Pressure relief valve

Abstract

The utility model discloses a pressure relief valve. The pressure relief valve comprises a first valve body and a second valve body, one end of the second valve body is connected with the first valve body, the other end of the second valve body is connected with the outside, the first valve body and the second valve body are connected to form a moving cavity, and an oil way switching part is arranged in the moving cavity; the first valve body is provided with a driving oil way, the driving oil way comprises a working oil way and a backflow oil way, and oil inlets of the working oil way and the backflow oil way face the second valve body; the oil way switching part is driven by air pressure to open the backflow oil way, and the oil way switching part is driven by external liquid to close the backflow oil way. The oil way switching part is arranged in the moving cavity formed by the first valve body and the second valve body, the oil way switching part is driven by air pressure, a backflow oil way is opened, the pressure of the oil way where the pressure relief valve is located is released, the pressure of an oil way system is adjusted, and the risk of accidents caused by too large air pressure of the oil way is reduced.

Description

Technical Field

[0001] The utility model relates to the field of pressure relief valves, in particular to a pressure relief valve. Background Art

[0002] A pressure relief valve is a device that uses a moving part to open, close or partially block one or more openings or channels to allow liquid flow, air flow or other air flow or a large amount of loose material to flow out, close or be regulated.

[0003] The lubrication pump intermittently supplies lubricating oil from the main channel to the oil outlet pipeline. When the lubrication pump is intermittently stopped, the lubricating oil in the pipeline will temporarily lose pressure. At this time, the air pressure in the oil channel is greater than the atmospheric pressure, and the oil channel may leak or explode due to excessive air pressure. Utility Model Content

[0004] The purpose of the present invention is to overcome the shortcomings of the existing technology. The present invention provides a pressure relief valve. By arranging a switching oil circuit part in a movable cavity formed by a first valve body and a second valve body, the switching oil circuit part is driven by air pressure to open the return oil circuit, release the pressure of the oil channel where the pressure relief valve is located, adjust the pressure of the oil channel system, and reduce the risk of accidents caused by excessive air pressure in the oil channel.

[0005] Accordingly, the present invention provides a pressure relief valve, which includes: a first valve body and a second valve body;

[0006] One end of the second valve body is connected to the first valve body, and the other end of the second valve body is connected to the outside. The first valve body and the second valve body are connected to form a moving cavity, and a switching oil circuit component is provided in the moving cavity;

[0007] The first valve body has a driving oil circuit, and the oil inlet of the driving oil circuit faces the second valve body;

[0008] The oil path switching component is driven by the air pressure to open the return oil path, and the oil path switching component is driven by external liquid to close the return oil path.

[0009] Preferably, the end surface of the first valve body close to the second valve body extends toward the second valve body to form a first boss.

[0010] Preferably, the oil inlet of the return oil circuit is located on the first boss, and the oil outlet of the return oil circuit is located on the side wall of the first valve body.

[0011] Preferably, the working oil circuit passes through the first valve body, and the oil inlet of the working oil circuit is located on the end surface of the first valve body close to the second valve body.

[0012] Preferably, the movable cavity comprises: a first sub-cavity and a second sub-cavity, wherein the inner wall of the first sub-cavity extends inwardly to form a clamping boss;

[0013] The cross-sectional area of ​​the first sub-cavity is S1, and the cross-sectional area of ​​the second sub-cavity is S2, satisfying the relationship: S1<S2.

[0014] Preferably, the oil switching circuit component includes: a neck portion and a tail portion, wherein the neck portion is located in the first sub-cavity, and the tail portion is located in the second sub-cavity;

[0015] The cross-sectional area of ​​the neck portion is S3, and the cross-sectional area of ​​the tail portion is S4, satisfying the relationship: S3<S1<S4<S2.

[0016] Preferably, the neck has a plurality of grooves, and the plurality of grooves are distributed in an array with the center of the neck as the center of a circle.

[0017] Preferably, the tail portion has a water shutoff fence, and the water shutoff fence extends toward the inner wall of the second valve body to form an inclined surface.

[0018] Preferably, the material of the oil circuit switching component is rubber.

[0019] Preferably, a sealing layer is provided at the connection between the first valve body and the second valve body, and the sealing layer is located between the first valve body and the second valve body.

