CN218582361U - Balanced explosion-proof valve - Google Patents

Abstract

The utility model provides a balanced explosion-proof valve, includes the valve body, assemble in the pressure release subassembly of valve body upside and assemble in the atmospheric pressure balance subassembly of pressure release subassembly downside, the valve body includes the valve outer lane body, the valve inner lane body and connects the internal face of valve outer lane body with a plurality of linking arms of valve inner lane external surface, pressure release subassembly include the crimping in piston, periphery on the valve outer lane body surface combine in waterproof ventilated membrane on the piston and cover in upper cover plate on the piston, the piston includes inner cavity, certainly the upwards protruding crimping step that forms of inner cavity periphery reaches certainly the outer loop portion that forms of crimping step outer fringe is upwards protruding, the periphery of waterproof ventilated membrane is fixed in on the crimping step and cover the inner cavity, the bottom surface crimping of outer loop portion in on the first sealing washer on the valve outer lane body surface, the upper cover plate correspond to the intercommunication has been seted up in outer loop portion the air channel of waterproof ventilated membrane and external world. The manufacturing cost is low.

Description

Balanced explosion-proof valve

Technical Field

The application relates to the technical field of explosion prevention of power batteries, in particular to a balance explosion-proof valve.

Background

The balance explosion-proof valve is used for keeping balance of internal and external pressures of the power battery, relieving the pressure of the battery in advance and avoiding safety accidents caused by explosion of the power battery. The patent application No. 202121092721.1 of the people's republic of China discloses a balanced explosion-proof valve, the balanced explosion-proof valve includes the valve body, wear to locate the guide arm in the valve body, locate the spring between valve body and the guide arm, be fixed in the piston of guide arm tip, be equipped with the bleeder vent that corresponds with the ventilative centre bore of guide arm on the piston, install on the piston and cover the waterproof ventilated membrane of bleeder vent, the guide arm is equipped with the atmospheric pressure balance subassembly in ventilative centre bore lower extreme, the atmospheric pressure balance subassembly is including sealed pad and the sealed lid that is used for the shutoff ventilative centre bore, locates between sealed lid upper end and the guide arm the upper spring, locates the backing sheet of sealed pad lower terminal surface, is fixed in lower blanking cap of ventilative centre bore lower extreme, installs the lower spring between lower blanking cap and backing sheet, and lower blanking cap has central hole site. The balance explosion-proof valve has the following defects:

firstly, the guide rod and the piston are designed in a split manner, and on the design principle, the joint of the guide rod and the piston is required to have sealing performance, otherwise, the air pressure balance assembly loses the function;

secondly, the bottom structure of the guide rod bottom is complex, the guide rod is formed by turning and milling, a large number of CNC (computer numerical control) machining procedures are added to the complex structure, and the manufacturing cost is greatly increased;

the piston is provided with the vent grooves on the upper surface of the edge part of the piston, and the piston is formed by turning and milling, so that the CNC machining amount is increased due to the increase of the structure of the vent grooves, the manufacturing cost is increased, and the sawtooth structure is generally arranged on the surface of the edge part of the piston, and the machining amount is also increased.

SUMMERY OF THE UTILITY MODEL

In view of the foregoing, it is desirable to provide a balanced explosion-proof valve that is less costly to manufacture.

For solving above-mentioned technical problem, the application provides a balanced explosion-proof valve, including the valve body, assemble in the pressure release subassembly of valve body upside and assemble in the atmospheric pressure balance subassembly of pressure release subassembly downside, the valve body includes valve outer lane body, valve inner lane body and connection valve outer lane body internal face with a plurality of linking arms of valve inner lane body surface, be formed with a plurality of pressure release holes between valve outer lane body and the valve inner lane body, the valve inner lane body link up from top to bottom and is formed with central trepanning, pressure release subassembly include the crimping in piston, periphery on the valve outer lane body surface combine in waterproof ventilated membrane on the piston and cover in upper cover plate on the piston, atmospheric pressure balance subassembly install in the piston downside passes central trepanning, the piston include the inner cavity, certainly the crimping step that the inner cavity periphery upwards protrudes the formation reaches certainly the outer loop portion that the crimping step outer fringe upwards protrudes the formation, the periphery of waterproof ventilated membrane is fixed in on the crimping step and cover the inner cavity, the bottom surface of outer loop portion in the first sealing ring on valve outer lane body surface, the upper cover plate correspond to in waterproof ventilated groove intercommunication with external vent groove.

