Gas leakage protection control device for gas metering test

Abstract

The present application relates to gas meter test gas leakage protection automatic control device technical field, specifically is a kind of gas meter measurement test gas leakage protection control device, the present application includes test box and the gas meter in test box, test box is provided with gas sending control mechanism, gas recovery control mechanism and two gas leakage control devices;Gas sending control mechanism includes gas sending connecting pipe, the present application is linked by setting transverse displacement control mechanism with gas sending control mechanism, gas recovery control mechanism, when gas sensor triggers, two-way electric telescopic rod can immediately switch the position of first sending control plug, second sending control plug and first recovery control plug, second recovery control plug, to realize the automatic cut-off of gas sending pipe and the automatic conduction of nitrogen sending pipe, without manual intervention can complete the safety switching of gas source, greatly improve the safety of test process.

Description

Technical Field

[0001] This invention relates to the manufacture of industrial automatic control system devices, and more particularly to the technical field of automatic control equipment for gas meter testing and leakage protection, specifically a gas meter metering and testing leakage protection control device. Background Technology

[0002] As a key instrument for gas metering and billing, gas meters, especially those with inlet and outlet pipes made of different materials, usually need to be connected to a special test pipeline and a specified flow of gas is introduced to verify their metering performance and whether the sealing of the inlet, outlet pipe and external pipeline meets the standards.

[0003] In the prior art, such as the gas meter leak warning box proposed in patent application number "CN201520631190.7", the connection between the gas meter inlet and the pipeline and the connection between the gas outlet and the pipeline are placed in a sealed box. By installing a gas detection sensor in the box, when a leak occurs at the connection, the sensor triggers a buzzer outside the box to issue an alarm, thereby prompting the operator to take action.

[0004] However, in the existing technology, when a gas leak alarm occurs, there is still gas inside the pipeline and gas meter. If it is directly disassembled and repaired, residual gas leakage may occur, causing safety hazards. At the same time, it cannot help operators quickly and accurately locate the specific leak point in the connection between the gas inlet and the gas outlet. Summary of the Invention

[0005] The purpose of this invention is to provide a gas meter metering and testing leakage protection and control device to solve the problems mentioned in the background art.

[0006] The objective of this invention can be achieved through the following technical solutions: A gas meter metering test leakage protection control device includes a test chamber and a gas meter located inside the test chamber. The test chamber is equipped with a gas supply control mechanism, a gas recovery control mechanism and two leakage control devices. The gas supply control mechanism includes a gas supply connecting pipe, and the gas supply connecting pipe and the gas meter inlet on the top of the gas meter are fixedly installed. The gas recovery control mechanism includes a gas recovery connecting pipe, and the gas recovery connecting pipe and the gas meter outlet on the top of the gas meter are fixedly installed. Both gas leakage control devices include a fixed arc-shaped sleeve and a movable arc-shaped sleeve. The fixed arc-shaped sleeve and the movable arc-shaped sleeve cover the connection of the gas meter inlet pipe and the connection of the gas meter outlet pipe from both sides, respectively, forming an inlet pipe leakage control chamber on the outside of the gas meter inlet pipe and an outlet pipe leakage control chamber on the outside of the connection with the gas meter outlet pipe.

[0007] A detection and conduction switching control device is installed between the two leakage control devices, and the devices are connected to each other to achieve the purging and replacement of leaked gas.

[0008] Preferably, the gas delivery control mechanism further includes a gas delivery transverse pipe, a gas delivery pipe fixed to the end of the gas delivery transverse pipe and bent upward, a nitrogen delivery pipe fixed to the top of the gas delivery transverse pipe, and a gas delivery connecting pipe fixed to the bottom of the gas delivery transverse pipe. A gas delivery push rod is provided at one end of the gas delivery transverse tube. One end of the gas delivery push rod extends into the gas delivery transverse tube. A first delivery control plug and a second delivery control plug are fixedly connected to the outer surface of the gas delivery push rod and located inside the gas delivery transverse tube. A nitrogen delivery control chamber is formed between the first delivery control plug and the second delivery control plug.

[0009] Preferably, the gas recovery control mechanism further includes a gas recovery horizontal pipe, a gas recovery pipe fixed to the end of the gas recovery horizontal pipe and bent upward, a nitrogen recovery pipe fixed to the top of the gas recovery horizontal pipe, and a gas recovery connecting pipe fixed to the bottom of the gas recovery horizontal pipe. A recovery push rod is provided at one end of the gas recovery transverse tube. One end of the recovery push rod extends into the gas recovery transverse tube. A first recovery control plug and a second recovery control plug are fixedly connected to the outer surface of the recovery push rod and located inside the gas recovery transverse tube. A nitrogen recovery control chamber is formed between the first recovery control plug and the second recovery control plug.

[0010] Preferably, a lateral displacement control mechanism is provided inside the test chamber and above the gas meter. The lateral displacement control mechanism includes a concave support frame, on which a cylinder bracket is fixedly installed. A bidirectional electric telescopic rod is fixedly installed on the cylinder bracket. Movable plates are fixedly connected to both ends of the bidirectional electric telescopic rod. The two movable plates are fixedly connected to the feed push rod and the retraction push rod, respectively, and can drive the feed push rod and the retraction push rod to move in opposite directions.

