CN219734379U - Horizontal point spouts electric energy storage gas fire extinguishing container valve - Google Patents

Abstract

The utility model discloses a horizontal point spraying electricity-storage gas fire-extinguishing container valve, which comprises a valve body, a valve core, a valve cover and a pilot valve, wherein the valve body is internally provided with a cavity; when the pilot valve is opened, the valve core moves rightwards due to the fact that the pressure in the air outlet cavity is higher than that in the air outlet cavity due to the fact that the pressure in the air outlet cavity is lower than that in the air outlet cavity, the piston is inserted into the air storage cavity, the air inlet hole on the sealing ejector rod also enters the air storage cavity, so that air in the air storage cavity can enter the air flow channel through the air inlet hole, and then enters the air outlet cavity from the air outlet; the valve can be opened, the pilot valve can be opened and closed, and the valve can be closed, so that the problem that the valve can not be closed and the point injection can not be realized when the conventional container valve is used is solved.

Description

Horizontal point spouts electric energy storage gas fire extinguishing container valve

Technical Field

The utility model relates to the technical field of fire-fighting equipment, in particular to a horizontal point-spraying electricity-storage gas fire-extinguishing container valve.

Background

The existing fire extinguishing containers are various, the main stream is a fire extinguishing container filled with gas, the gas filled into the fire extinguishing container is mainly heptafluoropropane or nitrogen, a container valve is usually arranged at a bottle mouth of the fire extinguishing container to realize the sealing of the fire extinguishing container, and then the opening and the closing of the valve are realized by utilizing pressure difference.

Most of the prior container valves realize pressure difference by puncturing the diaphragm, when the container valves are used, the diaphragm is ruptured to enable gas in the bottle and the outside to form a channel, and when the container valves are used, the valve cannot be closed, so that the fire extinguishing container can only be continuously used and can not be used in a suspended mode, and when the ignition points are dispersed, the waste of fire extinguishing gas is caused.

The application number is: 201821097667.8 the utility model with publication number of CN208619783U discloses a valve with a head for preparing a pressure type heptafluoropropane bottle, which comprises a valve body, a valve cover, a piston assembly, a spring, a pressure cap, a discharge diaphragm and other structures, but the valve can not be closed when the valve is still used in the technology, so that the problem of point injection is realized.

Disclosure of Invention

Based on the above, the utility model provides a horizontal point-spraying electricity-storage gas fire-extinguishing container valve, which is used for realizing the opening of a pilot valve, the opening of the valve, the closing of the pilot valve and the closing of the valve through the matching arrangement of the internal structures of the pilot valve and the valve, and solving the problems that the valve cannot be closed and the point-spraying cannot be realized when the conventional container valve is used.

The technical scheme of the utility model is as follows:

the valve core is arranged in the valve body and is in sliding fit with the valve body, the cavity in the valve body is divided into an air inlet cavity at the lower end, an air outlet cavity at the right side of the upper end and an air outlet cavity at the left side of the upper end, the valve cover is arranged at the right side of the valve body, an air exhaust flow passage and a buffer cavity are formed in the valve cover, one end of the air exhaust flow passage is communicated with the air exhaust cavity, the other end of the air exhaust flow passage is communicated with the buffer cavity, and the pilot valve is in sealing connection with the other end of the buffer cavity;

the valve core is provided with a mounting groove and an air storage cavity, a communication flow passage used for communicating the mounting groove with the air storage cavity is arranged between the mounting groove and the air storage cavity, the valve core is also provided with an air inlet flow passage used for communicating the air storage cavity with the air inlet cavity, a damping wire is arranged in the air inlet flow passage, a spring is arranged in the mounting groove, one side of the spring is connected with the mounting groove, and the other side of the spring is connected with the valve cover;

still be equipped with sealed ejector pin between valve gap and the case, the spring housing is established sealed ejector pin outside, sealed ejector pin one end with valve gap connection, the other end are equipped with the piston, the piston inserts the intercommunication runner and with intercommunication runner sliding fit, be equipped with gas runner, the inlet port that is used for admitting air and the venthole that is used for giving vent to anger in the sealed ejector pin, inlet port and venthole all with gas runner intercommunication.

Preferably, the left side of the valve core is provided with a limiting block for limiting the valve core to move leftwards, a lap joint matched with the limiting block is arranged in the valve body, a first sealing ring is arranged at the contact part of the limiting block and the lap joint, and a locking nut for fixing the first sealing ring is further arranged on the left side of the valve core.

