Hydraulic one-way valve

Abstract

The utility model provides a hydraulic one-way valve which comprises a valve body, a valve element, an elastic piece and a cover body. A runner is arranged in the valve body, and a mounting hole for inserting the valve core is formed in the valve body; the valve element is arranged in the mounting hole in a sliding manner, and a limiting part and a sealing part are arranged on the valve element; the elastic piece is arranged on the valve element in a sleeving mode and located between the valve body and the limiting part, and the elastic piece can abut against and push the valve element so that the sealing part can seal an outlet of the flow channel. The cover body is connected to the valve body, and the cover body and the valve body jointly define a cavity for containing the elastic piece and the limiting part. According to the hydraulic one-way valve, the cover body is arranged to be connected with the valve body, the cavity for containing the elastic piece and the limiting part is formed between the cover body and the valve body, the elastic piece and the limiting part can be limited in the cavity, when the elastic piece or the limiting part is damaged and fractured and partially falls off, the falling-off part can still be intercepted in the cavity, and therefore the hydraulic one-way valve is not prone to falling off. The elastic part is not easy to enter a hydraulic system to flow along with hydraulic oil, and the influence on the hydraulic system when the elastic part or the limiting part is broken is reduced.

Description

Technical Field

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

[0002] A hydraulic check valve is a hydraulic component used in hydraulic systems. It ensures that fluid flowing through its body can only flow from the inlet to the outlet, preventing backflow. Due to its anti-backflow characteristic, check valves are used in various hydraulic tools and equipment. The common working principle of a hydraulic check valve is as follows: When hydraulic oil flows into the check valve from the inlet, the oil pressure overcomes the spring force inside the valve, pushing the valve core to open the valve and allowing oil to flow smoothly out from the outlet. When hydraulic oil attempts to flow back from the outlet, the oil pressure presses the valve core firmly against the valve body, and combined with the spring force, keeps the check valve closed, preventing oil from flowing through and thus achieving a one-way shut-off function.

[0003] Hydraulic check valves operate at high frequencies in hydraulic systems. After prolonged operation or exposure to external factors, their springs may break into pieces. These broken spring fragments can enter the hydraulic system, posing a risk of oil circuit blockage. Utility Model Content

[0004] In view of this, the present invention aims to provide a hydraulic check valve to reduce the risk of oil circuit blockage.

[0005] To achieve the above objectives, the technical solution of this utility model is implemented as follows:

[0006] A hydraulic check valve includes a valve body, a valve core, an elastic element, and a cover;

[0007] The valve body has a flow channel and a mounting hole for inserting the valve core.

[0008] The valve core is slidably disposed in the mounting hole, and the valve core is provided with a limiting part and a sealing part;

[0009] The elastic element is sleeved on the valve core and located between the valve body and the limiting part, and the elastic element can push against the valve core so that the sealing part seals the outlet of the flow channel;

[0010] The cover is connected to the valve body, and the cover and the valve body together form a cavity that accommodates the elastic element and the limiting part.

[0011] Furthermore, the valve core includes a seal and an adjusting element connected together;

[0012] The sealing part is disposed on the sealing member, the limiting part is disposed on the adjusting member, and the adjusting member can adjust the connection position between itself and the sealing member along its own axial direction.

[0013] Furthermore, the adjusting member and the sealing member are screwed together.

[0014] Furthermore, the adjusting component is made of hexagon socket head cap screw, and the nut of the hexagon socket head cap screw constitutes the limiting part.

[0015] Furthermore, the valve body is provided with a stepped hole arranged coaxially with the mounting hole, and one end of the seal can slide within the stepped hole.

[0016] Furthermore, the valve body is tubular, the mounting hole is coaxially arranged with the valve body, and the flow channel is a plurality of channels distributed circumferentially along the mounting hole.

[0017] Furthermore, the sealing part is provided with a tapered part that protrudes toward the mounting hole.

[0018] Furthermore, the outer peripheral wall of the valve body is provided with external threads.

[0019] Furthermore, a sealing ring is fitted on the valve body, and a radially protruding retaining edge is provided on the valve body;

[0020] When the valve body is assembled on the mounting base, the flange presses the sealing ring against the mounting base to form a seal between the valve body and the mounting base.

