A one-way valve for a hydraulic station

Abstract

The utility model discloses a one -way valve for hydraulic station, including valve body, valve core, sealing ring, reset spring, spring gland and C type clasp spring, and the valve core is located in the valve body, and the valve core includes plugging piece, connecting section and positioning section, is equipped with the valve seat in the valve body, is equipped with the flow -through mouth on the valve seat, and plugging piece sets up correspondingly the flow -through mouth, and plugging piece is equipped with annular sealing groove, and sealing ring is nested in annular sealing groove, and reset spring one end and positioning section abut, and spring gland sets up in reset spring other end, and C type clasp spring sets up in spring gland one side, and the valve body inner wall is equipped with a plurality of clamping grooves at equal intervals, and C type clasp spring is clamped into the clamping groove and abuts with spring gland. The utility model discloses through the sealing ring of adding, promotes the sealing effect, through the positioning section on the valve body inner wall sliding, plays the guiding effect, guarantees the valve core return motion stable, prolongs the life, through C type clasp spring clamping into the different position clamping groove adjustment reset spring precompression, thereby changes make the minimum fluid pressure required for the valve core opening.

Description

Technical Field

[0001] This utility model relates to the field of valve control technology, specifically to a check valve for a hydraulic station. Background Technology

[0002] As the power core of a hydraulic system, the stable operation of the hydraulic power unit directly determines the reliability of the entire machine. The check valve, as the most basic and core directional control element in the hydraulic power unit's oil circuit, has the core function of enabling unidirectional fluid flow and reverse cutoff, preventing oil backflow that could lead to system pressure loss, malfunction of actuators, or damage to the hydraulic pump due to dry running. It is a crucial barrier ensuring stable pressure and efficient energy transmission in the hydraulic system.

[0003] Traditional check valves rely on a hard metal seal between the valve core and the valve seat. Under low-pressure conditions, the sealing contact stress may be insufficient, easily leading to micro-leakage. At the same time, the valve core is prone to poor guidance and misalignment during repeated opening and closing movements, causing uneven wear on the sealing surface. This not only affects the sealing effect but also significantly shortens the valve's service life. Summary of the Invention

[0004] The main objective of this invention is to overcome the defects of the prior art and provide a high-efficiency leak-proof check valve for hydraulic stations.

[0005] To achieve the above objectives, this utility model proposes a one-way valve for a hydraulic station, comprising a valve body, a valve core, a sealing ring, a return spring, a spring cover, and a C-shaped retaining ring. The valve core is disposed within the valve body and includes a sealing element, a connecting section, and a positioning section coaxially connected in sequence. A valve seat is provided within the valve body, and a flow port is provided on the valve seat. The sealing element is disposed corresponding to the flow port and has an annular sealing groove. The sealing ring is nested within the annular sealing groove. One end of the return spring abuts against the positioning section, and the spring cover is disposed at the other end of the return spring. The C-shaped retaining ring is disposed on the side of the spring cover away from the return spring. A plurality of slots are provided at equal intervals on the inner wall of the valve body, and the C-shaped retaining ring is inserted into the slots and abuts against the spring cover.

[0006] To further optimize the technical solution, the sealing component includes an oil-blocking end and a sealing end, which are integrally formed. The outer diameter of the oil-blocking end corresponds to the inner diameter of the flow port, and the outer diameter of the sealing end is larger than the inner diameter of the flow port and smaller than the inner diameter of the valve body, so that a sealing surface is formed between the end face of the sealing end and the end face of the flow port. The length of the oil-blocking end is set to 8-13mm, and the diameter is set to 15-17mm.

[0007] To further optimize the technical solution, the end of the oil-blocking end is designed with a chamfered structure.

[0008] The technical solution is further optimized so that the angle of the chamfered structure is 30°-45°.

[0009] To further optimize the technical solution, the inlet end of the flow port is set as a flared opening.

[0010] To further optimize the technical solution, the annular sealing groove is located at the connection between the oil-blocking end and the sealing end, and the groove depth of the annular sealing groove is set to 2-3mm.

