CN218863885U

CN218863885U - Natural gas line block valve room

Info

Publication number: CN218863885U
Application number: CN202222189998.7U
Authority: CN
Inventors: 朱健炀; 鲁旭
Original assignee: Individual
Current assignee: Individual
Priority date: 2022-08-19
Filing date: 2022-08-19
Publication date: 2023-04-14
Anticipated expiration: 2032-08-19

Abstract

A natural gas pipeline line block valve chamber relates to the technical field of natural gas block valve chambers; the device comprises a cutoff valve chamber and a main pipeline, wherein the main pipeline penetrates through the cutoff valve chamber, two ends of the main pipeline, which are positioned in the cutoff valve chamber, are connected with cutoff valves through flanges, a gas collecting tank with universal wheels at the bottom is arranged below the main pipeline, an external threaded pipe is integrally connected below the main pipeline between the cutoff valves, the external threaded pipe is communicated with the interior of the main pipeline, the lower end of the external threaded pipe is integrally communicated with a vertical insertion pipe, a first gasket is sleeved on the outer side of the insertion pipe, a third mechanical valve is arranged on the outer side of the insertion pipe, and a gas collecting pipeline assembly is arranged at the top of the gas collecting tank; the gas collection pipeline assembly comprises a first air pump, a connecting pipe, a first mechanical valve, an internal threaded pipe and a first spring, wherein one end of the connecting pipe, which is far away from the first air pump, is rotatably connected with the internal threaded pipe; the inner threaded pipe is fixed with the outer threaded pipe through threaded connection.

Description

Natural gas line block valve room

Technical Field

The utility model relates to a natural gas block valve room technical field, more specifically the utility model relates to a natural gas line way block valve room.

Background

The number of the natural gas pipeline line block valve chambers in the petroleum and natural gas industry is large, and because of the factors such as circumferential weld quality, corrosion perforation, third party damage and pipeline section transportation stop and maintenance accidents caused by pipeline rerouting, the traditional pipeline is limited by the block valve chamber flow design, and the high-pressure natural gas in the pipeline section between two block valve chambers can only be directly emptied and then maintained and maintained, so that a large amount of natural gas is wasted.

As disclosed in publication No.: CN 209655037U's chinese utility model patent relates to a natural gas line circuit block valve room, set up block valve C on the trunk line, a branch pipeline A and branch pipeline B are drawn forth respectively to block valve C's upper and lower streams, set gradually on the branch pipeline A behind block valve A and the atmospheric valve A with be provided with block valve B's branch pipeline B intercommunication, branch pipeline A and branch pipeline B communicate with the atmospheric duct simultaneously, set up atmospheric valve C on the atmospheric duct and communicate with the atmospheric riser, set up at least one compressor interface on the branch pipeline A of block valve A both sides respectively, the compressor interface all communicates with branch pipeline A through compressor interface pipeline. Set up the compressor interface through the branch pipeline in natural gas line shut-off valve room to through compressor interface connection gas collecting device, can realize that natural gas retrieves under the conventional maintenance of general circuit section and the accident condition, greatly reduce natural gas emptying volume, and reduce environmental pollution, promote the whole security of pipeline simultaneously.

However, in the prior art, after the natural gas collecting device collects the full natural gas, the natural gas collecting device cannot be replaced in time, if the natural gas collecting device continues to collect the natural gas, the risk accident that the pressure is too high and the explosion occurs is easily caused, and therefore, a collecting device which can identify whether the natural gas is sufficiently collected and can be replaced in time in a portable mode is urgently needed to solve the problem.

SUMMERY OF THE UTILITY MODEL

The present invention is directed to solve the above-described technical problems in the prior art.

The purpose and the effect of the utility model are achieved by the following specific technical means:

a natural gas pipeline line block valve chamber comprises a block valve chamber and a main pipeline, wherein the main pipeline penetrates through the block valve chamber, both ends of the main pipeline, which are positioned in the block valve chamber, are connected with block valves through flanges, a gas collecting tank with universal wheels at the bottom is arranged below the main pipeline, an external threaded pipe is integrally connected below the main pipeline between the block valves and is communicated with the interior of the main pipeline, the lower end of the external threaded pipe is integrally communicated with a vertical insertion pipe, a first gasket is sleeved outside the insertion pipe, a third mechanical valve is installed outside the insertion pipe, and a gas collecting pipeline assembly is installed at the top of the gas collecting tank;

