Soft and hard dual-seal valve body

Abstract

The utility model belongs to the technical field of hydraulic valves, and discloses a soft and hard dual-seal valve body. The soft and hard dual-seal valve body comprises a valve seat and a cone valve element, the valve seat comprises a first conical surface, the cone valve element comprises a second conical surface, the cone valve element is arranged in the valve seat, the second conical surface can abut against the first conical surface, the part, making contact with the first conical surface, of the second conical surface is a first contact part, the cone valve element is sleeved with a sealing piece, and the sealing piece can abut against the first conical surface. The part, making contact with the sealing piece, of the first conical surface is a second contact part. By combining the two mechanisms of hard sealing and soft sealing, the soft and hard dual-sealing valve body can effectively reduce and even eliminate the leakage phenomenon, one of the hard sealing mode and the soft sealing mode is still in an effective state even under the limit condition, the qualification of the sealing performance of the soft and hard dual-sealing valve body is guaranteed, and the sealing performance of the valve body is improved. On the occasion with the extremely high requirement for the sealing performance, the reliability and safety of the system can be remarkably improved, and the accident risk caused by leakage is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of hydraulic valves, in particular to a valve body with double hard and soft seals. Background Art

[0002] At present, hydraulic valves usually adopt a single sealing structure. In actual applications, poor sealing may occur, resulting in an increase in leakage. Since the valve seat is fixed by threaded connection and the valve core reciprocates within the valve seat, there is always a gap in the lateral direction. When the sealing position between the spherical surface and the conical surface of the valve core changes from circular line sealing to elliptical line sealing, and when part of the sealing line exceeds the fit between the spherical surface and the conical surface, the seal fails and a large amount of leakage occurs. For occasions requiring zero leakage, a single sealing structure cannot ensure the sealing effect in the long term.

[0003] Therefore, it is necessary to provide a valve body with double hard and soft seals to solve the above problems. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a valve body with double hard and soft seals, which combines two mechanisms of hard seal and soft seal. In extreme cases, either the hard seal form or the soft seal form is always in an effective state, ensuring the qualified sealing performance of the valve body with double hard and soft seals.

[0005] To achieve this purpose, the utility model adopts the following technical solutions:

[0006] A valve body with double hard and soft seals, comprising:

[0007] A valve seat, the valve seat including a first conical surface;

[0008] A conical valve core, the conical valve core including a second conical surface, the conical valve core being arranged within the valve seat, the second conical surface being capable of abutting against the first conical surface, a part of the second conical surface in contact with the first conical surface being a first contact part, a sealing member being sleeved on the conical valve core, the sealing member being capable of abutting against the first conical surface, and a part of the first conical surface in contact with the sealing member being a second contact part.

[0009] Preferably, the first contact part is located at 1 / 3 of the second conical surface along the Z-axis direction from top to bottom.

[0010] Preferably, a groove is formed on the conical valve core, and the sealing member is arranged within the groove.

[0011] Preferably, the difference between the outer diameter and the inner diameter of the sealing member is D, and the distance between the bottom surface of the groove and the second contact part along the X-axis direction is 0.94D.

[0012] Preferably, the conical angle of the first conical surface is 74° - 76°.

[0013] Preferably, the conical surface angle of the second conical surface is 49°-51°.

[0014] Preferably, the material of the seal is fluororubber or hydrogenated nitrile rubber.

[0015] Preferably, the material of the seal is polyurethane composite material.

[0016] Preferably, the surface finish of the first conical surface is not greater than 0.4 μm.

[0017] Preferably, the surface finish of the second conical surface is not greater than 0.2 μm.

[0018] Advantages of the present utility model:

[0019] This hard and soft double-sealed valve body includes a valve seat and a conical valve core. The valve seat includes a first conical surface, the conical valve core includes a second conical surface, the conical valve core is arranged in the valve seat, the second conical surface can be in contact with the first conical surface, the part of the second conical surface in contact with the first conical surface is the first contact part, a seal is sleeved on the conical valve core, the seal can be in contact with the first conical surface, and the part of the first conical surface in contact with the seal is the second contact part.

[0020] This hard and soft double-sealed valve body realizes hard sealing through the metal-to-metal contact between the second conical surface of the conical valve core and the first conical surface in the valve seat. When the conical valve core reciprocates in the valve seat, the second conical surface can be in contact with the first conical surface to prevent fluid from passing through; this hard and soft double-sealed valve body realizes soft sealing through the contact between the seal and the first conical surface in the valve seat. Through the elastic deformation ability of the seal, a tight sealing effect can be achieved to prevent fluid from passing through. By combining the two mechanisms of hard sealing and soft sealing, the hard and soft double-sealed valve body can effectively reduce or even eliminate the leakage phenomenon. Even in extreme cases, either the hard sealing form or the soft sealing form is still in an effective state, ensuring the qualified sealing performance of the hard and soft double-sealed valve body. In occasions with extremely high requirements for sealing performance, it can significantly improve the reliability and safety of the system and reduce the accident risk caused by leakage. Description of the drawings

[0021] Figure 1 is a cross-sectional schematic view of the hard and soft double-sealed valve body provided by the present utility model.

