Gas meter with anti-backflow movement

Abstract

The invention relates to the technical field of gas meters, and discloses a gas meter with an anti-backflow movement, the gas meter comprises a meter shell, a membrane type metering assembly and the anti-backflow movement, the membrane type metering assembly and the anti-backflow movement are installed in the meter shell, the membrane type metering assembly comprises two membrane cavity assemblies, a leather membrane is arranged between the membrane cavity assemblies, and the membrane cavity assemblies are connected with the membrane. Each diaphragm cavity assembly is divided into two metering air chambers by the diaphragm, and in the same diaphragm cavity assembly, the four metering air chambers contained in the two diaphragm cavity assemblies are jointly communicated with the anti-backflow machine core. By means of the anti-backflow machine core, gas backflow is effectively prevented, and safety and reliability of the gas meter are remarkably improved. The anti-backflow assembly is in linkage with the membrane type metering assembly, opening and closing of a valve element can be automatically controlled according to the flowing direction of fuel gas, one-way flowing of the fuel gas is ensured, and accurate metering and safe control of the fuel gas are achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of gas meters, and in particular to a gas meter with an anti-backflow movement. Background Art

[0002] Gas meters are essential devices for measuring gas usage and are widely used in homes, businesses, and industries. With the increasing prevalence of gas use, the safety and reliability of gas meters are receiving increasing attention. During gas transportation, reverse flow can occur due to pipeline pressure fluctuations or improper user operation. This can not only lead to inaccurate meter readings but also pose safety risks such as gas leaks and explosions.

[0003] Diaphragm gas meters are the predominant type of gas meter due to their long history, mature technology, high metering accuracy, and low cost. When gas enters a diaphragm gas meter, it causes the diaphragm to elastically expand. As gas continues to flow, the diaphragm expands and drives the connected mechanical transmission mechanism. The mechanical transmission mechanism converts the diaphragm's expansion into rotational motion, which, through mechanical structures such as gear transmission, ultimately drives a counter to achieve cumulative gas flow measurement. However, current diaphragm gas meters have poor backflow protection. Backflow of gas can cause the gas transmission mechanism to reverse, leading to inaccurate counting or damage to the mechanical transmission mechanism.

[0004] Application document CN114739472A discloses an anti-reversal and anti-backflow device for a diaphragm gas meter. This device achieves this anti-reversal effect by providing a check plate on the valve cover. The check plate cooperates with a slot on the valve cover, limiting the valve cover to one-way rotation, thereby achieving a check effect. However, a diaphragm gas meter controls the swing of a connecting rod mechanism through the movement of the diaphragm, which then converts this swing into rotation of the valve cover. The valve cover reverses because the diaphragm, driven by the reverse airflow, moves in the opposite direction, thereby driving the valve cover to reverse through the connecting rod mechanism. If the valve cover is only restricted from reversing at the valve cover, the reverse airflow can still drive the diaphragm to move in the reverse direction, which can easily damage the connecting rod mechanism and render the entire gas meter inoperable. Summary of the Invention

[0005] The present invention aims to provide a gas meter with an anti-backflow mechanism to solve the problem that existing gas meters are difficult to prevent backflow.

[0006] The present invention is achieved through the following technical solutions:

[0007] A gas meter with an anti-backflow mechanism comprises a meter case, a diaphragm metering assembly installed in the meter case, and an anti-backflow mechanism. The diaphragm metering assembly comprises two membrane cavity assemblies, a membrane is provided between each membrane cavity assembly, and the membrane divides each membrane cavity assembly into two metering gas chambers. In the same membrane cavity assembly, the four metering gas chambers contained in the two membrane cavity assemblies are connected to the anti-backflow mechanism.

[0008] The anti-backflow core includes a core body and a first one-way diaphragm assembly and a second one-way diaphragm assembly arranged on the core body. The core body includes an inner ring body and an outer ring body. The inner ring body is coaxially arranged with the outer ring body. An annular cavity is provided in the inner ring body, and the annular cavity is connected to the gas outlet.