[0011] Preferably, the top and bottom of the fixed arc sleeve and the movable arc sleeve on opposite sides are fixedly connected with sealing rubber, and a second connecting bracket is fixedly connected to one side of the fixed arc sleeve. The second connecting bracket is fixedly connected to the inner wall of the test chamber to provide fixation and support for the fixed arc sleeve.

[0012] Preferably, a closing control mechanism is provided on each side of the two leakage control devices that are far apart from each other. The closing control mechanism includes a fixed bracket fixed to the inner wall of the test chamber. A control screw is threaded onto the fixed bracket. A movable bracket is rotatably connected to one end of the control screw. Two push-pull parts are fixedly connected to one side of the movable bracket. The ends of the two push-pull parts are fixedly connected to a movable arc sleeve.

[0013] Preferably, two guide shafts are fixedly connected to one side of the fixed bracket, and the guide shafts are slidably connected to the movable bracket.

[0014] Preferably, the detection and conduction switching control device includes an interface pipe, which is fixedly connected to a fixed arc sleeve and communicates with the air inlet leakage control chamber. One end of the interface pipe is fixedly connected to a vertical pipe, and one side of the vertical pipe is fixedly connected to a control pipe and a conduction pipe. Both the control pipe and the conduction pipe are fixedly connected to another fixed arc sleeve and communicate with the air outlet leakage control chamber. A gas sensor is installed on the conduction pipe. A vertical piston that can move up and down is installed inside the vertical tube. The vertical piston is initially located at the top and can close the open end of the control tube.

[0015] Preferably, the control tube is provided with an extension end, the radius of which is larger than that of the control tube. A limit sleeve is fixedly connected to the inner wall of the extension end through a connecting shaft. One end of the limit sleeve is designed as an open type, and the other end is designed as an open type. A return spring is fixedly connected inside the limit sleeve. A control piston is fixedly connected to one end of the return spring. The control piston extends into the control tube. A limit ring is fixedly connected inside the control tube and at the end of the control piston. A diversion port with an electromagnetic one-way valve is fixedly installed on the gas recovery connection pipe.

[0016] Preferably, a vertical displacement control mechanism is provided on one side of the concave support frame. The vertical displacement control mechanism includes a movable slot and a vertical rod. The movable slot is opened on one side of the concave support frame. A movable connecting rod is fixedly connected to one side of the movable plate. The movable connecting rod passes through the movable slot and is fixedly connected to an inclined pressure plate. The vertical rod is fixed to the bottom of the cylinder bracket. A bearing ring is fixedly connected to the bottom of the vertical rod. A tension spring is fixedly connected to the top of the bearing ring. A lifting bar is slidably connected to the vertical rod. The top of the tension spring and the lifting bar are fixedly connected. A lifting shaft is fixedly connected to the bottom of one end of the lifting bar. The bottom of the lifting shaft extends into the vertical tube and is fixedly connected to the vertical piston. A pressure sealing ring is fixedly connected to the lifting shaft. A rotating shaft is rotatably connected to one end of the lifting bar, and the inclined surface of the inclined pressure plate abuts against the top of the rotating shaft.

[0017] The beneficial effects of this invention are: I. This invention, by setting up a linkage between the lateral displacement control mechanism, the gas delivery control mechanism, and the gas recovery control mechanism, allows the bidirectional electric telescopic rod to immediately switch the positions of the first delivery control plug, the second delivery control plug, the first recovery control plug, and the second recovery control plug when the gas sensor is triggered. This achieves automatic shut-off of the gas delivery pipe and automatic opening of the nitrogen delivery pipe, enabling safe switching of the gas source without manual intervention and significantly improving the safety of the testing process.

[0018] Second, this invention, by setting up a leakage control device composed of a fixed arc-shaped sleeve and a movable arc-shaped sleeve, and cooperating with the control screw and push-pull component in the closing control mechanism, can form independent inlet leakage control chambers and outlet leakage control chambers on the outside of the connection between the gas meter inlet and outlet, respectively, to confine the leaked gas within a very small area, prevent the gas from spreading to the entire test chamber, and improve the detection sensitivity and response speed.

[0019] Third, this invention, by setting up a detection and conduction switching control device including a vertical piston, a control tube, and a control piston, combined with the mechanical linkage between the inclined pressure plate and the lifting bar plate in the vertical displacement control mechanism, realizes the automatic switching between detection mode and purging replacement mode. During the purging stage, the pressure difference is used to push the control piston to move unidirectionally or bidirectionally between the limit sleeve and the limit ring. This not only indicates whether the leak occurs on the side of the inlet leak control chamber or the side of the outlet leak control chamber, but also realizes the directional purging and unidirectional discharge of nitrogen on the leaking gas, effectively reducing the risk of excessive gas leakage during unpacking and maintenance. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is the present invention. Figure 1 A schematic diagram of the structure of the gas meter section; Figure 3 This is the present invention. Figure 2 Schematic diagram of the gas feeding control mechanism and the gas recovery control mechanism; Figure 4 This is the present invention. Figure 3 Rear view of the recessed support frame section; Figure 5 This is the present invention. Figure 4 A schematic diagram of the bottom structure of the concave support frame; Figure 6 This is the present invention. Figure 5 Enlarged view of point A in the middle; Figure 7 This is the present invention. Figure 3 Cross-sectional view of the gas supply control mechanism and the gas recovery control mechanism; Figure 8 This is the present invention. Figure 3 A schematic diagram showing the connection between the two leakage control devices. Figure 9This is the present invention. Figure 8 Cross-sectional view of the leakage control device section; Figure 10 This is the present invention. Figure 9 A schematic diagram of the control tube section.

