Gas meter with anti-backflow function

Abstract

The utility model discloses a gas meter with anti -back flow function, the utility model relates to gas meter technical field. This gas meter with anti -back flow function includes the shell, the inside of shell is provided with the monitoring mechanism for monitoring gas flow, the monitoring mechanism includes: flow measurement subassembly, and the gas flow is calculated through the time required for ultrasonic wave propagation in fluid, anti -back flow subassembly, including the connecting pipe of setting in the shell inside, the inside fixed mounting of connecting pipe has the draft tube, the center of draft tube inserts and installs the movable column, and the open hole of annular distribution is designed to the pipe top, and the open hole position of this open hole and sealing washer is mutually staggered, and even if there is the extremely small adhesion gap, and the open hole structure of staggered open hole structure can further block the gas backflow channel, and the close adhesion of sealing washer and connecting pipe arc surface, and the poor problem of the tightness of anti -back flow structure is solved from the'force adhesion + structure dislocation'dual dimension.

Description

Technical Field

[0001] This utility model relates to the field of gas meter technology, specifically a gas meter with anti-backflow function. Background Technology

[0002] Ultrasonic gas meters are intelligent instruments that measure gas flow using the principle of ultrasonic flow measurement. Compared with traditional diaphragm gas meters, they have significant advantages in terms of measurement accuracy, stability, and functional expandability. Ultrasonic gas meters are not only precise measurement tools, but also intelligent nodes connecting users and the gas system. Through the multiple functions of "precise measurement + intelligent management + safety protection", they not only protect the interests of both gas supply and demand sides, but also promote the development of the gas industry towards efficiency, safety, and digitalization.

[0003] The existing utility model patent with publication number CN218724416U discloses an anti-backflow device for a diaphragm gas meter and a diaphragm gas meter, including a positioning seat with a gas flow channel in the middle. A cover plate is rotatably mounted on one side of the positioning seat, and the size of the cover plate is at least enough to cover the gas flow channel of the positioning seat. The cover plate is also provided with raised ribs. This utility model has a simple structure. The anti-backflow device is assembled in the airflow channel of the diaphragm gas meter's core assembly. When the gas flows in the forward direction, the cover plate flips up; when the gas flows in the reverse direction, the cover plate covers the gas flow channel of the positioning seat. This not only prevents the counter from running backward but also prevents the gas from flowing backward through the gas meter device, thereby greatly reducing leakage and improving sealing.

[0004] The aforementioned diaphragm gas meter restricts the direction of gas flow by opening and closing the cover plate. During use, the cover plate will wear down over time, affecting its sealing performance. In addition, the cover plate only self-aligns and there is no external force restricting it from the top of the positioning seat, resulting in poor sealing performance. Utility Model Content

[0005] To address the shortcomings of existing technologies, this utility model provides a gas meter with anti-backflow function, which solves the problems of poor sealing and the impact of wear on the anti-backflow structure on the sealing effect.

[0006] To achieve the above objectives, this utility model provides the following technical solution: A gas meter with anti-backflow function includes a housing, and a monitoring mechanism for monitoring gas flow is provided inside the housing. The monitoring mechanism includes:

[0007] The flow measurement component calculates the gas flow rate by measuring the time required for ultrasonic waves to propagate within the fluid.

[0008] The anti-backflow component includes a connecting pipe disposed inside the housing, a guide pipe fixedly installed inside the connecting pipe, a movable column inserted through the center of the guide pipe, an elastic frame fixedly installed on the outer side of the movable column, a sealing gasket fixedly installed above the elastic frame, a sealing plug fitted at the bottom end of the movable column, a fixing frame fixedly installed inside the connecting pipe, an air chamber fixedly installed at the center of the fixing frame, and a magnet installed on one side of the fixing frame and the outer side of the movable column.

[0009] Preferably, the flow measurement component includes a control board fixedly installed inside the housing and a digital display screen fitted onto the surface of the housing. A measurement chamber is fixedly installed inside the housing, and a partition is fixedly installed inside the measurement chamber.

[0010] Preferably, an ultrasonic module is fixedly installed at the bottom of the measuring chamber, a sealing plate is fixedly installed below the ultrasonic module, a protective shell is fixedly installed below the measuring chamber, and the flow measurement assembly further includes a shut-off valve fixedly installed at the top of the shell, with a sealing ring inserted through the outside of the shut-off valve.

[0011] Preferably, the two ends of the measuring chamber are connected to the anti-backflow components on both sides. There are three partitions installed at equal intervals in the measuring chamber. The ultrasonic module is divided into a left generator and a right receiver, which are respectively installed in the inclined tubular protrusion structure at the bottom of the measuring chamber. The isolation valve is fixedly installed at the air inlet of the measuring chamber.

