Valve structure

Abstract

The utility model relates to a valve structure which comprises a valve rod and a guide sleeve assembly arranged on the outer side of the valve rod in a sleeving mode, according to the valve structure, a channel for fluid circulation is formed below the guide sleeve assembly, and the guide sleeve assembly comprises a guide sleeve body and a sealing piece assembled on the guide sleeve body. The sealing part is arranged on the guide sleeve body, the filtering part is arranged below the sealing part, the sealing part forms sealing between the valve rod and the guide sleeve body, and the filtering part forms filtering between the sealing part and the channel so as to protect the sealing part. According to the valve structure provided by the invention, the sealing element can be protected, so that the sealing element has good sealing performance and long service life.

Description

Technical Field

[0001] The present application relates to the technical field of gas valves, and particularly to a valve structure. Background Art

[0002] At present, the treatment of nitrogen oxides (NOx) in the exhaust gas of diesel engines mainly adopts SCR technology (Selective Catalytic Reduction). The working principle of SCR technology is that under the action of a catalyst, a reducing agent reduces NOx in the exhaust gas into harmless nitrogen and water. Although SCR technology can reduce the emissions of NOx to a certain extent, with the increasingly strict emission requirements, higher requirements are put forward for post-treatment technologies such as SCR, which increases the post-treatment cost and difficulty. Therefore, relying solely on post-treatment technologies such as SCR is not enough.

[0003] For this reason, the industry is also adopting EGR technology (Exhaust Gas Recirculation). EGR technology reduces the temperature and oxygen concentration in the combustion chamber by reintroducing a part of the exhaust gas into the combustion chamber and mixing it with fresh gas before combustion, effectively reducing the generation of NOx. At the same time, in gasoline engines, the application of EGR technology can reduce fuel consumption. By optimizing the combustion process, the EGR system can improve the thermal efficiency of the engine to a certain extent, thereby reducing fuel consumption. Currently, about 30% of gasoline engines abroad use EGR technology to reduce fuel consumption. The core component applied in EGR technology is the EGR valve, and a sealing ring is usually provided outside the valve stem of the EGR valve. However, since the sealing ring will come into contact with the exhaust gas, harmful impurities and water vapor in the exhaust gas often come into contact with the sealing ring, easily causing damage to the sealing ring and affecting the sealing performance. Especially in the case of low temperatures, the water vapor in the exhaust gas will cause the sealing ring to freeze, affecting the sealing performance and service life.

[0004] In view of this, it is necessary to propose a new technical solution to overcome the deficiencies of the existing technology. Summary of the Utility Model

[0005] Based on this, the present application provides a valve structure that can protect the seal to enable the seal to have good sealing performance and service life.

[0006] To this end, the present application adopts the following technical solution: a valve structure, which includes a valve stem and a guide sleeve assembly sleeved outside the valve stem. A channel for fluid flow is formed below the guide sleeve assembly of the valve structure. The guide sleeve assembly includes a guide sleeve body, a seal assembled on the guide sleeve body, and a filter element arranged below the seal. The seal forms a seal between the valve stem and the guide sleeve body, and the filter element forms a filter between the seal and the channel to protect the seal.

[0007] In one embodiment, the guide sleeve assembly includes a mounting seat, which is assembled on the guide sleeve body and assembles the filter element, the seal and the guide sleeve body into an integral body.

[0008] In one embodiment, the seal includes an assembly part inserted into the guide sleeve body and a protruding part protruding from the lower end of the guide sleeve body.

[0009] In one embodiment, the guide sleeve body has an assembly groove that cooperates with the assembly part, and the diameter of the assembly groove is larger than the diameter of the valve stem.

[0010] In one embodiment, the inner side surface of the protruding part contacts the valve stem to form a seal.

[0011] In one embodiment, the mounting seat has a circumferential wall surrounding the protruding part, and the inner circumferential wall of the circumferential wall abuts against the outer circumferential wall of the protruding part.

[0012] In one embodiment, the mounting seat has a step part for supporting the protruding part.

[0013] In one embodiment, the guide sleeve assembly includes a support pad arranged between the seal and the filter element, and the support pad is supported on the step part.

[0014] In one embodiment, the filter element is a filter screen.

[0015] In one embodiment, the valve structure is an EGR valve, and the guide sleeve body is a copper sleeve.

