Overflow valve and hydraulic system
By setting movable pistons and control ports in the overflow valve, the overflow pressure can be adjusted, which solves the problem of unadjustable pressure of the existing overflow valve. It is suitable for logic control and load-related occasions, enhancing the safety protection of the system ability.
Patent Information
- Application Number
- CN202323577528.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2023-12-26
- Publication Date
- 2024-12-20
- Estimated Expiration
- 2033-12-26
AI Technical Summary
Most existing relief valves do not have pressure adjustable function, especially when the relief pressure is related to a certain pressure in the system, logic control cannot be achieved.
An overflow valve including a housing, a valve core, a piston and an elastic member is designed, and by providing a movable piston, an X-port and an L-port in the second chamber, respectively, is used to control the piston position and the elastic force of the elastic member, thereby Achieve adjustable overflow pressure.
The pressure of the overflow valve is adjustable through a simple structure, which is suitable for occasions where the overflow pressure is adjustable or load-related. The control pressure is introduced to achieve logical control, which enhances the safety protection function of the system.
Smart Images
Figure CN222208448U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of hydraulic components, in particular to a relief valve and a hydraulic system. Background Art
[0002] The relief valve is a hydraulic pressure control valve, which is generally used in situations where the hydraulic system requires safety protection. In hydraulic equipment, it mainly plays the role of constant pressure relief, pressure stabilization, system unloading and safety protection.
[0003] When the pressure reaches the overflow pressure, the overflow valve opens and works, but most of them do not have the pressure adjustable function, especially when the overflow pressure is related to a certain pressure in the system, logical control cannot be achieved. Utility Model Content
[0004] In view of the deficiencies in the prior art, the purpose of the embodiments of the utility model is to provide a relief valve with adjustable relief pressure, which can be positively controlled or negatively controlled, and can be used in situations where the relief pressure is adjustable or the relief pressure is related to the load.
[0005] In order to achieve the above purpose, the embodiment of the utility model provides the following technical solutions:
[0006] A relief valve comprises: a shell, a valve core, a piston and an elastic member; the shell has a cavity inside, the valve core is arranged in the cavity and divides the cavity into a first chamber and a second chamber, the end of the first chamber is provided with a P port, the side of the first chamber is provided with a T port, the end of the second chamber is provided with an X port, and the side of the second chamber is provided with an L port; the piston is movably arranged in the second chamber, the elastic member is arranged between the piston and the valve core, the elastic member can make the valve core cut off the conduction between the P port and the T port, and the X port and the L port can control the position of the piston in the second chamber.
[0007] Optionally, the outer shell includes a valve sleeve, a joint is provided at one end of the valve sleeve, a valve seat is provided at the other end of the valve sleeve, the valve sleeve, the joint and the valve seat surround the second chamber, a throttling plug is provided in the joint, an oil channel is provided on the throttling plug, the oil channel is connected with the second chamber to form an X port, and the L port is provided on the wall of the valve sleeve.
[0008] Optionally, a spring seat is provided in the valve sleeve, the valve core rests on the spring seat, the inner hole of the valve sleeve is a step hole, an annular groove is provided on the side of the piston facing the elastic member, the elastic member includes an inner spring and an outer spring, one end of the inner spring rests on the spring seat, and the other end rests in the annular groove of the piston, one end of the outer spring rests on the step of the step hole, and the other end rests in the annular groove of the piston.
[0009] Optionally, a gasket is provided at the bottom of the annular groove, and the inner spring and the outer spring both abut against the gasket.
[0010] Optionally, a first O-ring is provided at the joint between the valve sleeve and the joint, and a second O-ring is provided at the connection between the valve sleeve and the valve seat.
[0011] Optionally, the valve sleeve is a split structure, the valve sleeve includes a sleeve and an intermediate ring, the sleeve is connected to the joint, the first O-ring is arranged at the connection between the sleeve and the joint, the intermediate ring abuts the valve seat, and the second O-ring is arranged at the abutment between the intermediate ring and the valve seat.
[0012] Optionally, a conical seat is provided on the side of the valve seat away from the valve sleeve, the P port is provided at the end of the conical seat, the T port is provided on the side of the valve seat, the valve seat is provided with a center hole, and the valve core is movably installed in the center hole of the valve seat.
[0013] Optionally, the valve core includes a valve stem and a valve head, the end of the valve stem away from the valve head is spherical, a tapered hole is provided on the spring seat, and the spherical end of the valve stem abuts against the tapered hole of the spring seat.
[0014] Optionally, one end of the valve head away from the valve stem is conical, and the conical valve head abuts against the P port of the conical seat.
[0015] The embodiment of the utility model further provides a hydraulic system, comprising an overflow pipeline, wherein the overflow pipeline is provided with the overflow valve as described above.
