one-way valve

Abstract

A one-way valve, comprising a valve body, the valve body having a valve cavity, the valve body being provided with an oil outlet; a valve seat, the valve seat being connected with the valve body, the valve seat being provided with an oil inlet; a valve core assembly, the valve core assembly being arranged in the valve cavity, a sealing structure being formed between the valve core assembly and the valve seat, the sealing structure being located between the oil outlet and the oil inlet, the sealing structure comprising a primary seal and a secondary seal, the primary seal and the secondary seal being arranged in sequence along the direction from the oil outlet to the oil inlet; the valve core assembly and the valve seat having a shaft hole fitting area, the valve core assembly and the valve seat being in shaft hole fitting in the shaft hole fitting area, the shaft hole fitting area comprising a first area, the first area being located between the primary seal and the secondary seal. The one-way valve provided by the embodiment of the utility model has better sealing performance and can realize higher sealing effect.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic valve technology, and in particular to a one-way valve. Background Technology

[0002] Check valves effectively prevent reverse oil flow when used in hydraulic systems. When a hydraulic system or actuator (such as a hydraulic cylinder) requires pressure holding, a general-purpose check valve or a pilot-operated check valve is often chosen to achieve this function. The seal of a check valve is typically a line seal formed by the cooperation of the valve core and seat. However, a simple line seal cannot meet high sealing requirements, resulting in poor sealing performance of the check valve.

[0003] Therefore, there is an urgent need to provide a check valve that can improve the sealing performance of check valves. Utility Model Content

[0004] The technical problem solved by this utility model is to provide a one-way valve that adopts double sealing, which is beneficial to improving the sealing performance of the one-way valve and effectively achieving a good sealing effect.

[0005] To solve the above-mentioned technical problems, this utility model provides a one-way valve, comprising: a valve body having a valve cavity and an oil outlet; a valve seat connected to the valve body and having an oil inlet; a valve core assembly disposed within the valve cavity, a sealing structure forming between the valve core assembly and the valve seat, the sealing structure being located between the oil outlet and the oil inlet, the sealing structure including a primary seal and a secondary seal, the primary seal and the secondary seal being sequentially arranged along the direction from the oil outlet to the oil inlet; the valve core assembly having a shaft hole mating area, the valve core assembly and the valve seat in the shaft hole mating area being in a shaft hole mating relationship, the shaft hole mating area including a first area, the first area being located between the primary seal and the secondary seal.

[0006] Optionally, the valve core assembly includes a valve core body and a spring, with one end of the valve core body connected to the spring.

[0007] Optionally, the valve core assembly further includes a valve stem, and the spring, the valve core body, and the valve stem are arranged sequentially along the direction from the oil outlet to the oil inlet, with the valve stem connected to the other end of the valve core body.

[0008] Optionally, the valve core body has a conical sealing surface, and the valve seat has an annular sealing surface, wherein the conical sealing surface abuts against the annular sealing surface to form the primary seal.

[0009] Optionally, the valve core body is provided with an annular groove, and a sealing ring is embedded in the annular groove. The sealing ring is clamped between the outer side of the valve core body and the inner side of the valve seat to form the secondary seal.

[0010] Optionally, when the one-way valve is in the closed state, the sealing ring is partially clamped between the outer side of the valve core body and the inner side of the valve seat.

[0011] Optionally, in the axial direction parallel to the valve cavity, the width of the first region is greater than the width of the portion of the sealing ring sandwiched between the outer side of the valve core body and the inner side of the valve seat.

[0012] Optionally, a cavity is formed between the valve core body and the inner side of the valve seat, and the cavity exposes the portion of the sealing ring that is not held by the valve core body and the valve seat.

[0013] Optionally, the shaft hole mating area further includes a second area, and the secondary seal is located between the first area and the second area.

[0014] Optionally, in the axial direction parallel to the valve cavity, the width of the first region is greater than or equal to the width of the second region.

[0015] Compared with the prior art, the technical solution of this utility model embodiment has the following beneficial effects:

[0016] The check valve provided by this technical solution has a primary seal and a secondary seal between the oil outlet and the oil inlet. The two seals work together to provide a sealing effect, further improving the sealing performance of the check valve. In addition, a first zone with a shaft hole fit is provided between the primary seal and the secondary seal. The valve core assembly and the valve seat in the first zone have a shaft hole fit. In the initial opening of the check valve, the first zone can ensure that there is no excessive pressure or flow impact on the secondary seal, which can reduce the damage caused by large flow impact to the secondary seal, and help extend the service life of the secondary seal, thereby improving the sealing performance of the check valve.

