CN212131424U - Safety valve capable of automatically breaking when excessive load is applied - Google Patents

Abstract

The utility model relates to the technical field of valves, in particular to a safety valve with excessive automatic circuit breaking, which comprises an elastic sealing chamber structure, a lever on-off structure and an overcurrent circuit breaking device, wherein the elastic sealing chamber structure comprises a base body, an elastic sealing gasket, a sealing chamber spring and an installation bowl body; the lever on-off structure comprises an air nozzle piece, a transmission lever and a through-closing sliding plug, wherein the through-closing sliding plug is arranged on the sliding pipe part in a sliding mode, one end of the through-closing sliding plug is connected with one end of the transmission lever, and the lever on-off structure further comprises an upper floating piece and a lower floating piece which provide power for rotation of the transmission lever; the overcurrent breaking device comprises a floating ball, a ball chamber, an elastic restoring piece and a buffer storage chamber. The utility model discloses a relief valve of excessive automatic cutout, when the gas leakage takes place for the low reaches, can realize automatic cutout, avoid the too much leakage of gas, realize the safety protection function.

Description

Safety valve capable of automatically breaking when excessive load is applied

Technical Field

The utility model relates to the technical field of valves, especially, relate to an excessive relief valve that opens circuit automatically.

Background

The gas valve is widely applied as a device for controlling the on-off of gas, and is often used between a household gas pipeline and a gas stove connecting hose to control the on-off of gas. The general process of gas leakage, which is highly susceptible to fires and explosions, is generally that gas slowly leaking into a space reaches the ignition point and then starts to catch fire, after which the high temperature causes the connecting hose to melt or the gas valve to leak and then more gas to leak, and then an explosion or a more severe fire occurs. For solving this problem, current can be at the gas valve of automatic circuit break under high temperature, nevertheless this gas valve can only suffer to burn at gas valve itself, temperature rise after can play a role, the situation that the mounted position of gas valve is difficult for being burnt by the fire often appears in the actual conditions, leads to even the gas leaks and leads to catching fire, and because the gas valve is not burnt by the fire leads to its temperature to fail to reach the value of circuit break, leads to the phenomenon that this automatic circuit break's gas valve still became invalid under the high temperature.

Therefore, there is a need for an excess shutoff gas valve that automatically shuts off when the flow of gas through the valve body exceeds a certain flow rate, thereby avoiding leakage of more gas.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a relief valve that excessive automatic circuit-breaking is not enough to prior art, when the gas leakage takes place at downstream, can realize automatic circuit-breaking, avoid the gas too much to leak, realize the safety protection function.

In order to achieve the above object, the present invention provides an excessive automatic open-circuit safety valve, which comprises an elastic sealing chamber structure, wherein the elastic sealing chamber structure comprises a base body seat, an elastic sealing gasket, a sealing chamber spring and an installation bowl body, the base body seat is provided with a planar base body part, the planar base body part is upwardly arched to form an air channel, and the elastic sealing gasket is provided with a horizontal part, a sealing ring annular edge part and a conical surface deformation part connecting the sealing ring annular edge part and the horizontal part; the horizontal part and the sealing ring edge part are not on the same horizontal plane; the outer edge of the plane base body part extends downwards to form an annular boss, and the annular boss is sunken inwards to form an annular groove; the sealing ring is characterized in that the ring edge part of the sealing ring is arranged in the ring groove, the elastic sealing gasket is arranged with a horizontal part above the ring edge part of the sealing ring, and the horizontal part is attached to the plane base part; the upper edge of the bowl body extends horizontally outwards to form an extension annular edge, and the outer wall of the annular boss extends downwards and is curled inwards to form a curled covered edge to cover the extension annular edge; the plane base body and the elastic sealing gasket are limited together to form an elastic sealing chamber; two ends of the sealing chamber spring are respectively abutted against the bottom and the horizontal part of the mounting bowl body;

the lever on-off structure comprises an air nozzle piece and a transmission lever; the air nozzle piece is in threaded connection with the air inlet end of the base body seat; the air nozzle piece is sequentially provided with an air nozzle part and a sliding pipe part along the axial direction, and the air outlet end of the air nozzle part is arranged inside the sliding pipe part; the air faucet part is provided with an air outlet end, and the air outlet end is connected with the air inlet of the air faucet part; comprises an upper floating part and a lower floating part which provide power for the rotation of a transmission lever; the transmission lever is rotatably arranged in the air channel; the upper floating piece and the lower floating piece are arranged on the horizontal part and are connected with the other end of the transmission lever;

