Overflow valve and hydraulic tool

Abstract

The utility model relates to an overflow valve and a hydraulic tool. The overflow valve comprises a valve body, a plunger, an elastic piece and a steel ball. An overflow cavity, an oil inlet hole and an oil outlet hole are formed in the valve body, the plunger is movably installed on the valve body, the first end of the plunger is located outside the valve body, the second end of the plunger extends into the overflow cavity of the valve body, a plunger boss is formed on the plunger in the radial direction, and the oil outlet hole is formed in the side, close to the oil inlet hole, of the plunger boss; the elastic piece is connected between the plunger boss and the valve body in an abutting mode. The steel ball abuts against the second end of the plunger. During pressure maintaining, the plunger enables the steel ball to abut against a port of the oil inlet hole under the action of the elastic piece. And during pressure relief, the high-pressure oil overcomes the acting force of the elastic piece to push the steel ball away from the port of the oil inlet hole. The overflow valve can improve the oil discharge speed, so that the actual working efficiency of a hydraulic tool is improved.

Description

Technical Field

[0001] This application relates to the field of hydraulic tool technology, and in particular to an overflow valve and a hydraulic tool. Background Technology

[0002] In existing hydraulic tools, the relief valve uses high-pressure oil generated by the retraction of a cylinder spring to open the valve core, thus connecting the cylinder, relief valve, and oil tank to complete the oil unloading process. However, this type of relief valve requires the valve core to be pushed open a certain distance to unload the oil, resulting in a slow unloading speed. Users often desire rapid oil unloading, but existing tools suffer from slow speeds and unstable fluid flow rates, leading to low actual work efficiency. Utility Model Content

[0003] In view of the shortcomings of the prior art, the purpose of this application is to provide an overflow valve and a hydraulic tool, which can improve the oil unloading speed and thus improve the actual working efficiency of the hydraulic tool.

[0004] The technical solution to the existing technical problem can be adopted by the following:

[0005] In a first aspect, this application provides an overflow valve, including a valve body, a plunger, and an elastic element. The valve body forms an overflow cavity and an oil inlet and an oil outlet communicating with the overflow cavity; the plunger is movably mounted on the valve body, with a first end outside the valve body and a second end extending into the overflow cavity of the valve body; the plunger has a radially formed plunger boss, and the oil outlet is located on the side of the plunger boss near the oil inlet; the elastic element abuts against the plunger boss and the valve body; a steel ball abuts against the second end of the plunger; during pressure holding, the plunger, under the action of the elastic element, presses the steel ball against the port of the oil inlet; during pressure release, high-pressure oil overcomes the force of the elastic element and pushes the steel ball away from the port of the oil inlet.

[0006] Optionally, in the oil inlet direction, the lowest point of the port formed by the oil outlet on the valve body is flush with the highest point of the port formed by the oil inlet on the valve body.

[0007] Optionally, in the oil inlet direction, the port formed on the valve body by the oil outlet hole at least partially coincides with the port formed on the valve body by the oil inlet hole.

[0008] Optionally, the elastic element is a spring, which is sleeved on the outer periphery of the plunger.

[0009] Optionally, the valve body and the plunger are fitted together to form a mounting groove with the opening facing the elastic element. A sealing ring is provided in the mounting groove to seal the valve body and the plunger. A gasket is provided on the side of the sealing ring near the elastic element. The gasket is sleeved on the plunger, and the elastic element abuts against the gasket.

[0010] Optionally, one end of the valve body has a mounting port. The overflow valve also includes a pressure sleeve, which is fixedly and sealingly connected to the mounting port.

[0011] Optionally, the port of the oil inlet facing the steel ball is formed with a first arc-shaped groove that fits against the surface of the steel ball.

[0012] Optionally, the end of the plunger that abuts against the steel ball has a second arc-shaped groove that fits against the surface of the steel ball.

[0013] Optionally, the diameter of the plunger boss is smaller than the inner diameter of the overflow cavity.

