Device for detecting gas tightness of gas meter

Abstract

The utility model relates to a device for detecting the airtightness of a gas meter. The device comprises a sealing box, an elastic film, a connecting part, a detecting part and an alarm. According to the technical scheme, the sealing box and the elastic film are arranged, so that when the gas meter in the sealing box leaks gas due to insufficient gas tightness, the elastic film can expand towards the outside of the sealing box under the action of gas pressure, and therefore the detection part can be pushed to slide in the direction away from the sealing box; when the gas meter leaks, the alarm is powered on and gives an alarm to remind a householder of timely processing the gas meter with gas leakage when the gas meter leaks.

Description

Technical Field

[0001] This utility model relates to the field of gas meter technology, and specifically to a device for testing the air tightness of a gas meter. Background Technology

[0002] A gas meter is an instrument installed on a gas pipeline to count gas flow. When gas passes through, the amount of gas is converted into a series of numbers and symbols for display, including decimal points, tons, and cubic meters. To prevent gas leakage into the air during use, the gas meters undergo an airtightness test at the factory before leaving the facility. Only gas meters that pass the airtightness test are put into use. However, during use, the gas meter's airtightness may be compromised due to internal component damage or improper daily maintenance, leading to gas leaks. Minor leaks are often difficult to detect, and maintenance personnel only visit periodically for inspection and repair. Currently, it is impossible to detect and address airtightness issues in gas meters in real time. Utility Model Content

[0003] In view of this, the purpose of this utility model is to provide a gas meter airtightness detection device to solve the technical problem that the existing technology cannot detect and deal with the airtightness problem of gas meters in use in real time.

[0004] This utility model is achieved through the following technical solution:

[0005] A gas meter airtightness testing device includes a sealed box, an elastic diaphragm, a connecting part, a detection part, and an alarm. The inner cavity of the sealed box is used to accommodate the gas meter and is in a sealed state. A first through hole is provided on the side wall of the sealed box. The elastic diaphragm is fixed to the sealed box and seals the first through hole. The connecting part is fixedly connected to the sealed box. The detection part is slidably connected to the connecting part in a manner that allows it to slide along the axis of the first through hole. The detection part abuts against the elastic diaphragm. The alarm is used to turn on the power and sound an alarm after the detection part slides a certain distance away from the sealed box.

[0006] Furthermore, the detection unit includes a probe and a first sliding part. The probe abuts against the elastic membrane. The first sliding part is connected to the connecting part in a manner that allows it to slide towards or away from the sealed box. One end of the first sliding part is connected to the probe, and the other end of the first sliding part opposite to the probe is connected to a first electrode. A second electrode is fixed on the connecting part, and the second electrode is located on the side of the first sliding part facing away from the sealed box. The negative terminal of the alarm is electrically connected to the negative terminal of the power supply, the first electrode is electrically connected to the positive terminal of the alarm, and the second electrode is electrically connected to the positive terminal of the power supply.

[0007] Furthermore, it also includes a puncture part and an exhaust pipe. The puncture part is slidably connected to the connecting part in a manner that allows it to slide along the axis of the first through hole. The puncture part is used to puncture the elastic membrane after sliding a certain distance toward the first through hole. One end of the exhaust pipe is fixedly connected to the connecting part, and the other end extends to the outside. The connecting part is used to guide the gas discharged through the first through hole into the exhaust pipe.

[0008] Furthermore, the puncture portion includes a second sliding portion and a puncture cone. The second sliding portion is slidably connected to the connecting portion in a manner that allows it to slide along the axial direction of the first through hole. The puncture cone is fixed on the second sliding portion, and the tip of the puncture cone faces the first through hole.

