Pneumatic control automatic pressure release valve

Abstract

The invention relates to the technical field of valves, and provides a pneumatic control automatic pressure release valve which comprises a valve body provided with a main valve through hole, a branch opening and a mounting hole which communicate with one another. The control part comprises a valve clack arranged in the through hole of the main valve, a connecting rod, a first pushing piece, a second pushing piece and a conversion part which does not contain a spring and is positioned in the closed space; the valve clack is connected to the first pushing piece and the second pushing piece through the connecting rod, and the first pushing piece and the second pushing piece are slidably connected to the inner wall of the mounting hole; a closed space is defined by the first pushing piece, the second pushing piece and the mounting hole, the conversion part is provided with a pushing through hole, and the first pushing piece is arranged in the pushing through hole; the branch pipe is connected to the branch opening and the pushing through hole; the switching part controls the communication relation between the pushing through hole and the closed space, and then the main valve through hole is opened or closed. According to the pneumatic control automatic pressure release valve, the situation that a high-temperature medium makes direct contact with the spring, and then the pre-tightening force of the spring is affected can be avoided.

Description

Technical Field

[0001] The present application relates to the field of valve technology, and in particular to a gas-controlled automatic pressure relief valve. Background Art

[0002] In the process of chemical production, the transportation of some high-temperature and high-pressure gases is sometimes involved, especially the temperature of some gases needs to be maintained within a certain temperature range.

[0003] The pneumatically controlled automatic pressure relief valve in the related art sets a preload by means of a spring, so that the pressure relief valve can promptly perform a pressure relief operation when the preload is exceeded; when the pneumatically controlled automatic pressure relief valve in the related art is used to perform a pressure relief operation on high-temperature and high-pressure gas, the spring therein will directly contact the high-temperature gas, which will cause the spring material to soften and corrode the spring, thereby affecting the relationship between the spring elastic force and the spring length, and thus affecting the preload set by the spring. Summary of the invention

[0004] The embodiment of the present application provides a pneumatically controlled automatic pressure relief valve, which can improve the technical problem existing in the related art that a high-temperature medium directly contacts a spring and thus affects the preload force of the spring.

[0005] The present application embodiment provides a gas-controlled automatic pressure relief valve, comprising: A valve body having a main valve through hole, a branch port and a mounting hole, wherein the main valve through hole is respectively connected to the branch port and the mounting hole; A control part, comprising a valve flap, a connecting rod, a first pusher, a second pusher and a conversion part without a spring; the valve flap is movably arranged in the main valve through hole and is connected to the first pusher and the second pusher through the connecting rod, the first pusher and the second pusher are slidably abutted against the inner wall of the mounting hole, and the first pusher and the second pusher are sealed and arranged in the mounting hole; the first pusher, the second pusher and the side wall of the mounting hole form a closed space, the conversion part is located in the closed space, the conversion part has a pushing through hole, the first pusher is movably arranged in the pushing through hole, and the first pusher is sealed and arranged in the pushing through hole; and A branch pipe, one end of which is connected to the branch port, and the other end of which is connected to the push through hole; Wherein, the conversion part is used to connect the push through hole with the closed space, so that the valve flap opens the main valve through hole to allow fluid to enter from the inlet of the main valve through hole and flow out from the outlet of the main valve through hole; the conversion part is also used to disconnect the connection between the push through hole and the closed space, so that the valve flap closes the main valve through hole to limit the fluid from passing through the main valve through hole.

[0006] The above technical solutions in the embodiments of the present application have at least the following technical effects: An air-controlled automatic pressure relief valve provided in an embodiment of the present application is connected by a first pusher, a second pusher and a valve flap through a connecting rod, so that the valve flap can be indirectly controlled by pushing the first pusher and the second pusher to open or close the main valve through hole. When the pressure in the push through hole is greater than the deflated pressure, the high-temperature and high-pressure gas in the push through hole controls the conversion part so that the push through hole is connected to the closed space, and then the high-temperature and high-pressure gas in the closed space pushes the second pusher toward the valve flap, so that the valve flap opens the main valve through hole, thereby releasing pressure; when the pressure in the push through hole is less than the deflated pressure, the conversion part isolates the push through hole from the closed space so that a certain pressure is maintained in the main valve through hole; and the conversion part does not include a spring. Compared with the pilot pressure relief valve that directly contacts the internal medium through a spring and provides a preset force at the same time, the above scheme can work in different working environments so that its preset pressure is not affected by temperature. In addition, the spring in the spring-operated pressure relief valve is in direct contact with the internal medium. When the temperature of the internal medium is too high, the elastic force of the spring is greatly affected. However, this solution is not affected by the medium temperature.