[0011] To further optimize the technical solution, the connecting section is connected between the sealing end and the positioning section. The outer diameter of the connecting section is the same as the outer diameter of the sealing end, and the outer diameter of the positioning section corresponds to the inner diameter of the valve body. Both the connecting section and the positioning section are hollow structures that are interconnected. The surface of the connecting section has several through holes that connect to the internal hollow structure. The inner wall of the positioning section has a first annular stepped surface, and one end of the return spring abuts against the first annular stepped surface.

[0012] To further optimize the technical solution, a second annular stepped surface is provided on the inner wall of the inlet end of the valve body, and a filter is provided at the second annular stepped surface.

[0013] To further optimize the technical solution, the filter includes a support frame and a conical filter screen, with the conical filter screen fitted onto the support frame.

[0014] To further optimize the technical solution, the support frame includes a support ring and support ribs. The bottom ends of the support ribs are evenly spaced and fixed around the support ring, and the top ends of the support ribs are fixed together to form a cone structure. The cone-shaped filter screen covers and fits over the support ribs.

[0015] The beneficial effects of this utility model include: when fluid flows forward from the fluid inlet end of the valve body, the pressure pushes the sealing component to compress the return spring, opening the flow port; when the fluid flows in the reverse direction, the return spring rebounds and pushes the sealing component to press the flow port, achieving sealing; when the sealing component presses against the flow port at the valve seat, the sealing ring is squeezed between the sealing component and the valve seat, filling the tiny gap between their contact surfaces and forming an elastic seal—compared to the traditional one-way valve metal hard contact seal, the sealing ring can significantly improve the sealing effect, effectively preventing fluid leakage even under low-pressure conditions, and improving the working efficiency of the one-way valve; the positioning section can slide on the inner wall of the valve body, playing a certain guiding role, ensuring smooth valve core return movement, and extending service life; by adjusting the C-type snap ring to be inserted into different slots, the pre-compression of the return spring can be adjusted, thereby changing the minimum fluid pressure required to open the valve core, allowing the one-way valve to be calibrated to the specific opening pressure required by the hydraulic station without replacing the return spring, effectively improving applicability. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the interior of the valve body of the one-way valve in this embodiment of the present invention after being cut open.

[0017] Figure 2 This is an overall schematic diagram of the one-way valve in an embodiment of this utility model.

[0018] Figure 3 This is a schematic diagram showing the connection between the valve core, the reset spring, the spring cover, and the C-shaped retaining ring in an embodiment of this utility model.

[0019] Figure 4 This is a schematic diagram of the filter in an embodiment of this utility model.

[0020] Reference numerals: 1 Valve body; 101 Valve seat; 102 Flow port; 103 Slot; 104 Bell mouth; 105 Second annular stepped surface; 2 Valve core; 201 Sealing component; 202 Connecting section; 203 Positioning section; 204 Annular sealing groove; 205 Oil blocking end; 206 Sealing end; 207 Sealing surface; 208 Chamfered structure; 209 Through hole; 210 First annular stepped surface; 3 Sealing ring; 4 Return spring; 5 Spring cover; 6 C-type snap ring; 7 Filter; 701 Support frame; 702 Conical filter screen; 703 Support ring; 704 Support rib. Detailed Implementation

[0021] To make the technical problems, technical solutions, and beneficial effects of the embodiments of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0022] It should be noted that when a component is referred to as "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as "connected to" another component, it can be directly connected to or indirectly connected to that other component. Furthermore, a connection can be for both fixing and circuit connection purposes.

[0023] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of 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. Therefore, they should not be construed as limitations on this utility model.