Preferably, a second sealing ring is arranged in the communication flow passage in the valve core.

Preferably, a third sealing ring is arranged on the right side of the valve core, and the third sealing ring is in contact with the valve body.

Preferably, a fourth sealing ring and a fifth sealing ring for sealing the valve body are arranged at the joint of the valve cover and the valve body.

Preferably, a cap is arranged on the left side of the valve body, and the cap is in threaded connection with the valve body.

Preferably, the cap is provided with a first insertion groove, a first insertion pin is inserted into the first insertion groove, the valve body is provided with a second insertion groove, a second insertion pin is inserted into the second insertion groove, and a connecting chain is arranged between the first insertion pin and the second insertion pin.

Preferably, the bottom of the valve body is provided with a threaded connection part for connecting a fire extinguishing container and a siphon connection part for connecting a siphon, the siphon connection part is arranged in the air inlet cavity, and the siphon connection part can be connected with the siphon.

Preferably, the valve body is provided with a first interface, the first interface is communicated with the air inlet cavity, a pressure relief device is connected to the first interface in a sealing mode, the pressure relief device comprises a locking plug and a safety compression ring, a pressure relief runner is arranged on the locking plug, the pressure relief runner is communicated with the first interface, a pressure relief hole communicated with the pressure relief runner is arranged on the locking plug, one end of the locking plug is in threaded connection with the first interface, and the safety compression ring is matched with the front end of the pressure relief runner of the locking plug.

Preferably, the valve body is further provided with a second interface, the second interface is communicated with the air inlet cavity, the second interface is connected with an installation seat, the installation seat comprises a fastening bolt and a protective sleeve, an air channel is arranged in the fastening bolt, the air channel is communicated with the air inlet cavity, one end of the fastening bolt is inserted into the second interface and is connected through the protective sleeve in a matched mode, an O-shaped sealing ring is arranged at the joint, and a pressure gauge transfer interface and an air supplementing port are arranged at the other end of the fastening bolt.

Compared with the prior art, the utility model has the beneficial effects that:

when the pilot valve is closed, the valve core is tightly attached to the left side of the valve body under the support of the force generated by the spring because the pressure in the air outlet cavity and the pressure in the air outlet cavity are the same, the valve is in a closed state, the piston is in a communication flow passage and is used for blocking the communication flow passage, and an air inlet hole on the sealing ejector rod is positioned at one side of the mounting groove; when the pilot valve is opened, the valve core moves rightwards due to the fact that the pressure in the air outlet cavity is higher than that in the air outlet cavity due to the fact that the pressure in the air outlet cavity is lower than that in the air outlet cavity, the valve is in an open state, the piston is inserted into the air storage cavity, the air inlet hole on the sealing ejector rod also enters the air storage cavity, so that air in the air storage cavity can enter the air flow channel through the air inlet hole, and then enters the air outlet cavity from the air outlet; when the pilot valve is closed, gas in the gas inlet cavity can enter the gas storage cavity through the gas inlet channel with the damping wire, gas in the gas storage cavity enters the gas flow channel through the gas inlet hole and then enters the gas exhaust cavity from the gas outlet, so that the gas outlet cavity is the same as the pressure in the gas exhaust cavity, the valve core can be clung to the left side of the valve body under the support of the force generated by the spring, the valve is restored to the closed state, the pilot valve is opened through the matched arrangement of the pilot valve and the internal structure of the valve, the valve is opened, the pilot valve is closed, and the valve is closed, so that the problem that the valve cannot be closed and the point injection cannot be realized when the conventional container valve is used is solved.

Drawings

FIG. 1 is a schematic cross-sectional view of a horizontal point-spraying energy-storage gas fire-extinguishing container valve according to an embodiment of the present utility model;

FIG. 2 is a schematic cross-sectional view of a portion of a horizontal point-spraying energy-storage gas fire-extinguishing container valve according to an embodiment of the present utility model;

FIG. 3 is a schematic view of the construction of the lap joint of FIG. 1 according to an embodiment of the present utility model;

reference numerals illustrate:

