Patent Publication Number: US-11661940-B2

Title: Scroll compressor having cooling pipe moving synchronously with orbiting scroll and rotating with respect to crankshaft

Description:
CROSS REFERENCE TO RELATED APPLICATION 
     The present application claims priority to Chinese Patent Application with No. 201811490258.9, entitled “Compressor”, and filed on Dec. 6, 2018, the content of which is expressly incorporated herein by reference in its entirety. This application is a U.S. national phase of International Application No. PCT/CN2019/107557, entitled “Compressor” filed on Sep. 24, 2019, published as WO 2020/114044 A1 on Jun. 11, 2020. Every patent application and publication listed in this paragraph is hereby incorporated by reference in its entirety. 
     TECHNICAL FIELD 
     The present disclosure relates to the field of air compression technology, and particularly to a compressor. 
     BACKGROUND 
     The maximum working pressure of the oil-free air scroll compressor is approximately 1.0 MPa, the pressure ratio reaches 10. When an air-cooled device is employed to cool the orbiting and stationary scrolls, and the exhaust temperature at the maximum working pressure reaches 170° C. There is a sealing groove provided on the top of the orbiting and stationary scrolls, and a sealing component are provided inside the sealing groove. The sealing component is required to have higher temperature resistance. The material of the sealing component is required to withstand a high temperature of 200° C. or more, and meanwhile have good wear resistance. During the operation of the compressor, the sealing component is liable to melt at a high temperature, which makes the whole machine unable to pump air. 
     SUMMARY 
     In view of this, the technical problem to be solved by the present disclosure is to provide a compressor capable of effectively reducing the temperature at the sealing component. 
     In order to address the above technical problem, a compressor is provided, which includes an orbiting scroll, a cooling pipe and a crankshaft, the cooling pipe passes through the crankshaft, and a part of the cooling pipe is arranged in a sealing portion of the orbiting scroll, the cooling pipe moves synchronously with the orbiting scroll and rotates with respect to the crankshaft. 
     In some embodiments, a pressure difference is formed between an inlet and an outlet of the cooling pipe, such that a coolant liquid flows from the inlet through the sealing portion and out of the outlet. 
     In some embodiments, an axial through hole is provided in a center of the orbiting scroll, the sealing portion of the orbiting scroll is provided with a sealing groove, the crankshaft is provided with a mounting hole, the sealing groove is in communication with the mounting hole through the axial through hole, the cooling pipe enters a tail portion of the crankshaft, and passes through the mounting hole, the axial through hole and the sealing groove, and then returns back on the same way and extends from the tail portion of the crankshaft. 
     In some embodiments, an eccentric amount of the mounting hole with respect to a central axis of the crankshaft is equal to an eccentric amount of the orbiting scroll with respect to the central axis of the crankshaft. 
     In some embodiments, the mounting hole is a round hole, and/or, the axial through hole is a round hole. 
     In some embodiments, the sealing portion further includes a sealing component arranged in the sealing groove, a mounting groove configured to mount the cooling pipe is formed between the sealing component and the sealing groove, and the cooling pipe is in contact with the sealing component. 
     In some embodiments, a width of the mounting groove is greater than a diameter of the cooling pipe and less than 1.5 times the diameter of the cooling pipe. 
     In some embodiments, the mounting groove is a rectangular groove or an elliptical groove, and an inlet pipe and an outlet pipe of the cooling pipe are arranged side by side in the mounting groove. 
     In some embodiments, a tail portion of the sealing groove is bent in an arc shape. 
     In some embodiments, the compressor further includes a coolant liquid tank, the coolant liquid tank includes a first cavity and a second cavity separated by a partition plate, the partition plate is provided with a throttle hole, the first cavity is in communication with the second cavity through the throttle hole, the outlet of the cooling pipe extends into the first cavity, the inlet of the cooling pipe extends into the second cavity, the outlet of the cooling pipe is lower than the inlet of the cooling pipe, and the inlet and the outlet of the cooling pipe are capable of simultaneously extending below a liquid level. 
     In some embodiments, the outlet of the cooling pipe is located below the liquid level in the first cavity, the crankshaft has a first rotation angle making the inlet of the cooling pipe located below the liquid level in the second cavity and a second rotation angle making the inlet of the cooling pipe located above the liquid level in the second cavity. 
     In some embodiments, a top of the first cavity is provided with a connection port, the first cavity is in communication with an exhaust pressure through the connection port, and/or, a top of the second cavity is provided with an opening, the second cavity is in communication with atmosphere through the opening. 