the gas collection pipeline assembly comprises a first air pump, a connecting pipe, a first mechanical valve, an internal threaded pipe, a first spring and a second gasket, an exhaust nozzle of the first air pump is fixedly communicated with the gas collection tank, an air suction nozzle of the first air pump is connected with the connecting pipe, the first mechanical valve is mounted on the outer side of the connecting pipe and used for controlling the connection and disconnection of the connecting pipe, one end, far away from the first air pump, of the connecting pipe is rotatably connected with the internal threaded pipe, the internal threaded pipe is connected with the first spring, and the top of the first spring is connected with the second gasket; is fixed with the external thread pipe through the threaded connection of the internal thread pipe and the external thread pipe.

Preferably, the second gasket is sleeved on the cannula.

Preferably, the upper end of the main pipeline between the block valves is provided with an exhaust pipeline, and the outer side of the exhaust pipeline is provided with a second mechanical valve.

Preferably, an exhaust stack is attached to an outer side of the cutoff valve chamber, and the exhaust duct is provided to communicate with the exhaust stack.

Preferably, the one-way exhaust pipe is arranged at the upper end of the second mechanical valve on the outer side of the exhaust pipeline, the one-way exhaust pipe is provided with a gas one-way valve for allowing air in the block valve chamber to flow into the exhaust pipeline, an exhaust fan is arranged at the opening of the one-way exhaust pipe, and the block valve chamber is provided with a gas-sensitive alarm.

Preferably, first mechanical valve, second mechanical valve and third mechanical valve all are provided with the valve rod of control mechanical valve, the inside flexible groove that is equipped with of valve rod, the flexible inslot inserts and is provided with the telescopic link, the telescopic link is located flexible inslot and is connected with the piston post, the piston post outside is met with flexible inslot wall slip, telescopic link outside one end is connected with the valve wheel, the outside of piston post is provided with the spacing hole of symmetry, the valve rod corresponds spacing hole screw thread and runs through there is the bolt near the one end outside of valve wheel.

Preferably, a second air pump is installed at the top of the air collection tank, and the second air pump is connected with an air outlet head through a pipeline.

Preferably, the pipeline one end is kept away from to the head of giving vent to anger and is the opening setting, the head of giving vent to anger is inside to be hollow circular slot, hollow circular slot inner wall center an organic whole is connected with cyclic annular flange, cyclic annular flange outside an organic whole is connected with the solid fixed cylinder that runs through, the interpolation is provided with the thimble in the solid fixed cylinder, the diameter of thimble is less than the central through-hole of solid fixed cylinder, the inboard one end of thimble is connected with the piston, the piston agrees with the through-hole of the inboard one end of solid fixed cylinder, and seal the bottom through-hole of solid fixed cylinder, piston bottom and the head of giving vent to anger internal connection have the second spring.

Preferably, the butt joint can be connected with the gas storage tank through a pipeline, a hollow circular groove is formed in the butt joint, a mesh plate is fixed in the butt joint, one end of the outer side of the mesh plate is connected with a top, the butt joint is connected with a pipeline, and a valve and an extrusion ball are installed at the pipeline.

Preferably, the outer side of the butt joint is provided with an external thread, the inner side of the gas outlet head is provided with an internal thread, the butt joint is in threaded connection with the gas outlet head, the ejector pin is pushed after the butt joint is connected, the ejector pin can move inwards, the piston is further pushed to be separated from the through hole in the bottom of the fixed cylinder, and then the gas head and the gas collecting tank are led to form a passage.

Has the advantages that:

1. this kind of natural gas pipeline circuit block valve room is provided with gas collecting pipe assembly, and this application is convenient for install and is dismantled through internal thread pipe and external screw thread pipe threaded connection, and the atmospheric pressure alarm is installed in the gas collecting tank outside, and after the inside collection of gas collecting tank was full of gas, can report to the police through the atmospheric pressure alarm, and the staff then can change the gas collecting tank, all closed third mechanical valve and first mechanical valve, then can pull down gas collecting pipe assembly, then the gas collecting tank of renewal.

Description of the drawings:

figure 1 is the utility model discloses a natural gas line block valve room sketch map.

Fig. 2 is the structure schematic diagram of the gas collecting pipeline assembly of the utility model.