[0024] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of embodiments of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0025] Please see Figures 1 to 4One embodiment discloses a one-way valve for a hydraulic station, comprising a valve body 1, a valve core 2, a sealing ring 3, a return spring 4, a spring cap 5, and a C-type snap ring 6. The valve body 1 has a tubular structure and serves as the fluid flow carrier, providing installation space for all internal components. The valve core 2 is located within the valve body 1 and includes a sealing element 201, a connecting section 202, and a positioning section 203 coaxially connected in sequence. A valve seat 101 is provided within the valve body 1, and a flow port 102 is provided on the valve seat 101. The flow port 102 is the core flow channel for the fluid. The sealing component 201 is provided corresponding to the flow port 102 and is used to block or open the flow port 102. An annular sealing groove 204 is provided on the sealing component 201, and the sealing ring 3 is nested in the annular sealing groove 204. One end of the return spring 4 abuts against the positioning section 203, and the spring cover 5 is provided at the other end of the return spring 4. The C-type snap ring 6 is provided on the side of the spring cover 5 away from the return spring 4. Several slots 103 are provided at equal intervals along the length of the valve body 1 on the inner wall of the valve body 1. The C-type snap ring 6 is inserted into the slot 103 and abuts against the spring cover 5. Specifically, the valve body 1 is made of stainless steel. The left end of the valve body 1 is the fluid inlet end, and the right end is the fluid outlet end, allowing fluid to flow from the fluid inlet end to the fluid outlet end and preventing backflow. The sealing ring 3 is an oil-resistant rubber O-ring, which is embedded in the annular sealing groove 204 to ensure that the sealing ring 3 and the annular sealing groove 204 fit tightly without loosening. The spring cover 5 is a convex ring structure, and the convex part of the convex ring is embedded in one end of the return spring 4 to ensure that the axis of the return spring 4 is always consistent with the movement axis of the valve core 2 during the entire process of compression and extension, effectively preventing the return spring 4 from bending or lateral slippage when under force. In this invention, when fluid flows forward from the fluid inlet of valve body 1, pressure pushes the sealing element 201 to compress the return spring 4, opening the flow port 102; when fluid flows in the reverse direction, the return spring 4 rebounds, pushing the sealing element 201 to press the flow port 102, achieving sealing; when the sealing element 201 presses against the flow port 102 at valve seat 101, the sealing ring 3 is squeezed between the sealing element 201 and valve seat 101, filling the tiny gap between their contact surfaces and forming an elastic seal—compared to hard metal contact, the sealing ring 3 can significantly improve... The sealing effect is enhanced, effectively preventing fluid leakage even under low-pressure conditions, achieving efficient leak prevention; the positioning section 203 can slide on the inner wall of the valve body 1, playing a certain guiding role, ensuring smooth return movement of the valve core 2, and extending service life; by adjusting the C-type snap ring 6 to be inserted into different positions of the snap ring 103, the pre-compression of the return spring 4 can be adjusted, thereby changing the minimum fluid pressure required to open the valve core 2. The check valve can be calibrated to the specific opening pressure required by the hydraulic station without replacing the return spring 4, effectively improving applicability.

[0026] In a specific example, the sealing component 201 includes an oil-blocking end 205 and a sealing end 206, which are integrally formed. The outer diameter of the oil-blocking end 205 corresponds to the inner diameter of the flow port 102, and the outer diameter of the sealing end 206 is larger than the inner diameter of the flow port 102 and smaller than the inner diameter of the valve body 1, so that a sealing surface 207 is formed between the end face of the sealing end 206 and the end face of the flow port 102, and the sealing ring 3 can be tightly pressed on this plane to achieve effective sealing. The length of the oil-blocking end 205 is set to 8-13mm, for example, 8mm, 10mm, 13mm, preferably 13mm, and the diameter of the oil-blocking end 205 is set to 15-17mm, for example, 15mm, 16mm, 17mm, preferably 17mm. The specific length is adjusted according to the installation space in the valve body 1. The annular sealing groove 204 is provided at the connection between the oil-blocking end 205 and the sealing end 206, and the groove depth of the annular sealing groove 204 is set to 2-3mm. When the valve core 3 returns to its original position, the oil-blocking end 205 can be inserted into the flow port 102, further providing good guidance for the valve core 2, effectively preventing the valve core 2 from tilting and wearing unevenly. At the same time, the oil-blocking end 205 provides more sufficient return space, preventing jamming caused by insufficient length of the oil-blocking end 205, ensuring accurate opening and closing actions, improving sealing effect, reducing internal losses of the hydraulic station, reducing energy waste caused by oil leakage, effectively improving the energy-saving effect of the hydraulic station, and reducing the operating energy consumption cost of the hydraulic station.

