An exhaust valve

Abstract

The utility model discloses an exhaust valve, including valve seat, core iron and end, the utility model discloses core iron both ends end portion separately sets up sealing body, and two sealing bodies are relatively independent individual, and the axial dimension of sealing block can be smaller like this, and the possibility of deformation amount is smaller, improves the sealing performance of low temperature opening valve, reduced the valve leakage and action noise phenomenon, can also guarantee high temperature opening valve flow simultaneously, makes the exhaust valve normal action, and further improved the working performance of exhaust valve. In addition, the sealing body is relatively independent individual, and single forming, and the processing difficulty is small, and the cost is low.

Description

Technical Field

[0001] This utility model relates to the field of automotive technology, specifically to an exhaust valve. Background Technology

[0002] Currently, the compressor exhaust valve is a common component in unsprung vehicles. Its main structure includes a core iron 3, a vulcanized seal 4, a valve seat 1, and a head 2. The core iron 3 has a central through hole. The middle part 41 of the vulcanized seal 4 is located in the central through hole of the core iron 3, and the two ends are located outside the two end faces of the core iron 3, forming a first sealing end 42 and a second sealing end 43, respectively. When the valve is closed, the first sealing end 42 forms a seal with the first valve port 11 on the valve seat 1. When the valve is opened, the second sealing end 43 forms a seal with the second valve port 21.

[0003] The vulcanized seal 4 is fixedly connected to the core iron 3 through vulcanization. The first sealing end 42 of the vulcanized seal 4 extends axially along the core iron 3 to the second sealing end 43. After vulcanization, the centers of the first sealing end 42 and the second sealing end 43 are usually concave inward, forming a funnel shape, which leads to poor sealing effect of the valve port. Furthermore, the total length of the vulcanized seal 4 is relatively long, and the deformation at different temperatures is also relatively large. For example, when the exhaust valve is at a low temperature (approximately -40℃), the vulcanized seal 4 shrinks, causing the opening of the second valve port 21 to increase. Thus, when the coil is energized, the second valve port 21 is not yet sealed when the end cap 2 and the core iron 3 contact each other, resulting in internal leakage and increased operating noise. At high temperatures, the vulcanized seal 4 expands, causing the opening of the second valve port 21 to decrease, or even directly blocking the second valve port 21, resulting in a small valve opening flow or even the valve failing to operate.

[0004] Overcoming the aforementioned deficiencies of the existing technology is a technical problem that those skilled in the art need to solve. Utility Model Content

[0005] The purpose of this application is to provide an exhaust valve that improves the reliability of the seal.

[0006] This application provides an exhaust valve, including a valve seat, a core iron, and a head. The core iron is reciprocating between the valve seat and the head. The valve seat has a first valve port, which includes a first valve opening. The head has a second valve port, which includes a second valve opening. The core iron includes a first end and a second end arranged axially. The exhaust valve also includes two separately disposed sealing bodies. The two sealing bodies can be deformed and positioned at the first end and the second end. The sealing body at the first end can open or close the first valve port, and the sealing body at the second end can open or close the second valve port. Both the first end and the second end of the core iron are provided with a first groove, and the sealing body is entirely located inside the first groove.

[0007] In this application, sealing bodies are separately provided at both ends of the core iron. The two sealing bodies are relatively independent individuals. This allows the axial dimension of the sealing block to be relatively small, reducing the possibility of deformation. This improves the valve opening sealing performance at low temperatures, reduces internal leakage and operating noise, and also ensures the valve opening flow at high temperatures, enabling the exhaust valve to operate normally and thus improving the working performance of the exhaust valve.

[0008] In addition, the sealing body is a relatively independent unit, molded individually, which makes it easy to process and has low cost. Attached Figure Description

[0009] Figure 1 This is a partial schematic diagram of an exhaust valve in the current technology; Figure 2 This is a partial structural schematic diagram of the exhaust valve in one embodiment of this application; Figure 3 for Figure 2 Enlarged view of point B in the middle; Figure 4 for Figure 2 A schematic diagram of the core iron in the structure shown; Figure 5 for Figure 4 An enlarged schematic diagram of B1 in the structure shown; Figure 6 for Figure 2 A schematic diagram of the sealing body in the structure shown; Figure 7 for Figure 6 The front view of the seal shown; Figure 8 This is a partial structural diagram of the exhaust valve in another embodiment of this application; Figure 9 for Figure 8 Enlarged schematic diagram of point C in the structure shown; Figure 10 for Figure 8A schematic diagram of the core iron structure shown; Figure 11 for Figure 10 A magnified schematic diagram of C1 in the structure shown; Figure 12 for Figure 8 A schematic diagram of the sealing body in the structure shown; Figure 13 for Figure 12 The front view of the seal shown.