Preferably, the upper cover plate is formed at an outer periphery thereof with a lower protrusion, the vent groove is formed to penetrate the lower protrusion in a radial direction, and a lower surface of the lower protrusion is bonded to a surface of the outer ring.

Preferably, the surface of the lower protruding part is processed into a rough surface, and the rough surface contains glue and is fixedly bonded with the surface of the outer ring part.

Preferably, the cross section of the rough surface is of a sawtooth groove structure, and the sawtooth groove is provided with sawtooth grooves with various widths.

Preferably, a central portion of the upper cover plate is upwardly drawn and recessed, thereby forming the lower protrusion at an outer periphery of the upper cover plate, and the vent groove is directly punched at a bottom surface of the lower protrusion.

Preferably, the piece is inhaled including the magnetism to the pressure release subassembly, the periphery of piece is inhaled to the magnetism seted up a plurality of with the breach that the air channel corresponds, the breach is located waterproof ventilated membrane top and intercommunication are external, piece periphery card is inhaled to the magnetism is gone into in the space that the lower protruding portion of upper cover plate enclosed, at least one breach both sides of piece are inhaled to the magnetism is formed with a pair of elasticity buckle piece along the radial outside protrusion, elasticity buckle piece card is gone into the corresponding breach internal fixation.

Preferably, the air pressure balancing assembly comprises a guide rod penetrating through the central sleeve hole, a lower plug cover screwed on the lower end of the guide rod and a balance valve arranged in the guide rod and the lower plug cover, the lower end of the guide rod is upwards provided with a balance cavity, the lower plug cover is downwards provided with a plug cover cavity, the balance valve is arranged in the balance cavity and the plug cover cavity, the guide rod is vertically communicated with a central hole for communicating the waterproof breathable film and the balance cavity, the periphery of the lower plug cover is radially protruded to form an outer convex ring, the guide rod is sleeved with a pressure relief spring, and the pressure relief spring is supported between the valve inner ring body and the outer convex ring of the lower plug cover.

Preferably, guide arm lower extreme periphery is equipped with screw thread portion, the blanking cover is still including enclosing and establishing outer wall of chamber, the chamber diapire in the blanking cover chamber and link up from top to bottom the through-hole of chamber diapire, be equipped with screw thread portion on the inner wall face of blanking cover chamber upper end, the screw thread portion screw fit of lower blanking cover on the screw thread portion on the surface of guide arm lower extreme, the evagination ring is certainly outer wall lower extreme is along the radial outside protrusion formation.

Preferably, the balance valve comprises a balance plug, a sealing gasket, a rigid gasket, an upper spring and a lower spring, wherein the sealing gasket is larger in outer diameter than the balance plug and is stacked on the lower side of the balance plug, the rigid gasket is stacked on the lower side of the sealing gasket, the upper spring is abutted against the upper side of the balance plug and the top surface of the balance cavity, and the lower spring is supported between the rigid gasket and the bottom wall of the cavity.

Preferably, balanced stopper include the external diameter and be less than balanced intracavity internal diameter balanced stopper body, certainly balanced stopper body protrusion downwards extends the extension rod that forms, sealed pad with be formed with the perforation in the middle of the rigid gasket, sealed pad with the rigid gasket passes through the perforation cover is located on the extension rod, the fenestrate internal diameter is greater than the external diameter of extension rod, sealed pad adopts flexible material to make, the sealed upper surface of pad with the lower terminal surface laminating of guide arm is sealed together.

This application will the air channel is located on the upper cover plate, and upper cover plate simple structure can form through punching press, tensile technology manufacturing, and the piston need form through precision finishing, and prior art locates air channel and the rough surface in surface scheme manufacturing cost on the piston higher, and the technical scheme of this application compares in prior art can reduce manufacturing cost, reinforcing product competitiveness.

Drawings

The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application.