     In some embodiments, a bottom end of the partition plate is provided with a communication port connecting the first cavity and the second cavity. 
     In some embodiments, the cooling pipe is a flexible pipe. 
     In some embodiments, the cooling pipe in the mounting hole is sheathed with a protective sleeve. 
     In some embodiments, the inlet pipe and outlet pipe of the cooling pipe are respectively sheathed with the protective sleeves, the protective sleeve outside the inlet pipe extends to a pendulous section of the inlet pipe, and the protective sleeve outside the outlet pipe extends to a pendulous section of the outlet pipe. 
     The compressor provided by the present disclosure includes an orbiting scroll, a cooling pipe and a crankshaft; the cooling pipe passes through the crankshaft, and a part of the cooling pipe is arranged in the sealing portion of the orbiting scroll; the cooling pipe moves synchronously with the orbiting scroll and rotates with respect to the crankshaft. The cooling pipe is arranged in the sealing portion of the orbiting scroll of the compressor, thus the sealing component of the sealing portion can be cooled more effectively by the cooling pipe located in the sealing portion, and the cooling effect is better, thereby preventing the sealing components of the orbiting and stationary scrolls from being easy to wear and melt when operating in a higher temperature environment, and accordingly effectively prolonging the service life of the sealing component and improving the overall reliability. At the same time, because the cooling pipe can move synchronously with the orbiting scroll and rotate with respect to the crankshaft, the arrangement of the cooling pipe in the orbiting scroll can be implemented smoothly without affecting the operation of the orbiting scroll, and meanwhile the orbiting scroll can be cooled more fully, which effectively solves the problem in the prior art that the arrangement of the cooling water pipe in the orbiting scroll is difficult to implement due to the limitation of the motion state of the orbiting scroll. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG.  1    is a cross-sectional view of a compressor in a first state according to some embodiments of the present disclosure. 
         FIG.  2    is an enlarged structure diagram of a portion A in  FIG.  1   . 
         FIG.  3    is a partial enlarged view illustrating an end of a crankshaft of the compressor in  FIG.  1   . 
         FIG.  4    is a cross-sectional view of a compressor in a second state according to some embodiments of the present disclosure. 
         FIG.  5    is a three-dimensional structure diagram of an orbiting scroll of a compressor according to some embodiments of the present disclosure. 
         FIG.  6    is a schematic structure diagram of a part of a cooling pipe of a compressor in an orbiting scroll according to some embodiments of the present disclosure. 
     
    
    
     Reference signs are provided as follows:
           1 , orbiting scroll;  2 , bracket;  3 , crankshaft;  32 , tail portion of the crankshaft;  34 , eccentric portion of the crankshaft;  4 , drive motor;  5 , coolant tank;  6 , partition plate;  7 , connection port;  8 , opening;  9 , inlet pipe;  10 , outlet pipe;  11 , sealing component;  12 , throttle hole;  13 , first cavity;  14 , second cavity;  15 , sealing groove;  152 , tail portion of the sealing groove;  16 , axial through hole;  17 , mounting hole;  18 , mounting groove;  19 , communication port; w, width of the mounting groove; d, diameter of the cooling pipe.       

     DETAILED DESCRIPTION 
     Referring to  FIGS.  1  to  6    in combination, according to the embodiments of the present disclosure, the compressor and a part of the cooling pipe are arranged in the sealing portion of the orbiting scroll  1 , and the cooling pipe moves synchronously with the orbiting scroll  1  and rotates with respect to the crankshaft  3 . 
     The cooling pipe is arranged in the sealing portion of the orbiting scroll  1  of the compressor. Therefore, the sealing component  11  of the sealing portion can be cooled more effectively by the cooling pipe located in the sealing portion, and the cooling effect is better, thereby preventing the sealing components of the orbiting and stationary scrolls from being easy to wear and melt when operating in a higher temperature environment, and accordingly effectively prolonging the service life of the sealing component  11  and improving the overall reliability. At the same time, because the cooling pipe can move synchronously with the orbiting scroll  1  and rotate with respect to the crankshaft  3 , the arrangement of the cooling pipe in the orbiting scroll  1  can be implemented smoothly without affecting the operation of the orbiting scroll, and meanwhile the orbiting scroll can be cooled more fully, which effectively solves the problem in the prior art that the arrangement of the cooling water pipe in the orbiting scroll  1  is difficult to implement due to the limitation of the motion state of the orbiting scroll  1 . In this embodiment, a central axis of the crankshaft  3  is arranged horizontally. 
