CN220780835U

CN220780835U - Pneumatic high-pressure water gun structure

Info

Publication number: CN220780835U
Application number: CN202321974755.2U
Authority: CN
Inventors: 邓志健
Original assignee: Hangzhou Baoxie Electromechanical Technology Co ltd
Current assignee: Hangzhou Baoxie Electromechanical Technology Co ltd
Priority date: 2023-07-26
Filing date: 2023-07-26
Publication date: 2024-04-16
Anticipated expiration: 2033-07-26

Abstract

The utility model discloses a pneumatic high-pressure water gun structure, and aims to provide a pneumatic high-pressure water gun structure capable of controlling liquid water to flow through the change of air pressure. The water gun comprises a gun body and an air pump, wherein a water inlet and a water outlet are formed in the gun body, the front end of the water inlet runner is communicated with the water inlet, the rear end of the water inlet runner is communicated with the front end of the water outlet runner, the rear end of the water outlet runner is communicated with the water outlet, a water outlet pipe, an air ejector tube, a single chip microcomputer and a switch assembly are arranged on the air pump, the water outlet pipe and the air ejector tube are communicated with the water outlet runner, a valve I is arranged on the water outlet pipe, a valve II is arranged on the air ejector tube, the valve I, the valve II and the air pump are all electrically connected with the single chip microcomputer, and the single chip microcomputer is electrically connected with the switch assembly. The beneficial effects of the utility model are as follows: the purpose of controlling the flow of liquid water through the change of air pressure can be achieved; the circulation control of the water outlet pipe and the air jet pipe is facilitated; the valve core and the pressure relief hole are conveniently sealed.

Description

Pneumatic high-pressure water gun structure

Technical Field

The utility model relates to the technical field of water gun equipment, in particular to a pneumatic high-pressure water gun structure.

Background

The high-pressure water gun is a type of water gun, and a high-pressure cleaning machine is characterized in that a high-pressure plunger pump is enabled to generate high-pressure water through a power device to flush the surface of an object, dirt glass can be directly flushed away due to strong impulsive force of the high-pressure plunger pump, the purpose of cleaning the surface of the object is achieved, and the high-pressure water gun is one of the most scientific, economic and environment-friendly cleaning modes which are accepted in the world, so that the high-pressure water gun is widely used in real life. The selection of the power device of the existing high-pressure water gun directly influences the working effect of the water gun.

Chinese patent grant bulletin number: CN208244997U, authorized bulletin day 2018, 12 and 18, discloses a high-pressure water gun, comprising a gun body and a water pump connected with the gun body, wherein a water inlet flow channel and a water outlet flow channel are arranged in the gun body; one end of the water inlet flow passage penetrates through the outer side wall of the gun body, and the other end of the water inlet flow passage is communicated with the water inlet of the water pump; one end of the water outlet flow passage is connected with the water outlet of the water pump, the other end of the water outlet flow passage penetrates through the outer side wall of the gun body, and a one-way valve for allowing a water supply body to flow into the water pump through the water inlet flow passage is arranged in the water pump; a water inlet joint is arranged in the water inlet flow passage; a pressure relief hole is formed in the gun body, one end of the pressure relief hole is communicated with the water inlet flow passage, and the other end of the pressure relief hole is communicated with the water outlet flow passage; the pressure relief valve is characterized in that a valve core for plugging the pressure relief hole is connected in a sliding manner in the pressure relief hole, a pressure spring for propping the valve core against the inside of the pressure relief hole is sleeved on the valve core, one end of the pressure spring is connected with the valve core, and the other end of the pressure spring is connected with the water inlet joint. The technical scheme has the defects that the adopted power device uses the water pump, the water pump works to flush and use the water, but the impeller in the water pump rotates at a high speed, the liquid water rotates along with the blades, and the liquid water flies away from the impeller to be ejected outwards under the action of centrifugal force. The mechanical type liquid water pump drives the liquid water to be discharged outwards, so that solids in the liquid water can enter the water pump along with the flow of the liquid water, the solids can possibly strike the impeller, the impeller can be damaged, the water pump can be blocked, and the smooth work of the high-pressure water gun is influenced.

In summary, the structure for reducing the probability of the influence of the solids in the liquid water on the operation of the high-pressure water gun can be designed, so that the high-pressure water gun can operate smoothly in a stable and safe environment.