[0016] One or more technical solutions provided in the embodiments of the present utility model have at least the following technical effects or advantages:
[0017] The overflow valve of the utility model is provided with a second chamber, a movable piston is provided in the second chamber, and the second chamber is provided with an X port and an L port, control oil is introduced into the X port and the L port, and acts on both sides of the piston respectively. The L port is a negative control port, and the pressure at the L port increases, pushing the piston to move upward, and the elastic force of the elastic member decreases, so that the overflow pressure is smaller; the X port is a positive control port, and the pressure at the X port increases, pushing the piston to move downward, and the elastic force of the elastic member increases, so that the overflow pressure is larger. Therefore, the overflow valve of the utility model can adjust the position of the piston in the second chamber by providing the piston and two control ends of the L port and the X port, and then adjust the elastic force of the elastic member to achieve adjustable overflow pressure. The pressure of the overflow valve can be adjusted by a simple structure, and the control pressure can be introduced to achieve logical control, which is suitable for occasions where the overflow pressure is adjustable or the overflow pressure is related to the load.
[0018] Additional advantages of the present invention will be given in the following description, and some will become apparent from the following description or will be understood through the practice of the present invention.
[0019] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.
[0021] Figure 1 It is a schematic diagram of a relief valve provided by an embodiment of the utility model;
[0022] In the figure: 1, joint; 2, first O-ring; 3, throttle plug; 4, piston; 5, sleeve; 6, gasket; 7, outer spring; 8, inner spring; 9, spring seat; 10, intermediate ring; 11, second O-ring; 12, valve seat; 13, valve core; 14, cone seat; 15, first chamber; 16, second chamber; 17, oil channel;
[0023] In order to show the positions of various parts, the distances or sizes between them are exaggerated and the schematic diagram is for reference only. DETAILED DESCRIPTION
[0024] It should be noted that the following detailed descriptions are illustrative and are intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used in the present invention have the same meanings as those commonly understood by those of ordinary skill in the art to which the present invention belongs. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.
[0025] The relief valve in hydraulic equipment mainly plays the role of constant pressure relief, pressure stabilization, system unloading and safety protection:
[0026] Constant pressure overflow function: In the metering pump throttling regulation system, the metering pump provides a constant flow. When the system pressure increases, the flow demand will decrease. At this time, the overflow valve opens to allow the excess flow to overflow back to the oil tank, ensuring that the overflow valve inlet pressure, that is, the pump outlet pressure is constant (the valve port is often opened with pressure fluctuations).
[0027] Pressure stabilizing effect: The overflow valve is connected in series on the oil return line. The overflow valve generates back pressure and the stability of moving parts is increased.
[0028] System unloading function: A small-flow solenoid valve is connected in series to the remote control port of the relief valve. When the electromagnet is energized, the remote control port of the relief valve is connected to the oil tank, and the hydraulic pump is unloaded. The relief valve is used as an unloading valve.
[0029] Safety protection function: When the system is working normally, the valve is closed. Only when the load exceeds the specified limit (the system pressure exceeds the set pressure), the overflow is opened for overload protection, so that the system pressure will no longer increase (usually the set pressure of the overflow valve is 10% to 20% higher than the maximum working pressure of the system).
[0030] In practical applications, it is generally used as an unloading valve, a remote pressure regulating valve, a high and low pressure multi-stage control valve, and a sequence valve to generate back pressure (connected in series on the oil return line). However, most of the existing relief valves do not have the pressure adjustment function, especially when the relief pressure is related to a certain pressure in the system, logical control cannot be achieved. In order to solve the above technical problems, the utility model proposes a relief valve with adjustable relief pressure, which can be positively controlled or negatively controlled. It is often used in situations where the relief pressure is adjustable or the relief pressure is related to the load.
[0031] like Figure 1 As shown, in one embodiment of the utility model, a relief valve is proposed, comprising: a housing, a valve core 13, a piston 4 and an elastic member; the housing has a cavity inside, the valve core 13 is arranged in the cavity and divides the cavity into a first chamber 15 and a second chamber 16, as shown in FIG. Figure 1 As shown, the first chamber 15 is located at the lower side, and the second chamber 16 is located at the upper side. The lower end of the first chamber 15 is provided with a P port, the side of the first chamber 15 is provided with a T port, the upper end of the second chamber 16 is provided with an X port, and the side of the second chamber 16 is provided with an L port. It should be noted that the words "upper" and "lower" only indicate that they are consistent with the upper and lower directions of the drawings themselves, and do not limit the structure. They are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the equipment or components referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the utility model.