[0021] The attached figures are labeled as follows: 1. Test chamber; 2. Gas meter; 201. Gas meter inlet; 202. Gas meter outlet; 301. Gas inlet horizontal pipe; 302. Gas inlet pipe; 303. Nitrogen inlet pipe; 304. Gas inlet connecting pipe; 305. Inlet push rod; 306. First inlet control plug; 307. Second inlet control plug; 308. Nitrogen inlet control chamber; 401. Gas recovery horizontal pipe; 402. Gas recovery pipe; 40 3. Nitrogen recovery pipe; 404. Gas recovery connecting pipe; 405. Recovery push rod; 406. First recovery control plug; 407. Second recovery control plug; 408. Nitrogen recovery control chamber; 501. Concave support frame; 502. Cylinder bracket; 503. Bidirectional electric telescopic rod; 504. Movable plate; 505. Guide plate; 506. First connecting bracket; 601. Fixed arc-shaped sleeve; 602. Movable arc-shaped sleeve; 603. 604. Sealing rubber; 605. Inlet leakage control chamber; 606. Outlet leakage control chamber; 607. Second connecting bracket; 701. Fixed bracket; 702. Control screw; 703. Movable bracket; 704. Push-pull component; 705. Guide shaft; 801. Interface pipe; 802. Vertical pipe; 803. Control pipe; 804. Conductor pipe; 805. Gas sensor; 806. Vertical piston; 807. Extension end; 808. 8. Limit sleeve; 809. Return spring; 810. Control piston; 811. Limit ring; 812. Diverter port; 901. Movable slot; 902. Vertical lifting rod; 903. Movable connecting rod; 904. Inclined pressure plate; 905. Bearing ring; 906. Tension spring; 907. Lifting bar; 908. Lifting shaft; 909. Rotating shaft; 910. Press sealing ring; 10. Threaded shaft; 11. Lifting plate; 12. Threaded sleeve. Detailed Implementation

[0022] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] like Figure 1 , Figure 2 , Figure 3 and Figure 4A gas meter metering test leakage protection control device includes a test chamber 1 and a gas meter 2 to be tested located inside the test chamber 1. The test chamber 1 has a sealable door with a viewing window to observe the test inside the test chamber 1. The top of the gas meter 2 is provided with a gas meter inlet 201 and a gas meter outlet 202. Gas meters with gas meter inlet 201 and gas meter outlet 202 are existing technologies, and how they measure the incoming gas will not be described here.

[0024] like Figure 3 and Figure 7 Inside the test chamber 1 and above the gas meter 2, there is a gas supply control mechanism and a gas recovery control mechanism. The gas supply control mechanism is connected to the gas meter inlet 201, and the gas recovery control mechanism is connected to the gas meter outlet 202, which are used to supply gas into the gas meter 2 and recover gas after passing through the gas meter 2, respectively. The gas supply control mechanism includes a gas supply horizontal pipe 301, a gas supply pipe 302 fixed to the end of the gas supply horizontal pipe 301 and bent upward, a nitrogen supply pipe 303 fixed to the top of the gas supply horizontal pipe 301, and a gas supply connecting pipe 304 fixed to the bottom of the gas supply horizontal pipe 301. The gas supply connecting pipe 304 and the gas meter inlet 201 are fixedly installed. A push rod 305 is provided at one end of the gas inlet transverse tube 301. One end of the push rod 305 extends into the gas inlet transverse tube 301. A first inlet control plug 306 and a second inlet control plug 307 are fixedly connected to the outer surface of the push rod 305 and located inside the gas inlet transverse tube 301. A nitrogen inlet control chamber 308 is formed between the first inlet control plug 306 and the second inlet control plug 307.

[0025] like Figure 3 and Figure 7 The gas recovery control mechanism includes a gas recovery horizontal pipe 401, a gas recovery pipe 402 fixed to the end of the gas recovery horizontal pipe 401 and bent upward, a nitrogen recovery pipe 403 fixed to the top of the gas recovery horizontal pipe 401, and a gas recovery connecting pipe 404 fixed to the bottom of the gas recovery horizontal pipe 401. The gas recovery connecting pipe 404 and the gas meter outlet 202 are fixedly installed. A recovery push rod 405 is provided at one end of the gas recovery transverse tube 401. One end of the recovery push rod 405 extends into the gas recovery transverse tube 401. A first recovery control plug 406 and a second recovery control plug 407 are fixedly connected to the outer surface of the recovery push rod 405 and located inside the gas recovery transverse tube 401. A nitrogen recovery control chamber 408 is formed between the first recovery control plug 406 and the second recovery control plug 407.

