WO2020063043A1 - 一种防爆阀芯、含有该阀芯的防爆阀及箱体气密检测夹具 - Google Patents

一种防爆阀芯、含有该阀芯的防爆阀及箱体气密检测夹具 Download PDF

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Publication number
WO2020063043A1
WO2020063043A1 PCT/CN2019/096136 CN2019096136W WO2020063043A1 WO 2020063043 A1 WO2020063043 A1 WO 2020063043A1 CN 2019096136 W CN2019096136 W CN 2019096136W WO 2020063043 A1 WO2020063043 A1 WO 2020063043A1
Authority
WO
WIPO (PCT)
Prior art keywords
explosion
groove
valve core
proof valve
guide post
Prior art date
Application number
PCT/CN2019/096136
Other languages
English (en)
French (fr)
Inventor
刘向民
曹四峰
余海龙
Original Assignee
东莞蒲微防水透气膜材料有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 东莞蒲微防水透气膜材料有限公司 filed Critical 东莞蒲微防水透气膜材料有限公司
Publication of WO2020063043A1 publication Critical patent/WO2020063043A1/zh
Priority to US17/209,143 priority Critical patent/US11817599B2/en

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
    • F16K1/32—Details
    • F16K1/34—Cutting-off parts, e.g. valve members, seats
    • F16K1/36—Valve members
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/233—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by physical properties of casings or racks, e.g. dimensions
    • H01M50/24—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by physical properties of casings or racks, e.g. dimensions adapted for protecting batteries from their environment, e.g. from corrosion
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
    • F16K17/02—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side
    • F16K17/04—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side spring-loaded
    • F16K17/0413—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side spring-loaded in the form of closure plates
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
    • F16K17/02—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side
    • F16K17/164—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side and remaining closed after return of the normal pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
    • F16K17/20—Excess-flow valves
    • F16K17/22—Excess-flow valves actuated by the difference of pressure between two places in the flow line
    • F16K17/24—Excess-flow valves actuated by the difference of pressure between two places in the flow line acting directly on the cutting-off member
    • F16K17/28—Excess-flow valves actuated by the difference of pressure between two places in the flow line acting directly on the cutting-off member operating in one direction only
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K24/00—Devices, e.g. valves, for venting or aerating enclosures
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K31/00—Actuating devices; Operating means; Releasing devices
    • F16K31/02—Actuating devices; Operating means; Releasing devices electric; magnetic
    • F16K31/06—Actuating devices; Operating means; Releasing devices electric; magnetic using a magnet, e.g. diaphragm valves, cutting off by means of a liquid
    • F16K31/08—Actuating devices; Operating means; Releasing devices electric; magnetic using a magnet, e.g. diaphragm valves, cutting off by means of a liquid using a permanent magnet
    • F16K31/084—Actuating devices; Operating means; Releasing devices electric; magnetic using a magnet, e.g. diaphragm valves, cutting off by means of a liquid using a permanent magnet the magnet being used only as a holding element to maintain the valve in a specific position, e.g. check valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K31/00—Actuating devices; Operating means; Releasing devices
    • F16K31/44—Mechanical actuating means
    • F16K31/60—Handles
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M3/00—Investigating fluid-tightness of structures
    • G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/249—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders specially adapted for aircraft or vehicles, e.g. cars or trains
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/30—Arrangements for facilitating escape of gases
    • H01M50/317—Re-sealable arrangements
    • H01M50/325—Re-sealable arrangements comprising deformable valve members, e.g. elastic or flexible valve members
    • H01M50/333—Spring-loaded vent valves
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/30—Arrangements for facilitating escape of gases
    • H01M50/394—Gas-pervious parts or elements
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2200/00—Safety devices for primary or secondary batteries
    • H01M2200/20—Pressure-sensitive devices
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

Definitions

  • the invention relates to the technical field of a sealed box explosion-proof valve and tightness detection, in particular to an explosion-proof valve core, an explosion-proof valve containing the valve core, and a box air-tight detection jig.
  • Sealed boxes such as outdoor electrical control boxes, energy storage battery boxes, electric vehicle battery packs, etc. are the “heart” of related equipment or new energy vehicles. As the core components of control and driving, their safety, stability and reliability of work It directly affects the performance and safety of the equipment or new energy electric vehicles. When the controller box is filled with water, the insulation performance will decrease and cause short circuit and control system failure; for example, water in the battery pack will cause the battery to short circuit, which will cause the battery to explode.
  • the GB 4208-2008 standard specifies the test methods and requirements for IP67 and higher protection levels:
  • the dust test uses talcum powder in the dust test box test, and it is required that there is no dust in the box after the test. Sedimentation; Water resistance test requires immersion in water to a depth of 1 meter, and the test time is at least 30 minutes. Testing according to the above standard methods is complicated and takes a long time. After the test, the box is adhered with water and dust. It needs to be cleaned and dried. The post-test processing is cumbersome. It is only suitable for sampling inspection. It cannot reach the sealed box mass production process. The requirement of rapid detection is to check whether the box is leaking by using inflation or air extraction in the mass production process to verify whether the box is well sealed to verify the protective effect of the box.
  • Drill a threaded hole in the box and connect it with an inflatable connector for testing is fast in gas detection, an additional hole needs to be opened in the box, which increases the processing difficulty of the box, and After passing the inflation test, a bolt is installed to perform secondary plugging and sealing. The secondary sealing effect of the bolt cannot be proved. There is a risk that the secondary sealing of the inflation hole is poor and the protection level is not achieved.
  • the box is inflated through the breathable membrane of the explosion-proof valve, but the breathable volume of the waterproof breathable membrane is generally small, the inflation or extraction speed is very slow, the detection efficiency is low, and the existence of the gas detection from the breathable valve will make the waterproof breathable membrane Risk of damage due to breakage.