[0032] The piston 4 is movably arranged in the second chamber 16 on the upper side, and the elastic member is arranged between the piston 4 and the valve core 13. The elastic member can make the valve core 13 cut off the conduction of the P port and the T port, and the X port and the L port can control the position of the piston 4 in the second chamber 16.
[0033] The overflow function of the overflow valve is as follows: in the first chamber 15, the P port is a high-pressure port. When the force acting on the P port is greater than the force acting on the elastic member, the valve core 13 overcomes the elastic force of the elastic member and moves upward, and the P port and the T port are connected to unload to the low-pressure T port.
[0034] The relief valve of the utility model is provided with a second chamber 16, in which a movable piston 4 is provided, and at the same time, an X port and an L port are provided in the second chamber 16, and control oil is introduced into the X port and the L port, and acts on both sides of the piston 4 respectively. The L port is a negative control port, and the pressure at the L port increases, pushing the piston 4 to move upward, and the elastic force of the elastic member decreases, so that the relief pressure is smaller; the X port is a positive control port, and the pressure at the X port increases, pushing the piston 4 to move downward, and the elastic force of the elastic member increases, so that the relief pressure is larger. Therefore, the relief valve of the utility model can adjust the position of the piston 4 in the second chamber 16 by providing the piston 4 and two control ends of the L port and the X port, and then adjust the elastic force of the elastic member to achieve adjustable relief pressure. The pressure of the relief valve can be adjusted by a simple structure, and the control pressure can be introduced to achieve logical control, which is suitable for occasions where the relief pressure is adjustable or the relief pressure is related to the load.
[0035] like Figure 1 As shown, the housing includes a valve sleeve, a joint 1 is provided at the upper end of the valve sleeve, a valve seat 12 is provided at the lower end of the valve sleeve, the valve sleeve, the joint 1 and the valve seat 12 surround the second chamber 16, a throttle plug 3 is provided in the joint 1, an oil passage 17 is provided on the throttle plug 3, the oil passage 17 is connected with the second chamber 16 to form an X port, and the L port is provided on the wall of the valve sleeve. Since the external control pressure will fluctuate, the utility model eliminates the external control pressure fluctuation by providing the throttle plug 3 and providing an elongated oil passage 17 on the throttle plug 3, and prevents the problem of unstable overflow pressure caused by the external control pressure fluctuation.
[0036] A spring seat 9 is provided in the valve sleeve, the valve core 13 abuts against the spring seat 9, the inner hole of the valve sleeve is a stepped hole, an annular groove is provided on the lower side of the piston 4, the elastic member includes an inner spring 8 and an outer spring 7, the diameter of the inner spring 8 is smaller than the diameter of the outer spring 7, the outer spring 7 is sleeved on the outer side of the inner spring 8, the lower end of the inner spring 8 abuts against the spring seat 9, and the upper end abuts against the annular groove of the piston 4, the lower end of the outer spring 7 abuts against the step of the stepped hole, and the upper end abuts against the annular groove of the piston 4. By providing the inner spring 8 and the outer spring 7, the stiffness and spring force are increased within a limited length range, which facilitates the adjustment of the overflow pressure.
[0037] Further, a gasket 6 is provided at the bottom of the annular groove, and the inner spring 8 and the outer spring 7 are both against the gasket 6. The gasket 6 is an adjustment gasket 6, the thickness is optional, and the number is not limited, and can be 4 or other numbers.
[0038] A first O-ring 2 is provided at the valve sleeve and the joint 1 , and a second O-ring 11 is provided at the connection between the valve sleeve and the valve seat 12 . The first O-ring 2 and the second O-ring 11 are used to seal the second cavity.
[0039] The valve sleeve can be an integral structure or a split structure. When the valve sleeve is a split structure, it includes a sleeve 5 and an intermediate ring 10. Figure 1 As shown, the sleeve 5 is connected to the joint 1, the first O-ring 2 is arranged at the connection between the sleeve 5 and the joint 1, the intermediate ring 10 is in contact with the valve seat 12, and the second O-ring 11 is arranged at the contact between the intermediate ring 10 and the valve seat 12. By arranging the valve sleeve into a separate sleeve 5 and intermediate ring 10, the spring seat 9 and spring and other components can be removed without completely removing the piston 4, the joint 1 and other structures during disassembly, which facilitates the installation and disassembly of the spring seat 9 and the spring.
[0040] A conical seat 14 is provided on the side of the valve seat 12 away from the valve sleeve, the P port is provided at the end of the conical seat 14, the T port is provided at the side of the valve seat 12, the valve seat 12 is provided with a central hole, and the valve core 13 is movably installed in the central hole of the valve seat 12. The guide central hole of the conical valve core 13 is provided on the valve seat 12, which is conducive to controlling the stability of the conical valve core 13 during operation and is not easy to deviate.
