A diaphragm gas meter
By introducing an anti-reverse component with a ratchet disc and pawl into the diaphragm gas meter, the problem of easy reversal in traditional diaphragm gas meters has been solved, achieving accurate gas metering and protecting the interests of gas companies and users.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- DONGXING INTELLIGENT INSTR CO LTD OF ZHEJIANG CANGNAN INSTR GRP CO LTD
- Filing Date
- 2025-07-03
- Publication Date
- 2026-06-09
Smart Images
Figure CN224340994U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of gas meter technology, specifically a diaphragm gas meter. Background Technology
[0002] Diaphragm gas meters are commonly used gas metering devices for residential and commercial users. Their working principle is based on volumetric metering. Metering chambers separated by a diaphragm reciprocate under pressure difference, and gas flow is accumulated through mechanical transmission. Currently, diaphragm gas meters on the market are mainly divided into aluminum-cased and steel-cased meters, and are widely used in metering scenarios for combustible gases such as natural gas, manufactured gas, and liquefied petroleum gas.
[0003] With the increasing prevalence of gas supply systems, the demand for diaphragm gas meters continues to grow. However, traditional technology has gradually revealed the following problems in practical applications: Traditional diaphragm gas meters lack an efficient anti-reverse mechanism. When a user maliciously reverses the meter or when gas flow reverses in the pipeline, the counter is prone to reversing, resulting in a reading lower than the actual gas consumption. According to industry statistics, gas meters without anti-reverse devices may experience metering deviations due to reversal during their service life, which not only harms the gas company's revenue but may also lead to metering disputes between users and gas suppliers.
[0004] To address this issue, we designed a diaphragm gas meter. Utility Model Content
[0005] The purpose of this invention is to provide a diaphragm gas meter to solve the problems mentioned in the background art.
[0006] To solve the above-mentioned technical problems, this utility model provides a diaphragm gas meter, including a gas meter body. The top of the gas meter body is provided with an inlet pipe and an outlet pipe. A connecting rod is provided inside the gas meter body. A connecting plate is hinged to the other end of the connecting rod. A meshing tooth part is fixedly connected to the bottom end of the connecting plate. A fixing plate is provided at the bottom end of the meshing tooth part. A central shaft is fixedly connected to the bottom end of the fixing plate. A circular cavity is formed through the meshing tooth part. An anti-reverse component is provided in the cavity.
[0007] Furthermore, the anti-reverse assembly includes a ratchet disc, which is fixedly connected to the inner wall of the circular cavity. A pawl is engaged inside the ratchet disc, and a slider is fixedly connected to the end of the pawl away from the ratchet disc. A return spring is fixedly connected to the end of the slider away from the pawl.
[0008] Furthermore, a fixing block is fixedly connected to the end of the reset spring away from the slider, and the fixing block is fixedly connected to the center of the top of the fixing plate.
[0009] Furthermore, the slider has limit frames at both ends, the limit frames are fixedly connected to the top of the fixed plate, and the slider is slidably connected between the two limit frames.
[0010] Furthermore, one side of the meshing teeth is meshed with a pulley, one side of the pulley is meshed with a gear set, one side of the gear set is connected to a counter, and the counter is fixedly connected to the front of the gas meter body.
[0011] Furthermore, the gas meter body has two identical diaphragms inside.
[0012] Furthermore, all materials inside the gas meter body are non-magnetic.
[0013] Furthermore, threads are provided on the surfaces of both the air inlet pipe and the air outlet pipe.
[0014] Compared with the prior art, the beneficial effects of this utility model are:
[0015] In this invention, the anti-reverse component composed of the ratchet disc and the pawl can prevent the gas meter from reversing in real time, avoiding the reduction of metering data caused by users maliciously reversing the meter body or airflow reversal, thus protecting the rights and interests of both the gas company and the user. Attached Figure Description
[0016] Figure 1 This is a schematic diagram of the main external structure of this utility model;
[0017] Figure 2 This is a cross-sectional view of the internal structure of this utility model;
[0018] Figure 3 This is a schematic diagram of the overall structure of the connecting disc of this utility model;
[0019] Figure 4 This is a cross-sectional structural diagram of the meshing teeth of this utility model.
[0020] In the diagram: 1. Gas meter body; 2. Inlet pipe; 3. Outlet pipe; 4. Connecting rod; 5. Connecting disc; 6. Meshing teeth; 7. Fixed disc; 8. Central shaft; 9. Passing wheel; 10. Counter; 11. Ratchet disc; 12. Pawl; 13. Slider; 14. Limiting frame; 15. Return spring; 16. Fixed block. Detailed Implementation
[0021] 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.
[0022] Please see Figure 3 and Figure 4 This utility model provides a technical solution: a diaphragm gas meter, including a gas meter body 1, an inlet pipe 2 and an outlet pipe 3 at the top of the gas meter body 1, a connecting rod 4 inside the gas meter body 1, a connecting plate 5 hinged to the other end of the connecting rod 4, a meshing tooth part 6 fixedly connected to the bottom end of the connecting plate 5, a fixing plate 7 at the bottom end of the meshing tooth part 6, a central shaft 8 fixedly connected to the bottom end of the fixing plate 7, a circular cavity penetrating through the meshing tooth part 6, an anti-reverse component inside the cavity, the anti-reverse component including a ratchet disc 11, the ratchet disc 11 fixedly connected to the inner wall of the circular cavity, a pawl 12 meshing inside the ratchet disc 11, a slider 13 fixedly connected to the end of the pawl 12 away from the ratchet disc 11, a return spring 15 fixedly connected to the end of the slider 13 away from the pawl 12, and a fixing block 16 fixedly connected to the end of the return spring 15 away from the slider 13, the fixing block 16 fixedly connected to the center of the top of the fixing plate 7.
