CN212028659U

CN212028659U - Anti-blocking explosion-proof valve

Info

Publication number: CN212028659U
Application number: CN202020603889.3U
Authority: CN
Inventors: 刘向民; 曹四峰; 李鹏飞; 余海龙; 温科桂
Original assignee: Dongguan Puw Eptfe Material Co ltd
Current assignee: Dongguan Puw Eptfe Material Co ltd
Priority date: 2020-04-21
Filing date: 2020-04-21
Publication date: 2020-11-27
Anticipated expiration: 2030-04-21

Abstract

The utility model discloses an anti-blocking explosion-proof valve, which comprises a piston, a valve body, a spring and a connecting shaft, wherein a first through hole is arranged through the connecting shaft, and a protective cover is arranged on the valve body around the outer side of the spring; the valve body comprises a plurality of first air leakage gaps which are arranged corresponding to the protective cover, and a first air hole is formed in a cavity between each first air leakage gap and the protective cover; the piston comprises a piston body, a breathable membrane and an upper cover, the piston body is longitudinally penetrated to correspond to the first through hole, a second through hole is formed in the first through hole, the second through hole is horizontally penetrated, a plurality of through grooves are connected to the second through hole, and a second breathable hole is formed in a cavity between each through groove and the upper cover. The utility model discloses a be provided with the protection casing in the outside of spring, block effectively that burning eruption article are gathered, the adhesion shortens the compression stroke of spring on the spring to avoid influencing opening effect and the exhaust pressure release efficiency of explosion-proof valve.

Description

Anti-blocking explosion-proof valve

Technical Field

The utility model relates to an explosion-proof valve technical field, concretely relates to prevent explosion-proof valve of jam.

Background

The power battery pack is used as the core of the new energy electric automobile, and the safety and the working reliability of the power battery pack are very important. In order to ensure the safe and stable operation, the battery needs to be waterproof and dustproof, namely, the battery pack needs to meet the sealing requirement. However, in a completely sealed state, once the battery is abnormally thermally out of control, such as short circuit, overshoot or overdischarge, high temperature and high pressure are generated, a large amount of burning eruptions containing solid or colloidal substances are generated, and if the burning eruptions cannot be discharged in time, severe explosion and ignition can be generated under normal conditions, so that serious casualties and property loss are caused. It is currently common practice to install 1 or more explosion-proof vent valves on a battery pack in order to prevent the battery pack from rapidly exploding when an abnormal situation occurs, and to provide an opportunity for a person to escape, thereby mitigating the loss of persons and property due to the explosion of the battery pack. In addition, the existing explosion-proof valve is easy to drop and fail accidentally when violent explosion and fire happen, so that short circuit of the battery cell in the battery pack or other accidents happen, and further severity of accidents is aggravated. Similarly, a sealed box body with a large capacitor and an energy storage battery inside and a sealed container and a storage tank with volatile chemicals have similar problems, and an explosion-proof valve is also required to be arranged on the sealed box body or the container.

Most are spring control explosion-proof valve among the prior art, thereby its theory of operation relies on accurate spring control explosion-proof valve case to open exhaust pressure release, it is higher to have explosion-proof pressure precision, pressure can adjust advantages such as required conveniently, but if when the battery package explodes, the burning eruption article are gathered, the adhesion is opened the stroke to explosion-proof valve case when going up the spring and has certain influence, lead to later stage case to open high comparison earlier stage has the part to reduce, thereby influence the exhaust pressure release speed of explosion-proof valve.

The explosion-proof valve in the prior art still needs further research and improvement. Therefore, how to provide an explosion-proof valve which prevents the spring from being blocked by the accumulation of combustion eruptions to influence the normal opening of the valve core on the premise of maintaining good exhaust performance becomes a main technical problem existing in the current explosion-proof valve production field.

SUMMERY OF THE UTILITY MODEL

In order to overcome the technical problem, the utility model discloses a prevent explosion-proof valve of jam.