[0010] The annotations in the attached figures are explained as follows: 1 Valve seat; 11A First valve port; 11 First valve port; 12 Seat peripheral wall; 13 Seat bottom wall; 14 Protrusion; 2 End cap; 21A Second valve port; 21 Second valve port; 22 Second suction surface; 23 Protrusion; 24 Second groove; 241 Outer peripheral wall; 242 Groove bottom wall; 25 First step surface; 3 Core iron; 31 First groove; 31A Large diameter section; 31B Small diameter section; 31C Groove; 311 Limiting step surface; 312 Groove bottom surface; 32 First suction surface; 33 First column section; 34 Second step surface; 4 Vulcanized seal; 41 Middle section; 42 First sealing end; 43 Second sealing end; 5 Sleeve; 6 Spring; 7 Sealing body; 71 First sealing body; 711 First shaft section; 712 Second shaft section; 713 Transition section; 714 Limiting part; 715 Notch; 716 Third shaft section; 72 Second sealing body; Detailed Implementation

[0011] To enable those skilled in the art to better understand the technical solutions of this application, the embodiments of this application will be further described in detail below with reference to the accompanying drawings and specific examples.

[0012] Please refer to Figure 2 and Figure 8 This application provides an exhaust valve. The exhaust valve in this embodiment can be a compressor exhaust valve, but it can also be applied to other fields. The exhaust valve in this embodiment includes a valve seat 1, a core iron 3, a spring 6, a cap 2, and a sleeve 5. The sleeve 5 is a tube open at both ends. The valve seat 1 and the cap 2 are respectively installed at the two opening positions of the sleeve 5. The valve seat 1 and the sleeve 5 are fixedly connected, and the two can be fixedly connected by riveting, welding, etc. In one specific example, the lower end of the sleeve 5 has a flared structure, which is riveted and fixedly connected to the valve seat 1. The cap 2 is fixedly connected to the other end of the sleeve 5. The cap 2 and the sleeve 5 are usually fixedly connected by welding. Of course, the connection method of the cap 2 and the sleeve 5, and the valve seat 1 and the sleeve 5, is not limited to the connection method described in this application.

[0013] In this embodiment, both the valve seat 1 and the end cap 2 are provided with valve ports. The valve port on the valve seat 1 is defined as the first valve port 11A, and the valve port on the end cap 2 is defined as the second valve port 21A. The first valve port 11A includes a first valve port 11, and the second valve port 21A includes a second valve port 21. The valve seat 1 also has a first interface P1 and a second interface P2 for external connection. The first interface P1 communicates with the first valve port 11 through a channel on the valve seat 1, which can be funnel-shaped. In one example, the valve seat 1 includes a peripheral wall 12 and a bottom wall 13, which together form part of the valve cavity of the exhaust valve. A protrusion 14 is provided on the bottom wall 13, and the first valve port 11A is disposed on the protrusion 14. The first interface P1 is located in the middle of the base wall 13, and the second interface P2 is also located on the base wall 13, between the protrusion 14 and the peripheral wall 12. There can be two second interfaces P2, which are arranged circumferentially around the first interface P1.

[0014] In this embodiment, the valve seat 1, end cap 2, and sleeve 5 form a valve cavity. The core iron 3 and spring are disposed inside the valve cavity, and the core iron 3 is capable of axial reciprocating motion. The core iron 3 includes a first end and a second end arranged axially. The exhaust valve also includes two separately disposed sealing bodies 7, that is, the two sealing bodies 7 are two independent components that are not connected to each other. For the sake of brevity and clarity in describing the technical solution, this application defines the two sealing bodies 7 as a first sealing body 71 and a second sealing body 72, respectively. The first sealing body 71 is connected to the first end of the core iron 3 by deformation limiting, and the second sealing body 72 is connected to the second end of the core iron 3 by deformation limiting. The limiting connection described herein can be achieved by mechanical parts, or by means of vulcanization, etc. The limiting connection can be a fixed connection.