Fig. 3 is a schematic cross-sectional view of the valve stem of the present invention.

Fig. 4 is a schematic cross-sectional view of the air outlet head and the butt joint of the present invention.

In FIGS. 1-4: the air pressure alarm device comprises a cutoff valve chamber 1, a main pipe 2, an external threaded pipe 201, a cannula 202, a first gasket 203, a third mechanical valve 204, a cutoff valve 3, a gas collecting tank 4, a gas collecting pipeline assembly 5, a first air suction pump 501, a connecting pipe 502, a first mechanical valve 503, an internal threaded pipe 504, a first spring 505, a second gasket 506, an exhaust pipeline 6, an exhaust chimney 7, a one-way exhaust pipe 8, an exhaust fan 9, a gas-sensitive alarm 10, a second air suction pump 11, a gas outlet 12, an annular flange 121, a fixed cylinder 122, a thimble 123, a piston 124, a second spring 125, an air pressure alarm 13, a second mechanical valve 14, a valve rod 15, a telescopic groove 151, a telescopic rod 16, a piston column 161, a limiting hole 162, a bolt 17, a valve wheel 18, a butt joint 19, a mesh plate 191, a top 192 and an extrusion ball 193.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments.

Referring to fig. 1-4, a natural gas pipeline line block valve chamber comprises a block valve chamber 1 and a main pipeline 2, wherein the main pipeline 2 penetrates through the block valve chamber 1, both ends of the main pipeline 2, which are positioned inside the block valve chamber 1, are connected with block valves 3 through flanges, an external threaded pipe 201 is integrally connected below the main pipeline 2 between the block valves 3, the external threaded pipe 201 is communicated with the inside of the main pipeline 2, the lower end of the external threaded pipe 201 is integrally communicated with a vertical insertion pipe 202, a first gasket 203 is sleeved outside the insertion pipe 202, a third mechanical valve 204 is installed outside the insertion pipe 202, a gas collection tank 4 is installed below the main pipeline 2 inside the block chamber 1, universal wheels are installed around the bottom of the gas collection tank 4, the gas collection tank 4 can move due to the arrangement of the universal wheels, and a gas collection pipeline assembly 5 is installed at the top of the gas collection tank 4;

the gas collection pipeline assembly 5 comprises a first air pump 501, a connecting pipe 502, a first mechanical valve 503, an internal threaded pipe 504, a first spring 505 and a second gasket 506, an exhaust nozzle of the first air pump 501 is fixedly communicated with the gas collection tank 4, an air suction nozzle of the first air pump 501 is connected with the connecting pipe 502, the first mechanical valve 503 is installed on the outer side of the connecting pipe 502, the first mechanical valve 503 is used for controlling the connection and disconnection of the connecting pipe 502, one end, far away from the first air pump 501, of the connecting pipe 502 is rotatably connected with the internal threaded pipe 504, the first spring 505 is connected inside the internal threaded pipe 504, and the second gasket 506 is connected to the top of the first spring 505; the internal thread pipe 504 is fixedly connected with the external thread pipe 201 through threads, the second gasket 506 is arranged corresponding to the insertion pipe 202 in a sleeved mode, the internal thread pipe 504 and the external thread pipe 201 can be connected tightly through the first gasket 203 and the second gasket 506, natural gas is not prone to leaking, the cut-off valve 3 is closed, the first mechanical valve 503 and the third mechanical valve 204 are opened, the first air suction pump 501 is started, natural gas in the main pipeline 2 between the cut-off valves 3 is guided into the gas collecting tank 4 through the first air suction pump 501, after extraction is completed, the first mechanical valve 503 and the third mechanical valve 204 are closed, the gas collecting tank 4 is conveniently mounted and dismounted through threaded connection of the internal thread pipe 504 and the external thread pipe 201, the air pressure alarm 13 is mounted on the outer side of the gas collecting tank 4, when the inside of the gas collecting tank 4 is full of air, an alarm can be given through the air pressure alarm 13, a worker can replace the gas collecting tank 4, the third mechanical valve 204 and the first mechanical valve 503 are closed, the gas collecting pipeline assembly 5 can be dismounted, and the new gas collecting tank 4 can be replaced.