  • the present invention provides an explosion-proof valve core.
  • the explosion-proof valve core is provided with a waterproof and breathable membrane, an airflow channel and a metal sheet that can quickly open the explosion-proof valve core.
  • the waterproof and breathable membrane should block water from entering under normal working conditions, but can be bidirectionally ventilated to achieve pressure balance inside and outside the cabinet;
  • the explosion-proof valve core can be opened, quickly inflate or exhaust high-temperature and high-pressure gas, which greatly reduces the possibility of damage to the waterproof and breathable membrane, and can also prevent explosion or reduce the explosion. damage.
  • an explosion-proof valve core which includes a valve core body, a waterproof and breathable diaphragm, a diaphragm fixing member, and a metal piece; A first groove and a second groove sinking relative to the first groove; one end of the valve core ventilation groove communicates with the first groove, and the other end extends to the outside of the valve body; the waterproof and breathable membrane is provided at the first In two grooves, the membrane fixing member is disposed in the second groove and is pressed against the edge of the surface of the waterproof and breathable membrane; the metal sheet is arranged in the first groove.
  • the end surface of the valve core body is further provided with a third groove sinking relative to the second groove.
  • the metal sheet is provided with a metal sheet ventilation slot, and the metal sheet ventilation slot communicates with the valve core ventilation slot correspondingly.
  • the present invention provides an explosion-proof valve.
  • This explosion-proof valve is equipped with an explosion-proof valve core that quickly discharges high-temperature and high-pressure gas.
  • the valve body is also provided with a number of air vents, which speeds up the inflation or extraction speed, and can quickly adjust the temperature and pressure in the box being installed.
  • the inner sealing ring of the valve is fixed by providing an inner sealing ring groove, which solves the problem of poor sealing caused by the inner sealing ring falling off and being displaced.
  • an explosion-proof valve which includes a valve body, an explosion-proof valve spring, an outer seal ring, a guide rod, and an explosion-proof valve core.
  • the surface of the valve body is provided with an explosion-proof valve core.
  • a mounting groove in which the explosion-proof valve core is sealed and arranged in the mounting groove; a side of the valve body is provided with a clamping groove; a center of the valve body is provided with a guide hole for the core, and the inner wall of the valve body is connected to the core with the guide hole through a plurality of connecting ribs As a whole, a ventilation hole is formed between each adjacent two connecting ribs; a first ventilation hole penetrating the extending direction of the guide rod is provided in the guide rod, a guide rod connection portion is provided on the bottom surface of the valve core body, and the guide rod The connecting portion is provided with a valve core ventilation hole communicating with the third groove, and the guide rod passes through the explosion-proof valve spring, the valve core guide hole and the guide rod connection portion on the bottom surface of the valve body in order, and is connected with the valve core guide hole. Sliding fit; the bottom surface of the valve body is provided with an outer seal ring groove, and the outer seal ring is provided in the outer seal ring groove.
  • the inner seal ring groove is provided at the bottom of the explosion-proof valve core installation groove, and the inner seal ring is provided in the inner seal groove.
  • the inner seal ring groove is a dovetail groove with an upper narrow and a lower wide.
  • valve body is provided with a mounting hole at one end remote from the explosion-proof valve core.
  • an installation thread is provided on an end of the valve body remote from the explosion-proof valve.
  • the present invention provides a box airtightness detection jig.
  • the airtightness detection fixture of the box body is used for detecting the airtightness of the valve body by the claws being clamped in the grooves on the valve body.
  • the detection speed is fast, the efficiency is high, and the operation is convenient and quick.
  • a box air-tightness detection jig which includes a jig body, a magnet base, a jig sealing ring, a guide post, and a jig spring.
  • the jig body has a hollow structure inside, and One end is closed at the other end, and a claw for engaging in the card slot is provided at one end of the opening, and a first step is provided at the closed end.
  • the first step is provided with a fourth groove, and the center of the fourth groove is provided.
  • the magnet seat is arranged in the body of the clamp.
  • the bottom surface of the magnet seat is provided with a second ventilation hole penetrating the extension direction of the magnet seat and a magnet for adsorbing the metal sheet in the explosion-proof valve core. Connected clamp seals;
  • a guide post boss is provided on the side wall of the guide post, and the bottom surface of the guide post boss is clamped on the end face of the fourth groove, and the guide post boss is inserted into the fourth groove by rotating the guide post;
  • a third vent hole is provided inside the guide post, and a vent groove communicating with the third vent hole is provided on a surface of one end of the guide post, and one end of the guide post passes through the guide post guide hole, the clamp spring, and is connected with the magnet seat in order.
  • the third ventilation hole of the guide post is in communication with the second ventilation hole.
  • a handle is further included, and the handle is connected to the guide post through a thread, or both are integrated.
  • the magnet is a cylindrical or circular strong permanent magnet.
  • the valve core of the present invention is provided with a waterproof breathable membrane, a breathable membrane fixing part and a metal sheet, wherein the diaphragm fixing part and the valve core body are interference-fitted and tightly pressed on the outside of the waterproof breathable membrane, so that the waterproof breathable membrane is closely attached.
  • the sealing is stable and reliable; the metal piece in the valve core provides a simple and reliable method for opening the valve core when the box is inspected.
  • the valve body of the present invention is provided with an inner sealing ring groove for setting and installing the inner sealing ring.
  • the inner sealing ring groove can effectively fix the inner seal and prevent the inner sealing ring from moving or falling out when the valve core is opened, causing the valve core to return to seal. bad.
  • Figure 1 is an exploded view of the valve core assembly.
  • Fig. 2 is a perspective view of a valve body.
  • Fig. 3 is a schematic sectional view of a valve body.
  • Figure 4 is an exploded view of the explosion-proof valve assembly.