[0017] Furthermore, along the direction from the oil outlet to the oil inlet, the width of the first region is greater than the width of the portion of the sealing ring sandwiched between the outer side of the valve core body and the inner side of the valve seat. When the one-way valve opens, the valve core assembly moves along the direction from the oil inlet to the oil outlet. Before the valve core assembly and the valve seat in the first region are completely separated, the sealing ring of the secondary seal has already separated from the valve seat. As the valve core assembly continues to move until the valve core is fully open, the large flow of oil passing through the secondary seal will no longer damage the secondary seal. Attached Figure Description

[0018] Figure 1 This is a cross-sectional structural diagram of a one-way valve in one embodiment of the present invention;

[0019] Figure 2 yes Figure 1 An enlarged schematic diagram of the structure within the dashed box shown;

[0020] Figures 3 to 5 This diagram shows a cross-sectional view of the opening process of a one-way valve port in one embodiment of the present invention. Detailed Implementation

[0021] As described in the background section, current check valves typically achieve pressure holding by forming a line seal through the interaction of a cone valve core and a valve seat. However, in actual use, the pressure holding effect is often poor. This is partly due to machining errors that result in poor sealing of the line seal structure, and partly due to damage caused by oil impacts and impurities in the oil during prolonged use, leading to failure of the line seal structure and thus affecting the pressure holding effect of the check valve.

[0022] To address the aforementioned problems, this utility model provides a one-way valve. The sealing structure of the one-way valve is positioned between the oil inlet and the oil outlet. When the one-way valve is closed, it prevents oil from flowing from the oil outlet to the oil inlet. The sealing structure includes a primary seal and a secondary seal. This dual-seal structure improves the sealing performance of the one-way valve and further enhances the sealing effect. Additionally, a first zone with a shaft-hole fit is provided between the primary and secondary seals. The valve core assembly and valve sleeve in the first zone have a shaft-hole fit. During the initial opening of the one-way valve, when the primary seal begins to separate, the presence of the first zone prevents high-pressure, high-flow-rate oil from directly impacting the secondary seal, reducing damage to the secondary seal during valve opening and extending its service life. This, in turn, improves the service life of the one-way valve.

[0023] To make the above-mentioned objectives, features and beneficial effects of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0024] Figure 1 This is a cross-sectional structural diagram of a one-way valve in one embodiment of the present invention; Figure 2 yes Figure 1 An enlarged schematic diagram of the structure within the dashed box shown; Figures 3 to 5 This diagram shows a cross-sectional view of the opening process of a one-way valve port in one embodiment of the present invention.

[0025] Reference Figure 1 and Figure 2The one-way valve 10 includes: a valve body 100 having a valve cavity 101 and an oil outlet C; a valve seat 200 connected to the valve body 100 and having an oil inlet V; and a valve core assembly 300 disposed within the valve cavity 101, forming a sealing structure between the valve core assembly 300 and the valve seat 200, the sealing structure being located between the oil outlet C and the oil inlet V. The sealing structure includes a primary seal 401 and a secondary seal 402, which are arranged sequentially along the direction from the oil outlet C to the oil inlet V. The valve core assembly 300 has a shaft hole mating area, in which the valve core assembly 300 and the valve seat 200 are mated by a shaft hole. The shaft hole mating area includes a first area 501, which is located between the primary seal 401 and the secondary seal 402.

[0026] Reference Figure 1 and Figure 3 In this embodiment, the valve core assembly 300 reciprocates axially within the valve cavity 101. When the one-way valve 10 is in the closed state, the sealing structures of the valve core assembly 300 and the valve seat 200 come into contact with each other to form a seal. When the one-way valve 10 is in the open state, the sealing structures of the valve core assembly 300 and the valve seat 200 separate, and the oil can flow from the oil inlet V to the oil outlet C.

[0027] In this embodiment, the opening direction of the one-way valve 10 is the first direction X, which is parallel to the movement direction of the valve core assembly 300. The direction from the oil outlet C to the oil inlet V is the second direction, which is parallel to and opposite to the first direction X.

[0028] Continue to refer to Figure 1 The valve core assembly 300 includes a valve core body 301, a valve stem 302, and a spring 303. The spring 303, the valve core body 301, and the valve stem 302 are arranged sequentially along the direction from the oil outlet C to the oil inlet V. One end of the valve core body 301 is connected to the spring 303, and the other end of the valve core body 301 is connected to the valve stem 302.

[0029] In this embodiment, the spring 303, the valve core body 301, and the valve stem 302 are arranged sequentially along the second direction. The spring 303 is connected to the valve body 100, and the valve stem 302 is connected to the valve seat 200.