An exhaust pipeline 6 is installed at the upper end of the main pipeline 2 between the block valves 3, a second mechanical valve 14 is installed on the outer side of the exhaust pipeline 6, an exhaust chimney 7 is installed on the outer side of the block valve chamber 1, the exhaust pipeline 6 is communicated with the exhaust chimney 7, after the gas collecting tank 4 collects natural gas inside the main pipeline 2, part of residual natural gas cannot be collected, and then the second mechanical valve 14 can be opened to be emptied through the exhaust pipeline 6 and the exhaust chimney 7.

Furthermore, a one-way exhaust pipe 8 is arranged at the upper end of the second mechanical valve 14 on the outer side of the exhaust pipeline 6, a gas one-way valve for enabling air in the cutoff valve chamber 1 to flow into the exhaust pipeline 6 is arranged on the one-way exhaust pipe 8, and an exhaust fan 9 is arranged at an opening of the one-way exhaust pipe 8;

the gas sensitive alarm 10 is installed to cutoff valve room 1, and gas sensitive alarm 10 is used for monitoring whether the natural gas has been revealed to cutoff valve room 1 inside, and gas sensitive alarm 10 sounds the back, can start exhaust fan 9, and the natural gas that will cut off in the valve room 1 is by the leading-in exhaust duct 6 of one-way exhaust pipe 8, and the evacuation through exhaust chimney 7 prevents that personnel from getting into cutoff valve room 1 and appearing the safety risk at last.

The first mechanical valve 503, the second mechanical valve 14 and the third mechanical valve 204 are all provided with a valve rod 15 for controlling the mechanical valve, a telescopic groove 151 is arranged inside the valve rod 15, a telescopic rod 16 is inserted into the telescopic groove 151, the telescopic rod 16 is positioned in the telescopic groove 151 and connected with a piston post 161, the outer side of the piston post 161 is connected with the inner wall of the telescopic groove 151 in a sliding manner, one end of the outer side of the telescopic rod 16 is connected with a valve wheel 18, the outer side of the piston post 161 is provided with symmetrical limiting holes 162, a bolt 17 penetrates through the outer side of one end, close to the valve wheel 18, of the valve rod 15 corresponding to the limiting holes 162 in a threaded manner, when the piston post 161 is in the telescopic groove 151, the valve rod 15 cannot be driven by rotating the valve wheel 18, mistakenly touching the first mechanical valve 503, the second mechanical valve 14 and the third mechanical valve 204 is prevented, when the first mechanical valve 503, the second mechanical valve 14 and the third mechanical valve 204 need to be opened, the piston wheel 18 needs to be pulled by the valve wheel 18, so that the piston post 161 moves to the bolt 17, the bolt 17 can enable the bolt 17 to be inserted into the limiting holes 162, or the bolt 17 only clamp the piston post 161, so that the valve wheel 161 can be rotated to drive the valve rod 15 and the third mechanical valve 204 to be closed, and the valve 15, and the mechanical valve 204 can be closed.

Furthermore, a second air pump 11 is installed at the top of the air collecting tank 4, the second air pump 11 is connected with an air outlet head 12 through a pipeline, one end of the air outlet head 12, which is far away from the pipeline, is provided with an opening, a hollow circular groove is formed inside the air outlet head 12, an annular flange 121 is integrally connected to the center of the inner wall of the hollow circular groove, a penetrating fixed cylinder 122 is integrally connected to the outer side of the annular flange 121, a thimble 123 is inserted into the fixed cylinder 122, the diameter of the thimble 123 is smaller than the central penetrating port of the fixed cylinder 122, one end of the inner side of the thimble 123 is connected with a piston 124, the piston 124 is fitted with the penetrating port at one end of the inner side of the fixed cylinder 122 and seals the bottom penetrating port of the fixed cylinder 122, and the bottom of the piston 124 and the inside of the air outlet head 12 are connected with a second spring 125; when the thimble 123 is pushed, the thimble 123 moves inward, and the piston 124 is pushed to separate from the through hole at the bottom of the fixed cylinder 122, so that the gas head 12 and the gas collection tank 4 form a passage.

