member  11  is defined as an upper side, and the middle section  1112  is located on the upper side of the connecting member  13 ; the fluid flows in from the bottom opening  1115 , and flows out of the peripheral opening  1113  after flowing through the throttle hole  1114 , so that the fluid that has just flowed in the core body member  12  flows out of the peripheral opening  1113  after being throttled and depressurized by the expansion valve, and flows in the inter-plate passage  1212  to exchange heat with the fluid in the second flow passage. The throttling and depressurization of the refrigerant are competed inside the core body member  12 , and the connection with the subsequent heat exchange links is smooth, which reduces the factors such as gas-liquid stratification of the refrigerant after throttling and depressurization in a long pipeline from affecting the heat exchange efficiency of the subsequent heat exchange by the pipeline arrangement. 
     The connecting member  13  includes the first end portion  134  and the second end portion  135 , and at least part of the first end portion  134  is fixed to the second annular protruding portion  1219   b  by welding. Specifically, at least part of the first end portion  134  inserts into the second annular protruding portion  1219   b , and at least part of an outer wall of the first end portion  134  is fixed to an inner wall of the second annular protruding portion  1219   b  by welding. For example, a welding ring may be provided during welding. 
     At least part of the second end portion  135  is fixed to the bottom pressing block  123  by welding, and the at least part of the second end portion  135  inserts into a position where the first hole is defined in the bottom pressing block  123 . 
     The first end portion  134  includes a first section  1341  and a second section  1342 , the first section  1341  of the first end portion  134  inserts into the second annular protruding portion  1219   b , the second section  1342  does not insert into the second annular protruding portion  1219   b , an outer diameter of the second section  1342  is greater than an outer diameter of the first section  1341 , and the outer diameter of the second section  1342  is greater than an inner diameter of the second annular protruding portion  1219   b . For example, the outer diameter of the second section  1342  may be reduced toward the first section  1341 . In this way, the plate may shrink when the stacked plates are fed into a furnace for welding, which results in a reduction in height of the stacked core body member  12 . At this time, the first end portion  134  of the connecting member is difficult to insert into the bottom opening  1115  of the bottom section  1111  during the shrinkage of the plates by providing the second section  1342 , which reduces the influence on the bottom section  1111  caused by the change in height caused by shrinkage of the connecting member  13  during the welding of the core body member  12 , is beneficial to improving the cooperation between the valve core member  11  and the core body member  12 , and is beneficial to improving the sealing between the valve core member  11  and the core body member  12  of the fluid. 
     In addition, the second end portion  135  of the connecting member  13  includes a welding section  1352  and an adjacent section  1351 , the welding section  1352  of the connecting member  13  is welded to the welding matching portion  125 , the adjacent section  1351  is adjacent to the welding section  1352 , the adjacent section  1351  is closer to the first end portion  134  than the welding section  1352 , the outer diameter of the welding section  1352  is smaller than or equal to the inner diameter of the welding matching portion  125 , and the outer diameter of the adjacent section  1351  is smaller than or equal to the inner diameter of the welding matching portion  125 ; since the connecting member has the welding section and the adjacent section in a case that the core body member shrinks during the welding, the distance between the end, away from the valve core member  11 , of the welding matching portion  125  and the end, away from the valve core member  11 , of the welding section is larger than or equal to zero, so that the welding matching portion  125  is movable relative to the connecting member  13  during the welding shrinkage of the core body member  12 , and the welding between the connecting member  13  and the core body member  12  has good sealing performance. In addition, the outer diameter of the adjacent section  1351  may be greater than or equal to the outer diameter of the welding section  1352 , and the welding section  1352  can be reduced in diameter relative to the adjacent section  1351 , which is more beneficial to the relative movement of the plate portion relative to the connecting member  13  during the welding. 
     The welding section  1352  may include a first zone section and a second zone section, the first zone section is welded to the welding matching portion  125 , the second zone section is adjacent to the first zone section, the second zone section is farther away from the first end portion than the first zone section, and an outer diameter of the second zone section is smaller than or equal to an inner diameter of the first zone section; the first zone section may not be arranged corresponding to the welding matching portion  125  when the connecting member  13  is assembled into the core body member  12 , and the first zone section moves to the welding matching portion  125  and is fixed to the welding matching portion  125  by welding when the core body member shrinks. 
     Referring to  FIG.  6   ,  FIG.  6    is a schematic cross-sectional view of a heat exchange device. In order to show the structures more clearly, the following structures may not be shown in  FIG.  6   , but reference can be made to  FIG.  2    and  FIG.  3   . Although some reference numerals in  FIG.  6    are not indicated below, the same reference numerals of the same parts in the above embodiments are also marked in  FIG.  6    to facilitate understanding and avoid repetition and redundancy. 
