Heater and compressor assembly

Abstract

The invention relates to the technical field of fluid machinery, in particular to a heater and a compressor assembly. According to the heater provided by the invention, the shell main body is provided with the first cavity and the second cavity, liquid enters one of the first cavity and the second cavity through the water inlet, is heated by one side of the heating plate and then enters the other one of the first cavity and the second cavity, and then the liquid is heated by the other side of the heating plate; meanwhile, the hardness of the ceramic shell layer is high, the ceramic shell layer can further directly abut against various water path structures so as to increase the fluid heat exchange area, and the heat exchange efficiency is improved. The joint of the heating plate and the fixing plate is bonded and sealed in a glass sintering mode, and the glass sintering mode is good in high-temperature tolerance and high in pressure resistance. Therefore, the connecting gap between the heating plate and the fixing plate can be blocked, and the service life of the joint of the heating plate and the fixing plate is prolonged. A glass sintering weld joint is formed between the heating plate and the fixing plate.

Description

Technical Field

[0001] This invention relates to the field of fluid machinery technology, and more particularly to a heater and compressor assembly. Background Technology

[0002] In existing vehicle-mounted heater devices, the heating method is mostly thick-film heating. Thick-film heaters involve screen printing insulating film layers, heating resistance film, conductive dielectric film layers, and insulating film layers onto a stainless steel substrate, heating the coolant on the water channel side through the substrate. However, in existing thick-film heating technology, the heating film typically only contacts and heats one side of the water channel. The surface temperature of the heating plate is relatively high, and single-sided heat exchange cannot fully utilize the heat, resulting in low heat exchange efficiency and wasted heat. Summary of the Invention

[0003] The purpose of this invention is to provide a heater that can improve heat exchange efficiency and reduce waste heat.

[0004] Another objective of this invention is to provide a compressor assembly that connects the compressor and the heater to reduce the space occupied by the two components.

[0005] According to one aspect of the present invention, a heater is provided, the heater comprising:

[0006] A heating shell includes a fixing plate and a shell body. The shell body has an opening, and the fixing plate is fixed to the opening. The fixing plate and the shell body form a heating chamber. The side wall of the shell body is provided with a water inlet and a water outlet. The heating chamber is connected to the water inlet and the water outlet respectively.

[0007] A heating plate is inserted through and fixedly connected to the fixing plate. The heating plate includes a heating resistor and two ceramic shell layers, with the heating resistor located between adjacent ceramic shell layers.

[0008] The heating plate divides the heating chamber into a first chamber and a second chamber. The first chamber and the second chamber are connected by a connecting part. One of the first chamber and the second chamber is connected to the water inlet, and the other is connected to the water outlet. The heating plate is sintered and welded to the fixed plate glass.

[0009] As an alternative technical solution for the aforementioned heater, the ceramic outer shell layer is an aluminum nitride layer or an aluminum oxide layer.

[0010] As an alternative technical solution for the aforementioned heater, the connecting portion is disposed on the heating plate, the heating plate having a connecting hole for fluid to flow out, the connecting hole connecting the first chamber and the second chamber.

[0011] As an optional technical solution for the aforementioned heater, the connecting part includes a connecting chamber disposed within the shell body. One end of the connecting chamber is connected to the first chamber, and the other end of the connecting chamber is connected to the second chamber.

[0012] As an alternative technical solution for the aforementioned heater, the portion of the heating plate located outside the heating chamber is provided with a wiring point.

[0013] As an optional technical solution for the aforementioned heater, the heating housing further includes a rear cover, which is disposed on both sides of the fixing plate, and the fixing plate and the rear cover form a receiving cavity, with the wiring point located within the receiving cavity.

[0014] As an alternative technical solution for the aforementioned heater, the fixing plate is fixedly connected to the shell body by fasteners.

[0015] According to another aspect of the invention, a compressor assembly is provided, comprising a compressor body and a heater as described in any embodiment, wherein the housing body is fixedly connected to the compressor body.