[0016] For the valve structure provided by the present application, its guide sleeve assembly includes a seal and a filter element arranged below the seal. The seal forms a seal between the valve stem and the guide sleeve body, and the filter element forms a filter between the seal and the channel for fluid flow to reduce the contact between water vapor, impurities, etc. in the fluid and the seal, so as to protect the seal and improve the sealing performance and service life of the seal. Description of the Drawings

[0017] To more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0018] Figure 1 A perspective view of an embodiment of the valve structure of the present application.

[0019] Figure 2 A perspective view of another angle of an embodiment of the valve structure of the present application.

[0020] Figure 3 An exploded perspective view of an embodiment of the valve structure of the present application.

[0021] Figure 4 A perspective view of the guide sleeve assembly in an embodiment of the valve structure of the present application.

[0022] Figure 5 A cross-sectional view of the guide sleeve assembly in an embodiment of the valve structure of the present application.

[0023] The reference numerals of each component are as follows:

[0024] 100, valve structure; 101, passage; 1, valve stem; 2, guide sleeve assembly; 21, guide sleeve body; 210, guide shaft hole; 211, assembly groove; 22, mounting seat; 221, fixing part; 222, circumferential wall; 223, accommodating part; 224, step part; 23, seal; 231, assembly part; 232, protruding part; 24, filter element; 25, support pad; 3, valve body; 4, spring. Detailed implementation manners

[0025] To make the above objects, features, and advantages of the present application more obvious and understandable, the following will describe the detailed implementation manners of the present application in conjunction with the drawings. Many specific details are set forth in the following description in order to fully understand the present application. However, the present application can be implemented in many other ways different from those described herein. Those skilled in the art can make similar improvements without departing from the connotation of the present application. Therefore, the present application is not limited by the specific embodiments disclosed below.

[0026] It should be noted that when a component is referred to as "fixed to" or "disposed on" another component, it can be directly on the other component or there may also be an intermediate component. When a component is considered to be "connected to" another component, it can be directly connected to the other component or there may be an intermediate component at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in the specification of this application are only for illustrative purposes and do not represent the only implementation.

[0027] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of this application, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0028] In this application, unless otherwise clearly specified and limited, the first feature may be in direct contact with the second feature "on" or "under" the second feature, or the first feature and the second feature may be in indirect contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may mean that the first feature is directly above or obliquely above the second feature, or only indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature may mean that the first feature is directly below or obliquely below the second feature, or only indicates that the first feature has a lower horizontal height than the second feature.

[0029] Unless otherwise defined, all technical and scientific terms used in the specification of this application have the same meaning as commonly understood by those skilled in the technical field to which this application belongs. The terms used in the specification of this application are only for the purpose of describing specific implementations and are not intended to limit this application. The term "and / or" used in the specification of this application includes any and all combinations of one or more of the related listed items.

[0030] Please refer to Figures 1 to 5 As shown, this application provides a valve structure 100, which includes a valve stem 1 and a guide sleeve assembly 2 sleeved outside the valve stem 1. The valve structure 100 forms a channel 101 for fluid flow below the guide sleeve assembly 2. The guide sleeve assembly 2 includes a guide sleeve body 21, a seal 23 assembled on the guide sleeve body 21, and a filter element 24 disposed below the seal 23. The seal 23 forms a seal between the valve stem 1 and the guide sleeve body 21, and the filter element 24 forms a filter between the seal 23 and the channel 101 to protect the seal 23.

[0031] The valve structure 100 provided by the present application forms a filter between the sealing member 23 and the channel 101 for fluid circulation, so as to reduce the contact between water vapor, impurities, etc. in the fluid and the sealing member 23, protect the sealing member 23, and improve the sealing performance and service life of the sealing member 23.

[0032] Please refer to Figures 1 to 3 As shown, in one embodiment, the valve structure 100 is an EGR valve for realizing the circulation and emission control of exhaust gas, and the above-mentioned fluid is a gas. The valve structure 100 has a valve body 3, and a channel 101 for the gas to flow through is formed in the valve body 3. A valve core is connected to the valve rod 1, and the movement of the valve core is driven by the valve rod 1 to control the opening and closing of the channel 101, thereby realizing the circulation and emission control of exhaust gas. The valve rod 1 is generally a cylindrical rod body, which passes through the guide shaft hole 210 in the guide sleeve assembly 2 and can move up and down relative to the guide sleeve assembly 2.