the overcurrent circuit breaking device comprises a rotary connecting seat, an elastic retainer ring and a fixed connecting pipe body, wherein the fixed connecting pipe body is arranged at the air outlet end of the base body seat, the rotary connecting seat is sequentially provided with a connector part, a base part and a pin joint pipe part along the axial direction, and the pin joint pipe part is inserted into the fixed connecting pipe body and is rotatably connected with the fixed connecting pipe body; the fixed connection pipe body is arranged at the air outlet end of the base body seat; the outer wall of the pin joint pipe part is at least provided with three sealing ring grooves which are arranged at intervals, and each sealing ring groove is provided with a rubber sealing ring; the end, far away from the base part, of the pin-joint pipe part is provided with an annular clamping groove, and the elastic clamping ring is clamped in the annular clamping groove and abuts against the end face of one end of the fixed connection pipe body to limit the degree of freedom of axial movement of the rotary connection seat;

the overcurrent circuit-breaking device also comprises a floating ball, a ball chamber, an elastic restoring piece and a buffer chamber, wherein the ball chamber is provided with an air inlet and an air outlet, the air inlet and the air outlet are communicated with a main channel, the main channel is communicated with an air channel, and the caliber of the air outlet is smaller than the diameter of the floating ball; the slow storage chamber is arranged below the ball chamber, and the ball chamber and the slow storage chamber are both arranged on the base part; the floating ball is movably arranged in the ball chamber, and the diameter of the floating ball is larger than the caliber of the buffer chamber; one end of the elastic restoring piece is arranged on the base part, and the other end of the elastic restoring piece presses the floating ball at the opening end of the slow storage chamber; the open end of slow storage chamber is provided with two at least breachs, and the slow storage chamber switches on through breach and ball room.

Furthermore, the elastic sealing chamber structure further comprises an adjusting cock, an internal thread hole is formed in the middle of the mounting bowl body, the adjusting cock is connected to the internal thread hole in a threaded mode, and two ends of the sealing chamber spring abut against the horizontal portion and the adjusting cock.

Furthermore, the elastic sealing chamber structure also comprises a top disc and a nut, wherein a clamping ring part used for clamping a sealing chamber spring is arranged in the middle of the top disc, a disc part is arranged at the top end of the upper floating part and the lower floating part, a penetrating hole is formed in the middle of the disc part in an upward extending mode, and the other end of the transmission lever penetrates through the penetrating hole; the middle part of the disc part extends downwards to form a stud part, through holes are formed in the middle parts of the top disc and the horizontal part, the stud part penetrates through the through holes, and the top disc is tightly fixed to the horizontal part through nuts; and two ends of the sealing chamber spring are respectively abutted against the adjusting cock and the top disc.

Furthermore, the diameter of the top plate is smaller than the diameter of the horizontal part by 1.5 times of the thickness of the horizontal part, and the included angle between the extending direction of the conical surface deformation part and the vertical direction is 25-65 degrees.

Furthermore, the through-closing sliding plug is provided with a main body pipe and a hook end, the hook end is arranged at one end of the main body pipe and is connected with the transmission lever, and a supporting fin is arranged on the outer wall of the main body pipe and is arranged on the inner wall of the sliding pipe portion in a sliding mode. The transmission lever is provided with a vertical part, an inclined part and a connecting part, and the top end of the vertical part is connected with the bottom end of the inclined part through the inclined part; the top end of the vertical part is pivoted with the base body, and the vertical part is inserted into the hook end of the through-closing sliding plug; the inclined part is inserted in the upper floating part and the lower floating part.

Furthermore, the gaps are four, and the four gaps are arranged at the opening end of the buffer chamber at equal intervals along the circumferential direction.

Furthermore, the overcurrent circuit breaker device also comprises a recovery mechanism for resetting the floating ball, the recovery mechanism comprises a supporting body connected with the base part, a pressing part and a spring for recovering the position of the pressing part, the pressing part can be arranged on the supporting body in a reciprocating manner, two ends of the spring are respectively connected with the supporting body and the pressing part, and two ends of the elastic recovery part are respectively connected with the floating ball and the pressing part.

