Anti-vibration backflow one-way valve

Abstract

The utility model discloses a one-way valve capable of preventing vibration backflow, which comprises a valve sleeve (1), an annular groove (2) arranged at an inner hole of the valve sleeve (1), a valve core (3) arranged in the valve sleeve (1) and corresponding to the axial position of the annular groove (2), a flow channel arranged on the valve core (3) and communicated with the annular groove (2) and the rear space of the valve core (3), a spiral spring (4) arranged on the rear side of the valve core (3) and connected with the valve sleeve (1). A valve seat (5) is arranged on the front side of the valve element (3), a first through hole (6) is formed in the valve seat (5) in the axial direction, the front side of the valve element (3) makes contact with the conical surface of the valve seat (5) to form a first sealing part (7), an annular second sealing part (8) is formed between the valve element (3) and the valve sleeve (1), and the second sealing part (8) is located on the front side of the annular groove (2). The hydraulic cylinder has the advantages of being low in opening pressure and capable of effectively preventing oil liquid from flowing back in a vibration environment.

Description

Technical Field

[0001] This utility model belongs to the field of check valves, and particularly relates to a vibration-resistant backflow-proof check valve used in hydraulic systems. Background Technology

[0002] A check valve is a commonly used and extremely important hydraulic component in a hydraulic system. Its main function is to ensure that fluid flows in only one direction and cannot flow backward. At the same time, it is required to have very low resistance in the flow direction, excellent sealing performance in the reverse direction, and to operate sensitively without vibration.

[0003] Currently, low opening pressure (e.g., ≤0.05MPa) and oil backflow during operation in vibrating environments are challenges in check valve design. This is primarily because, under low opening pressure conditions, the spring force within the check valve needs to be designed to be extremely small to meet the low-pressure opening requirements. Additionally, depending on the operating environment, such as when installed on an engine block, the check valve vibrates with the engine. This vibration causes slight deformation or twisting of the spring, leading to a loss of spring preload. Simultaneously, the valve core briefly disengages from the valve seat along the axis during vibration, opening the seal and causing oil backflow. Oil backflow through the check valve increases engine fuel consumption, noise, and internal oil pressure in certain system cavities. In severe cases, it can affect engine or hydraulic system performance or even cause malfunction.

[0004] Therefore, a check valve with low opening pressure and effective protection against oil backflow in vibrating environments is needed. Utility Model Content

[0005] The purpose of this invention is to provide a one-way valve that prevents vibration and backflow. This invention has the advantages of low opening pressure and effective prevention of oil backflow in vibrating environments.

[0006] The technical solution of this utility model is as follows: A one-way valve for vibration prevention and backflow prevention includes a valve sleeve, an annular groove in the inner hole of the valve sleeve, a valve core corresponding to the axial position of the annular groove inside the valve sleeve, a flow channel on the valve core, the flow channel connecting the annular groove and the rear space of the valve core, a spring connected to the valve sleeve on the rear side of the valve core, the spring being helical, a valve seat on the front side of the valve core, a first through hole in the axial direction of the valve seat, the front side of the valve core contacting the conical surface of the valve seat to form a first sealing part, a second annular sealing part being formed between the valve core and the valve sleeve, the second sealing part being located on the front side of the annular groove, and the axial length of the second sealing part being 0.2 mm or more.

[0007] In the aforementioned anti-vibration backflow check valve, the length of the second sealing part is 0.5-1mm, and the fitting clearance between the valve core and the valve sleeve at the second sealing part is 0.007-0.01mm.

[0008] In the aforementioned anti-vibration backflow check valve, a bushing is provided on the rear side of the spring, and the spring is connected to the valve sleeve through the bushing. A second through hole is provided in the axial direction of the bushing.

[0009] In the aforementioned anti-vibration backflow check valve, a pipe joint is provided on the front side of the valve sleeve, and a sealing ring is provided between the pipe joint and the valve sleeve.