[0033] Please refer to Figure 4 and Figure 5 As shown, in this embodiment, the guide sleeve assembly 2 includes a guide sleeve main body 21, a sealing member 23 assembled on the guide sleeve main body 21, a filter member 24 arranged below the sealing member 23, and a mounting seat 22 that assembles the filter member 24, the sealing member 23 and the guide sleeve main body 21 into an integral body. The mounting seat 22 is assembled on the guide sleeve main body 21 and the two are fixed. In this embodiment, the valve structure is an EGR valve, the guide sleeve main body 21 is a copper sleeve, the mounting seat 22 is a metal part, which is in the shape of a metal cylinder, and the mounting seat 22 is riveted and fixed to the guide sleeve main body 21. Specifically, the mouth part at the upper end of the mounting seat 22 constitutes a fixing part 221 to be fixed to the lower edge of the guide sleeve main body 21; the mounting seat 22 forms a circumferential wall 222 downward from the mouth part at the upper end, and a receiving part 223 is formed below the circumferential wall 222. Both the circumferential wall 222 and the receiving part 223 are cylindrical structures, and the diameter of the circumferential wall 222 is larger than the diameter of the receiving part 223, so as to form a step part 224 between the circumferential wall 222 and the receiving part 223. The circumferential wall 222 is correspondingly used to accommodate the sealing member 23, and the receiving part 223 is correspondingly used to accommodate the filter member 24.

[0034] Please refer to Figure 5As shown, the seal 23 includes a fitting portion 231 inserted into the guide sleeve body 21 and a protruding portion 232 protruding from the lower end of the guide sleeve body 21. The diameter of the protruding portion 232 is greater than that of the fitting portion 231. The cross-section of the seal 23 is generally in a "convex" shape. The guide sleeve body 21 has a fitting groove 211 that cooperates with the fitting portion 231 of the seal 23. The diameter of the fitting groove 211 is greater than the diameter of the valve stem 1, so that there is a gap between the fitting portion 231 and the valve stem 1 along the radial direction of the guide sleeve assembly 2 to prevent excessive interference between the fitting portion 231 assembled in the guide sleeve body 21 and the valve stem 1 from affecting the movement of the valve stem 1. In this embodiment, the fitting portion 231 corresponds to a section of the guide shaft hole 210, and the diameter of this section of the guide shaft hole 210 is not less than the diameter of the valve stem 1. In other words, the fitting portion 231 of the seal 23 is mainly used for the installation of the seal 23 and the guide sleeve body 21, and the sealing effect of the seal 23 on the valve stem 1 is mainly formed by the protruding portion 232 of the seal 23. Of course, in other embodiments, the fitting portion 231 can also be arranged to form a seal with the valve stem 1.

[0035] In this embodiment, the inner side surface of the protruding portion 232 contacts the valve stem 1 to form a seal. The circumferential wall 222 of the mounting seat 22 surrounds the protruding portion 232, and the inner circumferential wall of the circumferential wall 222 abuts against the outer circumferential wall of the protruding portion 232 to achieve sealing therebetween. When the valve stem 1 is inserted into the seal 23, the protruding portion 232 of the seal 23 is elastically squeezed and deformed between the valve stem 1 and the circumferential wall 222 to achieve sealing. The mounting seat 22 has a stepped portion 224 for supporting the protruding portion 232 to prevent the seal 23 from squeezing the filter element 24 when the valve stem 1 moves downward, resulting in deformation or damage of the filter element 24. The stepped portion 224 can directly contact the bottom surface of the protruding portion 232 to directly support the protruding portion 232, or can indirectly support the protruding portion 232 through other components or structures provided between the protruding portion 232 and the stepped portion 224. In this embodiment, the guide sleeve assembly 2 includes a support pad 25 disposed between the seal 23 and the filter element 24. The support pad 25 is supported on the stepped portion 224, and the stepped portion 224 indirectly supports the seal 23 through the support pad 25. The support pad 25 is an annular gasket made of a rigid material and serves as a separator and support between the seal 23 and the filter element 24.

[0036] In this embodiment, the filter element 24 is a filter screen. The mesh surface of the filter screen has mesh holes, and it is not easy for liquid to accumulate on the filter screen. Therefore, in a low-temperature environment, even if it freezes, it will not have a relatively thick thickness and will not form a solid ice block. The formed ice layer is very easy to break and melt, and can prevent or reduce the icing of water vapor on the seal 23 to protect the seal 23 and prevent the seal 23 from icing and affecting the sealing performance and the movement of the valve stem 1. The filter screen can also effectively prevent carbon deposits and other impurities from contacting the seal 23 upwards, and reduce the defects or damages caused by the hard objects in the impurities wearing the seal 23.