[0007] In some embodiments, the conversion unit includes: A conversion body is located in the closed space, one end of the conversion body is connected to one end of the branch pipe, and the conversion body has the push through hole; the conversion body is provided with a connecting hole, and the connecting hole connects the closed space with the push through hole; a side wall of the connecting hole is provided with a preset space, and the preset space is isolated from the push through hole; and A first switch member is movably disposed in the preset space, and the first switch member is sealed with a side wall of the preset space; Among them, when the pressure in the connecting hole is greater than the deflated pressure, the high-temperature and high-pressure gas in the connecting hole pushes the first switch component to move away from the connecting hole, so that the closed space and the push through hole are connected through the connecting hole; when the pressure in the connecting hole is less than the deflated pressure, the first switch component moves toward the connecting hole to close the connecting hole, thereby disconnecting the connection between the closed space and the push through hole.

[0008] In some embodiments, the connecting rod has a liquid storage hole, and the opening direction of the liquid storage hole is close to the first pushing member; the air-controlled automatic pressure relief valve also includes a second switch member and a liquid, the liquid is placed in the liquid storage hole, and the volume of the liquid is smaller than the volume of the liquid storage hole, the second switch member is movably arranged in the liquid storage hole, and the second switch member is sealed in the liquid storage hole to isolate the liquid from the external space; the conversion part also includes a connecting tube, one end of the connecting tube is connected to the conversion body, and the other end is connected to the connecting rod, and the liquid storage hole is communicated with the preset space through the connecting tube.

[0009] In some embodiments, the connecting tube includes a first right-angle bend and a second right-angle bend; one end of the first right-angle bend is arranged on the connecting rod, and the internal space of the first right-angle bend is connected to the liquid storage hole; one end of the second right-angle bend is arranged on the conversion body, and the internal space of the second right-angle bend is connected to the preset space, and the other end of the second right-angle bend is movably and sealedly arranged in the first right-angle bend.

[0010] In some embodiments, a projection area of ​​the second pusher on a plane perpendicular to its moving direction is larger than a total projection area of ​​the first pusher and the valve flap on the plane.

[0011] In some embodiments, a connecting port is opened on the side wall of the conversion body near the first pushing member, and the connecting port connects the connecting hole with the closed space; the first pushing member has a return pushing end, and the return pushing end is movably arranged in the connecting port and extends into the preset space, and the return pushing end is sealed in the connecting port.

[0012] In some embodiments, the first pushing member is provided with an air leak hole; when the pressure in the connecting hole is lower than the warning pressure, the closed space is connected to the liquid storage hole through the air leak hole; when the pressure in the connecting hole is higher than the warning pressure, the air leak hole is closed to isolate the closed space from the liquid storage hole.

[0013] In some embodiments, the air-controlled automatic pressure relief valve further includes a plurality of high temperature resistant seals, which are disposed on the inner wall of the liquid storage hole, and there is at least one seal on each side of the connection between the air relief hole and the liquid storage hole.

[0014] In some embodiments, a plurality of the sealing members are disposed on the side walls of the first pushing member and the second pushing member, and at least one of the sealing members is also disposed on the side wall of the valve flap facing the second pushing member.

[0015] In some embodiments, the second switch member has a protruding end, and the protruding end is located on a side of the second switch member facing away from the second pushing member. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application, 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 of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0017] Figure 1 A schematic cross-sectional view of the gas-controlled automatic pressure relief valve provided in an embodiment of the present application; Figure 2 for Figure 1 A partial enlarged schematic diagram in the middle; Figure 3 for Figure 1 A partial enlarged schematic diagram of point B in the middle.

