A pneumatically controlled automatic pressure relief valve

Abstract

This application relates to the technical field of valves and provides a pneumatically controlled automatic pressure relief valve. The pneumatically controlled automatic pressure relief valve includes a valve body having a main valve through hole, a branch port, and a mounting hole that communicate with each other; the control part includes a valve flap, a connecting rod, a first pusher, a second pusher, and a conversion part located in a closed space without a spring disposed in the main valve through hole; the valve flap is connected to the first pusher and the second pusher through the connecting rod, and 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 mounting hole enclose a closed space, the conversion part has a pushing through hole, and the first pusher is disposed in the pushing through hole; a branch pipe is connected to the branch port and the pushing through hole; the conversion part controls the communication relationship between the pushing through hole and the closed space, thereby opening or closing the main valve through hole. The pneumatically controlled automatic pressure relief valve provided by this application can prevent high-temperature media from directly contacting the spring and thus affecting the pre-tightening force of the spring.

Description

Technical Field

[0001] This application relates to the technical field of valves, and particularly to a pneumatically 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] In the pneumatically controlled automatic pressure relief valve in the related art, a pre-tightening force is set through a spring so that the pressure relief valve can perform a pressure relief operation in time when the pre-tightening force is exceeded; when the pneumatically controlled automatic pressure relief valve in the related art is used for pressure relief operation of high-temperature and high-pressure gases, the spring therein will directly contact the high-temperature gas, which will cause the spring material to soften and corrode the spring, and further affect the relationship between the spring force and the spring length, thus affecting the pre-tightening force set by the spring. Summary of the Invention

[0004] The embodiments of this application provide a pneumatically controlled automatic pressure relief valve, which can improve the technical problem that the high-temperature medium directly contacts the spring in the related art and thus affects the pre-tightening force of the spring.

[0005] The embodiments of this application provide a pneumatically controlled automatic pressure relief valve, including:

[0006] A valve body having a main valve through hole, a branch port, and a mounting hole, the main valve through hole being respectively communicated with the branch port and the mounting hole;

[0007] A control part including a valve flap, a connecting rod, a first pushing member, a second pushing member, 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 pushing member and the second pushing member through the connecting rod, the first pushing member and the second pushing member slide and abut against the inner wall of the mounting hole, and the first pushing member and the second pushing member are hermetically arranged in the mounting hole; a closed space is formed by the first pushing member, the second pushing member, and the side wall of the mounting hole, the conversion part is located in the closed space, the conversion part has a pushing through hole, the first pushing member is movably arranged in the pushing through hole, and the first pushing member is hermetically arranged in the pushing through hole; and

[0008] A branch pipe, one end of which is connected to the branch port and the other end is connected to the pushing through hole;

[0009] Wherein, the conversion part is used to connect the pushing through-hole with the closed space, so as to open the main valve through-hole by the valve flap, allowing 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 pushing through-hole and the closed space, so as to close the main valve through-hole by the valve flap to restrict the fluid from passing through the main valve through-hole.

[0010] The above technical solutions in the embodiments of the present application have at least the following technical effects:

[0011] An air-controlled automatic pressure relief valve provided by an embodiment of the present application connects a first pushing member, a second pushing member and a valve flap through a connecting rod, so that the valve flap can be indirectly controlled to open or close the main valve through-hole by pushing the first pushing member and the second pushing member. When the pressure in the pushing through-hole is greater than the pressure relief value, the high-temperature and high-pressure gas in the pushing through-hole controls the conversion part, so that the pushing through-hole is connected with the closed space, and then the high-temperature and high-pressure gas in the closed space pushes the second pushing member to move towards the valve flap, and then the valve flap opens the main valve through-hole to release pressure; when the pressure in the pushing through-hole is less than the pressure relief value, the conversion part isolates the pushing through-hole from the closed space, so that a certain pressure is maintained in the main valve through-hole; and there is no spring in the conversion part. Compared with a pilot-operated pressure relief valve that directly contacts the internal medium through a spring and provides a preset force at the same time, the above solution can be in different working environments so that its preset pressure is not affected by temperature. And in a pilot-operated pressure relief valve using a spring, the spring is in direct contact with the internal medium. When the temperature of the internal medium is too high, the elasticity of the spring is greatly affected, but this solution is not affected by the medium temperature.