[0009] Furthermore, the connecting part includes a cylindrical body and a cover plate. The axis of the cylindrical body is parallel to the axis of the first through hole. One end of the cylindrical body is fixedly connected to the sealing box. The cover plate is fixed to the other end of the cylindrical body and closes the end of the cylindrical body. The first through hole is located inside the inner cavity of the cylindrical body. A first strip-shaped hole is formed on the upper side wall of the cylindrical body. The first strip-shaped hole is arranged parallel to the axis of the first through hole. The first sliding part includes a first sliding block and a first limiting plate. The first sliding block is slidably fitted in the first strip-shaped hole groove. The first limiting plate is fixed to the upper end of the first sliding block. The lower side of the first limiting plate abuts against the upper side of the cylindrical body.

[0010] Furthermore, a second strip-shaped hole is formed on the upper side wall of the cylinder, and the second strip-shaped hole is arranged parallel to the axis of the first through hole; the second sliding part includes a second sliding block and a second limiting plate, the second sliding block is slidably engaged in the second strip-shaped hole groove, the second limiting plate is fixed to the upper end of the second sliding block, and the lower side of the second limiting plate abuts against the upper side of the cylinder.

[0011] Furthermore, one end of the exhaust pipe is fixedly connected to the cover plate, and the cavity of the exhaust pipe communicates with the inner cavity of the cylinder. The connecting part further includes a first flexible sleeve and a second flexible sleeve. Both ends of the first flexible sleeve are open. The edge of the opening at one end of the first flexible sleeve is fixedly connected to the upper surface of the cylinder and surrounds the first strip hole. The opening at the other end of the first flexible sleeve cooperates with the first sliding block. The edge of the opening at the other end of the first flexible sleeve surrounds the first sliding block and is fixedly connected to the sliding block. Both the upper and lower ends of the second flexible sleeve are open. The edge of the opening at the lower end of the second flexible sleeve is fixedly connected to the upper surface of the cylinder and surrounds the second strip hole. The opening at the other end of the second flexible sleeve cooperates with the second sliding block. The edge of the opening at the other end of the second flexible sleeve surrounds the second sliding block and is fixedly connected to the sliding block.

[0012] Furthermore, a second sliding rod is connected inside the second strip-shaped hole along the axis of the cylinder. The second sliding rod passes through the second sliding block and is slidably connected to the second sliding block. A second spring is sleeved on the second sliding rod. The two ends of the second spring are respectively fixed to the end of the second sliding rod near the sealing box and the side of the second sliding block facing the sealing box.

[0013] Furthermore, a first sliding rod is connected inside the first strip-shaped hole along the axis of the cylinder. The first sliding rod passes through the first sliding block and is slidably connected to the first sliding block. A first spring is sleeved on the first sliding rod, and the two ends of the first spring are respectively fixed to the end of the first sliding rod away from the sealing box and the side of the first sliding block away from the sealing box.

[0014] Furthermore, the elastic membrane is detachably connected to the sealed box.

[0015] The beneficial effects of this utility model are as follows:

[0016] This gas meter airtightness testing device consists of a sealed box, an elastic diaphragm, a detection unit, and an alarm. When the gas meter inside the sealed box leaks gas due to insufficient airtightness, the elastic diaphragm expands outward under air pressure, pushing the detection unit to slide away from the sealed box. After the detection unit slides a certain distance away from the sealed box, the alarm will activate and sound an alarm to remind the homeowner to promptly address the gas meter leak.

[0017] Other advantages, objectives, and features of this invention will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art from the following examination and study, or may be learned from practice of this invention. The objectives and other advantages of this invention can be realized and obtained through the following description. Attached Figure Description

[0018] Figure 1 This is an indication of the existing gas supply.

[0019] Figure 2 This is a schematic diagram of the gas meter airtightness testing device of this utility model;

[0020] Figure 3 This is a plan view of the mounting part, detection part, and puncture part of this utility model;

[0021] Figure 4 for Figure 3 A perspective view of section AA in the middle;

[0022] Figure 5 for Figure 3 A perspective view of the BB section in the middle;

[0023] Figure 6 This is a frontal view of the housing and mounting section of this utility model;

[0024] Figure 7 for Figure 6 A perspective view of the CC section in the image;

[0025] Figure 8 This is the circuit diagram of the alarm device of this utility model.