The utility model has the advantages that: when gas leakage occurs at the downstream, the gas flow passing through the ball chamber is suddenly increased, the floating ball blocks the gas outlet, so that the air pressure of the elastic sealing chamber is increased, the elastic sealing gasket is deformed to drive the upper floating piece and the lower floating piece to move downwards, and the upper floating piece and the lower floating piece push the gas outlet of the closed gas nozzle part of the open-close sliding plug through transmission of the transmission lever, so that the circuit is broken; the utility model discloses a relief valve of excessive automatic cutout, when the gas leakage takes place for the low reaches, can realize automatic cutout, avoid the too much leakage of gas, realize the safety protection function.

Drawings

Fig. 1 is a schematic partial sectional structural view of the elastic sealing chamber structure of the present invention.

Fig. 2 is a schematic view of the cross-sectional structure of the lever on-off structure of the present invention.

Fig. 3 is a schematic perspective view of the opening/closing sliding plug of the present invention.

Fig. 4 is a schematic view of a partial cross-sectional structure of the air faucet of the present invention.

Fig. 5 is a schematic view of the three-dimensional structure of the over-current circuit breaker of the present invention.

Fig. 6 is a schematic left-side view structure diagram of the overcurrent tripping device of the present invention.

Fig. 7 is a schematic view of the sectional axial view of the overcurrent tripping device of the present invention.

The reference numerals include:

1-elastic sealing chamber structure

11-base seat

111-plane base part 112-annular boss 113-curled edge covering

12-gas channel

13-elastic sealing gasket 131-horizontal part 132-sealing ring edge part

133-conical deformation part

14-seal chamber spring

15-mounting bowl body 151-extending ring edge

16-adjusting cock

17-upper and lower floating member 171-disc portion 172-stud portion

18-top plate

2-lever on-off structure

21-open/close sliding plug

211-main body tube 212-hook end 213-closed rubber plug 214-supporting fin

22-air nozzle member 221-air nozzle part 222-slide pipe part 223-inner hexagonal part

23-transmission lever 231-vertical part 232-inclined part 233-connecting part

3-overcurrent circuit breaker

31-rotating connecting seat

311-pivot pipe part 312-base part 313-nipple part 314-seal ring groove

315-ring clamping groove

32-main channel 33-floating ball

34-ball chamber 341-air inlet 342-air outlet

35-elastic restoring member

36-fixed connection pipe body

37-buffer storage 371-gap

38-recovery mechanism 381-support 382-pressing member

39-elastic collar.

Detailed Description

The present invention will be described in detail with reference to the accompanying drawings.

As shown in fig. 1, 2 and 5, in order to achieve the above object, the present invention provides an excessive automatic open-circuit safety valve, including an elastic sealing chamber structure 1, the elastic sealing chamber structure 1 includes a base seat 11, an elastic sealing gasket 13, a sealing chamber spring 14 and an installation bowl body 15, the base seat 11 is provided with a plane base body portion 111, the plane base body portion 111 is upwardly arched to form an air channel 12, and is characterized in that: the elastic sealing gasket 13 is provided with a horizontal part 131, a sealing ring annular edge part 132 and a conical surface deformation part 133 connecting the sealing ring annular edge part 132 and the horizontal part 131; the horizontal portion 131 and the seal ring edge portion 132 are not on the same horizontal plane; the outer edge of the planar base portion 111 extends downward to form an annular boss 112, and the annular boss 112 is recessed inward to form a ring groove; the sealing ring annular edge part 132 is arranged in the annular groove, the elastic sealing gasket 13 is arranged with the horizontal part 131 above the sealing ring annular edge part 132, and the horizontal part 131 is attached to the plane base part 111; the upper edge of the mounting bowl body 15 extends horizontally outwards to form an extending annular edge 151, the outer wall of the annular boss 112 extends downwards and is curled inwards to form a curled edge 113 to cover the extending annular edge 151; the plane base part 111 and the elastic sealing gasket 13 jointly limit and form an elastic sealing chamber; both ends of the seal chamber spring 14 are respectively abutted against the bottom and the horizontal portion 131 of the mounting bowl body 15. The annular groove is embedded by the annular edge part 132 of the sealing ring, and the extension annular edge 151 is coated by the curled covered edge 113, so that the elastic sealing chamber has good sealing performance, and meanwhile, when the pressure in the air channel 12 changes to reach a preset value, the conical surface deformation part 133 can be suddenly deformed to enable the horizontal part 131 to move downwards at a higher speed, so that a power source can be provided for the downward movement of the upper and lower floating parts 17; the predetermined value at which the pressure is changed to the predetermined value can be set according to the elastic coefficient of the tapered surface deformation portion 133.