[0018] Among them, the reference numerals in the figure are: 100. Air-controlled automatic pressure relief valve; 10, valve body; 10a, main valve through hole; 100a, exhaust hole; 101a, connection hole; 10b, branch port; 10c, installation hole; 20. Control unit; 21. Valve flap; 22. Connecting rod; 22a. Liquid storage hole; 23. First pusher; 231. Return pusher end; 23a. Air release hole; 24. Second pusher; 24a. Enclosed space; 25. Conversion unit; 25a. Push through hole; 251. Conversion body; 251a. Communication hole; 251b. Preset space; 251c. Connecting port; 252. First switch unit; 253. Connecting pipe; 2531. First right-angle bend pipe; 2532. Second right-angle bend pipe; 30. branch pipe; 40. second switch member; 41. protruding end; 50. liquid; 60. sealing member; 70. partition member; 70a. switch hole; 80. warning adjustment member; 90. pressure relief adjustment member. DETAILED DESCRIPTION

[0019] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0020] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application. The terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned figure descriptions are intended to cover non-exclusive inclusions.

[0021] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0022] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0023] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0024] In this application, "and / or" is only a description of the association relationship of associated objects, indicating that there can be three relationships; for example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0025] It should be noted that, in the present application, words such as "in some embodiments", "exemplarily", "for example", etc. are used to indicate examples, illustrations or descriptions. Any embodiment or design described in the present application as "in some embodiments", "exemplarily", "for example" should not be interpreted as being more preferred or more advantageous than other embodiments or designs. Specifically, the use of words such as "in some embodiments", "exemplarily", "for example", etc. is intended to present related concepts in a concrete way, meaning that specific features, structures or characteristics described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the above words in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0026] The gas-controlled automatic pressure relief valve is connected to the high-pressure pipeline to prevent the gas pressure in the high-pressure pipeline from being too high. When the gas pressure in the high-pressure pipeline is too high, the high-pressure pipeline is deflated.

[0027] In the air-controlled automatic pressure relief valve in the related art, during operation, the medium will directly contact the spring, which will cause the spring material to soften and corrode the spring, and the above problems will affect the size of the preload force set on the spring.

[0028] Based on this, in order to improve the technical problem in the related art that the high-temperature medium directly contacts the spring and thus affects the preload force of the spring, the embodiment of the present application provides the following solution.

[0029] Please also read Figure 1 and Figure 2 The embodiment of the present application provides a pneumatically controlled automatic pressure relief valve 100, which includes a valve body 10, a control unit 20 and a branch pipe 30. Among them: The valve body 10 has a main valve through hole 10a, a branch port 10b and a mounting hole 10c. The main valve through hole 10a is communicated with the branch port 10b and the mounting hole 10c, respectively.

[0030] The control part 20 includes a valve flap 21, a connecting rod 22, a first push member 23, a second push member 24 and a conversion part 25, and the conversion part 25 does not include a spring; the valve flap 21 is movably arranged in the main valve through hole 10a, and is connected to the first push member 23 and the second push member 24 through the connecting rod 22, the first push member 23 and the second push member 24 are slidably abutted against the inner wall of the mounting hole 10c, and the first push member 23 and the second push member 24 are sealed in the mounting hole 10c; and the first push member 23, the second push member 24 and the side wall of the mounting hole 10c form a closed space 24a, the conversion part 25 with a push through hole 25a is located in the closed space 24a, the first push member 23 is partially movably arranged in the push through hole 25a, and the first push member 23 is sealed in the push through hole 25a.

[0031] One end of the branch pipe 30 is connected to the branch port 10b, and the other end is connected to the push through hole 25a.

[0032] Among them, the conversion part 25 is used to connect the push through hole 25a with the closed space 24a, so that the valve flap 21 opens the main valve through hole 10a to allow the fluid to enter from the inlet of the main valve through hole 10a and flow out from the outlet of the main valve through hole 10a; the conversion part 25 is also used to disconnect the connection between the push through hole 25a and the closed space 24a, so that the valve flap 21 closes the main valve through hole 10a to limit the fluid from passing through the main valve through hole 10a.