[0026] In the diagram: 1. Sealed box; 2. Elastic membrane; 3. Connecting part; 31. Cylinder; 32. Cover plate; 4. Alarm; 5. Probe; 71. First electrode; 72. Second electrode; 8. Puncture cone; 91. First through hole; 92. First strip hole; 93. Second strip hole; 101. First sliding block; 102. Second sliding block; 111. First flexible sleeve; 112. Second flexible sleeve; 121. First spring; 122. Second spring; 131. First limiting plate; 132. Second limiting plate; 141. First sliding rod; 142. Second sliding rod; 15. Exhaust pipe; 16. Box body; 17. Cover body; 18. Sealing strip; 19. Sealing groove; 20. Pipe groove; 21. Fixing frame; 22. Air pipe; 23. Power supply; Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0028] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0029] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0030] In the above description of this utility model, it should be noted that the terms "one side," "the other side," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the utility model product is in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first," "second," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0031] Furthermore, terms such as "identical" do not imply that components must be absolutely identical; minor differences are permissible. The term "perpendicular" simply means that the positional relationship between components is more perpendicular than "parallel," not that the structure must be perfectly perpendicular; a slight tilt is acceptable.

[0032] To facilitate the description of the gas meter airtightness testing device of this utility model, the structure of the gas meter will be briefly described first: as follows: Figure 1 As shown, this is an existing gas meter. The gas meter is equipped with an inlet pipe and an outlet pipe. The inlet pipe is used to supply gas into the gas meter, and the outlet pipe is used to supply gas flowing through the gas meter to the gas-using equipment.

[0033] Please see Figure 2-7 This utility model provides a technical solution: a gas meter airtightness testing device, including a sealed box 1, an elastic membrane 2, a connecting part 3, a detection part, and an alarm 4. The elastic membrane 2 can be an elastic membrane made of latex material, and the alarm 4 can be a YS-01A audible and visual alarm. The inner cavity of the sealed box 1 is used to accommodate the gas meter, and the inner cavity of the sealed box 1 is in a sealed state. A first through hole 91 is provided on the side wall of the sealed box 1. The elastic membrane 2 is fixed on the sealed box 1 and seals the first through hole 91. The connecting part 3 is fixedly connected to the sealed box 1. The detection part is slidably connected to the connecting part 3 in a manner that allows it to slide along the axis of the first through hole 91. The detection part abuts against the elastic membrane 2. The alarm 4 is used to connect the power supply 23 and sound an alarm after the detection part slides a certain distance away from the sealed box 1.

[0034] After the gas meter air tightness testing device of this utility model is installed at the location of the gas meter and the gas meter is installed on the gas meter air tightness testing device of this utility model, the gas meter is located in the inner cavity of the sealing box 1, the inner cavity of the sealing box 1 is in a sealed state, the detection part abuts against the elastic membrane 2, and the alarm 4 is in a non-alarm state.

[0035] When there is no gas leak in the gas meter, the air pressure inside the sealed box 1 is the same as the external air pressure, and the sealing membrane will not expand outward from the sealed box 1. When the gas meter inside the sealed box 1 leaks gas due to insufficient air tightness, as the gas leaking into the sealed box 1 increases, the air pressure inside the sealed box 1 will gradually rise. The elastic membrane 2 will expand outward from the sealed box 1 under the action of air pressure, thereby pushing the detection part to slide away from the sealed box 1 along the axis of the first through hole 91. After the detection part slides away from the sealed box 1 a certain distance, the alarm 4 will connect the power supply 23 and sound an alarm to remind the homeowner that the gas meter has leaked. The gas meter air tightness detection device of this invention can detect the gas meter in real time. After the gas meter leaks, the gas meter air tightness detection device of this invention can promptly remind the homeowner so that the homeowner can deal with the leaking gas meter in a timely manner.