Example one

FIG. 1 is a perspective view of a balance explosion proof valve assembled on a power battery housing according to an embodiment;

FIG. 2 is a perspective view of a valve body of a balanced explosion proof valve according to an embodiment;

FIG. 3 is an exploded perspective view of the balanced explosion-proof valve of the embodiment;

FIG. 4 is a cross-sectional view of the embodiment of a balanced explosion-proof valve in an exploded state of FIG. 3;

FIG. 5 is a perspective view of a piston of an embodiment of a balanced explosion proof valve;

FIG. 6 is a perspective view of the balanced explosion-proof valve of the embodiment with an upper cover plate removed;

FIG. 7 is a sectional view of the balanced explosion-proof valve of the embodiment in an assembled state;

FIG. 8 is a schematic view of the embodiment with a balanced explosion-proof valve in a negative pressure state;

FIG. 9 is a schematic view of the balanced explosion-proof valve of the embodiment in a positive pressure state;

FIG. 10 is a schematic view of an embodiment of a balanced explosion proof valve in a pressure relief state;

example two

FIG. 11 is a sectional view of the embodiment in a state where two balanced explosion proof valves are combined;

EXAMPLE III

FIG. 12 is a sectional view of the embodiment in a disassembled state of the triple balanced explosion vent;

FIG. 13 is an exploded perspective view of the piston, magnetic attraction plate and upper cover plate of the three-balanced explosion-proof valve of the embodiment;

FIG. 14 is an exploded perspective view of the piston, the magnetic attraction piece and the upper cover plate of the balanced explosion-proof valve of the embodiment at another angle;

FIG. 15 is a perspective view of the magnetic attraction piece of the three-balanced explosion-proof valve of the embodiment assembled on the upper cover plate;

FIG. 16 is a sectional view of the piston, the waterproof breathable membrane, the pressure ring, the magnetic attraction sheet and the upper cover plate of the three-balanced explosion-proof valve of the embodiment in a combined state;

example four

FIG. 17 is an exploded perspective view of the piston, magnetic suction piece and upper cover plate of the four-balanced explosion-proof valve of the embodiment;

FIG. 18 is an exploded perspective view of the piston, magnetic attraction piece and upper cover plate of the four-balanced explosion-proof valve of the embodiment at another angle;

FIG. 19 is a sectional view of the piston, the waterproof and breathable membrane, the pressure ring, the magnetic attraction sheet and the upper cover plate of the four-balanced explosion-proof valve of the embodiment in a combined state;

EXAMPLE five

Fig. 20 is an exploded perspective view of the piston, magnetic attraction piece and upper cover plate of the five-balance explosion-proof valve of the embodiment.

Description of the reference numerals

A battery case-A; a valve body-10; a valve outer ring body-11; outer ring lower part-111; outer ring upper-112; a valve inner ring body-12; an outer slot-121; a connecting arm-13; a pressure relief vent-14; a central trepan boring-15; an upper seal ring groove-16; a lower seal ring groove-17; a fixing ear-18; a first seal ring-101; a second seal ring-102; a pressure relief assembly-20; a piston-21; an outer ring portion-211; rough surface-2111, 2112; an interior cavity-212; a crimping step-213; snap step-214; a central aperture-215; vent channel-216, 252; -218, a threaded bore; waterproof breathable film-22; a pressure ring-23; magnetic attraction pieces-24; a notch-241; an elastic buckling block-242; middle-243; a union outer ring-244; pleat-245; an upper cover plate-25; a lower projection-251; a gas pressure balancing assembly-30; a guide rod-31; a balance cavity-311; -312, 336 threaded portion; a binding head-313; a protective shell-32; a lower blanking cover-33; an outer cavity wall-331; an outer convex ring-332; a cap blocking cavity-333; a cavity bottom wall-334; a through-hole-335; an upper spring-341; a lower spring-342; a pressure relief spring-35; -36 balance valve; a balanced plug-361; an upper stopper-3611; balance plug-3612; extension rod-3613; collar-3614; a gasket-362; a rigid shim-363; perforations-364.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more apparent, the technical solutions of the present application will be described in detail and completely with reference to the following specific embodiments of the present application and the accompanying drawings.

Referring to fig. 1, the balance explosion-proof valve of the present application is applied to a power battery, and the balance explosion-proof valve is mounted on a battery shell a of the power battery. The power battery mainly realizes two functions, namely when the internal pressure of the power battery fluctuates in a small range, the internal pressure and the external pressure of the power battery are balanced, and the waterproof and dustproof effects are realized; and secondly, when the pressure in the power battery is increased sharply, the pressure in the power battery is released quickly, so that the pressure relief capacity is achieved, and the power battery is prevented from being exploded.