[0020] Beneficial effects of the utility model:

[0021] The utility model provides a return oil circuit, which releases the pressure in the oil channel where the pressure relief valve is located when the internal air pressure of the oil circuit system is too high, regulates the pressure of the oil circuit system, and reduces the risk of accidents caused by excessive air pressure in the oil channel; the utility model also provides a switching oil circuit component, which is driven by the air pressure to open the return oil circuit, release the pressure in the oil channel where the pressure relief valve is located, regulates the pressure of the oil circuit system, and reduces the risk of accidents caused by excessive air pressure in the oil channel; and the switching oil circuit component is driven by external liquid to close the return oil circuit, so that the liquid can only flow from the working oil circuit, reducing the risk of oil flowing out from the working oil circuit and the return oil circuit at the same time, reducing the energy consumption of the system, and thus improving the efficiency of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0023] Figure 1 It is a structural diagram of the pressure relief valve in the utility model;

[0024] Figure 2 It is an exploded view of the pressure relief valve in the utility model;

[0025] Figure 3 It is a cross-sectional view of the pressure relief valve in the utility model;

[0026] Figure 4 It is a structural diagram of the oil circuit switching parts in the utility model.

[0027] In the accompanying drawings, 1. First valve body; 11. Drive oil circuit; 111. Working oil circuit; 112. Return oil circuit; 12. First boss; 2. Second valve body; 3. Moving chamber; 31. First sub-chamber; 32. Second sub-chamber; 4. Switching oil circuit parts; 41. Neck; 411. Groove; 42. Tail; 421. Water blocking fence; 5. Sealing layer. DETAILED DESCRIPTION

[0028] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0029] Figure 1 It shows the structural diagram of the pressure relief valve in the utility model. Figure 2 The exploded view of the pressure relief valve in the utility model is shown. Figure 3The cross-sectional view of the pressure relief valve in the present invention is shown, and the pressure relief valve includes: a first valve body and a second valve body; one end of the second valve body is connected to the first valve body, and the other end of the second valve body is connected to the outside, the first valve body and the second valve body are connected to form a moving chamber, and a switching oil circuit part is provided in the moving chamber; the first valve body has a driving oil circuit, and the driving oil circuit includes: a working oil circuit and a driving oil circuit, and the oil inlets of the working oil circuit and the driving oil circuit are both facing the second valve body; the switching oil circuit part is driven by the air pressure to open the return oil circuit, and the switching oil circuit part is driven by external liquid to close the return oil circuit. In this embodiment, the first valve body and the second valve body can be threadedly connected, wherein the first valve body is the oil outlet end and the second valve body is the oil inlet end, that is, the second valve body is connected to the external liquid, and the first valve body is connected to other components. The oil switching component is used to switch the oil flow within the drive oil circuit. This means that external fluid actuates the switching component to close the return oil flow, or it actuates the switching component under air pressure to open the return oil flow, releasing internal air pressure and excess fluid. The return oil flow is used to regulate the oil system pressure, while the working oil flow controls the flow of oil to the next component.

[0030] Furthermore, the end surface of the first valve body adjacent to the second valve body extends toward the second valve body to form a first boss. In this embodiment, the first boss is used to differentiate the oil inlets in the drive oil circuit, positioning different oil inlets at different heights. This prevents the oil circuit switching component from simultaneously closing multiple oil circuit inlets, preventing liquid from flowing from the drive oil circuit to the next component, thereby ensuring the normal operation of the entire oil circuit system.

[0031] Furthermore, the oil inlet of the return oil circuit is located on the first boss, and the oil outlet of the return oil circuit is located on the side wall of the first valve body. That is, the return oil circuit is a cornered oil circuit. The oil forms a vortex flow at the corner, which can reduce the flushing speed and thus reduce the wear on the inner wall of the pipeline. This helps to extend the service life of the return oil circuit and reduce maintenance and replacement costs. The return oil circuit is used to regulate the pressure of the oil circuit system. The pressure relief valve can protect the various components in the entire oil circuit system from damage caused by excessive pressure. When the system pressure is too high, the excess pressure is released through the return oil circuit, thereby reducing the risk of component damage or oil circuit system collapse.

[0032] Furthermore, the working oil circuit runs through the first valve body, and the oil inlet of the working oil circuit is located on the end face of the first valve body close to the second valve body, that is, the working oil circuit is a linear oil circuit, which reduces the number of times the liquid is transferred during the flow process, making the flow of liquid in the oil circuit system more controllable and reliable, thereby improving the stability and safety of the system.