[0015] In this embodiment, the first sealing body 71 and the second sealing body 72 can be made of materials with good elastic deformation, such as rubber or silicone. In this embodiment, the main function of the spring is to provide the core iron 3 with a force to return to its initial state. The spring can be a cylindrical helical spring.

[0016] Typically, the reciprocating motion of the core iron 3 is powered by a drive coil (not shown in the figure). By controlling the energization or de-energization of the drive coil, the core iron 3 can be positioned at different axial positions of the exhaust valve. For example, when the drive coil is energized (opens the valve), the core iron 3 moves towards the end cap 2 under the action of the electromagnetic field generated by the drive coil, while simultaneously compressing the spring until the first contact surface 32 on the core iron 3 abuts against the second contact surface 22 on the end cap 2. The second sealing body 72 abuts against the second valve port 21A to close the second valve port 21. In this state, the first sealing body 71 separates from the first valve port 11A, the first valve port 11 is opened, and the medium in the system enters from the first interface P1, passes through the first valve port 11, and enters the second valve port 21 until the pressure of the second valve port 21 matches the system pressure. When the drive coil is de-energized (valve closed), the electromagnetic force disappears, and the core iron 3, under the elastic restoring force of the spring, moves away from the end cap 2 towards the valve seat 1, so that the first sealing body 71 on the core iron 3 abuts against the first valve port 11A, the first valve port 11 is closed, and the second valve port 21 is opened. The medium in the second interface P2 can flow through the gap between the core iron 3 and the sleeve 5 to the position of the second valve port 21, and then be discharged through the third interface P3 on the end cap 2.

[0017] In other words, the core iron 3 in the exhaust valve can reciprocate along the axial direction to the open valve position and the closed valve position. When the core iron 3 is in the closed valve position, the first sealing body 71 abuts against the first valve port 11A to close the first valve port, and the second sealing body 72 separates from the second valve port 21A to make the second valve port 21 open. When the core iron 3 is in the open valve position, the second sealing body 72 abuts against the second valve port 21A to close the second valve port 21, and the first sealing body 71 separates from the first valve port 11A to open the first valve port 11.

[0018] In this embodiment, sealing bodies 7 are separately provided at both ends of the core iron 3. The two sealing bodies 7 are relatively independent individuals. In this way, the axial dimension of the sealing body 7 can be relatively small, the possibility of deformation is relatively small, the valve opening sealing performance is improved at low temperature, the leakage inside the valve and the noise of operation are reduced, and at the same time, the valve opening flow at high temperature can be guaranteed, so that the exhaust valve can operate normally, thereby improving the working performance of the exhaust valve.

[0019] In addition, the sealing body 7 is a relatively independent unit, molded individually, which makes it easy to process and has low cost.

[0020] Please combine Figures 2 to 5 , Figures 8 to 12In this embodiment, the first and second ends of the core iron 3 are each provided with a first groove 31, and the two sealing bodies 7 are respectively located entirely inside the first groove 31 at the first end and the first groove 31 at the second end. That is, both sealing bodies 7 are entirely located inside the first groove 31. The first groove 31 forms a slot 31C on the corresponding end face of the core iron 3, and the sealing body 7 is connected to the first groove 31 by means of snap-fit ​​or adhesive bonding.

[0021] In this embodiment, the core iron 3 is specially provided with a first groove 31 of a predetermined depth, and the sealing body 7 is located inside the first groove 31, which is conducive to achieving the installation stability of the sealing body 7 and the two are reliably connected.

[0022] The following text provides a specific limiting method for the sealing body 7 and the first groove portion 31.

[0023] Please refer to Figures 3 to 5 , Figures 9 to 11 In this embodiment, the first groove portion 31 is a stepped hole, including a large-diameter hole portion 31A and a small-diameter hole portion 31B. A limiting stepped surface 311 facing the bottom surface 312 of the groove is connected between the inner wall of the large-diameter hole portion 31A and the inner wall of the small-diameter hole portion 31B. The sealing body 7 has a limiting portion 714, which abuts against the limiting stepped surface 311. The bottom surface 312 of the groove and the limiting stepped surface 311 axially limit the sealing body 7. The end of the small-diameter hole portion 31B away from the large-diameter hole portion 31A is a groove opening 31C. The sealing body 7 can be completely located between the limiting stepped surface 311 and the bottom surface 312 of the groove, or it can be partially located between the limiting stepped surface 311 and the bottom surface 312 of the groove. The limiting portion 714 and the limiting stepped surface 311 can prevent the sealing body 7 from coming out of the interior of the large-diameter hole portion 31A. In other words, the diameter C of the small diameter hole 31B is smaller than the diameter A of the limiting part 714 of the sealing body 7. During installation, the sealing body 7 is compressed so that the limiting part 714 of the sealing body is pressed into the interior of the large diameter hole 31A from one end of the small diameter hole 31B. The limiting step surface 311 is used to limit the limiting part 714 to the interior of the large diameter hole 31A.