[0009] In a possible design, four fan-shaped cavities are divided between the outer ring body and the inner ring body by four partitions, one side of each fan-shaped cavity is connected to a metering air chamber, and each fan-shaped cavity is also provided with an air inlet on the side away from the metering air chamber, and each air inlet is provided with a first one-way diaphragm assembly.

[0010] In one possible design, the first one-way diaphragm assembly includes a one-way sealing plate, an elastic strip and a fixing seat. The first one-way diaphragm assembly is arranged on one side of the air inlet within the fan-shaped cavity. The fixing seat is fixed on the core body. One end of the elastic strip is fixed to the fixing seat, and the other end of the elastic strip is fixed to the one-way sealing plate.

[0011] In a possible design, four air outlets are further provided on the inner ring body, and a second one-way diaphragm assembly is fixedly provided at each air outlet. The second one-way diaphragm assembly is used to allow the gas in the fan-shaped cavity to flow only in one direction in the annular cavity.

[0012] In a possible design, the second one-way diaphragm assembly includes a membrane frame and a one-way diaphragm, the membrane frame is fixed to the middle of the one-way diaphragm, the membrane frame and the one-way diaphragm are arranged on one side of the annular cavity, and the one-way diaphragm is in the shape of a membrane with thin sides and a thick middle.

[0013] In a possible design, an annular groove is further provided on the side of the inner ring body close to the valve plate, and an arc-shaped sealing diaphragm is fixedly provided on the valve plate. The arc-shaped sealing diaphragm rotates with the core body in the annular groove, and the arc-shaped sealing diaphragm is arranged on one side of the valve plate close to the wire rope vent valve port.

[0014] In one possible design, the diaphragm metering assembly also includes a connecting rod mechanism, an eccentric disk and a valve plate. The connecting rod mechanism is used to convert the movement of the diaphragm to drive the eccentric disk to rotate. The eccentric disk is fixed at one end of the central rotating shaft. The eccentric disk is also fixedly connected to the valve plate through the central rotating shaft. A vent valve port is provided on the valve plate.

[0015] In a possible design, the eccentric disk is also fixed to a gear, which is engaged with a transmission gear, which is engaged with an output gear. Both the transmission gear and the output gear are rotatably arranged on a support frame, and the support frame is fixed to the membrane chamber assembly.

[0016] In a possible design, the four metering gas chambers are connected to the four fan-shaped cavities through four connecting channels respectively, and the four connecting channels are respectively a first connecting channel, a second connecting channel, a third connecting channel and a fourth connecting channel. The first connecting channel and the fourth connecting channel are respectively connected to two metering gas chambers in the same membrane cavity assembly, and the first connecting channel and the fourth connecting channel are connected to two fan-shaped cavities separated on the core.

[0017] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0018] The present invention effectively prevents gas backflow through the anti-backflow mechanism, significantly improving the safety and reliability of the gas meter. The anti-backflow component is linked to the diaphragm metering component, and can automatically control the opening and closing of the valve core according to the direction of gas flow, ensuring one-way flow of gas, and realizing accurate metering and safe control of gas. Its core advantage is that it can effectively prevent gas backflow and ensure one-way flow of gas, thereby improving the metering accuracy and safety of the gas meter. Through the coordinated work of the diaphragm metering component and the anti-backflow mechanism, the gas meter can not only operate stably in a complex gas supply environment, but also significantly reduce equipment failures and maintenance costs caused by backflow. In addition, the design of the gas meter optimizes the layout and connection method of internal components, improves the overall performance and reliability, and ensures long-term stable operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings described herein are used to provide a further understanding of the embodiments of the present invention, constitute a part of this application, and do not constitute a limitation of the embodiments of the present invention. In the drawings:

[0020] Figure 1 It is a structural schematic diagram of the present invention;