Example one

Referring to fig. 1 to 5 and 7, a balanced explosion-proof valve according to a first embodiment includes a valve body 10, a pressure relief assembly 20 assembled in the valve body 10, and an air pressure balancing assembly 30.

The battery shell 10 is provided with a mounting hole, and the valve body 10 is fixed on the periphery of the mounting hole. The valve body 10 comprises an outer valve ring body 11, an inner valve ring body 12 positioned in the middle of the outer valve ring body 11, and a plurality of connecting arms 13 connecting the outer valve ring body 11 and the inner valve ring body 12.

The valve outer ring body 11 includes an outer ring lower portion 111 and an outer ring upper portion 112 formed to extend upward from the outer ring lower portion 111. The thickness of the outer ring lower part 111 is greater than that of the outer ring upper part 112, and an upper seal ring groove 16 is formed on the upper surface of the outer ring lower part 111 at the inner side of the outer ring upper part 112. The bottom surface of the outer ring lower part 111 is provided with a lower seal ring groove 17. A pair of fixing lugs 18 are further integrally formed on the outer side of the valve outer ring body 11 in an extending manner, and the valve body 10 is fixed on the battery shell a through the fixing lugs 18.

The outer peripheral surface of the valve inner ring body 12 is opened with an outer groove 121 in the vertical direction. The connecting arm 13 connects the inner wall surface of the outer ring lower portion 111 and the outer surface of the valve inner ring body 12. The valve body 10 is machined by a metal integral lathe system, and the bottom surface of the valve inner ring body 12 is lower than that of the valve outer ring body 11. A first seal ring 101 and a second seal ring 102 are respectively pressed into the upper seal groove 16 and the lower seal groove 17. The top surface of the valve inner ring body 12 does not extend upwardly beyond the upper seal ring groove 16. A plurality of pressure relief holes 14 are formed between the valve outer ring body 11 and the valve inner ring body 12, a central sleeve hole 15 is formed in the middle of the valve inner ring body 12 in a vertically penetrating manner, and the pressure relief holes 14 are spaced by the connecting arm 13.

The pressure relief assembly 20 comprises a piston 21 elastically pressed on the first sealing ring 101, a waterproof breathable film 22, a pressing ring 23 for pressing the waterproof breathable film 22 on the piston 21, a magnetic attraction sheet 23 arranged on the piston 21, and an upper cover plate 25 attached to the upper surface of the piston 21.

Referring to fig. 5, the piston 21 includes an inner recess 212, a press-fit step 213, a snap step 214, and an outer ring 211. The surface horizontal position, from bottom to top, is in proper order concave part 212, crimping step 213, buckle step 214 and outer loop portion 211, namely the surface of outer loop portion 211 is higher than the surface of buckle step 214, the surface of buckle step 214 is higher than the surface of crimping step 213, the surface of crimping step 213 is higher than the surface of concave part 212. The bottom surface of the outer ring portion 211 is higher than the upper surface of the crimping step 213. The bottom surface of the outer ring portion 211 is pressed on the first seal ring 101 and supported by the surface of the outer ring lower portion 111, the bottom surface of the outer ring portion 211 and the outer ring lower portion 111 clamp the first seal ring 101 to achieve sealing, the clamping force between the bottom surface of the outer ring portion 211 and the outer ring lower portion 111 is the elastic force of a spring, specifically, the lower portion of the inner concave portion 212 is connected or extends downwards to form a limiting component, a pressure relief spring 35 is sleeved outside the limiting component, and the pressure relief spring 35 is clamped between the lower end of the valve inner ring body 12 and the limiting component, so that the piston 21 is tensioned on the upper side of the outer ring lower portion 111 by the elastic force.

As shown in fig. 10, when the pressure in the power battery is greater than the critical value of the elastic force of the pressure relief spring 35, the high-pressure gas in the battery pushes the piston 21 upward and away from the valve body 10, so that the high-pressure gas flows through the pressure relief hole 14 and overflows outward to release the internal pressure of the battery, thereby preventing the internal pressure of the battery from being too high and exploding.