[0037] The assembly relationship between the guide sleeve assembly 2 and the valve structure 100 in an embodiment of the present application is as follows: The seal 23 is assembled at the lower end of the guide sleeve body 21. A support pad 25 and a filter element 24 are placed below the seal 23. The mounting seat 22 is sleeved outside the filter element 24, the support pad 25 and the seal 23, and is fixedly connected to the lower end of the guide sleeve body 21, thus forming the overall guide sleeve assembly 2; The guide sleeve assembly 2 is press-fitted and fixed in the valve body 3 by interference fit, and a spring 4 is sleeved on the guide sleeve body 21 of the guide sleeve assembly 2. The valve stem 1 is inserted into the guide shaft hole 210 formed in the middle of the guide sleeve assembly 2, thus forming the valve structure 100. During use, the flow control of the gas can be realized by driving the up and down movement of the valve stem 1.

[0038] From the description of the above specific embodiments, it can be seen that for the valve structure 100 provided by the present application, its guide sleeve assembly 2 includes a seal 23 and a filter element 24 arranged below the seal 23. The seal 23 forms a seal between the valve stem 1 and the guide sleeve body 21 to prevent the leakage of the exhaust gas flowing in the lower channel 101. The filter element 24 forms a filter between the seal 23 and the channel 101 for fluid flow, so as to reduce the contact between water vapor, impurities, etc. in the fluid and the seal 23, effectively reduce the damage of the seal 23 caused by icing at low temperature, protect the seal 23, and improve the sealing performance and service life of the seal 23.

[0039] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope described in this specification.

[0040] The above-described embodiments only represent several implementation manners of the present application. Their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the patent application. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several modifications and improvements can still be made, and these all belong to the protection scope of the present application. Therefore, the patent protection scope of the present application should be subject to the appended claims.

Claims

1. A valve structure, characterized in that: It comprises a valve stem (1) and a guide sleeve assembly (2) sleeved on the outside of the valve stem (1); the valve structure forms a channel (101) for fluid circulation below the guide sleeve assembly (2); the guide sleeve assembly (2) comprises a guide sleeve body (21), a sealing member (23) assembled on the guide sleeve body (21), and a filter member (24) arranged below the sealing member (23); the sealing member (23) forms a seal between the valve stem (1) and the guide sleeve body (21); the filter member (24) forms a filter between the sealing member (23) and the channel (101) to protect the sealing member (23).

2. The valve structure according to claim 1, characterized in that: The guide sleeve assembly (2) comprises a mounting seat (22), wherein the mounting seat (22) is assembled on the guide sleeve body (21), and the filter element (24), the sealing element (23) and the guide sleeve body (21) are assembled into a whole.

3. The valve structure according to claim 2, characterized in that: The sealing member (23) comprises a fitting portion (231) inserted into the guide sleeve body (21) and a protruding portion (232) protruding from the lower end of the guide sleeve body (21).

4. The valve structure according to claim 3, characterized in that: The guide sleeve body (21) has a mounting groove (211) that matches the mounting portion (231), and the diameter of the mounting groove (211) is greater than the diameter of the valve stem (1).

5. The valve structure according to claim 3 or 4, characterized in that: The inner side surface of the protruding portion (232) contacts the valve stem (1) to form a seal.

6. The valve structure according to claim 5, characterized in that: The mounting seat (22) has a circumferential wall (222) arranged around the protruding portion (232), and the inner circumferential wall of the circumferential wall (222) is in contact with the outer circumferential wall of the protruding portion (232).

7. The valve structure according to claim 3 or 4, characterized in that: The mounting seat (22) has a step portion (224) for supporting the protruding portion (232).

8. The valve structure according to claim 7, characterized in that: The guide sleeve assembly (2) comprises a support pad (25) arranged between the sealing element (23) and the filter element (24), and the support pad (25) is supported on the step portion (224).

9. The valve structure according to claim 8, characterized in that: The filter element (24) is a filter screen.

10. The valve structure according to claim 8, characterized in that: The valve structure is an EGR valve, and the guide sleeve body (21) is a copper sleeve.

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