The utility model discloses a realize that the technical scheme that above-mentioned purpose adopted is:

an anti-blocking explosion-proof valve comprises a piston, a valve body, a spring and a connecting shaft, wherein the connecting shaft penetrates through the spring and the valve body in sequence and is connected with the piston;

the valve body comprises a plurality of first air leakage gaps which are arranged corresponding to the protective cover, and a first air hole is formed in a cavity between each first air leakage gap and the protective cover;

a center hole for the connecting shaft to penetrate is formed in the center of the valve body in a longitudinal penetrating mode, a protective cover fixing groove is annularly arranged on the valve body around the center hole, and a valve body fixing protrusion is annularly arranged on the inner side face of the protective cover corresponding to the protective cover fixing groove in a matched mode.

The piston comprises a piston body, a breathable membrane and an upper cover, a second through hole is longitudinally arranged through the piston body corresponding to the first through hole, the second through hole is connected with a plurality of through grooves in a surrounding and horizontal penetrating mode, and a second breathable hole is formed in a cavity between the through grooves and the upper cover.

In the anti-clogging anti-explosion valve, the piston body is arranged on the valve body, and a plurality of exhaust holes are formed in the valve body around the central hole.

Foretell explosion-proof valve who prevents blockking up, wherein piston body invagination forms the confession the diaphragm standing groove that ventilative diaphragm placed, in interference fit is equipped with the diaphragm clamping ring in the diaphragm standing groove, in the diaphragm clamping ring with it opens the piece to be equipped with the case between the upper cover, the case is opened the piece and is corresponded the second bleeder vent is provided with the second and loses heart breach and at least in arbitrary the edge of the breach is lost heart to the second corresponds it is protruding to be provided with to lead to the groove to be no less than a location, the second through-hole vertically runs through the diaphragm standing groove, just it link up to lead to the groove level the diaphragm standing groove, the degree of depth that leads to the groove is less than the degree of.

In the anti-clogging explosion valve, the piston body is provided with a plurality of first fixing grooves around the diaphragm placing groove, a second fixing groove is arranged around the outermost first fixing groove, the width of the second fixing groove is larger than that of the first fixing groove, and the first fixing groove and the second fixing groove are both provided with bonding layers for fixing the piston body and the valve body.

In the anti-blocking explosion-proof valve, the upper end surface of the valve body is annularly provided with a first sealing ring placing groove corresponding to the piston body, the lower end surface of the valve body comprises a second sealing ring placing groove annularly provided with the exhaust hole, and the first sealing ring placing groove and the second sealing ring placing groove are respectively provided with a first sealing ring and a second sealing ring in an interference fit manner.

In the anti-blocking explosion-proof valve, the protective cover is further provided with a flange, and the valve body is provided with a flange fixing protrusion corresponding to the flange.

The anti-blocking explosion-proof valve is characterized in that the valve body is provided with an installation part for installing the explosion-proof valve, and the valve body is annularly provided with an annular airtight tool groove.

In the anti-clogging explosion-proof valve, the mounting part extends to the outside of the valve body; or the mounting part is arranged on the valve body corresponding to the exhaust hole.

The utility model has the advantages that:

(1) the utility model discloses a through be provided with the protection casing in the outside of spring, block effectively that burning eruption article are gathered, the adhesion shortens the compression stroke of spring on the spring to avoid influencing explosion-proof valve's opening effect and exhaust pressure release efficiency, can also prevent effectively in addition that the case from opening when losing heart, burning eruption article are gathered, the adhesion on the spring, lead to the case can't reset after exhaust pressure release and seal once more and waterproof, separate oxygen fire-retardant; the protective covers with different shapes and sizes can be flexibly selected according to the requirements of different explosion-proof valve products;