     The compressor further includes a bracket  2  and a drive motor  4 . The bracket  2  provides a support structure for the installation of the crankshaft  3 . The drive motor  4  is connected to the crankshaft  3  in a drivable mode to drive the crankshaft  3  to rotate, and then the crankshaft  3  drives the orbiting scroll  1  to move in translation, such that a space between the orbiting scroll  1  and the stationary scroll is continuously squeezed and changed to implement the compression of air. 
     In this embodiment, a pressure difference is formed between an inlet and an outlet of the cooling pipe, so that the coolant liquid flows from the inlet through the sealing portion and out of the outlet. By forming the pressure difference between the inlet and the outlet of the cooling pipe, the coolant liquid can be pressed from the inlet to the outlet under the action of the pressure difference, so that the flow of the cooling liquid can be directly implemented by using the action of the pressure difference without needing to add the cooling water circulation pump. Accordingly, the sealing component  11  of the orbiting scroll can be effectively sealed, and the structure of the whole machine is simpler and easier to implement. 
     In this embodiment, an axial through hole  16  is provided at the center of the orbiting scroll  1 , a sealing groove  15  is provided in the sealing portion of the orbiting scroll  1 , a mounting hole  17  is provided on the crankshaft  3 , and the sealing groove  15  is in communication with the mounting hole  17  through the axial through hole  16 ; the cooling pipe enters from the tail portion  32  of the crankshaft  3 , passes through the mounting hole  17 , the axial through hole  16  and the sealing groove  15 , and then returns back on the same way, and extends from the tail portion  32  of the crankshaft  3 . 
     In this embodiment, the arrangement path of the cooling pipe on the orbiting scroll  1  is the same as the structure of the sealing groove  15  on the orbiting scroll  1 , for example, a spiral shape. At this time, the cooling pipe is also arranged in the spiral shape, so as to ensure that the cooling pipe can fully distributed at various positions in the sealing groove  15  of the orbiting scroll  1 , accordingly the sealing component  11  of the orbiting scroll  1  is cooled more effectively, the temperature of the sealing component  11  during operation is reduced, and the service life of the sealing component  11  is effectively increased. 
     In some embodiments, an eccentric amount of the mounting hole  17  relative to the central axis of the crankshaft  3  is the same as an eccentric amount of the orbiting scroll  1  relative to the central axis of the crankshaft  3 , and the mounting hole  17  is arranged coaxially with an eccentric portion  34  of the crankshaft. Such structure can ensure that the cooling pipe is arranged inside the mounting hole  17  of the crankshaft  3  and that the cooling pipe has no movement with respect to the orbiting scroll  1 . During the rotation of the crankshaft  3 , the orbiting scroll  1  does not rotate in translation. The eccentric portion  34  of the crankshaft rotates on its own and revolves around the central axis of the crankshaft  3 . The cooling pipe rotates with respect to the eccentric portion  34  of the crankshaft and moves in translation under the driving of the eccentric portion  34  of the crankshaft. Since the eccentric portion  34  of the crankshaft and the orbiting scroll  1  only relatively rotate, the cooling pipe that only rotates with respect to the eccentric portion  34  of the crankshaft can move in translation with the orbiting scroll  1 , so that the cooling pipe can be arranged in the orbiting scroll  1 . 
     In this embodiment, the cooling pipe is a water pipe that enters the mounting hole  17  from a tail portion of the crankshaft  3 , and then passes through the axial through hole  16  to enter the sealing groove  15 , and is arranged along the structure of the sealing groove  15 . After reaching the tail portion  152  of the sealing groove  15 , the water pipe returns back on the same way and enters the mounting hole  17  again through the axial through hole  16 , and then passes through the mounting hole  17  to extend from the tail portion  32  of the crankshaft, thereby implementing the arrangement of the cooling pipe. 
     In some embodiments, the mounting hole  17  is a round hole; and/or, the axial through hole  16  is a round hole, so as to facilitate the arrangement of the cooling pipe in the mounting hole  17  and the axial through hole  16  without affecting the rotation of the cooling pipe with respect to the crankshaft  3 , and the rotation resistance is smaller. 