[0021] Figure 2 It is a structural schematic diagram of the membrane metering component and the anti-backflow mechanism of the present invention;

[0022] Figure 3It is a structural diagram of the membrane metering component;

[0023] Figure 4 This is a schematic structural diagram of the anti-backflow mechanism of the present invention;

[0024] Figure 5 For Figure 4 Schematic diagram of the structure of the anti-backflow mechanism when observing in the opposite direction;

[0025] Figure 6 Schematic diagram of a top view of the anti-backflow mechanism of the present invention;

[0026] Figure 7 for Figure 6 Cross-sectional view at AA in the middle;

[0027] Figure 8 It is a structural diagram of the valve plate and the arc-shaped sealing diaphragm.

[0028] The figures represent: 1-casing, 2-gas outlet, 3-gas inlet, 4-gas outlet passage, 5-core body, 501-inner ring body, 502-outer ring body, 6-membrane chamber assembly, 7-center shaft, 8-connecting rod mechanism, 9-eccentric disk, 10-valve plate, 1001-vent valve port, 11-support frame, 12-transmission gear, 13-output gear, 14-first connecting channel, 15-second connecting channel, 16-third connecting channel, 17-fourth connecting channel, 18-air inlet, 19-annular groove, 20-air outlet, 21-fan-shaped cavity, 22-annular cavity, 23-one-way diaphragm, 24-membrane frame, 25-center sleeve, 26-one-way sealing plate, 27-elastic strip, 28-fixed seat, 29-arc-shaped sealing diaphragm. DETAILED DESCRIPTION

[0029] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with examples and drawings. The exemplary embodiments of the present invention and their descriptions are only used to explain the present invention and are not intended to limit the present invention.

[0030] Examples, such as Figures 1 to 8As shown, a gas meter with an anti-backflow mechanism includes a case 1, a diaphragm metering assembly installed in the case 1, and an anti-backflow mechanism. The case 1 is provided with a gas outlet 2 and a gas inlet 3. The gas inlet 3 is used to connect to a gas supply pipeline to provide gas to the case 1. The diaphragm metering assembly includes two membrane cavity assemblies 6. A membrane is provided between each membrane cavity assembly 6. The membrane divides each membrane cavity assembly 6 into two metering gas chambers. In the same membrane cavity assembly 6, one metering gas chamber is inflated while the other metering gas chamber is exhausted. The four metering gas chambers contained in the two membrane cavity assemblies 6 are connected to the anti-backflow mechanism. The anti-backflow mechanism completes the unidirectional flow of the metering gas chambers to prevent gas backflow. It can effectively prevent gas backflow, ensure unidirectional gas flow, improve the metering accuracy and safety of the gas meter, and prevent metering errors or equipment damage caused by backflow. Through precise one-way flow control, the reliability of gas meters is significantly improved, and failures caused by gas backflow are reduced, thereby reducing maintenance costs and downtime, and improving overall operational efficiency.

[0031] In this embodiment, the diaphragm metering assembly also includes a connecting rod mechanism 8, an eccentric disk 9 and a valve plate 10. In the diaphragm cavity assembly 6, when the gas is continuously injected into a metering gas chamber, the other metering gas chamber continuously discharges the internal gas. During this process, the diaphragm will move. The connecting rod mechanism 8 is used to convert the movement of the diaphragm into driving the eccentric disk 9 to rotate. The eccentric disk 9 is fixed to one end of the central rotating shaft 7. The eccentric disk 9 is also fixedly connected to the valve plate 10 through the central rotating shaft 7, so that the eccentric disk 9 drives the valve plate 10 to rotate together. A vent valve port 1001 is provided on the valve plate 10. When the valve plate 10 rotates, the vent valve port 1001 also rotates together. While the diaphragm cavity assembly 6 controls the rotation of the valve plate 10 through the connecting rod mechanism 8, the rotation of the vent valve port 1001 allows the gas to pass into each metering gas chamber in sequence, thereby completing the gas metering.