[0036] In this embodiment, the sealed box 1 includes a box body 16 and a cover 17. The opening of the box body 16 faces the same direction as the front of the gas meter. A sealing groove 19 is formed inward on the end face of the box body 16 corresponding to the opening. The sealing groove 19 surrounds the opening. The cover 17 is placed on the box body 16, closing the opening of the box body 16. A sealing strip 18 is fixed on the cover 17 at a position corresponding to the sealing groove 19. The sealing strip 18 can be a rubber sealing strip, which is inserted into and cooperates with the sealing groove 19. After the cover 17 is placed on the box body 16, it can be bound and fixed together by wrapping tape around the box body 16 and the cover 17, so that the cover 17 is not easy to fall off the box body 16. After the cover 17 is placed on the housing 16, the sealing strip 18 can seal the gap between the housing 16 and the cover 17, making it less likely for gas to leak. When the gas meter needs to be inspected, the tape can be peeled off the housing 16 and the cover 17, and then the cover 17 can be removed from the housing 16 to facilitate the inspection of the gas meter by maintenance personnel.

[0037] The upper sides of the housing 16 and the cover 17 are provided with pipe grooves 20 that match the positions of the gas pipes 22 (inlet pipe 22 and outlet pipe 22). The pipe grooves 20 are provided with sealing strips 18. With this structure, when the housing 16 and the cover 17 are closed, the inlet pipe 22 and the outlet pipe 22 can pass smoothly through the sealed box 1, and the sealing state of the sealed box 1 will not be affected by the setting of the pipe grooves 20. Thus, the gas meter can be used normally after being installed in the gas meter airtightness testing device of this utility model.

[0038] In this embodiment: the detection unit includes a probe 5 and a first sliding part. The probe 5 abuts against the elastic membrane 2. The first sliding part is connected to the connecting part 3 in a manner that allows it to slide towards or away from the sealed box 1. One end of the first sliding part is connected to the probe 5, and the other end of the first sliding part opposite to the first end is connected to a first electrode 71. A second electrode 72 is fixed on the connecting part 3. The second electrode 72 is located on the side of the first sliding part away from the sealed box 1. The negative terminal of the alarm 4 is electrically connected to the negative terminal of the power supply 23. The first electrode 71 is electrically connected to the positive terminal of the alarm 4, and the second electrode 72 is electrically connected to the positive terminal of the power supply 23.

[0039] When the gas meter leaks due to insufficient air tightness, the gas pressure inside the sealed box 1 increases. The elastic diaphragm 2 is squeezed by the internal pressure of the sealed box 1 and deforms and expands outward, thereby pushing the probe 5, which is in contact with it, to move. This pushes the first sliding part to slide away from the sealed box 1 along the axis of the first through hole 91, thereby driving the first electrode 71 to move towards the second electrode 72. When the first electrode 71 and the second electrode 72 come into contact, the first alarm 4 turns on the power 23 and sounds an alarm. With this structure, the alarm 4 can turn on the power 23 and sound an alarm after the detection part slides a certain distance away from the sealed box 1.

[0040] In this embodiment, a puncture part and an exhaust pipe 15 are also included. The puncture part is slidably connected to the connecting part 3 in a manner that allows it to slide along the axial direction of the first through hole 91. The puncture part is used to puncture the elastic membrane 2 after sliding a certain distance toward the first through hole 91. One end of the exhaust pipe 15 is fixedly connected to the connecting part 3, and the other end extends to the outside. The connecting part 3 is used to guide the gas discharged through the first through hole 91 into the exhaust pipe 15.