10-valve body, 11-lap joint, 100-intake chamber, 110-exhaust chamber, 120-exhaust chamber, 20-valve core, 200-mounting groove, 210-gas storage chamber, 220-communication flow passage, 221-second sealing ring, 222-third sealing ring, 230-intake flow passage, 240-damping wire, 250-spring, 260-stopper, 270-first sealing ring, 280-lock nut, 30-valve cover, 300-exhaust flow passage, 301-fourth sealing ring, 302-fifth sealing ring, 310-buffer chamber, 40-pilot valve, 50-seal ejector pin, 500-gas flow passage, 510-intake port, 520-exhaust port, 51-piston, 60-cap, 600-first insert groove, 610-first plug pin, 611-sealing washer, 620-second insert groove, 630-second plug pin, 640-connecting chain, 70-threaded connection, 71-siphon connection, 80-first interface, 800-pressure relief device, 810-locking plug, 820-safety press ring, 830-pressure relief runner, 840-pressure relief hole, 90-second interface, 900-mount, 910-fastening bolt, 920-protective sleeve, 930-gas channel, 940-O-ring seal, 950-pressure gauge conversion interface, 960-air compensating port, 970-sealing plug.

Detailed Description

Embodiments of the present utility model will be described in detail below with reference to the accompanying drawings.

Examples:

as shown in fig. 1 to 3, the embodiment discloses a horizontal point spraying electricity-storing gas fire-extinguishing container valve, which comprises a valve body 10 with a cavity therein, a valve core 20, a valve cover 30 and a pilot valve 40, wherein the valve core 20 is arranged inside the valve body 10 and is in sliding fit with the valve body 10, the cavity inside the valve body 10 is divided into an air inlet cavity 100 at the lower end, an air outlet cavity 110 at the right side of the upper end and an air outlet cavity 120 at the left side of the upper end, the valve cover 30 is arranged at the right side of the valve body 10, an air outlet flow passage 300 and a buffer cavity 310 are arranged on the valve cover 30, one end of the air outlet flow passage 300 is communicated with the air outlet cavity 110, the other end of the air outlet flow passage 300 is communicated with the buffer cavity 310, and the pilot valve 40 is in sealing connection with the other end of the buffer cavity 310;

the valve core 20 is provided with a mounting groove 200 and a gas storage cavity 210, a communication flow passage 220 for communicating the mounting groove 200 and the gas storage cavity 210 is arranged between the mounting groove 200 and the gas storage cavity 210, the valve core 20 is also provided with an air inlet flow passage 230 for communicating the gas storage cavity 210 and the air inlet cavity 100, a damping wire 240 is arranged in the air inlet flow passage 230, a spring 250 is arranged in the mounting groove 200, one side of the spring 250 is connected with the mounting groove 200, and the other side is connected with the valve cover 30;

the valve cover 30 and the valve core 20 are also provided with a sealing ejector rod 50, the spring 250 is sleeved on the outer side of the sealing ejector rod 50, one end of the sealing ejector rod 50 is connected with the valve cover 30, the other end of the sealing ejector rod is provided with a piston 51, the piston 51 is inserted into the communication flow passage 220 and is in sliding fit with the communication flow passage 220, a gas flow passage 500, an air inlet hole 510 for air inlet and an air outlet hole 520 for air outlet are arranged in the sealing ejector rod 50, and the air inlet hole 510 and the air outlet hole 520 are both communicated with the gas flow passage 500.

The pilot valve 40 is an electric pilot valve 40, and a battery for supplying power to the pilot valve 40 is arranged on the valve body in a matching way.

When the pilot valve 40 is closed, the valve core 20 is tightly attached to the left side of the valve body 10 under the support of the force generated by the spring 250 because the pressure in the air outlet cavity 120 and the pressure in the air outlet cavity 110 are the same, the valve is in a closed state, the piston 51 is in the communication flow passage 220 and is used for blocking the communication flow passage 220, and the air inlet 510 on the sealing ejector rod 50 is positioned on one side of the mounting groove 200; when the pilot valve 40 is opened, the valve core 20 moves rightwards due to the fact that the pressure in the air outlet cavity 120 is higher than that in the air outlet cavity 110 due to the fact that the pressure in the air outlet cavity 110 is lost, the valve is in an open state, the piston 51 is inserted into the air storage cavity 210, the air inlet 510 on the seal ejector 50 also enters the air storage cavity 210, so that air in the air storage cavity 210 can enter the air flow channel 500 through the air inlet 510, and then enters the air outlet cavity 110 from the air outlet; when the pilot valve 40 is closed, gas in the gas inlet cavity 100 can enter the gas storage cavity 210 through the gas inlet channel 230 with the damping wire 240, gas in the gas storage cavity 210 enters the gas channel 500 through the gas inlet hole 510 and then enters the gas outlet cavity 110 from the gas outlet, so that the pressure in the gas outlet cavity 120 is the same as that in the gas outlet cavity 110, the valve core 20 can be tightly attached to the left side of the valve body 10 under the support of the force generated by the spring 250, the valve is restored to the closed state, the opening of the pilot valve 40 and the valve opening and the closing of the pilot valve 40 are realized through the matched arrangement of the pilot valve 40 and the valve internal structure, and the valve closing solves the problems that the valve cannot be closed and the point injection cannot be realized when the conventional container valve is used.