[0033] It can be understood that the valve body 10 is a component for connecting a pressure device; for example, the valve body 10 can be a metal valve body 10. The control part 20 is used to control the gas-controlled automatic pressure relief valve 100 to perform a pressure relief operation according to the pressure in the main valve through hole 10a; for example, the control part 20 can be a component that controls the gas-controlled automatic pressure relief valve 100 to open or close the main valve through hole 10a; for example, the control part 20 can be a component composed of a valve flap 21, a connecting rod 22, a first pusher 23, a second pusher 24 and a conversion part 25; the connecting rod 22 is a component for connecting the valve flap 21, the first pusher 23 and the second pusher 24; for example, the connecting rod 22 can be a metal rod or a metal shell, etc. The first pusher 23 and the second pusher 24 are components for pushing the valve flap 21 to open or close the main valve through hole 10a; for example, the first pusher 23 and the second pusher 24 can both be a metal block or a metal piston, etc. The conversion part 25 is a component for controlling the communication relationship between the closed space 24a and the push through hole 25a; for example, the conversion part 25 can be a component composed of a conversion body 251 and a first switch member 252. The deflation pressure is the critical pressure at which the air-controlled automatic pressure relief valve 100 opens the main valve through hole 10a for pressure relief.

[0034] As can be seen from the above, the pneumatic automatic pressure relief valve 100 provided in the embodiment of the present application connects the first pusher 23, the second pusher 24 and the valve flap 21 through the connecting rod 22, so that the valve flap 21 can be indirectly controlled by pushing the first pusher 23 and the second pusher 24 to open or close the main valve through hole 10a. When the pressure in the pushing through hole 25a is greater than the deflated pressure, the high-temperature and high-pressure gas in the pushing through hole 25a controls the conversion part 25, so that the pushing through hole 25a is connected with the closed space 24a, and then the high-temperature and high-pressure gas in the closed space 24a pushes the second pusher 24 to move toward the valve flap 21, so that the valve flap 21 opens the main valve through hole 10a, thereby releasing pressure; when the pressure in the pushing through hole 25a is less than the deflated pressure, the conversion part 25 isolates the pushing through hole 25a from the closed space 24a, so that a certain pressure is maintained in the main valve through hole 10a; and the conversion part 25 does not include a spring. Compared with the pilot-operated pressure relief valve that directly contacts the internal medium through the spring and provides the preset force, the above solution can make its pressure relief pressure not affected by temperature in different working environments. In addition, the spring in the pilot-operated pressure relief valve with a spring is in direct contact with the internal medium. When the temperature of the internal medium is too high, the elastic force of the spring is greatly affected. However, this solution is not affected by the temperature of the medium.

[0035] In some embodiments, please refer to Figures 1 to 3 The conversion part 25 includes a conversion body 251 and a first switch member 252. Wherein: The conversion body 251 is located in the closed space 24a, one end of the conversion body 251 is connected to one end of the branch pipe 30, and the conversion body 251 has a push hole 25a; the conversion body 251 is provided with a connecting hole 251a, and the connecting hole 251a connects the closed space 24a with the push hole 25a; the side wall of the connecting hole 251a is provided with a preset space 251b, and the preset space 251b is isolated from the push hole 25a.

[0036] The first switch member 252 is movably disposed in the preset space 251 b ; and the first switch member 252 and the side wall of the preset space 251 b are sealed.

[0037] Among them, when the pressure in the connecting hole 251a is greater than the warning pressure, the high-temperature and high-pressure gas in the connecting hole 251a pushes the first switch component 252 to move back to the connecting hole 251a, so that the closed space 24a and the pushing through hole 25a are connected through the connecting hole 251a; when the pressure in the connecting hole 251a is less than the warning pressure, the first switch component 252 moves toward the connecting hole 251a to close the connecting hole 251a, thereby disconnecting the connection between the closed space 24a and the pushing through hole 25a.

[0038] It can be understood that the conversion body 251 and the first switch 252 are components for controlling the connection between the closed space 24a and the push hole 25a; for example, the conversion body 251 can be a metal box composed of a metal plate provided with a heat insulation layer (aluminum foil layer or glass wool layer, etc.). For example, the first switch 252 can be a metal block or a metal piston provided with a heat insulation layer (aluminum foil layer or glass wool layer, etc.). The warning pressure is the critical pressure for the conversion part 25 to open or close the connecting hole 251a. For example, when the gas-controlled automatic pressure relief valve 100 works in a chemical pipeline, the critical pressure is between 80% and 90% of the design pressure of the chemical pipeline; those skilled in the art can set it according to actual needs, and it is not limited here.

