Pressure-adjustable pressure release valve

Abstract

The pressure-adjustable pressure release valve comprises a valve body, an air nozzle, a pressure release piston, a spring and a double-end nut, the pressure release piston is axially connected with an inner cavity of the valve body in a sliding mode and divides the inner cavity of the valve body into a pressure release cavity and a pressurizing cavity, one side of the pressure release cavity is further provided with a pressure release hole communicated with the outside, and the pressure release hole is communicated with the pressurizing cavity. One end of the valve body is provided with an air nozzle communicated with the pressurization cavity, the other end of the valve body is provided with a double-end nut, the center of the double-end nut is provided with a pressure relief flow channel communicated with the pressure relief cavity, and the spring is arranged in the pressurization cavity and forces the pressure relief piston to force the pressure relief flow channel to be closed; the control system injects gas into the pressurizing cavity to increase the pressure of the pressurizing cavity, so that the pressure relief piston is pushed to close the pressure relief flow channel with higher pressure, the pressure of the pressurizing cavity is in direct proportion to a pressure relief value in the pressurizing process, and when the pressure relief value reaches a required value, the control system stops gas supply and ensures that the pressure value of the pressurizing cavity is not changed; therefore, the pressure relief value is adjusted.

Description

Technical Field

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

[0002] The pressure relief valve is used in equipment or pipelines. When the pressure exceeds the set pressure of the pressure relief valve, it automatically opens to relieve pressure, ensuring that the medium pressure in the equipment and pipeline is below the set pressure, protecting the equipment and pipeline and preventing accidents. However, when the existing pressure relief valve is used, the pressure value during pressure relief is often fixed. The pressure will be relieved only when the pressure value reaches a predetermined value, which is not convenient for pressure regulation and control in the pipeline. It is not suitable for pipelines that need to adjust the pressure relief pressure. Therefore, a pressure-adjustable pressure relief valve is designed to solve the above problems. Utility Model Content

[0003] In view of the shortcomings of the existing pressure relief valves, the purpose of the utility model is to provide a pressure-adjustable pressure relief valve, which has the advantages of adjustable pressure relief pressure and no need for manual operation.

[0004] In order to achieve the above-mentioned purpose, a technical solution adopted by the utility model is: a pressure-adjustable pressure relief valve, including a valve body, an air nozzle, a pressure relief piston, a spring and a double-headed nut, the pressure relief piston is axially slidably connected to the internal cavity of the valve body, the pressure relief piston divides the internal cavity of the valve body into a pressure relief cavity and a pressurizing cavity, one side of the pressure relief cavity also has a pressure relief hole connected to the outside, one end of the valve body is provided with an air nozzle connected to the pressurizing cavity, the other end of the valve body is provided with a double-headed nut, the center of the double-headed nut has a pressure relief flow channel connected to the pressure relief cavity, the spring is arranged in the pressurizing cavity, and the spring forces the pressure relief piston to force the pressure relief flow channel to close;

[0005] Preferably, the pressure relief piston comprises a pneumatic piston, a sealing piston and a linkage rod, the pneumatic piston and the sealing piston are fitted to the inner wall of the internal cavity of the valve body, the diameter of the linkage rod is smaller than the diameter of the pneumatic piston and the sealing piston, one end of the linkage rod is provided with a pneumatic piston, the other end of the linkage rod is provided with a sealing piston, the pneumatic piston is in contact with a spring, and the sealing piston closes the pressure relief flow channel under the action of the spring;

[0006] Further preferably, the outer edge of the pneumatic piston has a sealing ring, and the contact surface between the sealing piston and the stud nut has a sealing ring;

[0007] Further preferably, the outer edge of the sealing piston further has a guide groove, and the guide groove is used to guide the pressure relief medium to flow out of the pressure relief hole;

[0008] Preferably, the pressure-adjustable pressure relief valve further has an external control system, and the control system injects air pressure into the pressurized cavity through a pipe connected to the air nozzle. When the control system injects pressure, the pressure relief value of the pressure relief valve increases accordingly, and when the control system does not inject pressure, the pressure relief value of the pressure relief valve is at the lower limit;

[0009] The beneficial effects of the utility model are as follows: the control system injects air pressure into the pressurized cavity through a pipe connected to the air nozzle, thereby increasing the pressure in the pressurized cavity in the pressure relief valve, thereby pushing the pressure relief piston to apply greater pressure to close the pressure relief flow channel, and in the process of injecting air pressure into the pressurized cavity, the pressure in the pressurized cavity is proportional to the pressure relief value. When the pressure relief value reaches the required value, the control system stops supplying air and ensures that the pressure value of the pressurized cavity in the valve body remains unchanged, thereby completing the adjustment of the pressure relief value. The whole process does not require manual operation and is very convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 This is a cross-sectional structural view of the utility model;

[0011] Figure 2 This is a cross-sectional structural view of the utility model in a pressure relief state;

[0012] Figure 3 This is a three-dimensional structural view of the pressure relief piston of the utility model. DETAILED DESCRIPTION

[0013] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the protection scope of the present invention.

[0014] It should be noted that, in the description of the present invention, terms such as "up", "down", "left", "right", "inside", and "outside" indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings. This is merely for the convenience of description and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention.