(2) the utility model adopts the first air hole, the second air hole and the exhaust hole in a combined manner, thereby realizing the timely gas exchange through the inner air leakage path of the explosion-proof valve in a normal state, maintaining good exhaust performance and playing a role in balancing the internal pressure and the external pressure; continuously, stably and efficiently exhausting and releasing pressure through an external air release path of the explosion-proof valve and an internal air release path of the explosion-proof valve in an explosion-proof state, so that the exhaust capacity and effect are further improved;

(3) under the matching of the protective cover fixing groove and the valve body fixing bulge, the protective cover is prevented from rotating and falling off, so that the short circuit of a battery core in the battery pack or other accidents are avoided, and the mounting firmness is improved;

(4) by installing the first sealing ring and the second sealing ring, the air leakage inside the explosion-proof valve and between the explosion-proof valve and the battery pack is effectively prevented;

(5) the parts are prepared from the aluminum alloy material or the stainless steel material, so that the production cost is reduced while various tolerance environmental indexes of the product are met, and the preparation method is simple to operate, convenient and firm to assemble and capable of realizing mass production;

(6) the explosion-proof valve needs to be subjected to inspection procedures such as a first waterproof test, a second waterproof test, a permeability test, an explosion-proof pressure test, an appearance detection and the like, and the waterproof performance, the sealing performance, the high permeability and the good explosion-proof performance of the explosion-proof valve are strictly controlled, so that the advantage of high quality is achieved.

Drawings

The present invention will be further explained with reference to the drawings and examples.

Fig. 1 is a schematic perspective view of embodiment 1 of the present invention;

fig. 2 is a schematic perspective view of embodiment 1 of the present invention;

fig. 3 is an exploded view of embodiment 1 of the present invention;

fig. 4 is an exploded schematic view of a piston according to embodiment 1 of the present invention;

fig. 5 is a schematic perspective view of a valve body according to embodiment 1 of the present invention;

fig. 6 is a schematic cross-sectional view of a valve body according to embodiment 1 of the present invention;

fig. 7 is a schematic cross-sectional view of the protective cover according to embodiment 2 of the present invention;

fig. 8 is a schematic perspective view of embodiment 3 of the present invention;

fig. 9 is a schematic perspective view of embodiment 4 of the present invention;

FIG. 10 is a schematic view of the venting balance pressure of the explosion-proof valve of the present invention in a normal state;

fig. 11 is a schematic view of the venting and pressure relief of the explosion-proof valve in the explosion-proof state.

Detailed Description

The present invention will be further described with reference to the following embodiments, so that the technical solution of the present invention can be more easily understood and grasped, rather than being limited to the present invention.

Example 1: referring to fig. 1 to 6, the anti-clogging explosion-proof valve provided in this embodiment includes a piston 1, a valve body 2, a spring 3, and a connecting shaft 4 sequentially penetrating through the spring 3 and the valve body 2 and connected to the piston 1, wherein a first through hole is formed through the connecting shaft 4, a protective cover 5 is installed on the valve body 2 around the outer side of the spring 3, and one end of the protective cover 5 away from the valve body 2 is a sealing end; specifically, the piston 1 is connected with the connecting shaft 4 through threads, the protective cover 5 is mounted on the valve body 2 in an interference fit or press rivet connection mode, the protective cover 5 with different external dimensions is flexibly selected according to requirements of different explosion-proof valve products, and the spring 3 and the connecting shaft 4 are both arranged in the protective cover 5 in a covering mode, so that the protective cover 5 effectively prevents combustion eruptions from accumulating and adhering to the spring 3 to shorten the compression stroke of the spring 3, and further the opening effect and the exhaust and pressure relief efficiency of the explosion-proof valve are prevented from being influenced; wherein the spring 3 is a compression spring, and the spring stiffness of the compression spring is 0.5-5N/mm;

the valve body 2 comprises a plurality of first air leakage gaps 21 which are arranged corresponding to the protective cover 5, and a first air hole is formed in a cavity between each first air leakage gap 21 and the protective cover 5;

the piston 1 comprises a piston body 11, a breathable membrane 12 and an upper cover 13, a second through hole 111 is longitudinally arranged through the piston body 11 corresponding to the first through hole, a plurality of through grooves 112 are connected around and horizontally penetrate through the second through hole 111, and a second breathable hole is formed in a cavity between the through grooves 112 and the upper cover 13; referring to fig. 10, the gas enters the protective cover 5 through the first vent hole, and is discharged through the first through hole, the second through hole 111, the through groove 112 and the second vent hole in sequence, so as to form an internal venting path of the explosion-proof valve, perform gas exchange in time, maintain good exhaust performance, and play a role in balancing internal and external pressures.