  • Fig. 5 is a schematic sectional view of a valve body.
  • Fig. 6 is a schematic sectional view of a valve body according to another embodiment.
  • FIG. 7 is an assembly structural diagram of a box airtightness detection jig.
  • FIG. 8 is an exploded view of the box airtightness detection jig assembly.
  • Fig. 9 is a schematic perspective view of a guide post.
  • FIG. 10 is a schematic perspective view of a magnet holder.
  • Valve core body 101. Guide rod connecting portion; 102. Valve core vent hole; 103. Valve core vent groove; 104. Third groove; 105. Second groove; 106. First Groove; 107. End face of valve core body; 2. Waterproof and breathable diaphragm; 3. Diaphragm fixing piece; 4. Metal piece; 401. Metal piece breathable slot; 5. Protective cover; 6. Guide rod; 601. A vent hole; 602. guide rod boss; 7. valve body; 701 valve core guide hole; 702. vent; 703. card slot; 704. inner seal groove; 705. connecting ribs; 706. outer seal Groove; 707 mounting hole; 708. mounting thread; 709. valve body edge boss; 710. mounting groove; 8.
  • the present invention relates to an explosion-proof valve core, which includes a valve core body 1, a waterproof and breathable diaphragm 2, a diaphragm fixing member 3, a metal piece 4, and a protective cover 5.
  • the end face of the valve core body 107 is provided with a valve core ventilation groove 103, a first groove 106, and a second groove 105 sinking relative to the first groove 106; one end of the valve core ventilation groove 103 communicates with the first groove 106, and the other end extends to The outside of the valve body 1; the waterproof and breathable membrane 2 is disposed in the second groove 105, and the diaphragm fixing member 3 is disposed in the second groove 105 and pressed on the edge of the surface of the waterproof and breathable membrane 2 The metal sheet 4 is disposed in the first groove 106.
  • the protective cover 5 is adhered to the end surface 107 of the valve body, or is mounted on the valve body 1 in an interference fit.
  • the valve core of the present invention is provided with a waterproof and breathable diaphragm 2, a diaphragm fixing 3 pieces and a metal piece 4, wherein the diaphragm fixing piece 3 and the valve core body 1 are in an interference fit and tightly pressed against the waterproof and breathable diaphragm 2.
  • the waterproof and breathable membrane 2 is closely attached to the valve core body 1, and the sealing and fixing is stable and reliable.
  • the metal piece 4 in the valve core is a round metal piece that can be adsorbed by magnetic materials.
  • a plurality of vent slots are provided on the top, corresponding to the vent slots 103 of the valve core during assembly.
  • the metal sheet 4 provides a simple and reliable method for opening the valve core when the box is inspected.
  • valve core body end surface 107 is further provided with a third groove 104 that sinks relative to the second groove 105.
  • the purpose of setting the third groove 104 is to prevent the large area of the waterproof and breathable membrane 2 from abutting on the valve core body 1 and causing the ventilation to be blocked, thereby increasing the effective breathable area of the membrane.
  • the metal sheet 4 is provided with a metal sheet ventilation slot 401, and the metal sheet ventilation slot 401 communicates with the valve core ventilation slot 103 correspondingly.
  • the design of the metal sheet ventilation slot 401 is beneficial to the rapid dispersion and discharge of the gas.
  • An explosion-proof valve includes a valve body 7, an explosion-proof valve spring 10, an inner seal ring 8, a guide rod 6, and an explosion-proof valve core.
  • the surface of the valve body 7 is provided with an explosion-proof valve core.
  • the explosion-proof valve core is sealed in the mounting groove 710.
  • the bottom of the mounting groove 710 is provided with an inner seal groove 704.
  • the inner seal 8 is provided in the inner seal groove 704.
  • the valve body 7 A slot 703 is provided on the side; a valve core guide hole 701 is provided in the center of the valve body 7, and the inner wall of the valve body 7 is connected to the valve core guide hole 701 through a plurality of connecting ribs 705.
  • a ventilation hole 702 is formed between the guide rods 6; a first ventilation hole 601 is provided in the guide rod 6 to penetrate the extending direction of the guide rod; a guide rod connecting portion 101 is provided on the bottom surface of the valve body 1; The valve core vent hole 102 communicating with the third groove 104, the guide rod 6 passes through the explosion-proof valve spring 10, the valve core guide hole 102 and the guide rod connecting portion 101 on the bottom surface of the valve body 1 in order, and is connected to the valve core The guide hole 102 is slidably fitted.
  • the valve body 7 of the present invention is provided with an inner seal groove 704 for installing and installing the inner seal ring 8.
  • the inner seal groove 704 can effectively fix the inner seal and prevent the inner seal ring 8 from moving when the valve core is opened. Or the valve core is reset badly due to being pulled out;
  • the guide rod 6 is provided with a guide rod boss 602, and one end of the explosion-proof valve spring 10 is pressed against the guide rod boss 602, which can prevent the explosion-proof valve spring 10 from sliding down.
  • the opening pressure of the explosion-proof valve spool is controlled by the spring force, among which the opening pressure is 5 ⁇ 50kPa.
  • the explosion-proof pressure is 7 ⁇ 20kPa.
  • valve body 7 further includes an outer seal ring 9.
  • the bottom surface of the valve body 7 is provided with an outer seal ring groove 706, and the outer seal ring 9 is provided in the outer seal ring groove 706.
  • the design of the outer seal ring 9 and the outer seal groove 706 is conducive to enhancing the sealing performance of the valve body 7.
  • a mounting hole 707 is provided on one end of the valve body 7 away from the explosion-proof valve core.
  • the explosion-proof valve body is provided with four mounting holes 707.