In order to achieve better sealing performance of the valve, it is further preferable that a stopper 260 for restricting the left movement of the valve core 20 is disposed on the left side of the valve core 20, a lap joint 11 matched with the stopper 260 is disposed in the valve body 10, a first sealing ring 270 is disposed at a contact position between the stopper 260 and the lap joint 11, and a locking nut 280 for fixing the first sealing ring 270 is disposed on the left side of the valve core 20.

When in use, the limiting block 260 and the first sealing ring 270 are arranged, so that the valve core 20 is tightly attached to the valve body 10 under the action of the pressure and the spring 250, and better sealing performance of the valve is realized.

In order to better seal between the gas storage chamber 210 and the mounting groove 200, it is further preferable that a second sealing ring 221 is provided in the communication flow passage 220 in the valve cartridge 20 on the basis of the above-described embodiment.

In order to provide the valve with better tightness, it is further preferable that the right side of the valve core 20 is provided with a third sealing ring 222, and the third sealing ring 222 is in contact with the valve body 10; the joint of the valve cover 30 and the valve body 10 is provided with a fourth sealing ring 301 and a fifth sealing ring 302 for sealing the valve body 10.

In order to provide better sealing performance for the valve and facilitate the accommodation of the cap 60, it is further preferable that the cap 60 is provided on the left side of the valve body 10, and the cap 60 is screwed with the valve body 10; the cap 60 is provided with a first insertion groove 600, a first insertion pin 610 is inserted into the first insertion groove 600, the valve body 10 is provided with a second insertion groove 620, a second insertion pin 630 is inserted into the second insertion groove 620, and a connecting chain 640 is arranged between the first insertion pin 610 and the second insertion pin 630.

When in use, after the cap 60 is taken down, the cap 60 can be hung on the valve body 10 without being separately stored, and meanwhile, whether the tightness of the valve is good can be observed by taking down the first plug pin 610.

In order to make the valve and the fire extinguishing container more convenient to be assembled and disassembled, it is further preferable that a threaded connection 70 for connecting the fire extinguishing container and a siphon connection 71 for connecting a siphon are provided at the bottom of the valve body 10, the siphon connection 71 is disposed in the air inlet chamber 100, and the siphon connection 71 can be connected with a siphon.

In use, the siphon tube can be connected to the siphon tube connection 71, then placed into the fire extinguishing container, and then screwed to the mouth of the fire extinguishing container through the threaded connection 70, thereby completing the installation.

In order to reduce the possibility of explosion of the fire extinguishing container caused by the rise of the air pressure in the fire extinguishing container bottle, it is further preferred that the valve body 10 is provided with a first interface 80, the first interface 80 is communicated with the air inlet cavity 100, the first interface 80 is connected with a pressure relief device 800 in a sealing manner, the pressure relief device 800 comprises a locking plug 810 and a safety compression ring 820, the locking plug 810 is provided with a pressure relief runner 830, the pressure relief runner 830 is communicated with the first interface 80, the locking plug 810 is provided with a pressure relief hole 840 communicated with the pressure relief runner 830, one end of the locking plug 810 is in threaded connection with the first interface 80, and the safety compression ring 820 is matched with the front end of the pressure relief runner 830 of the locking plug 810.

In use, when the pressure in the fire extinguishing container bottle rises to the explosion critical pressure, the safety compression ring 820 is broken, and the gas in the bottle can flow to the outside through the pressure release flow passage 830 and the pressure release hole 840, so that the possibility of explosion of the fire extinguishing container is reduced.

