Constant-value pressure valve

Abstract

The utility model provides a constant-value pressure valve which comprises a valve body and a valve seat which are split, a blind hole is formed in the valve body, and a stepped through hole is formed in the valve seat. A spring seat extending along the axis and a spring sleeved on the spring seat are arranged in the blind hole of the valve body; a stepped through hole is formed in the valve seat, an oil inlet and an oil outlet which are communicated with the stepped through hole are formed in the valve seat, a cone valve element extending along the axis is arranged in the stepped through hole of the valve seat, and the cone valve element can axially move in the stepped through hole of the valve seat. According to the constant-value pressure valve, the valve body and the valve seat are designed in a split mode, the machining process is simpler, installation, assembly, disassembly and maintenance are more convenient, and in the using process, the set pressure value of the constant-value pressure valve can be conveniently changed by increasing or decreasing the adjusting gaskets through the split structure.

Description

Technical Field

[0001] The utility model belongs to the technical field of hydraulic control valves, in particular to a fixed-value pressure valve. Background Art

[0002] Hydraulic transmission is a transmission method that uses liquid as the working medium to exchange, transfer and control energy. It has become an irreplaceable and important basic technology in the process of modernization of industry, agriculture, national defense and science and technology.

[0003] Hydraulic systems are usually composed of two parts: hydraulic components (including energy components, actuators, hydraulic control components, auxiliary components) and working media. Hydraulic control components have many specifications, wide application and flexibility. Through different combinations of hydraulic valves, various types of hydraulic systems can be formed. Hydraulic valves play an important role in hydraulic systems.

[0004] Overflow valves are widely used in hydraulic systems and are usually used as constant pressure valves. Their function is to allow excess fluid in the system to overflow, thereby maintaining its inlet pressure approximately constant. Figure 1 It is a structural schematic diagram of a common constant pressure valve in the oil supply system of a transmission device. The valve consists of a valve core 04, a valve sleeve 02 and a spring 01. The constant pressure valve is in a closed state when not working. Oil flows in from the oil inlet 05 of the constant pressure valve, and the oil flows through the damping hole 06 to act on the right end acting surface of the valve core 04. When the pressure at the inlet of the constant pressure valve is low, the pressure acting on the right end acting surface of the valve core 04 is less than the preload force of the constant pressure valve spring 01, and the constant pressure valve is still in a closed state. When the inlet pressure rises and the pressure on the right end acting surface of the valve core 04 is greater than the preload force of the spring 01, the constant pressure valve opens to achieve overflow, and the oil flows out from the oil outlet 03. When the constant pressure valve reaches stability, the force on the right end surface of the valve core is balanced with the spring force of the spring 01, and the inlet pressure of the constant pressure valve is constant.

[0005] However, the structure of the above-mentioned constant pressure valve requires high processing accuracy of each component, and is inconvenient to install, disassemble and repair. After the constant pressure valve is installed, it is locked using a nut or other mechanism, so the preload force of the spring cannot be adjusted during use, and the set pressure value of the constant pressure valve cannot be adjusted. Utility Model Content

[0006] In view of the deficiencies in the prior art, the utility model aims to provide a constant pressure valve with an improved structure.

[0007] To achieve the above purpose, the solution adopted by the utility model is as follows:

[0008] The utility model provides a fixed-value pressure valve, comprising a split valve body and a valve seat, wherein a blind hole is arranged in the valve body, and a stepped through hole is arranged in the valve seat, the opening direction of the blind hole faces the stepped through hole, and the axis of the blind hole coincides with the axis of the stepped through hole; a spring seat extending along the axis and a spring sleeved on the spring seat are arranged in the blind hole of the valve body; an oil inlet and an oil outlet communicated with the stepped through hole are arranged on the valve seat, a cone valve core extending along the axis is arranged in the stepped through hole of the valve seat, a step surface is arranged at the proximal end of the cone valve core, one end of the spring abuts against the step surface, a certain distance is provided between the proximal end surface of the cone valve core and the spring seat, and the cone valve core can move axially in the stepped through hole of the valve seat.

[0009] Preferably, the spring seat comprises a spring seat body and a spring seat end surface located at one end of the spring seat body, and the other end of the spring abuts against the spring seat end surface.

[0010] Preferably, an adjusting gasket is provided between the other end of the spring and the end surface of the spring seat, and the elastic force of the spring is adjusted by increasing or decreasing the number of the adjusting gaskets, thereby adjusting the set pressure value of the set pressure valve.