[0024] In this embodiment, the inner peripheral wall of the small-diameter hole 31B can be an annular wall. Of course, the inner peripheral wall of the small-diameter hole can also be a non-closed arc-shaped wall, for example, two or more arc-shaped walls are arranged at intervals along the circumference.

[0025] In the above embodiments, the first groove portion 31 is in the form of a stepped hole, which has a simple structure and can effectively prevent the sealing body from coming out of the interior of the large-diameter hole portion 31A. That is, the limiting step surface 311 has a high reliability in limiting the sealing body.

[0026] This application uses the example of the first sealing body 71 and the second sealing body 72 having the same structure to introduce the technical solution and technical effect. Of course, the structures of the first sealing body 71 and the second sealing body 72 may not be completely the same.

[0027] Please refer to Figure 5 , Figure 6 and Figure 7 In one embodiment, the sealing body 7 includes a first shaft segment 711 and a second shaft segment 712 connected together. The sealing body 7 may be generally T-shaped. The radial dimension A of the first shaft segment 711 is greater than the radial dimension C of the small-diameter bore, and the radial dimension B of the second shaft segment 712 is less than or equal to the dimension C of the small-diameter bore. That is, the radial dimension of the first shaft segment 711 is greater than the radial dimension of the second shaft segment 712. The sealing body 7 has a stepped shaft structure. The limiting portion 714 is the end face of the first shaft segment 711 away from the second shaft segment 712.

[0028] In this way, when the sealing body is installed into the first groove 31, the second shaft segment 712 is approximately the same size as the groove 31C. The second shaft segment 712 is placed in the groove 31C position, and the first shaft segment 711 is pressed into the large-diameter hole using a tool. In this way, the second shaft segment 712 can serve as a guide for installation. After the sealing body is installed, the limiting part 714 abuts against the limiting step surface 311, and the end face of the second shaft segment 712 away from the first shaft segment 711 abuts against the bottom surface 312 of the groove 31 of the first groove. This is beneficial for the reliable axial positioning of the sealing body 7.

[0029] A transition section 713 can be connected between the first shaft segment 711 and the second shaft segment 712 to facilitate processing.

[0030] Please refer to Figures 11 to 13 In another embodiment of this application, the sealing body 7 further includes a third shaft segment 716, which is connected to the side of the first shaft segment 711 away from the second shaft segment 712. The radial dimension D of the third shaft segment 716 is smaller than the radial dimension A of the first shaft segment 711, and the radial dimension D of the third shaft segment 716 is smaller than the dimension C of the slot 31C (small diameter hole). That is, there is a circumferential gap between the third shaft segment 716 and the small diameter hole 31B. The end of the third shaft segment 716 away from the first shaft segment 711 is sealed and fitted with the first valve port 11A or the second valve port 21A. In this embodiment of the application, the end face of the third shaft segment 716 away from the first shaft segment 711 is sealed and fitted with the first valve port 11A or the second valve port 21A.

[0031] In this embodiment, the sealing surface on the sealing body 7 that seals with the first valve port 11A or the second valve port 21A is located on the third shaft section 716, away from the end face that limits the fit with the limiting step surface 311. In this way, the limiting of the sealing body 7 will not affect the deformation of the sealing surface on the third shaft section 716, which is beneficial to improving the sealing performance of the sealing body for the valve port.

[0032] Please see Figure 2 , Figure 9 As shown, in one embodiment, the limiting portion 714 abuts against the limiting step surface 311, the end of the second shaft segment 712 away from the first shaft segment 711 abuts against the closed end (groove bottom surface 312) of the first groove portion 31, and the axial height of the third shaft segment 716 is less than or equal to the axial height of the small diameter hole portion 31B. The third shaft segment 716 can be completely located inside the small diameter hole portion 31B, so that the axial dimension E of the small diameter hole portion 31B is... Figure 13 The number of teeth can be relatively large, which is beneficial to improving the limiting strength.