Preferably, the piston body 11 is disposed on the valve body 2, a central hole for the connection shaft 4 to pass through is longitudinally formed through the center of the valve body 2, and a plurality of exhaust holes 22 are formed in the valve body 2 around the central hole; specifically, the valve body 2 is convexly formed into a piston placing groove, and the piston body 11 is placed in the piston placing groove; referring to fig. 10 and 11, the explosion-proof valve is mounted on a battery pack, and in a normal state, due to the action of the spring 3, the piston body 11 is placed in the piston placing groove to block the exhaust hole 22 from exhausting; under explosion-proof state, a large amount of gas via the exhaust hole 22 jacking is played discharge behind the piston body 11 to form the outer route of leaking of explosion-proof valve, simultaneously gas also discharges via the outer route of leaking of explosion-proof valve, realizes quick exhaust pressure release, exhaust ability and effectual, wherein normal condition indicates state when there is pressure differential and pressure differential to be less than predetermined explosion-proof pressure inside and outside the battery package, explosion-proof state indicates state when there is pressure differential and pressure differential to be greater than predetermined explosion-proof pressure inside and outside the battery package.

Further, the piston body 11 is recessed to form a membrane placing groove 113 for placing the permeable membrane 12, a membrane pressing ring 14 is arranged in the membrane placing groove 113 in an interference fit manner, a valve core opening piece 15 is arranged between the membrane pressing ring 14 and the upper cover 13, the valve core opening piece 15 can be arranged outside and manually opened by using a magnet to adsorb a valve core, the box body is inflated to detect the air tightness of the box body, the valve core opening piece 15 is provided with a second air leakage notch 151 corresponding to the second air leakage, at least one positioning protrusion 152 is arranged at the edge of any one second air leakage notch 151 corresponding to the through groove 112, the second through hole 111 longitudinally penetrates through the membrane placing groove 113, the through groove 112 horizontally penetrates through the membrane placing groove 113, and the depth of the through groove 112 is smaller than that of the membrane placing groove 113; specifically, a positioning protrusion 152 is disposed at the edge of one of the second air-release notches 151 corresponding to the through groove 112, or two positioning protrusions 152 are disposed at the edge of one of the second air-release notches 151 corresponding to the through groove 112, or a positioning protrusion 152 is disposed at the edge of each of the second air-release notches 151 corresponding to the through groove 112, and the like, which belong to the arrangement mode of the positioning protrusion 152 included in the present invention; the valve core opening piece is a metal piece capable of being adsorbed by a magnet, such as an iron piece, a nickel piece and the like, when the valve core opening piece 15 is assembled, the positioning bulge 152 is positioned in the second through hole, so that the circular valve core opening piece 15 is effectively prevented from rotating circumferentially, the second air leakage notch 151 is ensured to be aligned with the second air vent, and a good fool-proof effect is achieved; the diaphragm clamping ring 14 is used for tightly pressing the breathable diaphragm 12 into the diaphragm placing groove 113, an air containing cavity is formed among the breathable diaphragm 12, the diaphragm clamping ring 14 and the valve core opening piece 15, and the through groove 112, the air containing cavity and the second exhaust hole 22 are communicated with one another, so that air can enter and exit conveniently, the balance of the internal pressure and the external pressure of the explosion-proof valve can be maintained, and meanwhile, the air can be continuously, stably and efficiently exhausted and decompressed in an explosion-proof state.