[0012] In some embodiments, the conversion part includes:

[0013] A conversion main body located in the closed space. One end of the conversion main body is connected to one end of the branch pipe. The conversion main body has the pushing through-hole; the conversion main body is provided with a communication hole that connects the closed space with the pushing through-hole; a preset space is provided on the side wall of the communication hole, and the preset space is isolated from the pushing through-hole; and

[0014] A first switch member is movably arranged in the preset space, and the first switch member is hermetically arranged with the side wall of the preset space;

[0015] Wherein, when the pressure in the communication hole is greater than the pressure relief pressure, the high-temperature and high-pressure gas in the communication hole pushes the first switch member to move away from the communication hole, so that the closed space is communicated with the pushing through hole through the communication hole; when the pressure in the communication hole is less than the pressure relief pressure, the first switch member moves towards the communication hole to close the communication hole, thereby disconnecting the communication relationship between the closed space and the pushing through hole.

[0016] 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 pneumatic automatic pressure relief valve further includes a second switch member and a liquid, the liquid is placed in the liquid storage hole, and the volume of the liquid is less 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 hermetically arranged in the liquid storage hole to isolate the liquid from the external space; the conversion part further includes a connecting pipe, one end of the connecting pipe is connected to the conversion body, the other end is connected to the connecting rod, and the liquid storage hole is communicated with the preset space through the connecting pipe.

[0017] In some embodiments, the connecting pipe includes a first right-angle elbow and a second right-angle elbow; one end of the first right-angle elbow is arranged on the connecting rod, and the internal space of the first right-angle elbow is communicated with the liquid storage hole; one end of the second right-angle elbow is arranged on the conversion body, and the internal space of the second right-angle elbow is communicated with the preset space, and the other end of the second right-angle elbow is movably and hermetically arranged in the first right-angle elbow.

[0018] In some embodiments, the projected area of the second pushing member on a plane perpendicular to its moving direction is greater than the total projected area of the first pushing member and the valve flap on the plane.

[0019] In some embodiments, a connection port is formed on the side wall of the conversion body close to the first pushing member, and the connection port communicates the communication hole with the closed space; the first pushing member has a return pushing end, the return pushing end is movably arranged in the connection port and extends into the preset space, and the return pushing end is hermetically arranged in the connection port.

[0020] In some embodiments, the first pushing member is provided with a pressure relief hole; when the pressure in the communication hole is less than the warning pressure, the closed space is communicated with the liquid storage hole through the pressure relief hole; when the pressure in the communication hole is greater than the warning pressure, the pressure relief hole is closed to isolate the closed space from the liquid storage hole.

[0021] In some embodiments, the pneumatically controlled automatic pressure relief valve further includes 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 side of the connection between the air release hole and the liquid storage hole.

[0022] In some embodiments, a plurality of the seals are arranged on the side walls of the first pushing member and the second pushing member, and at least one of the seals is further arranged on the side wall of the valve flap facing the second pushing member.

[0023] In some embodiments, the second switch member has a protruding end, and the protruding end is located on the side of the second switch member facing away from the second pushing member. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0025] Figure 1 is a schematic cross-sectional structure view of the pneumatically controlled automatic pressure relief valve provided by the embodiment of the present application;

[0026] Figure 2 is Figure 1 a partial enlarged view of part A in

[0027] Figure 3 is Figure 1 a partial enlarged view of part B in

[0028] Among them, the reference numerals in the drawings are as follows:

[0029] 100, pneumatically controlled automatic pressure relief valve;

[0030] 10, valve body; 10a, main valve through hole; 100a, exhaust hole; 101a, connection hole; 10b, branch port; 10c, mounting hole;

[0031] 20, control part; 21, valve flap; 22, connecting rod; 22a, liquid storage hole; 23, first pushing member; 231, return pushing end; 23a, air release hole; 24, second pushing member; 24a, closed space; 25, conversion part; 25a, pushing through hole; 251, conversion main body; 251a, communication hole; 251b, preset space; 251c, connection port; 252, first switch member; 253, connecting pipe; 2531, first right-angled elbow; 2532, second right-angled elbow;

[0032] 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 implementation manners

[0033] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application clearer and more understandable, the present application will be further described in detail below with reference to 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.

[0034] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field 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 drawings are intended to cover non-exclusive inclusion.

[0035] 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.

[0036] It should be understood that the orientation or positional relationship indicated by the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing this application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to this application.

[0037] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of this application, "a plurality of" means two or more unless otherwise specifically defined.

