CN218582359U - 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 below, the valve body includes outer circle body of valve, the inner circle body of valve and connects outer circle internal face of valve with a plurality of linking arms of inner circle external surface of valve, the pressure release subassembly include piston, periphery combine in waterproof ventilated membrane on the piston and cover in upper cover plate on the piston, the atmospheric pressure balance subassembly including connect in the piston downside guide arm, be fixed in the lower blanking cover of guide arm lower extreme and install in the guide arm with the balanced valve in the blanking cover down, link up from top to bottom and be formed with the intercommunication the centre bore of waterproof ventilated membrane, blanking cover lower part periphery is formed with the evagination ring along radial protrusion, the guide arm overcoat is equipped with the pressure release spring, the pressure release spring support in the inner circle body of valve with between the evagination ring. The application can reduce the processing difficulty.

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. Patent application No. 202121092721.1 of the people's republic of china discloses a balanced explosion-proof valve, the balanced explosion-proof valve includes a valve body, a guide rod penetrating the valve body, a spring arranged between the valve body and the guide rod, and a piston fixed at the end of the guide rod, a vent hole corresponding to the vent hole of the guide rod is arranged on the piston, a waterproof breathable film covering the vent hole is arranged on the piston, a pressure balancing component is arranged at the lower end of the vent hole of the guide rod, the pressure balancing component includes a sealing gasket and a sealing cover for sealing the vent hole, an upper spring arranged between the upper end of the sealing gasket and the guide rod, a support sheet arranged at the lower end face of the sealing gasket, a lower plug fixed at the lower end of the vent hole, and a lower spring arranged between the lower plug and the support sheet, and the lower plug has a central hole. 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 vent grooves are formed in the upper surface of the edge portion of the piston, the piston is machined by turning and milling, CNC machining amount is increased due to the increase of the structure of the vent grooves, manufacturing cost is increased, and the machining amount is also increased due to the fact that sawtooth structures are generally arranged on the surface of the edge portion of the piston.

SUMMERY OF THE UTILITY MODEL

In view of this, it is desirable to provide a balanced explosion-proof valve, in which a lower plug for supporting a pressure relief spring is added to the bottom of the guide rod, so as to effectively reduce the processing difficulty of the guide rod.

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 below, the valve body includes outer circle of valve body, inner circle of valve body and connection outer circle of valve body internal face with a plurality of linking arms of inner circle of valve body surface, be formed with a plurality of pressure release holes between outer circle of valve body and the inner circle of valve body, the inner circle of valve body link up from top to bottom and is formed with central trepanning, pressure release subassembly include the crimping in outer circle of valve body is surperficial piston, periphery combine in waterproof ventilated membrane on the piston and cover in upper cover plate on the piston, atmospheric pressure balance subassembly including connect in the guide arm of piston downside, be fixed in lower blanking cap of guide arm lower extreme and install in the guide arm with the balanced valve in the blanking cap down, link up from top to bottom the guide arm and be formed with the intercommunication the centre bore of waterproof ventilated membrane, blanking cap lower part periphery is formed with the evagination ring along radial protrusion, the guide arm overcoat is equipped with the pressure release spring, the pressure release spring support in the inner circle of valve with between the outer bulge ring.

Preferably, the lower end of the guide rod is open and is provided with a balance cavity upwards, the upper end of the lower plugging cover is open and is provided with a plugging cover cavity downwards, the balance valve is assembled in the balance cavity and the plugging cover cavity, and the balance valve can move up and down under the action of air pressure.

Preferably, guide arm lower extreme periphery is equipped with screw thread portion, the blanking cover is still including enclosing to establish outer wall of chamber, the chamber diapire in 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 of blanking cover chamber upper end, the screw thread portion screw fit of blanking cover down 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 formation of radial outside protrusion.

Preferably, the balance valve includes a balance plug, a seal pad having an outer diameter larger than that of the balance plug and stacked on a lower side of the balance plug, a rigid gasket stacked on a lower side of the seal pad, an upper spring abutting on an upper side of the balance plug and a top surface of the balance cavity, and a lower spring supported between the rigid gasket and a bottom wall of the cavity.