[0010] In the aforementioned anti-vibration backflow check valve, the valve seat is fixed between the valve sleeve and the pipe joint, and a filter screen covering the first through hole is provided on the front side of the valve seat.

[0011] In the aforementioned anti-vibration backflow check valve, the filter screen is conical, with the middle part of the filter screen facing the pipe joint.

[0012] In the aforementioned anti-vibration backflow check valve, a blind hole is provided on the rear end face of the valve core, and multiple oil holes with connecting annular grooves are provided on the side wall of the blind hole. The blind hole and multiple oil holes form an oil passage.

[0013] Compared with existing technologies, this invention has two sealing parts in the axial direction. When the one-way valve operates in a vibrating environment, even if the spring has slight deformation or twisting and the valve core experiences slight axial movement, causing one sealing part to open briefly, the other sealing part will not open, maintaining a dynamic sealing state and preventing oil backflow. Therefore, this invention has the advantages of lower opening pressure and effective prevention of oil backflow in vibrating environments.

[0014] In addition, by installing a filter screen on the front side of the valve core to intercept impurities in the oil, the sealing part is prevented from being damaged by impurities, thus extending the service life of the one-way valve and improving the safety of the engine or hydraulic system. Attached Figure Description

[0015] Figure 1 This is a front view schematic diagram of this utility model.

[0016] The markings in the attached diagram are as follows: 1-valve sleeve, 2-ring groove, 3-valve core, 4-spring, 5-valve seat, 6-first through hole, 7-first sealing part, 8-second sealing part, 9-shield, 10-second through hole, 11-pipe joint, 12-sealing ring, 13-filter screen, 14-blind hole, 15-oil hole. Detailed Implementation

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments, but this should not be construed as limiting the present invention.

[0018] Example: A vibration-resistant backflow prevention check valve, such as... Figure 1 As shown, in Figure 1In the middle, the right side is the front side, including valve sleeve 1. The inner hole of valve sleeve 1 is provided with an annular groove 2. Valve sleeve 1 is provided with valve core 3 corresponding to the axial position of annular groove 2. A blind hole 14 is provided on the rear end face of valve core 3. Four oil holes 15 are provided on the side wall of blind hole 14, which are evenly distributed in the circumference and all connected to annular groove 2. Blind hole 14 and four oil holes 15 form an oil passage, so that annular groove 2 is connected to the rear port of valve sleeve 1.

[0019] The valve core 3 is provided with a bushing 9 for connecting the valve sleeve 1 on the rear side. The bushing 9 is provided with a second through hole 10 in the axial direction. A spiral spring 4 is provided between the bushing 9 and the valve core 3. The front end of the spring 4 enters the blind hole 14.

[0020] A valve seat 5 is provided on the front side of the valve core 3. The valve seat 5 has a first through hole 6 in the axial direction. The front side of the valve core 3 contacts the conical surface of the valve seat 5, forming a first sealing part 7 at the contact position.

[0021] A second annular sealing part 8 is formed between the valve core 3 and the valve sleeve 1. The second sealing part 8 is located on the front side of the annular groove 2, and its axial length is 0.5-1mm. By grinding the corresponding positions of the valve sleeve 1 and the valve core 3, the fitting clearance between the valve core 3 and the valve sleeve 1 at the second sealing part 8 is made to be 0.007-0.01mm, forming a dynamic seal. The fitting relationship between the valve core 3 and the valve sleeve 1 at other positions can use a larger clearance to reduce the movement resistance of the valve core 3 and improve the response speed of the check valve.

[0022] The valve sleeve 1 has a pipe connector 11 on its front side, and an O-ring seal 12 between the pipe connector 11 and the valve sleeve 1. The valve seat 5 is fixed between the valve sleeve 1 and the pipe connector 11. The front side of the valve seat 5 has a filter screen 13 covering the first through hole 6. The filter screen 13 is conical, which increases the filtration area of ​​the filter screen 13, helps to keep the oil flowing smoothly, and reduces the oil flow resistance. The middle part of the filter screen 13 faces the pipe connector 11. In comparative tests, it was found that the effect of the filter screen 13 facing the pipe connector 11 is better than that of the filter screen 13 facing the valve seat 5.