     In this embodiment, the sealing portion further includes a sealing component  11  arranged in the sealing groove  15 . A mounting groove  18  configured to mount the cooling pipe is formed between the sealing component  11  and the sealing groove  15 , and the cooling pipe is in contact with the sealing component  11 . The sealing component  11  of the orbiting scroll  1  is fastened on the inlet pipe  9  and the outlet pipe  10  arranged side by side; an inner side wall of the sealing component  11  is in contact with the cooling pipe, and an outer side wall of the sealing component  11  is in contact with the sealing groove  15 , so as to implement effective heat exchange with the cooling pipe, and improve the heat exchange efficiency of the sealing component  11 . Since the cooling pipe is directly in contact with the sealing component  11 , the temperature of the sealing component  11  can be lowered more effectively. 
     In some embodiments, the width w of the mounting groove  18  in the axial direction of the orbiting scroll  1  is greater than or equal to the diameter d of the cooling pipe and less than 1.5 times the diameter d of the cooling pipe, so that the inlet pipe  9  and the outlet pipe  10  of the cooling pipe are capable of being arranged along the radial direction of the orbiting scroll as much as possible, rather than being arranged along the axial direction, accordingly both the inlet pipe  9  and the outlet pipe  10  can be in contact with the sealing component  11  as much as possible to further improve the cooling efficiency of the cooling pipe on the sealing component  11 . In some embodiments, the width w of the mounting groove is equal to a diameter of the cooling pipe, so that the inlet pipe  9  and the outlet pipe  10  can be fully in contact with the sealing component  11  to form a more effective cooling effect. 
     In this embodiment, the mounting groove  18  is a rectangular groove or an elliptical groove; the inlet pipe  9  and the outlet pipe  10  of the cooling pipe are arranged side by side in the mounting groove  18 , so that the inlet pipe  9  and the outlet pipe  10  can be arranged along a contact surface of the sealing component  11  as much as possible, to implement full contact with the sealing component  11 . 
     In some embodiments, the tail portion  152  of the sealing groove  15  is bent in an arc shape, so that the cooling pipe can be bent back along the arc shape at the tail portion  152  of the sealing groove  15  of the orbiting scroll  1 , thereby reducing the adverse effect of the change in the flow direction of the coolant liquid on the flow of the coolant liquid as much as possible, and accordingly improving the flow efficiency and the cooling effect of the coolant liquid. 
     In this embodiment, the compressor further includes a coolant liquid tank  5 . The coolant liquid tank  5  includes a first cavity  13  and a second cavity  14  separated by a partition plate  6 ; and the partition plate  6  is provided with a throttle hole  12 . The first cavity  13  is in communication with the second cavity  14  through the throttle hole  12 ; the outlet of the cooling pipe extends into the first cavity  13 ; the inlet of the cooling pipe extends into the second cavity  14 ; and the outlet of the cooling pipe is lower than the inlet of the cooling pipe, and the inlet and outlet of the cooling pipe can simultaneously extend below the liquid level. 
     In some embodiments, a communication port  19  is provided at the bottom of the partition plate  6 ; and the first cavity  13  is in communication with the second cavity  14  through the communication port  19 . 
     Since the outlet of the cooling pipe is lower than the inlet of the cooling pipe, when the inlet and outlet of the cooling pipe simultaneously extend below the liquid level, a siphon phenomenon is formed for the coolant liquid in the first cavity  13  and the second cavity  14  through the cooling pipe, so that the coolant liquid can flow from the first cavity  13  to the second cavity  14  through the cooling pipe. During the flow of the coolant liquid, the heat on the sealing component  11  of the orbiting scroll  1  is taken away, thereby effectively performing the heat dissipation on the sealing component  11 . 