[0021] Furthermore, the outer wall of the cover is smoothly connected to the inner wall of the flow channel, and the front end of the cover is hemispherical.

[0022] Furthermore, the cover is screwed onto the valve body.

[0023] Furthermore, along the flow direction of the fluid within the flow channel, the inlet side of the flow channel has a narrowing section with a gradually decreasing cross-sectional area.

[0024] Furthermore, the elastic element is a spring.

[0025] Compared with the prior art, this utility model has the following advantages:

[0026] The hydraulic check valve of this utility model, by setting a cover to connect the valve body, forms a chamber between the cover and the valve body to accommodate the elastic element and the limiting part, which can confine the elastic element and the limiting part in the chamber. When the elastic element or the limiting part is damaged and broken and partially falls off, the fallen part will still be intercepted in the chamber and will not easily enter the hydraulic system and flow with the hydraulic oil, reducing the risk of oil circuit blockage and reducing the impact of the elastic element or the limiting part breaking on the hydraulic system.

[0027] Secondly, a sealing element and an adjusting element are incorporated. By changing the axial connection position between the adjusting element and the sealing element, the compression of the elastic element can be adjusted, thereby obtaining different pre-tightening forces on the valve core and changing the hydraulic pressure required to open the valve core. The adjusting element and the sealing element are connected by screws, ensuring a stable connection and facilitating adjustment to change the connection length. The adjusting element uses standard hexagonal socket head cap screws, facilitating maintenance and ensuring high interchangeability and consistency of parts. A stepped hole coaxial with the mounting hole serves to limit and guide the sliding of the sealing element, improving the sealing effect between the sealing part and the valve body.

[0028] Furthermore, designing the valve body as a tube and arranging multiple flow channels circumferentially around the mounting hole allows for more efficient use of the internal space, improving the sealing effect of the sealing part. The sealing part features a tapered section protruding towards the mounting hole; when the valve core is open, the tapered surface of this section guides the liquid flow, reducing pressure fluctuations as the liquid passes through the hydraulic check valve. External threads are provided on the valve body, allowing for direct fastening of the valve body into the threaded hole, facilitating installation and disassembly. A flange and sealing ring are incorporated into the valve body; the flange presses the sealing ring tightly against the mounting base, ensuring a tight seal between the valve body and the mounting base, resulting in a superior sealing effect.

[0029] Furthermore, the smooth transition between the outer wall of the cover and the inner wall of the flow channel, along with a hemispherical structure at the front end of the cover, effectively guides the liquid as it passes through the hydraulic check valve, reducing pressure fluctuations. The cover is connected to the valve body via bolts, facilitating easy installation and disassembly and ensuring reliable connection. A gradually decreasing diameter section in the flow channel reduces hydraulic shock, providing a buffering effect and minimizing pressure fluctuations. Springs are used as the elastic element, offering high reliability, a compact structure, and lower material costs. Attached Figure Description

[0030] The accompanying drawings, which form part of this utility model, are used to provide a further understanding of the utility model. The illustrative embodiments of the utility model and their descriptions are used to explain the utility model and do not constitute an undue limitation of the utility model. In the drawings:

[0031] Figure 1 This is a schematic diagram of the overall structure of the hydraulic check valve described in this embodiment of the utility model;

[0032] Figure 2 This is a cross-sectional schematic diagram of the hydraulic check valve in the closed state according to an embodiment of the present invention;

[0033] Figure 3 This is a cross-sectional schematic diagram of the hydraulic check valve in the open state according to an embodiment of the present invention.

[0034] Explanation of reference numerals in the attached figures:

[0035] 1. Valve body;

[0036] 101. Flow channel; 1011. Reduction section; 102. Mounting hole; 103. Stepped hole; 104. Side flange; 105. Receiving hole;

[0037] 2. Valve core;

[0038] 201. Sealing element; 2011. Sealing part; 202. Adjusting element; 2021. Limiting part;

[0039] 3. Elastic parts;

[0040] 4. Cover;

[0041] 5. Sealing ring. Detailed Implementation

[0042] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0043] In the description of this utility model, it should be noted that if terms such as "upper," "lower," "inner," or "outer" appear, indicating orientation or positional relationship, they are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, if terms such as "first" or "second" appear, they are also used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0044] Furthermore, in the description of this utility model, unless otherwise explicitly defined, the terms "installation," "connection," "joining," and "connector" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model in light of the specific circumstances.