Preferably, a plurality of first fixing grooves 114 are formed on the piston body 11 around the diaphragm placing groove 113, a plurality of second fixing grooves 115 are formed around the outermost first fixing grooves 114, the width of each second fixing groove 115 is greater than that of each first fixing groove 114, an adhesive layer for fixing the piston body 11 and the valve body 2 is disposed in each of the first fixing grooves 114 and the second fixing grooves 115, specifically, the adhesive layer is cured by an adhesive, the adhesive layer is used for improving the fixing and bonding strength between the piston body 11 and the upper cover 13, and the width of each second fixing groove 115 is greater than that of each first fixing groove 114, that is, the second fixing grooves 115 can contain excess adhesive to prevent the adhesive from overflowing onto the valve body 2.

Preferably, a first sealing ring placement groove 161 is annularly arranged on the upper end surface of the valve body 2 corresponding to the piston body 11, and the lower end surface of the valve body 2 covers the exhaust hole 22 and is annularly provided with a second sealing ring placement groove 171, the first sealing ring placement groove 161 and the second sealing ring placement groove 171 are respectively provided with a first sealing ring 16 and a second sealing ring 17 in an interference fit manner, the first sealing ring 16 is used for preventing air leakage between the valve body 2 and the piston body 11 under a normal state, and the second sealing ring 17 is used for preventing air leakage between the valve body 2 and a battery pack.

Preferably, a protective cover fixing groove 51 is annularly arranged on the valve body 2 around the central hole, and a valve body fixing protrusion is adaptively annularly arranged on the inner side surface of the protective cover 5 corresponding to the protective cover fixing groove 51; the protection cover fixing groove 51 and the valve body fixing protrusion are matched to prevent the protection cover 5 from rotating and falling off, and the installation firmness is improved.

Preferably, the valve body 2 is provided with a mounting part 6 for mounting the explosion-proof valve; specifically, installation department 6 is equipped with 2 altogether, and 2 installation department 6 extend respectively set up in the both sides of valve body 2, installation department 6 is the counter sink, can use the bolt will on the battery package is installed to the explosion-proof valve, be convenient for with the battery package on rivet the pull rivet or the cooperation of rivet nut.

The preparation method of the anti-blocking explosion-proof valve comprises the following steps:

processing an aluminum alloy material into a piston body, a diaphragm pressing ring, a valve body and a connecting shaft semi-finished product according to a required structure and size, and performing anodic oxidation surface treatment to obtain the piston body 11, the diaphragm pressing ring 14, the valve body 2 and the connecting shaft 4; performing sand blasting treatment before performing anodic oxidation surface treatment according to actual production requirements, wherein the sand blasting granularity is 20-200 meshes; after the surface treatment of anodic oxidation, the thickness of the anodic oxidation layer on the surfaces of the piston body 11, the diaphragm pressure ring 14, the valve body 2 and the connecting shaft 4 is 1-10 μm, and in addition, the machining processes such as CNC, numerically controlled lathe, drilling machine and the like are adopted for machining;

according to actual production requirements, the protective cover 5 is manufactured by adopting die stamping, stretch forming or metal pipe welding processing forming;

the upper cover 13 and the valve core opening sheet 15 are made of metal or plastic materials through stamping or laser cutting, sand blasting and anodic oxidation treatment; or the upper cover 13 and the valve core opening sheet 15 are made of metal materials subjected to sand blasting and anodic oxidation by stamping or laser cutting;

selecting a breathable film, manufacturing the breathable film 12 by adopting die cutting or laser cutting, placing the breathable film 12 in the film placing groove 113 of the piston body 11, and pressing the breathable film into the film pressing ring 14;

adhering the upper cover 13 to the piston body 11 pressed into the diaphragm pressing ring 14 by using an adhesive to manufacture the piston 1; the adhesive can be solidified by standing at room temperature in the bonding process, and can also be solidified by accelerating the adhesive at high temperature;

