Heater and compressor assembly

Abstract

The invention relates to the technical field of fluid machinery, in particular to a heater and a compressor assembly, a ceramic heating plate is arranged on a heat conducting plate through nickel plating, reflow soldering and the like, heat is transferred to a containing space of the heater through the heat conducting plate, and the situation that the ceramic heating plate directly makes contact with fluid, boiling is generated, and consequently the heat exchange efficiency is reduced is avoided. The combination mode of nickel plating bottom welding can enable the ceramic heating plate and the heat conduction plate to be combined more tightly, heat loss is small during heat conduction, and heat exchange efficiency is not affected.

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] Ceramic heating plates typically consist of a ceramic outer shell with a sintered tungsten wire resistance layer in the middle. They offer advantages such as high shell hardness, high thermal conductivity, good insulation, and a high safety factor. However, due to their high power density, if ceramic heating plates are placed directly in a water circuit for heat exchange with the fluid, the fluid will rapidly boil and generate bubbles on the ceramic plate surface. This reduces the contact area between the ceramic heating plate and the water circuit, affecting heat exchange efficiency. Summary of the Invention

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

[0004] According to one aspect of the present invention, a heater is provided, the heater comprising:

[0005] A first housing forms a receiving space, the receiving space has a fluid flow channel, the first housing has an opening, an outlet and an inlet, and the receiving space is connected to the inlet and the outlet;

[0006] A heating structure is provided at the opening and blocks the opening. The heating structure includes a heat-conducting plate and a ceramic heating plate. The ceramic heating plates are arranged at intervals on the side of the heat-conducting plate away from the opening. The ceramic heating plates are connected to the heat-conducting plate by a nickel-plated solder layer.

[0007] As an optional technical solution for the heater described above, the heat-conducting plate is provided with a bearing boss protruding from the ceramic heating plate, the number of bearing bosses being the same as the number of ceramic heating plates, and each bearing boss being provided with one ceramic heating plate.

[0008] As an alternative technical solution for the aforementioned heater, along the direction perpendicular to the thickness of the heat-conducting plate, the projection of the ceramic heating plate onto the heat-conducting plate is located within the area enclosed by the projection of the supporting boss onto the heat-conducting plate.

[0009] As an alternative technical solution for the aforementioned heater, a sealing strip is provided between the first housing and the heat-conducting plate.

[0010] As an optional technical solution for the aforementioned heater, the ceramic heating plate includes a ceramic outer shell layer and a heating resistance layer, wherein there are two ceramic outer shell layers, and the heating resistance layer is located between the two ceramic outer shell layers.

[0011] As an optional technical solution for the aforementioned heater, the number of ceramic heating plates is two or more, and each ceramic heating plate has a wiring point.

[0012] As an alternative technical solution for the aforementioned heater, the ceramic heating plates are arranged in multiple rows along the length of the heat-conducting plate, with each row containing multiple ceramic heating plates of the same quantity.

[0013] As an alternative technical solution for the aforementioned heater, the number of ceramic heating plates is an even number.

[0014] According to another aspect of the invention, a compressor assembly is provided, comprising a compressor and a heater as described in any embodiment, wherein a first housing is fixedly connected to the compressor.

[0015] 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 and the heater, and both sides of the second housing are fixedly connected to the compressor and the heater, respectively. The controller is communicatively connected to the heater and the compressor, respectively.

[0016] As an optional technical solution for the above-mentioned compressor assembly, the compressor 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 disposed 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.

[0017] The above technical solution has at least the following advantages or beneficial effects:

[0018] Two or more ceramic heating plates are mounted on a heat-conducting plate using methods such as nickel plating and reflow soldering. Heat is transferred to the heater's containment space through the heat-conducting plate, avoiding direct contact between the ceramic heating plates and the fluid, which could cause boiling and reduce heat exchange efficiency. The nickel-plated bottom soldering method ensures a tighter bond between the ceramic heating plates and the heat-conducting plate, with minimal heat loss during heat conduction, thus not affecting heat exchange efficiency.