[0045] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0046] This embodiment relates to a hydraulic check valve to reduce the risk of oil circuit blockage.

[0047] In terms of overall structure, combined Figures 1 to 3As shown, the hydraulic check valve in this embodiment includes a valve body 1, a valve core 2, an elastic element 3, and a cover 4. The valve body 1 has a flow channel 101 and a mounting hole 102 for inserting the valve core 2. The valve core 2 is slidably disposed in the mounting hole 102, and has a limiting part 2021 and a sealing part 2011. The elastic element 3 is sleeved on the valve core 2 and located between the valve body 1 and the limiting part 2021. The elastic element 3 can push against the valve core 2 to seal the outlet of the flow channel 101 with the sealing part 2011. The cover 4 is connected to the valve body 1, and the cover 4 and the valve body 1 together form a chamber that accommodates the elastic element 3 and the limiting part 2021.

[0048] As described above, the hydraulic check valve of this embodiment, by connecting the valve body 1 with a cover 4, forms a chamber between the cover 4 and the valve body 1 to accommodate the elastic element 3 and the limiting part 2021, thus confining the elastic element 3 and the limiting part 2021 within the chamber. When the elastic element 3 or the limiting part 2021 is damaged and partially detached, the detached fragments will still be intercepted in the chamber, making it difficult for them to enter the hydraulic system and flow with the hydraulic oil, reducing the risk of oil circuit blockage and minimizing the impact of the elastic element 3 or the limiting part 2021 breaking on the hydraulic system. Furthermore, by adopting the above structure, the hydraulic check valve of this embodiment is also more compact, with a shorter overall length and fewer parts, saving installation space, lowering manufacturing costs, and making assembly more convenient.

[0049] Based on the above overview, please refer to... Figures 1 to 3 As shown, specifically, when the hydraulic check valve malfunctions due to the breakage of the elastic element 3 or the limiting part 2021, the broken fragments will not enter the hydraulic system. Therefore, only the entire hydraulic check valve needs to be removed and replaced; there is no need to check for fragments entering the hydraulic system pipeline, thus shortening maintenance downtime. In this embodiment, the elastic element 3 is a spring, which has high reliability and a relatively compact structure. It occupies little space when fitted onto the valve core 2, and the material cost is also low.

[0050] Regarding the specific structure of the valve core 2, in this embodiment, the valve core 2 includes a sealing element 201 and an adjusting element 202 connected together. A sealing part 2011 is disposed on the sealing element 201, and a limiting part 2021 is disposed on the adjusting element 202. The adjusting element 202 can adjust its connection position with the sealing element 201 along its own axial direction. By setting the sealing element 201 and the adjusting element 202, the amount of compression of the elastic element 3 can be adjusted by changing the axial connection position between the adjusting element 202 and the sealing element 201, thereby obtaining different pre-tightening forces on the valve core 2 and changing the hydraulic pressure required to open the valve core 2.

[0051] The adjusting component 202 and the sealing component 201 are screwed together. This screw connection allows for easy adjustment of the connection length between the adjusting component 202 and the sealing component 201 by simply turning the adjusting component 202. The self-locking nature of the threads ensures a stable connection between the adjusting component 202 and the sealing component 201, providing good connection strength. The limiting part 2021 remains within the chamber, unaffected by the fluid in the hydraulic system, reducing the likelihood of the adjusting component 202 loosening. It is understandable that the connection between the adjusting component 202 and the sealing component 201 can also be in other forms, such as a structure with radially inserted pins on the sealing component 201 and multiple axially inserted holes on the adjusting component 202 for the pins, as long as the connection length between the adjusting component 202 and the sealing component 201 can be changed, and the distance between the sealing part 2011 and the limiting part 2021 can be adjusted.

[0052] Preferably, the adjusting component 202 uses a hex socket head cap screw, and the nut of the hex socket head cap screw forms the limiting part 2021. The hex socket head cap screw is a standard part, and using it for the adjusting component 202 facilitates maintenance, ensures high interchangeability and consistency, and allows for direct replacement of the old hex socket head cap screw with a new one of the same specification. The nut portion of the hex socket head cap screw has a hexagonal slot, allowing operators to directly adjust the screw using an Allen wrench.