[0016] As an optional technical solution for the above-mentioned compressor assembly, the compressor assembly further includes a controller. The second housing of the controller is disposed between the compressor body and the heater, and the two sides of the second housing are fixedly connected to the compressor body and the heater, respectively. The controller is communicatively connected to the heater and the compressor body, respectively.

[0017] As an optional technical solution for the above-mentioned compressor assembly, the compressor body includes a third housing, a moving plate, a stationary plate, an end cover, a drive motor, and a main shaft. The main shaft is driven by the drive motor. The main shaft and the drive motor are located inside the third housing. The third housing is fixedly connected to the stationary plate. A moving plate is provided between the third housing and the stationary plate. The moving plate is connected to the main shaft passing through the third housing. The stationary plate is provided with a stationary plate exhaust hole. The end cover is fixedly connected to the stationary plate and has an exhaust chamber communicating with the exhaust hole.

[0018] The above technical solution has at least the following advantages or beneficial effects:

[0019] The heater provided by this invention uses glass sintering to bond and seal the connection between the heating plate and the fixed plate. Glass sintering offers good high-temperature resistance and strong pressure resistance. This ensures that the gap between the heating plate and the fixed plate is sealed, and improves the lifespan of the connection between them. A glass sintered weld is formed between the heating plate and the fixed plate.

[0020] The heater provided by this invention has a shell body with a first chamber and a second chamber. Liquid enters one of the first and second chambers through an inlet, is heated by one side of a heating plate, and then enters the other of the first and second chambers. The liquid is then heated by the other side of the heating plate, thus undergoing secondary heating to reduce heat loss. Simultaneously, the high hardness of the ceramic shell layer allows for direct contact with various water passage structures, increasing the fluid heat exchange area and improving heat exchange efficiency. Compared to traditional thick-film heating methods, the ceramic shell layer is thinner and lighter, has higher power density, and superior thermal conductivity. The heating resistor is located between the two ceramic shell layers, which conduct the heat generated by the heating resistor. The heating plate is inserted into a fixed plate and directly into the shell body to form a double-sided water passage. This structure is simple to install and allows for rapid production.

[0021] The compressor assembly provided by the present invention has a fixed connection between the housing body and the compressor body. Compared with the related technology in which the housing body and the compressor body are set separately, the fixed connection between the two can reduce the space occupied by the two, and the connection between the housing body and the compressor body can reduce the total weight. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the heater structure in an embodiment of the present invention;

[0023] Figure 2 This is a schematic diagram of the structure after the heating plate and the fixing plate are connected in an embodiment of the present invention;

[0024] Figure 3 This is a cross-sectional view of the heater in an embodiment of the present invention;

[0025] Figure 4 This is a schematic diagram of the compressor assembly in an embodiment of the present invention;

[0026] Figure 5 This is a cross-sectional view of the compressor assembly in an embodiment of the present invention.

[0027] In the picture:

[0028] 10. Heater;

[0029] 1. Heating shell; 11. Fixing plate; 12. Shell body; 13. Water inlet; 14. Water outlet; 2. Heating plate; 21. Heating resistor; 22. Ceramic outer shell layer; 23. Wiring point; 3. Glass sintering weld; 4. Back cover; 5. Sealing element;

[0030] 20. Compressor;

[0031] 201. Third housing; 2011. Intake port; 202. Moving disc; 203. Stationary disc; 2031. Exhaust port; 204. End cover; 2041. Exhaust outlet; 205. Drive motor; 2051. Motor stator; 2052. Motor rotor; 206. Main shaft; 207. Intermediate body; 208. Eccentric wheel; 209. First bearing; 210. Second bearing; 211. Drive component; 212. Connector;

[0032] 30. Controller;