[0022] In the figure:

[0023] 1. Valve seat; 11. First conical surface; 111. Second contact part;

[0024] 2. Conical valve core; 21. Second conical surface; 211. First contact part; 22. Groove;

[0025] 3. Seal. Detailed implementation manners

[0026] The present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present utility model, rather than limiting the present utility model. In addition, it should be noted that for the convenience of description, only the parts related to the present utility model rather than all the structures are shown in the drawings.

[0027] In the description of the present utility model, unless otherwise clearly defined and limited, the terms "connected", "connected to", and "fixed" shall be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0028] In the present utility model, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features between them. Moreover, the first feature being "above", "above the top of", and "on the top of" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below", "below the bottom of", and "under the bottom of" the second feature includes the first feature being directly below and obliquely below the second feature, or merely indicating that the horizontal height of the first feature is lower than that of the second feature.

[0029] In the description of this embodiment, the orientation or positional relationships such as "above", "below", "right", etc. are based on the orientation or positional relationships shown in the drawings. It is only for the convenience of description and simplifying the operation, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be understood as a limitation to the present utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meanings.

[0030] At present, hydraulic valves usually adopt a single sealing structure. In actual applications, there will be poor sealing, resulting in an increase in the leakage amount. Since the valve seat is fixed by threaded connection and the valve core reciprocates within the valve seat, there will always be a gap in the transverse direction. In extreme cases, the sealing position between the spherical surface and the conical surface of the valve core changes from circular line sealing to elliptical line sealing. When part of the sealing line exceeds the fit between the spherical surface and the conical surface, the sealing fails and a large amount of leakage occurs. For occasions requiring zero leakage, a single sealing structure cannot ensure the sealing effect in the long term.

[0031] To solve the above problems, asFigure 1 As shown in the figure, this embodiment provides a hard and soft double-sealed valve body. This hard and soft double-sealed valve body includes a valve seat 1 and a conical valve core 2. The valve seat 1 includes a first conical surface 11, and the conical valve core 2 includes a second conical surface 21. The conical valve core 2 is arranged inside the valve seat 1, and the second conical surface 21 can abut against the first conical surface 11. The part where the second conical surface 21 contacts the first conical surface 11 is the first contact part 211. A sealing member 3 is sleeved on the conical valve core 2, and the sealing member 3 can abut against the first conical surface 11. The part where the first conical surface 11 contacts the sealing member 3 is the second contact part 111.

[0032] This hard and soft double-sealed valve body realizes hard sealing through the metal-to-metal contact between the second conical surface 21 of the conical valve core 2 and the first conical surface 11 inside the valve seat 1. When the conical valve core 2 reciprocates inside the valve seat 1, the second conical surface 21 can abut against the first conical surface 11 to prevent fluid from passing through. This hard and soft double-sealed valve body realizes soft sealing through the contact between the sealing member 3 and the first conical surface 11 inside the valve seat 1. Through the elastic deformation ability of the sealing member 3, a tight sealing effect can be achieved to prevent fluid from passing through. By combining the two mechanisms of hard sealing and soft sealing, the hard and soft double-sealed valve body can effectively reduce or even eliminate the leakage phenomenon. Even in extreme cases, either the hard sealing form or the soft sealing form is still in an effective state, ensuring the qualified sealing performance of the hard and soft double-sealed valve body. In occasions with extremely high requirements for sealing performance, it can significantly improve the reliability and safety of the system and reduce the accident risk caused by leakage.

[0033] Specifically, as Figure 1 shown, the first contact part 211 is located at the upper one-third of the second conical surface 21 along the Z-axis direction. Compared with making the first contact part 211 located in the middle or lower part of the second conical surface 21, this position at the one-third can provide a longer sealing line, which means there are more contact points, and this helps to improve the reliability and stability of the seal.

[0034] In this embodiment, as Figure 1 shown, a groove 22 is formed on the conical valve core 2, and the sealing member 3 is arranged in the groove 22. The groove 22 provides a stable installation environment for the sealing member 3, so that the sealing member 3 can be accommodated in the groove 22 without generating displacement along the Z-axis direction.

[0035] Specifically, the difference between the outer diameter and the inner diameter of the sealing member 3 is D, and the distance between the bottom surface of the groove 22 and the second contact part 111 along the X-axis direction is 0.94D. That is to say, the compression amount of the sealing member 3 is 0.06D, so that the sealing member 3 can closely fit on the first conical surface 11 to form an effective soft seal.

[0036] In this embodiment, the cone angle of the first conical surface 11 is 74° - 76°. The design of the cone angle within this range helps to form a stable sealing line, reduce the possibility of leakage, and can reduce the relative movement and friction between the first conical surface 11 and the second conical surface 21, reduce the wear efficiency, and extend the service life of this hard and soft double-sealed valve body. Exemplarily, the cone angle of the first conical surface 11 is 75°.