respectively installing a first sealing ring 16 and a second sealing ring 17 in a first sealing ring placing groove 161 and a second sealing ring placing groove 171 of the valve body 2, coating thread locking glue on the connection part of the connecting shaft 4 and/or the piston body 11, and sequentially passing the connecting shaft 4 through the spring 3 and the valve body 2 to be fixedly connected with the piston body 11; specifically, the connecting shaft 4 is in threaded connection with the piston body 11, and the thread locking torque is 0.5-5 N.m; the use of the thread locking agent can further enhance the strength and durability of the fixed edge joint and prevent the threads from loosening;

and sleeving the protective cover 5 on the protective cover fixing groove 51 of the valve body 2, and fixing by adopting a dotting, rolling or stamping process to finally obtain the explosion-proof valve.

Preferably, after the pressing of the diaphragm pressing ring 14, the method further includes: carrying out a first waterproof test on the piston body 11 pressed into the diaphragm pressing ring 14; selecting waterproof test pressure between 10kPa and 50kPa according to different waterproof grades, testing for more than or equal to 20s, testing whether the piston body 11 pressed into the diaphragm compression ring 14 is qualified or not through a first waterproof test, and quickly drying the piston body 11 by a heating baking method after the first waterproof test;

after the explosion-proof valve is manufactured, the method further comprises the following steps: carrying out a second waterproof test, a second air permeability test, a second explosion-proof pressure test and a second appearance test; the second waterproof test is used for checking whether the sealing of the sealing ring is good, the experimental conditions of the second waterproof test are the same as those of the first waterproof test, and the experimental conditions of the second waterproof test can be adjusted according to actual test requirements; testing the air permeability of the explosion-proof valve by using air permeability testing equipment, wherein the testing pressure is 1-20kPa, and the testing time is 1-60 s; and the explosion-proof pressure test adopts explosion-proof pressure test equipment to test the explosion-proof opening pressure of the explosion-proof valve, and the test beat is 20-300 s.

Further, before appearance detection is performed, a marking process is performed on the explosion-proof valve, specifically, one or two methods of laser marking, code spraying, transfer printing or silk printing are selected to make product marks on the explosion-proof valve, for example: and characters or patterns such as trademarks, specification models, batch numbers, two-dimensional codes and the like.

Particularly, the explosion-proof valve can be continuously operated by a full-automatic production line or can be intermittently operated by a semi-automatic production device in a sectional manner, and the preparation process has no strict sequence relation, so that the steps are only one optimized combination, and the explosion-proof valve can be prepared by a preparation method according to other combination sequences.

Example 2: referring to fig. 7, the present embodiment is substantially similar to that of embodiment 1, except that the protective cover 5 is further provided with a flange 52, and the valve body 2 is provided with a flange fixing protrusion corresponding to the flange 52; the protection casing 5 install in behind the valve body 2, the fixed arch of turn-ups compresses tightly through the mode of riveting of pressing turn-ups 52 to avoid the protection casing 5 rotates, drops, improves the installation fastness effectively, and the processing cost is low, is convenient for industrialization batch production.

Example 3: referring to fig. 8, the present embodiment is substantially similar to embodiment 1, except that there are 4 mounting portions 6, and the 4 mounting portions 6 are respectively extended and disposed at intervals outside the valve body 2, and an annular airtight tool groove 7 is annularly disposed on the valve body 2.

Example 4: referring to fig. 9, the present embodiment is substantially similar to embodiment 1, except that the mounting portion 6 is disposed on the valve body 2, the number of the mounting portions 6 is 4, the mounting portion 6 is a threaded hole, and an annular airtight tool recess 7 is annularly disposed on the valve body 2.

