Hydraulic control one-way valve

Abstract

The hydraulic control one-way valve comprises a valve body, a pressure relief hole and a connecting hole which are communicated with each other are formed in the valve body, a high-pressure pipe is inserted into the connecting hole, the end, inserted into the connecting hole, of the high-pressure pipe is further sleeved with a connecting nut, and the connecting nut is connected with the valve body and the high-pressure pipe through connecting threads opposite in screwing direction; a sealing ball used for sealing the end, communicated with the pressure relief hole, of the connecting hole is further arranged in the connecting hole, a pressure relief push rod is further arranged on the valve body in a sliding mode, and one end of the pressure relief push rod abuts against the sealing ball. The valve body is further provided with an adjusting module used for controlling the working state of the pressure relief push rod. Due to the fact that the connecting nut is connected with the valve body and the high-pressure pipe through the connecting threads opposite in screwing direction, when the connecting nut and the valve body are screwed down, extra axial thrust is applied to the high-pressure pipe, the end face of the high-pressure pipe is tightly attached to the end face of the valve body, and therefore the sealing performance is improved.

Description

Technical Field

[0001] This application relates to the field of fluid equipment technology, specifically to a hydraulically controlled check valve. Background Technology

[0002] In hydraulic control systems, with the maturity of related technologies and the continuous expansion of application scenarios, in order to obtain a very high thrust-to-weight ratio, the control pressure of hydraulic systems is getting higher and higher, and the pressure of some hydraulic systems can reach 400-500 MPa or more.

[0003] Currently, the operating pressure of hydraulic control valves in China is basically around 25MPa, with the highest reaching 50-75MPa; existing check valves cannot meet the sealing requirements of high-pressure hydraulic systems. Utility Model Content

[0004] The main objective of this application is to provide a hydraulically controlled check valve that addresses the shortcomings of poor sealing in existing technologies.

[0005] This application achieves the above objectives through the following technical solutions:

[0006] A hydraulically controlled check valve, comprising a valve body;

[0007] A pressure relief hole is provided on the valve body, and the valve body is also provided with a connection hole communicating with the pressure relief hole;

[0008] A high-pressure pipe, one end of which is inserted into the connection hole;

[0009] A connecting nut is fitted onto the end of the high-pressure pipe that is inserted into the connecting hole. The connecting nut connects the valve body and the high-pressure pipe respectively through connecting threads of opposite directions.

[0010] A sealing ball is disposed inside the connection hole, and the sealing ball is used to seal the end of the connection hole that communicates with the pressure relief hole;

[0011] A pressure relief push rod is slidably disposed in the valve body, with one end of the pressure relief push rod abutting against the sealing ball; the valve body is also provided with an adjustment module for controlling the working state of the pressure relief push rod.

[0012] Optionally, along the axial direction of the connecting hole, the connecting hole includes a threaded hole, an inner tapered hole, an adjusting hole, and a communicating hole that pass through in sequence, and the connecting nut is threadedly connected to the threaded hole; the communicating hole communicates with the pressure relief hole.

[0013] Optionally, the connecting nut is also threaded with a threaded sleeve, which is threadedly connected to the high-pressure pipe; the threads between the threaded sleeve and the connecting nut and the threads between the threaded sleeve and the high-pressure pipe have opposite directions of rotation.

[0014] Optionally, a limiting step is provided between the adjusting hole and the communicating hole, and the sealing ball is in close contact with the limiting step; the pressure relief push rod is also provided with a spherical groove that is in close contact with the outer surface of the sealing ball.

[0015] Optionally, along the axis of the high-pressure pipe, one end face of the high-pressure pipe is provided with an outer conical surface, which fits into the inner conical hole.

[0016] Optionally, the adjustment module includes a pressure relief piston and a drive module. The valve body is provided with an adjustment cavity that communicates with the pressure relief hole. The pressure relief piston is slidably disposed in the adjustment cavity. One end of the pressure relief piston abuts against the pressure relief push rod, and the other end is poweredly connected to the drive module.