     In this embodiment, when liquid level in the second cavity  14  drops below a certain height, the outlet of the cooling pipe is always below the liquid level in the first cavity  13 ; the crankshaft  3  has a first rotation angle which makes the inlet of the cooling pipe below the liquid level in the second cavity  14  and a second rotation angle which makes the inlet of the cooling pipe above the liquid level in the second cavity  14 . Since the cooling pipe can rotate with respect to the crankshaft  3  and the cooling pipe is eccentrically arranged relative to the crankshaft  3 , the cooling pipe rises and falls repeatedly with the rotation of the crankshaft  3  during the rotation of the crankshaft  3 . Therefore, when the liquid level in the second cavity  14  is lowered to a certain height under the siphoning, and when the cooling pipe rotates to the very bottom, a pipe orifice of the inlet pipe  9  of the cooling pipe extends below the liquid level; and when the cooling pipe rotates to the highest point, the pipe orifice of the inlet pipe  9  of the cooling pipe extends out of the liquid level. At this time, the coolant liquid has two states of movement, when the pipe orifice of the inlet pipe  9  of the cooling pipe extends out of the liquid level, since the gas pressure in the first cavity  13  is higher than the gas pressure in the second cavity  14  and the two ends of the cooling pipe cannot form a siphon, the coolant liquid flows backwards through the outlet pipe  10  and the inlet pipe  9  to the second cavity  14  under the action of the gas pressure in the first cavity  13 ; when the pipe orifice of the inlet pipe  9  of the cooling pipe extends below the liquid level, the inlet pipe  9  and the outlet pipe  10  both extend below the liquid level, and the liquid level in the second cavity  14  is higher than the liquid level in the first cavity  13 , the pipe orifice of the inlet pipe  9  is higher than the pipe orifice of the outlet pipe  10 , accordingly a siphon phenomenon can be formed, such that the coolant liquid flows to the first cavity  13  through the inlet pipe  9  and the outlet pipe  10 . Therefore, in the above process, the coolant liquid can also keep flowing, and cool the orbiting scroll  1  during the flowing. 
     For example, a coordinate system is established with a center of a cross section of the crankshaft as an origin. The coordinate system is divided into four quadrants. When the crankshaft rotates to a range of 45° to 135°, the pipe orifice of the cooling pipe  9  is higher and extends above the liquid level. When the crankshaft rotates to a range of 0° to 45° and a range of 135° to 360°, the pipe orifice of the cooling pipe  9  is lower and extends below the liquid level. At this time, it can be considered that the second rotation angle is formed when the crankshaft rotates to the range of 450 to 135°; and the first rotation angle is formed when the crankshaft rotates to the range of 0° to 45° and the range of 135° to 360°. 
     Since the eccentric amount of the orbiting scroll  1  with respect to the crankshaft  3  is actually smaller, the influence of the eccentric amount on the change in the height of the pipe orifice of the inlet pipe  9  during the rotation of the crankshaft  3  can also be ignored; and it is considered that the pipe orifice of the inlet pipe  9  is always below the liquid level in the second cavity  14  during the entire cooling cycle of the coolant liquid. 
     In some embodiments, the top of the first cavity  13  is provided with a connection port  7 , and the first cavity  13  is in communication with the exhaust pressure through the connection port  7 ; and/or, the top of the second cavity  14  is provided with an opening  8 , and the second cavity  14  is in communication with the atmosphere through the opening  8 . 
     When the compressor does not operate or in a stop gap, since both the first cavity  13  and the second cavity  14  are in communication with the atmosphere, the liquid levels in the two cavities can be balanced. When the liquid level is stable, the height of liquid level in the first cavity  13  is the same as the height of the liquid level in the second cavity  14 . 
     During the operation of the compressor, the exhaust pressure is introduced into the first cavity  13  through the connection port  7 . The pressure in the first cavity  13  gradually increases due to the partition of the partition plate  6  and the throttling effect of the throttle hole  12 . The second cavity  14  is in communication with the atmosphere through the opening  8 ; the liquid level in the first cavity  13  decreases, the liquid level in the second cavity  14  rises, the outlet pipe  10  extends into the liquid in an initial state, and the inlet pipe  9  is exposed in the air; since the pressure in the first cavity  13  increases, when the pressure in the first cavity  13  reaches a certain value, the coolant liquid can be forced to enter from the outlet pipe  10  and flow out of the inlet pipe  9 , this moment the liquid fills the entire cooling pipe. 