[0041] When the gas meter triggers an alarm due to insufficient gas tightness, the homeowner can push the puncture part towards the first through hole 91 to puncture the elastic membrane 2. At this time, the gas in the sealed box 1 will overflow from the puncture position to the connecting part 3, and then be introduced into the exhaust pipe 15 through the connecting part 3, so that the gas in the sealed box 1 can be discharged along the exhaust pipe 15. With this structure, the gas in the sealed box 1 can be discharged to the outside. When the staff comes to inspect, it can reduce the amount of gas inhaled by the staff and reduce the harm to the staff.

[0042] In this embodiment: the puncture part includes a second sliding part and a puncture cone 8. The second sliding part is slidably connected to the connecting part 3 in such a way that it can slide along the axis of the first through hole 91. The puncture cone 8 is fixed on the second sliding part, and the tip of the puncture cone 8 faces the first through hole 91.

[0043] After the alarm 4 sounds, the second sliding part is pushed in the direction toward the first through hole 91, thereby pushing the puncture cone 8 toward the first through hole 91 until the puncture cone 8 contacts the elastic membrane 2 and punctures the elastic membrane 2. With this structure, the puncture part can be slidably connected to the connecting part 3 in a manner that allows it to slide along the axis of the first through hole 91, and the puncture part can puncture the elastic membrane 2 after sliding a certain distance toward the first through hole 91.

[0044] In this embodiment: the connecting part 3 includes a cylindrical body 31 and a cover plate 32. The axis of the cylindrical body 31 is parallel to the axis of the first through hole 91. One end of the cylindrical body 31 is fixedly connected to the sealing box 1. The cover plate 32 is fixed to the other end of the cylindrical body 31 and closes the end of the cylindrical body 31. The first through hole 91 is located in the inner cavity of the cylindrical body 31. A first strip hole 92 is formed on the upper side wall of the cylindrical body 31. The first strip hole 92 is arranged parallel to the axis of the first through hole 91. The first sliding part includes a first sliding block 101 and a first limiting plate 131. The first sliding block 101 is slidably fitted in the groove of the first strip hole 92. The first limiting plate 131 is fixed to the upper end of the first sliding block 101. The lower side of the first limiting plate 131 abuts against the upper side of the cylindrical body 31.

[0045] The first strip hole 92 is arranged parallel to the axis of the first through hole 91, and the first sliding block 101 is fitted into the groove of the first strip hole 92, so that the first sliding block 101 can slide in the first strip hole 92. Since the first limiting plate 131 is fixed to the upper end of the first sliding block 101, and the lower side of the first limiting plate 131 abuts against the upper side of the cylinder 31, the first sliding block 101 cannot fall off the first strip hole 92 during the sliding process in the first strip hole 92, so that the first sliding block 101 can slide along the axis of the first through hole 91. With this structure, the first sliding part can be connected to the connecting part 3 in a way that can slide towards or away from the sealing box 1.

[0046] In this embodiment: a second strip-shaped hole 93 is formed on the upper wall of the cylinder 31, and the second strip-shaped hole 93 is arranged parallel to the axis of the first through hole 91; the second sliding part includes a second sliding block 102 and a second limiting plate 132, the second sliding block 102 is slidably engaged in the groove of the second strip-shaped hole 93, the second limiting plate 132 is fixed to the upper end of the second sliding block 102, and the lower side of the second limiting plate 132 abuts against the upper side of the cylinder 31.

[0047] The second strip-shaped hole 93 is arranged parallel to the axis of the first through hole 91, and the second sliding block 102 is fitted into the groove of the second strip-shaped hole 93, so that the second sliding block 102 can slide in the second strip-shaped hole 93. Since the second limiting plate 132 is fixed to the upper end of the second sliding block 102, and the lower side of the second limiting plate 132 abuts against the upper side of the cylinder 31, the second sliding block 102 cannot fall off the second strip-shaped hole 93 during the sliding process in the second strip-shaped hole 93, so that the second sliding block 102 can slide along the axis of the first through hole 91. With this structure, the second sliding part can be connected to the connecting part 3 in a way that can slide towards or away from the sealing box 1.