  • Four small screw rods are selected to pass through the through holes on the box body, and are threadedly connected to the explosion-proof valve mounting hole 707, and then the explosion-proof valve is fixedly installed on the box body.
  • an end of the valve body 7 far from the explosion-proof valve core is provided with a mounting thread 708.
  • the mounting thread 708 is installed in the corresponding screw hole on the box body, and the valve body 7 can be fixedly connected to the box body; it can also pass through the through hole on the box body, and at the same time, a nut is used to install on the mounting thread 708.
  • the valve body 7 is fixedly connected to the box body; these two methods are easy to operate and the connection is stable.
  • a box airtightness testing jig which includes a jig body 11, a magnet holder 13, a jig sealing ring 15, a guide post 16, and a jig spring 12.
  • the inside of the jig body 11 is a hollow structure. And one end is closed at the other end, a claw 111 for locking in the slot 703 is provided at one end of the opening, a first step 112 is provided at the closed end, and a fourth groove 113 is provided in the first step 112 The center of the fourth groove 113 is provided with a guide post guide hole 114 communicating with the clamp body 11;
  • the magnet 13 is seated in the clamp body 11.
  • the bottom surface of the magnet seat 13 is provided with a second ventilation hole 133 penetrating the extension direction of the magnet seat and a magnet 14 for adsorbing the metal piece 4 in the explosion-proof valve core.
  • a clamp sealing ring 15 which is sealingly connected to the edge of the valve body end surface 107;
  • a guide post boss 161 is provided on a side wall of the guide post 16, and a bottom surface of the guide post boss 161 is clamped on an end face of the fourth groove 113.
  • the guide post boss 161 is inserted into the fourth guide post by rotating the guide post 16.
  • a third vent hole 164 is provided inside the guide post 16, and a vent groove 162 communicating with the third vent hole 164 is provided on a surface of one end of the guide post 16, and one end of the guide post 16 passes through in sequence
  • the guide post guide hole 114, the clamp spring 12 are connected to the magnet base 13, and the third ventilation hole 164 of the guide post 16 is in communication with the second ventilation hole 133.
  • the magnet 14 on the airtight detection fixture is used to suck up the valve core and open the valve core, and inflate from the vent groove 162 and the third vent hole 164 and from the vent membrane of the explosion-proof valve.
  • the use time is short, the detection efficiency is high, and it will not cause damage to the ventilation membrane, and the explosion-proof valve will fail.
  • a guide post connecting portion 132 corresponding to the guide post 16 is provided on the surface of the guide post.
  • the guide post 16 is connected to the magnet base 13 through the guide post connecting portion 132.
  • the clamp body 11 may be preferably designed as a hollow semi-cylindrical shape.
  • the bottom surface of the magnet holder 13 may be provided with a seventh groove 136, a sixth groove 135, and a fifth groove 134 which sequentially diffuse outward, wherein the magnet 14 is placed in the seventh groove 136, and the clamp sealing ring 15 is placed.
  • An eighth groove 137 sinking in the fifth groove 134 and a seventh groove 136 is provided in the seventh groove 136, and a second ventilation hole 133 penetrating the upper and lower grooves is provided in the eighth groove 136, and
  • the eighth groove 137 communicates with the sixth groove 135;
  • the sixth groove 135 communicates with the second ventilation hole 133 through the eighth groove 137 and forms a first ventilation passage;
  • a second step 131 is formed between 132 to facilitate connection and fixation with the guide post 16.
  • the guide post 16 is provided with a plane 163 and a threaded hole 162 on the surface, and communicates with the third ventilation hole 164 to form a second ventilation passage;
  • the threaded hole 162 is provided with an air pipe joint 18 and the guide post 16
  • One end passes through the guide post guide hole 114, the clamp spring 12 and is connected to the magnet base 13 in this order, and the first ventilation channel is in communication with the second ventilation channel
  • a handle 17 is further included, and the handle 17 is connected to the guide post 16 or both are integrated.
  • the handle 17 and the guide post 16 may be connected by threads for easy processing and installation; the handle 17 and the guide post 16 may also be integrally processed, which is convenient and quick to operate.
  • the magnet 14 is a cylindrical or circular strong permanent magnet.
  • the magnet 14 is preferably a strong permanent magnet, so it does not need to be connected to a power source to generate magnetism.
  • the box body is inflated or evacuated, and the pressure is maintained for a period of time to detect the leak to verify the tightness of the box; After the test, the handle 17 is used to lift the magnet seat 13 upward.
  • the explosion-proof valve spring 10 is continuously compressed. The spring force gradually increases.
  • the suction force of the magnet 14 and the explosion-proof valve core is smaller than the spring force of the explosion-proof valve spring 10, the magnet 14 is detached from the explosion-proof valve core.
  • the explosion-proof valve core is reset and kept sealed by the explosion-proof valve spring 10.
  • Handle 17 makes guide post boss 161 exceed A step 112, a certain rotation angle, for example 90 degrees, the magnet holder 13 can be positioned at a high level.