[0032] Furthermore, the eccentric disk 9 is also fixed to a gear, which is engaged with a transmission gear 12, and the transmission gear 12 is engaged with an output gear 13. The transmission gear 12 and the output gear 13 are both rotatably set on a support frame 11, and the support frame 11 and the membrane chamber assembly 6 remain fixed. Finally, the rotation of the eccentric disk 9 is output through the output gear 13, and the metering equipment that measures the rotation status of the output gear 13 can complete the counting and measurement of the gas flow in the meter.

[0033] In this embodiment, the anti-backflow core includes a core body 5 and a first one-way diaphragm 23 component and a second one-way diaphragm 23 component provided on the core body 5. The core body 5 includes an inner ring body 501 and an outer ring body 502. The inner ring body 501 is coaxially arranged with the outer ring body 502. An annular cavity 22 is provided in the inner ring body 501. The annular cavity 22 is connected to the gas outlet 2. Four partitions are used to divide four fan-shaped cavities 21 between the outer ring body 502 and the inner ring body 501. One side of each fan-shaped cavity 21 is connected to a The metering gas chambers are connected, and each of the fan-shaped cavities 21 is further provided with an air inlet 18 on the side away from the metering gas chamber. Each of the air inlet 18 is provided with a first one-way diaphragm 23 assembly. The first one-way diaphragm 23 assembly allows the gas to enter the fan-shaped cavity 21 only from the space inside the meter case 1, preventing the gas from flowing back from the fan-shaped cavity 21. The fan cavity 21 is connected to the metering gas chamber in the membrane cavity assembly 6. The first one-way diaphragm 23 assembly can effectively prevent the gas entering the metering gas chamber from being squeezed out in the reverse direction, thereby causing metering errors of the gas meter, and can also prevent gas backflow.

[0034] The anti-backflow mechanism effectively prevents gas backflow, protecting the diaphragm metering assembly from the impact of backflowing gas, improving the meter's reliability and durability while ensuring accurate gas metering. While ensuring safety, it also optimizes the meter's performance, enabling it to maintain stable operation even in complex operating environments, reducing the economic losses and safety hazards associated with equipment failures.

[0035] In this embodiment, the first one-way diaphragm 23 assembly includes a one-way sealing plate 26, an elastic strip 27 and a fixing seat 28. The first one-way diaphragm 23 assembly is arranged on one side of the air inlet 18 in the fan-shaped cavity 21. The fixing seat 28 is fixed on the core 5. One end of the elastic strip 27 is fixed to the fixing seat 28, and the other end of the elastic strip 27 is fixed to the one-way sealing plate 26. The one-way sealing plate 26 prevents the gas at the air inlet 18 from flowing out of the fan-shaped cavity 21 in the opposite direction.

[0036] Furthermore, four gas outlets 20 are provided on the inner ring body 501, so that the annular cavity 22 and the four fan-shaped cavities 21 are in a state of communication. A second one-way diaphragm 23 assembly is fixedly provided at each gas outlet 20. The second one-way diaphragm 23 assembly is used to allow the gas at the fan-shaped cavity 21 to flow only in one direction within the annular cavity 22. The second one-way diaphragm 23 assembly can effectively prevent the gas at the gas outlet 2 from flowing back into the fan-shaped cavity 21. The two one-way diaphragms 23 assemblies can effectively isolate the impact of the reverse airflow at the gas outlet 2 from the diaphragm metering assembly, which can provide better protection for the diaphragm metering assembly. The design of the second one-way diaphragm 23 assembly prevents the gas from flowing back from the outlet into the fan-shaped cavity 21, protects the diaphragm metering assembly from the impact of the reverse airflow, extends the service life of the equipment, and improves the overall performance and reliability of the gas meter. It enhances the protection capability of the equipment, reduces the vibration and noise caused by the reverse airflow, and improves the user experience.