The utility model discloses a safety valve with automatic excessive circuit breaking, which comprises a lever on-off structure 2 arranged in an air channel 12, wherein the lever on-off structure 2 comprises an air nozzle piece 22 and a transmission lever 23; the air nozzle piece 22 is in threaded connection with the air inlet end of the base seat 11; the air nozzle piece 22 is sequentially provided with an air nozzle part 221, a sliding pipe part 222 and an inner hexagonal part 223 along the axial direction, and the air outlet end of the air nozzle part 221 is arranged inside the sliding pipe part 222; the air outlet device further comprises a through-closing sliding plug 21 for closing the air outlet end of the air outlet part 221, the through-closing sliding plug 21 is arranged on the sliding pipe part 222 in a sliding mode, one end of the through-closing sliding plug 21 is connected with one end of the transmission lever 23, and the other end of the through-closing sliding plug 21 is arranged on one side of the air outlet end of the air outlet part 221; comprises an upper floating member 17 and a lower floating member 17 for providing power for the rotation of the transmission lever 23; the transmission lever 23 is rotatably arranged inside the air passage 12; the upper and lower float 17 is provided at the horizontal portion 131 and connected to the other end of the transmission lever 23. The utility model discloses a relief valve lever break-make structure 2, the power that usable transmission lever 23 provided upper and lower float 17 is enlarged to realize promoting logical smooth stopper 21 break-make gas passage 12, interior hexagonal portion 223 is convenient for install.

The utility model discloses a relief valve of excessive automatic circuit-breaking, still include overcurrent circuit-breaking device 3, overcurrent circuit-breaking device 3 includes swivelling joint seat 31, elasticity rand 39 and fixed connection body 36, and fixed connection body 36 is installed in the end of giving vent to anger of base member seat 11, and swivelling joint seat 31 has set gradually connector portion 313, base portion 312 and pivot tube portion 311 along the axial, and pivot tube portion 311 inserts fixed connection body 36 and fixed connection body 36 rotatable coupling; the fixed connection pipe body 36 is arranged at the air outlet end of the base body seat 11; the outer wall of the pivot pipe portion 311 is provided with at least three sealing ring grooves 314 arranged at intervals, and each sealing ring groove 314 is provided with a rubber sealing ring; the end of the pivoting pipe part 311, which is far away from the base part 312, of the pivoting pipe part 311 is provided with an annular clamping groove 315, and the elastic clamping ring 39 is clamped in the annular clamping groove 315 and abuts against the end surface of one end of the fixed connecting pipe body 36 to limit the freedom degree of the axial movement of the rotary connecting seat 31; the rotary connecting base 31 can rotate freely relative to the fixed connecting pipe body 36 under the condition of tight connection with the fixed connecting pipe body 36 so as to meet the connection requirements of various relative angles.