[0011] Preferably, the diameter of the proximal through hole of the stepped through hole of the valve seat close to the blind hole is larger than the diameter of the distal through hole away from the blind hole, and a guide portion is provided at the distal end of the conical valve core, and the outer diameter of the guide portion is similar to the inner diameter of the lower through hole of the valve seat. The gap between the guide portion and the inner wall of the distal through hole of the valve seat has a damping effect on the hydraulic oil in the oil path from the oil inlet to the oil outlet, thereby controlling the switching speed of the oil inlet and the oil outlet.

[0012] Preferably, the position between the proximal through hole and the distal through hole of the valve seat is a sealing port for hydraulic oil, the conical valve core is provided with a conical portion at the sealing port, and the sealing port is located at the maximum diameter of the conical portion.

[0013] Preferably, at the position of the proximal through hole of the valve seat, a protruding fixing portion is provided on the outside of the valve seat for fixing the constant pressure valve, and a sealing gasket is provided on the distal end surface of the fixing portion.

[0014] Preferably, a steel ball is interference-disposed at the distal end of the stepped through hole of the valve seat to seal the stepped through hole of the valve seat.

[0015] Preferably, the distal end face of the valve body is a horizontal end face, and the proximal end face of the valve seat is an inclined end face that forms an acute angle with the horizontal end face of the bottom of the valve body. A sealing ring is pressed between the horizontal end face of the valve body and the inclined end face of the valve seat to prevent hydraulic oil from leaking from between the valve body and the valve seat.

[0016] Beneficial Effects

[0017] The utility model provides a set-value pressure valve, in which the valve body and the valve seat are of split design, the processing technology is simpler, and it is more convenient to install, assemble, disassemble and repair. During use, the split structure is convenient to change the set pressure value of the set-value pressure valve by adding or removing adjusting gaskets. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of a common constant pressure valve in the oil supply system of the transmission device mentioned in the background technology of the present utility model.

[0019] Figure 2 This is an assembly cross-sectional view of the fixed-value pressure valve involved in the utility model.

[0020] Figure 3 It is a cross-sectional view of the cone valve core of the fixed pressure valve involved in the utility model.

[0021] Figure 4 It is a cross-sectional view of the valve seat of the fixed pressure valve involved in the utility model.

[0022] Figure 5 This is a functional symbol diagram of the fixed pressure valve involved in the utility model. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Generally, the components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0024] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the present invention to be protected, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0026] In the description of the present utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the utility model product is usually placed when in use, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0027] In addition, the terms "horizontal", "vertical" and the like do not mean that the components are required to be absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0028] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0029] To this end, the following solutions are proposed:

[0030] See also Figure 2-5 The utility model provides a fixed-value pressure valve, comprising a split valve body 1 and a valve seat 2, wherein a blind hole 11 is provided in the valve body 1, and a stepped through hole 21 is provided in the valve seat 2, wherein the opening direction of the blind hole 11 faces the stepped through hole 21, and the axis of the blind hole 11 coincides with the axis of the stepped through hole 21; a spring seat 3 extending along the axis and a spring 4 sleeved on the spring seat 3 are provided in the blind hole 11 of the valve body 1; and an oil inlet P and an oil outlet T communicated with the stepped through hole 21 are provided on the valve seat 2.

[0031] As an embodiment of the utility model, a conical valve core 5 extending along the axis is arranged in the stepped through hole 21 of the valve seat 2, and a step surface 51 is provided at the proximal end of the conical valve core 5. One end of the spring 4 abuts against the step surface 51. There is a certain distance between the proximal end surface of the conical valve core 5 and the spring seat 3. The conical valve core 5 can move axially in the stepped through hole 21 of the valve seat 2, and the distance between the proximal end surface of the conical valve core 5 and the spring seat 3 should be greater than the stroke of the axial movement of the conical valve core 5 in the stepped through hole 21 of the valve seat 2.

[0032] As an embodiment of the present utility model, the spring seat 3 includes a spring seat body 31 and a spring seat end face 32 located at one end of the spring seat body 31, and the spring 4 is sleeved on the spring seat body 31, and the other end thereof abuts against the spring seat end face 32. In some embodiments, an adjustment gasket 6 is provided between the other end of the spring 4 and the spring seat end face 32, and the preload force of the spring 3 can be adjusted by increasing or decreasing the number or thickness of the adjustment gasket 6.