Disclosure of Invention

The utility model provides a pneumatic high-pressure water gun structure capable of controlling the flow of liquid water through the change of air pressure in order to overcome the defect of adopting mechanical drainage in the prior art.

In order to achieve the above purpose, the present utility model adopts the following technical scheme:

the utility model provides a pneumatic high-pressure water gun structure, includes rifle body and air pump, be equipped with water inlet, delivery port in the rifle body, intake runner and play water runner, the front end and the water inlet intercommunication of intake runner, the rear end and the front end intercommunication of play water runner of intake runner, the rear end and the delivery port intercommunication of play water runner, install outlet pipe, jet-propelled pipe, singlechip and switch module on the air pump, outlet pipe and jet-propelled pipe all communicate with play water runner, outlet pipe and jet-propelled pipe all arrange the lower extreme of intake runner in, the upper end of intake runner is arranged in to the delivery port, install valve one on the outlet pipe, install valve two on the jet-propelled pipe, valve one, valve two and air pump all are connected with the singlechip electricity, the singlechip is connected with switch module electricity.

The water inlet of the gun body is connected with external liquid water storage equipment, the gun body is internally provided with a water inlet flow channel and a water outlet flow channel, the front end of the water inlet flow channel is communicated with the water inlet, the rear end of the water inlet flow channel is communicated with the front end of the water outlet flow channel, the rear end of the water outlet flow channel is communicated with the water outlet, the air pump is provided with a water outlet, an air jet pipe, a singlechip and a switch assembly, the water outlet pipe and the air jet pipe are communicated with the water outlet flow channel, the water outlet pipe and the air jet pipe are arranged at the lower end of the water inlet flow channel, the water outlet is arranged at the upper end of the water inlet flow channel, the air outlet can be changed to the water outlet flow channel by controlling the air pump, the first valve, the second valve and the air pump are all electrically connected with the singlechip, the singlechip can be firstly communicated with the water outlet flow channel by controlling the valve through the switch assembly, and then the air pump is controlled to start the air suction operation by controlling the switch assembly, and gas in the water outlet pipe is sucked out through the water outlet pipe, so that the water inlet flows in a small direction towards the water inlet. Then, through the control of the switch assembly, the valve I on the water outlet pipe is closed, and the valve II on the air ejector is opened, so that the air pump starts to generate air, the air is discharged outwards towards the water outlet flow passage communicated with the air ejector through the air ejector, and under the pressure of air pressure, liquid water in the water outlet flow passage can flow downwards towards the water outlet until the water outlet flow passage is discharged, so that the work of the high-pressure water gun is developed. The control of the air pump can make the liquid water flow in the air pressure change, so that the purpose of controlling the flow of the liquid water through the air pressure change can be achieved.

Preferably, the filter screen is sleeved in the water outlet pipe and the air jet pipe, and the water outlet pipe and the air jet pipe are detachably connected with the outer edge of the filter screen. The design is through all suit filter screen in outlet pipe and jet, let outlet pipe and jet all make with the outward flange of filter screen and be connected, just can let the liquid water in the outlet channel, when flowing to outlet pipe or jet, under the filter effect of filter screen, the solid in the shutoff liquid water, the solid in the liquid water is led into outlet pipe or jet, that is, in the solid in the liquid water is led into the air pump not let, in order to avoid the air pump to receive the striking of the solid in the liquid water and produce the damage.

Preferably, the water inlet connector is arranged in the water inlet flow passage, a pressure relief hole is formed in the gun body, one end of the pressure relief hole is communicated with the water inlet flow passage, the other end of the pressure relief hole is communicated with the water outlet flow passage, a valve core is arranged in the pressure relief hole, the valve core is detachably connected with the gun body, a pressure spring is sleeved on the valve core, one end of the pressure spring is connected with the valve core, and the other end of the pressure spring is connected with the water inlet connector. The design is through setting up the pressure release hole in the rifle body, let the one end and the water inlet flow channel intercommunication of pressure release hole, the other end and the water outlet flow channel intercommunication of pressure release hole just can let the water outlet flow channel in the rifle body be by the solid when blockking up, the air pressure of air pump is strikeed down to the water outlet flow channel, apply pressure to the case in the pressure release hole, then the case just can be pressurized and remove towards the water inlet direction, the pressure spring of suit will be compressed on the case this moment, and will appear the clearance between case and the pressure release hole, liquid water in the water outlet flow channel will be through in the clearance flow channel water inlet flow channel, that is to say when the water outlet flow channel is blockked up by the solid, liquid water in the high-pressure squirt can constantly circulate in water inlet flow channel, water outlet flow channel and pressure release hole, with the load of effectual protection air pump is stable, and the rifle body also be difficult for bursting, safe and reliable.