Furthermore, the butt joint 19 is arranged corresponding to the air outlet 12, a hollow circular groove is formed inside the butt joint 19, a mesh plate 191 is fixed inside the butt joint 19, one end of the outer side of the mesh plate 191 is connected with a top 192, the butt joint 19 is connected with a pipeline, and a valve and an extrusion ball 193 are arranged at the pipeline; the gas storage tank can be connected to the butt joint 19 through a pipeline, when the natural gas of the gas collecting tank 4 needs to be transferred, the butt joint 19 can be inserted into the gas outlet 12, the outer side of the butt joint 19 is provided with external threads, the inner side of the gas outlet 12 is provided with internal threads, the butt joint 19 is in threaded connection with the gas outlet 12, the ejector pin 123 is pushed by the ejector head 192 after connection, the ejector pin 123 can move inwards, the piston 124 is pushed to be separated from a through hole in the bottom of the fixed cylinder 122, the gas outlet 12 and the gas collecting tank 4 are enabled to form a passage, a valve is opened, the extrusion ball 193 is pressed, the natural gas in the gas collecting tank 4 is guided into the gas storage tank, and the natural gas is convenient to transfer.

The working principle is as follows:

when in use, the block valve 3 is closed, the first mechanical valve 503 and the third mechanical valve 204 are opened, the first air pump 501 is started, the natural gas in the main pipeline 2 between the block valves 3 is led into the gas collection tank 4 through the first air pump 501, after the extraction is finished, when the first mechanical valve 503 and the third mechanical valve 204 are closed, part of the residual natural gas cannot be collected, the second mechanical valve 14 can be opened and evacuated through the exhaust pipe 6 and the exhaust chimney 7, the gas-sensitive alarm 10 is used for monitoring whether natural gas leaks in the inside of the cutoff valve chamber 1, after the gas-sensitive alarm 10 rings, the exhaust fan 9 can be started, natural gas in the block valve chamber 1 is guided into the exhaust pipeline 6 through the one-way exhaust pipe 8 and is exhausted through the exhaust chimney 7, so that safety risk of personnel entering the block valve chamber 1 is prevented, the air pressure alarm 13 is installed on the outer side of the air collecting tank 4, when the gas collection tank 4 is filled with gas, an alarm can be given through the gas pressure alarm 13, the gas collection tank 4 can be replaced by a worker, the third mechanical valve 204 and the first mechanical valve 503 are both closed, the gas collection pipeline assembly 5 can be detached, then the gas collection tank 4 is replaced, if the gas collection tank 4 is not available, the natural gas can be transferred by using the gas storage tank, the butt joint 19 can be inserted into the gas outlet 12, the outer side of the butt joint 19 is provided with an external thread, the inner side of the gas outlet 12 is provided with an internal thread, the butt joint 19 is in threaded connection with the gas outlet 12, the connecting top 192 pushes the thimble 123 to enable the thimble 123 to move inwards, and then the piston 124 is pushed to separate from the through hole at the bottom of the fixed cylinder 122, so that the gas head 12 and the gas collecting tank 4 form a passage, the valve is opened, the extrusion ball 193 is pressed, and the natural gas in the gas collecting tank 4 is guided into the gas storage tank, so that the natural gas is convenient to transfer.

Claims

1. A natural gas pipeline line block valve chamber comprises a block valve chamber (1) and a main pipeline (2), wherein the main pipeline (2) penetrates through the block valve chamber (1), the main pipeline (2) is located at two ends inside the block valve chamber (1) and is connected with block valves (3) through flanges, and the natural gas pipeline line block valve chamber is characterized in that a gas collection tank (4) with a universal wheel at the bottom is arranged below the main pipeline (2), an external threaded pipe (201) is integrally connected below the main pipeline (2) between the block valves (3), the external threaded pipe (201) is communicated with the inside of the main pipeline (2), a vertical insertion pipe (202) is integrally communicated with the lower end of the external threaded pipe (201), a first gasket (203) is sleeved outside the insertion pipe (202), a third mechanical valve (204) is installed outside the insertion pipe (202), and a gas collection pipeline assembly (5) is installed at the top of the gas collection tank (4);

the gas collection pipeline assembly (5) comprises a first air pump (501), a connecting pipe (502), a first mechanical valve (503), an internal threaded pipe (504), a first spring (505) and a second gasket (506), an exhaust nozzle of the first air pump (501) is fixedly communicated with the gas collection tank (4), the air exhaust nozzle of the first air pump (501) is connected with the connecting pipe (502), the first mechanical valve (503) is installed on the outer side of the connecting pipe (502), the first mechanical valve (503) is used for controlling the connection and disconnection of the connecting pipe (502), one end, far away from the first air pump (501), of the connecting pipe (502) is rotatably connected with the internal threaded pipe (504), the internal part of the internal threaded pipe (504) is connected with the first spring (505), and the top of the first spring (505) is connected with the second gasket (506); the inner threaded pipe (504) is in threaded connection and fixed with the outer threaded pipe (201).