     The heat exchange device at least includes the first flow passage  101  and the second flow passage, the fluid in the first flow passage  101  can exchange heat with the fluid in the second flow passage; the fluid in the first flow passage  101  may be a refrigerant, and the fluid in the second flow passage may be a coolant. The heat exchange device may include a third flow passage, a fourth flow passage, and the like. 
     The heat exchange device  1  includes the valve core member  11 , the core body member  12  and the connecting member  13 , the valve core member  11  is assembled with and fixed to the core body member  12 , and the connecting member  13  is fixed to the core body member  12 , such as by welding. The valve core member  11  may be of, for example, a valve core structure of an expansion valve. 
     The core body member  12  includes the top pressing block  122 , the plate portion  121  and the bottom pressing block  123 , and the top pressing block  122 , the plate portion  121  and the bottom pressing block  123  are fixed by welding. The plate portion  121  at least includes the first hole passage  1211 , the second hole passage  1213  and the inter-plate passage  1212 , the first hole passage  1211 , the inter-plate passage  1212  and the second hole passage  1213  are in communication, and the first flow passage  101  includes part of the first hole passage  1211 , the second hole passage  1213  and the inter-plate passage  1212 . The first hole passage  1121  and the second hole passage  1213  are hole passages when the core body member  12  is not assembled with the valve core member  11 . 
     The plate portion  121  includes multiple stacked plates, adjacent plates are fixed by welding, each plate at least includes a first hole and a second hole, the first holes of the plates are aligned and the second holes of the plates are aligned along the stacking direction of the plates. The first hole and the second hole are located adjacent to the edge of the plate, so that the fluid flowing through the plate can have a relatively long flow path, which is beneficial to improving the heat exchange efficiency. The first holes of the plates are aligned to form a part of the first hole passage  1211 , and the second holes of the plates are aligned to form a part of the second hole passage  1213 . 
     The top pressing block  122  includes the third hole  1221 , the third hole  1221  is aligned with the first holes, the bottom pressing bock  123  includes the communication hole  1231 , and the communication hole  1231  is aligned with the first holes. 
     The heat exchange device includes the communication passage  103  and the another communication passage  104 , the communication passage  103  is in communication with the communication chamber  138  of the connecting member  13 , and the another communication passage  104  is in communication with the second hole passage  1213 , so that the fluid can flow in from the communication passage  103  and flow through the inner chamber of the connecting member  13 , and then flow in the inter-plate passage  1212  of the core body member  12  after being throttled by the valve core member  11  to exchange heat with the fluid in the second flow passage, which has a simple flow path and high heat exchange efficiency. Alternatively, in other cases, the another communication passage  104  may be in indirect communication with the second hole passage  1213 . For example, a pipe may be provided in the second hole passage  1213 , and the second hole passage  1213  is in communication with the another communication passage  104  through the pipe. In other cases, the another communication passage  104  may not be in communication with the inter-plate passage  1212  through the second hole passage  1213 , the another communication passage  104  may be arranged on a side, provided with the communication passage  103 , of the core body member  12 , and the another communication passage  104  may be adjacent to the communication passage  103  and not in direct communication with the communication passage  103 . 
     At least part of the valve core member  11  inserts into the first hole passage  1211 , and at least part of the connecting member  13  inserts into the first hole passage  1211 . 
     The valve core member  11  includes the valve seat portion  111 , at least part of the valve seat portion  111  is located in the first hole passage  1211 , the valve seat portion  111  includes the peripheral opening  1113 , the throttle hole  1114  and the bottom opening  1115 , the peripheral opening  1113  is in communication with the first hole passage  1211 , and the bottom opening  1115  is in communication with the communication chamber  138  of the connecting member  13 . The valve core member  11  may be a valve core portion of an electronic expansion valve. 
     The valve seat portion  111  includes the bottom section  1111  and the middle section  1112 , the bottom section  1111  includes the bottom opening  1115 , the bottom section  1111  is located inside the connecting member  13 , and the peripheral side of the bottom section  1111  and the annular wall portion  131  of the connecting member  13  are sealedly arranged. The middle section  1112  includes the peripheral opening  1113 , the middle section  1112  is closer to the first side portion  124  of the core body member  12  than the bottom section  1111  along the stacking direction of the core body member  12 , the middle section  1112  is located in the plate portion  121 , and the peripheral opening  1113  is in communication with the inter-plate passage  1212 . In this way, a depth of the valve core member  11  assembled to the core body member  12  is relatively deep, which is beneficial to reducing a height of the valve core member  11  protruding from the core body member  12 , and the overall structure is more compact. 