[0027] In a preferred embodiment, the end of the plugging end 205 is provided with a chamfered structure 208. Specifically, the angle of the chamfered structure 208 is 30°-45°, for example, 30°, 40°, or 45°, preferably 45°. The chamfered surface is smooth and burr-free. The large angle of the chamfered structure 208 can reduce the resistance to oil backflow, making it easier for the oil to flow along the inclined surface of the plugging end 205, assisting the valve core 2 to return smoothly and avoiding abnormal opening and closing caused by valve core 2 jamming. After testing, with the length of the plugging end 205 set to 13mm, the angle of the chamfered structure 208 set to 45°, and the sealing ring 3 fitted on the sealing part 201 to fit the end face of the flow port 102 for sealing design, the return speed of the valve core 2 is shortened by more than 30%, the oil leakage is reduced to less than 0.1mL / h, and the energy consumption (operating power) of the hydraulic station is reduced by 8%-12%, confirming that all performance indicators meet the design requirements.

[0028] In a preferred embodiment, the inlet end of the flow port 102 is configured as a flared port 104. That is, the inner diameter gradually decreases along the direction of fluid flow until it is the same as the inner diameter of the flow port 102. The flared port 104 structure provides a smooth transition channel for the fluid, effectively avoiding turbulence and eddies that are easily generated at right-angle or acute-angle inlets, allowing the fluid to enter the flow port 102 more smoothly, significantly reducing local pressure loss, thereby reducing the overall pressure drop of the check valve.

[0029] In a specific example, the connecting section 202 is connected between the sealing end 206 and the positioning section 203. The outer diameter of the connecting section 202 is the same as the outer diameter of the sealing end 206 and smaller than the inner diameter of the valve body 1. The outer diameter of the positioning section 203 corresponds to the inner diameter of the valve body 1, so that the valve core 2 can slide along the inner wall of the valve body 1. The connecting section 202 and the positioning section 203 are both hollow structures that are interconnected, and the hollow structures are connected to the inner cavity of the valve body 1. The surface of the connecting section 202 is provided with several through holes 209 that connect to the internal hollow structure. The inner wall of the positioning section 203 is provided with a first annular stepped surface 210, and one end of the return spring 4 abuts against the first annular stepped surface 210. When the check valve is opened, fluid enters the cavity between the connecting section 202, the sealing end 206 and the inner wall of the valve body 1 from the flow port 102, and enters the interior of the connecting section 202 and the positioning section 203 along the through hole 209, and flows out from the fluid outlet end of the valve body 1; the positioning section 203 serves as a guide part for the valve core 2 to slide in the valve body 1, and its outer diameter matches the inner diameter of the valve body 2 to ensure that the valve core 2 can always move smoothly along the axis, ensure precise centering when closed, effectively press the sealing surface 207, achieve reliable sealing, and prevent uneven wear. The first annular stepped surface 210 provides a flat and stable mounting surface for the return spring 4, enabling the return spring 4 to be evenly transmitted to the valve core 2 along the axial direction, ensuring that its reset action is direct and accurate. One end of the return spring 4 extends into the positioning section 203 and presses on the first annular stepped surface 210. The first annular stepped surface 210 provides a flat and stable mounting surface for the return spring 4, enabling the spring force of the return spring 4 to be strictly and evenly transmitted to the valve core 2 along the axial direction, avoiding twisting due to uneven mounting surface, generating lateral component force, and affecting the smoothness of valve core 2 movement and sealing effect.

[0030] In a preferred embodiment, a second annular stepped surface 105 is provided on the inner wall of the inlet end of the valve body 1. A filter 7 is provided at the second annular stepped surface 105. The filter 7 includes a support frame 701 and a conical filter screen 702. The conical filter screen 702 has a mesh size of 100-480 meshes / square centimeter and is fitted onto the support frame 701. The support frame 701 includes a support ring 703 and support ribs 704. The bottom ends of the support ribs 704 are evenly spaced and fixed around the support ring 703, and the top ends of the support ribs 704 are fixed together to form a conical structure. The 702 cover is fitted onto the support rib 704. The cone apex of the cone-shaped filter screen 702 and the support frame 701 faces the inlet end of the valve body 1, that is, the cone tip faces upstream. The fluid flows in from the cone tip and diffuses along the cone surface, providing a larger effective filtration area within the limited installation space. This allows impurities in the hydraulic station oil circuit to be intercepted and distributed on the entire cone-shaped side of the filter screen, making it less prone to clogging. It protects the smooth sealing surface of the valve core 2 and valve seat 101 and ensures the flexible operation of moving parts such as the return spring 4. It can effectively prevent problems such as poor sealing, valve core 2 jamming, abnormal operation, or accelerated wear caused by impurities.