[0038] In this application, " / and / " is only a description of the association relationship of associated objects, indicating that three relationships can exist; for example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this article generally represents an "or" relationship between the associated objects before and after.

[0039] It should be noted that in this application, words such as "in some embodiments", "exemplarily", and "for example" are used to give examples, illustrations, or explanations. Any embodiment or design described as "in some embodiments", "exemplarily", or "for example" in this application should not be construed as being more preferred or having more advantages than other embodiments or designs. Rather, the use of words such as "in some embodiments", "exemplarily", and "for example" is intended to present relevant concepts in a specific manner, meaning that the specific features, structures, or characteristics described in combination with the embodiments may be included in at least one embodiment of this application. The appearance of the above words at various positions in the specification does not necessarily refer to the same embodiment, nor are they independent or alternative embodiments mutually exclusive with other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein may be combined with other embodiments.

[0040] The pneumatically controlled automatic pressure relief valve is connected to a high-pressure pipeline to prevent the gas pressure in the high-pressure pipeline from being too high. In the case where the gas pressure in the high-pressure pipeline is too high, a pressure relief operation is performed on the high-pressure pipeline.

[0041] In the pneumatically controlled automatic pressure relief valve in the related art, during the working process, the medium will directly contact the spring, which will in turn cause problems such as the softening of the spring material and the corrosion of the spring, and the above problems will affect the magnitude of the preload set by the spring.

[0042] 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 of the spring, the embodiments of this application provide the following solutions.

[0043] Please refer to Figure 1 and Figure 2 simultaneously. The embodiments of this application provide a pneumatically controlled automatic pressure relief valve 100, which includes a valve body 10, a control part 20, and a branch pipe 30. Among them:

[0044] The valve body 10 has a main valve through hole 10a, a branch port 10b, and a mounting hole 10c, and the main valve through hole 10a is respectively communicated with the branch port 10b and the mounting hole 10c.

[0045] The control unit 20 includes a valve flap 21, a connecting rod 22, a first pusher 23, a second pusher 24, and a conversion unit 25, and the conversion unit 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 pusher 23 and the second pusher 24 through the connecting rod 22. The first pusher 23 and the second pusher 24 are in sliding abutment with the inner wall of the mounting hole 10c, and the first pusher 23 and the second pusher 24 are hermetically arranged in the mounting hole 10c; moreover, a closed space 24a is formed by the first pusher 23, the second pusher 24, and the side wall of the mounting hole 10c, and the conversion unit 25 having a pushing through hole 25a is located in the closed space 24a. The first pusher 23 is partially movably arranged in the pushing through hole 25a, and the first pusher 23 is hermetically arranged in the pushing through hole 25a.

[0046] One end of the branch pipe 30 is connected to the branch port 10b, and the other end is connected to the pushing through hole 25a.

[0047] Wherein, the conversion unit 25 is used to connect the pushing through hole 25a with the closed space 24a, so as to open the main valve through hole 10a by the valve flap 21, allowing 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 unit 25 is also used to disconnect the connection between the pushing through hole 25a and the closed space 24a, so as to close the main valve through hole 10a by the valve flap 21 to restrict the fluid from passing through the main valve through hole 10a.

[0048] 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 unit 20 is used to control the pneumatic 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 unit 20 can be a component for controlling the pneumatic automatic pressure relief valve 100 to open or close the main valve through hole 10a; for example, the control unit 20 can be a component composed of the valve flap 21, the connecting rod 22, the first pusher 23, the second pusher 24, and the conversion unit 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 housing, 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, both the first pusher 23 and the second pusher 24 can be metal blocks or metal pistons, etc. The conversion unit 25 is a component for controlling the connection relationship between the closed space 24a and the pushing through hole 25a; for example, the conversion unit 25 can be a component composed of a conversion body 251 and a first switch member 252. The pressure relief pressure is the critical pressure at which the pneumatic automatic pressure relief valve 100 opens the main valve through hole 10a for pressure relief.

[0049] As can be seen from the above, for the pneumatically controlled automatic pressure relief valve 100 provided in the embodiments of the present application, the first pusher 23, the second pusher 24 and the valve flap 21 are connected by a connecting rod 22, so that the valve flap 21 can be indirectly controlled to open or close the main valve through-hole 10a by pushing the first pusher 23 and the second pusher 24. When the pressure in the pushing through-hole 25a is greater than the pressure relief 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 communicated with the closed space 24a. Then, the high-temperature and high-pressure gas in the closed space 24a pushes the second pusher 24 to move towards the valve flap 21, and further the valve flap 21 opens the main valve through-hole 10a, thereby relieving the pressure; when the pressure in the pushing through-hole 25a is less than the pressure relief 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 a spring and provides a preset force at the same time, the above solution can be used in different working environments so that its pressure relief pressure is not affected by temperature. And in the pilot-operated pressure relief valve with a spring, the 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 medium temperature.

