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 can relatively improve sealing reliability.

[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 first end and the second end are respectively provided with a first groove and a second groove. The exhaust valve also includes two separately disposed sealing bodies. The two sealing bodies can be connected to the first groove and the second groove respectively by deformation. 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.

[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 and the sealing bodies at both ends forming an assembly in the structure shown; Figure 5 for Figure 2 A schematic diagram of the core iron structure shown; Figure 6 for Figure 2 A schematic diagram of the sealing body in the structure 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 Third groove; 241 Annular peripheral wall; 242 Groove bottom wall; 25 First stepped surface; 3 Core iron; 31 First groove; 31A Large diameter section; 31B Small diameter section; 311 Limiting step surface; 312 Groove bottom surface; 32 First suction surface; 34 Second step surface; 35 Annular protrusion; 36 Second groove portion; 4 Vulcanized seal; 41 Middle part; 42 First sealing end; 43 Second sealing end; 5 Sleeve; 6 Spring; 7 Sealing body; 71 First sealing body; 711 First shaft segment; 7111 First end face; 7112 Second end face; 712 Second shaft segment; 713 Third shaft segment; 7131 Step surface; 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 below in conjunction with the accompanying drawings and specific examples.

[0012] Please refer to Figure 2 This application provides an exhaust valve, which can be used as a compressor exhaust valve, but can also be applied to other fields. The exhaust valve in this application 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, but the connection methods of the cap 2 and the sleeve 5, and the valve seat 1 and the sleeve 5, are not limited to the connection methods 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 for external connection and a second interface P2 for communicating with the valve cavity. The first interface P1 communicates with the first valve port 11 through a channel on the valve seat 1, which can be funnel-shaped. There is a gap between the core iron 3 and the peripheral wall surrounding the valve cavity. 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. That is, the base wall 13 has a second interface P2 located between the protrusion 14 and the peripheral wall 12. There can be two second interfaces P2, arranged circumferentially around the first interface P1. In one example, the peripheral wall 12 is connected to the side of the base wall 13 facing the core iron 3, and the sleeve 5 is fixedly connected to the peripheral wall 12. A protrusion 14 is located in the middle of the base wall 13, and a first valve port 11A is located on the protrusion 14. At least one second interface P2 is located on the base wall 13 between the protrusion 14 and the peripheral wall 12.

[0014] In this embodiment, the valve seat 1, end cap 2, and sleeve 5 form a valve cavity. The core iron 3 and spring 6 are located 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, i.e., 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 through mechanical components or it 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 6 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, each end of the core iron 3 is provided with a sealing body 7. The two sealing bodies 7 are relatively independent individuals. This allows the axial dimension of the sealing body 7 to be relatively small, reducing the possibility of deformation. This improves the valve opening sealing performance at low temperatures, reduces valve 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.

[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 6 In this embodiment, the first end of the core iron 3 is provided with a first groove 31 closed at one end, with the opening of the first groove 31 facing the valve seat 1. The second end of the core iron 3 is provided with a second groove 36, with the opening of the second groove 36 facing the end cap 2. The first sealing body 71 is connected to the first groove 31 by deformation limiting, and the second sealing body 72 is connected to the second groove 36 by deformation limiting. In one example, the sealing body (first sealing body 71) at the first end is partially located inside the first groove 31, and the sealing body (second sealing body 72) at the second end is partially located inside the second groove 36. In this way, the sealing body located outside the groove is not squeezed by the groove and is basically undeformed. The sealing surface on the sealing body that mates with the valve port is basically undeformed, which is beneficial to improving the sealing reliability.

[0021] When the first sealing body 71 and the second sealing body 72 have the same structure, the first groove portion 31 and the second groove portion 36 can also have the same structure. Of course, the first sealing body 71 and the second sealing body 72 can also have different structures, and correspondingly, the first groove portion 31 and the second groove portion 36 will also have structural differences. This article takes the example of the first groove portion 31 and the second groove portion 36 having the same structure to continue to introduce the technical solution and technical effect.

