Anti-impact and wear-resistant hydraulically controlled one-way valve

Abstract

The present invention discloses an impact-resistant and wear-resistant hydraulically controlled one-way valve, comprising a valve cover, a valve body, a valve core, a valve seat, and a control valve core. The upper part of the valve seat is connected to the lower part of the valve body by threads, the lower part of the valve body is provided with a valve cavity, the upper part of the valve body is provided with a buffer cavity, and the valve cover is installed on the top of the valve body; a valve port is arranged in the valve seat, an upper cavity is arranged above the valve port, and a lower cavity is arranged below the valve port, and a control valve core is installed in the lower cavity of the valve seat, and the valve core is placed in the upper cavity of the valve seat and the valve cavity of the valve body, and the valve stem of the valve core is provided with a return spring, and the valve stem of the valve core passes through the center hole of the valve body and extends into the buffer cavity, and the diameter of the center hole of the valve body is larger than the diameter of the valve stem, so that a gap is left between the valve stem and the valve body. The present invention arranges a buffer cavity in the valve body, and reserves a throttling gap between the valve body and the valve core. The hydraulically controlled one-way valve can effectively reduce the wear of the valve core end face caused by pressure fluctuations and frequent impacts on the valve core, and increase the service life.

Description

Technical Field

[0001] The invention relates to a hydraulically controlled one-way valve in a hydraulic system, and in particular to an impact-resistant and wear-resistant hydraulically controlled one-way valve. Background Art

[0002] Hydraulic control check valves are widely used in locking hydraulic cylinders and maintaining system pressure, such as locking the outrigger cylinders of cranes, maintaining system pressure in cone crushers, etc. Under stable load conditions, general hydraulic control check valves can be used to lock hydraulic cylinders and maintain system pressure. However, when the load in the system is subjected to severe and frequent impacts, the valve core will impact the valve body violently and frequently, causing wear on the sealing surfaces of the valve core and the valve body, resulting in failure to lock the hydraulic cylinder and maintain system pressure, greatly reducing the service life of the hydraulic control check valve. Summary of the invention

[0003] In order to solve the problem that the valve core and the sealing surface of the valve body of the hydraulically controlled one-way valve are easily worn and the service life is shortened when the load in the system is severely impacted and impacted frequently, the present invention provides an impact-resistant and wear-resistant hydraulically controlled one-way valve, a buffer chamber is arranged in the valve body, and a throttling gap is reserved between the valve body and the valve core. The hydraulically controlled one-way valve can effectively reduce the wear of the valve core end face caused by pressure fluctuations and frequent impacts on the valve core, thereby increasing the service life.

[0004] The technical solution adopted by the present invention to solve its technical problems is: an impact-resistant and wear-resistant hydraulically controlled one-way valve, comprising a valve cover, a valve body, a valve core, a valve seat, and a control valve core. The upper part of the valve seat is connected to the lower part of the valve body by threads, the lower part of the valve body is provided with a valve cavity, the upper part of the valve body is provided with a buffer cavity, and a valve cover is installed on the top of the valve body; a valve port is arranged in the valve seat, an upper cavity is arranged above the valve port, and a lower cavity is arranged below the valve port, a control valve core is installed in the lower cavity of the valve seat, the valve core is placed in the upper cavity of the valve seat and the valve cavity of the valve body, the valve stem of the valve core is fitted with a return spring, the valve stem of the valve core passes through the center hole of the valve body and extends into the buffer cavity, the diameter of the center hole of the valve body is larger than the diameter of the valve stem, so that a gap is left between the valve stem and the valve body.

[0005] Further preferably, the area of ​​the valve stem is equal to the area of ​​the valve port.

[0006] Further preferably, the gap between the valve stem and the valve body is 0.02-0.07 mm.

[0007] Further preferably, the valve cover is provided with a plug, and the distance between the end face of the plug and the end face of the valve stem is the maximum opening distance of the valve core.

[0008] Further preferably, a valve ball is provided at the lower end of the valve core, and the valve port is blocked by the valve ball.

[0009] Further preferably, the valve body and the valve cover are welded into a whole or are detachably connected.

[0010] Further preferably, a third oil port connected to the upper cavity and a second oil port connected to the lower cavity are provided on the side of the valve seat, and the bottom end of the valve seat is the first oil port.

[0011] Further preferably, a first sealing ring is sleeved on the outer surface of the valve body, a second sealing ring and a fourth sealing ring are sleeved on the outer surface of the valve seat, the third oil port is located between the first sealing ring and the second sealing ring, the second oil port is located between the second sealing ring and the fourth sealing ring, and the control valve core is sleeved with a third sealing ring.

[0012] The technical effect of the present invention is as follows: the force of the pressure on the valve core to impact the valve body is offset by making the valve stem area of ​​the valve core equal to the valve port area, and at the same time a buffer chamber is added to the upper part of the valve body, leaving a gap between the valve stem of the valve core and the valve body, so that the hydraulic oil flows into the buffer chamber through the gap, thereby playing a throttling role, and further buffering the load force acting on the end face of the valve stem, which can effectively reduce the wear of the valve core end face caused by pressure fluctuations and frequent impacts on the valve core, and increase the service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a cross-sectional structural diagram of the present invention.