[0026] The installation methods of the gas inlet connecting pipe 304 and the gas meter inlet pipe 201, and the installation methods of the gas recovery connecting pipe 404 and the gas meter outlet pipe 202 are all existing technologies, and can be threaded, flanged or compression fitting.

[0027] like Figure 1 The gas inlet pipe 302, nitrogen inlet pipe 303, gas recovery pipe 402, and nitrogen recovery pipe 403 all penetrate the test chamber 1 and extend to the outside of the test chamber 1. The outer surfaces of the gas inlet pipe 302, nitrogen inlet pipe 303, gas recovery pipe 402, and nitrogen recovery pipe 403 are all fixedly connected to the top of the test chamber 1. The gas inlet pipe 302 is connected to an external gas delivery container, the nitrogen inlet pipe 303 is connected to an external nitrogen delivery container, the gas recovery pipe 402 is connected to an external gas recovery container, and the nitrogen recovery pipe 403 is connected to an external nitrogen recovery container. The external containers are all equipped with check valves to prevent nitrogen or gas from flowing back.

[0028] like Figure 3 and Figure 4 A lateral displacement control mechanism is installed inside the test chamber 1 and above the gas meter 2. The lateral displacement control mechanism includes a concave support frame 501, on which a cylinder bracket 502 is fixedly installed. A bidirectional electric telescopic rod 503 is fixedly installed on the cylinder bracket 502. Movable plates 504 are fixedly connected to both ends of the bidirectional electric telescopic rod 503. The two movable plates 504 are fixedly connected to the feed push rod 305 and the retraction push rod 405 respectively, and can drive the feed push rod 305 and the retraction push rod 405 to move in opposite directions.

[0029] Guide plates 505 are fixedly connected to the inner sidewalls at both ends of the concave support frame 501. The guide plates 505 and the movable plate 504 are slidably connected, which can ensure that the movable plate 504 and the feed push rod 305 and the retraction push rod 405 fixed thereto can only move in the horizontal direction. The outer walls at both ends of the concave support frame 501 are fixedly connected to the first connecting bracket 506. The ends of the first connecting bracket 506 are fixedly connected to the inner wall of the test box 1, which can provide fixation and support for the concave support frame 501.

[0030] like Figure 3 , Figure 8 and Figure 9Leakage control devices are provided on the outside of the connection between the gas inlet connecting pipe 304 and the gas meter inlet pipe 201, and on the outside of the connection between the gas recovery connecting pipe 404 and the gas meter outlet pipe 202. The leakage control devices include a fixed arc-shaped sleeve 601 and a movable arc-shaped sleeve 602. Sealing rubber 603 is fixedly connected to the top and bottom of the opposite side of the fixed arc-shaped sleeve 601 and the movable arc-shaped sleeve 602. The fixed arc-shaped sleeve 601 and the movable arc-shaped sleeve 602 can be fitted together to form a complete tubular closed sleeve, and a sealing ring structure is formed by the sealing rubber 603, forming a seal from the outside of the connection between the gas recovery connecting pipe 404 and the gas meter outlet pipe 202 or the outside of the connection between the gas inlet connecting pipe 304 and the gas meter inlet pipe 201.

[0031] One of the gas leakage control devices is used to seal the outside of the connection between the gas supply connecting pipe 304 and the gas meter inlet pipe 201, and forms the inlet pipe leakage control chamber 604; the other gas leakage control device is used to seal the outside of the connection between the gas recovery connecting pipe 404 and the gas meter outlet pipe 202, and forms the outlet pipe leakage control chamber 605.

[0032] A second connecting bracket 606 is fixedly connected to one side of the fixed arc sleeve 601. The second connecting bracket 606 is fixedly connected to the inner wall of the test chamber 1 and is used to provide fixation and support for the fixed arc sleeve 601.

[0033] like Figure 3 and Figure 8 Two leakage control devices are symmetrically arranged. A closing control mechanism is provided on the side of the two leakage control devices that are far apart from each other. The closing control mechanism includes a fixed bracket 701 fixed to the inner wall of the test chamber 1. A control screw 702 is threadedly connected to the fixed bracket 701. A movable bracket 703 is rotatably connected to one end of the control screw 702. Two push-pull parts 704 are fixedly connected to one side of the movable bracket 703. The ends of the two push-pull parts 704 are fixedly connected to the movable arc sleeve 602, so that when the control screw 702 is rotated in different directions, the movable arc sleeve 602 can be moved closer to or away from the fixed arc sleeve 601 through the movable bracket 703 and the push-pull parts 704. Two guide shafts 705 are fixedly connected to one side of the fixed bracket 701. The guide shafts 705 and the movable bracket 703 are slidably connected, which can ensure that the movable bracket 703, the push-pull component 704 and the movable arc sleeve 602 can only move laterally, thereby ensuring the precise docking of the movable arc sleeve 602 and the fixed arc sleeve 601.