     When the liquid level in the second cavity  14  is higher than the liquid level in the first cavity  13  by a certain value, the sum of the gas pressure and the liquid pressure in the first cavity  13  and the sum of the gas pressure and the liquid pressure in the second cavity  14  tends to balance. When the two sums reach equilibrium and the liquid levels are stable, the liquid level in the first cavity  13  is lower, and the liquid level in the second cavity  14  is higher. During the rotation of the crankshaft  3 , the inlet pipe  9  is immersed in the higher liquid level in the second cavity  14 . By using the siphon principle, the cooling water enters from the inlet pipe  9  and flows out of the outlet pipe  10 , accordingly the circulation of the cooling water is implemented. In some embodiments, due to the existence of the throttle hole  12 , the gas in the first cavity  13  always flows toward the second cavity  14  with a lower pressure, such that the sum of the gas pressure and liquid pressure in the first cavity  13  and the sum of the gas pressure and liquid pressure in the second cavity  14  always tend to balance. When the sum of the gas pressure and liquid pressure in the first cavity  13  and the sum of the gas pressure and liquid pressure in the second cavity  14  reach equilibrium, this moment due to the existence of the liquid level difference, the coolant liquid continues to flow from the second cavity  14  into the first cavity  13  through the cooling pipe, to cool the sealing component  11  of the orbiting scroll  1 , and then the gas pressure in the second cavity  14  continues to rise to make the sum of the gas pressure and liquid pressure in the first cavity  13  and the sum of the gas pressure and liquid pressure in the second cavity  14  reach equilibrium again, so that the coolant liquid can always flow toward the first cavity  13  with a lower liquid level under the siphoning. 
     When the stop gap of the compressor is reached, both the first cavity  13  and the second cavity  14  are in communication with the atmosphere, such that the liquid levels in the two cavities can be balanced again, thereby implementing the circulation flow cooling of the coolant liquid. 
     Since the crankshaft  3  can rotate in a range of 360°, when the liquid level drops below a certain height during the rotation of the crankshaft  3 , the cooling pipe moves up and down with the eccentric portion  34  of the crankshaft  3 . In some embodiments, the cooling pipe extends below the liquid level in the second cavity  14  or above the liquid level in the second cavity  14  with different heights of the eccentric portion  34  of the crankshaft, accordingly the cooling pipe is continuously located below the liquid level in the second cavity  14  within a certain angle range of the rotation of the crankshaft  3 . In this process, the inlet pipe  9  and outlet pipe  10  of the cooling pipe can form a siphon phenomenon between the coolant liquids in the first cavity  13  and the second cavity  14 , thereby implementing the flow inside the pipe. 
     In some embodiments, the cooling pipe is a flexible pipe, which is more convenient to implement the cooling pipe according to the structure of the sealing component  11  of the orbiting scroll  1 , which reduces the difficulty in arranging the cooling pipe and improves the cooling effect of the cooling pipe on the sealing component  11 . 
     In some embodiments, the cooling pipe inside the mounting hole  17  is sheathed with a protective sleeve. Since the cooling pipe rotates relative to the mounting hole  17 , a rotational friction is generated between the cooling pipe and the mounting hole  17 , which can easily cause wear to the cooling pipe and reduce the service life of the cooling pipe. By arranging a protective sleeve outside the cooling pipe, the cooling pipe can be protected by the protective sleeve, thereby avoiding the friction between the cooling pipe and the mounting hole  17  and extending the service life of the cooling pipe. 
     In some embodiments, the inlet pipe  9  and the outlet pipe  10  of the cooling pipe are respectively sheathed with protective sleeves; the protective sleeve outside the inlet pipe  9  extends to a pendulous section of the inlet pipe  9 , and the protective sleeve outside the outlet pipe  10  extends to a pendulous section of the outlet pipe  10 . By controlling the length of the protective sleeve, the pendulous sections of the inlet pipe  9  and the outlet pipe  10  can be conveniently adjusted to appropriate positions, which makes it easier to implement the arrangement of the cooling pipe, and meanwhile prevents the structure of the crankshaft  3  from causing damage to the structure of the cooling pipe, such that it is easier for the cooling pipe to implement the flow and circulation of the coolant liquid between the first cavity  13  and the second cavity  14 . 
     In the above-mentioned embodiments of the present disclosure, the direct contact between the cooling pipe and the sealing component  11  can reduce the temperature of the sealing component  11 , thereby improving the reliability of the sealing component  11 . Since the cooling pipe in the present disclosure uses the siphon principle to implement the circulation flow of the cooling water, there is no need to add a circulating pump separately, and the structure of the whole machine is simpler. 
     It is easy for those skilled in the art to understand that, on the premise of no conflict, the above advantageous modes can be freely combined and superimposed. 
     The above embodiments are merely preferred embodiments of the present disclosure, and are not intended to limit the disclosure. Any modification, equivalent replacement and improvement made within the spirit and principle of the present disclosure shall fall within the protection scope of the present disclosure. The above are merely the preferred embodiments of the present disclosure. It should be pointed out that those of ordinary skill in the art can make several improvements and variations without departing from the technical principles of the present disclosure, and these improvements and variations should also be regarded as in the scope of protection of the present disclosure.