[0014] Secondly, this application also provides a hydraulic tool, which includes a cylinder, an oil tank, and an overflow valve as described in any embodiment of the first aspect. The overflow valve is connected to the cylinder and the oil tank respectively, and is used to unload oil between the cylinder and the oil tank.

[0015] Compared with the prior art, this application has the following advantages: the oil inlet and oil outlet are located on the same side of the plunger boss, and the hydraulic oil only needs to push the steel ball open a short distance to discharge the oil. Compared with setting the oil inlet and oil outlet on two sides of the plunger boss, it can achieve rapid oil discharge. Attached Figure Description

[0016] The specific embodiments of this application will be described in further detail below with reference to the accompanying drawings:

[0017] Figure 1 This is a schematic diagram of the structure of a steel ball sealing the oil inlet of an overflow valve provided in this application;

[0018] Figure 2 This is a structural schematic diagram of an overflow valve in the oil unloading state provided in this application, wherein the arrows indicate the flow direction of the hydraulic oil;

[0019] Figure 3 This is a schematic diagram of the structure of an overflow valve provided in this application;

[0020] Figure 4 This is a schematic diagram of another type of overflow valve provided in this application.

[0021] Meaning of the reference numerals in the diagram:

[0022] 100, Valve body; 110, Overflow chamber; 120, Oil inlet; 130, Oil outlet; 200, Plunger; 300, Steel ball; 210, Plunger boss; 700, Elastic element; 140, Mounting groove; 400, Sealing ring; 500, Gasket; 150, Mounting port; 600, Pressure sleeve; 121, First arc-shaped groove; 220, Second arc-shaped groove. Detailed Implementation

[0023] The terminology used in this application is for the purpose of describing specific embodiments only and is not intended to limit the application. For example, terms such as "upper," "lower," "front," and "rear" that indicate orientation or positional relationship are based solely on the orientation or positional relationship shown in the accompanying drawings and are used only for the convenience of describing the application and simplifying the description, and are not intended to indicate or imply that the device / component referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the application.

[0024] Please refer to Figures 1-2 , Figure 1 This is a schematic diagram of the structure of a relief valve in which a steel ball 300 blocks the oil inlet hole 120, as provided in this application. Figure 2 This is a structural schematic diagram of a relief valve in its unloading state, as provided in this application, where the arrows indicate the flow direction of the hydraulic oil. This application provides a relief valve comprising a valve body 100, a plunger 200, and an elastic element 700. The valve body 100 forms an overflow chamber 110 and an inlet port 120 and an outlet port 130 communicating with the overflow chamber 110. The plunger 200 is movably mounted on the valve body 100, with its first end located outside the valve body 100 and its second end extending into the overflow chamber 110 of the valve body 100. The plunger 200 has a radially formed plunger boss 210, and the outlet port 130 is located on the side of the plunger boss 210 near the inlet port 120. The elastic element 700 abuts against the plunger boss 210 and the valve body 100. A steel ball 300 abuts against the second end of the plunger 200. During pressure holding, the plunger 200 presses the steel ball 300 against the port of the oil inlet 120 under the action of the elastic element 700; during pressure release, the high-pressure oil overcomes the force of the elastic element 700 and pushes the steel ball 300 away from the port of the oil inlet 120.

[0025] In the above implementation process, during oil unloading, high-pressure oil enters the inlet hole 120, resists the elastic force of the elastic element 700, pushes open the steel ball 300, and the high-pressure oil enters the overflow chamber 110, then flows back into the oil tank through the outlet hole 130. If the plunger 200 presses against the steel ball 300 to block the inlet hole 120, and the inlet hole 120 and the outlet hole 130 are located on opposite sides of the plunger boss 210, the hydraulic oil needs to wait for the plunger boss 210 to move to the same side as the outlet hole 130 before unloading, or the hydraulic oil needs to flow through the gap between the plunger boss 210 and the inner wall of the overflow chamber 110 to reach the outlet hole 130 for unloading. This results in a slow unloading speed, which cannot unload quickly and affects actual working efficiency. Therefore, this application sets the inlet hole 120 and the outlet hole 130 to be located on the same side of the plunger boss 210, which can achieve rapid oil unloading.