[0017] Optionally, the adjustment module also includes a disc spring. One end of the pressure relief piston is provided with a thrust surface. The disc spring is sleeved on the pressure relief piston. Along the axial direction of the adjustment cavity, one end of the disc spring abuts against the inner end face of the adjustment cavity, and the other end abuts against the thrust surface.

[0018] Optionally, the drive module includes a pressure relief connector, which is threadedly connected to one end of the regulating cavity; the pressure relief connector is provided with an oil supply hole communicating with the regulating cavity.

[0019] Optionally, a first sealing groove is provided at the end of the pressure relief piston that is directly opposite to the pressure relief connector. A first sealing ring is fitted inside the first sealing groove. A compression chamber is provided on the end face of the first sealing ring that is directly opposite to the pressure relief connector. The compression chamber has an annular structure and extends along the axial direction of the first sealing ring.

[0020] Optionally, the pressure relief connector is also provided with a second sealing groove, and a second sealing ring is embedded in the second sealing groove.

[0021] Compared with the prior art, this application has the following beneficial effects:

[0022] This application includes a valve body, on which are provided a pressure relief hole and a connecting hole that communicate with each other. A high-pressure pipe is inserted into the connecting hole, and a connecting nut is fitted onto one end of the high-pressure pipe inserted into the connecting hole. The connecting nut connects the valve body and the high-pressure pipe respectively through connecting threads of opposite directions. A sealing ball for sealing the end of the connecting hole that communicates with the pressure relief hole is also provided in the connecting hole. A pressure relief push rod is also slidably provided on the valve body, and one end of the pressure relief push rod abuts against the sealing ball. An adjustment module for controlling the working state of the pressure relief push rod is also provided on the valve body.

[0023] In use, since the connecting nut connects the valve body and the high-pressure pipe respectively through connecting threads with opposite directions, when the connecting nut and the valve body are tightened, the end face of the high-pressure pipe will be pushed to fit against the end face of the valve body simultaneously, thereby achieving a seal through mechanical sealing.

[0024] At the same time, the external high-pressure fluid enters the connection hole through the high-pressure pipe. Under the pressure of the fluid, the sealing ball fits tightly against the end face of the connection hole, achieving a secondary seal for the oil circuit.

[0025] Compared with the prior art, this application cleverly applies extrusion pressure to the high-pressure pipe through a threaded connection with opposite rotation direction, thereby forming a tight sealing layer between the high-pressure pipe and the valve body, effectively improving the connection sealing performance between the high-pressure pipe and the valve body. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the structure of a hydraulically controlled check valve provided in Embodiment 1 of this application;

[0027] Figure 2 An exploded view of a hydraulically controlled check valve provided in Embodiment 1 of this application;

[0028] Figure 3 This is a schematic diagram of the valve body structure;

[0029] Figure 4 This is a schematic diagram of the structure of the first sealing ring;

[0030] Reference numerals: 1-Valve body, 2-Pressure relief hole, 3-Connecting hole, 4-High pressure pipe, 5-Connecting nut, 6-Sealing ball, 7-Pressure relief push rod, 8-Threaded sleeve, 9-Limiting step, 10-Spherical groove, 11-Outer conical surface, 12-Pressure relief piston, 13-Adjusting chamber, 14-Disc spring, 15-Thrust surface, 16-Pressure relief connector, 17-Oil inlet hole, 18-First sealing groove, 19-First sealing ring, 20-Squeezing chamber, 21-Second sealing groove, 22-Second sealing ring, 301-Threaded hole, 302-Inner conical hole, 303-Adjusting hole, 304-Connecting hole.

[0031] The purpose, features, and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0032] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0033] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0034] In this utility model, unless otherwise explicitly specified and limited, the terms "connection," "fixing," etc., should be interpreted broadly. For example, "fixing" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0035] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the meaning of "and / or" throughout the text includes three parallel solutions; for example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0036] Implementation Method 1

[0037] Reference Figures 1 to 4 This embodiment is an optional embodiment of this application, which discloses a hydraulically controlled check valve, including a valve body 1;

[0038] Along the height direction of the valve body 1, a pressure relief hole 2 is provided on the valve body 1. The pressure relief hole 2 passes through the axis of the valve body 1 and passes through its top and bottom surfaces.