The utility model discloses a relief valve of excessive automatic cutout, overcurrent circuit breaker 3 still includes floater 33, ball room 34, elasticity restore 35, buffer chamber 37, ball room 34 is provided with air inlet 341 and gas outlet 342, and air inlet 341, gas outlet 342 switch on with main entrance 32, and main entrance 32 switches on with gas channel 12, and the bore of gas outlet 342 is less than the diameter of floater 33; the slow storage chamber 37 is arranged below the ball chamber 34, and both the ball chamber 34 and the slow storage chamber 37 are arranged on the base part 312; the floating ball 33 is movably arranged in the ball chamber 34, and the diameter of the floating ball 33 is larger than the caliber of the buffer chamber 37; one end of the elastic restoring member 35 is disposed at the base portion 312, and the other end of the elastic restoring member 35 presses the float 33 against the opening end of the buffer chamber 37; the opening end of the slow storage chamber 37 is provided with at least two notches 371, and the slow storage chamber 37 is communicated with the ball chamber 34 through the notches 371. Normally, the floating ball 33 is pressed on the opening end of the buffer chamber 37, the gas enters the ball chamber 34 through the gas inlet 341 and is discharged from the gas outlet 342, when gas leakage occurs at the downstream and the gas flow passing through the ball chamber 34 is suddenly increased, part of the gas enters the buffer chamber 37 through the notch 371, the acting force of the air pressure in the buffer chamber 37 on the floating ball 33 overcomes the acting force of the elastic restoring piece 35 on the floating ball 33, so that the floating ball 33 floats upwards, the floating ball 33 is pressed on the air outlet 342 by the gas under the action of the flowing of the air inlet 341 so as to block the air outlet 342 to realize the open circuit, the air pressure in the elastic sealing chamber is increased, and when the air pressure in the elastic sealing chamber reaches a certain value, the conical surface deformation part 133 will be suddenly deformed, the horizontal part 131 drives the upper and lower floating parts 17 to move downwards, and pushes the open-close sliding plug 21 to block the air outlet end of the air outlet part 221 to realize open circuit, so that further leakage of downstream fuel gas is avoided.

The utility model discloses an excessive relief valve that opens circuit automatically, elasticity seal chamber structure 1 still includes adjusting cock 16, the middle part of the installation bowl body 15 is provided with the internal thread hole, and adjusting cock 16 threaded connection is in the internal thread hole, and seal chamber spring 14's both ends butt is in horizontal part 131 and adjusting cock 16. The utility model discloses a relief valve of excessive automatic cutout, accessible adjusting cock 16 realize the compression to the not equidimension of seal chamber spring 14, realize adjusting the size that makes horizontal part 131 take place the pressure of deformation.

The utility model discloses a relief valve of excessive automatic circuit breaking, elasticity seal chamber structure 1 still includes top dish 18 and nut, and top dish 18 middle part is provided with the clamping ring portion that is used for the card to hold seal chamber spring 14, the top of upper and lower float 17 is provided with disc portion 171, and the middle part of disc portion 171 extends upwards and is formed with the interlude hole, and the other end of transmission lever 23 alternates in the interlude hole; a stud part 172 extends downwards from the middle part of the disc part 171, through holes are formed in the middle parts of the top disc 18 and the horizontal part 131, the stud part 172 penetrates through the through holes, and the top disc 18 is tightly fixed on the horizontal part 131 through nuts; the two ends of the seal chamber spring 14 abut against the regulating cock 16 and the top plate 18, respectively. The utility model discloses an excessive automatic relief valve that opens circuit avoids seal chamber spring 14 to take place to remove the deformation that influences conical surface deformation portion 133.

The utility model discloses a relief valve of excessive automatic shut-off, when the gas leakage takes place at the low reaches, the gas flow through ball chamber 34 increases suddenly, and gas outlet 342 can be blockked up to floater 33 for the atmospheric pressure of elastic seal room rises, and floating piece 17 moves down about elastic seal gasket 13 takes place to warp and drives, and floating piece 17 promotes the venthole that leads to and close the closed gas mouth portion 221 of sliding plug 21 through the transmission of transmission lever 23 from top to bottom, realizes opening circuit.

The utility model discloses a relief valve of excessive automatic cutout, the value that the diameter of top dish 18 is less than horizontal part 131 diameter is 1.5 times of the thickness of horizontal part 131, the contained angle of conical surface deformation 133 extending direction and vertical direction is 25 ~ 65. The utility model discloses an excessive automatic relief valve that opens circuit, when atmospheric pressure in the elastic seal room has not reached preset atmospheric pressure, conical surface deformation portion 133 can remain stable and do not take place to warp, after reaching preset atmospheric pressure, conical surface deformation portion 133 side can take place the sudden change.