[0050] In some embodiments, please refer to Figures 1 to 3 together. The conversion part 25 includes a conversion main body 251 and a first switch member 252. Among them:

[0051] The conversion main body 251 is located in the closed space 24a. One end of the conversion main body 251 is connected to one end of the branch pipe 30. The conversion main body 251 has a pushing through-hole 25a; the conversion main body 251 is provided with a communication hole 251a, and the communication hole 251a connects the closed space 24a with the pushing through-hole 25a; a preset space 251b is provided on the side wall of the communication hole 251a, and the preset space 251b is isolated from the pushing through-hole 25a.

[0052] The first switch member 252 is movably arranged in the preset space 251b; and the first switch member 252 is hermetically arranged with the side wall of the preset space 251b.

[0053] Among them, when the pressure in the communication hole 251a is greater than the warning pressure, the high-temperature and high-pressure gas in the communication hole 251a pushes the first switch member 252 to move away from the communication hole 251a, so that the closed space 24a is communicated with the pushing through-hole 25a through the communication hole 251a; when the pressure in the communication hole 251a is less than the warning pressure, the first switch member 252 moves towards the communication hole 251a to close the communication hole 251a, thereby disconnecting the communication relationship between the closed space 24a and the pushing through-hole 25a.

[0054] It can be understood that the conversion body 251 and the first switching member 252 are components for controlling the communication between the closed space 24a and the pushing through-hole 25a; for example, the conversion body 251 can be a metal box body composed of a metal plate provided with a heat insulation layer (such as an aluminum foil layer or a glass wool layer, etc.). For example, the first switching member 252 can be a metal block or a metal piston provided with a heat insulation layer (such as an aluminum foil layer or a glass wool layer, etc.). The warning pressure is the critical pressure for the conversion part 25 to open or close the communication hole 251a. For example, when the pneumatic automatic pressure relief valve 100 works in a chemical pipeline, the critical pressure is between 80% and 90% of the designed pressure of the chemical pipeline; those skilled in the art can set it according to actual needs and it is not uniquely limited here.

[0055] With such a setting, by arranging the conversion body 251 to partially close the connection between the closed space 24a and the pushing through-hole 25a and leaving a small part of controllable communication hole 251a, the first switching member 252 can then open or close the communication hole 251a, thereby controlling the communication relationship between the closed space 24a and the pushing through-hole 25a. Compared with the scheme of directly cooperating with an elastic element and the first switching member 252, where the elastic element connects one end of the first switching member 252 to the inner wall of the pushing through-hole 25a and the first switching member 252 is movably located in the pushing through-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 and lengthening the working duration of the conversion part 25.

[0056] Optionally, in some embodiments, please refer to 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 pushing member 23; the pneumatic automatic pressure relief valve 100 further includes a second switching 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 less than the volume of the liquid storage hole 22a. The second switching member 40 is movably arranged in the liquid storage hole 22a, and the second switching member 40 is hermetically arranged in the liquid storage hole 22a to isolate the liquid 50 from the external space; the conversion part 25 further includes a connecting pipe 253. One end of the connecting pipe 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 pipe 253.

[0057] It can be understood that the second switching member 40 is a component for isolating the liquid 50 from the external space; for example, the second switching member 40 can be a metal block or a metal piston, etc. The connecting pipe 253 is a component for communicating the preset space 251b with the liquid storage hole 22a. The liquid 50 can be mercury or silicone oil, etc.