[0034] like Figure 8 , Figure 9 and Figure 10A detection and conduction switching control device is provided between the two leakage control devices. The detection and conduction switching control device includes an interface pipe 801, which is fixedly connected to a fixed arc sleeve 601 and communicates with the leakage control chamber 604 at the air inlet. A vertical pipe 802 is fixedly connected to one end of the interface pipe 801. A control pipe 803 and a conduction pipe 804 are fixedly connected to one side of the vertical pipe 802. Both the control pipe 803 and the conduction pipe 804 are fixedly connected to another fixed arc sleeve 601 and communicate with the leakage control chamber 605 at the air outlet. A gas sensor 805 is installed on the conduction pipe 804. The gas sensor 805 and the bidirectional electric telescopic rod 503 are both connected to an external power source through wires. After the wires pass through the test chamber 1, they are sealed with sealant to ensure the airtightness of the test chamber 1. The device is also linked and controlled by an external microcontroller.

[0035] A vertical piston 806 that can move up and down is provided inside the vertical pipe 802. The vertical piston 806 is initially located at the top and can close the open end of the control pipe 803. At this time, the gas inlet leakage control chamber 604 and the gas outlet leakage control chamber 605 are connected through the interface pipe 801, the vertical pipe 802 and the connecting pipe 804. No matter if there is a leak at the connection between the gas recovery connecting pipe 404 and the gas meter outlet 202 or at the connection between the gas supply connecting pipe 304 and the gas meter inlet 201, the gas can enter the connecting pipe 804 and be sensed by the gas sensor 805. The control tube 803 is provided with an extension end 807, the radius of which is larger than that of the control tube 803. The inner wall of the extension end 807 is fixedly connected to a limit sleeve 808 via a connecting shaft. One end of the limit sleeve 808 is open and the other end is perforated. A return spring 809 is fixedly connected inside the limit sleeve 808. One end of the return spring 809 is fixedly connected to a control piston 810. The control piston 810 extends into the control tube 803. A limit ring 811 is fixedly connected inside the control tube 803 and at the end of the control piston 810. A diversion port 812 with an electromagnetic check valve is fixedly installed on the gas recovery connection pipe 404. The diversion port 812 is located in the gas outlet leakage control chamber 605. The electromagnetic check valve is existing technology, externally powered, and is linked with the gas sensor 805 through an external microcontroller. The electromagnetic check valve will only open when the gas sensor 805 senses gas. The diversion port 812 is located in the gas outlet leakage control chamber 605, so that the gas in the gas outlet leakage control chamber 605 can flow into the gas recovery connection pipe 404 in one direction through the diversion port 812, while the gas in the gas recovery connection pipe 404 cannot enter the gas outlet leakage control chamber 605 through the diversion port 812.

[0036] like Figure 4 ,Figure 5 , Figure 6 and Figure 9 A vertical displacement control mechanism is provided on one side of the concave support frame 501. The vertical displacement control mechanism includes a movable slot 901 and a vertical rod 902. The movable slot 901 is opened on one side of the concave support frame 501. A movable connecting rod 903 is fixedly connected to one side of the movable plate 504. The movable connecting rod 903 passes through the movable slot 901 and is fixedly connected to an inclined pressure plate 904. The vertical rod 902 is fixed to the bottom of the cylinder bracket 502. A bearing ring 905 is fixedly connected to the bottom of the vertical rod 902. A tension spring 906 is fixedly connected to the top of the bearing ring 905. A lifting bar 907 is slidably connected to the vertical rod 902. The top of the tension spring 906 is fixedly connected to the lifting bar 907 and applies upward pressure to the lifting bar 907. A lifting shaft 908 is fixedly connected to the bottom of one end of the lifting plate 907. The bottom of the lifting shaft 908 extends into the vertical tube 802 and is fixedly connected to the vertical piston 806, so that the vertical piston 806 can move up and down together with the lifting plate 907. A sealing ring is provided at the top of the vertical tube 802 to achieve sliding sealing with the lifting shaft 908. A pressing sealing ring 910 is fixedly connected to the lifting shaft 908. When the lifting shaft 908 drives the vertical piston 806 to move down, the pressing sealing ring 910 will press against the top of the vertical tube 802 to further ensure the sealing of the top of the vertical tube 802. A rotating shaft 909 is rotatably connected to one end of the lifting plate 907, and the inclined surface of the inclined pressure plate 904 abuts against the top of the rotating shaft 909.

[0037] The test chamber 1 is equipped with a lifting mechanism, which includes two threaded shafts 10. The threaded shafts 10 are fixed inside the test chamber 1. A lifting plate 11 is slidably connected to the threaded shafts 10. The lifting plate 11 is located at the bottom of the gas meter 2 and provides support for the gas meter 2. A threaded sleeve 12 is rotatably connected to the bottom of the lifting plate 11. The threaded sleeve 12 is threadedly connected to the threaded shaft 10 to fix the lifting plate 11. By rotating the threaded sleeve 12, the lifting plate 11 can be moved up and down, so that the lifting plate 11 can be moved down without obstructing the removal and replacement of the gas meter 2 from inside the test chamber 1.