[0039] In this way, the conversion body 251 is set to partially close the connection between the closed space 24a and the push hole 25a, and a small part of the controllable connecting hole 251a is left, so that the first switch 252 can open or close the connecting hole 251a, thereby controlling the connection relationship between the closed space 24a and the push hole 25a. Compared with the scheme in which the elastic element and the first switch 252 are directly matched, the elastic element connects one end of the first switch 252 to the inner wall of the push hole 25a, and the first switch 252 is movably located in the push hole 25a. The above scheme can avoid the contact between the elastic element and the high-temperature medium, thereby reducing the damage to the conversion part 25, thereby extending the working time of the conversion part 25.

[0040] Optionally, in some embodiments, see Figure 1 and Figure 2 The connecting rod 22 has a liquid storage hole 22a, and the opening direction of the liquid storage hole 22a is close to the first push member 23; the pneumatic automatic pressure relief valve 100 also includes a second switch member 40 and a liquid 50, the liquid 50 is placed in the liquid storage hole 22a, and the volume of the liquid 50 is smaller than the volume of the liquid storage hole 22a, the second switch member 40 is movably arranged in the liquid storage hole 22a, and the second switch member 40 is sealed in the liquid storage hole 22a to isolate the liquid 50 from the external space; the conversion part 25 also includes a connecting tube 253, one end of the connecting tube 253 is connected to the conversion body 251, and the other end is connected to the connecting rod 22, and the liquid storage hole 22a is communicated with the preset space 251b through the connecting tube 253.

[0041] It can be understood that the second switch member 40 is a component used to isolate the liquid 50 from the external space; for example, the second switch member 40 can be a metal block or a metal piston. The connecting pipe 253 is a component used to connect the preset space 251b with the liquid storage hole 22a. The liquid 50 can be mercury or silicone oil. In this way, the preset space 251b is connected to the liquid storage hole 22a through the connecting tube 253, so that the liquid 50 can move freely in the preset space 251b and the liquid storage hole 22a. The liquid 50 is isolated from the external space by the second switch 40 to reduce the influence of the external environment on the internal liquid 50. The gravity of the liquid 50 due to the height difference between the liquid 50 in the liquid storage hole 22a and the liquid 50 in the preset space 251b and the gravity of the second switch 40 provide pressure to the side of the first switch 252 facing away from the connecting hole 251a, so that the first switch 252 can close the connecting hole 251a when the pressure of the connecting hole 251a is less than the warning pressure; and the first switch 252 can open the connecting hole 251a when the pressure of the connecting hole 251a is greater than the pressure relief pressure (the pressure relief pressure is greater than the warning pressure), thereby performing the pressure relief operation. Compared with the solution of directly supplying and releasing gas to the preset space 251b through the gas supply device, the change in the temperature of the liquid 50 in the above solution has little effect on the volume, while the change in the gas temperature has a great effect on the volume, thereby reducing the effect of temperature on the deflation pressure; and if the use of the inflation device involves a pressure sensor and a single-chip microcomputer, the above solution can reduce the manufacturing cost, maintenance cost and service life of the gas-controlled automatic pressure relief valve 100.

[0042] Optionally, see Figures 1 to 3 The connecting tube 253 includes a first right-angle bend 2531 and a second right-angle bend 2532; one end of the first right-angle bend 2531 is arranged on the connecting rod 22, and the internal space of the first right-angle bend 2531 is connected to the liquid storage hole 22a; one end of the second right-angle bend 2532 is arranged on the conversion body 251, and the internal space of the second right-angle bend 2532 is connected to the preset space 251b, and the other end of the second right-angle bend 2532 is movably and sealedly arranged in the first right-angle bend 2531.