[0058] Set up like this, the preset space 251b is connected to the liquid storage hole 22a through the connecting pipe 253, so that the liquid 50 can move freely between the preset space 251b and the liquid storage hole 22a. The liquid 50 is isolated from the external space through the second switch member 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 member 40 provide pressure on the side of the first switch member 252 facing away from the communication hole 251a, so that the first switch member 252 can close the communication hole 251a when the pressure in the communication hole 251a is less than the warning pressure; and enable the first switch member 252 to open the communication hole 251a when the pressure in the communication hole 251a is greater than the pressure relief pressure (the pressure relief pressure is greater than the warning pressure), and then perform the pressure relief operation. Compared with the scheme of directly supplying gas to and discharging gas from the preset space 251b through the gas supply device, the influence of the change in the temperature of the liquid 50 on the volume in the above scheme is very small, while the influence of the change in the temperature of the gas on the volume is very large, thus reducing the influence of temperature on the pressure relief pressure; and if an inflation device is used, it is necessary to involve a pressure sensor and a single-chip microcomputer, etc. The above scheme can reduce the manufacturing cost, maintenance cost and service life of the pneumatic automatic pressure relief valve 100.

[0059] Optionally, please refer to Figures 1 to 3 , the connecting pipe 253 includes a first right-angle elbow 2531 and a second right-angle elbow 2532; one end of the first right-angle elbow 2531 is arranged on the connecting rod 22, and the internal space of the first right-angle elbow 2531 is communicated with the liquid storage hole 22a; one end of the second right-angle elbow 2532 is arranged on the conversion body 251, and the internal space of the second right-angle elbow 2532 is communicated with the preset space 251b, and the other end of the second right-angle elbow 2532 is movably and sealingly arranged in the first right-angle elbow 2531.

[0060] Set up like this, the length of the connecting pipe 253 is set to be greater than the distance between the connecting rod 22 and the conversion body 251, so that the connecting pipe 253 can adapt to the new distance between the connecting rod 22 and the conversion body 251 generated by the movement of the connecting rod 22; and because the length of the connecting pipe 253 is set to be greater than the distance between the connecting rod 22 and the conversion body 251, the connecting pipe 253 needs to be set as a bendable metal bellows.

[0061] Exemplarily, please refer to Figure 1 , the projected area of the second pushing member 24 on the plane perpendicular to its moving direction is greater than the total projected area of the first pushing member 23 and the valve flap 21 on the same plane. When the pressure in the closed space 24a is greater than the pressure relief pressure, the valve flap 21 opens the main valve through-hole 10a; and the pressure relief pressure is greater than the warning pressure.

[0062] With such a setting, 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, such that when the pressure received by the first pusher 23, the second pusher 24, and the valve flap 21 is the same, the total pressure of the first pusher 23, the second pusher 24, and the valve flap 21 is directed towards the pipeline or the pressure vessel. By setting the pressure relief pressure to be larger than the warning pressure, and the pressure relief pressure being the designed pressure of the pneumatic automatic pressure relief valve 100, such that the pneumatic automatic pressure relief valve 100 can have two critical pressures, where the smaller critical pressure is used to remind the staff, and the other larger critical pressure is used to automatically open the pneumatic automatic pressure relief valve 100, thereby protecting the pipeline or the pressure vessel protected by the pneumatic automatic pressure relief valve 100.

[0063] In some embodiments, refer to Figures 1 to 3 , on the side wall of the conversion body 251 close to the first pusher 23, a connection port 251c is provided, and the connection port 251c connects the communication hole 251a with the closed space 24a; the first pusher 23 has a return push end 231, and the return push end 231 is movably arranged in the connection port 251c and extends into the preset space 251b, and the return push end 231 is hermetically arranged in the connection port 251c.

[0064] With such a setting, when the pressure in the push through hole 25a is less than the warning pressure, the first switch member 252 moves towards the first pusher 23, thereby closing the communication hole 251a, and discharging the liquid 50 in the closed space 24a through the first pusher 23, thereby enabling the gas in the communication hole 251a to push the first pusher 23 to move away from the valve flap 21, thereby closing the main valve through hole 10a. The above solution can enable the main valve through hole 10a to be closed only when the pressure in the communication hole 251a is less than the warning pressure.

[0065] Optionally, in some embodiments, refer to Figure 1 and Figure 2 , the first pusher 23 is provided with a pressure relief hole 23a; when the pressure in the communication hole is less than the warning pressure, the closed space 24a is connected to the liquid storage hole 22a through the pressure relief hole 23a; when the pressure in the communication hole 251a is greater than the warning pressure, the pressure relief hole 23a is closed, so as to isolate the closed space 251b from the liquid storage hole 22a.