[0039] Along the axial direction of the valve body 1, a connection hole 3 and an adjustment cavity 13 are also provided on the valve body 1. The connection hole 3 and the adjustment cavity 13 are symmetrically arranged on both sides of the pressure relief hole 2.

[0040] Along the axial direction of the valve body 1, the connecting hole 3 includes a threaded hole 301, an inner tapered hole 302, an adjusting hole 303, and a communicating hole 304 that pass through in sequence. The inner wall of the threaded hole is provided with a connecting thread. The communicating hole 304 communicates with the pressure relief hole 2. The inner diameter of the adjusting hole 303 is 1.2-1.5 times the inner diameter of the communicating hole 304, thereby forming a limiting step 9 between the adjusting hole 303 and the communicating hole 304.

[0041] The hydraulic control check valve also includes a high-pressure pipe 4, a connecting nut 5, and a threaded sleeve 8. The outer and inner circumferential surfaces of the threaded sleeve 8 are provided with connecting threads, and the threads rotate in opposite directions. The connecting nut 5 has an overall T-shaped structure, and the outer and inner circumferential surfaces of its small end are provided with connecting threads, and the threads rotate in the same direction.

[0042] One end of the high-pressure pipe 4 is connected to the threaded sleeve 8 via a connecting thread, and the threaded sleeve 8 is connected to the threaded nut 5 via a connecting thread on its outer circumferential surface; the connecting nut 5 is connected to the threaded hole 301 on the connecting hole 3.

[0043] The above structure enables the connecting nut 5 to connect the valve body 1 and the high-pressure pipe 4 respectively through connecting threads with opposite directions of rotation. That is, during the rotation of the connecting nut 5, since the connecting threads have opposite directions of rotation, the threaded sleeve 8 will push the high-pressure pipe 4 towards the pressure relief hole 2, thereby creating a mechanical compression seal between the end face of the high-pressure pipe 4 and the valve body 1 through an axial thrust, which effectively improves the sealing performance of the one-way valve.

[0044] Furthermore, an outer conical surface 11 is provided on the end face of the high-pressure pipe 4 that is inserted into the connecting hole 3, and the outer conical surface 11 is in close contact with the inner conical hole 302 on the connecting hole 3;

[0045] In conjunction with the axial thrust of the high-pressure pipe 4, the arrangement of the outer conical surface 11 and the inner conical hole 302 can effectively increase the contact surface between the high-pressure pipe 4 and the valve body 1, thereby increasing the area of ​​the sealing region and helping to improve the sealing performance of the valve body 1.

[0046] Secondly, the contact surfaces of the outer conical surface 11 and the inner conical hole 302 are inclined, and the force has axial and radial components. The radial component will effectively improve the tightness of the fit between the outer conical surface 11 and the inner conical hole 302, while the axial component will offset part of the reverse force of the high-pressure fluid, which is beneficial to improving the sealing performance of the valve body 1.

[0047] Furthermore, a sealing ball 6 is slidably disposed in the adjustment hole 303. The sealing ball 6 is preferably a high-hardness steel ball that has been quenched. The outer surface of the sealing ball 6 is in close contact with the limiting step 9.

[0048] Furthermore, the adjustment cavity 13 is connected to the pressure relief through a sliding hole, and a pressure relief push rod 7 is slidably disposed in the sliding hole. One end of the pressure relief push rod 7 is provided with a spherical groove 10, and the inner wall of the spherical groove 10 is tightly fitted with the outer surface of the sealing ball 6.

[0049] Since the inner diameter of the adjusting hole 303 is larger than the inner diameter of the connecting hole 304, the sealing ball 6 will closely abut against the corner of the limiting step 9, that is, the sealing ball 6 and the valve body 1 are in line contact, and the contact area between the two is extremely small; while the pressure relief push rod 7 contacts the sealing ball 6 through the spherical groove 10. The setting of the spherical groove 10 can increase the contact area between the pressure relief push rod 7 and the sealing ball 6, and the ratio between the above contact area and the contact area between the sealing ball 6 and the valve body 1 is 20-50. Based on the conversion formula of pressure and pressure intensity, due to the increase of the working area, the fluid pressure drop on the pressure relief push rod 7 will be reduced by 20-50 times, so the sealing ball 6 can be controlled with a smaller pressure, which effectively improves the convenience of one-way valve control operation, and no additional components are needed. The entire device has a simple structure and high reliability and stability.