     The connecting member  13  includes the annular wall portion  131 , and the valve seat portion  111  and the annular wall portion  131  are sealedly arranged. A height of the annular wall portion  131  is larger than a height of the bottom section  1111  along the stacking direction of the plates of the core body member  12 . The first groove  1116  is defined in the bottom section  1111 , the heat exchange device includes the first sealing member  14 , the first sealing member  14  is located in the first groove  1116 , and the first sealing member  14  closely cooperates with the annular wall portion  131  to realize sealing between the first sealing member  14  and the annular wall portion  131 , which effectively avoids the leakage between the bottom section  1111  and the annular wall portion  131 . 
     The connecting member  13  includes a side hole  1321 , and the side hole  1321  is closer to the first side portion  124  of the core body member  12  than the annular wall portion  131  along the stacking direction of the plates of the core body member  12 . The side hole  1321  corresponds to the peripheral opening  1113  of the valve core member  11 . In this way, the fluid flows in from the bottom opening  1115  of the valve core member  11  through the drainage pipe  133 , and flows in the first hole passage  1211  through the throttle hole  1114 , the peripheral opening  1113  and the side hole  1321 , and then flows in the inter-plate passage  1212  in communication with the first hole passage  1211  to exchange heat with the fluid in the second flow passage. 
     The connecting member  13  includes the flange portion  1322 , and the flange portion  1322  is fixed to the core body member  12  by welding. The plates of the core body member  12  include the first plate  1214   a  and the second plate  1215   a , the first plate  1214   a  is fixed to the second plate  1215   a  by welding, the top or the bottom of the flange portion  1322  is fixed to the first plate  1214   a  by welding; or the top or the bottom of the flange portion  1322  is fixed to the second plate  1215   a  by welding. 
     The core body member  12  includes the top pressing block  122 , and the flange portion  1322  is fixed to the top pressing block  122  by welding. The valve seat matching portion  132  and the plate portion  121  are fixed and limited by the flange portion  1322 . The flange portion  1322  is fixed to the top pressing block  122  of the core body member  12  during the welding shrinkage of the plate portion  121 , which can ensure the certainty of the position of the connecting member  13  in the core body member  12 , and reduce the risk of affecting the position of the connecting member  13  after the plates shrink and reduce the risk of fluid leakage between the connecting member  13  and the valve seat portion  111 . 
     The core body member  12  includes the bottom pressing block  123 , part of the connecting member  13  inserts into the bottom pressing block  123 , the bottom pressing block  123  includes the welding matching portion  125 , the second end portion  135  inserts into the welding matching portion  125 , and the second end portion  135  is fixed to the bottom pressing block  123  by welding. 
     The bottom pressing block  123  includes the communication hole  1231  in communication with the first hole passage  1211 , the welding matching portion  125  is arranged on an inner wall of the communication hole  1231  of the bottom pressing block  123 , at least part of the second end portion  135  inserts into the communication hole  1231 , and a thickness of the bottom pressing block  123  is greater than a thickness of five plates. In this way, the bottom pressing block  123  can be welded to an outer wall of the connecting member  13  to ensure sealing during the welding of the core body member  12 . 
     The second end portion  135  of the connecting member  13  includes the welding section  1352  and the adjacent section  1351 , the welding section  1352  of the connecting member  13  is welded to the welding matching portion  125 , the adjacent section  1351  is adjacent to the welding section  1352 , the adjacent section  1351  is closer to the first end portion  134  than the welding section  1352 , the outer diameter of the welding section  1352  is smaller than or equal to the inner diameter of the welding matching portion  125 , and the outer diameter of the adjacent section  1351  is smaller than or equal to the inner diameter of the welding matching portion  125 ; since the connecting member has the welding section and the adjacent section in a case that the core body member shrinks during the welding, the distance between the end, away from the valve core member, of the welding matching portion and the end, away from the valve core member, of the welding section is larger than or equal to zero, so that the welding matching portion is movable relative to the connecting member during the welding shrinkage of the core body member, and the welding between the connecting member and the core body member has good sealing performance. In addition, the outer diameter of the adjacent section  1351  may be greater than or equal to the outer diameter of the welding section  1352 , and the welding section  1352  can be reduced in diameter relative to the adjacent section  1351 , which is more beneficial to the relative movement of the plate portion relative to the connecting member during the welding. 
     Referring to  FIG.  7   ,  FIG.  7    is a schematic cross-sectional view of yet another embodiment of the heat exchange device. A general structure of the heat exchange device refers to the heat exchange device shown in  FIG.  6   . Although some reference numerals in  FIG.  7    are not indicated below, the same reference numerals of the same parts in the above embodiment are also marked in  FIG.  7    to facilitate understanding and avoid repetition and redundancy. The valve body member  12  includes a fifth plate  1214   c , the fifth plate  1214   c  includes an extension portion  1217 , and the extension portion  1217  is fixed to the outer wall of the connecting member  13  by welding. The side where the core body member  12  is assembled with the valve core member  11  is an upper side, and the extension portion  1217  is located on a lower side of the middle section  1112 . 