[0019] Meanwhile, the number of ceramic heating plates is two or more, so the ceramic heating plate provided by the present invention is smaller in size compared to a large, complete ceramic heating plate. The smaller ceramic heating plate has a lower cost than a large, complete ceramic heating plate, and because its power density is high enough, it can output sufficient heating power by being evenly arranged on the heat-conducting plate, and the fluid is heated more evenly by the heat-conducting plate. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the heater structure in an embodiment of the present invention;

[0021] Figure 2 This is an exploded view of the heater in an embodiment of the present invention;

[0022] Figure 3 This is a partial cross-sectional view of the heating structure in an embodiment of the present invention;

[0023] Figure 4 This is a schematic diagram of the compressor assembly in an embodiment of the present invention;

[0024] Figure 5 This is a cross-sectional view of the compressor assembly in an embodiment of the present invention.

[0025] In the picture:

[0026] 10. Heater;

[0027] 1. First housing; 11. Outlet; 12. Inlet; 13. Sealing groove; 2. Heating structure; 21. Heat-conducting plate; 22. Ceramic heating plate; 221. Wiring point; 222. Ceramic outer shell layer; 223. Heating resistor layer; 23. Supporting boss; 3. Sealing strip;

[0028] 20. Compressor;

[0029] 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;

[0030] 30. Controller;

[0031] 301. Second housing; 302. Electrical connector. Detailed Implementation

[0032] 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.

[0033] 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.

[0034] 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.

[0035] 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.

[0036] like Figures 1 to 2 As shown, this embodiment provides a heater 10, which includes a first housing 1 and a heating structure 2. The first housing 1 forms a receiving space with a fluid flow channel. The first housing 1 has an opening, an outlet 11, and an inlet 12. The receiving space is connected to the inlet 12 and the outlet 11. The heating structure 2 is disposed at the opening and the heating structure 2 blocks the opening. The heating structure 2 includes a heat-conducting plate 21 and two or more ceramic heating plates 22. The ceramic heating plates 22 are arranged at intervals on the side of the heat-conducting plate 21 away from the opening. The ceramic heating plates 22 are connected to the heat-conducting plate 21 by a nickel-plated solder layer.

[0037] The ceramic heating plate 22 is mounted on the heat-conducting plate 21 via nickel plating and reflow soldering. Heat is transferred to the housing space of the heater 10 through the heat-conducting plate 21, thus preventing the ceramic heating plate 22 from directly contacting the fluid and causing boiling, which would reduce heat exchange efficiency. The nickel-plated bottom soldering method ensures a tighter bond between the ceramic heating plate 22 and the heat-conducting plate 21, with minimal heat loss during heat conduction, thus not affecting heat exchange efficiency.

[0038] Meanwhile, the number of ceramic heating plates 22 is more than two. Thus, compared with a large complete ceramic heating plate 22, the ceramic heating plate 22 provided in this embodiment is smaller in size. The smaller ceramic heating plate 22 requires a lower cost than a large complete ceramic heating plate 22. Moreover, due to its high power density, it can output sufficient heating power by being evenly arranged on the heat-conducting plate 21, and the fluid is heated more evenly through the heat-conducting plate 21.

[0039] In some embodiments, the heat-conducting plate 21 is provided with a support boss 23 protruding from the ceramic heating plate 22. The number of support bosses 23 is the same as the number of ceramic heating plates 22, and each support boss 23 is provided with a ceramic heating plate 22.

[0040] The support boss 23 facilitates the positioning of the ceramic heating plate 22 and the welding of the ceramic heating plate 22, thereby improving the welding processability of the heat-conducting plate 21 and the ceramic heating plate 22. The support boss 23 and the ceramic heating plate 22 are welded by reflow soldering or other methods. The processing accuracy of the contact position between the support boss 23 and the ceramic heating plate 22 can be improved. Compared with the overall processing of the heat-conducting plate 21, the processing cost is reduced and the accuracy is significantly improved. The support boss 23 and the reflow soldering connection method can ensure that the contact between the ceramic heating plate 22 and the support boss 23 is uniform, without affecting the thermal conductivity of the heat-conducting plate 21, and the heat loss is small.

[0041] In some embodiments, along the direction perpendicular to the thickness of the heat-conducting plate 21, the projection of the ceramic heating plate 22 onto the heat-conducting plate 21 is located within the area enclosed by the projection of the supporting boss 23 onto the heat-conducting plate 21.

[0042] It is understandable that the contact area between the ceramic heating plate 22 and the bearing boss 23 is less than or equal to the contact area between the bearing boss 23 and the ceramic heating plate 22, thereby ensuring that the ceramic heating plate 22 can be completely fitted with the bearing boss 23, avoiding the ceramic heating plate 22 from partially protruding from the bearing boss 23, which would result in severe heat loss during the heat transfer process, and ensuring that the heat of the ceramic heating plate 22 is transferred to the heat conducting plate 21.