The utility model has the advantages of it is following:

(1) the utility model effectively prevents the burning eruption from accumulating and adhering on the spring and shortens the compression stroke of the spring by arranging the protective cover outside the spring, thereby avoiding influencing the opening effect and the exhaust and pressure relief efficiency of the explosion-proof valve; the protective covers with different shapes and sizes can be flexibly selected according to the requirements of different explosion-proof valve products;

(2) the utility model adopts the first air hole, the second air hole and the exhaust hole in a combined manner, thereby realizing the timely gas exchange through the inner air leakage path of the explosion-proof valve in a normal state, maintaining good exhaust performance and playing a role in balancing the internal pressure and the external pressure; in addition, combustion eruption is accumulated and adhered to a spring after the valve core is opened, so that the valve core can not be reset and sealed again to prevent water, oxygen and flame retardance after the air is exhausted and the pressure is relieved;

The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention in any way. The technical solution of the present invention can be used by anyone skilled in the art to make many possible variations and modifications, or to modify equivalent embodiments, using the technical means and contents disclosed above, without departing from the scope of the technical solution of the present invention. Therefore, the protection scope of the present invention should be covered by the equivalent changes made according to the shape, structure and principle of the present invention, all without departing from the technical solution of the present invention.

Claims

1. An anti-blocking explosion-proof valve is characterized by comprising a piston, a valve body, a spring and a connecting shaft, wherein the connecting shaft penetrates through the spring and the valve body in sequence and is connected with the piston;

2. The anti-clogging explosion valve according to claim 1, wherein the piston comprises a piston body, a permeable membrane and an upper cover, a second through hole is provided longitudinally through the piston body corresponding to the first through hole, a plurality of through grooves are connected around and horizontally through the second through hole, and a second vent is formed in a cavity between the through grooves and the upper cover.

3. The anti-clog explosion valve according to claim 2, wherein said piston body is disposed on said valve body, and wherein said valve body is provided with a plurality of vent holes around said central bore.

4. The anti-clogging explosion valve according to claim 2, wherein the piston body is recessed to form a membrane accommodating groove for the breathable membrane to be placed, a membrane pressing ring is disposed in the membrane accommodating groove in an interference fit manner, a valve element opening piece is disposed between the membrane pressing ring and the upper cover and corresponds to the second air vent, a second air vent is disposed at least in any one of the edges of the second air vent corresponding to the through groove, at least one positioning protrusion is disposed on the through groove, the second air vent penetrates through the membrane accommodating groove longitudinally, the through groove penetrates through the membrane accommodating groove horizontally, and the depth of the through groove is smaller than that of the membrane accommodating groove.

5. The anti-clogging explosion valve according to claim 4, wherein a plurality of first fixing grooves are annularly formed on the piston body around the diaphragm placing groove, a second fixing groove is annularly formed around the outermost first fixing groove, the width of the second fixing groove is larger than that of the first fixing groove, and an adhesive layer for fixing the piston body and the valve body is respectively arranged in the first fixing groove and the second fixing groove.

6. The anti-clogging explosion-proof valve according to claim 3, wherein a first sealing ring placing groove is formed on the upper end surface of the valve body corresponding to the piston body ring, and a second sealing ring placing groove is formed on the lower end surface of the valve body covering the vent hole ring, and the first sealing ring placing groove and the second sealing ring placing groove are respectively provided with a first sealing ring and a second sealing ring in an interference fit manner.

7. The anti-clog explosion valve according to claim 3, wherein said valve body is convexly formed with a piston receiving groove in which said piston body is received.

8. The anti-clogging explosion-proof valve according to claim 2, wherein the shield is further provided with a flange, and the valve body is provided with a flange fixing protrusion corresponding to the flange.

9. The anti-clogging explosion valve according to claim 7, wherein the valve body is provided with a mounting portion for mounting the explosion valve, and the valve body is annularly provided with an annular airtight tool groove.

10. The anti-clog explosion valve according to claim 9, wherein said mounting portion extends outwardly of said valve body; or the mounting part corresponds to the exhaust hole and is arranged on the valve body, and a through hole, a countersunk through hole or a threaded hole is formed in the mounting part.