For better checking the air pressure in the fire extinguishing container bottle and supplementing the air in the bottle, it is further preferable that a second interface 90 is further provided on the valve body 10, the second interface 90 is communicated with the air inlet cavity 100, the second interface 90 is connected with a mounting seat 900, the mounting seat 900 includes a fastening bolt 910 and a protective sleeve 920, an air channel 930 is provided in the fastening bolt 910, the air channel 930 is communicated with the air inlet cavity 100, one end of the fastening bolt 910 is inserted into the second interface 90 and is connected in a matched manner through the protective sleeve 920, an O-shaped sealing ring 940 is provided at the connection position, a pressure gauge converting interface 950 and an air supplementing port 960 are provided at the other end of the fastening bolt 910, and the air supplementing port 960 is connected with a sealing plug 970 in a sealing manner.

When in use, the pressure gauge can be connected with the pressure gauge through the pressure gauge adapter 950 to directly observe the air pressure in the bottle of the fire extinguishing container, and when the air supplementing is needed, the air supplementing port 960 is connected with air supplementing equipment to supplement the air in the bottle of the fire extinguishing container.

In the above embodiment, the sealing washer 611 is provided on the connecting portion of the cap 60 and the first plug pin 610, so that the valve has better sealing performance and the shelf life of the fire extinguishing container is prolonged.

In the above embodiment, the damping wire 240 is made of stainless steel wire, so that the repeated service life of the valve can be effectively prolonged.

The working principle of the utility model is as follows:

when the pilot valve 40 is closed, the valve core 20 is tightly attached to the left side of the valve body 10 under the support of the force generated by the spring 250 because the pressure in the air outlet cavity 120 and the pressure in the air outlet cavity 110 are the same, the valve is in a closed state, the piston 51 is in the communication flow passage 220 and is used for blocking the communication flow passage 220, and the air inlet 510 on the sealing ejector rod 50 is positioned on one side of the mounting groove 200; when the pilot valve 40 is opened, the valve core 20 moves rightwards due to the fact that the pressure in the air outlet cavity 120 is higher than that in the air outlet cavity 110 due to the fact that the pressure in the air outlet cavity 110 is lost, the valve is in an open state, the piston 51 is inserted into the air storage cavity 210, the air inlet 510 on the seal ejector 50 also enters the air storage cavity 210, so that air in the air storage cavity 210 can enter the air flow channel 500 through the air inlet 510, and then enters the air outlet cavity 110 from the air outlet; when the pilot valve 40 is closed, the gas in the gas inlet chamber 100 enters the gas storage chamber 210 through the gas inlet channel 230 with the damping wire 240, the gas in the gas storage chamber 210 enters the gas channel 500 through the gas inlet 510, and then enters the gas outlet chamber 110 from the gas outlet, so that the pressure of the gas outlet chamber 120 is the same as that in the gas outlet chamber 110, the valve core 20 clings to the left side of the valve body 10 under the support of the force generated by the spring 250, and the valve is restored to the closed state.

The foregoing examples merely illustrate specific embodiments of the utility model, which are described in greater detail and are not to be construed as limiting the scope of the utility model. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the utility model, which are all within the scope of the utility model.

Claims (10)

1. The utility model provides a horizontal point spouts electric energy storage gas fire extinguishing container valve which characterized in that, including inside valve body (10) that has the cavity, case (20), valve gap (30) and pilot valve (40), case (20) set up inside valve body (10) and with valve body (10) sliding fit, the inside cavity of valve body (10) divide into inlet chamber (100) of lower extreme, exhaust chamber (110) on upper end right side and upper end left side vent chamber (120), valve gap (30) set up in valve body (10) right side, open on valve gap (30) has exhaust runner (300) and buffer chamber (310), exhaust runner (300) one end with exhaust chamber (110) intercommunication, the other end with buffer chamber (310) intercommunication, pilot valve (40) with buffer chamber (310) other end sealing connection;

the valve core (20) is provided with a mounting groove (200) and a gas storage cavity (210), a communication flow passage (220) used for communicating the mounting groove (200) and the gas storage cavity (210) is arranged between the mounting groove (200) and the gas storage cavity (210), the valve core (20) is also provided with an air inlet flow passage (230) used for communicating the gas storage cavity (210) and the air inlet cavity (100), a damping wire (240) is arranged in the air inlet flow passage (230), a spring (250) is arranged in the mounting groove (200), one side of the spring (250) is connected with the mounting groove (200), and the other side of the spring is connected with the valve cover (30);