[0030] In this embodiment, the one-way valve 10 is a hydraulically controlled one-way valve. The hydraulically controlled one-way valve can be opened in two ways: one is that oil enters from the oil inlet V, and the oil pushes the valve core assembly 300 in the first direction X, compressing the spring 303, so that the sealing structure is separated and the channel from the oil inlet V to the oil outlet C is opened; the other is that the valve stem 302 is pushed in the first direction X, compressing the spring 303, so that the sealing structure is separated. At this time, the one-way valve 10 can be reversed, that is, the oil can flow from the oil outlet C to the oil inlet V.

[0031] In other embodiments, the one-way valve 10 may also be a general one-way valve, excluding the valve stem 302. A general one-way valve cannot achieve reverse conduction by pushing the valve stem.

[0032] In this embodiment, the sealing structure includes a primary seal 401 and a secondary seal 402, which adds an extra layer of protection to the sealing effect of the one-way valve 10, thereby improving sealing performance and achieving a better sealing effect.

[0033] Continue to refer to Figure 1 and Figure 2 The valve core body 301 has a conical sealing surface 304, and the valve seat 200 has an annular sealing surface 201. The conical sealing surface 304 abuts against the annular sealing surface 201 to form the primary seal 401.

[0034] In this embodiment, the conical sealing surface 304 and the annular sealing surface 201 contact each other to form a line seal, preventing the oil from flowing from the oil outlet C to the oil inlet V, and the one-way valve 10 is in the closed state.

[0035] Continue to refer to Figure 1 and Figure 2 The valve core body 301 is provided with an annular groove, and a sealing ring 403 is embedded in the annular groove. The sealing ring 403 is sandwiched between the outer side of the valve core body 301 and the inner side of the valve seat 200 to form the secondary seal 402.

[0036] In this embodiment, the sealing ring 403 is tightly embedded in the annular groove, and the outer ring of the sealing ring 403 is tightly fitted with the inner side of the valve seat 200, thus achieving a sealing effect.

[0037] In this embodiment, the secondary seal 402 is disposed between the primary seal 401 and the oil inlet V. The secondary seal 402 is added on the basis of the primary seal 401. The primary seal 401 adopts a line seal, and the secondary seal 402 adopts a radial seal in the form of a sealing ring. It does not affect the closing of the primary seal. Both of them play a sealing role at the same time, which improves the sealing performance of the one-way valve 10 and can better achieve the pressure holding effect of the one-way valve 10.

[0038] The sealing ring 403 is made of polymer materials, such as silicone, rubber, polytetrafluoroethylene, polyurethane, etc.

[0039] In this embodiment, the valve core assembly 300 and the valve seat 200 in the shaft hole mating area are in a shaft hole mating relationship. Specifically, the outer side of the valve core body 301 and the inner side of the valve seat 200 are in a shaft hole mating relationship, and the shaft hole mating relationship is a clearance fit.

[0040] The clearance range of the shaft-hole fit is between 0 and 0.4 mm.

[0041] In this embodiment, the shaft hole mating area includes a first area 501 and a second area 502. The first area 501 and the second area 502 are located on both sides of the secondary seal 402, respectively. The first area 501 is disposed between the primary seal 401 and the secondary seal 402, and the second area 502 is disposed between the secondary seal 402 and the oil inlet V.

[0042] In this embodiment, a cavity 600 is formed between the valve core body 301 and the inner side of the valve seat 200, and the cavity 600 exposes the portion of the sealing ring 403 that is not clamped by the valve core body 301 and the valve seat 200.

[0043] In this embodiment, there is a gap between the valve core body 301 and the valve seat 200 in the shaft hole mating area. At the initial opening of the one-way valve 10, the oil present at the oil outlet C can slowly flow through the first zone 501 to the secondary seal 402, avoiding the secondary seal 402 from being directly impacted by the high pressure and flow rate of the oil, and preventing the sealing ring 403 of the secondary seal 402 from being damaged due to the excessive imbalance of oil pressure distribution on both sides, which is beneficial to improving the service life of the sealing ring 403.

[0044] In this embodiment, the second zone 502 serves as a sealing ring groove. In the initial opening of the one-way valve 10, due to the presence of the second zone 502, the cavity 600 remains a sealed space. As the valve core assembly 300 moves along the first direction X, the space of the cavity 600 increases, and the pressure inside the cavity 600 decreases, thereby reducing the pressure on the sealing ring 403 and preventing the sealing ring 403 from opening under high pressure and causing damage to the sealing ring 430.

[0045] In this embodiment, when the one-way valve 10 is in the closed state (refer to...) Figure 1 The sealing ring 403 is partially sandwiched between the outer side of the valve core body 301 and the inner side of the valve seat 200.

[0046] Specifically, in the first direction X, the outer ring portion of the sealing ring 403 contacts the valve seat 200.