[0012] Preferably, the top of the connecting pipe has an arc-shaped structure, and the top of the connecting pipe is provided with an annularly distributed opening structure. The opening structure of the sealing gasket is staggered from the opening structure at the top of the connecting pipe.

[0013] Preferably, the movable column and the connecting pipe form a sliding connection, the bottom end of the movable column and the sealing gasket are located inside the air cavity, the sealing gasket is fitted with the inner wall of the air cavity, and the magnet on the outside of the movable column has opposite magnetic poles to the magnet above the fixed frame.

[0014] Beneficial effects

[0015] This utility model provides a gas meter with anti-backflow function. Compared with the prior art, it has the following advantages:

[0016] (1) In this gas meter with anti-backflow function, the anti-backflow structure has magnets with opposite magnetic poles installed on the movable column and the fixed frame respectively. The repulsive force generated by the two will continuously push the movable column towards the top of the connecting pipe. At the same time, the gas pressure inside the gas chamber will form an auxiliary thrust from the bottom of the movable column. The two forces work together to make the movable column drive the sealing gasket to fit tightly against the arc-shaped structure at the top of the connecting pipe through the elastic frame, avoiding gaps between the sealing gasket and the connecting pipe due to insufficient adhesion. In addition, the top of the connecting pipe is designed with annularly distributed openings, and the positions of these openings and the openings of the sealing gasket are staggered. Even if there is a very small gap in the fit, the staggered opening structure can further block the gas backflow channel. Combined with the tight fit between the sealing gasket and the arc-shaped surface of the connecting pipe, the problem of poor sealing of the anti-backflow structure is solved from the dual dimensions of "force fit + structural misalignment".

[0017] (2) This gas meter with anti-backflow function reduces the impact of wear on the sealing effect by optimizing the contact form and stress compensation logic of the anti-backflow structure. On the one hand, the core seal of the anti-backflow structure relies on the surface contact between the sealing gasket and the top of the connecting pipe, rather than the rotational friction contact of the cover plate in the traditional anti-backflow structure. The surface contact form greatly reduces the frictional loss of the key sealing component (sealing gasket) during use. At the same time, the elastic skeleton supports and fixes the sealing gasket, maintaining the structural stability of the sealing gasket and preventing the sealing gasket from being worn out due to long-term stress deformation, thus extending the effective sealing cycle of the sealing gasket. On the other hand, the moving column and the guide pipe adopt a sliding fit method, with a smooth mating surface and reasonable contact area. The wear during the sliding process is much lower than the wear of the traditional rotating structure, reducing the overall wear of the anti-backflow structure. Even if the sealing gasket experiences slight wear due to long-term use, the magnetic repulsion between the movable column and the fixed frame will continue to push the movable column. Combined with the rebound force of the gas inside the air chamber, this ensures that the sealing gasket always remains tightly fitted to the top of the connecting pipe. The stable force compensates for the sealing gap caused by slight wear, preventing wear from directly reducing the sealing effect, thus solving the problem of wear on the anti-backflow structure affecting the sealing effect. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0019] Figure 2 This is a schematic diagram of the outer shell mounting structure of this utility model;

[0020] Figure 3 This is a schematic diagram of the cross-sectional structure of the connecting pipe and the measuring chamber of this utility model;

[0021] Figure 4 This is a schematic diagram of the elastic frame installation structure of this utility model;

[0022] In the diagram: 1. Outer shell; 2. Monitoring mechanism; 21. Flow measurement component; 211. Control board; 212. Digital display screen; 213. Measurement chamber; 214. Partition plate; 215. Ultrasonic module; 216. Sealing plate; 217. Protective shell; 218. Isolation valve; 219. Sealing ring; 22. Anti-backflow component; 221. Connecting pipe; 222. Guide pipe; 223. Movable column; 224. Elastic frame; 225. Sealing gasket; 226. Sealing plug; 227. Fixing frame; 228. Air chamber; 229. Magnet. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] Please see Figure 1-4 This utility model provides a technical solution: a gas meter with anti-backflow function includes a housing 1, and a monitoring mechanism 2 for monitoring gas flow is provided inside the housing 1. The monitoring mechanism 2 includes:

[0025] The flow measurement component 21 calculates the gas flow rate by measuring the time required for ultrasonic waves to propagate within the fluid. The flow measurement component 21 includes a control board 211 fixedly installed inside the housing 1 and a digital display screen 212 fitted onto the surface of the housing 1. A measurement chamber 213 is fixedly installed inside the housing 1, and a partition 214 is fixedly installed inside the measurement chamber 213. An ultrasonic module 215 is fixedly installed at the bottom of the measurement chamber 213, and a sealing plate 216 is fixedly installed below the ultrasonic module 215. A further sealing plate 216 is fixedly installed below the measurement chamber 213. The flow measurement assembly 21 includes a protective shell 217 and a shut-off valve 218 fixedly installed on the top of the shell 1. A sealing ring 219 is inserted and installed on the outside of the shut-off valve 218. The two ends of the measuring chamber 213 are connected to the anti-backflow assemblies 22 on both sides. There are three partitions 214 installed at equal intervals in front and behind inside the measuring chamber 213. The ultrasonic module 215 is divided into a left generator and a right receiver, which are respectively installed in the inclined tubular protrusion structure at the bottom of the measuring chamber 213. The shut-off valve 218 is fixedly installed at the air inlet end of the measuring chamber 213.