[0033] 301. Second housing; 302. Electrical connector. Detailed Implementation

[0034] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0035] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The terms "first position" and "second position" refer to two different positions. Furthermore, "above," "on top of," and "over" the first feature in relation to the second feature includes the first feature directly above and diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "under," and "below" the first feature in relation to the second feature includes the first feature directly below and diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0036] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0037] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0038] like Figures 1 to 3 As shown, this embodiment provides a heater 10, which includes a heating shell 1 and a heating plate 2. The heating shell 1 includes a fixing plate 11 and a shell body 12. The shell body 12 has an opening, and the fixing plate 11 is fixed at the opening. The fixing plate 11 and the shell body 12 form a heating chamber. The side wall of the shell body 12 is provided with a water inlet 13 and a water outlet 14. The heating chamber is connected to the water inlet 13 and the water outlet 14 respectively. The heating plate 2 passes through the fixing plate 11 and is fixedly connected to the fixing plate 11. The heating plate 2 includes a heating resistor 21 and two ceramic shell layers 22. The heating resistor 21 is located between two adjacent ceramic shell layers 22. The heating plate 2 divides the heating chamber into a first chamber and a second chamber. The first chamber and the second chamber are connected through a connecting part. In the first chamber and the second chamber, one is connected to the water inlet 13 and the other is connected to the water outlet 14. The heating plate 2 and the fixing plate 11 are glass-bonded.

[0039] The shell body 12 has a first chamber and a second chamber. Liquid enters one of the first and second chambers through the inlet 13, is heated by one side of the heating plate 2, and then enters the other of the first and second chambers. The liquid is then heated by the other side of the heating plate 2, thus undergoing secondary heating to reduce heat loss. Simultaneously, the ceramic shell layer 22 has high hardness, allowing it to directly contact various water passage structures to increase the fluid heat exchange area and improve heat exchange efficiency. Compared to traditional thick-film heating, the ceramic shell layer 22 is thinner and lighter, has higher power density, and better thermal conductivity. The heating resistor 21 is located between the two ceramic shell layers 22, and the ceramic shell layer 22 conducts the heat generated by the heating resistor 21. The heating plate 2 is inserted into the fixing plate 11, directly into the shell body 12 to form a double-sided water passage. This structure is simple to install and has a fast production cycle. The connection between the heating plate 2 and the fixing plate 11 is sealed using glass sintering, which provides good high-temperature resistance and strong pressure resistance. This ensures that the gap between the heating plate 2 and the fixed plate 11 is sealed, and improves the lifespan of the connection between the heating plate 2 and the fixed plate 11. A glass sintered weld 3 is formed between the heating plate 2 and the fixed plate 11.

[0040] The ceramic outer shell layer 22 can be an aluminum nitride layer or an aluminum oxide layer, that is, the material of the ceramic outer shell layer 22 can be aluminum nitride, aluminum oxide, etc., which can transfer the heat generated by the heating resistor 21 to the liquid, thereby accelerating heat transfer and heat conduction.

[0041] For example, the heating resistor 21 can be a tungsten wire resistor layer or a copper wire resistor layer, etc. Compared with the traditional thick film heating method, the heating plate 2 has high hardness, high thermal conductivity, good insulation performance, and a high safety factor.

[0042] In some embodiments, a connecting portion is provided on the heating plate 2, the heating plate 2 having a connecting hole for fluid to flow out, the connecting hole connecting the first chamber and the second chamber.

[0043] It is understood that the heating plate 2 is provided with a connecting hole to connect the first chamber and the second chamber. The width of the heating plate 2 is the same as the width of the heating chamber, and the length of the heating plate 2 is the same as the length of the heating chamber. In this way, the first chamber and the second chamber can be separated, while the connecting hole can connect the first chamber and the second chamber. For example, liquid enters the first chamber through the inlet 13, the first side of the heating plate 2 heats the liquid, and the heated liquid enters the second chamber through the connecting hole. The liquid entering the second chamber is heated by the second side of the heating plate 2. In this way, the heating plate 2 can heat the liquid on both sides, thereby improving the heating efficiency, reducing waste heat, and reducing the volume of the heater 10.

[0044] In other embodiments, the connecting portion includes a connecting chamber disposed within the shell body 12, one end of which is connected to the first chamber and the other end of which is connected to the second chamber.