[0066] With such a setting, the vent hole 23a is provided to connect the closed space 24a with the liquid storage hole 22a, 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 providing the second switching member 40, the second switching member 40 can open or close the vent hole 23a, so that the closed space 24a can play a role of storing gas or discharging gas. Compared with the scheme of separately providing the vent hole 23a, the above scheme associated with the second switching member 40 can ensure that the vent hole 23a is opened when the pressure in the main valve through-hole 10a is less than the vent pressure; and can ensure that the vent hole 23a is closed when the pressure in the main valve through-hole 10a is greater than the vent pressure.

[0067] Optionally, referring to Figures 1 to 3 , the pneumatically controlled automatic pressure relief valve 100 further includes a plurality of high-temperature resistant seals 60. The seals 60 are arranged on the inner sidewall of the liquid storage hole 22a, and at least one seal 60 is respectively arranged on both sides of the communication part between the vent hole 23a and the liquid storage hole 22a.

[0068] It can be understood that the seal 60 is a circular seal, which can be a polytetrafluoroethylene (PTFE) seal, a metal wound gasket or a ceramic fiber packing, etc.

[0069] With such a setting, at least one seal 60 is respectively arranged on both sides of the communication part between the vent hole 23a and the liquid storage hole 22a, so that when the second switching member 40 closes the vent hole 23a, the vent hole 23a can be isolated from the external space and the vent hole 23a can be isolated from the liquid 50; when the second switching member 40 opens the vent hole 23a, the vent hole 23a can be isolated from the liquid 50. Compared with the scheme of directly arranging the seal 60 on the sidewall of the second switching member 40, the above scheme can prevent the seal 60 from getting stuck in the vent pipe.

[0070] In some embodiments, referring to Figures 1 to 3 , a plurality of seals 60 are arranged on the sidewalls of the first pushing member 23 and the second pushing member 24, and at least one seal 60 is also arranged on the sidewall of the valve flap 21 facing the second pushing member 24.

[0071] With such a setting, a plurality of seals 60 are respectively arranged on the sidewalls of the first pushing member 23 and the second pushing member 24, and at least one seal 60 is arranged on the sidewall of the valve flap 21 facing the second pushing member 24 to ensure the internal sealing performance during the working process.

[0072] In some embodiments, referring to Figure 1 and Figure 2 , the second switching member 40 has a protruding end 41, and the protruding end 41 is located on the side of the second switching member 40 facing away from the second pushing member 24.

[0073] With such a setting, when the pressure in the closed space 24a is greater than the warning pressure, the protruding end 41 extends out of the mounting hole 10c for easy viewing by the staff; when the pressure in the closed space 24a is less than the warning pressure, the protruding end 41 retracts into the mounting hole 10c. This facilitates the staff to adjust the pressure in the pipeline.

[0074] In some embodiments, referring to Figures 1 to 3 , the pneumatic automatic pressure relief valve 100 further includes a partition member 70 having a switch hole 70a. The partition member 70 is disposed in the main valve through hole 10a, and the partition member 70 divides the main valve through hole 10a into an exhaust hole 100a and a connection hole 101a. The connection hole 101a is in communication with the pipeline, the exhaust hole 100a is in communication with the external space, and the switch hole 70a connects the exhaust hole 100a and the connection hole 101a; the valve flap 21 is located in the connection hole 101a.

[0075] In some embodiments, referring to Figures 1 to 3 , a scale is provided on the protruding end 41 to enable detection of the height of the liquid in the liquid storage hole 22a; the pneumatic automatic pressure relief valve 100 further 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 members 80 are detachably disposed on the protruding end 41, and the pressure relief adjustment members 90 are detachably disposed on the first pushing member 23.

[0076] It can be understood that the warning adjustment member 80 is a component for adjusting the warning pressure of the pneumatic 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 for adjusting the pressure relief pressure of the pneumatic automatic pressure relief valve 100; for example, the pressure relief adjustment member 90 can be a metal block or a metal counterweight, etc.

[0077] With such a setting, since the pneumatic automatic pressure relief valve 100 has many application scenarios, the required warning pressure and pressure relief pressure are different. However, the pressure relief pressure of the conventional pneumatic automatic pressure relief valve 100 is fixed and cannot adapt to application scenarios with different warning pressures and pressure relief pressures. The above solution can change to the required warning pressure by increasing or decreasing the warning adjustment member 80; and by increasing or decreasing the pressure relief adjustment member 90, the required pressure relief pressure can be changed; thereby enabling the pneumatic automatic pressure relief valve 100 to adapt to different application places.