The upper surface of the outer ring 211 is radially provided with a plurality of vent grooves 216, and the upper surface of the outer ring 211 is roughened to form rough surfaces 2111,2112, for example, a plurality of saw tooth grooves are provided along the arc direction, including a deeper saw tooth groove 2111 and a shallower saw tooth groove 2112. The bottom of the inner concave cavity 212 of the piston 21 extends downwards to form a guide rod 31, the lower end of the guide rod 31 is open and is provided with a balance cavity 311 upwards, and the outer side of the lower end of the guide rod 31 is provided with a threaded part 312. A central hole 215 communicating the inner cavity 212 and the balance cavity 311 is formed in the middle of the inner cavity 212 in a vertical direction.

Referring to fig. 6 and 7, the waterproof breathable membrane 22 is pressed on the pressing step 213 by the pressing ring 23 and covers the inner cavity 212, so that the central hole 215 is closed by the waterproof breathable membrane 22. The outer diameter of the pressing ring 23 is slightly larger than the inner diameter of the crimping step 213, and the pressing ring 23 is riveted on the crimping step 213 and fixes the periphery of the waterproof breathable film 22. The magnetic suction sheet 24 is pressed in the buckling step 214, a notch 241 is arranged at the position, corresponding to the vent groove 216, of the periphery of the magnetic suction sheet 24, and the notch 214 is communicated with the upper side of the waterproof breathable film 22 and the vent groove 216. At least one of the notches 214 has a pair of elastic locking pieces 242 formed on both sides thereof in a radial direction, and the elastic locking pieces 242 protrude in the radial direction and are locked in one of the ventilation grooves 216 to enhance the fixing and positioning of the magnetic attraction pieces 24. The upper cover plate 25 is fixed on the upper surface of the outer ring portion 211 in an adhering mode, and the rough surfaces 2111 and 2112 on the upper surface of the outer ring portion 211 are used for containing glue so that the upper cover plate 25 can be tightly attached to the rough surfaces 2111 and 2112.

As shown in fig. 3, 4 and 7, the air pressure balancing assembly 30 includes the guide rod 31, a lower cap 33 fixed at the bottom of the guide rod 31, a balancing valve 36 installed between the guide rod 31 and the lower cap 33, an upper spring 341, a lower spring 342 and a protective shell 32.

The upper end of the lower blocking cover 33 is opened and is provided with a blocking cover cavity 333, and the inner wall surface of the blocking cover cavity 333 is provided with a thread part 336 so that the lower blocking cover 33 is screwed on the thread part 312 at the lower end of the guide rod 31. The two ends of the upper spring 341 respectively abut against the top of the balance cavity 311 and the upper surface of the balance valve 36, and the two ends of the lower spring 342 respectively abut against the bottom of the balance valve 36 and the bottom surface of the cap blocking cavity 333.

The balanced valve 36 includes a balanced plug 361, a gasket 362, and a rigid gasket 363. The balance plug 361 includes a balance plug body 3612, an upper stopper 3611 formed by protruding upward from the top of the balance plug body 3612, and an extension rod 3613 formed by extending downward from the lower side of the balance plug body 3612. The outer diameter of the balance plug body 3612 is not larger than the inner diameter of the balance cavity 311, the outer diameter of the upper limit portion 3611 is smaller than the outer diameter of the balance plug body 3612, and the outer diameter of the extension rod 3613 is smaller than the outer diameter of the upper limit portion 3611. One end of the upper spring 341 is sleeved outside the upper limiting portion 3611, and the balance plug body 3612 enters the balance cavity 311. The bottom surface of the balance plug body 3612 is also provided with a convex edge 3614 at the periphery thereof.

A through hole 364 is formed between the sealing pad 362 and the rigid gasket 363, the sealing pad 362 and the rigid gasket 363 are sequentially sleeved on the extension rod 3613, and the inner diameter of the through hole 364 is larger than the outer diameter of the extension rod 3613. The sealing gasket 362 is made of a flexible waterproof material, and the outer diameter of the sealing gasket 362 is larger than the inner diameter of the balance cavity 311 and smaller than the outer diameter of the guide rod 31 or the inner diameter of the cover blocking cavity 333. The upper end of the lower spring 342 abuts against the rigid gasket 363, and the gasket 362 is pressed and attached to the end surface of the guide rod 31 by the rigid gasket 363 and the lower spring 342 to realize sealing.