[0048] In this embodiment: one end of the exhaust pipe 15 is fixedly connected to the cover plate 32, the cavity of the exhaust pipe 15 communicates with the inner cavity of the cylinder 31, and the connecting part 3 further includes a first flexible sleeve 111 and a second flexible sleeve 112. The first flexible sleeve 111 and the second flexible sleeve 112 can be flexible sleeves made of latex material. Both ends of the first flexible sleeve 111 are open. The edge of the opening at one end of the first flexible sleeve 111 is fixedly connected to the upper surface of the cylinder 31 and surrounds the first strip hole 92. The opening at the other end of the first flexible sleeve 111 is connected to the first sliding block 10. In a coordinated manner, the opening edge of the other end of the first flexible sleeve 111 surrounds and is fixedly connected to the first sliding block 101; both the upper and lower ends of the second flexible sleeve 112 are open, the edge of the lower opening of the second flexible sleeve 112 is fixedly connected to the upper surface of the cylinder 31 and surrounds the second strip hole 93, the opening at the other end of the second flexible sleeve 112 cooperates with the second sliding block 102, and the opening edge of the other end of the second flexible sleeve 112 surrounds and is fixedly connected to the second sliding block 102.

[0049] By setting the first flexible sleeve 111 and the second flexible sleeve 112, the first strip hole 92 and the second strip hole 93 can be blocked, so that during the sliding of the first sliding block 101 and the second sliding block 102, the gas overflowing from the sealed box 1 into the mounting part will not overflow from the first strip hole 92 and the second strip hole 93 but will be discharged to the outside through the exhaust pipe 15, preventing the gas from leaking into the room. In addition, since the first flexible sleeve 111 and the second flexible sleeve 112 are made of soft material, they will not restrict the sliding of the first sliding block 101 and the second sliding block 102 in the first strip hole 92 and the second strip hole 93.

[0050] In this embodiment: a second sliding rod 142 is connected inside the second strip hole 93 along the axis of the cylinder 31. The second sliding rod 142 passes through the second sliding block 102 and is slidably connected to the second sliding block 102. A second spring 122 is sleeved on the second sliding rod 142. The two ends of the second spring 122 are respectively fixed to one end of the second sliding rod 142 near the sealing box 1 and one side of the second sliding block 102 facing the sealing box 1.

[0051] When the second sliding block 102 is pushed to slide toward the first through hole 91, the second sliding block 102 squeezes the second spring 122. When the puncture cone 8 punctures the elastic membrane 2, the push on the second sliding block 102 is released, and the second spring 122 drives the puncture cone 8 to reset and thus detach from the elastic membrane 2. With this structure, after the elastic membrane 2 is punctured by the puncture cone 8, the possibility that the damaged position of the elastic membrane 2 is covered by the cone of the puncture cone 8 can be reduced, thereby reducing the possibility that the puncture cone 8 will block the damaged position of the elastic membrane 2, making it easier for the gas in the sealed box 1 to pass through the damaged position of the elastic membrane 2.

[0052] In this embodiment: a first sliding rod 141 is connected inside the first strip hole 92 along the axis of the cylinder 31. The first sliding rod 141 passes through the first sliding block 101 and is slidably connected to the first sliding block 101. A first spring 121 is sleeved on the first sliding rod 141. The two ends of the first spring 121 are respectively fixed to the end of the first sliding rod 141 away from the sealing box 1 and the side of the first sliding block 101 away from the sealing box 1.

[0053] When the elastic membrane 2 pushes the probe 5 to move away from the sealed box 1, the first sliding block 101 moves with the probe 5 and squeezes the first spring 121. After the piercing cone 8 punctures the elastic membrane 2, the gas in the sealed box 1 is discharged, so that the damaged elastic membrane 2 is no longer in an expanded state, thus the elastic membrane 2 no longer resists the probe 5. The first spring 121 then pushes the first sliding block 101 to drive the probe 5 to reset, which also drives the first electrode 71 to move away from the second electrode 72, so that the first electrode 71 is separated from the second electrode 72. With this structure, after the homeowner punctures the elastic membrane 2, the alarm 4 can automatically stop emitting the alarm, which makes it more convenient to stop the alarm 4.