[0043] In some embodiments, a sealing strip 3 is provided between the first housing 1 and the heat-conducting plate 21.

[0044] Specifically, the first housing 1 is provided with a sealing groove 13 for accommodating the sealing strip 3. The depth of the sealing groove 13 is less than the height of the sealing strip 3, so that the sealing strip 3 can protrude from the sealing groove 13. The part of the sealing strip 3 that protrudes from the sealing groove 13 is in contact with the heat-conducting plate 21. The heat-conducting plate 21 can squeeze the sealing strip 3, so that the sealing strip 3 seals the heat-conducting plate 21 and the first housing 1, preventing the fluid in the first housing 1 from leaking out between the first housing 1 and the heat-conducting plate 21.

[0045] For example, the first housing 1 and the heat-conducting plate 21 are connected by fasteners, specifically bolts and / or rivets. That is, the first housing 1 and the heat-conducting plate 21 are connected by bolts, or the first housing 1 and the heat-conducting plate 21 are connected by rivets, or the first housing 1 and the heat-conducting plate 21 are connected by both bolts and rivets, thereby achieving the purpose of fixing the first housing 1 and the heat-conducting plate 21 together and preventing the heat-conducting plate 21 from separating from the first housing 1 during operation.

[0046] In some other embodiments, the first housing 1 and the heat-conducting plate 21 are connected by welding, thereby achieving the purpose of fixing the first housing 1 and the heat-conducting plate 21 together and preventing the heat-conducting plate 21 from separating from the first housing 1 during operation.

[0047] The first housing 1 has a heat exchange cavity, and a water channel is located within it, exchanging heat with the heat-conducting plate 21. Fluid flows into the first housing 1 through the inlet 12, exchanges heat in the water channel, and then flows out through the outlet 11. A seal 8 is positioned between the first housing 1 and the heat-conducting plate 21 to seal the water channel and prevent fluid leakage. The heat-conducting plate 21 is placed on top of the first housing 1, serving as a sealing cover and heat transfer medium. The heat-conducting plate 21 and the first housing 1 can be connected by bolts or rivets.

[0048] like Figure 3 As shown, in some embodiments, the ceramic heating plate 22 includes a ceramic outer shell layer 222 and a heating resistance layer 223. There are two ceramic outer shell layers 222, and the heating resistance layer 223 is located between the two ceramic outer shell layers 222.

[0049] Connection point 221 is connected to heating resistor layer 223, which then generates heat under the action of current. For example, ceramic heating plate 22 is composed of an alumina ceramic substrate, heating elements such as nickel wire or tungsten wire, and insulating materials such as Teflon tubing or high-temperature resistant adhesive tape. This structure gives it the characteristics of good insulation, rapid heating (reaching operating temperature within 30 seconds), and resistance to acid and alkali corrosion.

[0050] The ceramic heating plate 22 consists of a ceramic outer shell layer 222 and a heating resistor layer 223. The ceramic outer shell layer 222 can be made of aluminum nitride, aluminum oxide, etc. A heating resistor layer 223 is sintered in the middle of the ceramic plate; this layer can be a tungsten wire resistor layer or a copper wire resistor layer, etc. Compared to traditional thick-film heating methods, the ceramic outer shell of this heating plate 22 has high hardness, high thermal conductivity, and good insulation properties, resulting in a higher safety factor. However, since ceramic itself does not have weldability, a nickel plating is applied to the ceramic heating plate 22 to increase its weldability. Simultaneously, support bosses 23 are provided to improve the welding process. The ceramic heating plate 22 is welded to the support bosses 23 using methods such as reflow soldering. Through this welding method, the contact between the ceramic heating plate 22 and the support bosses 23 on the heat-conducting plate 21 is uniform, without affecting the thermal conductivity, resulting in minimal heat loss.

[0051] In some embodiments, each ceramic heating plate 22 has a wiring point 221, which serves as an electrical connection interface for electrical connection with the drive component.

[0052] In some embodiments, the ceramic heating plate 22 is arranged in multiple rows along the length direction of the heat-conducting plate 21, and the number of ceramic heating plates 22 in each row is multiple and the number of ceramic heating plates 22 in each row is the same.