[0050] Secondly, in actual use, the sealing ball 6 is embedded in the spherical groove 10, which effectively improves the stability of the connection and adjustment between the pressure relief push rod 7 and the sealing ball 6;

[0051] Furthermore, the hydraulic control check valve also includes an adjustment module, which includes a pressure relief piston 12 and a drive module. The pressure relief piston 12 is slidably disposed in the adjustment chamber 13. Along the axis of the pressure relief piston 12, an outwardly protruding rib is provided in the middle of the pressure relief piston 12, that is, the pressure relief piston 12 is generally cross-shaped, thereby forming steps at both ends of the pressure relief piston 12.

[0052] Along the axial direction of the pressure relief piston 12, one end of the pressure relief piston 12 has a thrust surface 15, and the outer circumferential surface of the other end is provided with a first sealing groove 18 in an annular structure; at the same time, a disc spring 14 is also sleeved on the end of the pressure relief piston 12. Along the axial direction of the adjustment cavity 13, one end of the disc spring 14 abuts against the inner end face of the adjustment cavity 13, and the other end abuts against the thrust surface 15.

[0053] The pressure relief piston 12 is connected to the pressure relief push rod 7;

[0054] The disc spring 14 enables the automatic reset of the pressure relief piston 12 and the pressure relief push rod 7.

[0055] Furthermore, the drive module includes a pressure relief connector 16, which is threadedly connected to one end of the adjustment cavity 13; the pressure relief connector 16 is provided with an oil supply hole 17 communicating with the adjustment cavity 13; a first sealing ring 19 is sleeved in the first sealing groove 18, the first sealing ring 19 is generally circular, and a squeezing cavity 20 is provided on the end face of the first sealing ring 19 facing the pressure relief connector 16, the squeezing cavity 20 is circular and extends along the axial direction of the first sealing ring 18;

[0056] That is, the cross-section of the first sealing ring 19 is U-shaped;

[0057] Meanwhile, a second sealing groove 21 is also provided on the pressure relief joint 16, and a second sealing ring 22 is embedded in the second sealing groove 21. The second sealing ring 22 is an O-ring.

[0058] When hydraulic oil enters the regulating chamber 13, it will directly enter the extrusion chamber 20 connected to the regulating chamber 13 and extrude radially to both sides of the extrusion chamber 20, thereby making the first sealing ring 19 tightly fit the valve body 1 and the pressure relief piston 12, thus improving the sealing performance.

[0059] When this application is used, high-pressure fluid enters the connection hole through the high-pressure pipe. Under the pressure of the fluid, the sealing ball fits tightly against the end face of the connection hole, thus controlling the oil circuit. When it is necessary to adjust the valve state, hydraulic oil is input into the adjustment chamber of the pressure relief connector box. Under the push of the hydraulic oil, the pressure relief piston slides and pushes the pressure relief push rod. The pressure relief push rod pushes the sealing ball to separate from the valve body, thereby opening the pressure relief hole and realizing high-pressure relief.

[0060] When there is no hydraulic oil input into the regulating chamber, the pressure relief piston moves in the opposite direction under the action of the disc spring. At this time, the sealing ball is in the closed state. When there is external high-pressure fluid input, the sealing ball will automatically seal.

[0061] Meanwhile, since the connecting nut connects the valve body and the high-pressure pipe respectively through connecting threads with opposite directions, when the connecting nut and the valve body are tightened, the end face of the high-pressure pipe will be pushed to fit against the end face of the valve body, thereby achieving a seal through mechanical sealing.

[0062] Compared with the prior art, this application cleverly applies extrusion pressure to the high-pressure pipe through a threaded connection with opposite rotation direction, thereby forming a tight sealing layer between the high-pressure pipe and the valve body, effectively improving the connection sealing performance between the high-pressure pipe and the valve body.