still be equipped with sealed ejector pin (50) between valve gap (30) and case (20), spring (250) cover is established sealed ejector pin (50) outside, sealed ejector pin (50) one end with valve gap (30) are connected, and the other end is equipped with piston (51), piston (51) insert intercommunication runner (220) and with intercommunication runner (220) sliding fit, be equipped with gas runner (500), be used for inlet port (510) and be used for giving vent to anger venthole (520) of admitting air in sealed ejector pin (50), inlet port (510) and venthole (520) all with gas runner (500) intercommunication.

2. The horizontal type point spraying electricity energy storage gas fire extinguishing container valve according to claim 1, wherein a limiting block (260) for limiting leftward movement of the valve core (20) is arranged on the left side of the valve core (20), a lap joint (11) matched with the limiting block (260) is arranged in the valve body (10), a first sealing ring (270) is arranged at a contact position of the limiting block (260) and the lap joint (11), and a locking nut (280) for fixing the first sealing ring (270) is further arranged on the left side of the valve core (20).

3. The horizontal spot-spraying energy-storage gas fire-extinguishing container valve according to claim 1 or 2, characterized in that a second sealing ring (221) is arranged in the communication flow passage (220) in the valve core (20).

4. A horizontal spot-spraying electricity-storage gas fire-extinguishing container valve according to claim 3, characterized in that the right side of the valve core (20) is provided with a third sealing ring (222), the third sealing ring (222) is in contact with the valve body (10).

5. A horizontal spot-spraying electricity-storage gas fire-extinguishing container valve according to claim 3, characterized in that the junction of the valve cover (30) and the valve body (10) is provided with a fourth sealing ring (301) and a fifth sealing ring (302) for sealing the valve body (10).

6. A horizontal spot-spraying electricity-storage gas fire-extinguishing container valve according to claim 3, characterized in that a cap (60) is arranged on the left side of the valve body (10), and the cap (60) is in threaded connection with the valve body (10).

7. The horizontal type point spraying electricity energy storage gas fire extinguishing container valve according to claim 6, wherein a first insertion groove (600) is formed in the cap (60), a first insertion pin (610) is inserted into the first insertion groove (600), a second insertion groove (620) is formed in the valve body (10), a second insertion pin (630) is inserted into the second insertion groove (620), and a connecting chain (640) is arranged between the first insertion pin (610) and the second insertion pin (630).

8. The horizontal type point spraying electricity storage gas fire extinguishing container valve according to claim 7, wherein a threaded connection (70) for connecting a fire extinguishing container and a siphon connection (71) for connecting a siphon are arranged at the bottom of the valve body (10), the siphon connection (71) is arranged in the air inlet cavity (100), and the siphon connection (71) can be connected with the siphon.

9. The horizontal point spouts electricity energy storage gas fire extinguishing container valve according to claim 3, characterized in that, be equipped with first interface (80) on valve body (10), first interface (80) with inlet chamber (100) intercommunication, sealing connection has pressure release device (800) on first interface (80), pressure release device (800) include locking embolism (810) and safe clamping ring (820), it has pressure release runner (830) to open on locking embolism (810), pressure release runner (830) with first interface (80) intercommunication, open on locking embolism (810) with pressure release hole (840) of pressure release runner (830) intercommunication, locking embolism (810) one end with first interface (80) threaded connection, safe clamping ring (820) cooperation sets up pressure release runner (830) front end of locking embolism (810).

10. A horizontal spot-spraying electricity-storage gas fire-extinguishing container valve according to claim 3, characterized in that the valve body (10) is further provided with a second interface (90), the second interface (90) is communicated with the air inlet cavity (100), the second interface (90) is connected with a mounting seat (900), the mounting seat (900) comprises a fastening bolt (910) and a protective sleeve (920), a gas channel (930) is arranged in the fastening bolt (910), the gas channel (930) is communicated with the air inlet cavity (100), one end of the fastening bolt (910) is inserted into the second interface (90) and is connected in a matched manner through the protective sleeve (920), an O-shaped sealing ring (940) is arranged at the joint, and a pressure gauge rotating interface (950) and a gas supplementing port (960) are arranged at the other end of the fastening bolt (910).