[0078] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A pneumatically controlled automatic pressure relief valve, characterized in that, 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 in communication with the branch port and the mounting hole; A control unit including a valve flap, a connecting rod, a first pusher, a second pusher, and a conversion unit without a spring; the valve flap is movably disposed within the main valve through-hole and is connected to the first pusher and the second pusher through the connecting rod, and the first pusher and the second pusher are slidably connected to the inner wall of the mounting hole; a closed space is formed by the first pusher, the second pusher, and the side wall of the mounting hole, the conversion unit is located within the closed space, the conversion unit has a pushing through-hole, and the first pusher is movably disposed within 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 pushing through-hole; Wherein, the conversion unit is configured to communicate the pushing through-hole with the closed space, so as to open the main valve through-hole by the valve flap; the conversion unit is further configured to disconnect the communication between the pushing through-hole and the closed space, so as to close the main valve through-hole by the valve flap; The conversion unit includes: A conversion body located within the closed space, one end of the conversion body is connected to one end of the branch pipe, and the conversion body has the pushing through-hole; a communication hole is formed in the conversion body, and the communication hole communicates the closed space with the pushing through-hole; a preset space is formed in the side wall of the communication hole, and the preset space is isolated from the pushing through-hole; and A first switch member movably disposed within the preset space and hermetically disposed between the first switch member and the side wall of the preset space; Wherein, when the pressure within the communication hole is greater than the pressure release pressure, the high-temperature and high-pressure gas within the communication hole pushes the first switch member to move away from the communication hole, so that the closed space is communicated with the pushing through-hole through the communication hole; when the pressure within the communication hole is less than the pressure release pressure, the first switch member moves towards the communication hole to close the communication hole, thereby disconnecting the communication relationship between the closed space and the pushing through-hole.

2. The pneumatically controlled automatic pressure relief valve according to claim 1, wherein: The connecting rod has a liquid storage hole, and the opening direction of the liquid storage hole is close to the first pusher; the pneumatic automatic pressure relief valve further includes a second switch member and a liquid, the liquid is placed within the liquid storage hole, and the volume of the liquid is less than the volume of the liquid storage hole, the second switch member is movably disposed within the liquid storage hole and is hermetically disposed within the liquid storage hole to isolate the liquid from the external space; the conversion unit further includes a connecting pipe, one end of the connecting pipe 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 pipe.

3. The pneumatically controlled automatic pressure relief valve according to claim 2, characterized in that: The connecting pipe includes a first right-angle elbow and a second right-angle elbow; one end of the first right-angle elbow is arranged on the connecting rod, and the inner space of the first right-angle elbow is communicated with the liquid storage hole; one end of the second right-angle elbow is arranged on the conversion body, and the inner space of the second right-angle elbow is communicated with the preset space, and the other end of the second right-angle elbow is movably and sealingly arranged in the first right-angle elbow.

4. The pneumatically controlled automatic pressure relief valve according to claim 2, wherein: The projected area of the second pushing member on a plane perpendicular to its moving direction is greater than the total projected area of the first pushing member and the valve flap on the plane.

5. The pneumatically controlled automatic pressure relief valve according to claim 1, wherein: A connection port is formed in the side wall of the conversion body close to the first pushing member, and the connection port communicates the communication hole with the closed space; the first pushing member has a return pushing end, the return pushing end is movably arranged in the connection port and extends into the preset space, and the return pushing end is sealingly arranged in the connection port.

6. The pneumatically controlled automatic pressure relief valve according to claim 2, characterized in that: The first pushing member is provided with an air vent hole; when the pressure in the communication hole is less than the warning pressure, the closed space is communicated with the liquid storage hole through the air vent hole; when the pressure in the communication hole is greater than the warning pressure, the air vent hole is closed to isolate the closed space from the liquid storage hole.

7. The pneumatically controlled automatic pressure relief valve according to claim 6, characterized in that: The pneumatic automatic pressure relief valve further includes a plurality of high-temperature resistant seals, the seals are arranged on the inner side wall of the liquid storage hole, and there is at least one seal on each side of the connection between the air vent hole and the liquid storage hole.

8. The pneumatically controlled automatic pressure relief valve according to claim 7, wherein: A plurality of the seals are arranged on the side walls of the first pushing member and the second pushing member, and at least one of the seals is further arranged on the side wall of the valve flap facing the second pushing member.

9. The pneumatically controlled automatic pressure relief valve according to claim 4, characterized in that: The second switching member has a protruding end, and the protruding end is located on the side of the second switching member facing away from the second pushing member.

Images