[0022] In one example, both the first groove portion 31 and the second groove portion 36 are stepped holes, each including a large-diameter hole portion 31A and a small-diameter hole portion 31B. A limiting stepped surface 311 facing the bottom 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 includes a first shaft segment 711, a second shaft segment 712, and a third shaft segment 713 connected along the axial direction. The radial dimension of the second shaft segment 712 is smaller than the radial dimension of the first shaft segment 711 and also smaller than the radial dimension of the third shaft segment 713. That is, the sealing body 7 is approximately an I-shaped structure that is thicker at both ends and thinner in the middle. The radial dimensions of the first shaft segment 711 and the third shaft segment 713 can be the same or different. The first shaft segment 711 is engaged between the limiting step surface 311 and the bottom surface 312 of the first groove portion 31. The second shaft segment 712 penetrates the small-diameter hole portion 31B. The third shaft segment 713 is located outside the first groove portion 31. The end of the third shaft segment 713 facing away from the second shaft segment 712 abuts against the first valve port portion 11A or the second valve port portion 21A. That is, the third shaft segment 713 of the first sealing body 71 abuts against the first valve port portion 11A to close the first valve port 11; the third shaft segment 713 of the second sealing body 72 abuts against the second valve port portion 21A to close the second valve port 21. In this embodiment, the limiting step surface 311 and the first shaft segment 711 are engaged to prevent the sealing body 7 from coming out of the interior of the large-diameter hole portion 31A. During installation, the sealing body 7 is compressed so that the first shaft section 711 of the sealing body 7 is pressed into the interior of the large diameter hole 31A from one end of the small diameter hole 31B, and the first shaft section 711 is limited to the interior of the large diameter hole 31A by the limiting step surface 311.

[0023] 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.

[0024] 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.

[0025] In one embodiment, the outer periphery of the end of the first shaft segment 711 away from the second shaft segment 712 of the sealing body 7 may be provided with a chamfer structure. When the sealing body 7 is press-fitted into the large diameter hole 31A, the chamfer structure can guide the sealing body 7.

[0026] Furthermore, the diameters of the first shaft segment 711 and the third shaft segment 713 can be the same, and the outer periphery of the end of the third shaft segment 713 away from the second shaft segment 712 can also be provided with a chamfer structure. In this way, both the first shaft segment 711 and the third shaft segment 713 of the sealing body 7 can be installed in conjunction with the large-diameter hole portion 31A, thereby improving the ease of installation.

[0027] In one example, the first shaft segment 711 includes a first end face 7111 and a second end face 7112. The first end face 7111 is located on the side of the first shaft segment 711 away from the second shaft segment 712. The second end face 7112 is connected to the second shaft segment 712. The first end face 7111 abuts against the bottom surface 312 of the groove portion 31 of the first groove portion 31. The second end face 7112 abuts against the limiting step surface 311. That is, the two end faces of the first shaft segment 711 abut against the two end walls of the large-diameter hole portion respectively. In this way, the large-diameter portion 31A completely limits the axial movement of the sealing body 7, improving the installation reliability of the sealing body 7.

[0028] In another embodiment of this application, the radial dimension of the third shaft segment 713 is larger than the slot size of the first groove portion 31, and the stepped surface 7131 of the third shaft segment 713 facing the second shaft segment 712 abuts against the core iron 3 or has a gap. When the stepped surface 7131 abuts against the core iron 3, the core iron 3 can further support the third shaft segment 713. When there is a gap between the stepped surface 7131 and the core iron 3, the core iron 3 exerts basically no force on the third shaft segment 713, and the third shaft segment 713 has basically no deformation. In this way, the limiting of the sealing body 7 and the first groove portion 31 will not affect the deformation of the sealing surface on the third shaft segment 713, which is beneficial to improving the sealing performance of the sealing body for the valve port.

[0029] In one embodiment, the core iron 3 has a first engaging surface 32 facing the end cap 2, and the core iron 3 also includes an annular protrusion 35 protruding from the first engaging surface 32. The third shaft segment 713 is at least partially located in the inner hole enclosed by the annular protrusion 35. The third shaft segment 713 may be higher than the annular protrusion 35, that is, the third shaft segment 713 may be partially exposed outside the space enclosed by the annular protrusion 35. Of course, the third shaft segment 713 may also be completely located inside the space enclosed by the annular protrusion 35.

[0030] In this embodiment, the end cap 2 also has a third groove 24 opposite to the annular protrusion 35. The second valve port 21A is disposed on the bottom wall of the groove of the third groove 24. When the valve is closed, the end of the annular protrusion 35 away from the first suction surface 32 is flush with the end face of the groove of the third groove 24, or the annular protrusion 35 is partially located inside the third groove 24.

[0031] 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 annular protrusion 35 and the third groove 24, thus not affecting the initial operating current. After the core 3 and end cap 2 are attracted, the radially overlapping area of ​​the annular protrusion 35 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.

[0032] The inner peripheral wall of the annular protrusion 35 is axially clearance-fitted with the third shaft section 713. In this way, the setting of the annular protrusion 35 will not affect the deformation of the sealing surface on the third shaft section 713 that mates with the valve port, which is beneficial to improving the sealing performance of the sealing body 7 to the valve port.