[0043] In this way, the length of the connecting tube 253 is set to be greater than the distance between the connecting rod 22 and the conversion body 251, so that the connecting tube 253 can adapt to the additional distance between the connecting rod 22 and the conversion body 251 caused by the movement of the connecting rod 22; and because the length of the connecting tube 253 is set to be greater than the distance between the connecting rod 22 and the conversion body 251, the connecting tube 253 needs to be set as a flexible metal bellows.

[0044] For example, see Figure 1 The projection area of ​​the second push member 24 on the plane perpendicular to its moving direction is larger than the total projection area of ​​the first push member 23 and the valve flap 21 on the same plane. When the pressure in the closed space 24a is greater than the deflation pressure, the valve flap 21 opens the main valve through hole 10a; and the deflation pressure is greater than the warning pressure.

[0045] In this way, by setting the area of ​​the second pusher 24 to be larger than the total area of ​​the first pusher 23 and the valve flap 21, when the first pusher 23, the second pusher 24 and the valve flap 21 are subjected to the same pressure, the total pressure of the first pusher 23, the second pusher 24 and the valve flap 21 is directed toward the pipeline or pressure vessel. By setting the deflation pressure to be larger than the warning pressure, and the deflation pressure is the design pressure of the air-controlled automatic pressure relief valve 100, the air-controlled automatic pressure relief valve 100 can have two critical pressures, wherein the smaller critical pressure is used to remind the staff, and the other larger critical pressure is used to automatically open the air-controlled automatic pressure relief valve 100, thereby protecting the pipeline or pressure vessel protected by the air-controlled automatic pressure relief valve 100.

[0046] In some embodiments, see Figures 1 to 3 A connecting port 251c is provided on the side wall of the conversion body 251 close to the first pushing member 23, and the connecting port 251c connects the connecting hole 251a with the closed space 24a; the first pushing member 23 has a return pushing end 231, and the return pushing end 231 is movably arranged in the connecting port 251c and extends into the preset space 251b, and the return pushing end 231 is sealed in the connecting port 251c.

[0047] With such a configuration, when the pressure in the push through hole 25a is lower than the warning pressure, the first switch member 252 moves toward the first push member 23, thereby closing the connecting hole 251a, and the liquid 50 in the closed space 24a is discharged through the first push member 23, thereby causing the gas in the connecting hole 251a to push the first push member 23 to move away from the valve flap 21, thereby closing the main valve through hole 10a. The above scheme enables the main valve through hole 10a to be closed only when the pressure in the connecting hole 251a is lower than the warning pressure.

[0048] Optionally, in some embodiments, see Figure 1 and Figure 2 The first push member 23 is provided with an air leakage hole 23a; when the pressure in the connecting hole is lower than the warning pressure, the closed space 24a is connected with the liquid storage hole 22a through the air leakage hole 23a; when the pressure in the connecting hole 251a is higher than the warning pressure, the air leakage hole 23a is closed to isolate the closed space 251b from the liquid storage hole 22a.

[0049] In this way, the closed space 24a is connected to the liquid storage hole 22a by setting the air leakage hole 23a, so that the gas in the closed space 24a is discharged to the external space, and then the valve flap 21 closes the main valve through hole 10a. By setting the second switch member 40, the second switch member 40 can open or close the air leakage hole 23a, so that the closed space 24a plays a gas storage or gas release role. Compared with setting the air leakage hole 23a separately, the above scheme associated with the second switch member 40 can ensure that the air leakage hole 23a is opened when the pressure in the main valve through hole 10a is less than the air leakage pressure; and ensure that the air leakage hole 23a is closed when the pressure in the main valve through hole 10a is greater than the air leakage pressure.

[0050] Optionally, see Figures 1 to 3 The air-controlled automatic pressure relief valve 100 further includes a plurality of high temperature resistant seals 60, which are arranged on the inner wall of the liquid storage hole 22a, and there is at least one seal 60 on both sides of the connection between the air relief hole 23a and the liquid storage hole 22a.

[0051] It can be understood that the seal 60 is a circular seal, which can be a polytetrafluoroethylene (PTFE) seal, a metal spiral wound gasket, a ceramic fiber packing, or the like.