[0026] In addition, compared with directly using the elastic element 700 to block or open the oil inlet hole 120 by abutting the steel ball 300, this application sets the plunger 200 to bear the preload of the elastic element 700 and then transmit it to the steel ball 300. The plunger 200 and the steel ball 300 achieve a stable installation and limiting fit through the groove, so that the steel ball 300 does not tilt after being subjected to force, returns to the correct position, has good opening and closing performance, reliable oil seal, and low noise.

[0027] It should be understood that the oil inlet 120 and oil outlet 130 being located on the same side of the plunger boss 210 in the axial direction means that at any position of the plunger boss 210 during its stroke, both the oil inlet 120 and oil outlet 130 are located on the same side of the plunger boss 210 in the axial direction. The aforementioned axial direction refers to the axial direction of the plunger 200, and the plunger 200 moves along its axial direction.

[0028] In one possible implementation, please refer to Figure 3 In the oil inlet direction, the lowest point of the port formed by the oil outlet 130 on the valve body 100 is flush with the highest point of the port formed by the oil inlet 120 on the valve body 100, or, please refer to Figure 4 In the oil inlet direction, the port formed by the oil outlet 130 on the valve body 100 and the port formed by the oil inlet 120 on the valve body 100 are at least partially overlapped in the axial direction.

[0029] In the above implementation scheme, since the distance between the port of the oil inlet 120 and the port of the oil outlet 130 in the oil inlet direction is small or even coincides, the high pressure oil can push the steel ball 300 a short distance to discharge oil through the oil outlet 130.

[0030] In one possible implementation, the elastic element 700 is a spring, which is sleeved on the outer periphery of the plunger 200.

[0031] In the above implementation process, a spring is used to sleeve the cylindrical plunger 200. The two ends of the spring abut against the valve body 100 and the plunger boss 210 respectively. The structure is simple and stable, and can provide a directionally stable preload for the steel ball 300, thereby improving the opening and closing stability of the steel ball 300.

[0032] In one possible implementation, the valve body 100 and the plunger 200 cooperate to form a mounting groove 140 with the opening facing the elastic member 700. A sealing ring 400 is provided in the mounting groove 140 to seal the valve body 100 and the plunger 200. A gasket 500 is provided on the side of the sealing ring 400 near the elastic member 700. The gasket 500 is sleeved on the plunger 200, and the elastic member 700 abuts against the gasket 500.

[0033] In the above implementation process, for ease of installation, the sealing ring 400 is fitted into the mounting groove 140 between the valve body 100 and the plunger 200. Since the opening of the mounting groove 140 faces the elastic element 700, if the elastic element 700 is directly abutted against the valve body 100, it may interfere with the sealing ring 400, causing sealing failure or accelerating wear. Therefore, a gasket 500 is placed between the sealing ring 400 and the elastic element 700 to isolate them, thus extending the service life of the sealing ring 400.

[0034] In one possible implementation, one end of the valve body 100 is formed with an installation port 150, and the relief valve also includes a pressure sleeve 600, which is fixedly and sealingly connected to the sealing port.

[0035] In the above implementation process, an installation port 150 is opened at one end of the valve body 100 to facilitate the installation of the steel ball 300, plunger 200 and spring into the overflow chamber 110, and then the pressure sleeve 600 is used to seal the installation port 150.

[0036] In one possible implementation, the port of the oil inlet 120 facing the steel ball 300 is formed with a first arcuate groove 121 that fits against the surface of the steel ball 300.

[0037] In the above implementation process, an arc-shaped groove that fits against the surface of the steel ball 300 is provided at the oil inlet port 120, which can improve the sealing performance of the steel ball 300 to the oil inlet port 120.

[0038] In one possible implementation, the plunger 200 abutting against the steel ball 300 has a second arcuate groove 220 that fits against the surface of the steel ball 300.