[0033] In this embodiment, the third groove portion 24 includes an annular peripheral wall 241, and the end face of the annular peripheral wall 241 facing the core iron 3 is the second suction surface 22. 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 towards the end cap 2, avoiding excessive compression of the sealing body, and also avoiding excessive compression of the spring, thus protecting the sealing body 7 and the spring 6.

[0034] Both the first suction surface 32 and the second suction surface 22 can be planes, or they can be conical or inclined surfaces, etc.

[0035] 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 5 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.

[0036] When the coil is de-energized, the core iron 3 quickly closes the first valve port 11 under the action of the spring 6.

[0037] In this embodiment, the outer periphery of the sealing body 7 also has at least one notch (not shown in the figures), which extends axially and penetrates both end faces of the sealing body 7. The notches can be evenly arranged circumferentially, and can be arc-shaped notches, extending axially and penetrating both end faces of the sealing body. This effectively prevents the formation of a sealing cavity between the sealing body 7 and the core iron 3, thus preventing the sealing body 7 from detaching from the core iron 3 under the high pressure of the sealing cavity.

[0038] 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.

[0039] 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.

[0040] The above are merely 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 protection scope of this utility model.

Claims

1. An exhaust valve, characterized in that, The device 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 first end and the second end are respectively provided with a first groove and a second groove. The exhaust valve also includes two separately disposed sealing bodies. The two sealing bodies can be connected to the first groove and the second groove respectively by deformation. 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. The sealing body at the first end is partially located in the first groove, and the sealing body at the second end is partially located in the second groove.

2. The exhaust valve according to claim 1, characterized in that, Both sealing bodies are I-shaped and include a first shaft segment, a second shaft segment, and a third shaft segment connected along the axial direction. The radial dimension of the second shaft segment is smaller than that of the first shaft segment and also smaller than that of the third shaft segment. The first groove and the second groove have the same structure, both including a large-diameter hole and a small-diameter hole. The inner wall of the large-diameter hole and the inner wall of the small-diameter hole are connected by a limiting step surface. The limiting step surface faces the bottom surface of the first groove. The first shaft segment is engaged between the limiting step surface and the bottom surface of the first groove. The second shaft segment passes through the small-diameter hole. The third shaft segment is located outside the first groove. The end of the third shaft segment facing away from the second shaft segment abuts against the first valve port or the second valve port.

3. The exhaust valve according to claim 2, characterized in that, The first shaft segment includes a first end face and a second end face. The first end face is located on the side of the first shaft segment away from the second shaft segment. The second end face is connected to the second shaft segment. The first end face abuts against the bottom surface of the first groove portion. The second end face abuts against the limiting step surface.

4. The exhaust valve according to claim 2, characterized in that, The radial dimension of the third shaft segment is larger than the slot size of the first groove portion, and the stepped surface of the third shaft segment facing the second shaft segment abuts against the core iron or has a gap.

5. The exhaust valve according to any one of claims 2 to 4, characterized in that, The core has a first contact surface facing the end cap, and the core further includes an annular protrusion protruding from the first contact surface, and the third shaft segment is at least partially located in the inner hole enclosed by the annular protrusion; The end cap also has a third groove portion opposite to the annular protrusion. The second valve port portion is disposed on the bottom wall of the third groove portion. When the valve is closed, the end of the annular protrusion away from the first suction surface is flush with the end face of the groove opening of the third groove portion, or the annular protrusion portion is located inside the third groove portion.

6. The exhaust valve according to claim 5, characterized in that, The inner peripheral wall of the annular protrusion is in circumferential clearance fit with the third shaft segment.

7. The exhaust valve according to claim 5, characterized in that, The third groove includes an annular peripheral wall, and the end face of the annular peripheral wall facing the core iron is the second suction surface. When the valve is fully opened, the first suction surface and the second suction surface abut against each other.

8. The exhaust valve according to any one of claims 1 to 4, characterized in that, 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.

9. The exhaust valve according to claim 8, characterized in that, The valve seat includes a bottom wall and a peripheral wall connected together. The peripheral wall is connected to the side of the bottom wall facing the core iron. The sleeve is fixedly connected to the peripheral wall. A protrusion is provided in the middle of the bottom wall. The first valve port is provided in the protrusion. At least one second interface is provided on the bottom wall, located between the protrusion and the peripheral wall.

10. The exhaust valve according to any one of claims 1 to 4, characterized in that, The outer periphery of the sealing body also has at least one notch that extends axially and penetrates both ends of the sealing body.

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