[0033] Specifically, when liquid enters the movable chamber, the liquid that continues to enter the movable chamber exerts pressure on the switching oil circuit component, pushing the switching oil circuit component to move within the movable chamber toward the first valve body until the switching oil circuit component closes the oil inlet of the return oil circuit, closing the return oil circuit so that liquid can only flow to the oil inlet of the working oil circuit and enter the working oil circuit, thereby flowing to the next component. When the liquid supply is stopped, there is insufficient liquid to press the switching oil circuit component against the boss, and the air pressure in the working oil circuit increases. This air pressure exerts a force on the switching oil circuit component, causing it to move away from the first valve body, opening the return oil circuit, and preventing the switching oil circuit component from closing the return oil circuit. Excess liquid enters the return oil circuit under the influence of air pressure, and flows out from the side wall of the first valve body through the return oil circuit to relieve pressure, thereby reducing the internal air pressure of the pressure relief valve to a preset range, avoiding damage to the pressure relief valve caused by excessive pressure inside the pressure relief valve, and helping to maintain the stability and performance of the oil circuit system.

[0034] Furthermore, the movable chamber includes a first sub-chamber and a second sub-chamber, wherein the inner wall of the first sub-chamber extends inward to form a latching boss. The cross-sectional area of ​​the first sub-chamber is S1, and the cross-sectional area of ​​the second sub-chamber is S2, satisfying the relationship: S1 < S2. The latching boss is used to limit the range of movement of the oil switching component, preventing the oil switching component from moving too far, which would prevent the oil switching component from moving to the corresponding position to close the return oil circuit, causing liquid to flow out of both the working oil circuit and the return oil circuit simultaneously, resulting in unstable pressure control of the entire system and affecting normal system and equipment operation. This facilitates the oil switching component to move to the corresponding position, reducing the risk of simultaneous oil flow from both circuits, reducing system energy consumption, and thus improving system efficiency. When liquid enters the second sub-chamber from the first sub-chamber, that is, from the cavity with a smaller radius to the cavity with a larger radius, the liquid pressure increases, pushing the oil switching component backward, thereby closing one of the return oil circuits, reducing the risk of simultaneous oil flow from both circuits, reducing system energy consumption, and thus improving system efficiency.

[0035] Furthermore, the oil circuit switching component includes a neck and a tail, with the neck located within the first sub-cavity and the tail located within the second sub-cavity. The cross-sectional area of ​​the neck is S3, and the cross-sectional area of ​​the tail is S4, satisfying the relationship: S3 < S1 < S4 < S2. In this embodiment, the radius of the tail is greater than the radius of the first sub-cavity, meaning that the tail cannot enter the first sub-cavity, preventing the tail from entering the first sub-cavity. This ensures that the tail moves along the inner wall of the second sub-cavity, facilitating the restriction of movement and ensuring that the tail can move to a corresponding position to close the return oil circuit. Furthermore, the neck is located within the first sub-cavity and can move along the inner wall of the first sub-cavity, reducing the risk of the neck shifting during operation. This helps ensure that the tail can move to a corresponding position to close the return oil circuit, allowing liquid to flow only through the working oil circuit. This helps reduce the risk of simultaneous outflow from both oil circuits, reducing system energy consumption, and thus improving system efficiency.

[0036] Furthermore, the neck has a plurality of grooves, which are arranged in an array with the center of the neck as the center of the circle. In this embodiment, the neck has four grooves, which are arranged in an array with the center of the neck as the center of the circle, so that the liquid can flow through the grooves, that is, the liquid can flow from the first sub-cavity to the second sub-cavity, and sufficient pressure pushes the switching oil circuit component toward the first valve body and closes the oil inlet of the return oil circuit, so that the liquid can only flow through the working oil circuit, which helps to reduce the risk of simultaneous outflow from two oil circuits, reduce system energy consumption, and thus improve system efficiency.

[0037] Furthermore, the tail portion includes a water shutoff fence that extends toward the inner wall of the second valve body to form an inclined surface. The water shutoff fence is used to restrict liquid from flowing from the second sub-cavity into the first sub-cavity. The inclined surface formed by the water shutoff fence increases the contact area between the oil circuit switching component and the inner wall of the second valve body, ensuring that the oil circuit switching component maintains contact, thereby providing a better sealing effect.