The utility model discloses a relief valve of excessive automatic cutout, lead to and close smooth stopper 21 and be provided with main part pipe 211, couple end 212 sets up in the one end of main part pipe 211 and is connected with transmission lever 23, and the outer wall of main part pipe 211 is provided with support fin 214, supports fin 214 and slides and set up in the inner wall of slide-tube portion 222. The transmission lever 23 is provided with a vertical portion 231, an inclined portion 232, and a connecting portion 233, and the top end of the vertical portion 231 and the bottom end of the inclined portion 232 are connected by the inclined portion 232; the top end of the vertical part 231 is pivoted to the base body, and the vertical part 231 is inserted into the hook end 212 of the through-closing sliding plug 21; the inclined portion 232 is inserted into the upper and lower floating members 17. The utility model discloses a relief valve that excessive automatic circuit break takes place to block up the back at the end of giving vent to anger of air channel 12, and the back is risen to the atmospheric pressure in the elastic seal room, can realize break-make air channel 12 under the effect of the external force that elastic seal gasket 13 takes place the inflation deformation. The other end of the main tube 211 is provided with a hermetic rubber stopper 231, which improves sealability.

The utility model discloses a relief valve of excessive automatic cutout, breach 371 is provided with four, and four breach 371 equidistant sets up in the open end of slow reservoir 37 along the circumferencial direction. The utility model relates to a safety valve capable of automatically breaking when in excess,

the utility model discloses a relief valve of excessive automatic cutout, overcurrent circuit breaker 3 still includes the mechanism 38 that resumes for reseing floater 33, resume mechanism 38 includes supporter 381, the press unit 382 be connected with base portion 312 and is used for resuming the spring of press unit 382 position, but press unit 382 reciprocating motion set up in supporter 381, the both ends of spring respectively with supporter 381, press unit 382 connection, elasticity resume 35 the both ends respectively with floater 33, press unit 382 connection. The utility model discloses a relief valve of excessive automatic cutout overflows circuit breaker 3 and takes place the back that opens circuit, and the accessible is pressed down press unit 382 and is made floater 33 reset and realize the route at the 37 open ends of slow storage chamber.

In conclusion, the present invention has the above-mentioned excellent characteristics, so that it can be used to enhance the effectiveness of the prior art and has practicability, and thus it is a product with practical value.

The above description is only for the preferred embodiment of the present invention, and for those skilled in the art, there are variations on the detailed description and the application scope according to the idea of the present invention, and the content of the description should not be construed as a limitation to the present invention.

Claims (7)

1. The utility model provides an excessive automatic safety valve that opens circuit, includes the elasticity seal chamber structure, the elasticity seal chamber structure includes the base member seat, elastic seal gasket, seal chamber spring and installation bowl body, the base member seat is provided with the plane base part, and the plane base part upwards arches and is formed with gas channel, its characterized in that: the elastic sealing gasket is provided with a horizontal part, a sealing ring edge part and a conical surface deformation part for connecting the sealing ring edge part and the horizontal part; the horizontal part and the sealing ring edge part are not on the same horizontal plane;

the outer edge of the plane base body part extends downwards to form an annular boss, and the annular boss is sunken inwards to form an annular groove; the sealing ring is characterized in that the ring edge part of the sealing ring is arranged in the ring groove, the elastic sealing gasket is arranged with a horizontal part above the ring edge part of the sealing ring, and the horizontal part is attached to the plane base part;

the upper edge of the bowl body extends horizontally outwards to form an extension annular edge, and the outer wall of the annular boss extends downwards and is curled inwards to form a curled covered edge to cover the extension annular edge;

the plane base body and the elastic sealing gasket are limited together to form an elastic sealing chamber;

two ends of the sealing chamber spring are respectively abutted against the bottom and the horizontal part of the mounting bowl body;

the lever on-off structure comprises an air nozzle piece and a transmission lever; the air nozzle piece is in threaded connection with the air inlet end of the base body seat; the air nozzle piece is sequentially provided with an air nozzle part and a sliding pipe part along the axial direction, and the air outlet end of the air nozzle part is arranged inside the sliding pipe part; the air faucet part is provided with an air outlet end, and the air outlet end is connected with the air inlet of the air faucet part;

comprises an upper floating part and a lower floating part which provide power for the rotation of a transmission lever; the transmission lever is rotatably arranged in the air channel; the upper floating piece and the lower floating piece are arranged on the horizontal part and are connected with the other end of the transmission lever;