Preferably, a guide rod is sleeved in the water inlet joint, one end of the guide rod is detachably connected with the water inlet joint, and the other end of the guide rod is connected with the valve core. The design can make the case when moving through the guide bar, inserts into the water inlet joint and removes, not only can make the case not take place the skew at the removal in-process, can restrict the direction of movement of case moreover, effective practicality.

Preferably, the valve core is provided with a limiting block, a first inclined plane and a second inclined plane are arranged in the pressure relief hole, the first inclined plane is arranged at the communication position of the pressure relief hole and the water outlet flow passage, the second inclined plane is arranged on the side wall of the limiting block, and the second inclined plane is matched with the first inclined plane. When the valve core is pressed inside the pressure relief hole through the pressure spring, the second inclined surface on the upper side wall of the limiting block is abutted against the first inclined surface in the pressure relief hole, and under the cooperation of the first inclined surface and the second inclined surface, the valve core is not easy to move transversely inside the pressure relief hole, so that liquid water in the water outlet flow channel is not easy to enter the water inlet flow channel through the pressure relief hole when the high-pressure water gun is normally used.

Preferably, the valve core is provided with a first baffle ring and a second baffle ring, a first annular groove is arranged between the first baffle ring and the limiting block, a first sealing ring is arranged in the first annular groove, a second annular groove is arranged between the second baffle ring and the first baffle ring, a second sealing ring is arranged in the second annular groove, and the outer edge of the first sealing ring and the outer edge of the second sealing ring are both contacted with the inner wall of the pressure relief hole. The design is through the first sealing washer on the case for liquid water in the water outlet flow path is difficult to enter into the water inlet flow path through the pressure release hole when normal use, and through the second sealing washer on the case, just when first sealing washer became invalid, still can seal case and pressure release hole, lets liquid water in the water outlet flow path of high-pressure water gun be difficult to enter into the water inlet flow path through the pressure release hole.

The beneficial effects of the utility model are as follows: the purpose of controlling the flow of liquid water through the change of air pressure can be achieved; the circulation control of the water outlet pipe and the air jet pipe is facilitated; the valve core and the pressure relief hole are conveniently sealed.

Drawings

FIG. 1 is a schematic view of a construction of the present utility model;

FIG. 2 is a schematic view of the structure of the air pump of the present utility model;

FIG. 3 is a schematic distribution diagram of the water inlet and outlet channels of the present utility model;

FIG. 4 is a schematic view of a gun body of the present utility model;

fig. 5 is a schematic cross-sectional view of a high pressure water gun of the present utility model.

In the figure: 1. gun body, 2, air pump, 3, water inlet channel, 4, water outlet channel, 5, water inlet joint, 6, pressure relief hole, 7, case, 8, compression spring, 9, guide bar, 10, first inclined plane, 11, stopper, 12, second inclined plane, 13, first baffle ring, 14, first ring channel, 15, first sealing washer, 16, second baffle ring, 17, second ring channel, 18, second sealing washer, 19, valve one, 20, valve two, 21, outlet pipe, 22, jet pipe, 23, switch assembly.

Detailed Description

The utility model is further described below with reference to the drawings and detailed description.

In the embodiment shown in fig. 1, fig. 2 and fig. 3, the pneumatic high-pressure water gun structure comprises a gun body 1 and an air pump 2, wherein a water inlet and a water outlet are formed in the gun body 1, a water inlet flow channel 3 and a water outlet flow channel 4 are formed in the gun body, the front end of the water inlet flow channel 3 is communicated with the water inlet, the rear end of the water inlet flow channel 3 is communicated with the front end of the water outlet flow channel 4, the rear end of the water outlet flow channel 4 is communicated with the water outlet, an outlet pipe 21, an air jet pipe 22, a singlechip and a switch assembly 23 are arranged on the air pump 2, the outlet pipe 21 and the air jet pipe 22 are communicated with the water outlet flow channel 4, the water outlet is formed in the lower end of the water inlet flow channel 3, the water outlet is formed in the upper end of the water inlet flow channel 3, a valve I19 is arranged on the outlet pipe 21, a valve II 20 is arranged on the air jet pipe 22, the valve I19, the valve II 20 and the air pump 2 are electrically connected with the singlechip, and the singlechip are electrically connected with the switch assembly 23.