[0026] Specifically, the outer casing 1 can protect the monitoring mechanism 2. Ultrasonic waves are emitted by a generator on one side of the ultrasonic module 215 and received by a receiver on the other side. The control board 211 can infer the gas flow rate based on the propagation time of the ultrasonic waves in the gas and calculate the gas flow rate by combining it with the cross-sectional area of ​​the measuring chamber 213. The data is accumulated and displayed on the digital display screen 212. The sealing plate 216 can prevent gas leakage, the isolation valve 218 can close the gas flow path, and the sealing ring 219 can perform a sealing function.

[0027] The anti-backflow component 22 includes a connecting pipe 221 disposed inside the housing 1. A guide pipe 222 is fixedly installed inside the connecting pipe 221. A movable column 223 is inserted through the center of the guide pipe 222. An elastic frame 224 is fixedly installed on the outside of the movable column 223. A sealing gasket 225 is fixedly installed above the elastic frame 224. A sealing plug 226 is fitted into the bottom end of the movable column 223. A fixing frame 227 is fixedly installed inside the connecting pipe 221. An air chamber 228 is fixedly installed in the center of the fixing frame 227. A magnet is installed on one side of the movable column 223 and the outside of the movable column 223. The top of the connecting tube 221 has an arc-shaped structure. The top of the connecting tube 221 has a ring-shaped opening structure. The opening structure of the sealing gasket 225 is offset from the opening structure at the top of the connecting tube 221. The movable column 223 and the connecting tube 221 form a sliding connection. The bottom of the movable column 223 and the sealing gasket 225 are located inside the air cavity 228. The sealing gasket 225 is fitted into the inner wall of the air cavity 228. The magnet on the outside of the movable column 223 has opposite magnetic poles to the magnet above the fixed frame 227.

[0028] Specifically, when using natural gas, the gas pressure on both sides of the sealing gasket 225 is equal. Under the influence of the magnetism of the magnet and the gas pressure inside the gas chamber 228, the sealing gasket 225 remains in contact with the arc-shaped structure at the top of the guide pipe 222. Since the opening structure of the guide pipe 222 and the opening structure of the sealing gasket 225 are misaligned, the gas on the side of the sealing gasket 225 cannot pass through the guide pipe 222. When using natural gas, the gas pressure on the side of the sealing gasket 225 decreases, and the gas pressure on the side of the guide pipe 222 will push the movable column 223 to move. At the same time, the sealing gasket 225 and the guide pipe 222 separate, forming a cavity. The gas can enter this cavity and then pass through the opening structure of the sealing gasket 225 and the anti-backflow component 22. At this time, the movable column 223 will compress the gas inside the gas chamber 228 through the sealing plug 226. When natural gas is not used, the gas inside the gas chamber 228 and the magnet will push the movable column 223 to reset.

[0029] Specifically, the model number of the isolation valve 218 is [model number missing]. Furthermore, any content not described in detail in this specification is existing technology known to those skilled in the art.

[0030] During operation, the gas first enters the device through the isolation valve 218 at the top of the outer casing 1. The sealing ring 219 installed on the outside of the isolation valve 218 can effectively seal the gap at the gas inlet end and prevent gas leakage. Then the gas flows into the connecting pipe 221 of the anti-backflow component 22.

[0031] When the gas is not in use initially, the magnet 229 installed on the outside of the movable column 223 in the anti-backflow component 22 and the magnet 229 installed above the fixed frame 227 generate a repulsive force due to their opposite magnetic poles. At the same time, the gas pressure inside the gas chamber 228 works together to push the movable column 223 to maintain a stable position along the guide pipe 222. This causes the sealing gasket 225 fixed on the outside of the movable column 223 by the elastic skeleton 224 to fit tightly against the arc-shaped structure at the top of the connecting pipe 221. Furthermore, because the opening structure at the top of the connecting pipe 221 is arranged in a ring shape and is offset from the opening structure of the sealing gasket 225, the gas cannot pass through the anti-backflow component 22 at this time.