Preferably, balanced stopper include that the external diameter is less than balanced stopper body of balanced chamber internal diameter, certainly balanced stopper body downward protrusion extends the extension rod that forms, sealed fill up with be formed with the perforation in the middle of the rigid gasket, sealed fill up 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.

Preferably, the sealing gasket is made of a flexible material, and the upper surface of the sealing gasket is attached to the lower end surface of the guide rod for sealing.

Preferably, the piston includes an inner concave cavity, a pressing step formed by protruding upwards from the periphery of the inner concave cavity, and an outer ring portion formed by protruding upwards from the outer edge of the pressing step, the periphery of the waterproof breathable film is fixed on the pressing step and covers the inner concave cavity, a first sealing ring is arranged on the surface of the outer ring portion of the valve body, the bottom surface of the outer ring portion is pressed on the first sealing ring, a through vent groove is radially formed in the surface of the outer ring portion, and the upper cover plate is fixed on the surface of the outer ring portion.

Preferably, the guide rod and the piston are integrally processed, the guide rod is formed by downwardly protruding and extending from the bottom of the inner concave cavity, and the central hole penetrates through the guide rod up and down and is communicated with the inner concave cavity.

Preferably, the inner concave cavity is provided with a threaded hole, the upper end of the guide rod is provided with a combining head portion screwed in the threaded hole, and the combining head portion and the bottom surface of the inner concave cavity are clamped with a sealing ring.

Preferably, the piece is inhaled to the pressure release subassembly still including the magnetism, the periphery of piece is inhaled to the magnetism seted up a plurality of with the breach that the air channel corresponds, the breach intercommunication waterproof ventilated membrane and external, the outer loop inner edge undercut of piston is formed with the buckle step, piece periphery card is inhaled to the magnetism is gone into on the buckle step, piece both sides are inhaled to the magnetism along the outside protrusion in the radial direction and are formed with a pair of elasticity buckle piece, elasticity buckle piece card is gone into corresponding breach internal fixation.

This application is in under the guide arm increase blanking cover, through the outer bulge loop of blanking cover supports down the pressure release spring can effectively reduce the structure complexity of guide arm reduces the processing degree of difficulty of guide arm or piston.

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 the valve body of a balanced explosion-proof valve of the embodiment;

FIG. 3 is an exploded perspective view of a balanced explosion proof valve according to an 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 embodiment of a balanced explosion proof valve in an assembled state;

FIG. 8 is a schematic view of the balanced explosion-proof valve of the embodiment 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 of a three-balanced explosion-proof valve in a disassembled state;

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 and breathable membrane, the pressure ring, the magnetic suction 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 attraction 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 inner cavity-212; a crimping step-213; snap step-214; a central aperture-215; vent-216,252; -218, a threaded bore; a waterproof breathable film-22; a pressure ring-23; a magnetic attraction sheet-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 balancing chamber-311; -312, 336 threaded portion; a binding head-313; a protective shell-32; a lower plug cover-33; an outer luminal wall-331; an outer convex ring-332; a cover 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; a balance valve-36; a balanced plug-361; an upper stopper portion-3611; balance plug-3612; extension rod-3613; collar-3614; a gasket-362; a rigid shim-363; perforations-364.

Detailed Description

To make the objects, technical solutions and advantages of the present application more clear, the technical solutions of the present application will be clearly and completely described below with reference to 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 to achieve the pressure relief capacity so as to prevent the power battery from exploding.

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. The outside of valve outer ring body 11 still integrative extension is formed with a pair of fixed ear 18, valve body 10 passes through fixed ear 18 is fixed in on the battery case A.