As shown in fig. 2, the water outlet pipe 21 and the air spraying pipe 22 are respectively sleeved with a filter screen, and the water outlet pipe 21 and the air spraying pipe 22 are respectively detachably connected with the outer edge of the filter screen.

As shown in fig. 1, 4 and 5, a water inlet joint 5 is installed in a water inlet runner 3, a pressure relief hole 6 is arranged in a gun body 1, one end of the pressure relief hole 6 is communicated with the water inlet runner 3, the other end of the pressure relief hole 6 is communicated with a water outlet runner 4, a valve core 7 is installed in the pressure relief hole 6, the valve core 7 is detachably connected with the gun body 1, a pressure spring 8 is sleeved on the valve core 7, one end of the pressure spring 8 is connected with the valve core 7, and the other end of the pressure spring 8 is connected with the water inlet joint 5. The water inlet joint 5 is sleeved with a guide rod 9, one end of the guide rod 9 is detachably connected with the water inlet joint 5, and the other end of the guide rod 9 is connected with the valve core 7. The valve core 7 is provided with a limiting block 11, a first inclined plane 10 and a second inclined plane 12 are arranged in the pressure relief hole 6, the first inclined plane 10 is arranged at the communication position of the pressure relief hole 6 and the water outlet flow passage 4, the second inclined plane 12 is arranged on the side wall of the limiting block 11, and the second inclined plane 12 is matched with the first inclined plane 10. The valve core 7 is provided with a first baffle ring 13 and a second baffle ring 16, a first annular groove 14 is arranged between the first baffle ring 13 and the limiting block 11, a first sealing ring 15 is arranged in the first annular groove 14, a second annular groove 17 is arranged between the second baffle ring 16 and the first baffle ring 13, a second sealing ring 18 is arranged in the second annular groove 17, and the outer edge of the first sealing ring 15 and the outer edge of the second sealing ring 18 are both in contact with the inner wall of the pressure relief hole 6.

Firstly, the pneumatic high-pressure water gun is integrally checked to see whether the connection of all parts on the high-pressure water gun is stable and reliable, in particular to the positions of two pipes of a water outlet pipe 21 and an air spraying pipe 22 on an air pump 2, the installation of a valve I19 on the water outlet pipe 21 and the installation of a valve II 20 on the air spraying pipe 22.

Then the water inlet on the gun body 1 is communicated with an external liquid water storage device, the water storage device can be a water tank for storing liquid water, of course, the liquid water in the water tank needs to be primarily treated, so that the liquid water can not contain excessive impurities, especially pointed solid matters, and a screen can be sleeved at the water inlet, thereby reducing the probability that the impurities in the liquid water enter the water inlet channel 3 communicated with the water inlet through the water inlet. The gun body 1 is internally provided with a water outlet, a water inlet flow channel 3 and a water outlet flow channel 4, the front end of the water inlet flow channel 3 is communicated with the water inlet, the rear end of the water inlet flow channel is communicated with the front end of the water outlet flow channel 4, and the rear end of the water outlet flow channel 4 is communicated with the water outlet, so that liquid water entering from the water inlet can be discharged from the water outlet along the water inlet flow channel 3 and the water outlet flow channel 4. Of course, the air pump 2 is also installed on the gun body 1, the water outlet pipe 21, the air injection pipe 22, the singlechip and the switch assembly 23 are installed on the air pump 2, the water outlet pipe 21 and the air injection pipe 22 are both communicated with the water outlet flow channel 4, the water outlet pipe 21 and the air injection pipe 22 are both arranged at the lower end of the water inlet flow channel 3, and the water outlet is arranged at the upper end of the water inlet flow channel 3, so that liquid water entering at the water inlet can still flow towards the direction of the air pump 2 under the action of no external force.