[0033] As an embodiment of the utility model, the stepped through hole 21 in the valve seat 2 includes a proximal through hole 21a close to the blind hole 11 and a distal through hole 21b away from the blind hole 11, wherein the diameter of the proximal through hole 21a is greater than the diameter of the distal through hole 21b, and a guide portion 52 is provided at the distal end of the cone valve core 5, the outer diameter of the guide portion 52 is similar to the inner diameter of the lower through hole 21b of the valve seat 2, and is used to guide the cone valve core 5 during axial movement, and a small gap is formed between the guide portion 52 and the inner wall of the distal through hole 21b of the valve seat 2. In some embodiments, the position between the proximal through hole 21a and the distal through hole 21b of the valve seat 2 is a sealing port 21c of the hydraulic oil, and the cone valve core 5 is provided with a tapered portion 53 at the sealing port 21c, and the sealing port 21c is located at the maximum diameter of the tapered portion 53 to plug the sealing port 21c of the hydraulic oil.

[0034] In the fixed-value pressure valve provided by the utility model, the fixed-value pressure valve is in a closed state when not working, and the hydraulic oil flows in from the oil inlet P located on the valve seat 2, and the hydraulic oil flows through the gap formed between the guide portion 52 of the cone valve core 5 and the inner wall of the distal through hole 21b of the valve seat 2. The gap has a damping effect on the hydraulic oil flowing through. After the hydraulic oil flows through the gap, it acts on the lower end surface of the cone valve core 5. When the pressure at the oil inlet P of the fixed-value pressure valve of the utility model is low, the force acting on the distal end surface of the cone valve core 5 is less than the preload force of the spring 4 and is insufficient to compress the spring 4. , the cone valve core 5 is in a stationary state, and the set pressure valve is still in a closed state. With the increase of the pressure at the oil inlet P, when the force acting on the distal end face of the cone valve core 5 is greater than the preload force of the spring 4, the cone valve core 5 is pushed to move in the direction of the spring 4, and the conical portion 53 of the cone valve core 5 opens the sealing port 21c, the set pressure valve is opened, and the hydraulic oil quickly flows through the sealing port 21c and finally flows out of the oil outlet T back to the oil tank. When the set pressure valve reaches stability, the force acting on the lower end face of the cone valve core 5 is balanced with the spring force of the spring 4. At this time, the inlet pressure of the set pressure valve is constant.

[0035] In the fixed-value pressure valve provided by the utility model, the size of the gap formed between the guide portion 52 of the cone valve core 5 and the inner wall of the lower through hole 21b of the valve seat 2 can control the switching speed of the oil inlet P and the oil outlet T to a certain extent. The smaller the gap, the greater the damping effect of the hydraulic oil flowing through the gap after flowing in from the oil inlet P located on the valve seat 2, and the slower the fixed-value pressure valve opens; conversely, the larger the gap, the smaller the damping effect of the hydraulic oil flowing through the gap after flowing in from the oil inlet P located on the valve seat 2, and the faster the fixed-value pressure valve opens.

[0036] In the set pressure valve provided by the utility model, the preload force of the spring 4 can be adjusted by increasing or decreasing the number or thickness of the adjusting gasket 6 arranged between the other end of the spring 4 and the spring seat end face 32, thereby adjusting the force of the hydraulic oil pushing the cone valve core 5 to move in the direction of the spring 4, that is, adjusting the set pressure value required by the set pressure valve of the utility model.

[0037] In the set pressure valve provided by the utility model, when the pressure value of the oil inlet P does not reach the required value, the valve body 1 can be removed, and the number or thickness of the adjusting gaskets 6 can be increased between the spring 4 and the spring seat end face 32, so as to increase the set pressure value; when the pressure value of the oil inlet P is too large, the valve body 1 can be removed, and the number or thickness of the adjusting gaskets 6 can be reduced between the spring 4 and the spring seat end face 32, so as to lower the set pressure value.

[0038] As an embodiment of the utility model, the distal end face of the valve body 1 is a horizontal end face, and the proximal end face of the valve seat 2 is an inclined end face that forms an acute angle with the horizontal end face of the distal end of the valve body 1. A sealing ring 7 is pressed between the horizontal end face of the valve body 1 and the inclined end face of the valve seat 2 to prevent hydraulic oil from leaking from between the valve body 1 and the valve seat 2.

[0039] In some embodiments, at the position of the proximal through hole 21a of the valve seat 2, a protruding fixing portion 22 is provided on the outside of the valve seat 2 for fixing the constant pressure valve of the utility model, and a sealing gasket 8 is provided on the distal end surface 221 of the fixing portion 22. In some embodiments, the sealing gasket 8 separates the oil inlet P and the oil outlet T on the valve seat 2.