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 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, clamping force between the bottom surface of the outer ring portion 211 and the outer ring lower portion 111 is 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 away from the valve body 10, so that the high-pressure gas flows through the pressure relief hole 14 to overflow 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 penetrating manner in the 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 third embodiment is different from the second embodiment in that the rough surfaces 2111 and 2112 and the vent groove 216 provided on the outer ring portion 211 of the piston 21 are eliminated and provided 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 precisely machined by CNC, and the vent groove 216 and the rough surfaces 2111 and 2112 thereof in the second embodiment have higher machining cost, so that compared with the technical scheme in which the vent groove 252 is disposed on the piston 21, the manufacturing cost of the scheme of the present embodiment can be greatly reduced, and the product competitiveness is 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 snaps downward into position 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 piece 24 is expanded to form the coupling outer ring 244, so that the coupling outer ring 244 is clamped between the outer ring 211 and the upper cover plate 25, and the notch 241 of the magnetic attraction piece 24 replaces the ventilation function of the ventilation groove 216,252, thereby simplifying the structure of the piston 21 or the upper cover plate 25, and the magnetic attraction piece 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 pressed 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 rough surfaces 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 or the like made within the spirit and principle of the present application shall 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 below, the valve body includes outer valve body, inner valve body and connects outer valve body internal face with a plurality of linking arms of inner valve body surface, be formed with a plurality of pressure release holes between outer valve body and the inner valve body, the inner valve body link up from top to bottom and is formed with the center sleeve hole, pressure release subassembly include the crimping in piston, periphery on the outer valve body surface combine in waterproof ventilated membrane on the piston and cover in the upper cover plate on the piston, its characterized in that, atmospheric pressure balance subassembly including connect in the guide arm of piston downside, be fixed in the lower blanking cap of guide arm lower extreme and install in the guide arm with the balanced valve in the blanking cap down, link up from top to bottom and be formed with the intercommunication the centre bore of waterproof ventilated membrane, blanking cap lower part periphery is formed with the evagination ring along radial protrusion, the guide arm overcoat is equipped with the pressure release spring, the pressure release spring support in the inner valve body with between the evagination ring.

2. The balanced explosion-proof valve as claimed in claim 1, wherein the lower end of the guide rod is open and has a balanced cavity opened upward, the upper end of the lower cap is open and has a cap cavity opened downward, the balanced valve is assembled in the balanced cavity and the cap cavity, and the balanced valve can move up and down under the action of air pressure.

3. The balanced explosion-proof valve according to claim 2, 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.

4. The balanced explosion vent valve as set forth in claim 3, wherein said balanced valve includes a balanced plug, a gasket having an outer diameter larger than said balanced plug and laminated on the underside of said balanced plug, a rigid gasket laminated on the underside of said gasket, an upper spring supported against the upper side of said balanced plug and the top surface of said balanced chamber, and a lower spring supported between said rigid gasket and the bottom wall of said chamber.

5. The balanced explosion proof valve as recited in claim 4 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 downwardly protruding and extending from the balanced plug body, 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, and the inner diameter of the through hole is larger than the outer diameter of the extension rod.

6. The balanced explosion-proof valve of claim 5 wherein said gasket is made of a flexible material, and the upper surface of said gasket is sealed by being attached to the lower end surface of said guide rod.

7. The balanced explosion-proof valve as recited in claim 1, wherein the piston includes an inner cavity, a pressing step formed by protruding upward from a periphery of the inner cavity, and an outer ring portion formed by protruding upward from an outer edge of the pressing step, a periphery of the waterproof breathable film is fixed on the pressing step and covers the inner cavity, a first sealing ring is arranged on a surface of the outer ring portion of the valve, a bottom surface of the outer ring portion is pressed on the first sealing ring, a through vent groove is radially formed on the surface of the outer ring portion, and the upper cover plate is fixed on the surface of the outer ring portion.

8. The balanced explosion vent as defined in claim 7 wherein said guide stem is integrally formed with said piston, said guide stem extending downwardly from the bottom of said interior cavity, said central opening extending up and down through said guide stem and communicating with said interior cavity.

9. The balanced explosion-proof valve as recited in claim 7 wherein the inner concave cavity is provided with a threaded hole, the upper end of the guide rod is provided with a combination head part screwed in the threaded hole, and the combination head part and the bottom surface of the inner concave cavity are clamped with a sealing ring.

10. The balanced explosion-proof valve according to claim 7, wherein the pressure relief assembly further comprises a magnetic absorption piece, a plurality of notches corresponding to the vent grooves are formed in the periphery of the magnetic absorption piece, the notches communicate the waterproof breathable film with the outside, a fastening step is formed by downward depression of the inner edge of the outer ring portion of the piston, the periphery of the magnetic absorption piece is clamped into the fastening step, a pair of elastic fastening blocks are formed by protruding radially outward on two sides of at least one notch of the magnetic absorption piece, and the elastic fastening blocks are clamped into the corresponding notches and fixed.

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