A zero leakage hydraulic check valve

Abstract

A zero-leakage hydraulic one-way valve, comprising: a valve sleeve having a first oil port in the middle of the front end and a second oil port in the side, a valve core, and a valve core return spring, wherein the valve core is composed of a support, a push rod and a rubber pad, the support is slidably matched with the inner wall of the valve sleeve and forms a first oil groove extending in the front-to-back direction, the front end of the support is provided with a second oil groove, the outer wall of the push rod is provided with a rivet groove, the push rod is inserted in the support and riveted and fixed to the support through the rivet groove, the outer wall of the push rod is provided with an annular installation groove at the front end, the rubber pad is provided in the installation groove, the outer side of the rubber pad contacts and matches with the inner side of the support, the front side of the rubber pad protrudes from the front end of the support and is directly opposite to the position around the corresponding first oil port of the front end of the valve sleeve. The rubber pad on the above-mentioned valve core adopts a fully built-in installation, so that the consistency of the rubber pad installed on the valve core is better.

Description

Technical Field

[0001] The invention relates to the technical field of hydraulic transmission, in particular to a zero-leakage hydraulic one-way valve. Background Art

[0002] The hydraulic check valve is a commonly used component in hydraulic transmission applications. The function of the hydraulic check valve is to allow the pressure oil to enter the other oil port from one oil port of the hydraulic check valve, but not to enter the one oil port from the other oil port. Another function is to prevent leakage and maintain the pressure of the other oil port.

[0003] Traditional hydraulic check valves are generally ball valves and cone valves. The sealing part between the valve core and the valve sleeve (i.e., the valve body) of the ball valve is a spherical structure, and the sealing part between the valve core and the valve sleeve of the cone valve is a conical structure. The seal is achieved by squeezing the spherical or conical surface of the valve core and the orifice on the valve sleeve. The valve core and valve sleeve of this type of hydraulic check valve are both metal parts. Due to the influence of the processing accuracy and finish of the sealing part and the orifice, as well as the wear and tear caused by long-term use, the hydraulic check valve is prone to oil leakage.

[0004] The patent document with the announcement number CN102486238A discloses a one-way valve, in which a first truncated cone is provided below the spherical crown of the valve core, a first annular groove is provided between the spherical crown and the first annular groove, a sealing ring is clamped in the annular groove, an annular sealing line corresponding to the sealing ring is provided on the valve body, the diameter of the annular sealing line is between the outer diameter of the bottom surface of the spherical crown and the outer diameter of the sealing ring, and the sealing is achieved by the contact between the annular sealing line and the sealing ring. The patent document with the announcement number CN202152868U discloses a one-way valve, in which an annular groove is provided in the middle of the conical surface of the valve core, a first O-ring is clamped in the annular groove, and the sealing is achieved by the contact between the valve port and the first O-ring. The patent document with the announcement number CN101943279A discloses a one-way valve and an anesthesia machine, in which a sealing gasket is provided between the first end air inlet and the second end air inlet, an air outlet notch is provided on the edge of the sealing gasket, and the sealing is achieved by the contact between the sealing gasket and the support platform at the second end air inlet. In the above patent documents, a sealing ring is provided between the valve core and the valve sleeve of the one-way valve, and the sealing ring is used to realize the sealing function of the one-way valve in the closed state, thereby overcoming the above defects of the traditional hydraulic one-way valve to a certain extent. However, in the solutions recorded in these patent documents, the sealing ring is separated from the valve body and the valve core (such as CN101943279A), or the sealing ring is clamped in the annular clamping groove on the valve core through the inner sleeve (such as CN102486238A and CN202152868U). Since the sealing ring is an elastic body, it is easy to deform after being subjected to external force. Therefore, when the sealing ring is fixed to the valve core or installed in the valve cavity by the sleeve clamping method, the sealing ring is easy to deform, and the consistency of the sealing ring installation on the valve core is poor, which will lead to poor consistency of the sealing effect and the pressure holding effect of the one-way valve, and even some products will leak oil.

[0005] The present invention further proposes an improvement scheme based on the above-mentioned defects in the prior art. Summary of the invention

[0006] The purpose of the present invention is to provide a zero-leakage hydraulic one-way valve, which improves the consistency of the installation of a rubber pad (ie, a sealing ring) on ​​the valve core by improving the valve core structure of the one-way valve.

[0007] To achieve the above object, the technical solution adopted by the present invention is as follows:

[0008] A zero-leakage hydraulic one-way valve, comprising:

[0009] The valve sleeve has a first oil port in the middle of its front end and a second oil port in its side;

[0010] a spring, which provides elastic force for the valve core to move toward the front end of the valve sleeve; and

[0011] A valve core is assembled in the valve sleeve and can move in a direction approaching or away from the first oil port. The valve core is composed of a support, a push rod and a rubber pad. The support is slidably matched with the inner wall of the valve sleeve and forms a first oil groove extending in the front-to-back direction. A second oil groove is provided at the front end of the support. A rivet groove is provided on the outer wall of the push rod. The push rod is inserted in the support and riveted and fixed to the support through the rivet groove. An annular mounting groove is provided at the front end of the outer wall of the push rod. The rubber pad is provided in the mounting groove. The outer side of the rubber pad contacts and cooperates with the inner side of the support. The front side of the rubber pad protrudes from the front end of the support and is directly opposite to the position around the front end of the valve sleeve corresponding to the first oil port.