[0045] The width of the heating plate 2 is the same as the width of the heating chamber, and the length of the heating plate 2 is less than the length of the heating chamber. This separates the first chamber and the second chamber, forming a U-shaped cavity. The liquid enters from one end of the U-shaped cavity and flows out from the other end. The heating plate 2, surrounded by the U-shaped cavity, can continuously heat the liquid as it flows, reducing waste of residual heat. The connecting chamber connects the first chamber and the second chamber. For example, the liquid enters the first chamber through the inlet 13, and the first side of the heating plate 2 heats the liquid. The heated liquid enters the second chamber through the connecting chamber, and the liquid entering the second chamber is heated by the second side of the heating plate 2. This achieves the goal of heating the liquid from both sides of the heating plate 2, thereby improving heating efficiency, reducing waste of residual heat, and reducing the volume of the heater 10.

[0046] The heating plate 2 divides the heating chamber into two parts. Fluid enters the heating chamber from the inlet 13, exchanges heat with the heating plate 2 through a U-shaped flow channel, and flows out of the heater 10 through the outlet 14, thus realizing a double-sided heat exchange structure. The heating plate 2 has the characteristic of high hardness, so different forms of water channel structures can be set in the heating chamber and directly abut against the heating plate 2 to increase the heat exchange area of ​​the water channel and improve the heat exchange efficiency. These will not be listed one by one in this invention.

[0047] In some implementations, such as Figure 2 As shown, the heating plate 2 located outside the heating chamber has a wiring point 23, which is used to connect the controller and the heating resistor 21.

[0048] Connection point 23 serves as an electrical connection interface and is electrically connected to the drive component.

[0049] like Figure 4 As shown, in some embodiments, the heating housing 1 further includes a rear cover 4, which is disposed on both sides of the fixing plate 11, and the fixing plate 11 and the rear cover 4 form a receiving cavity, with the wiring point 23 located inside the receiving cavity.

[0050] The rear cover 4 can cover the part of the heating plate 2 that is exposed to the shell body 12, so as to prevent the wiring point 23 of the heating plate 2 from being touched by other parts, which would cause the heating plate 2 to be loosely connected to the wire and affect the heating effect.

[0051] In some embodiments, the fixing plate 11 and the shell body 12 are fixedly connected by fasteners.

[0052] For example, the fixing plate 11 and the shell body 12 are fixedly connected by bolts or rivets, that is, the fasteners can be bolts or rivets, etc. Figure 1 As shown, a sealing element 5 is provided between the fixing plate 11 and the shell body 12.

[0053] During the assembly of heater 10, heating plate 2 can be directly inserted into heating housing 1 to separate the heating chamber. Heater 10 allows for double-sided heat exchange to increase heat exchange efficiency, resulting in a faster installation cycle compared to traditional heater 10 heating element installation methods. Heating plate 2 is inserted entirely into the middle of heating plate 2, and the connection between the two is sealed using glass sintering bonding. Due to its inherent characteristics, heating plate 2 has a higher maximum heat exchange temperature than traditional thick film heat exchange. The glass sintering sealing method provides better high-temperature resistance and superior pressure resistance at the sealed connection, representing an improvement over traditional sealing methods.

[0054] like Figure 4 and Figure 5 As shown, the present invention also provides a compressor assembly, which includes a compressor 20 and a heater 10 provided in any of the above embodiments, with the housing body 12 fixedly connected to the compressor 20.

[0055] Since the housing body 12 is fixedly connected to the compressor 20, compared with the related technology in which the housing body 12 and the compressor 20 are set separately, the fixed connection can reduce the space occupied by the two, and the connection between the housing body 12 and the compressor 20 can reduce the total weight.