[0014] In the figure: 1. Blockage; 2. Valve cover; 3. Valve body; 4. Return spring; 5. Valve core; 6. Valve seat; 7. Control valve core; 8. Third oil port; 9. Second oil port; 10. First oil port; 11. Buffer chamber; 12. Throttling gap; 13. First sealing ring; 14. Second sealing ring; 15. Third sealing ring; 16. Fourth sealing ring; 17. Valve port. DETAILED DESCRIPTION

[0015] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0016] Reference Figure 1The impact-proof and wear-resistant hydraulically controlled one-way valve is composed of a plug 1, a valve cover 2, a valve body 3, a valve core 5, a valve seat 6, and a control valve core 7. The upper part of the valve seat 6 is connected to the lower part of the valve body 3 by threads. The lower part of the valve body 3 is provided with a valve cavity, and the upper part of the valve body 3 is provided with a buffer cavity 11. The top of the valve body 3 is provided with a valve cover 2, and the valve cover 2 is provided with a plug 1; the valve seat 6 is provided with a valve port 17, and the valve port 17 is used as the boundary. The upper part of the valve seat 6 is provided with an upper cavity, and the lower part of the valve seat 6 is provided with a lower cavity. The control valve core 7 is installed in the lower cavity of the valve seat 6. The valve core 7 and the valve core 5 are placed in the upper cavity of the valve seat 6 and the valve cavity of the valve body 3. The valve stem of the valve core 5 is fitted with a return spring 4. The valve stem of the valve core 5 passes through the center hole of the valve body 3 and extends into the buffer cavity 11. A valve ball is arranged at the lower end of the valve core 5, and the valve port 17 is blocked by the valve ball. The area of ​​the valve stem on the valve core 5 is the same as the area of ​​the valve port 17. The diameter of the center hole of the valve body 3 is larger than the diameter of the valve stem, so that a gap 12 is formed between the valve stem and the valve body 3, and the size of the gap 12 is 0.02-0.07mm.

[0017] The valve body 3 and the valve cover 2 can be welded into a whole or detachably connected. The distance between the end face of the plug 1 and the end face of the valve stem is the maximum opening distance of the valve core 5. The side of the valve seat 6 is provided with a third oil port 8 connected to the upper cavity and a second oil port 9 connected to the lower cavity. The bottom end of the valve seat 6 is a first oil port 10. The outer surface of the valve body 3 is sleeved with a first sealing ring 13, and the outer surface of the valve seat 6 is sleeved with a second sealing ring 14 and a fourth sealing ring 16. The third oil port 8 is located between the first sealing ring 13 and the second sealing ring 14, and the second oil port 9 is located between the second sealing ring 14 and the fourth sealing ring 16. The control valve core 7 is sleeved with a third sealing ring 15.

[0018] Since the area of ​​the valve stem is the same as the area of ​​the valve port, the load force on the valve core 5 in the valve seat 6 and the valve body 3 is balanced, and the load force acting on the valve core 5 is all concentrated on the valve stem end face of the valve core 5. A gap 12 of 0.02-0.07mm is left between the valve stem and the valve body. The gap 12 plays a throttling role, which effectively buffers the load force acting on the valve stem end face. At the same time, the size of the buffer cavity of the valve body 3 also affects the buffering effect. The larger the buffer cavity, the better the buffering effect.

[0019] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An impact-proof and wear-resistant hydraulically controlled one-way valve, comprising a valve cover, a valve body, a valve core, a valve seat, and a control valve core, wherein the upper portion of the valve seat is connected to the lower portion of the valve body by threads, and a valve cavity is provided at the lower portion of the valve body, and is characterized in that: A buffer cavity is provided on the upper part of the valve body, a valve cover is installed on the top of the valve body, a first sealing ring is sleeved on the outer surface of the valve body, a second sealing ring and a fourth sealing ring are sleeved on the outer surface of the valve seat, the third oil port is located between the first sealing ring and the second sealing ring, the second oil port is located between the second sealing ring and the fourth sealing ring, and the control valve core is sleeved with the third sealing ring; a valve port is arranged in the valve seat, an upper cavity is arranged above the valve port, a lower cavity is arranged below the valve port, a third oil port connected to the upper cavity and a second oil port connected to the lower cavity are arranged on the side of the valve seat, and the bottom end of the valve seat is the first oil port; a control valve core is installed in the lower cavity of the valve seat, the valve core is placed in the upper cavity of the valve seat and the valve cavity of the valve body, a valve stem of the valve core is sleeved with a return spring, the valve stem of the valve core passes through the center hole of the valve body and extends into the buffer cavity, the diameter of the center hole of the valve body is larger than the diameter of the valve stem, so that a gap is left between the valve stem and the valve body; the area of ​​the valve stem is equal to the area of ​​the valve port.

2. The impact-proof and wear-resistant hydraulically controlled one-way valve according to claim 1 is characterized in that: The gap between the valve stem and the valve body is 0.02-0.07mm.

3. The impact-proof and wear-resistant hydraulically controlled one-way valve according to claim 1 is characterized in that: The valve cover is provided with a plug.

4. The impact-proof and wear-resistant hydraulically controlled one-way valve according to claim 1 is characterized in that: A valve ball is arranged at the lower end of the valve core, and the valve port is blocked by the valve ball.

5. The impact-proof and wear-resistant hydraulically controlled one-way valve according to claim 1 is characterized in that: The valve body and the valve cover are welded into a whole or detachably connected.

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