The lower plug cover 33 further includes a cavity outer wall 331, a cavity bottom wall 334, an outer convex ring 332 formed by protruding from the periphery of the lower side of the cavity outer wall 331, and a through hole 335 vertically penetrating through the cavity bottom wall 334. Two ends of the pressure relief spring 35 respectively abut against the valve inner ring body 12 and the convex ring 332. The guide rod 31 and the lower cap 33 constitute the aforementioned stopper.

The protective shell 32 is a cup-shaped structure and is upwardly sleeved on the periphery of the valve inner ring body 12, and specifically, the guide rod 31, the lower blocking cover 33 and components therein are protected by the protective shell 32. And the inner wall surface of the protective shell 32 is bonded and fixed to the outer surface of the valve inner ring body 12. The outer groove 121 communicates the battery interior with the space inside the protective case 32.

The air pressure balancing assembly 30 is used for balancing the pressure inside and outside the battery, that is, when the inside of the battery is negative pressure or the internal pressure is less than a pressure relief critical value, the air pressure inside and outside the battery is kept balanced.

When the negative pressure inside the battery reaches a critical value, that is, when the pressure inside the battery overcomes the elastic force of the lower spring 342, as shown in fig. 8, the external air pressure pushes the balance valve 36 downward to press the lower spring 342, the sealing gasket 36 is separated from the end surface of the guide rod 31 and loses the sealing effect, the external air enters the piston 21 through the vent groove 216, and after penetrating through the waterproof breathable film 22, the external air reaches the balance cavity 311 downward from the central hole 215, enters the cover blocking cavity 333 along the periphery of the balance valve 36, and then enters the inside of the battery through the through hole 335 and the outer groove 121 to realize air pressure balance.

When the positive pressure inside the battery reaches a critical value, that is, when the internal pressure of the battery overcomes the elastic force of the upper spring 341, as shown in fig. 9, the internal pressure of the battery pushes the balance valve 36 upward, so that the balance plug 361 of the balance valve 36 rises upward, and at this time, the air flow inside the battery enters the balance cavity 311 from the cover blocking cavity 333 along the gap between the extension rod 3613 and the through hole 364, and then flows out through the gap between the balance plug 361 and the inner wall surface of the balance cavity 311, the central hole 215, the waterproof breathable film 22, and the vent groove 216, so that the internal and external pressures of the battery are balanced.

In the first embodiment, the guide rod 31 is integrally formed with the piston 21, so that the problem of sealing between the guide rod 31 and the piston 21 when the guide rod is combined with the piston is avoided, and the structural stability of the product is improved. Meanwhile, the lower blocking cover 33 is fixed at the lower end of the guide rod 31 and supports one end of the pressure relief spring 35, so that the structural complexity of the balance cavity 311 of the guide rod 31 can be effectively reduced, and the processing difficulty of the guide rod 31 or the piston 21 is reduced.

Example two

Referring to fig. 11 and 12, compared with the first embodiment, the difference of the second embodiment is that the piston 21 and the guide rod 31 are in a split structure, at this time, a threaded hole 218 is formed in the middle of the inner concave cavity 212, an upper end edge of the guide rod 31 is provided with a coupling head 313, and the coupling head 313 is screwed into the threaded hole 218. In this structure, when the guide rod 31 is screwed into the threaded hole 218, a seal ring is interposed between the guide rod 31 and the piston 21 to achieve sealing performance between the piston 21 and the guide rod 31. Or waterproof glue is coated at the joint of the piston 21 and the guide rod 31 to realize sealing. In this embodiment, the central hole 215 passes through the guide rod 31 up and down.

EXAMPLE III

Referring to fig. 12 to 16, the difference between the third embodiment and the second embodiment is that the rough surfaces 2111 and 2112 and the vent groove 216 formed on the outer ring portion 211 of the piston 21 are eliminated and formed on the upper cover plate 25. Specifically, the upper cover plate 25 is formed with a lower protrusion 251 protruding downward from the outer circumference thereof, the surface of the lower protrusion 251 is formed with a rough surface, and the lower protrusion 251 is formed with a vent groove 252 penetrating in the radial direction.

The magnetic attraction piece 24 is buckled in the upper cover plate 25, that is, the elastic buckling block 242 is buckled in the ventilation groove 252. The elastic fastening block 242 is a pair of elastic members, which are riveted into the ventilation groove 252 to fix the magnetic attraction sheet 24 to the upper cover plate 25, and the notch 241 is located above the waterproof breathable film 22 in the vertical direction to realize ventilation.