[0053] That is, the ceramic heating plates 22 are arranged in an array along the length of the heat-conducting plate 21. This increases the number of ceramic heating plates 22, allows for a reasonable arrangement of their positions, reduces the manufacturing cost of the ceramic heating plates 22, and ensures that all parts of the heat-conducting plate 21 can be heated by the ceramic heating plates 22 and transfer heat to the fluid.

[0054] It is understandable that two or more supporting bosses 23 and ceramic heating plates 22 are provided on the heat-conducting plate 21 and arranged in a uniform array. Compared with a single large ceramic heating plate 22, using several smaller ceramic heating plates 22 results in a smaller total area and lower production cost. Simultaneously, due to the high power density of the ceramic heating plates 22, the heating power of several small-area ceramic heating plates 22 evenly arranged on the heat-conducting plate 21 is sufficient to meet the heat exchange requirements of the water channel. Furthermore, heat transfer through the larger heat-conducting plate 21 ensures more uniform heating of the water channel. This also avoids direct contact between the ceramic heating plates 22 and the water channel, preventing boiling and bubble formation that could reduce heat exchange performance. Different types of water channel structures can be arranged in the flow channel and abut against the heat-conducting plate 21 to increase the heat exchange area and improve heat exchange efficiency; these will not be listed individually in this embodiment.

[0055] like Figure 4 and Figure 5As 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, wherein a first housing 1 is fixedly connected to the compressor 20.

[0056] Since the first housing 1 is fixedly connected to the compressor 20, compared with the related technology in which the first housing 1 and the compressor 20 are set separately, the fixed connection can reduce the space occupied by the two, and the connection between the first housing 1 and the compressor 20 can reduce the total weight.

[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 a 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 wiring point 221 of the motor stator 2051 and the ceramic heating plate 22.

[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 in that, include: A first housing (1) forms a receiving space, the receiving space having a fluid flow channel, the first housing (1) having an opening, an outlet (11) and an inlet (12), the receiving space being connected to the inlet (12) and the outlet (11); Heating structure (2), the heating structure (2) is disposed at the opening, the heating structure (2) seals the opening, the heating structure (2) includes a heat-conducting plate (21) and a ceramic heating plate (22), the ceramic heating plates (22) are arranged at intervals on the side of the heat-conducting plate (21) away from the opening, the ceramic heating plates (22) and the heat-conducting plate (21) are connected by a nickel-plated solder layer.

2. The heater according to claim 1, characterized in that, The heat-conducting plate (21) is provided with a support boss (23) protruding from the ceramic heating plate (22). The number of support bosses (23) is the same as the number of ceramic heating plates (22), and each support boss (23) is provided with a ceramic heating plate (22).

3. The heater according to claim 2, characterized in that, Along the direction perpendicular to the thickness of the heat-conducting plate (21), the projection of the ceramic heating plate (22) onto the heat-conducting plate (21) is located within the area enclosed by the projection of the bearing boss (23) onto the heat-conducting plate (21).

4. The heater according to any one of claims 1-3, characterized in that, A sealing strip (3) is provided between the first housing (1) and the heat-conducting plate (21).

5. The heater according to any one of claims 1-3, characterized in that, The ceramic heating plate (22) includes a ceramic outer shell layer (222) and a heating resistance layer (223). There are two ceramic outer shell layers (222), and the heating resistance layer (223) is located between the two ceramic outer shell layers (222).

6. The heater according to any one of claims 1-3, characterized in that, Each of the ceramic heating plates (22) has a connection point (221).

7. The heater according to any one of claims 1-3, characterized in that, The ceramic heating plate (22) is arranged in multiple rows along the length direction of the heat-conducting plate (21), and the number of ceramic heating plates (22) in each row is multiple, and the number of ceramic heating plates (22) in each row is the same.

8. A compressor assembly, characterized in that, Includes a compressor (20) and a heater as described in any one of claims 1-7, wherein the first housing (1) is fixedly connected to the compressor (20).

9. The compressor assembly according to claim 8, characterized in that, The compressor assembly also 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. The controller (30) is communicatively connected to the heater (10) and the compressor (20) respectively.

10. The compressor assembly according to claim 8 or 9, characterized in that, 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 provided between the third housing (201) and the stationary plate (203). The moving plate (202) is connected to the main shaft (206) that passes through the third housing (201). The stationary plate (203) is provided with an exhaust hole (2031). The end cover (204) is fixedly connected to the stationary plate (203). The end cover (204) has an exhaust chamber that communicates with the exhaust hole (2031).

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