[0037] It should be noted that the runout tolerance of the first conical surface 11 does not exceed 20 μm, and the roundness tolerance does not exceed 4 μm. The control of the runout tolerance ensures that the first conical surface 11 can maintain close contact with the second conical surface 21 when rotating or under pressure, thus effectively preventing medium leakage; the control of the roundness tolerance guarantees the shape accuracy of the first conical surface 11, making its contact with the second conical surface 21 uniform in all directions, and further reducing the risk of leakage.

[0038] In this embodiment, the cone angle of the second conical surface 21 is 49° - 51°. The cone angle within this range can ensure a tight sealing contact is formed between the cone valve core 2 and the valve seat 1, effectively preventing fluid leakage, and the cone angle within this range can make the fluid form a relatively stable flow field when passing through the cone valve, reducing the occurrence of eddy currents and turbulence phenomena, thereby reducing energy loss and noise. Exemplarily, the cone angle of the second conical surface 21 is 50°.

[0039] It should be noted that the runout tolerance of the second conical surface 21 does not exceed 20 μm, and the roundness tolerance does not exceed 4 μm. The control of the runout tolerance ensures that the second conical surface 21 can maintain close contact with the first conical surface 11 when rotating or under pressure, thus effectively preventing medium leakage; the control of the roundness tolerance guarantees the shape accuracy of the second conical surface 21, making its contact with the first conical surface 11 uniform in all directions, and further reducing the risk of leakage.

[0040] Specifically, the surface finish of the first conical surface 11 is not greater than 0.4 μm. The surface of the first conical surface 11 is smooth, reducing the microscopic unevenness with the second conical surface 21, thereby enhancing the sealing effect, helping to form a closer contact, and reducing the risk of leakage.

[0041] Specifically, the surface finish of the second conical surface 21 is not greater than 0.2 μm. The surface of the second conical surface 21 is smooth, reducing the microscopic unevenness with the first conical surface 11, thereby enhancing the sealing effect, helping to form a closer contact, and reducing the risk of leakage.

[0042] In some embodiments, the material of the seal 3 is fluororubber or hydrogenated nitrile rubber. Both fluororubber material and hydrogenated nitrile rubber material have good heat resistance and can maintain excellent elasticity and sealing performance in high-temperature environments.

[0043] In some other embodiments, the sealing member 3 is made of a polyurethane composite material. The polyurethane composite material is not easily invaded by external substances. Even if there is oil or foreign matter adhered to its surface, it can be easily scraped off, thus maintaining the sealing effect. Under the same conditions, the sealing member 3 made of the polyurethane composite material has a longer service life.

[0044] Obviously, the above-mentioned embodiments of the present invention are merely examples for clearly illustrating the present invention, rather than limitations on the implementation manners of the present invention. For those of ordinary skill in the art, various obvious changes, re-adjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to enumerate all the implementation manners here. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention shall be included within the protection scope of the claims of the present invention.

Claims

1. A soft and hard double sealing valve body, characterized in that: include: A valve seat (1), the valve seat (1) comprising a first conical surface (11); A conical valve core (2), the conical valve core (2) comprising a second conical surface (21), the conical valve core (2) being arranged in the valve seat (1), the second conical surface (21) being capable of abutting against the first conical surface (11), the portion where the second conical surface (21) contacts the first conical surface (11) being a first contact portion (211), the conical valve core (2) being sleeved with a sealing member (3), the sealing member (3) being capable of abutting against the first conical surface (11), the portion where the first conical surface (11) contacts the sealing member (3) being a second contact portion (111).

2. The soft and hard double sealing valve body according to claim 1, characterized in that: The first contact portion (211) is located at 1 / 3 of the second conical surface (21) from top to bottom along the Z-axis direction.

3. The soft and hard double sealing valve body according to claim 1, characterized in that: The cone valve core (2) is provided with a groove (22), and the sealing element (3) is arranged in the groove (22).

4. The soft and hard double sealing valve body according to claim 3, characterized in that: The difference between the inner and outer diameters of the sealing member (3) is D, and the distance between the bottom surface of the groove (22) and the second contact portion (111) along the X-axis direction is 0.94D.

5. The soft and hard double sealing valve body according to any one of claims 1 to 4, characterized in that: The cone angle of the first cone surface (11) is 74°-76°.

6. The soft and hard double sealing valve body according to any one of claims 1 to 4, characterized in that: The cone angle of the second cone surface (21) is 49°-51°.

7. The soft and hard double sealing valve body according to any one of claims 1 to 4, characterized in that: The material of the sealing element (3) is fluororubber or hydrogenated nitrile rubber.

8. The soft and hard double sealing valve body according to any one of claims 1 to 4, characterized in that: The material of the sealing element (3) is a polyurethane composite material.

9. The soft and hard double sealing valve body according to any one of claims 1 to 4, characterized in that: The smoothness of the first tapered surface (11) is no greater than 0.4 μm.

10. The soft and hard double sealing valve body according to any one of claims 1 to 4, characterized in that: The smoothness of the second tapered surface (21) is no greater than 0.2 μm.

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