In the present embodiment, the vent groove 252 is disposed on the upper cover plate 25, the upper cover plate 25 has a simple structure and can be manufactured by stamping and drawing processes, the piston 21 needs to be manufactured by CNC precision machining, and the vent groove 216 and the rough surfaces 2111 and 2112 thereof in the second embodiment have higher machining cost, compared with the technical solution in which the vent groove 252 is disposed on the piston 21, the manufacturing cost of the solution of the present embodiment can be greatly reduced, and the product competitiveness can be enhanced.

In this embodiment, the middle portion of the upper cover plate 25 may be pressed and drawn upwards to form an upward concave portion, and the edge portion of the upper cover plate 25 may be the lower convex portion 251 and the vent groove 252 may be opened.

Example four

Referring to fig. 17 to 19, compared to the second embodiment, the fourth embodiment is different in that the vent groove 216 is not formed on the outer annular portion 211 of the piston 21. The upper surface of the outer ring portion 211 is also provided with rough surfaces 2111 and 2112 for accommodating glue. The outer diameter of the magnetic attraction piece 24 is enlarged to at least partially cover the upper surface of the outer ring portion 211, so that the magnetic attraction piece 24 comprises a middle portion 243 suspended above the waterproof breathable film 22 and a combined outer ring 244 formed by protruding from the outer periphery of the middle portion 243, and the notch 241 penetrates the combined outer ring 244 from the middle portion 243 outwards in the radial direction. The middle portion 243 is recessed downward to form a recessed structure so that the middle portion 243 can be positioned downward to snap over the crimping step 213. The combined outer ring 244 is clamped between the outer ring 211 and the upper cover plate 25 and is bonded and fixed, and the edges of the outer ring 211 and the upper cover plate 25 are both provided with rough surfaces or sawtooth structures to contain glue, so that the combining force is enhanced. And the notch 241 is communicated with the waterproof breathable film 22 and the outside along the radial direction to realize ventilation.

In the embodiment, the outer diameter of the magnetic attraction sheet 24 is enlarged to form the combination outer ring 244, so that the combination outer ring 244 is clamped between the outer ring 211 and the upper cover plate 25, and the notch 241 of the magnetic attraction sheet 24 replaces the ventilation function of the ventilation grooves 216 and 252, thereby simplifying the structure of the piston 21 or the upper cover plate 25, and the magnetic attraction sheet 24 has a simple structure, is directly punched and has lower manufacturing cost.

EXAMPLE five

Referring to fig. 20, compared with the fourth embodiment, the difference of the present embodiment is that the edge of the upper cover plate 25 and the surface of the outer ring portion 211 of the piston 21 are not provided with rough surfaces, but the combined outer ring 244 of the magnetic attraction sheet 24 is punched to form wrinkles 245, so that the upper and lower surfaces of the combined outer ring 244 of the magnetic attraction sheet 24 form rough surfaces or saw tooth structures, and the combined outer ring 244, the upper cover plate 25 and the outer ring portion 211 of the piston 21 are firmly bonded.

In this embodiment, the combination outer ring 244 of the magnetic attraction sheet 24 is pressed to form the wrinkles 245, so that the upper and lower surfaces of the combination outer ring 244 form rough surfaces, which is lower in manufacturing cost than the case where rough surfaces are respectively provided on the outer ring 211 and the upper cover plate 25.

The above description is only an example of the present application and is not intended to limit the present application. Various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.

Claims (10)

1. The utility model provides a balanced explosion-proof valve, includes the valve body, assemble in the pressure release subassembly of valve body upside and assemble in the atmospheric pressure balance subassembly of pressure release subassembly downside, the valve body includes valve outer lane body, valve inner lane body and connection valve outer lane body internal face with a plurality of linking arms of valve inner lane body surface, be formed with a plurality of pressure release holes between valve outer lane body and the valve inner lane body, the valve inner lane body link up from top to bottom and is formed with central trepanning, pressure release subassembly include the crimping in piston, periphery on the valve outer lane body surface combine in waterproof ventilated membrane on the piston and cover in upper cover plate on the piston, atmospheric pressure balance subassembly install in the piston downside passes central trepanning, its characterized in that, the piston include the inner cavity, certainly the crimping step that the periphery of inner cavity upwards protrudes and forms and certainly the outer loop portion that the upwards protrusion formed in crimping step outer fringe, the periphery of waterproof ventilated membrane is fixed in on the crimping step and cover the inner cavity, the crimping bottom surface of outer loop portion in the first sealed circle of valve body surface, the upper cover plate corresponding to the intercommunication waterproof outer lane and external vent groove.