[0040] As an implementation mode of the utility model, a steel ball 9 is provided at the bottom end of the stepped through hole 21 of the valve seat 2 to block the stepped through hole 21 of the valve seat 2. A check valve can also be installed at this position so that the oil inlet P and the oil outlet T can be opened quickly.

[0041] The processing and installation process of the fixed pressure valve of the utility model is as follows:

[0042] (1) A blind hole of the valve body 1 and a stepped through hole of the valve seat 2 are machined, a spring seat 3, a spring 4 and an adjusting gasket 6 are placed in the blind hole of the valve body 1, and a cone valve core 5 is placed in the stepped through hole of the valve seat 2;

[0043] (2) Then, first press the valve body 1 against the valve seat 2, and press the spring 4 in the valve body 1 against the cone valve core 5 in the valve seat 2, so that the spring 4 is in a compressed state. At the same time, press the valve seat 2 against the sealing gasket 8, and insert the sealing ring 7 at the connection between the valve body 1 and the valve seat 2. The installation and fixation of the constant pressure valve is completed.

[0044] The utility model provides a set-value pressure valve, in which the valve body and the valve seat are of split design, the processing technology is simpler, and it is more convenient to install, assemble, disassemble and repair. During use, the split structure is convenient to change the set pressure value of the set-value pressure valve by adding or removing adjusting gaskets.

[0045] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A fixed pressure valve, characterized in that: It comprises a split valve body and a valve seat, wherein a blind hole is arranged in the valve body, and a stepped through hole is arranged in the valve seat, the opening direction of the blind hole faces the stepped through hole, and the axis of the blind hole coincides with the axis of the stepped through hole; a spring seat extending along the axis and a spring sleeved on the spring seat are arranged in the blind hole of the valve body; an oil inlet and an oil outlet connected with the stepped through hole are arranged on the valve seat, a cone valve core extending along the axis is arranged in the stepped through hole of the valve seat, a step surface is arranged at the proximal end of the cone valve core, one end of the spring abuts against the step surface, a certain distance is provided between the proximal end surface of the cone valve core and the spring seat, and the cone valve core can move axially in the stepped through hole of the valve seat.

2. The constant pressure valve according to claim 1, characterized in that: The spring seat comprises a spring seat body and a spring seat end surface located at one end of the spring seat body, and the other end of the spring abuts against the spring seat end surface.

3. The constant pressure valve according to claim 2, characterized in that: An adjusting gasket is provided between the other end of the spring and the end surface of the spring seat. The elastic force of the spring is adjusted by increasing or decreasing the number of the adjusting gaskets, thereby adjusting the set pressure value of the set pressure valve.

4. The constant pressure valve according to claim 1, characterized in that: The diameter of the proximal through hole of the stepped through hole of the valve seat close to the blind hole is larger than the diameter of the distal through hole away from the blind hole. A guide portion is provided at the distal end of the conical valve core. The outer diameter of the guide portion is similar to the inner diameter of the distal through hole of the valve seat. The gap between the guide portion and the inner wall of the distal through hole of the valve seat has a damping effect on the hydraulic oil in the oil path from the oil inlet to the oil outlet, thereby controlling the switching speed of the oil inlet and the oil outlet.

5. The constant pressure valve according to claim 4, characterized in that: The position between the proximal through hole and the distal through hole of the valve seat is a sealing port for hydraulic oil, and the cone valve core is provided with a conical portion at the sealing port, and the sealing port is located at the maximum diameter of the conical portion.

6. The constant pressure valve according to claim 5, characterized in that: At the position of the proximal through hole of the valve seat, a protruding fixing portion is provided on the outside of the valve seat for fixing the constant pressure valve, and a sealing gasket is provided on the distal end surface of the fixing portion.

7. The constant pressure valve according to claim 1, characterized in that: A steel ball is interference-arranged at the distal end of the stepped through hole of the valve seat to seal the stepped through hole of the valve seat.

8. The constant pressure valve according to claim 1, characterized in that: The distal end face of the valve body is a horizontal end face, and the proximal end face of the valve seat is an inclined end face that forms an acute angle with the horizontal end face of the distal end of the valve body. A sealing ring is pressed between the horizontal end face of the valve body and the inclined end face of the valve seat to prevent hydraulic oil from leaking from between the valve body and the valve seat.

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