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Abstract

一种防爆阀芯、含有该阀芯的防爆阀及箱体气密检测夹具，防爆阀芯包括阀芯本体（1）、防水透气膜片（2）、膜片固定件（3）、金属片（4）及防护盖（5）；防爆阀包括该防爆阀芯、阀本体（7）、防爆阀弹簧（10）、内密封圈（8），防爆阀芯设于阀本体（7）上；适用于该防爆阀的箱体气密检测夹具包括夹具本体（11）、磁铁座（13）、夹具密封圈（15）、导柱（16）、夹具弹簧（12），箱体气密检测时自动打开防爆阀芯，通过防爆阀的快速泄压通道往箱体内充气。

Description

一种防爆阀芯、含有该阀芯的防爆阀及箱体气密检测夹具 技术领域
本发明涉及密封箱体防爆阀及密封性检测技术领域，尤指一种防爆阀芯、含有该阀芯的防爆阀及箱体气密检测夹具。
 背景技术
密封的箱体，例如户外电气控制箱，储能电池箱、电动车电池包等是相关设备或新能源汽车的“心脏”，作为控制及驱动的核心部件，其安全性及工作稳定、可靠性直接响到设备或新能源电动车的使用性能及安全性。当控制器箱体内进水后绝缘性能降低引起短路、控制系统失灵；如电池包进水会导致电池短路，进而引起电池爆炸，为了预防电池包内电池组或电气控制箱内元器件的性能受到水、灰尘等影响，对于户外电器控制箱、电池包等箱体要求必须进行密封，其防水及防尘防护等级要求达到国家标准GB 4208-2008《外壳防护等级》（IP代码）IP67以上。但是在完全密封的情况下，工作时电气元件会产生热量，导致箱体内的空气因温度上升而膨胀，如果不能及时排出将造成箱体内压力不断增加，进而箱体变形、橡胶密封件失效，导致箱体防水防尘等级降低，电子电气元件受损等异常，另外对于安装有电池、大型电容器等元件的密封箱体，其中的电池、电容出现失控时会产生高温高压，会在箱体内产生巨大的压力，存在剧烈爆炸的风险，因此需要一种防爆阀来预防爆破或减少爆炸产生的损伤。
对于密封箱体防护等级的检测，在GB 4208-2008标准明确规定了IP67及以上防护等级的测试方法及要求：防尘测试采用滑石粉在防尘试验箱试验，要求试验结束箱体内不能有灰尘沉积；防水测试要求浸水1米水深，测试时间至少30分钟。按以上标准方法检测，操作复杂，用时较多，检测后箱体粘附有水及粉尘，需要清洁、干燥，检测后处理麻烦，只适于抽样检验，达不到密封箱体批量生产制程中快速检测的要求，为此行业内在批量生产制程中均采用充气或者抽气检测箱体是否漏气来验证箱体是否密封良好来验证箱体防护效果。
 技术问题
一般采用以下方法：（1）在箱体上钻一个螺纹孔，接充气接头进行检测，此方法虽然充气检测速度快，但是需在箱体上多开一个孔，增加了箱体加工难度，并且在充气检测后合格后再安装一个螺栓进行二次封堵密封，无法证明螺栓二次密封效果，存在充气孔二次密封不良，达不到防护等级的风险。（2）通过防爆阀的透气膜往箱体内充气，但是防水透气膜透气量一般较小，充气或抽气速度非常慢，检测效率低的问题，并且从透气阀充气检测存在会使防水透气膜破损，导致防爆阀失效的风险。
因此现有技术的防爆阀及箱体密封性检测需进一步研究、改进。
 技术解决方案
为解决上述问题之一，本发明提供一种防爆阀芯。本防爆阀芯上设置有防水透气膜、气流通道及可实现快速打开防爆阀芯的金属片，正常工作状态下防水透气膜要阻水进入，但可双向透气实现箱体内外压力平衡；在充气检测箱体密封性时，以及当箱体内压力过大时防爆阀芯可开启，快速充气或排出高温高压气体，大大降低了防水透气膜片破损的可能性，还能预防爆破或减少爆炸产生的损伤。
为实现上述目的，本发明采用的技术方案是：一种防爆阀芯，包括阀芯本体、防水透气膜片、膜片固定件、金属片，所述阀芯本体端面设有阀芯透气槽、第一凹槽、相对第一凹槽下沉的第二凹槽；所述阀芯透气槽一端与第一凹槽连通，另一端延伸到阀芯本体外侧；所述防水透气膜片设于第二凹槽内，所述膜片固定件设置在第二凹槽内且压合在防水透气膜片表面的边缘处；所述金属片设于第一凹槽内。
具体的，所述阀芯本体端面还设有相对于第二凹槽下沉的第三凹槽。
具体的，所述金属片上设有金属片透气槽孔，所述金属片透气槽孔与阀芯透气槽对应连通。
为解决上述问题之二，本发明提供一种防爆阀。本防爆阀内安装有快速排出高温高压气体的防爆阀芯，并且阀本体内还设有若干个透气口，加快了充气或抽气的速度，可快速调节被安装箱体内的温度和气压；防爆阀的内密封圈通过设置内密封圈槽将其固定，解决了内密封圈因为脱落、移位而造成密封不良的问题。
为实现上述目的，本发明采用的技术方案是：一种防爆阀，包括阀本体、防爆阀弹簧、外密封圈、导杆及防爆阀芯，所述阀本体表面设有用于安装防爆阀芯的安装槽，防爆阀芯密封设置在安装槽内的；所述阀本体侧面设有卡槽；所述阀本体中心设有阀芯导向孔，阀本体内壁通过多条连接筋与阀芯导向孔连为一体，每相邻两条连接筋之间形成透气口；所述导杆内设有贯通导杆延伸方向的第一透气孔，所述阀芯本体底面设有导杆连接部，且导杆连接部内设有与第三凹槽连通的阀芯透气孔，所述导杆依次穿过防爆阀弹簧、阀芯导向孔与阀芯本体底面的导杆连接部连接，并与阀芯导向孔滑动配合；所述阀本体底面设有外密封圈槽，外密封圈设于外密封圈槽内。