2. The balanced explosion vent valve as defined in claim 1 wherein said upper cover plate is formed at its periphery with a lower projection, said vent slot being formed radially through said lower projection, the lower surface of said lower projection being bonded to the surface of said outer ring.

3. The balanced explosion proof valve of claim 2 wherein said lower projection is surface treated to a roughened surface, said roughened surface receiving glue and being adhesively secured to said outer ring portion surface.

4. The balanced explosion vent valve as defined in claim 3, wherein said roughened surface has a cross-section of a saw-tooth groove structure, said saw-tooth groove having a plurality of widths of saw-tooth grooves.

5. The balanced explosion vent valve as set forth in claim 2, wherein said upper cover plate has a central portion which is upwardly drawn to be depressed, whereby said lower projection is formed at the outer periphery of said upper cover plate, and said vent groove is directly punched at the bottom surface of said lower projection.

6. The balanced explosion-proof valve of claim 2, wherein the pressure relief assembly further comprises a magnetic suction piece, a plurality of notches corresponding to the vent grooves are formed in the periphery of the magnetic suction piece, the notches are located above the waterproof breathable film and communicated with the outside, the periphery of the magnetic suction piece is clamped into a space surrounded by the lower protruding portion of the upper cover plate, a pair of elastic clamping blocks is formed by protruding two sides of at least one notch of the magnetic suction piece along the radial outer side, and the elastic clamping blocks are clamped into the corresponding notches and fixed.

7. The balanced explosion-proof valve of claim 1, wherein the air pressure balancing assembly comprises a guide rod passing through the central sleeve hole, a lower plug cover screwed on the lower end of the guide rod, and a balance valve installed in the guide rod and the lower plug cover, the lower end of the guide rod is provided with a balancing cavity upwards, the lower plug cover is provided with a plug cover cavity downwards, the balance valve is installed in the balancing cavity and the plug cover cavity, the guide rod is vertically penetrated to form a central hole communicating the waterproof breathable film and the balancing cavity, an outer convex ring is radially protruded on the periphery of the lower plug cover, a pressure relief spring is sleeved outside the guide rod, and the pressure relief spring is supported between the valve inner ring body and the outer convex ring of the lower plug cover.

8. The balanced explosion-proof valve according to claim 7, characterized in that the periphery of the lower end of the guide rod is provided with a threaded portion, the blanking cap further comprises a cavity outer wall, a cavity bottom wall and a through hole which vertically penetrates through the cavity bottom wall, the cavity outer wall and the cavity bottom wall are arranged in a surrounding mode, the threaded portion is arranged on the inner wall surface of the upper end of the blanking cap cavity, the threaded portion of the lower blanking cap is screwed on the threaded portion on the outer surface of the lower end of the guide rod, and the outer convex ring is formed by protruding outwards in the radial direction from the lower end of the cavity outer wall.

9. The balanced explosion vent valve as set forth in claim 8, wherein said balanced valve includes a balanced plug, a gasket having an outer diameter greater than said balanced plug and laminated to an underside of said balanced plug, a rigid gasket laminated to an underside of said gasket, an upper spring supported against an upper side of said balanced plug and a top surface of said balanced chamber, and a lower spring supported between said rigid gasket and a bottom wall of said chamber.

10. The balanced explosion-proof valve as recited in claim 9 wherein the balanced plug includes a balanced plug body having an outer diameter smaller than the inner diameter of the balanced chamber, and an extension rod formed by extending the balanced plug body in a downward protruding manner, a through hole is formed between the sealing pad and the rigid gasket, the sealing pad and the rigid gasket are sleeved on the extension rod through the through hole, the inner diameter of the through hole is larger than the outer diameter of the extension rod, the sealing pad is made of a flexible material, and the upper surface of the sealing pad is attached to the lower end surface of the guide rod for sealing.

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