Therefore, when the high-pressure water gun works, firstly, by controlling the switch assembly 23, the valve 9 arranged on the water outlet pipe 21 is opened, the air pump 2 electrically connected with the switch assembly 23 can perform air suction work, liquid water entering at the water inlet is sucked into the water outlet flow passage 4 through the water inlet flow passage 3 and then can be sucked into the water outlet pipe 21, so that the air pressure of the water inlet flow passage 3, the water outlet flow passage 4 and the water outlet pipe 21 is reduced, and the liquid water flows in the direction of low air pressure, namely flows in the direction of the water outlet pipe 21. Then, by controlling the switch assembly 23, the first valve 9 installed on the water outlet pipe 21 is closed, the second valve 20 installed on the air injection pipe 22 is opened, the air pump 2 electrically connected with the switch assembly 23 can be selected to generate air pressure, the air pressure generated by the air pump 2 is pressed towards the water outlet flow channel 4 through the air injection pipe 22, so that the liquid water in the water outlet flow channel 4 flows towards the water outlet under the pressure of the air pressure until discharged outside through the water outlet, and the working flow of the gun body 1 is realized.

In the operation of the gun body 1, the inside of the water outlet pipe 21 and the inside of the air injection pipe 2 are respectively sleeved with a filter screen, so that the liquid water in the water inlet and outlet pipe 21 and the air injection pipe 2 is filtered, the damage to the water outlet pipe 21 or the air injection pipe 2 caused by the solid in the liquid water in the water inlet and outlet pipe 21 or the air injection pipe 2 is reduced, and the pore diameter of the filter screen is required to be smaller than the pore diameter of the filter screen sleeved at the water inlet, so that the filter has a further effect on the liquid water. The first valve 9 on the water outlet pipe 21 and the second valve 20 on the air nozzle 22 can be controlled by a micro motor, the micro motor needs to be electrically connected with the switch assembly 23, and the switch assembly 23 needs to be electrically connected with an external power supply, so that the external power supply can provide power under the control of the switch assembly 23 to smoothly open or close the first valve 9 and the second valve 20.

Furthermore, impurities are unavoidable during the flow of the liquid water, and the impurities are also unavoidable to have a clogged state to the water outlet flow passage 4. When the water outlet flow passage 4 is blocked by impurities, the water outlet flow passage 4 applies pressure to the valve core 7 in the pressure relief hole 6 under the air pressure impact of the air pump 2, the valve core 7 is pressed to move towards the water inlet direction, the pressure spring 8 sleeved on the valve core 7 is compressed, a gap is formed between the valve core 7 and the pressure relief hole 6, liquid water in the water outlet flow passage 4 can flow into the water inlet flow passage 3 through the gap flow passage, that is to say, when the water outlet flow passage 4 is blocked by solids, the liquid water in the high-pressure water gun can continuously circulate in the water inlet flow passage 3, the water outlet flow passage 4 and the pressure relief hole 6, so that the load of the air pump 2 is effectively protected, the gun body 1 is not easy to burst, and the gun body is safe and reliable. In the moving process of the valve core 7, the guide rod 9 can be inserted into the water inlet joint 5 to move, so that the valve core 7 cannot deviate in the moving process, and the moving direction of the valve core 7 is limited, thereby being effective and practical. And when the pressure spring 8 compresses the valve core 7 inside the pressure relief hole 6, the second inclined surface 12 on the side wall of the limiting block 11 is propped against the first inclined surface 10 in the pressure relief hole 6, and under the cooperation of the first inclined surface 10 and the second inclined surface 12, the valve core 7 is not easy to move transversely inside the pressure relief hole 6, so that when the high-pressure water gun is used normally, liquid water in the water outlet flow channel 4 is not easy to enter the water inlet flow channel 3 through the pressure relief hole 6. And through the first sealing washer 15 on the case 7 for the liquid water in the high-pressure squirt is in normal use in the play water channel 4 is difficult to enter into in the water channel 3 through pressure release hole 6, and through the second sealing washer 18 on the case 7, just when first sealing washer 15 became invalid, still can seal case 7 and pressure release hole 6, let the liquid water in the play water channel 4 of high-pressure squirt be difficult to enter into in the water channel 3 through pressure release hole 6, the high-pressure squirt alright smooth work of going on.