[0031] The above description, in conjunction with specific / preferred embodiments, provides a further detailed explanation of the present invention and should not be construed as limiting the specific implementation of the present invention to these descriptions. For those skilled in the art, various substitutions or modifications can be made to these described embodiments without departing from the concept of the present invention, and all such substitutions or modifications should be considered within the protection scope of the present invention. In the description of this specification, the reference to terms such as "an embodiment," "some embodiments," "preferred embodiment," "example," "specific example," or "some examples," etc., indicates that the specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the described specific features, structures, materials, or characteristics can be combined in a suitable manner in any one or more embodiments or examples. Without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification and the features of different embodiments or examples. Although embodiments of the present invention and their advantages have been described in detail, it should be understood that various changes, substitutions and alterations may be made herein without departing from the scope of protection of the patent application.

Claims

1. A check valve for a hydraulic power unit, characterized in that: The valve includes a valve body, a valve core, a sealing ring, a return spring, a spring cover, and a C-shaped retaining ring. The valve core is located within the valve body and includes a sealing element, a connecting section, and a positioning section coaxially connected in sequence. A valve seat is provided within the valve body, and the valve seat has a flow port. The sealing element is positioned corresponding to the flow port and has an annular sealing groove. The sealing ring is nested within the annular sealing groove. One end of the return spring abuts against the positioning section, and the spring cover is located at the other end of the return spring. The C-shaped retaining ring is located on the side of the spring cover away from the return spring. The inner wall of the valve body has several equally spaced slots, and the C-shaped retaining ring is inserted into the slots and abuts against the spring cover.

2. The one-way valve as described in claim 1, characterized in that: The sealing component includes an oil-blocking end and a sealing end, which are integrally formed. The outer diameter of the oil-blocking end corresponds to the inner diameter of the flow port. The outer diameter of the sealing end is larger than the inner diameter of the flow port and smaller than the inner diameter of the valve body, so that a sealing surface is formed between the end face of the sealing end and the end face of the flow port. The length of the oil-blocking end is set to 8-13mm, and the diameter is set to 15-17mm.

3. The one-way valve as described in claim 2, characterized in that: The end of the oil-blocking end is designed with a chamfered structure.

4. The one-way valve as described in claim 3, characterized in that: The angle of the chamfered structure is 30°-45°.

5. The one-way valve as described in claim 4, characterized in that: The inlet end of the flow port is designed as a flared opening.

6. The one-way valve as described in claim 5, characterized in that: The annular sealing groove is located at the connection between the oil-blocking end and the sealing end, and the groove depth of the annular sealing groove is set to 2-3mm.

7. The one-way valve as described in claim 6, characterized in that: The connecting section connects the sealing end and the positioning section. The outer diameter of the connecting section is the same as the outer diameter of the sealing end. The outer diameter of the positioning section corresponds to the inner diameter of the valve body. The connecting section and the positioning section are both hollow structures that are interconnected. The surface of the connecting section has several through holes that connect to the internal hollow structure. The inner wall of the positioning section has a first annular stepped surface. One end of the return spring abuts against the first annular stepped surface.

8. The one-way valve as described in any one of claims 1 to 7, characterized in that: The valve body has a second annular stepped surface on the inner wall of the inlet end, and a filter is provided at the second annular stepped surface.

9. The one-way valve as described in claim 8, characterized in that: The filter includes a support frame and a conical filter screen, the conical filter screen being fitted onto the support frame.

10. The one-way valve as described in claim 9, characterized in that: The support frame includes a support ring and support ribs. The bottom ends of the support ribs are evenly spaced and fixed around the support ring. The top ends of the support ribs are fixed together to form a cone structure. The cone-shaped filter screen covers and is fitted onto the support ribs.

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