[0053] Furthermore, to make the sealing element 201 slide more smoothly within the valve body 1, the valve body 1 is provided with a stepped hole 103 arranged coaxially with the mounting hole 102, allowing one end of the sealing element 201 to slide within the stepped hole 103. The stepped hole 103, arranged coaxially with the mounting hole 102, serves to limit and guide the sliding of the sealing element 201, and also makes the sealing position between the sealing part 2011 and the valve body 1 more accurate, thus improving the sealing effect between the sealing part 2011 and the valve body 1.

[0054] Regarding the specific structure of the valve body 1, in this embodiment, the valve body 1 is tubular, with the mounting hole 102 coaxially arranged with the valve body 1, and multiple flow channels 101 distributed circumferentially along the mounting hole 102. By making the valve body 1 tubular and arranging multiple flow channels 101 circumferentially along the mounting hole 102, the internal space of the valve body 1 can be fully utilized, and the sealing effect of the sealing part 2011 on the valve body 1 is also better. Specifically, in this embodiment, three flow channels 101 are evenly distributed circumferentially along the mounting hole 102 on the valve body 1, and the separating parts between adjacent flow channels 101 form a rib-like structure. This allows for a larger cross-sectional dimension and better passage of the flow channels 101, while also giving the valve body 1 higher structural strength.

[0055] In order to reduce pressure fluctuations when liquid flows through the flow channel 101, the flow channel 101 in this embodiment has a narrowing section 1011 with a gradually decreasing cross-section at the inlet side along the fluid flow direction. During the start-up and shutdown of the hydraulic system, large pressure fluctuations may occur due to the inertia of the liquid. The flow channel 101 with the narrowing section 1011 can regulate such fluctuations. The liquid entering the flow channel 101 is buffered to a certain extent, allowing the liquid to transition more smoothly, reducing hydraulic shock, and thus reducing pressure fluctuations.

[0056] Meanwhile, for the three flow channels 101 arranged circumferentially along the mounting hole 102, the sealing part 2011 of this embodiment is provided with a tapered part protruding towards the mounting hole 102. By providing the tapered part protruding towards the mounting hole 102 on the sealing part 2011, when the valve core 2 is opened, the tapered surface of the tapered part can guide the liquid and reduce the pressure fluctuation of the liquid when passing through the hydraulic check valve.

[0057] Secondly, to enhance the sealing performance of the valve body 1 after installation, a sealing ring 5 is fitted onto the valve body 1, and a radially protruding flange 104 is provided on the valve body 1. When the valve body 1 is assembled onto the mounting base, the flange 104 presses the sealing ring 5 tightly against the mounting base to form a seal between the valve body 1 and the mounting base. By providing the flange 104 and sealing ring 5 on the valve body 1, and after the valve body 1 is tightened, the flange 104 presses the sealing ring 5 tightly against the mounting base, allowing the sealing ring 5 to be compressed and sealed between the valve body 1 and the mounting base, resulting in a better sealing effect. Specifically, the sealing ring 5 is made of nitrile rubber; however, it can also be made of fluororubber or polyurethane rubber, as long as it can be compressed and sealed between the valve body 1 and the mounting base.

[0058] Furthermore, to facilitate assembly, external threads are provided on the outer peripheral wall of the valve body 1. The external threads on the outer peripheral wall of the valve body 1 allow for direct fastening of the valve body 1 into the threaded holes on the mounting base, facilitating installation and disassembly.

[0059] Regarding the specific structure of the cover 4, in this embodiment, the cover 4 is a cylindrical shape with one end open. A receiving hole 105 is provided on the valve body 1, coaxial with the mounting hole 102. The cover 4 is screwed onto the valve body 1, and its inner cavity, together with the receiving hole 105, forms a chamber for accommodating the elastic element 3 and the limiting part 2021. One end of the nut of the hexagonal socket head cap screw can enter the receiving hole 105. The cover 4 is connected to the valve body 1 by screwing, which is convenient for installation and disassembly and ensures a reliable connection. Of course, the connection between the cover 4 and the valve body 1 can also be other forms, as long as the cover 4 can be detached.