[0037] In this embodiment, the second one-way diaphragm 23 assembly includes a membrane frame 24 and a one-way diaphragm 23. The membrane frame 24 is fixedly mounted in the middle of the one-way diaphragm 23. The membrane frame 24 and the one-way diaphragm 23 are located on one side of the annular cavity 22. The one-way diaphragm 23 is a thin membrane with thinner sides and a thinner center. The one-way diaphragm 23 can be made of silicone. The thinner side design of the one-way diaphragm 23 effectively ensures that the one-way diaphragm 23 has sufficient strength to prevent gas from flowing in the opposite direction, while the thinner side design ensures that gas can easily push aside the edge of the one-way diaphragm 23 and enter the annular cavity 22 during forward flow, ensuring both smooth forward flow and sufficient anti-backflow effect during reverse flow. The first one-way diaphragm 23 assembly, through the cooperation of the one-way sealing plate 26 and the elastic strip 27, effectively prevents gas from flowing back out of the air inlet 18, further enhancing the anti-backflow function, ensuring that gas can only flow in one direction, and improving the safety and metering accuracy of the gas meter. Clever use of the material's elasticity and sealing properties not only improves the component's response speed, but also enhances the system's overall stability, allowing it to maintain precise control in the face of pressure fluctuations and flow changes.

[0038] In this embodiment, the four metering gas chambers are connected to the four fan-shaped cavities 21 through four connecting channels respectively, and the four connecting channels are the first connecting channel 14, the second connecting channel 15, the third connecting channel 16 and the fourth connecting channel 17. The first connecting channel 14 and the fourth connecting channel 17 are respectively connected to the two metering gas chambers in the same membrane cavity assembly 6, and the first connecting channel 14 and the fourth connecting channel 17 are connected to the two fan-shaped cavities 21 separated by each other on the core body 5. Through such a design layout, it is ensured that the vent valve port 1001 will not simultaneously connect the two metering gas chambers in the membrane cavity assembly 6, thereby ensuring the normal operation of the diaphragm metering assembly.

[0039] Furthermore, at the air outlet 20, the gas entering at the air inlet 18 can enter the metering gas chamber through the connecting channel, but can also be discharged from the air outlet 20 to the gas outlet 2. To prevent this from happening, the inner ring body 501 is further provided with an annular groove 19 on the side close to the valve plate 10. The valve plate 10 is fixed with an arc-shaped sealing diaphragm 29, and the arc-shaped sealing diaphragm 29 rotates with the core body 5 in the annular groove 19. The arc-shaped sealing diaphragm 29 is arranged on the valve plate 10 on one side close to the wire rope ventilation valve port 1001. Therefore, through the arc-shaped sealing diaphragm 29, when the air inlet 18 at a fan-shaped cavity 21 is opened at the ventilation valve port 1001, the air outlet 20 at the position of the fan-shaped cavity 21 is sealed to prevent the gas entering the fan cavity 21 from entering the annular cavity 22, thereby ensuring the accuracy of gas metering.

[0040] In this embodiment, a gas outlet passage is provided between the gas outlet 2 and the annular cavity 22 , and the gas outlet 2 and the annular cavity 22 are communicated through the gas outlet passage.

[0041] The specific implementation methods described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific implementation method of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A gas meter with an anti-backflow mechanism, comprising a meter case (1), a diaphragm metering assembly installed in the meter case (1) and an anti-backflow mechanism, characterized in that: The membrane metering component comprises two membrane cavity components (6), a membrane is provided between each membrane cavity component (6), and the membrane divides each membrane cavity component (6) into two metering air chambers. In the same membrane cavity component (6), the four metering air chambers contained in the two membrane cavity components (6) are connected to the anti-backflow core. The anti-backflow mechanism comprises a core (5) and a first one-way diaphragm (23) assembly and a second one-way diaphragm (23) assembly arranged on the core (5); the core (5) comprises an inner ring body (501) and an outer ring body (502); the inner ring body (501) and the outer ring body (502) are coaxially arranged; an annular cavity (22) is provided in the inner ring body (501); and the annular cavity (22) is connected to a gas outlet (2).