[0038] The working principle of the gas meter leakage protection and control device provided by this invention is as follows: During gas meter metering testing, the gas meter 2 to be tested is first placed on the support plate 11 inside the test chamber 1. The height of the support plate 11 is adjusted by rotating the threaded sleeve 12, so that the gas meter inlet 201 and gas meter outlet 202 are aligned with the gas inlet connecting pipe 304 and gas recovery connecting pipe 404 respectively, and the sealing installation is completed. Then, the closing control mechanism is operated, and the control screw 702 is rotated, so that the movable bracket 703 drives the movable arc sleeve 602 to move towards the fixed arc sleeve 601 through the push-pull component 704 until they fit together. The sealing rubber 603 is deformed under pressure, forming a sealed gas inlet leakage control chamber 604 and a gas outlet leakage control chamber 605 on the outside of the connection between the gas meter inlet 201 and the gas meter outlet 202 (e.g., Figure 9 (As shown).

[0039] like Figure 2 , Figure 3 , Figure 7 and Figure 9 First, the bidirectional electric telescopic rod 503 extends, driving the feed push rod 305 and the retraction push rod 405 to move in opposite directions. In the gas feed control mechanism, the feed push rod 305 drives the first feed control plug 306 and the second feed control plug 307 to move, so that the nitrogen feed pipe 303 is closed by the first feed control plug 306, and the gas feed pipe 302 is connected to the gas feed connecting pipe 304. When the external gas delivery container delivers gas, the gas enters the gas meter 2 through the gas feed pipe 302, the gas feed transverse pipe 301, the gas feed connecting pipe 304 and the gas meter inlet 201. Meanwhile, in the gas recovery control mechanism, the recovery push rod 405 drives the first recovery control plug 406 and the second recovery control plug 407 to move, so that the nitrogen recovery pipe 403 is closed, the gas recovery pipe 402 is connected to the gas recovery connection pipe 404, and the gas flowing through the gas meter 2 passes through the gas meter outlet 202, the gas recovery connection pipe 404 and the gas recovery horizontal pipe 401, and is finally recovered to the external gas recovery container through the gas recovery pipe 402.

[0040] If a leak occurs at the connection of the gas meter inlet pipe 201, the leaked gas will accumulate in the gas inlet leakage control chamber 604 and enter the conductor pipe 804 through the interface pipe 801 and the vertical pipe 802; if a leak occurs at the connection of the gas meter outlet pipe 202, the leaked gas will accumulate in the outlet leakage control chamber 605 and enter the conductor pipe 804 through the outlet leakage control chamber 605. When the gas sensor 805 in the conduit 804 detects gas, the external microcontroller receives the signal and immediately controls the bidirectional electric telescopic rod 503 to retract. The electromagnetic check valve in the diversion port 812 opens. At this time, the feed push rod 305 and the recovery push rod 405 are pulled in opposite directions by the movable plate 504. The nitrogen feed control chamber 308 formed by the first feed control plug 306 and the second feed control plug 307 connects the nitrogen feed pipe 303 with the gas feed connection pipe 304, while closing the gas feed pipe 302. Similarly, the nitrogen recovery control chamber 408 connects the nitrogen recovery pipe 403 with the gas recovery connection pipe 404, while closing the gas recovery pipe 402.

[0041] like Figure 5 , Figure 6 and Figure 9 During this process, the movement of the movable plate 504 drives the inclined pressure plate 904 to move synchronously through the movable connecting rod 903. The inclined surface of the inclined pressure plate 904 presses down on the rotating shaft 909, forcing the lifting bar 907 to overcome the elastic force of the tension spring 906 and move down along the vertical rod 902. This causes the vertical piston 806 to move down through the lifting shaft 908, closing the guide pipe 804. This prevents the air inlet leakage control chamber 604 and the air outlet leakage control chamber 605 from being connected through the guide pipe 804. After the vertical piston 806 descends, its top height is lower than the height of the interface pipe 801, and the vertical piston 806 no longer closes the end of the control pipe 803.

[0042] The external gas delivery container stops supplying gas to gas meter 2, and the external nitrogen delivery container starts. Nitrogen enters gas meter 2 through nitrogen inlet pipe 303, nitrogen inlet control chamber 308, gas inlet connecting pipe 304 and gas meter inlet pipe 201, and then is delivered to external nitrogen recovery container through gas meter outlet pipe 202, gas recovery connecting pipe 404, nitrogen recovery control chamber 408 and nitrogen recovery pipe 403. During this process, external nitrogen is sent into the pipeline and gas meter 2 for purging and replacement, pushing the residual gas in gas meter 2 and pipeline system into external nitrogen recovery container to avoid excessive gas residue in gas meter 2 or pipeline system.

[0043] If the leak occurs at the connection point of the gas meter inlet 201, and some gas leaks but is trapped in the inlet leak control chamber 604, the incoming nitrogen will leak into the inlet leak control chamber 604 under the pressure. At this time, the nitrogen will enter the control pipe 803 through the interface pipe 801 and the vertical pipe 802, and squeeze the control piston 810. The control piston 810 will retract into the limiting sleeve 808. At this time, the nitrogen can enter the outlet leak control chamber 605 through the control pipe 803 and the extension end 807. Finally, it enters the gas recovery connection pipe 404 through the diversion pipe 812 with the electromagnetic one-way valve, and together with the original nitrogen in the gas recovery connection pipe 404, it is transported to the external nitrogen recovery container through the nitrogen recovery control chamber 408 and the nitrogen recovery pipe 403. In this process, the gas leaked in the inlet leak control chamber 604 can be purged and replaced.