[0056] Furthermore, the compressor assembly includes the aforementioned heater 10. The shell body 12 has a first chamber and a second chamber. Liquid enters one of the first and second chambers through the inlet 13, is heated by one side of the heating plate 2, and then enters the other of the first and second chambers. The liquid is then heated by the other side of the heating plate 2, thus undergoing secondary heating to reduce heat loss. Simultaneously, the ceramic shell layer 22 has high hardness, allowing it to directly contact various water passage structures to increase the fluid heat exchange area and improve heat exchange efficiency. Compared to traditional thick-film heating, the ceramic shell layer 22 is thinner and lighter, has higher power density, and better thermal conductivity. The heating resistor 21 is located within the ceramic shell layer 22, which conducts the heat generated by the heating resistor 21. The heating plate 2 is inserted into the fixing plate 11, directly into the shell body 12 to form a double-sided water passage. This structure is simple to install and has a fast production cycle.

[0057] like Figure 4 and Figure 5 As shown, in some embodiments, the compressor assembly further includes a controller 30, the second housing 301 of the controller 30 is disposed between the compressor 20 and the heater 10, and the two sides of the second housing 301 are fixedly connected to the compressor 20 and the heater 10 respectively, and the controller 30 is communicatively connected to the heater 10 and the compressor 20 respectively.

[0058] The compressor 20 and the heater 10 share a single controller 30 and can be electrically connected to the controller 30 simultaneously. Compared to related technologies where the compressor 20 and the heater 10 are controlled by different controllers 30, this reduces the overall size and weight of both components.

[0059] like Figure 4 and Figure 5 As shown, in some embodiments, the compressor 20 includes a third housing 201, a moving plate 202, a stationary plate 203, an end cover 204, a drive motor 205, and a main shaft 206. The main shaft 206 is driven by the drive motor 205. The main shaft 206 and the drive motor 205 are located inside the third housing 201. The third housing 201 is fixedly connected to the stationary plate 203. The moving plate 202 is disposed between the third housing 201 and the stationary plate 203. The moving plate 202 is connected to the main shaft 206 passing through the third housing 201. The stationary plate 203 is provided with a stationary plate 203 exhaust hole 2031. The end cover 204 is fixedly connected to the stationary plate 203 and has an exhaust chamber communicating with the exhaust hole 2031.

[0060] The controller 30 includes a second housing 301 and an electrical connector 302 disposed within the second housing 301. The drive motor 205 is connected to the drive component 211 to control the operation of the motor. The drive component 211 is located within the second housing 301.

[0061] The drive motor 205 includes a motor stator 2051 and a motor rotor 2052. The motor stator 2051 is thermally fixed inside the third housing 201 and electrically connected to the drive component 211 inside the second housing 301. A main shaft 206 is fitted inside the motor rotor 2052. One end of the main shaft 206 is fitted with a first bearing 209, which supports the rotation of the main shaft 206. The other end of the main shaft 206 has an intermediate body 207, which is fixedly connected to the third housing 201. A second bearing 210 is located inside the intermediate body 207 and also engages with the main shaft 206 to support its rotation. An eccentric wheel 208 is located at the end of the main shaft 206 facing the moving disk 202, and the main shaft 206 is connected to the moving disk 202 via the eccentric wheel 208. When the compressor 20 is working, the motor stator 2051 receives the electrical signal from the drive unit, driving the motor rotor 2052 to rotate the main shaft 206, eccentric wheel 208, and moving disk 202. The moving disk 202 cooperates with the stationary disk 203 fixedly connected to the intermediate body 207 or the third housing 201 to form a gradually shrinking crescent-shaped compression chamber to compress the refrigerant. The low-temperature, low-pressure refrigerant drawn in through the suction port 2011 on the third housing 201 is compressed into high-temperature, high-pressure refrigerant by the moving and stationary disks 203, and then discharged into the exhaust chamber in the end cover 204 through the exhaust port 2031 on the stationary disk 203, and finally discharged from the compressor 20 through the exhaust port 2041 in the end cover 204.