[0041] Specifically, the valve core 13 includes a valve stem and a valve head, the end of the valve stem away from the valve head is spherical, the spring seat 9 is provided with a tapered hole, and the spherical end of the valve stem abuts on the tapered hole of the spring seat 9. The end of the valve head away from the valve stem is conical, and the conical valve head abuts on the P port of the conical seat 14.
[0042] Overflow function: The matching surfaces of the conical valve core 13 and the valve seat 12 are used for overflow sealing. The P port is a high-pressure port. When the force at the P port is greater than the spring force, the load is unloaded to the low-pressure T port. The L port is a negative control port. When the pressure at the L port increases, the piston 4 is pushed upward, and the spring force decreases, thereby the overflow pressure is smaller. The X port is a positive control port. When the pressure at the X port increases, the piston 4 is pushed downward, and the spring force increases, thereby the overflow pressure is greater.
[0043] Based on the above-mentioned overflow valve, an embodiment of the utility model further provides a hydraulic system, in which the overflow pipeline of the hydraulic system is provided with the overflow valve described in the above-mentioned embodiment. Since the above-mentioned overflow valve has the above-mentioned technical effect, the technical effect of the hydraulic system using the overflow valve please refer to the above-mentioned embodiment.
[0044] Although the above describes the specific implementation methods of the utility model in combination with the accompanying drawings, it is not intended to limit the scope of protection of the utility model. Technical personnel in the relevant field should understand that on the basis of the technical solution of the utility model, various modifications or deformations that can be made by technical personnel in this field without creative work are still within the scope of protection of the utility model.
Claims
1. A relief valve, It is characterized in that include: Housing, valve core, piston and elastic parts; The housing has a cavity inside, the valve core is arranged in the cavity and divides the cavity into a first chamber and a second chamber, the end of the first chamber is provided with a P port, the side of the first chamber is provided with a T port, the end of the second chamber is provided with an X port, and the side of the second chamber is provided with an L port; The piston is movably arranged in the second chamber, the elastic member is arranged between the piston and the valve core, the elastic member can make the valve core cut off the conduction of the P port and the T port, and the X port and the L port can control the position of the piston in the second chamber.
2. The relief valve according to claim 1, It is characterized in that The outer shell includes a valve sleeve, a joint is provided at one end of the valve sleeve, a valve seat is provided at the other end of the valve sleeve, the valve sleeve, the joint and the valve seat surround the second chamber, a throttling plug is provided in the joint, an oil channel is provided on the throttling plug, the oil channel is connected with the second chamber to form an X port, and the L port is provided on the wall of the valve sleeve.
3. The relief valve according to claim 2, It is characterized in that A spring seat is arranged in the valve sleeve, the valve core rests on the spring seat, the inner hole of the valve sleeve is a step hole, an annular groove is arranged on the side of the piston facing the elastic member, the elastic member comprises an inner spring and an outer spring, one end of the inner spring rests on the spring seat, and the other end rests in the annular groove of the piston, one end of the outer spring rests on the step of the step hole, and the other end rests in the annular groove of the piston.
4. The relief valve according to claim 3, It is characterized in that A gasket is arranged at the bottom of the annular groove, and both the inner spring and the outer spring abut against the gasket.
5. The relief valve according to claim 2, It is characterized in that A first O-ring is arranged at the joint between the valve sleeve and the joint, and a second O-ring is arranged at the connection between the valve sleeve and the valve seat.
6. The relief valve according to claim 5, It is characterized in that The valve sleeve is a split structure, and the valve sleeve includes a sleeve and an intermediate ring. The sleeve is connected to the joint, the first O-ring is arranged at the connection between the sleeve and the joint, the intermediate ring abuts the valve seat, and the second O-ring is arranged at the abutment between the intermediate ring and the valve seat.
7. The relief valve according to claim 3, It is characterized in that A conical seat is arranged on one side of the valve seat away from the valve sleeve, the P port is arranged at the end of the conical seat, the T port is arranged at the side of the valve seat, the valve seat is provided with a central hole, and the valve core is movably installed in the central hole of the valve seat.
8. The relief valve according to claim 7, It is characterized in that The valve core comprises a valve stem and a valve head, the end of the valve stem away from the valve head is spherical, a tapered hole is arranged on the spring seat, and the spherical end of the valve stem abuts against the tapered hole of the spring seat.
9. The relief valve according to claim 8, It is characterized in that One end of the valve head away from the valve stem is conical, and the conical valve head abuts against the P port of the conical seat.
10. A hydraulic system, It is characterized in that It comprises an overflow pipeline, on which is arranged an overflow valve as described in any one of claims 1 to 9.