[0054] In this embodiment, the elastic membrane 2 is detachably connected to the sealed box 1.

[0055] After the staff inspects and repairs the gas meter, the elastic diaphragm 2 can be disassembled and replaced. With this structure, the gas meter airtightness testing device of this utility model can be reused.

[0056] In this embodiment, the inner wall of the sealing box 1 is provided with a groove at the location of the first through hole 91. The groove is frame-shaped and surrounds the first through hole 91. A sealing gasket that mates with the groove is provided in the groove. A fixing frame 21 is connected to the groove. One end of the fixing frame 21 abuts against the sealing gasket in the groove, and the other end protrudes from the groove. The fixing frame 21 mates with the elastic membrane 2, and the inner circumferential surface of the part of the fixing frame 2 protruding from the groove is fixed to the edge of the elastic membrane 2. By fastening the fixing frame 21 with the elastic membrane 2 in the groove, the first through hole 91 can be blocked. With this structure, the elastic membrane 2 can be detachably connected to the first through hole 91.

[0057] Specifically, a sealing strip 18 is provided in the groove so that when the fixing frame 21 is fastened to the groove, the connection position between the fixing frame 21 and the groove will not affect the overall sealing performance of the sealing box 1.

[0058] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this utility model without departing from the spirit and scope of the technical solutions of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A device for testing the air tightness of a gas meter, characterized in that: The device includes a sealed box (1), an elastic membrane (2), a connecting part (3), a detection part, and an alarm (4). The inner cavity of the sealed box (1) is used to accommodate a gas meter. The inner cavity of the sealed box (1) is in a sealed state. A first through hole (91) is provided on the side wall of the sealed box (1). The elastic membrane (2) is fixed on the sealed box (1) and seals the first through hole (91). The connecting part (3) is fixedly connected to the sealed box (1). The detection part is slidably connected to the connecting part (3) in a manner that allows it to slide along the axis of the first through hole (91). The detection part abuts against the elastic membrane (2). The alarm (4) is used to turn on the power (23) and sound an alarm after the detection part slides a certain distance away from the sealed box (1).

2. The gas meter airtightness testing device according to claim 1, characterized in that: The detection unit includes a probe (5) and a first sliding part. The probe (5) abuts against the elastic membrane (2). The first sliding part is connected to the connecting part (3) in a way that it can slide towards or away from the sealed box (1). One end of the first sliding part is connected to the probe (5). The other end of the first sliding part opposite to the first end is connected to a first electrode (71). A second electrode (72) is fixed on the connecting part (3). The second electrode (72) is located on the side of the first sliding part away from the sealed box (1). The negative terminal of the alarm (4) is electrically connected to the negative terminal of the power supply (23). The first electrode (71) is electrically connected to the positive terminal of the alarm (4). The second electrode (72) is electrically connected to the positive terminal of the power supply (23).

3. The gas meter airtightness testing device according to claim 2, characterized in that: It also includes a puncture part and an exhaust pipe (15). The puncture part is slidably connected to the connecting part (3) in such a way that it can slide along the axis of the first through hole (91). The puncture part is used to puncture the elastic membrane (2) after sliding a certain distance toward the first through hole (91). One end of the exhaust pipe (15) is fixedly connected to the connecting part (3) and the other end extends to the outside. The connecting part (3) is used to guide the gas discharged through the first through hole (91) into the exhaust pipe (15).