[0062] Low-temperature, low-pressure refrigerant enters the compressor 20 through the suction port 2011. After being compressed by the moving plate 202 and the stationary plate 203, it becomes high-temperature, high-pressure refrigerant and is discharged from the discharge port 2041 of the compressor 20. It then enters the condenser in the system, where it dissipates heat and becomes high-pressure liquid refrigerant. Subsequently, it enters the throttling device to reduce its pressure and finally enters the evaporator to absorb heat, becoming low-temperature, low-pressure gaseous refrigerant again before entering the compressor 20, thus completing one complete refrigeration cycle.

[0063] In the controller 30, an electrical connector 302 is provided on the second housing 301 for supplying power to the compressor 20 and the heater 10 and transmitting electrical signals. Inside the second housing 301, there is a drive component 211, which is electrically connected to the motor stator 2051. The wiring point 23 of the heating plate 2 is connected to the electrical connector 302 through a connector 212.

[0064] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A heater characterized by, The application relates to a heating shell (1) and a compressor assembly. The heating shell (1) comprises a fixed plate (11) and a shell body (12), the shell body (12) is provided with an opening, the fixed plate (11) is fixed to the opening, the fixed plate (11) and the shell body (12) form a heating cavity, the side wall of the shell body (12) is provided with a water inlet (13) and a water outlet (14), and the heating cavity is communicated with the water inlet (13) and the water outlet (14) respectively. A heating plate (2) is arranged in the fixed plate (11) and fixedly connected with the fixed plate (11), the heating plate (2) comprises a heating resistor (21) and two layers of ceramic shell layers (22), and the heating resistor (21) is located between the two layers of ceramic shell layers (22). The heating plate (2) divides the heating cavity into a first cavity and a second cavity, the first cavity and the second cavity are communicated through a communication part, one of the first cavity and the second cavity is communicated with the water inlet (13), and the other is communicated with the water outlet (14), and the heating plate (2) and the fixed plate (11) are glass sintered and welded.

2. The heater of claim 1, wherein The ceramic shell layer (22) is an aluminum nitride layer or an aluminum oxide layer.

3. The heater according to claim 1 or 2, characterized in that, The communication part is arranged on the heating plate (2), the heating plate (2) is provided with a communication hole for fluid outflow, and the communication hole communicates the first cavity and the second cavity.

4. The heater according to claim 1 or 2, characterized by The communication part comprises a communication cavity, the communication cavity is arranged in the shell body (12), one end of the communication cavity is communicated with the first cavity, and the other end of the communication cavity is communicated with the second cavity.

5. The heater according to claim 1 or 2, characterized by The part of the heating plate (2) located outside the heating cavity is provided with a wiring point (23).

6. The heater of claim 5, wherein, The heating shell (1) further comprises a rear cover (4), the rear cover (4) and the shell body (12) are arranged on the two sides of the fixed plate (11) respectively, the fixed plate (11) and the rear cover (4) form an accommodating cavity, and the wiring point (23) is located in the accommodating cavity.

7. The heater according to claim 1 or 2, characterized by The fixed plate (11) and the shell body (12) are fixedly connected through fasteners.

8. A compressor assembly characterized by, The compressor assembly further comprises a controller (30), a second shell (301) of the controller (30) is arranged between the compressor (20) and the heater (10), the two sides of the second shell (301) are fixedly connected with the compressor (20) and the heater (10) respectively, and the controller (30) is in communication connection with the heater (10) and the compressor (20) respectively.

9. The compressor assembly of claim 8, wherein, ​ 10. The compressor assembly of claim 8 or 9, wherein, The compressor (20) comprises a third shell (201), a moving disc (202), a static disc (203), an end cover (204), a driving motor (205) and a main shaft (206), the main shaft (206) is driven by the driving motor (205), the main shaft (206) and the driving motor (205) are located in the third shell (201), the third shell (201) is fixedly connected with the static disc (203), a moving disc (202) is arranged between the third shell (201) and the static disc (203), the moving disc (202) is connected with the main shaft (206) penetrating through the third shell (201), the static disc (203) is provided with an exhaust hole (2031), the end cover (204) is fixedly connected with the static disc (203), and the end cover (204) has an exhaust cavity in communication with the exhaust hole (2031).

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