[0044] If the leak occurs at the connection point of the gas meter outlet 202, and some gas leaks but is trapped in the outlet leak control chamber 605, the incoming nitrogen will leak into the outlet leak control chamber 605 under pressure, pushing the control piston 810. The control piston 810 will move towards the limit ring 811, causing its end to abut against the limit ring 811. This ensures that the gas leaking into the outlet leak control chamber 605 will not flow back into the inlet leak control chamber 604, but instead enters the gas recovery connection pipe 404 through the diversion port 812 with the electromagnetic check valve, and then flows along the gas recovery connection pipe... The nitrogen gas originally present in 404 is transported to the external nitrogen recovery container through the nitrogen recovery control chamber 408 and the nitrogen recovery pipe 403. During this process, the gas leaking into the gas outlet leakage control chamber 605 can be purged and replaced. This ensures that whether the gas leaks into the gas inlet leakage control chamber 604 through the gas meter inlet port 201 or into the gas outlet leakage control chamber 605 through the gas meter outlet port 202, it can be purged and replaced by the unidirectional flow of nitrogen gas when nitrogen is introduced, which greatly reduces the residual gas in the gas outlet leakage control chamber 605 or the gas inlet leakage control chamber 604.

[0045] The control tube 803 is made of a transparent tube. During the process of introducing nitrogen, observe the direction of movement of the control piston 810. If the control piston 810 moves into the limiting sleeve 808, it indicates that the gas pressure in the inlet leakage control chamber 604 is greater than the gas pressure in the outlet leakage control chamber 605, and the gas leak location is located at the connection of the gas meter inlet 201 protected by the inlet leakage control chamber 604. If the control piston 810 moves towards the limiting ring 811, it indicates that the gas pressure in the outlet leakage control chamber 605 is greater than the gas pressure in the inlet leakage control chamber 604, and the leak location is located at the connection of the gas meter outlet 202 protected by the outlet leakage control chamber 605.

[0046] Compared with related technologies, the gas meter leakage protection control device provided by the present invention has the following advantages: This invention, by setting up a linkage between the lateral displacement control mechanism and the gas delivery control mechanism and the gas recovery control mechanism, allows the bidirectional electric telescopic rod 503 to immediately switch the positions of the first delivery control plug 306, the second delivery control plug 307, the first recovery control plug 406, and the second recovery control plug 407 when the gas sensor 805 is triggered. This achieves automatic shut-off of the gas delivery pipe 302 and automatic opening of the nitrogen delivery pipe 303, enabling safe switching of the gas source without manual intervention and significantly improving the safety of the testing process.

[0047] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed invention.

Claims

1. A gas meter metering test leakage protection control device, comprising a test chamber (1), wherein a gas meter (2) is placed inside the test chamber (1), characterized in that, The test chamber (1) is equipped with a gas supply control mechanism, a gas recovery control mechanism and two leakage control devices; The gas supply control mechanism includes a gas supply connecting pipe (304), and the gas supply connecting pipe (304) and the gas meter inlet (201) at the top of the gas meter (2) are fixedly installed. The gas recovery control mechanism includes a gas recovery connecting pipe (404), and the gas recovery connecting pipe (404) and the gas meter outlet (202) at the top of the gas meter (2) are fixedly installed. Both gas leakage control devices include a fixed arc sleeve (601) and a movable arc sleeve (602). The fixed arc sleeve (601) and the movable arc sleeve (602) cover the connection of the gas meter inlet pipe (201) and the gas meter outlet pipe (202) from both sides respectively, and form an inlet gas leakage control cavity (604) on the outside of the gas meter inlet pipe (201) and an outlet gas leakage control cavity (605) on the outside of the connection with the gas meter outlet pipe (202).

2. A detection and conduction switching control device is installed between the two leakage control devices, and the devices are connected to each other to realize the purging and replacement of leaked gas.

3. The gas meter leakage protection control device for gas metering and testing according to claim 1, characterized in that, The gas delivery control mechanism also includes a gas delivery transverse pipe (301), a gas delivery pipe (302) fixed to the end of the gas delivery transverse pipe (301) and bent upward, a nitrogen delivery pipe (303) fixed to the top of the gas delivery transverse pipe (301), and a gas delivery connecting pipe (304) fixed to the bottom of the gas delivery transverse pipe (301). A gas delivery push rod (305) is provided at one end of the gas delivery transverse tube (301). One end of the gas delivery push rod (305) extends into the gas delivery transverse tube (301). A first delivery control plug (306) and a second delivery control plug (307) are fixedly connected to the outer surface of the delivery push rod (305) and located inside the gas delivery transverse tube (301). A nitrogen delivery control chamber (308) is formed between the first delivery control plug (306) and the second delivery control plug (307).

4. A gas meter leakage protection control device for metering and testing according to claim 2, characterized in that, The gas recovery control mechanism also includes a gas recovery horizontal pipe (401), a gas recovery pipe (402) fixed to the end of the gas recovery horizontal pipe (401) and bent upward, a nitrogen recovery pipe (403) fixed to the top of the gas recovery horizontal pipe (401), and a gas recovery connecting pipe (404) fixed to the bottom of the gas recovery horizontal pipe (401). A recovery push rod (405) is provided at one end of the gas recovery transverse tube (401). One end of the recovery push rod (405) extends into the gas recovery transverse tube (401). A first recovery control plug (406) and a second recovery control plug (407) are fixedly connected to the outer surface of the recovery push rod (405) and located inside the gas recovery transverse tube (401). A nitrogen recovery control chamber (408) is formed between the first recovery control plug (406) and the second recovery control plug (407).