     The first hole passage  1211  includes a first sub hole passage  1211   a  and a second sub hole passage  1211   b , and the extension portion  1217  is fixed to the outer wall of the connecting member  13  by welding to separate the first sub hole passage  1211   a  from the second sub hole passage  1211   b.    
     The valve body member  12  includes a sixth plate  1215   c , the sixth plate  1215   c  includes a blocking portion  1218 , the blocking portion  1218  is located in the second hole passage  1213 , the second hole passage  1213  includes a third sub hole passage  1213   a  and a fourth sub hole passage  1213   b , and the blocking portion  1218  separates the third sub hole passage  1213   a  from the fourth sub hole passage  1213   b.    
     The inter-plate passage  1212  includes a first route  1212   a , a second route  1212   b  and a third route  1212   c , a flow direction of the first route  1212   a  is opposite to a flow direction of the second route  1212   b , and the flow direction of the second route  1212   b  is opposite to a flow direction of the third route  1212   c ; in this way, the fluid flows in from the bottom opening  1115  after it flows in the connecting member  13  through the communication passage  103 , and then flows in the first sub hole passage  1211   a , the first route  1212   a , the third hole passage  1213   a , the second route  1212   b , the second hole passage  1211   b , the third route  1212   c  and the another communication passage  104  through the throttle hole  1114  and the peripheral opening  1113 . The fluid can realize throttling and depressurization after flowing in the heat exchange device, and the fluid flowing in the inter-plate passage  1212  from the peripheral opening  1113  can directly exchange heat with the fluid in the adjacent inter-plate passage  1212 , and the throttling and heat exchange can be completed inside the core body member  12 , which not only is beneficial to the stability of phase state of the fluid, but also is beneficial to improving the heat exchange efficiency. 
     The second end portion  135  of the connecting member  13  includes the welding section  1352  and the adjacent section  1351 , the welding section  1352  of the connecting member  13  is welded to the welding matching portion  125 , the adjacent section  1351  is adjacent to the welding section  1352 , the adjacent section  1351  is closer to the first end portion  134  than the welding section  1352 , the outer diameter of the welding section  1352  is smaller than or equal to the inner diameter of the welding matching portion  125 , and the outer diameter of the adjacent section  1351  is smaller than or equal to the inner diameter of the welding matching portion  125 ; since the connecting member has the welding section and the adjacent section in a case that the core body member shrinks during the welding, the distance between the end, away from the valve core member, of the welding matching portion and the end, away from the valve core member, of the welding section is larger than or equal to zero, so that the welding matching portion is movable relative to the connecting member during the welding shrinkage of the core body member, and the welding between the connecting member and the core body member has good sealing performance. In addition, the outer diameter of the adjacent section  1351  may be larger than or equal to the outer diameter of the welding section  1352 , and the welding section  1352  can be reduced in diameter relative to the adjacent section  1351 , which is more beneficial to the relative movement of the plate portion relative to the connecting member during the welding. 
     Along an extending direction of the first hole passage, a thickness of the welding matching portion is greater than or equal to a thickness of two stacked plates, or the thickness of the welding matching portion may be larger than or equal to the thickness of five stacked plates. 
     The welding section  1352  may include the first zone section and the second zone section, the first zone section is welded to the welding matching portion  125 , the second zone section is adjacent to the first zone section, the second zone section is farther away from the first end portion than the first zone section, and the outer diameter of the second zone section is smaller than or equal to the inner diameter of the first zone section; the first zone section may not be arranged corresponding to the welding matching portion  125  when the connecting member  13  is assembled into the core body member  12 , and the first zone section moves to the welding matching portion  125  and is fixed to the welding matching portion  125  by welding when the core body member shrinks. 
     It should be noted that the above is only an example, the extension portion  1217  may be formed by stamping integrally with the fifth plate, or may be formed by welding with the fifth plate. Alternatively, as other embodiments, the extension portion may protrude from the connecting member, or the extension portion may be welded to the connecting member. 
     It should be noted that the above embodiments are only used to illustrate the present application rather than limit the technical solutions described in the present application, for example, the definition of directionality such as “front”, “rear”, “left”, “right”, “up” and “down”. Although the present application has been described in detail herein with reference to the above embodiments, those of ordinary skill in the art should understand that the present application may still be combined, modified or equivalently replaced by those skilled in the art, and all technical solutions and its improvements that do not depart from the spirit and scope of the present application should be covered by the scope of the claims of the present application.