The control of the valve I19 of the water outlet pipe 21 and the valve II 20 of the air ejector pipe 22 on the air pump 2 is matched with the water inlet flow channel 3, the water outlet flow channel 4 and the pressure relief hole 6, so that the purpose of controlling the flow of liquid water through the change of air pressure can be achieved, and the valve core 7 and the pressure relief hole 6 are conveniently sealed, thereby being safe and reliable. In order to further ensure the safety of the high-pressure water gun, the water inlet flow passage 3, the water outlet flow passage 4, the pressure relief hole 6, the water outlet pipe 21 and the air jet pipe 22 can be sleeved with a protective sleeve made of stone stainless steel, so that the high-pressure water gun is convenient to assemble and disassemble and can be used for a long time. It should be noted that, the air suction pipe of the air pump 2 may be connected to the top of the front end of the water outlet pipe 21, the rear end of the water outlet pipe 21 is connected to the water outlet channel 4, and a filter screen with fine holes may be optionally installed at the flowing position, so that not only the air suction of the air pump 2 can be smoothly performed to absorb the liquid water, but also the probability that the liquid water flows to the air pump 2 through the water outlet pipe 21 is reduced. The air outlet pipeline of the air pump 2 can be communicated with the top of the front end of the air injection pipe 22, and the rear end of the air injection pipe 22 is communicated with the water outlet flow passage 4, so that the air pressure generated by the air pump 2 can be directly exerted on the water outlet flow passage 4, and the probability that liquid water flows to the air pump 2 through the air injection pipe 22 is reduced.

Claims

1. The utility model provides a pneumatic high-pressure water gun structure, characterized by, including rifle body (1) and air pump (2), be equipped with water inlet, delivery port in rifle body (1), water inlet channel (3) and water outlet channel (4), the front end and the water inlet intercommunication of water inlet channel (3), the rear end and the front end intercommunication of water outlet channel (4) of water inlet channel (3), the rear end and the delivery port intercommunication of water outlet channel (4), install outlet pipe (21), air jet tube (22), singlechip and switch module (23) on air pump (2), outlet pipe (21) and air jet tube (22) all communicate with water outlet channel (4), the lower extreme of water inlet channel (3) is all arranged in to outlet pipe (21) and air jet tube (22), the upper end of water inlet channel (3) is arranged in to the delivery port, install air jet valve (19) on outlet pipe (21), install valve two (20) on air jet tube (22), valve one (19), two (20) and air pump (2) and electric motor are connected with air pump (22), filter screen (21) and air jet tube (22) all are connected with air pump (22), filter screen (21) all can be dismantled in the filter screen (21) and air jet tube (22) all.

2. The pneumatic high-pressure water gun structure according to claim 1, wherein a water inlet connector (5) is arranged in the water inlet flow channel (3), a pressure relief hole (6) is formed in the gun body (1), one end of the pressure relief hole (6) is communicated with the water inlet flow channel (3), the other end of the pressure relief hole (6) is communicated with the water outlet flow channel (4), a valve core (7) is arranged in the pressure relief hole (6), the valve core (7) is detachably connected with the gun body (1), a pressure spring (8) is sleeved on the valve core (7), one end of the pressure spring (8) is connected with the valve core (7), and the other end of the pressure spring (8) is connected with the water inlet connector (5).

3. The pneumatic high-pressure water gun structure according to claim 2, wherein a guide rod (9) is sleeved in the water inlet joint (5), one end of the guide rod (9) is detachably connected with the water inlet joint (5), and the other end of the guide rod (9) is connected with the valve core (7).

4. The pneumatic high-pressure water gun structure according to claim 2, wherein a limiting block (11) is mounted on the valve core (7), a first inclined surface (10) and a second inclined surface (12) are arranged in the pressure release hole (6), the first inclined surface (10) is arranged at the communication position of the pressure release hole (6) and the water outlet flow passage (4), the second inclined surface (12) is arranged on the side wall of the limiting block (11), and the second inclined surface (12) is matched with the first inclined surface (10).

5. The pneumatic high-pressure water gun structure according to claim 4, wherein the valve core (7) is provided with a first baffle ring (13) and a second baffle ring (16), a first annular groove (14) is arranged between the first baffle ring (13) and the limiting block (11), a first sealing ring (15) is arranged in the first annular groove (14), a second annular groove (17) is arranged between the second baffle ring (16) and the first baffle ring (13), a second sealing ring (18) is arranged in the second annular groove (17), and the outer edge of the first sealing ring (15) and the outer edge of the second sealing ring (18) are both in contact with the inner wall of the pressure relief hole (6).