[0033] Please see Figure 6 and Figure 12 In the above embodiments, the outer periphery of the sealing body 7 also has at least one notch 715. The notch 715 can be evenly arranged circumferentially, and can be an arc-shaped notch. The notch 715 extends axially and penetrates both end faces of the sealing body. The through-hole of the notch 715 on the end face of the sealing body near the small-diameter hole 31B communicates with the inner hole of the small-diameter hole. This can effectively prevent the formation of a sealing cavity between the sealing body 7 and the core iron 3, which would cause the sealing body 7 to fall off the core iron 3 under the high pressure of the sealing cavity.

[0034] Please see again Figure 3 , Figure 4 , Figure 9 and Figure 10 In this embodiment, the core iron 3 has a first suction surface 32, and the end cap 2 has a second suction surface 22. The first suction surface 32 and the second suction surface 22 are arranged opposite each other along the axial direction. When the valve is fully open, the first suction surface 32 and the second suction surface 22 abut against each other. When the valve is fully closed, the first suction surface 32 and the second suction surface 22 separate. In this embodiment, the first suction surface 32 and the second suction surface 22 can control the stroke of the core iron 3 moving toward the end cap 2, avoiding excessive compression of the sealing body, and also avoiding excessive compression of the spring, thus protecting the sealing body and the spring.

[0035] Both the first suction surface 32 and the second suction surface 22 can be planes, or they can be conical or inclined surfaces, etc.

[0036] Please refer to Figure 4In one embodiment, the core iron further includes a first column segment 33 connected to the first suction surface 32 and protruding toward the end cap 2. The slot 31C of the first groove portion 31 located at the first end penetrates the end face of the first column segment 33 away from the first suction surface 32. The end cap 2 also has a second groove portion 24 opposite to the first column segment 33. A second valve port portion 21A is disposed on the bottom wall 242 of the groove portion 24. The second suction surface 22 is disposed on the outer peripheral wall 241 of the second groove portion 24. In the closed valve state, the end face of the first column segment 33 away from the first suction surface 32 is flush with the end face of the slot 31C of the second groove portion 24, or the first column segment 33 is partially located inside the second groove portion 24.

[0037] Initially, when energized, magnetic lines of force pass perpendicularly through the contact surfaces of the core 3 and the end cap 2. Almost no magnetic lines of force pass through the radially overlapping area of ​​the first column segment 33 and the second groove portion 24, thus not affecting the initial operating current. After the core 3 and the end cap 2 are attracted, the radially overlapping area of ​​the first column segment 33 and the end cap 2 increases, and the number of magnetic lines of force passing perpendicularly through this area increases. This reduces the axial electromagnetic force on the core 3, facilitating rapid separation of the core 3 from the end cap 2 after the coil is de-energized.

[0038] Of course, the structure of end cap 2 and core iron 3 can take many forms; please refer to [the relevant documentation]. Figure 9 and Figure 10 In another specific embodiment, the groove 31C of the first groove portion 31 penetrates the first suction surface 32, and the protrusion 23 is directly provided on the second suction surface 22 of the end cap 2. The second valve port portion 21A is located on the protrusion 23. This structure is simple.

[0039] In this embodiment, one end of the spring 6 abuts against the end cap 2, and the other end abuts against the core iron 3. For details, please refer to... Figure 3 and Figure 9 The outer periphery of the core iron 3 may be provided with a second stepped surface 34, and the end cap 2 is provided with a first stepped surface 25. The two ends of the spring 6 respectively abut against the first stepped surface 25 and the second stepped surface 34. Under the elastic pressure of the spring 6, the sealing body (first sealing body 71) at the first end can abut against the first valve port 11A to close the first valve port 11.

[0040] When the coil is de-energized, the core iron 3 quickly closes the first valve port 11 under the action of the spring 6.

[0041] The terms "first" and "second" used in this article are used only for the convenience of describing two or more structures or components that are identical or similar in structure and / or function, and do not indicate any special limitation on order and / or quantity and / or importance.

[0042] In the description of embodiments of this application, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus.

[0043] The above are merely preferred embodiments of this utility model. It should be noted that, for those skilled in the art, several improvements and modifications can be made without departing from the principle of this utility model, and these improvements and modifications should also be considered within the scope of protection of this utility model.