5. A gas meter leakage protection control device for gas metering and testing according to claim 3, characterized in that, A lateral displacement control mechanism is provided inside the test box (1) and above the gas meter (2). The lateral displacement control mechanism includes a concave support frame (501), a cylinder bracket (502) is fixedly installed on the concave support frame (501), a bidirectional electric telescopic rod (503) is fixedly installed on the cylinder bracket (502), and movable plates (504) are fixedly connected to both ends of the bidirectional electric telescopic rod (503). The two movable plates (504) are fixedly connected to the feed push rod (305) and the retraction push rod (405) respectively, and can drive the feed push rod (305) and the retraction push rod (405) to move in opposite directions.

6. A gas meter leakage protection control device for gas metering and testing according to claim 1, characterized in that, The top and bottom of the fixed arc sleeve (601) and the movable arc sleeve (602) on opposite sides are fixedly connected with sealing rubber (603). A second connecting bracket (606) is fixedly connected to one side of the fixed arc sleeve (601). The second connecting bracket (606) is fixedly connected to the inner wall of the test box (1) to provide fixation and support for the fixed arc sleeve (601).

7. A gas meter leakage protection control device for gas metering and testing according to claim 5, characterized in that, Both of the two leakage control devices are provided with a closing control mechanism on the side that is far apart from each other. The closing control mechanism includes a fixed bracket (701) fixed to the inner wall of the test chamber (1). A control screw (702) is threaded on the fixed bracket (701). A movable bracket (703) is rotatably connected to one end of the control screw (702). Two push-pull parts (704) are fixedly connected to one side of the movable bracket (703). The ends of the two push-pull parts (704) are fixedly connected to the movable arc sleeve (602).

8. A gas meter leakage protection control device for gas metering and testing according to claim 6, characterized in that, Two guide shafts (705) are fixedly connected to one side of the fixed bracket (701), and the guide shafts (705) and the movable bracket (703) are slidably connected.

9. A gas meter leakage protection control device for gas metering and testing according to claim 4, characterized in that, The detection and conduction switching control device includes an interface pipe (801), which is fixedly connected to a fixed arc sleeve (601) and communicates with the air inlet leakage control chamber (604). One end of the interface pipe (801) is fixedly connected to a vertical pipe (802), and one side of the vertical pipe (802) is fixedly connected to a control pipe (803) and a conduction pipe (804). The control pipe (803) and the conduction pipe (804) are both fixedly connected to another fixed arc sleeve (601) and communicate with the air outlet leakage control chamber (605). A gas sensor (805) is installed on the conduction pipe (804). A vertical piston (806) that can move up and down is provided inside the vertical tube (802). The vertical piston (806) is initially located at the top and can close the open end of the control tube (803).

10. A gas meter leakage protection control device for gas metering and testing according to claim 8, characterized in that, The control tube (803) is provided with an extension end (807), the radius of the extension end (807) is larger than the radius of the control tube (803), and the inner wall of the extension end (807) is fixedly connected to a limiting sleeve (808) through a connecting shaft. One end of the limiting sleeve (808) adopts an open design and the other end adopts an open hole design. A reset spring (809) is fixedly connected inside the limiting sleeve (808), and a control piston (810) is fixedly connected to one end of the reset spring (809). The control piston (810) extends into the control tube (803), and a limiting ring (811) is fixedly connected inside the control tube (803) and at the end of the control piston (810). A diversion port (812) with an electromagnetic one-way valve is fixedly installed on the gas recovery connecting pipe (404).

11. A gas meter leakage protection control device for gas metering and testing according to claim 9, characterized in that, A vertical displacement control mechanism is provided on one side of the concave support frame (501). The vertical displacement control mechanism includes a movable slot (901) and a vertical rod (902). The movable slot (901) is opened on one side of the concave support frame (501). A movable connecting rod (903) is fixedly connected to one side of the movable plate (504). The movable connecting rod (903) passes through the movable slot (901) and is fixedly connected to the inclined pressure plate (904). The vertical rod (902) is fixed to the bottom of the cylinder bracket (502). A bearing ring (905) is fixedly connected to the bottom of the vertical rod (902). A tension spring (906) is fixedly connected to the top of the bearing ring (905). A lifting bar (907) is slidably connected to the vertical rod (902). The top of the tension spring (906) and the lifting bar (907) are fixedly connected. A lifting shaft (908) is fixedly connected to the bottom of one end of the lifting bar (907). The bottom of the lifting shaft (908) extends into the vertical tube (802) and is fixedly connected to the vertical piston (806). A pressure sealing ring (910) is fixedly connected to the lifting shaft (908). A rotating shaft (909) is rotatably connected to one end of the lifting bar (907). The inclined surface of the inclined pressure plate (904) abuts against the top of the rotating shaft (909).

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