the overcurrent circuit breaking device comprises a rotary connecting seat, an elastic retainer ring and a fixed connecting pipe body, wherein the fixed connecting pipe body is arranged at the air outlet end of the base body seat, the rotary connecting seat is sequentially provided with a connector part, a base part and a pin joint pipe part along the axial direction, and the pin joint pipe part is inserted into the fixed connecting pipe body and is rotatably connected with the fixed connecting pipe body; the outer wall of the pin joint pipe part is at least provided with three sealing ring grooves which are arranged at intervals, and each sealing ring groove is provided with a rubber sealing ring; the end, far away from the base part, of the pin-joint pipe part is provided with an annular clamping groove, and the elastic clamping ring is clamped in the annular clamping groove and abuts against the end face of one end of the fixed connection pipe body to limit the degree of freedom of axial movement of the rotary connection seat;

the overcurrent circuit-breaking device also comprises a floating ball, a ball chamber, an elastic restoring piece and a buffer chamber, wherein the ball chamber is provided with an air inlet and an air outlet, the air inlet and the air outlet are communicated with a main channel, the main channel is communicated with an air channel, and the caliber of the air outlet is smaller than the diameter of the floating ball; the ball chamber and the buffer chamber are both arranged on the base part; the floating ball is movably arranged in the ball chamber, and the diameter of the floating ball is larger than the caliber of the buffer chamber; one end of the elastic restoring piece is arranged on the base part, and the other end of the elastic restoring piece presses the floating ball at the opening end of the slow storage chamber; the open end of slow storage chamber is provided with two at least breachs, and the slow storage chamber switches on through breach and ball room.

2. The safety valve for automatic excessive disconnection according to claim 1, wherein: the elastic sealing chamber structure further comprises an adjusting cock, an internal thread hole is formed in the middle of the mounting bowl body, the adjusting cock is connected to the internal thread hole in a threaded mode, and two ends of the sealing chamber spring abut against the horizontal portion and the adjusting cock.

3. The safety valve for automatic excessive disconnection according to claim 2, wherein: the elastic sealing chamber structure also comprises a top disc and a nut, wherein a clamping ring part used for clamping a sealing chamber spring is arranged in the middle of the top disc, a disc part is arranged at the top end of the upper floating part and the lower floating part, a penetrating hole is formed in the middle of the disc part in an upward extending mode, and the other end of the transmission lever penetrates through the penetrating hole; the middle part of the disc part extends downwards to form a stud part, through holes are formed in the middle parts of the top disc and the horizontal part, the stud part penetrates through the through holes, and the top disc is tightly fixed to the horizontal part through nuts; and two ends of the sealing chamber spring are respectively abutted against the adjusting cock and the top disc.

4. The safety valve for automatic excessive disconnection according to claim 3, wherein: the diameter of the top disc is smaller than that of the horizontal part by 1.5 times of the thickness of the horizontal part, and the included angle between the extension direction of the conical surface deformation part and the vertical direction is 25-65 degrees.

5. The safety valve for automatic excessive disconnection according to claim 1, wherein: the opening and closing sliding plug is provided with a main body pipe and a hook end, the hook end is arranged at one end of the main body pipe and is connected with a transmission lever, a supporting fin is arranged on the outer wall of the main body pipe and is arranged on the inner wall of the sliding pipe part in a sliding mode, the transmission lever is provided with a vertical part, an inclined part and a connecting part, and the top end of the vertical part is connected with the bottom end of the inclined part through the inclined part; the top end of the vertical part is pivoted with the base body, and the vertical part is inserted into the hook end of the through-closing sliding plug; the inclined part is inserted in the upper floating part and the lower floating part.

6. The safety valve for automatic excessive disconnection according to claim 1, wherein: the breach is provided with four, and four breachs equidistant sets up in the open end of buffer storage room along the circumferencial direction.

7. The safety valve for automatic excessive disconnection according to claim 1, wherein: the overcurrent circuit breaker device also comprises a recovery mechanism for resetting the floating ball, the recovery mechanism comprises a supporting body connected with the base part, a pressing part and a spring for recovering the position of the pressing part, the pressing part can be arranged on the supporting body in a reciprocating way, two ends of the spring are respectively connected with the supporting body and the pressing part, and two ends of the elastic recovery part are respectively connected with the floating ball and the pressing part.

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