[0052] In this arrangement, at least one sealing member 60 is provided on both sides of the connection between the air leakage hole 23a and the liquid storage hole 22a, so that when the second switch 40 closes the air leakage hole 23a, the air leakage hole 23a can be isolated from the external space and the air leakage hole 23a can be isolated from the liquid 50; when the second switch 40 opens the air leakage hole 23a, the air leakage hole 23a can be isolated from the liquid 50. Compared with the solution of directly arranging the sealing member 60 on the side wall of the second switch 40, the above solution can prevent the sealing member 60 from being stuck in the air leakage pipe.

[0053] In some embodiments, see Figures 1 to 3 A plurality of sealing members 60 are disposed on the side walls of the first pusher 23 and the second pusher 24 , and at least one sealing member 60 is also disposed on the side wall of the valve flap 21 facing the second pusher 24 .

[0054] In this way, a plurality of seals 60 are respectively provided on the side walls of the first pusher 23 and the second pusher 24 and at least one seal 60 is provided on the side wall of the valve flap 21 facing the second pusher 24 to ensure the internal sealing during operation.

[0055] In some embodiments, see Figure 1 and Figure 2 The second switch member 40 has a protruding end 41 , and the protruding end 41 is located on a side of the second switch member 40 facing away from the second push member 24 .

[0056] In this way, when the pressure in the enclosed space 24a is greater than the warning pressure, the protruding end 41 extends out of the mounting hole 10c for the convenience of the staff to watch; when the pressure in the enclosed space 24a is less than the warning pressure, the protruding end 41 retracts into the mounting hole 10c, thereby facilitating the staff to adjust the pressure in the pipeline.

[0057] In some embodiments, see Figures 1 to 3 The pneumatic automatic pressure relief valve 100 also includes a partition 70 having a switch hole 70a, the partition 70 is arranged in the main valve through hole 10a, and the partition 70 divides the main valve through hole 10a into an exhaust hole 100a and a connecting hole 101a, the connecting hole 101a is connected to the pipeline, the exhaust hole 100a is connected to the external space, and the switch hole 70a connects the exhaust hole 100a with the connecting hole 101a; the valve flap 21 is located in the connecting hole 101a.

[0058] In some embodiments, see Figures 1 to 3 , a scale is provided on the protruding end 41 so that the height of the liquid in the liquid storage hole 22a can be detected; the pneumatic automatic pressure relief valve 100 also includes a plurality of warning adjustment members 80 of different weights and a plurality of pressure relief adjustment members 90 of different weights, the warning adjustment member 80 is detachably provided on the protruding end 41, and the pressure relief adjustment member 90 is detachably provided on the first pushing member 23.

[0059] It can be understood that the warning adjustment member 80 is a component used to adjust the warning pressure of the gas-controlled automatic pressure relief valve 100; for example, the warning adjustment member 80 can be a metal block or a metal counterweight, etc. The pressure relief adjustment member 90 is a component used to adjust the deflation pressure of the gas-controlled automatic pressure relief valve 100; for example, the pressure relief adjustment member 90 can be a metal block or a metal counterweight, etc.

[0060] In this configuration, since the common pneumatic automatic pressure relief valve 100 has many application scenarios, the required warning pressure and pressure relief pressure are different, and the conventional pneumatic automatic pressure relief valve 100 has a fixed pressure relief pressure, which cannot adapt to application scenarios with different warning pressures and pressure relief pressures. The above scheme increases or decreases the warning adjustment member 80 to change to the required warning pressure; and increases or decreases the pressure relief adjustment member 90 to change the required pressure relief pressure; thereby enabling the pneumatic automatic pressure relief valve 100 to adapt to different application sites.

[0061] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A pneumatically controlled automatic pressure relief valve, characterized in that: include: A valve body having a main valve through hole, a branch port and a mounting hole, wherein the main valve through hole is respectively connected to the branch port and the mounting hole; A control part, comprising a valve flap, a connecting rod, a first pusher, a second pusher and a conversion part without a spring; the valve flap is movably arranged in the main valve through hole and connected to the first pusher and the second pusher through the connecting rod, the first pusher and the second pusher are slidably connected to the inner wall of the mounting hole; the first pusher, the second pusher and the side wall of the mounting hole form a closed space, the conversion part is located in the closed space, the conversion part has a pushing through hole, the first pusher is movably arranged in the pushing through hole; and A branch pipe, one end of which is connected to the branch port, and the other end of which is connected to the push through hole; Wherein, the conversion part is used to connect the push through hole with the closed space, so that the valve flap opens the main valve through hole; the conversion part is also used to disconnect the connection between the push through hole and the closed space, so that the valve flap closes the main valve through hole.