[0047] In other embodiments, when the one-way valve 10 is in the closed state, the sealing ring 403 can also be completely clamped between the outer side of the valve core body 301 and the inner side of the valve seat 200, which can achieve a better sealing effect.

[0048] In this embodiment, in a direction parallel to the axial direction of the valve cavity 101, the width of the first region 501 is greater than the width of the portion of the sealing ring 403 sandwiched between the outer side of the valve core body 301 and the inner side of the valve seat 200.

[0049] The width of the first region 501 and the width of the sealing ring 403 both refer to the width parallel to the first direction X.

[0050] refer to Figures 3 to 5 In this embodiment, the width of the first zone 501 is set to be larger. During the opening process of the one-way valve 10, when the sealing ring 403 is completely separated from the valve seat 200, the valve core body 301 and the valve seat 200 of the first zone 501 are not completely separated. The oil is still slowly flowing through the gap to the sealing ring 403. The valve core assembly 300 continues to move along the first direction X until the valve core body 301 and the valve seat 200 of the first zone 501 and the second zone 502 are completely separated. At this time, the valve is fully opened. When a large flow of oil passes through, it will not damage the sealing ring 403, which can extend the service life of the sealing ring 403 and improve the sealing performance.

[0051] In this embodiment, the cavity 600 has a buffering effect when the one-way valve 10 is closed. When the one-way valve 10 is closed, the oil inlet V no longer receives oil or there is no external force pushing the valve stem 302. Under the elastic force of the spring 302, the valve core assembly 300 moves in the second direction. Before the secondary seal 402 contacts and forms a seal, the oil in the cavity 600 slowly flows out through the gap between the first zone 501 and the second zone 502. The valve core assembly 300 continues to move in the second direction until the secondary seal 402 contacts and forms a seal. The oil in the cavity 600 then slowly flows out only through the gap in the first zone 501, which is opposite to the force of the spring 302. This creates a buffering effect for the valve core closure, which helps to improve the stability of the one-way valve 10 closure, avoids damage to the primary seal 401 under violent impact, and extends the service life of the primary seal 401.

[0052] While the present invention has been disclosed above, it is not limited thereto. Any person skilled in the art can make various modifications and alterations without departing from the spirit and scope of the present invention; therefore, the scope of protection of the present invention should be determined by the scope defined in the claims.

Claims

1. A one-way valve, characterized in that, include: The valve body has a valve cavity and an oil outlet. A valve seat, which is connected to the valve body, is provided with an oil inlet; A valve core assembly is disposed within the valve cavity, and a sealing structure is formed between the valve core assembly and the valve seat. The sealing structure is located between the oil outlet and the oil inlet, and the sealing structure includes a primary seal and a secondary seal, which are arranged sequentially along the direction from the oil outlet to the oil inlet. The valve core assembly has a shaft hole mating area, and the valve core assembly and the valve seat in the shaft hole mating area are in shaft hole mating. The shaft hole mating area includes a first area, which is located between the primary seal and the secondary seal.

2. The one-way valve as described in claim 1, characterized in that, The valve core assembly includes a valve core body and a spring, with one end of the valve core body connected to the spring.

3. The one-way valve as described in claim 2, characterized in that, The valve core assembly also includes a valve stem. The spring, the valve core body, and the valve stem are arranged sequentially along the direction from the oil outlet to the oil inlet. The valve stem is connected to the other end of the valve core body.

4. The one-way valve as described in claim 2, characterized in that, The valve core body has a conical sealing surface, and the valve seat has an annular sealing surface. The conical sealing surface and the annular sealing surface abut against each other to form the primary seal.

5. The one-way valve as described in claim 2, characterized in that, The valve core body is provided with an annular groove, and a sealing ring is embedded in the annular groove. The sealing ring is sandwiched between the outer side of the valve core body and the inner side of the valve seat to form the secondary seal.

6. The one-way valve as described in claim 5, characterized in that, When the one-way valve is in the closed state, the sealing ring is partially clamped between the outer side of the valve core body and the inner side of the valve seat.

7. The one-way valve as described in claim 6, characterized in that, In the axial direction parallel to the valve cavity, the width of the first region is greater than the width of the portion of the sealing ring sandwiched between the outer side of the valve core body and the inner side of the valve seat.

8. The one-way valve as described in claim 6, characterized in that, A cavity is formed between the valve core body and the inner side of the valve seat, and the cavity exposes the portion of the sealing ring that is not held by the valve core body and the valve seat.

9. The one-way valve as described in claim 1, characterized in that, The shaft hole mating area also includes a second area, and the secondary seal is located between the first area and the second area.

10. The one-way valve as described in claim 9, characterized in that, In the axial direction parallel to the valve cavity, the width of the first region is greater than or equal to the width of the second region.

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