具体的，还包括内密封圈槽及内密封圈，所述所述内密封圈槽设于防爆阀芯安装槽的底部，所述内密封圈设于内密封圈槽内
具体的，所述所述内密封圈槽为上窄下宽的燕尾槽。
具体的，所述阀本体远离防爆阀芯一端设有安装孔。
具体的，所述阀本体远离防爆阀一端延伸设有安装螺纹。
为解决上述问题之三，本发明提供一种箱体气密性检测夹具。本箱体气密性检测夹具通过卡爪卡接在阀本体上的卡槽内来对阀本体进行气密性检测，检测速度快，效率高，操作方便快捷。
为实现上述目的，本发明采用的技术方案是：一种箱体气密性检测夹具，包括夹具本体、磁铁座、夹具密封圈、导柱、夹具弹簧，所述夹具本体内部为中空结构，且一端封闭另一端开口，在开口一端设有用于卡设在卡槽内的卡爪，在封闭端设有第一台阶，所述第一台阶内设有第四凹槽，第四凹槽中心设有与夹具本体连通的导柱导向孔；
所述磁铁座设于夹具本体内，所述磁铁座底面设有贯通磁铁座延伸方向的第二透气孔和用于吸附防爆阀芯中金属片的磁铁，并且还设有与阀本体端面边缘密封连接的夹具密封圈；
所述导柱侧壁设有导柱凸台，所述导柱凸台的底面卡设在第四凹槽端面，通过旋转导柱使得导柱凸台插接在第四凹槽内；所述导柱内部设有第三透气孔，在导柱一端的表面设有与第三透气孔连通的透气槽，所述导柱的一端依次穿过导柱导向孔、夹具弹簧并与磁铁座连接，且导柱的第三透气孔与第二透气孔连通。
具体的，还包括手柄，所述手柄与导柱通过螺纹连接，或者二者为一体。
具体的，所述磁铁为圆柱或者圆环形强力永磁铁。
 有益效果
本发明的有益效果在于：
1.本发明阀芯内设有防水透气膜、透气膜固定件及金属片，其中膜片固定件与阀芯本体过盈配合紧密压合在防水透气膜片外侧，使防水透气膜片紧密贴合阀芯本体上，密封固定性稳定可靠；阀芯内的金属片，为箱体检测时打开阀芯提供了一种简单、可靠的方法。
2.本发明阀本体上设有内密封圈槽，用于设置安装内密封圈，内密封圈槽可以有效的固定内密封，防止阀芯开启时，内密封圈移动或脱出造成阀芯复位密封不良。
3.当检测箱体气密性时，使用气密检测夹具上的磁铁吸起阀芯并打开阀芯，从泄压通道充气与从防爆阀的透气膜处充气相比进气速度快、用时短，检测效率高，并且不会导致透气膜损坏，防爆阀失效。爆破泄压后，当箱体内的压力小于阀芯开启压力时阀芯可自动复位保持密封状态，故在制程中可通过100%检测防爆阀的防爆性能，保证防爆阀的质量。本发明检测夹具安装及拆下操作简单、快捷，3S钟可完成安装操作。
 附图说明
图1是阀芯组装爆炸图。
图2是阀芯本体立体图。
图3是阀芯本体剖面示意图。
图4是防爆阀组装爆炸图。
图5是阀本体剖面示意图。
图6是另一实施例阀本体剖面示意图。
图7是箱体气密性检测夹具组装结构图。
图8是箱体气密性检测夹具组装爆炸图。
图9是导柱立体示意图。
图10是磁铁座立体示意图。
附图标号说明：1. 阀芯本体；101.导杆连接部；102.阀芯透气孔；103.阀芯透气槽；104.第三凹槽；105.第二凹槽；106.第一凹槽；107.阀芯本体端面；2.防水透气膜片；3.膜片固定件；4.金属片；401.金属片透气槽孔；5.防护盖；6.导杆；601.第一透气孔；602.导杆凸台；7.阀本体；701.阀芯导向孔；702.透气口；703.卡槽；704.内密封圈槽；705.连接筋；706.外密封圈槽；707安装孔；708.安装螺纹；709.阀本体边缘凸台；710.安装槽；8.内密封圈；9.外密封圈；10.防爆阀弹簧；11.夹具本体；111.卡爪；112. 第一台阶；113.第四凹槽；114.导柱导向孔；12.夹具弹簧；13.磁铁座；131. 第二台阶；132.导柱连接部；133.第二透气孔；134.第五凹槽；135.第六凹槽；136.第七凹槽；137.第八凹槽；14.磁铁；15. 夹具密封圈；16.导柱；161. 导柱凸台；162.螺纹孔；163.平面；164.第三透气孔；17.手柄；18.气管接头。
 本发明的最佳实施方式
请参阅图1-3所示，本发明关于一种防爆阀芯，包括阀芯本体1、防水透气膜片2、膜片固定件3、金属片4及防护盖5，所述阀芯本体端面107设有阀芯透气槽103、第一凹槽106、相对第一凹槽106下沉的第二凹槽105；所述阀芯透气槽103一端与第一凹槽106连通，另一端延伸到阀芯本体1外侧；所述防水透气膜片2设于第二凹槽105内，所述膜片固定件3设置在第二凹槽105内且压合在防水透气膜片2表面的边缘处；所述金属片4设于第一凹槽106内。所述防护盖5粘合在阀芯本体端面107上，或者过盈配合安装在阀芯本体1上。
作为优选例，本发明阀芯内设有防水透气膜片2、膜片固定3件及金属片4，其中膜片固定件3与阀芯本体1过盈配合紧密压合在防水透气膜片2表面的边缘处，使防水透气膜片2紧密贴合阀芯本体1上，密封固定性稳定可靠；阀芯内的金属片4为可被磁性材料吸附的圆形金属片，可以在金属片4上设置多个透气槽孔，装配时与阀芯透气槽103相对应，金属片4为箱体检测时打开阀芯提供了一种简单、可靠的方法。