2. The natural gas line segment valve compartment of claim 1, wherein the second gasket (506) is disposed to correspond to the sleeve of the insert pipe (202).

3. The natural gas line segment valve chamber according to claim 1, wherein an exhaust pipe (6) is installed at the upper end of the main pipe (2) between the segment valves (3), and a second mechanical valve (14) is installed at the outer side of the exhaust pipe (6).

4. The natural gas pipeline block valve compartment as claimed in claim 3, wherein an exhaust stack (7) is installed outside the block valve compartment (1), and the exhaust pipeline (6) is provided in communication with the exhaust stack (7).

5. The natural gas pipeline line block valve chamber as in claim 4, characterized in that the one-way exhaust pipe (8) is installed on the upper end of the second mechanical valve (14) outside the exhaust pipe (6), the one-way exhaust pipe (8) is installed with a gas one-way valve which allows air in the block valve chamber (1) to flow into the exhaust pipe (6), the exhaust fan (9) is installed at the opening of the one-way exhaust pipe (8), and the gas-sensitive alarm (10) is installed in the block valve chamber (1).

6. The natural gas pipeline line block valve chamber according to claim 3, wherein the first mechanical valve (503), the second mechanical valve (14) and the third mechanical valve (204) are provided with valve rods (15) for controlling the mechanical valves, telescopic grooves (151) are formed in the valve rods (15), telescopic rods (16) are inserted into the telescopic grooves (151), the telescopic rods (16) are located in the telescopic grooves (151) and connected with piston columns (161), the outer sides of the piston columns (161) are connected with the inner walls of the telescopic grooves (151) in a sliding mode, one ends of the outer sides of the telescopic rods (16) are connected with valve wheels (18), symmetrical limiting holes (162) are formed in the outer sides of the piston columns (161), and bolts (17) are threaded through the outer sides of the ends, close to the valve wheels (18), of the valve rods (15) and correspond to the limiting holes (162).

7. The natural gas pipeline block valve according to claim 1, wherein a second air pump (11) is installed on the top of the air collecting tank (4), and the second air pump (11) is connected with an air outlet head (12) through a pipeline.

8. The natural gas pipeline line block valve chamber according to claim 7, wherein the gas outlet head (12) is provided with an opening at one end far away from the pipeline, the gas outlet head (12) is provided with a hollow circular groove inside, the center of the inner wall of the hollow circular groove is integrally connected with an annular flange (121), the outer side of the annular flange (121) is integrally connected with a through fixed cylinder (122), a thimble (123) is inserted into the fixed cylinder (122), the diameter of the thimble (123) is smaller than the central through hole of the fixed cylinder (122), one end of the inner side of the thimble (123) is connected with a piston (124), the piston (124) is fitted with the through hole at one end of the inner side of the fixed cylinder (122) and seals the through hole at the bottom of the fixed cylinder (122), and the bottom of the piston (124) is connected with a second spring (125) inside the gas outlet head (12).

9. The natural gas pipeline block valve chamber according to claim 8, further comprising a butt joint (19), wherein the butt joint (19) can be connected with the gas storage tank through a pipeline, a hollow circular groove is formed inside the butt joint (19), a mesh plate (191) is fixed inside the butt joint (19), one end of the outer side of the mesh plate (191) is connected with a top head (192), the butt joint (19) is connected with a pipeline, and a valve and an extrusion ball (193) are installed at the pipeline.

10. The natural gas pipeline line block valve chamber as claimed in claim 9, wherein the outer side of the butt joint (19) is provided with an external thread, the inner side of the gas outlet (12) is provided with an internal thread, the butt joint (19) is in threaded connection with the gas outlet (12), and after connection, the thimble (123) is pushed by the thimble (192) so that the thimble (123) can move inwards to push the piston (124) to be separated from the through hole at the bottom of the fixed cylinder (122), so that the gas outlet (12) and the gas collecting tank (4) form a passage.