[0012] By adopting the combined valve core structure composed of the above-mentioned support and push rod, the rubber gasket on the valve core can be fully installed inside, and the entire areas of the inner, outer and rear sides of the rubber gasket, as well as part of the front side of the rubber gasket are in contact with the valve core and are limited, so that the consistency of the rubber gasket installation on the valve core is better, thereby improving the consistency of the sealing effect and the consistency of the pressure maintaining effect of the one-way valve.

[0013] Preferably, the front end of the push rod has an extension portion extending forward into the first oil hole, and a third oil groove is provided on the surface of the extension portion.

[0014] Preferably, along the direction from the rear end to the front end, the diameter of the extension portion gradually decreases, and the diameter of the first oil port gradually increases.

[0015] Preferably, the support is a polygonal column structure, and the inner cavity of the valve sleeve is a cylindrical structure.

[0016] Preferably, a circular area at the end of the support with the center point as the center is recessed into the support to form a positioning groove, and the front end of the spring is installed in the positioning groove.

[0017] Compared with the prior art, the present invention has at least the following beneficial effects:

[0018] The rubber gasket on the valve core is installed in a fully built-in manner, so that the consistency of the rubber gasket installed on the valve core is better, thereby improving the consistency of the sealing effect and the consistency of the pressure maintaining effect of the one-way valve.

[0019] The valve core has a simple structure and is easy to assemble.

[0020] An extension portion is further provided at the front end of the valve core push rod. The shape of the extension portion and the above-mentioned design of the first oil hole diameter guide the oil to the middle of the front end of the valve core, which can reduce the interference between the valve core and the valve sleeve when the valve core moves, and improve the reliability of the one-way valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1It is a structural schematic diagram of a typical embodiment of a zero-leakage hydraulic one-way valve;

[0022] Figure 2 is a schematic diagram of the second oil port and the first oil groove;

[0023] Figure 3 It is a structural schematic diagram of the valve core;

[0024] Figure 4 is a schematic diagram of the structure of the ejector rod;

[0025] Figure 5 is a structural schematic diagram of the support;

[0026] Figure numerals: 1. spring; 2. valve core; 3. valve sleeve; 4. second oil port; 5. outer sealing ring; 6. front end of valve sleeve; 7. first oil port; 8. first oil groove; 21. positioning groove; 22. support; 23. riveted part; 24. push rod; 25. rubber pad; 221. second oil groove; 241. third oil groove; 242. extension part; 243. mounting groove; 244. riveted groove. DETAILED DESCRIPTION

[0027] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0028] Please refer to Figure 1 to Figure 2 The zero leakage hydraulic one-way valve comprises: a valve sleeve 3, a spring 1, and a valve core 2. The front middle of the valve sleeve 3 has a first oil port 7, and the side of the valve sleeve 3 has a second oil port 4. The valve core 2 is assembled in the valve sleeve 3 and can move in a direction close to or away from the first oil port 7. The spring 1 is arranged between the rear end of the valve core 2 and the valve sleeve 3 to provide elastic force for the valve core 2 to move toward the front end of the valve sleeve 3. An outer sealing ring 5 is arranged in the annular groove of the outer wall of the valve sleeve 3.

[0029] The valve core 2, more specifically, the support of the valve core 2 is slidably matched with the inner wall of the valve sleeve 3, and a first oil groove 8 extending in the front-to-back direction is formed.

[0030] Wherein, the valve core 2 is a combined structure.

[0031] Reference Figures 3 to 5 The valve core 2 is composed of a support 22, a push rod 24 and a rubber pad 25. The front end of the support 22 is provided with a second oil groove 221. The outer wall of the push rod 24 is provided with a rivet groove 244. The push rod 24 is inserted into the support 22 and riveted to the support 22 through the rivet groove 244. The outer wall of the push rod 24 is provided with an annular mounting groove 243 at the front end. The rubber pad 25 is sleeved in the mounting groove 243. The outer side of the rubber pad 25 contacts and cooperates with the inner side of the support 22. The front side of the rubber pad 25 protrudes from the front end of the support 22. Figure 1The protruding portion is aligned with the position of the front end of the valve sleeve 3 corresponding to the first oil port 7 , and the two are squeezed and matched under the elastic force of the spring 1 to achieve sealing of the first oil port 7 .

[0032] When there is pressurized oil in the first oil port 7, the pressurized oil pushes the valve core 2 to separate from the first oil port 7, and the pressurized oil enters the valve sleeve 3 from the first oil port 7, and enters the second oil port 4 after passing through the second oil groove 221 and the first oil groove 8. When the first oil port 7 stops supplying pressurized oil, the spring 1 pushes the valve core 2 to reset, and the rubber pad 25 on the valve core 2 and the front end of the valve sleeve 3 corresponding to the position around the first oil port 7 are squeezed and sealed, and the one-way valve enters a closed state, and the pressurized oil in the second oil port 4 cannot enter the first oil port 7.