具体的，所述阀芯本体端面107还设有相对于第二凹槽105下沉的第三凹槽104。
上述方案中，第三凹槽104的设置目的是为了防止防水透气膜片2大面积紧贴在阀芯本体1上导致透气受阻，增大膜片的有效透气面积。
具体的，所述金属片4上设有金属片透气槽孔401，所述金属片透气槽孔401与阀芯透气槽103对应连通。
上述方案中，金属片透气槽孔401的设计有利于气体的快速分散排出。
请参阅图4-6所示，一种防爆阀，包括阀本体7、防爆阀弹簧10、内密封圈8、导杆6及防爆阀芯，所述阀本体7表面设有用于安装防爆阀芯的安装槽710，防爆阀芯密封设置在安装槽710内的，安装槽710的底部设有内密封圈槽704，所述内密封圈8设于内密封圈槽704内，所述阀本体7侧面设有卡槽703；所述阀本体7中心设有阀芯导向孔701，阀本体7内壁通过多条连接筋705与阀芯导向孔701连为一体，每相邻两条连接筋705之间形成透气口702；所述导杆6内设有贯通导杆延伸方向的第一透气孔601，所述阀芯本体1底面设有导杆连接部101，且导杆连接部101内设有与第三凹槽104连通的阀芯透气孔102，所述导杆6依次穿过防爆阀弹簧10、阀芯导向孔102与阀芯本体1底面的导杆连接部101连接，并与阀芯导向孔102滑动配合。
作为优选例，本发明阀本体7上设有内密封圈槽704，用于设置安装内密封圈8，内密封圈槽704可以有效的固定内密封，防止阀芯开启时，内密封圈8移动或脱出造成阀芯复位密封不良；导杆6上设置有导杆凸台602，防爆阀弹簧10一端压在导杆凸台602上，可以很好地发防止防爆阀弹簧10滑落。
防爆阀阀芯开启压力由弹簧力控制，其中开启压力为5～50kPa，作为进一步优化阀芯开启压力，即防爆压力为7～20kPa。当箱体内的压力达到防爆压力时，阀芯会被顶起，阀芯与内密封圈9之间存在一定的间隙，气体可快速从透气口702与间隙排出泄压，有非常好的防爆稳定性，在排气泄压至箱体内压力小于阀芯开启压力时，阀芯在防爆阀弹簧10的作用下快速复位，阀芯压紧内密封圈8实现正常状态下的密封。
具体的，还包括外密封圈9，所述阀本体7底面设有外密封圈槽706，外密封圈9设于外密封圈槽706内。
上述方案中，外密封圈9、外密封圈槽706的设计有利于增强阀本体7的密封性。
具体的，所述阀本体7远离防爆阀芯一端设有安装孔707。
上述方案中，防爆阀本体上设四个安装孔707，选用四个小螺丝杆穿过箱体上通孔，与防爆阀安装孔707螺纹连接，进而使用防爆阀固定安装在箱体上。
具体的，另一实施方案所述阀本体7远离防爆阀芯一端延伸设有安装螺纹708。
上述方案中，安装螺纹708安装到箱体上的对应螺孔中，可将阀本体7与箱体固定连接；也可穿过箱体上的通孔，同时选用一个螺母安装在安装螺纹708上，将阀本体7与箱体固定连接；此两种方法操作方便，连接稳固。
请参阅图7-10所示，一种箱体气密性检测夹具，包括夹具本体11、磁铁座13、夹具密封圈15、导柱16、夹具弹簧12，所述夹具本体11内部为中空结构，且一端封闭另一端开口，在开口一端设有用于卡设在卡槽703内的卡爪111，在封闭端设有第一台阶112，所述第一台阶112内设有第四凹槽113，第四凹槽113中心设有与夹具本体11连通的导柱导向孔114；
所述磁铁13座设于夹具本体11内，所述磁铁座13底面设有贯通磁铁座延伸方向的第二透气孔133和用于吸附防爆阀芯中金属片4的磁铁14，并且还设有与阀本体端面107边缘密封连接的夹具密封圈15；
所述导柱16侧壁设有导柱凸台161，所述导柱凸台161的底面卡设在第四凹槽113端面，通过旋转导柱16使得导柱凸台161插接在第四凹槽113内；所述导柱16内部设有第三透气孔164，在导柱16一端的表面设有与第三透气孔164连通的透气槽162，所述导柱16的一端依次穿过导柱导向孔114、夹具弹簧12并与磁铁座13连接，且导柱16的第三透气孔164与第二透气孔133连通。
作为优选例，箱体气密性检测时，使用气密检测夹具上的磁铁14吸起阀芯并打开阀芯，从透气槽162、第三透气孔164充气与从防爆阀的透气膜处充气相比进气速度快、用时短，检测效率高，并且不会导致透气膜损坏，防爆阀失效。爆破泄压后，当箱体内的压力小于阀芯开启压力时阀芯可自动复位保持密封状态，故在制程中可通过100%检测防爆阀的防爆性能，保证防爆阀的质量；在磁铁座13的表面上设有对应导柱16的导柱连接部132，导柱16通过导柱连接部132与磁铁座13连接，夹具本体11可优选设计为空心半圆柱形。
 本发明的实施方式
上述方案中，磁铁座13底面可以设有依次往外扩散的第七凹槽136、第六凹槽135、第五凹槽134，其中磁铁14放置在第七凹槽136内，夹具密封圈15放置在第五凹槽134内，并且第七凹槽136内设有相对第七凹槽136下沉的第八凹槽137，第八凹槽136内设有贯通上下的第二透气孔133，且第八凹槽137与第六凹槽135连通；所第六凹槽135通过第八凹槽137与第二透气孔133相连通，并形成第一透气通道；磁铁座13表面与导柱连接部132之间形成第二台阶131，有利于和导柱16连接固定。