[0023] Working principle: Low-pressure oil enters the check valve through pipe joint 11, passes through filter screen 13 to filter impurities, and then enters valve seat 5. The oil acts on valve core 3, causing valve core 3 to move backward. The first sealing part 7 is opened first, until the valve core 3 moves a distance greater than the axial length of the second sealing part 8, i.e., 0.5-1mm. Then the second sealing part 8 is also opened, and the oil flows from the outer front end of valve core 3 into the annular groove 2, then through oil hole 15 into blind hole 14, and finally flows out from the rear end of valve sleeve 1.

[0024] When the check valve is operating in a vibrating working environment, even if the spring 4 may be slightly deformed or twisted and the valve core 3 has a slight axial movement that causes the first sealing part 7 to open briefly, the second sealing part 8 will not open because it has a certain axial length, and the oil will not flow back.

[0025] The low spring force of the spring 4 ensures that the opening pressure of the check valve is ≤0.05MPa. For example, when the opening pressure of the check valve is 0.05MPa and the oil pressure at the front end is ≥0.05MPa, the spring 4 should be able to be compressed and deformed to a certain extent to open the check valve.

[0026] In the description of the embodiments, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the embodiments 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.

Claims

1. A vibration-resistant backflow-proof check valve, characterized in that: The valve includes a valve sleeve (1), an annular groove (2) is provided in the inner hole of the valve sleeve (1), a valve core (3) is provided in the valve sleeve (1) corresponding to the axial position of the annular groove (2), a flow channel is provided on the valve core (3), the flow channel connects the annular groove (2) and the rear space of the valve core (3), a spring (4) is provided on the rear side of the valve core (3) to connect the valve sleeve (1), the spring (4) is helical, a valve seat (5) is provided on the front side of the valve core (3), a first through hole (6) is provided on the axial direction of the valve seat (5), the front side of the valve core (3) contacts the conical surface of the valve seat (5) to form a first sealing part (7), a second annular sealing part (8) is formed between the valve core (3) and the valve sleeve (1), the second sealing part (8) is located on the front side of the annular groove (2), and the axial length of the second sealing part (8) is more than 0.2 mm.

2. The anti-vibration backflow check valve according to claim 1, characterized in that: The length of the second sealing part (8) is 0.5-1mm, and the fitting clearance between the valve core (3) and the valve sleeve (1) at the second sealing part (8) is 0.007-0.01mm.

3. The anti-vibration backflow check valve according to claim 1, characterized in that: The spring (4) has a bushing (9) on its rear side. The spring (4) is connected to the valve sleeve (1) through the bushing (9). The bushing (9) has a second through hole (10) in the axial direction.

4. The anti-vibration backflow check valve according to claim 1, characterized in that: The valve sleeve (1) is provided with a pipe joint (11) on the front side, and a sealing ring (12) is provided between the pipe joint (11) and the valve sleeve (1).

5. The anti-vibration backflow check valve according to claim 4, characterized in that: The valve seat (5) is fixed between the valve sleeve (1) and the pipe joint (11), and a filter screen (13) covering the first through hole (6) is provided on the front side of the valve seat (5).

6. The anti-vibration backflow check valve according to claim 5, characterized in that: The filter screen (13) is conical, with the middle part of the filter screen (13) facing the pipe joint (11).

7. The anti-vibration backflow check valve according to claim 1, characterized in that: The valve core (3) has a blind hole (14) on its rear end face. The side wall of the blind hole (14) has multiple oil holes (15) that connect to the annular groove. The blind hole (14) and the multiple oil holes (15) together form an oil passage.

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