[0039] In the above implementation process, a second arc-shaped groove 220 is provided on the plunger 200 to fit the surface of the steel ball 300, which can improve the stability of the fit between the steel ball 300 and the plunger 200, prevent the steel ball 300 from detaching from the plunger 200 during operation, and thus improve the overall stability of the relief valve structure.

[0040] In one possible implementation, the diameter of the plunger boss 210 is smaller than the inner diameter of the overflow cavity 110.

[0041] In the above implementation process, the diameter of the plunger boss 210 is set to be smaller than the inner diameter of the overflow cavity 110. During the movement of the plunger boss 210, there will be no friction between it and the overflow cavity 110, which can improve the stability of the overflow valve operation.

[0042] This application also provides a hydraulic tool, which includes a cylinder, an oil tank, and an overflow valve as described in any of the above embodiments. The overflow valve is connected to the cylinder and the oil tank respectively, which can quickly unload oil.

[0043] This application is not limited to the specific embodiments described above. Those skilled in the art will readily understand that many alternative solutions exist for the lawnmower of this application without departing from the principles and scope thereof. The scope of protection of this application is determined by the claims.

Claims

1. An overflow valve, characterized in that, include: The valve body (100) has an overflow chamber (110) and an oil inlet (120) and an oil outlet (130) communicating with the overflow chamber (110). A plunger (200) is movably mounted on the valve body (100). The first end of the plunger (200) is located outside the valve body (100), and the second end extends into the overflow chamber (110) of the valve body (100). A plunger boss (210) is formed radially on the plunger (200), and the oil outlet (130) is located on the side of the plunger boss (210) near the oil inlet (120). The elastic element (700) abuts against the plunger boss (210) and the valve body (100); A steel ball (300) abuts against the second end of the plunger (200); During pressure holding, the plunger (200) presses the steel ball (300) against the port of the oil inlet (120) under the action of the elastic element (700); during pressure release, the high-pressure oil overcomes the force of the elastic element (700) and pushes the steel ball (300) away from the port of the oil inlet (120).

2. The overflow valve according to claim 1, characterized in that, In the oil inlet direction, the lowest point of the port formed by the oil outlet (130) on the valve body (100) is parallel to the highest point of the port formed by the oil inlet (120) on the valve body (100).

3. The overflow valve according to claim 1, characterized in that, In the oil inlet direction, the port formed by the oil outlet (130) on the valve body (100) and the port formed by the oil inlet (120) on the valve body (100) are at least partially overlapped in the axial direction.

4. The overflow valve according to claim 1, characterized in that, The elastic element (700) is a spring, which is sleeved on the outer periphery of the plunger (200).

5. The overflow valve according to claim 1, characterized in that, The valve body (100) and the plunger (200) cooperate to form a mounting groove (140) with the opening facing the elastic member (700). A sealing ring (400) is provided in the mounting groove (140) to seal the valve body (100) and the plunger (200). A gasket (500) is provided on the side of the sealing ring (400) near the elastic member (700). The gasket (500) is sleeved on the plunger (200), and the elastic member (700) abuts against the gasket (500).

6. The overflow valve according to claim 1, characterized in that, One end of the valve body (100) is formed with a mounting port (150); The overflow valve also includes a pressure sleeve (600), which is fixedly and sealed to the mounting port (150).

7. The overflow valve according to claim 1, characterized in that, The oil inlet (120) facing the steel ball (300) has a first arc-shaped groove (121) that fits against the surface of the steel ball (300).

8. The overflow valve according to claim 1, characterized in that, The plunger (200) has a second arc-shaped groove (220) that fits against the surface of the steel ball (300) at one end.

9. The overflow valve according to claim 1, characterized in that, The diameter of the plunger boss (210) is smaller than the inner diameter of the overflow cavity (110).

10. A hydraulic tool, characterized in that, The system includes a hydraulic cylinder, an oil tank, and an overflow valve as described in any one of claims 1-9, wherein the overflow valve is connected to the hydraulic cylinder and the oil tank respectively, and is used to unload oil between the hydraulic cylinder and the oil tank.

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