上述方案中，导柱16上设有一个平面163，并在表面设有一螺纹孔162，并与第三透气孔164连通构成第二透气通道；螺纹孔162内设置有气管接头18，导柱16的一端依次穿过导柱导向孔114、夹具弹簧12并与磁铁座13连接，第一透气通道与第二透气通道连通
具体的，还包括手柄17，所述手柄17与导柱16连接，或者二者为一体。
上述方案中，手柄17与导柱16可通过螺纹连接，便于加工、安装；也可以将手柄17与导柱16二者一体加工而成，操作方便快捷。
具体的，所述磁铁14为圆柱或者圆环形强力永磁铁。
上述方案中，磁铁14优选为强力永磁铁，则不需接电源产生磁性。
 工业实用性
箱体气密性检测夹具工作原理：
检测箱体气密性时，首先将卡爪111套入防爆阀阀本体7上的卡槽703中，使磁铁座13上的夹具密封圈15密封紧贴在阀本体边缘凸台上709，并使导柱凸台161的底面卡设在第四凹槽113端面，通过旋转导柱16使得导柱凸台161插接在第四凹槽113内，同时磁铁座13下降至低位，磁铁14与阀芯内的金属片4相吸，阀芯被吸起打开，气体可通过第一透气通道、第二透气通道、防爆阀芯与内密封圈8之间间隙及透气口702进出，进而实现向箱体内充气或者抽真空，并保压一段时间检测是否漏气来检测验证箱体的密性；检测后手持手柄17向上提起磁铁座13，随着阀芯的上升，防爆阀弹簧10不断被压缩，弹力逐渐增大，当磁铁14与防爆阀芯的吸力小于防爆阀弹簧10弹力时，磁铁14与防爆阀芯脱离，防爆阀芯在防爆阀弹簧10作用下复位并保持密封状态，继续向上拉手柄17使导柱凸台161超过第一台阶112，旋转一定的角度，例如90度角，即可将磁铁座13定位在高位。
以上实施方式仅仅是对本发明的优选实施方式进行描述，并非对本发明的范围进行限定，在不脱离本发明设计精神的前提下，本领域普通工程技术人员对本发明的技术方案作出的各种变形和改进，均应落入本发明的权利要求书确定的保护范围内。

Claims (10)

  1. 一种防爆阀芯，其特征在于：包括阀芯本体、防水透气膜片、膜片固定件、金属片，所述阀芯本体端面设有阀芯透气槽、第一凹槽、相对第一凹槽下沉的第二凹槽；所述阀芯透气槽一端与第一凹槽连通，另一端延伸到阀芯本体外侧；所述防水透气膜片设于第二凹槽内，所述膜片固定件设置在第二凹槽内且压合在防水透气膜片表面的边缘处；所述金属片设于第一凹槽内。
  2. 根据权利要求1所述的防爆阀芯，其特征在于：所述阀芯本体端面还设有相对于第二凹槽下沉的第三凹槽。
  3. 根据权利要求1所述的防爆阀芯，其特征在于：所述金属片上设有金属片透气槽孔，所述金属片透气槽孔与阀芯透气槽对应连通。
  4. 一种防爆阀，其特征在于：包括阀本体、防爆阀弹簧、外密封圈、导杆及权利要求1-3任一项所述的防爆阀芯，所述阀本体表面设有用于安装防爆阀芯的安装槽，防爆阀芯密封设置在安装槽内；所述阀本体侧面设有卡槽；所述阀本体中心设有阀芯导向孔，阀本体内壁通过多条连接筋与阀芯导向孔连为一体，相邻连接筋之间形成透气口；所述导杆内设有贯通导杆延伸方向的第一透气孔，所述阀芯本体底面设有导杆连接部，且导杆连接部内设有与第三凹槽连通的阀芯透气孔，所述导杆依次穿过防爆阀弹簧、阀芯导向孔与阀芯本体底面的导杆连接部连接，并与阀芯导向孔滑动配合；所述阀本体底面设有外密封圈槽，外密封圈设于外密封圈槽内。
  5. 根据权利要求4所述的防爆阀，其特征在于：还包括内密封圈槽及内密封圈。所述所述内密封圈槽为上窄下宽的燕尾槽，设于防爆阀芯安装槽的底部，所述内密封圈设于内密封圈槽内。
  6. 根据权利要求4所述的防爆阀，其特征在于：所述阀本体远离防爆阀芯一端设有安装孔。
  7. 根据权利要求4所述的防爆阀，其特征在于：所述阀本体远离防爆阀一端延伸设有安装螺纹。
  8. 一种适用于权利要求4-7任一项防爆阀的箱体气密性检测夹具，其特征在于：包括夹具本体、磁铁座、夹具密封圈、导柱、夹具弹簧，所述夹具本体内部为中空结构，且一端封闭另一端开口，在开口一端设有用于卡设在卡槽内的卡爪，在封闭端设有第一台阶，所述第一台阶内设有第四凹槽，第四凹槽中心设有与夹具本体连通的导柱导向孔；
    所述磁铁座设于夹具本体内，所述磁铁座底面设有贯通磁铁座延伸方向的第二透气孔和用于吸附防爆阀芯中金属片的磁铁，并且还设有与阀本体的端面边缘密封连接的夹具密封圈；
    所述导柱侧壁设有导柱凸台，所述导柱凸台的底面卡设在第四凹槽端面，通过旋转导柱使得导柱凸台插接在第四凹槽内；所述导柱内部设有第三透气孔，在导柱一端的表面设有与第三透气孔连通的透气槽，所述导柱的一端依次穿过导柱导向孔、夹具弹簧并与磁铁座连接，且导柱的第三透气孔与第二透气孔连通。
  9. 根据权利要求8所述的箱体气密性检测夹具，其特征在于：还包括手柄，所述手柄与导柱连接，或者二者为一体。
  10. 根据权利要求8所述的箱体气密性检测夹具，其特征在于：所述磁铁为圆柱或者圆环形强力永磁铁。
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