2. The pneumatic automatic pressure relief valve according to claim 1, characterized in that: The conversion unit comprises: A conversion body is located in the closed space, one end of the conversion body is connected to one end of the branch pipe, and the conversion body has the push through hole; the conversion body is provided with a connecting hole, and the connecting hole connects the closed space with the push through hole; a side wall of the connecting hole is provided with a preset space, and the preset space is isolated from the push through hole; and A first switch member is movably disposed in the preset space, and the first switch member is sealed with a side wall of the preset space; Among them, when the pressure in the connecting hole is greater than the deflated pressure, the high-temperature and high-pressure gas in the connecting hole pushes the first switch component to move away from the connecting hole, so that the closed space and the push through hole are connected through the connecting hole; when the pressure in the connecting hole is less than the deflated pressure, the first switch component moves toward the connecting hole to close the connecting hole, thereby disconnecting the connection between the closed space and the push through hole.

3. The pneumatically controlled automatic pressure relief valve according to claim 2, characterized in that: The connecting rod has a liquid storage hole, and the opening direction of the liquid storage hole is close to the first pushing member; the air-controlled automatic pressure relief valve also includes a second switch member and a liquid, the liquid is placed in the liquid storage hole, and the volume of the liquid is smaller than the volume of the liquid storage hole, the second switch member is movably arranged in the liquid storage hole, and the second switch member is sealed in the liquid storage hole to isolate the liquid from the external space; the conversion part also includes a connecting tube, one end of the connecting tube is connected to the conversion body, and the other end is connected to the connecting rod, and the liquid storage hole is communicated with the preset space through the connecting tube.

4. The pneumatically controlled automatic pressure relief valve according to claim 3, characterized in that: The connecting tube includes a first right-angle bend and a second right-angle bend; one end of the first right-angle bend is arranged on the connecting rod, and the internal space of the first right-angle bend is connected to the liquid storage hole; one end of the second right-angle bend is arranged on the conversion body, and the internal space of the second right-angle bend is connected to the preset space, and the other end of the second right-angle bend is movably and sealedly arranged in the first right-angle bend.

5. The pneumatically controlled automatic pressure relief valve according to claim 3, characterized in that: A projection area of ​​the second pushing member on a plane perpendicular to the moving direction of the second pushing member is larger than a total projection area of ​​the first pushing member and the valve flap on the plane.

6. The pneumatically controlled automatic pressure relief valve according to claim 2, characterized in that: A connecting port is provided on the side wall of the conversion body close to the first pushing member, and the connecting port connects the connecting hole with the closed space; the first pushing member has a return pushing end, and the return pushing end is movably arranged in the connecting port and extends into the preset space, and the return pushing end is sealed in the connecting port.

7. The pneumatically controlled automatic pressure relief valve according to claim 3, characterized in that: The first pushing member is provided with an air leakage hole; when the pressure in the connecting hole is lower than the warning pressure, the closed space is connected with the liquid storage hole through the air leakage hole; when the pressure in the connecting hole is higher than the warning pressure, the air leakage hole is closed to isolate the closed space from the liquid storage hole.

8. The pneumatically controlled automatic pressure relief valve according to claim 7, characterized in that: The air-controlled automatic pressure relief valve further comprises a plurality of high temperature resistant seals, which are arranged on the inner side wall of the liquid storage hole, and there is at least one seal on each of the two sides of the connection between the air relief hole and the liquid storage hole.

9. The gas-controlled automatic pressure relief valve according to claim 8, characterized in that: The side walls of the first pushing member and the second pushing member are provided with a plurality of the sealing members, and at least one of the sealing members is also provided on the side wall of the valve flap facing the second pushing member.

10. The gas-controlled automatic pressure relief valve according to claim 5, characterized in that: The second switch member has a protruding end, and the protruding end is located at a side of the second switch member facing away from the second pushing member.

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