4. The gas meter airtightness testing device according to claim 3, characterized in that: The puncture portion includes a second sliding portion and a puncture cone (8). The second sliding portion is slidably connected to the connecting portion (3) in a manner that allows it to slide along the axis of the first through hole (91). The puncture cone (8) is fixed on the second sliding portion, and the tip of the puncture cone (8) faces the first through hole (91).

5. The gas meter airtightness testing device according to claim 4, characterized in that: The connecting part (3) includes a cylindrical body (31) and a cover plate (32). The axis of the cylindrical body (31) is parallel to the axis of the first through hole (91). One end of the cylindrical body (31) is fixedly connected to the sealing box (1). The cover plate (32) is fixed to the other end of the cylindrical body (31) and closes the end of the cylindrical body (31). The first through hole (91) is located inside the cavity of the cylindrical body (31). A groove is formed on the upper wall of the cylindrical body (31). The first strip hole (92) is arranged parallel to the axis of the first through hole (91); the first sliding part includes a first sliding block (101) and a first limiting plate (131), the first sliding block (101) is slidably fitted in the groove of the first strip hole (92), the first limiting plate (131) is fixed to the upper end of the first sliding block (101), and the lower side of the first limiting plate (131) abuts against the upper side of the cylinder (31).

6. The gas meter airtightness testing device according to claim 5, characterized in that: A second strip-shaped hole (93) is formed on the upper wall of the cylinder (31), and the second strip-shaped hole (93) is arranged parallel to the axis of the first through hole (91); the second sliding part includes a second sliding block (102) and a second limiting plate (132), the second sliding block (102) is slidably fitted in the groove of the second strip-shaped hole (93), the second limiting plate (132) is fixed to the upper end of the second sliding block (102), and the lower side of the second limiting plate (132) abuts against the upper side of the cylinder (31).

7. The gas meter airtightness testing device according to claim 6, characterized in that: One end of the exhaust pipe (15) is fixedly connected to the cover plate (32), and the cavity of the exhaust pipe (15) communicates with the inner cavity of the cylinder (31). The connecting part (3) further includes a first flexible sleeve (111) and a second flexible sleeve (112). Both ends of the first flexible sleeve (111) are open. The edge of the opening at one end of the first flexible sleeve (111) is fixedly connected to the upper surface of the cylinder (31) and surrounds the first strip hole (92). The opening at the other end of the first flexible sleeve (111) cooperates with the first sliding block (101). The first flexible sleeve (111) The opening edge at the other end surrounds and is fixedly connected to the first sliding block (101); both the upper and lower ends of the second flexible sleeve (112) are open, the edge of the lower opening of the second flexible sleeve (112) is fixedly connected to the upper surface of the cylinder (31) and surrounds the second strip hole (93), the opening at the other end of the second flexible sleeve (112) cooperates with the second sliding block (102), and the opening edge at the other end of the second flexible sleeve (112) surrounds and is fixedly connected to the second sliding block (102).

8. The gas meter airtightness testing device according to claim 6, characterized in that: A second sliding rod (142) is connected inside the second strip hole (93) along the axis of the cylinder (31). The second sliding rod (142) passes through the second sliding block (102) and is slidably connected to the second sliding block (102). A second spring (122) is sleeved on the second sliding rod (142). The two ends of the second spring (122) are respectively fixed to one end of the second sliding rod (142) near the sealing box (1) and one side of the second sliding block (102) facing the sealing box (1).

9. The gas meter airtightness testing device according to claim 5, characterized in that: A first sliding rod (141) is connected inside the first strip hole (92) along the axis of the cylinder (31). The first sliding rod (141) passes through the first sliding block (101) and is slidably connected to the first sliding block (101). A first spring (121) is sleeved on the first sliding rod (141). The two ends of the first spring (121) are respectively fixed to the end of the first sliding rod (141) away from the sealing box (1) and the side of the first sliding block (101) away from the sealing box (1).

10. The gas meter airtightness testing device according to claim 1, characterized in that: The elastic membrane (2) is detachably connected to the sealed box (1).

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