[0032] When the user uses gas, the gas pressure on the side of the sealing gasket 225 away from the guide pipe 222 decreases. The gas pressure in the connecting pipe 221 is greater than the sum of the repulsive force and the gas pressure inside the gas chamber 228, which in turn pushes the movable column 223 to slide along the guide pipe 222. The movable column 223 causes the sealing gasket 225 to separate from the top of the connecting pipe 221, forming a cavity between them. The gas first enters the cavity and then passes through the anti-backflow component 22 through the opening structure of the sealing gasket 225. At the same time, the sealing plug 226 installed at the bottom of the movable column 223 will synchronously compress the gas inside the gas chamber 228 fixed in the center of the fixing frame 227.

[0033] Gas passing through the anti-backflow component 22 enters the measuring chamber 213 fixed inside the outer casing 1. Three partitions 214, equidistant from front to back, inside the measuring chamber 213 guide the stable flow of gas. Inside the inclined tubular protrusion at the bottom of the measuring chamber 213, the left generator and right receiver of the ultrasonic module 215 are respectively installed. The left generator emits ultrasonic waves, and the right receiver receives them. The control board 211 fixed inside the outer casing 1 calculates the gas flow rate based on the propagation time of the ultrasonic waves in the gas, and then calculates the gas flow rate by combining it with the cross-sectional area of ​​the measuring chamber 213. After accumulating the flow rate data, it is displayed on the digital display screen 212 embedded in the surface of the outer casing 1. The sealing plate 216 fixed at the bottom of the measuring chamber 213 prevents gas from leaking from the bottom of the measuring chamber 213, and the protective shell 217 fixed below the measuring chamber 213 protects the ultrasonic module 215.

[0034] When the user stops using the gas, the gas pressure on both sides of the sealing gasket 225 gradually returns to equilibrium. The compressed gas inside the gas chamber 228 generates a rebound force, which, together with the repulsive force between the magnets 229, pushes the movable column 223 back to its original position along the guide pipe 222. The sealing gasket 225 then fits tightly against the top arc surface structure of the connecting pipe 221 again, blocking the gas flow and achieving the backflow prevention function.

[0035] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0036] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A gas meter with anti-backflow function, characterized in that: Includes a housing (1), and inside the housing (1) is a monitoring mechanism (2) for monitoring gas flow, the monitoring mechanism (2) including: The flow measurement component (21) calculates the gas flow rate by measuring the time required for ultrasonic waves to propagate within the fluid; The anti-backflow component (22) includes a connecting pipe (221) disposed inside the housing (1). A guide pipe (222) is fixedly installed inside the connecting pipe (221). A movable column (223) is inserted through the center of the guide pipe (222). An elastic frame (224) is fixedly installed on the outside of the movable column (223). A sealing gasket (225) is fixedly installed above the elastic frame (224). A sealing plug (226) is fitted into the bottom end of the movable column (223). A fixing frame (227) is fixedly installed inside the connecting pipe (221). An air chamber (228) is fixedly installed in the center of the fixing frame (227). A magnet (229) is installed on one side of the fixing frame (227) and the outside of the movable column (223).

2. A gas meter with anti-backflow function according to claim 1, characterized in that: The flow measurement component (21) includes a control board (211) fixedly installed inside the housing (1) and a digital display screen (212) fitted onto the surface of the housing (1). A measurement chamber (213) is fixedly installed inside the housing (1), and a partition (214) is fixedly installed inside the measurement chamber (213).

3. A gas meter with anti-backflow function according to claim 2, characterized in that: An ultrasonic module (215) is fixedly installed at the bottom of the measuring chamber (213), a sealing plate (216) is fixedly installed below the ultrasonic module (215), a protective shell (217) is fixedly installed below the measuring chamber (213), and the flow measurement assembly (21) also includes a shut-off valve (218) fixedly installed at the top of the outer shell (1), and a sealing ring (219) is inserted and installed on the outside of the shut-off valve (218).

4. A gas meter with anti-backflow function according to claim 3, characterized in that: The two ends of the measuring chamber (213) are connected to the anti-backflow components (22) on both sides. There are three partitions (214) installed at equal intervals in front and behind inside the measuring chamber (213). The ultrasonic module (215) is divided into a left generator and a right receiver, which are respectively installed in the inclined tubular protrusion structure at the bottom of the measuring chamber (213). The isolation valve (218) is fixedly installed at the air inlet of the measuring chamber (213).

5. A gas meter with anti-backflow function according to claim 1, characterized in that: The top of the connecting pipe (221) is an arc-shaped structure, and the top of the connecting pipe (221) is provided with an annularly distributed opening structure. The opening structure of the sealing gasket (225) is offset from the opening structure at the top of the connecting pipe (221).

6. A gas meter with anti-backflow function according to claim 1, characterized in that: The movable column (223) and the connecting pipe (221) form a sliding connection. The bottom end of the movable column (223) and the sealing gasket (225) are located inside the air chamber (228). The sealing gasket (225) is fitted into the inner wall of the air chamber (228). The magnet (229) on the outside of the movable column (223) has opposite magnetic poles to the magnet (229) above the fixed frame (227).

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