Claims

1. An exhaust valve, characterized in that, The valve includes a valve seat, a core, and a head. The core can reciprocate between the valve seat and the head. The valve seat has a first valve port, which includes a first valve opening. The head has a second valve port, which includes a second valve opening. The core includes a first end and a second end arranged axially. The exhaust valve also includes two separately disposed sealing bodies. The two sealing bodies can be limited by deformation at the first end and the second end. The sealing body at the first end can open or close the first valve port, and the sealing body at the second end can open or close the second valve port. Both the first end and the second end of the core have a first groove, and the sealing body is entirely located inside the first groove.

2. The exhaust valve according to claim 1, characterized in that, The first groove portion forms a slot on the corresponding end face of the core iron, and the sealing body is limited and connected to the first groove portion.

3. The exhaust valve according to claim 2, characterized in that, The first groove portion includes a large-diameter hole portion and a small-diameter hole portion. The inner walls of the large-diameter hole portion and the inner walls of the small-diameter hole portion are connected by a limiting step surface. The limiting step surface faces the bottom surface of the first groove portion. The sealing body includes a limiting portion. The limiting portion abuts against the limiting step surface. The bottom surface of the groove and the limiting step surface axially limit the sealing body. The groove opening is formed at the end of the small-diameter hole portion away from the large-diameter hole portion.

4. The exhaust valve according to claim 3, characterized in that, The sealing body includes a first shaft segment and a second shaft segment connected together. The radial dimension of the first shaft segment is greater than the dimension of the small-diameter hole, and the radial dimension of the second shaft segment is less than or equal to the dimension of the small-diameter hole. The limiting part is the end face of the first shaft segment away from the second shaft segment.

5. The exhaust valve according to claim 4, characterized in that, The sealing body further includes a third shaft segment, which is connected to the side of the first shaft segment away from the second shaft segment. The radial dimension of the third shaft segment is smaller than the size of the small diameter hole. The end of the third shaft segment away from the first shaft segment is sealed to the first valve port or the second valve port. The limiting part is an end face connected between the first shaft segment and the third shaft segment.

6. The exhaust valve according to claim 5, characterized in that, The axial height of the third shaft segment is less than or equal to the axial height of the small-diameter hole, the limiting part abuts against the limiting step surface, and the end of the second shaft segment away from the first shaft segment abuts against the closed end of the first groove.

7. The exhaust valve according to any one of claims 3 to 6, characterized in that, The outer periphery of the sealing body also has at least one notch, which extends axially and penetrates both end faces of the sealing body, and the notch is a through-hole on the end face of the sealing body near the small-diameter hole, communicating with the inner hole of the small-diameter hole.

8. The exhaust valve according to any one of claims 2 to 6, characterized in that, The core iron has a first suction surface, and the end cap has a second suction surface. The first suction surface and the second suction surface are arranged opposite each other along the axial direction. When the valve is opened, the first suction surface and the second suction surface abut against each other.

9. The exhaust valve according to claim 8, characterized in that, The core iron also includes a first column segment connected to the first suction surface and protruding toward the end cap. A small-diameter hole in the first groove portion at the first end penetrates the end face of the first column segment away from the first suction surface. The end cap also has a second groove portion opposite to the first column segment. The second valve port portion is disposed on the bottom wall of the groove portion of the second groove portion. The second suction surface is disposed on the outer peripheral wall of the second groove portion. When the valve is closed, the end face of the first column segment away from the first suction surface is flush with the end face of the groove opening of the second groove portion, or the first column segment portion is located inside the second groove portion. Alternatively, the groove of the first groove extends through the first suction surface, the second suction surface is provided with a protrusion, and the second valve port is located on the protrusion.

10. The exhaust valve according to any one of claims 2 to 6, characterized in that, It also includes a spring, one end of which abuts against the end cap and the other end against the core iron. Under the elastic pressure of the spring, the sealing body at the first end can abut against the first valve port to close the first valve port. Alternatively / and, it also includes a sleeve with openings at both ends, one end of which is fixedly connected to the valve seat, and the other end of which is fixedly connected to the end cap. The valve seat, the sleeve, and the end cap form a valve cavity. The valve seat is also provided with a first interface communicating with the first valve port and a second interface communicating with the valve cavity. The core iron is located inside the valve cavity, and there is a gap between the core iron and the peripheral wall surrounding the valve cavity.

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