[0038] Furthermore, the switching oil circuit components are made of rubber. Rubber has excellent elasticity and deformability, allowing it to fit snugly into holes or pipes of various shapes and sizes, providing excellent sealing performance. This helps prevent the leakage of liquids, gases, or other substances, ensuring system integrity and safety. Rubber also offers high durability and wear resistance, and can withstand certain pressures and friction, preventing damage to the switching oil circuit components during use. This helps maintain the sealing performance over time and extends their service life.

[0039] Furthermore, a sealing layer is provided at the connection between the first valve body and the second valve body, and the sealing layer is located between the first valve body and the second valve body. The sealing layer is used to seal the connection between the first valve body and the second valve body to prevent liquid from leaking from the connection between the first valve body and the second valve body during operation, which is conducive to ensuring the normal operation of the pipeline; secondly, the sealing layer has the function of adhesion up and down, so that the first valve body and the second valve body can be tightly connected, thereby reducing the risk of leakage due to increased stress or contraction strain of the first valve body or the second valve body.

[0040] To sum up, the utility model provides a return oil circuit, which releases the pressure in the oil channel where the pressure relief valve is located when the internal air pressure of the oil circuit system is too high, regulates the pressure of the oil circuit system, and reduces the risk of accidents due to excessive air pressure in the oil channel; the utility model also provides a switching oil circuit component, which is driven by air pressure to open the return oil circuit, release the pressure in the oil channel where the pressure relief valve is located, regulates the pressure of the oil circuit system, and reduces the risk of accidents due to excessive air pressure in the oil channel; and the switching oil circuit component is driven by external liquid to close the return oil circuit, so that the liquid can only flow from the working oil circuit, reducing the risk of simultaneous outflow from the working oil circuit and the return oil circuit, reducing the energy consumption of the system, and thus improving the system efficiency.

[0041] In addition, the above is a detailed introduction to a pressure relief valve provided in an embodiment of the present invention. Specific examples are used herein to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method and core idea of ​​the present invention. At the same time, for general technical personnel in this field, based on the idea of ​​the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as a limitation on the present invention.

Claims

1. A pressure relief valve, characterized in that: The pressure relief valve comprises: a first valve body and a second valve body; One end of the second valve body is connected to the first valve body, and the other end of the second valve body is connected to the outside. The first valve body and the second valve body are connected to form a moving cavity, and a switching oil circuit component is provided in the moving cavity; The first valve body has a driving oil circuit, which includes a working oil circuit and a return oil circuit, and the oil inlets of the working oil circuit and the return oil circuit are both oriented toward the second valve body; The oil path switching component is driven by the air pressure to open the return oil path, and the oil path switching component is driven by external liquid to close the return oil path.

2. The pressure relief valve according to claim 1, characterized in that An end surface of the first valve body close to the second valve body extends toward the second valve body to form a first boss.

3. The pressure relief valve according to claim 2, characterized in that: The oil inlet of the return oil circuit is located on the first boss, and the oil outlet of the return oil circuit is located on the side wall of the first valve body.

4. The pressure relief valve according to claim 1, characterized in that The working oil circuit passes through the first valve body, and an oil inlet of the working oil circuit is located on an end surface of the first valve body close to the second valve body.

5. The pressure relief valve according to claim 1, characterized in that: The movable cavity comprises: a first sub-cavity and a second sub-cavity, wherein the inner wall of the first sub-cavity extends inwardly to form a clamping boss; The cross-sectional area of ​​the first sub-cavity is S1, and the cross-sectional area of ​​the second sub-cavity is S2, satisfying the relationship: S1<S2.

6. The pressure relief valve according to claim 5, characterized in that: The oil switching circuit component includes: a neck portion and a tail portion, wherein the neck portion is located in the first sub-cavity and the tail portion is located in the second sub-cavity; The cross-sectional area of ​​the neck portion is S3, and the cross-sectional area of ​​the tail portion is S4, satisfying the relationship: S3<S1<S4<S2.

7. The pressure relief valve according to claim 6, characterized in that: The neck is provided with a plurality of grooves, and the plurality of grooves are distributed in an array with the center of the neck as the center of a circle.

8. The pressure relief valve according to claim 6, characterized in that: The tail portion is provided with a water blocking fence, and the water blocking fence extends toward the inner wall of the second valve body to form an inclined surface.

9. The pressure relief valve according to claim 1, characterized in that: The material of the oil circuit switching component is rubber.

10. The pressure relief valve according to claim 1, wherein: A sealing layer is provided at the connection between the first valve body and the second valve body, and the sealing layer is located between the first valve body and the second valve body.

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