[0060] Furthermore, to reduce pressure fluctuations at the hydraulic check valve in the hydraulic system, the outer wall of the cover 4 is smoothly connected to the inner wall of the flow channel 101, and the front end of the cover 4 is hemispherical. This smooth transition between the outer wall of the cover 4 and the inner wall of the flow channel 101, along with the hemispherical structure at the front end of the cover 4, effectively guides the liquid as it passes through the hydraulic check valve, reducing pressure fluctuations. It is understood that the front end of the cover 4 could also be conical or have a spherical tip, both of which would serve to guide the liquid flow.

[0061] The hydraulic check valve of this embodiment can confine the elastic element 3 and the limiting part 2021 within the chamber. When the elastic element 3 or the limiting part 2021 is damaged and partially detached, fragments are less likely to enter the hydraulic system and flow with the hydraulic oil, reducing the risk of oil circuit blockage and minimizing the impact of the elastic element 3 or the limiting part 2021 breaking on the hydraulic system. Furthermore, the hydraulic check valve of this embodiment has a relatively compact structure, shorter overall length, and fewer parts, saving installation space and reducing manufacturing costs.

[0062] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A hydraulic check valve, characterized in that: It includes a valve body (1), a valve core (2), an elastic element (3), and a cover (4); The valve body (1) has a flow channel (101) and a mounting hole (102) for inserting the valve core (2) is provided on the valve body (1); The valve core (2) is slidably disposed in the mounting hole (102), and the valve core (2) is provided with a limiting part (2021) and a sealing part (2011); The elastic element (3) is sleeved on the valve core (2) and located between the valve body (1) and the limiting part (2021), and the elastic element (3) can push against the valve core (2) so that the sealing part (2011) seals the outlet of the flow channel (101); The cover (4) is connected to the valve body (1), and the cover (4) and the valve body (1) together form a chamber that accommodates the elastic element (3) and the limiting part (2021).

2. The hydraulic check valve according to claim 1, characterized in that: The valve core (2) includes a seal (201) and an adjusting element (202) connected together; The sealing part (2011) is disposed on the sealing member (201), the limiting part (2021) is disposed on the adjusting member (202), and the adjusting member (202) can adjust the connection position between itself and the sealing member (201) along its own axial direction.

3. The hydraulic check valve according to claim 2, characterized in that: The adjusting member (202) and the sealing member (201) are screwed together.

4. The hydraulic check valve according to claim 3, characterized in that: The adjusting component (202) is made of hexagon socket head cap screw, and the nut of the hexagon socket head cap screw constitutes the limiting part (2021).

5. The hydraulic check valve according to claim 2, characterized in that: The valve body (1) is provided with a stepped hole (103) arranged coaxially with the mounting hole (102), and one end of the sealing member (201) can slide in the stepped hole (103).

6. The hydraulic check valve according to claim 1, characterized in that: The valve body (1) is tubular, the mounting hole (102) is coaxially arranged with the valve body (1), and the flow channel (101) is a plurality of channels distributed circumferentially along the mounting hole (102).

7. The hydraulic check valve according to claim 6, characterized in that: The sealing part (2011) is provided with a tapered portion protruding toward the mounting hole (102); and / or, The valve body (1) has external threads on its outer peripheral wall.

8. The hydraulic check valve according to claim 6, characterized in that: A sealing ring (5) is fitted on the valve body (1), and a radially protruding retaining edge (104) is provided on the valve body (1); When the valve body (1) is assembled on the mounting base, the flange (104) presses the sealing ring (5) onto the mounting base to form a seal between the valve body (1) and the mounting base.

9. The hydraulic check valve according to claim 1, characterized in that: The outer wall of the cover (4) is smoothly connected to the inner wall of the flow channel (101), and the front end of the cover (4) is hemispherical; and / or, The cover (4) is screwed onto the valve body (1).

10. The hydraulic check valve according to any one of claims 1 to 9, characterized in that: Along the flow direction of the fluid within the flow channel, the inlet side of the flow channel (101) has a narrowing section (1011) with a gradually decreasing flow cross-section; and / or, The elastic element (3) is a spring.

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