[0015] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "provided with", and "set" 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 directly connected, or indirectly connected through an intermediate medium, or it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0016] See also Figures 1 to 3 , the utility model embodiment includes:

[0017] A pressure-adjustable pressure relief valve comprises a valve body 1, an air nozzle 2, a pressure relief piston 3, a spring 4 and a stud nut 5. The pressure relief piston 3 is axially slidably connected to the internal cavity of the valve body 1. The pressure relief piston 3 divides the internal cavity of the valve body 1 into a pressure relief cavity 11 and a pressurizing cavity 12. One side of the pressure relief cavity 11 also has a pressure relief hole 6 connected to the outside. One end of the valve body 1 is provided with an air nozzle 2 connected to the pressurizing cavity 12. The other end of the valve body 1 is provided with a stud nut 5. The center of the stud nut 5 has a pressure relief channel 7 connected to the pressure relief cavity 11. The spring 4 is arranged in the pressurizing cavity 12. The spring 4 forces the pressure relief piston 3 to force the pressure relief channel 7 to close.

[0018] The pressure relief piston 3 comprises a pneumatic piston 31, a sealing piston 32 and a linkage rod 33. The pneumatic piston 31 and the sealing piston 32 are attached to the inner wall of the internal cavity of the valve body 1. The diameter of the linkage rod 33 is smaller than that of the pneumatic piston 31 and the sealing piston 32. The pneumatic piston 31 is arranged at one end of the linkage rod 33, and the sealing piston 32 is arranged at the other end of the linkage rod 33. The pneumatic piston 31 contacts the spring 4, and the sealing piston 32 closes the pressure relief channel 7 under the action of the spring 4.

[0019] The outer edge of the pneumatic piston 31 has a sealing ring, and the contact surface between the sealing piston 32 and the stud nut 5 has a sealing ring;

[0020] The outer edge of the sealing piston 32 also has a guide groove 34, and the guide groove 34 is used to guide the pressure relief medium to flow out of the pressure relief hole 6;

[0021] The adjustable pressure relief valve also has an external control system, which injects air pressure into the pressurized cavity 12 through a pipe connected to the air nozzle 2. When the control system injects pressure, the pressure relief value of the pressure relief valve increases accordingly. When the control system does not inject pressure, the pressure relief value of the pressure relief valve is at the lower limit.

[0022] Through the above settings, in the actual working process, its specific working principle is as follows:

[0023] First, the adjustable pressure relief valve is installed in the pipeline, and it is ensured that the pipeline is connected with the pressure relief flow channel 7. When the pressure relief value of the pressure relief valve needs to be changed, the control system injects air pressure into the pressurized cavity 12 through the pipeline connected to the air nozzle 2, so that the pressure of the pressurized cavity 12 in the pressure relief valve increases, thereby pushing the pressure relief piston 3 to apply greater pressure to close the pressure relief flow channel 7, and in the process of injecting air pressure into the pressurized cavity 12, the pressure in the pressurized cavity 12 is proportional to the pressure relief value. When the pressure relief value reaches the required value, the control system stops supplying air and ensures that the pressure value of the pressurized cavity 12 in the valve body 1 remains unchanged, thereby completing the adjustment of the pressure relief value;

[0024] The above description is only an embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A pressure-adjustable pressure relief valve, characterized in that: The nut comprises a valve body, an air nozzle, a pressure relief piston, a spring and a double-headed nut. The pressure relief piston is axially slidably connected to the internal cavity of the valve body. The pressure relief piston divides the internal cavity of the valve body into a pressure relief cavity and a pressurizing cavity. One side of the pressure relief cavity also has a pressure relief hole connected to the outside. An air nozzle connected to the pressurizing cavity is provided at one end of the valve body. A double-headed nut is provided at the other end of the valve body. A pressure relief channel connected to the pressure relief cavity is provided in the center of the double-headed nut. The spring is arranged in the pressurizing cavity. The spring forces the pressure relief piston to close the pressure relief channel.

2. The pressure-adjustable relief valve according to claim 1, characterized in that: The pressure relief piston comprises a pneumatic piston, a sealing piston and a linkage rod. The pneumatic piston and the sealing piston fit the inner wall of the internal cavity of the valve body. The diameter of the linkage rod is smaller than the diameter of the pneumatic piston and the sealing piston. A pneumatic piston is provided at one end of the linkage rod, and a sealing piston is provided at the other end of the linkage rod. The pneumatic piston is in contact with a spring, and the sealing piston closes the pressure relief channel under the action of the spring.

3. The pressure-adjustable pressure relief valve according to claim 2, characterized in that: The outer edge of the pneumatic piston is provided with a sealing ring, and the contact surface between the sealing piston and the stud nut is provided with a sealing ring.

4. The pressure-adjustable pressure relief valve according to claim 2, characterized in that: The outer edge of the sealing piston also has a guide groove, and the guide groove is used to guide the pressure relief medium to flow out of the pressure relief hole.

5. The pressure-adjustable relief valve according to claim 1, characterized in that: The pressure-adjustable pressure relief valve also has an external control system, which injects air pressure into the pressurized cavity through a pipe connected to the air nozzle. When the control system injects pressure, the pressure relief value of the pressure relief valve increases accordingly. When the control system does not inject pressure, the pressure relief value of the pressure relief valve is at the lower limit.

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