[0063] The above are merely preferred embodiments of this application and do not limit the patent scope of this application. Any equivalent structural or procedural transformations made using the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this application.

Claims

1. A hydraulically controlled check valve, characterized in that, Includes valve body (1); Pressure relief hole (2), the pressure relief hole (2) is provided on the valve body (1), and the valve body (1) is also provided with a connecting hole (3) communicating with the pressure relief hole (2); High-pressure pipe (4), one end of which is inserted into the connection hole (3); A connecting nut (5) is fitted onto one end of the high-pressure pipe (4) that is inserted into the connecting hole (3). The connecting nut (5) is connected to the valve body (1) and the high-pressure pipe (4) respectively by connecting threads with opposite directions. A sealing ball (6) is disposed in the connecting hole (3) and is used to seal the end of the connecting hole (3) that is connected to the pressure relief hole (2); A pressure relief push rod (7) is slidably disposed inside the valve body (1), and one end of the pressure relief push rod (7) abuts against the sealing ball (6); the valve body (1) is also provided with an adjustment module for controlling the working state of the pressure relief push rod (7).

2. The hydraulically controlled check valve according to claim 1, characterized in that, Along the axial direction of the connecting hole (3), the connecting hole (3) includes a threaded hole (301), an inner tapered hole (302), an adjusting hole (303), and a connecting hole (304) that pass through in sequence. The connecting nut (5) is threadedly connected to the threaded hole (301); the connecting hole (304) is connected to the pressure relief hole (2).

3. A hydraulically controlled check valve according to claim 1, characterized in that, The connecting nut (5) is also threaded with a threaded sleeve (8), which is threadedly connected to the high-pressure pipe (4); the connecting threads between the threaded sleeve (8) and the connecting nut (5) and the connecting threads between the threaded sleeve (8) and the high-pressure pipe (4) have opposite directions of rotation.

4. A hydraulically controlled check valve according to claim 2, characterized in that, A limiting step (9) is provided between the adjusting hole (303) and the communicating hole (304), and the sealing ball (6) is in close contact with the limiting step (9); a spherical groove (10) is also provided on the pressure relief push rod (7) and is in close contact with the outer surface of the sealing ball (6).

5. A hydraulically controlled check valve according to claim 2, characterized in that, Along the axis of the high-pressure pipe (4), an outer conical surface (11) is provided on one end face of the high-pressure pipe (4), and the outer conical surface (11) is in contact with the inner conical hole (302).

6. A hydraulically controlled check valve according to claim 1, characterized in that, The adjustment module includes a pressure relief piston (12) and a drive module. The valve body (1) is provided with an adjustment cavity (13) that communicates with the pressure relief hole (2). The pressure relief piston (12) is slidably disposed in the adjustment cavity (13). One end of the pressure relief piston (12) abuts against the pressure relief push rod (7), and the other end is poweredly connected to the drive module.

7. A hydraulically controlled check valve according to claim 6, characterized in that, The adjustment module also includes a disc spring (14). One end of the pressure relief piston (12) is provided with a thrust surface (15). The disc spring (14) is sleeved on the pressure relief piston (12). Along the axial direction of the adjustment cavity (13), one end of the disc spring (14) abuts against the inner end face of the adjustment cavity (13), and the other end abuts against the thrust surface (15).

8. A hydraulically controlled check valve according to claim 6, characterized in that, The drive module includes a pressure relief connector (16), which is threadedly connected to one end of the regulating cavity (13); the pressure relief connector (16) is provided with an oil supply hole (17) communicating with the regulating cavity (13).

9. A hydraulically controlled check valve according to claim 6, characterized in that, The pressure relief piston (12) is provided with a first sealing groove (18) at the end opposite to the pressure relief connector (16). A first sealing ring (19) is fitted inside the first sealing groove (18). A compression chamber (20) is provided on the end face of the first sealing ring (19) opposite to the pressure relief connector (16). The compression chamber (20) has an annular structure and extends along the axial direction of the first sealing ring.

10. A hydraulically controlled check valve according to claim 8, characterized in that, The pressure relief connector (16) is also provided with a second sealing groove (21), and a second sealing ring (22) is embedded in the second sealing groove (21).

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