[0033] In the above embodiment, by adopting a combined valve core structure consisting of a support 22 and a push rod 24, the rubber pad 25 on the valve core 2 is fully installed inside, and the entire areas of the inner, outer and rear sides of the rubber pad 25, as well as a partial area of ​​the front side of the rubber pad 25 are in contact with the valve core 2 and are limited, so that the consistency of the installation of the rubber pad 25 on the valve core 2 is better, thereby improving the consistency of the sealing effect of the one-way valve and the consistency of the pressure maintaining effect.

[0034] The push rod 24 and the support 22 of the valve core 2 are fixed by riveting, and the riveted part 23 is Figure 3 This makes the valve core 2 convenient for automated assembly and production.

[0035] Combination Figure 1 and Figure 4 Furthermore, the front end of the push rod 24 has an extension portion 242 extending forward into the first oil hole, and the surface of the extension portion 242 is provided with a third oil groove 241. Along the direction from the rear end to the front end, the diameter of the extension portion 242 gradually decreases, and the diameter of the first oil port 7 gradually increases. When there is pressurized oil in the first oil port 7, the pressurized oil is guided by the conical surface of the first oil port 7, flows from the edge to the center, and finally acts on the conical surface of the extension portion 242 of the push rod 24, so that the front end center of the valve core 2 is subjected to force, pushing the valve core 2 to move to the rear without interfering with the valve sleeve 3, thereby improving the reliability of the one-way valve.

[0036] Combination Figure 1 and Figure 5Furthermore, the support 22 is a hexagonal prism structure, and the inner cavity of the valve sleeve 3 is a cylindrical structure. The first oil groove 8 is formed by the cylindrical surface of the hexagonal prism and the inner cavity surface of the valve sleeve 3, and the edge of the hexagonal prism cooperates with the inner cavity surface of the valve sleeve 3 to guide the movement of the valve core 2. The guiding mechanism of the first oil groove 8 and the valve core is realized by this structure, which has the characteristics of simple structure and easy manufacturing. It should be understood that the support 22 can also be a multi-prism structure with other numbers of sides. Or the pillar can also adopt a cylindrical structure that is compatible with the inner cavity of the valve sleeve 3, and a groove body is opened on the outer surface of the cylindrical structure to form the first oil groove 8.

[0037] Combination Figure 1 and Figure 3 Furthermore, a circular area with the center point as the center of the end of the support 22 is recessed into the support 22 to form a positioning groove 21, and the front end of the spring 1 is installed in the positioning groove 21. In this way, the center line of the spring 1 coincides with the center line of the valve core 2, which can further reduce the interference between the valve core 2 and the valve sleeve 3 when the valve core 2 moves, and further improve the reliability of the one-way valve.

[0038] The present invention is described in detail above through specific embodiments, and these detailed descriptions are only limited to helping those skilled in the art understand the content of the present invention, and cannot be understood as limiting the scope of protection of the present invention. Various modifications, equivalent transformations, etc. made by those skilled in the art to the above scheme under the conception of the present invention should be included in the scope of protection of the present invention.

Claims

1. A zero-leakage hydraulic one-way valve, characterized in that: include: A valve sleeve (3) having a first oil port (7) at the middle of its front end and a second oil port (4) at its side; A spring (1) which provides elastic force for the valve core (2) to move toward the front end of the valve sleeve (3); and A valve core (2) is assembled in the valve sleeve (3) and can move in a direction approaching or moving away from the first oil port (7). The valve core (2) is composed of a support (22), a push rod (24) and a rubber pad (25). The support (22) is slidably matched with the inner wall of the valve sleeve (3) and forms a first oil groove (8) extending in the front-to-back direction. A second oil groove (221) is provided at the front end of the support (22). A rivet groove (244) is provided on the outer wall of the push rod (24). The push rod (24) is inserted into the support (22) and is riveted and fixed to the support (22) through the rivet groove (244). The outer wall of the push rod (24) An annular mounting groove (243) is provided at the front end, the rubber pad (25) is provided in the mounting groove (243), the outer side of the rubber pad (25) contacts and cooperates with the inner side of the support (22), the front side of the rubber pad (25) protrudes from the front end of the support (22) and is directly opposite to the position around the first oil port (7) corresponding to the front end of the valve sleeve (3); the front end of the push rod (24) has an extension portion (242) extending forward into the first oil port, and the surface of the extension portion (242) is provided with a third oil groove (241); the support (22) is a multi-prism structure, and the inner cavity of the valve sleeve (3) is a cylindrical structure.

2. The zero-leakage hydraulic one-way valve according to claim 1, characterized in that: Along the direction from the rear end to the front end, the diameter of the extension portion (242) gradually decreases, and the diameter of the first oil port (7) gradually increases.

3. The zero-leakage hydraulic one-way valve according to claim 1, characterized in that: A circular area at the end of the support (22) with the center point as the center is recessed into the support (22) to form a positioning groove (21), and the front end of the spring (1) is installed in the positioning groove (21).

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