2. A gas meter with an anti-backflow mechanism according to claim 1, characterized in that: Four fan-shaped cavities (21) are evenly divided between the outer ring body (502) and the inner ring body (501) by four partitions. One side of each fan-shaped cavity (21) is connected to a metering air chamber. An air inlet (18) is also provided on the side of each fan-shaped cavity (21) away from the metering air chamber. A first one-way diaphragm (23) assembly is provided at each air inlet (18).

3. A gas meter with an anti-backflow mechanism according to claim 2, characterized in that: The first one-way diaphragm (23) assembly includes a one-way sealing plate (26), an elastic strip (27) and a fixing seat (28). The first one-way diaphragm (23) assembly is arranged at the air inlet (18) on one side of the fan-shaped cavity (21). The fixing seat (28) is fixed on the core (5). One end of the elastic strip (27) is fixed to the fixing seat (28), and the other end of the elastic strip (27) is fixed to the one-way sealing plate (26).

4. A gas meter with an anti-backflow mechanism according to claim 1, characterized in that: The inner ring body (501) is also provided with four gas outlets (20), and a second one-way diaphragm (23) component is fixedly provided at each gas outlet (20). The second one-way diaphragm (23) component is used to allow the gas at the fan-shaped cavity (21) to flow into the annular cavity (22) in only one direction.

5. A gas meter with an anti-backflow mechanism according to claim 4, characterized in that: The second one-way diaphragm (23) assembly includes a membrane frame (24) and a one-way diaphragm (23), wherein the membrane frame (24) is fixedly arranged in the middle of the one-way diaphragm (23), and the membrane frame (24) and the one-way diaphragm (23) are arranged on one side inside the annular cavity (22), and the one-way diaphragm (23) is in the shape of a membrane with thin sides and thick middle.

6. A gas meter with an anti-backflow mechanism according to claim 1, characterized in that: The inner ring body (501) is also provided with an annular groove (19) on one side close to the valve plate (10), and an arc-shaped sealing diaphragm (29) is fixedly provided on the valve plate (10). The arc-shaped sealing diaphragm (29) rotates with the core body (5) in the annular groove (19), and the arc-shaped sealing diaphragm (29) is provided on one side of the valve plate (10) close to the wire rope ventilation valve port (1001).

7. A gas meter with an anti-backflow mechanism according to claim 6, characterized in that: The diaphragm metering assembly also includes a connecting rod mechanism (8), an eccentric disk (9) and a valve plate member (10). The connecting rod mechanism (8) is used to convert the movement of the diaphragm to drive the eccentric disk (9) to rotate. The eccentric disk (9) is fixed to one end of the central rotating shaft (7). The eccentric disk (9) is also fixedly connected to the valve plate member (10) through the central rotating shaft (7). A vent valve port (1001) is provided on the valve plate member (10).

8. A gas meter with an anti-backflow mechanism according to claim 7, characterized in that: The eccentric disk (9) is also fixed to a gear, which is engaged with a transmission gear (12), and the transmission gear (12) is engaged with an output gear (13). The transmission gear (12) and the output gear (13) are both rotatably arranged on a support frame (11), and the support frame (11) is fixed to the membrane chamber assembly (6).

9. A gas meter with an anti-backflow mechanism according to claim 2, characterized in that: The four metering gas chambers are connected to the four fan-shaped cavities (21) through four connecting channels, respectively. The four connecting channels are a first connecting channel (14), a second connecting channel (15), a third connecting channel (16) and a fourth connecting channel (17). The first connecting channel (14) and the fourth connecting channel (17) are respectively connected to two metering gas chambers in the same membrane cavity assembly (6). The first connecting channel (14) and the fourth connecting channel (17) are connected to two fan-shaped cavities (21) separated from each other on the core (5).

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