[0023] In practice, when the gas flows in the forward direction, the fixed disk 7 rotates normally with the connecting disk 5, and the pawl 12 slides in the tooth groove of the ratchet disk 11, allowing clockwise rotation. If an abnormal reverse flow occurs, the pawl 12 will get stuck in the tooth groove of the ratchet disk 11, preventing the fixed disk 7 from rotating counterclockwise.
[0024] See Figure 2 The gas meter body 1 has two identical diaphragms inside, which together form four metering chambers. The meter body has an air inlet and an air outlet, which create a pressure difference between the air inlet and the air outlet, thereby driving the diaphragms to move.
[0025] See Figure 4 Limit frames 14 are provided at both ends of the slider 13. The limit frames 14 are fixedly connected to the top of the fixed plate 7, and the slider 13 is slidably connected between the two limit frames 14.
[0026] In practice, the limit frame 14 plays a linear guiding role in the movement of the slider 13, preventing the slider 13 from shifting laterally, causing the pawl 12 to misalign with the ratchet disk 11 and lose its anti-reverse function.
[0027] See Figure 1 and Figure 2One side of the meshing toothed part 6 is meshed with a pulley 9, and one side of the pulley 9 is meshed with a gear set. One side of the gear set is connected to a counter 10, and the counter 10 is fixedly connected to the front of the gas meter body 1.
[0028] In practice, the meshing teeth 6 at the bottom of the connecting disc 5 engage with the guide wheel 9 as it swings, converting the swing into rotational motion. The guide wheel 9 drives the gear set to further decelerate and transmit power to the counter 10, thereby realizing the cumulative display of gas usage.
[0029] See Figure 2 The gas meter body 1 contains a non-magnetic material inside.
[0030] In practice, the gas meter body 1 contains non-magnetic materials such as aluminum alloy and engineering plastics to avoid external magnetic fields interfering with gear transmission and ensure metering accuracy.
[0031] See Figure 1 Both the inlet pipe 2 and the outlet pipe 3 have threads on their surfaces for connecting pipes.
[0032] In practice, the threads on the surfaces of the air inlet pipe 2 and the air outlet pipe 3 are used to connect to external pipes, ensuring sealing and ease of installation.
[0033] Working Principle: Gas enters the gas meter body 1 through the inlet pipe 2, reaches the inlet through the internal channel, and enters the metering chamber under the action of pressure difference. Two diaphragms divide the inside of the meter body into four metering chambers. Gas alternately enters different metering chambers, driving the diaphragms to reciprocate. For example, when gas enters the left metering chamber, the diaphragm moves to the right, and the right metering chamber exhausts gas; and vice versa. The movement of the diaphragms causes the four metering chambers to complete the "intake-expansion-exhaust-contraction" cycle in sequence, achieving continuous and stable gas metering. The reciprocating motion of the diaphragms is transmitted to the connecting plate 5 through the connecting rod 4, causing the connecting plate 5 to swing around the central axis 8. The meshing teeth 6 at the bottom of the connecting plate 5 engage with the guide wheel 9 as it swings, converting the swing into rotational motion. The guide wheel 9 drives the gear set, further decelerating and transmitting power to the counter 10, realizing the cumulative display of gas usage. When the gas flows in the forward direction, the fixed plate 7 rotates normally with the connecting plate 5, and the pawl 12 slides in the tooth groove of the ratchet disc 11, allowing clockwise rotation. If an abnormal reverse flow occurs, such as when a user attempts to reverse the counter, the pawl 12 will get stuck in the tooth groove of the ratchet disc 11, preventing the fixed disc 7 from rotating counterclockwise. At this time, the slider 13 slides within the limit frame 14 and compresses the return spring 15, but cannot unlock the ratchet mechanism, thus preventing the counter 10 from reversing. When the forward flow resumes, the return spring 15 pushes the slider 13 and the pawl 12 back to their original positions, allowing normal rotation.
[0034] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the content of this utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.
Claims
1. A diaphragm gas meter, comprising a gas meter body (1), characterized in that, The gas meter body (1) is provided with an inlet pipe (2) and an outlet pipe (3) at the top. A connecting rod (4) is provided inside the gas meter body (1). A connecting plate (5) is hinged to the other end of the connecting rod (4). A meshing tooth part (6) is fixedly connected to the bottom end of the connecting plate (5). A fixing plate (7) is provided at the bottom end of the meshing tooth part (6). A central shaft (8) is fixedly connected to the bottom end of the fixing plate (7). A circular cavity is opened through the meshing tooth part (6). An anti-reverse component is provided in the cavity.
2. A diaphragm gas meter as described in claim 1, characterized in that: The anti-reverse assembly includes a ratchet disc (11), which is fixedly connected to the inner wall of a circular cavity. A pawl (12) is engaged inside the ratchet disc (11). A slider (13) is fixedly connected to one end of the pawl (12) away from the ratchet disc (11). A return spring (15) is fixedly connected to one end of the slider (13) away from the pawl (12).
3. A diaphragm gas meter as described in claim 2, characterized in that: The end of the reset spring (15) away from the slider (13) is fixedly connected to a fixing block (16), which is fixedly connected to the center of the top of the fixing plate (7).
4. A diaphragm gas meter as described in claim 3, characterized in that: The slider (13) has limit frames (14) at both ends. The limit frames (14) are fixedly connected to the top of the fixed plate (7). The slider (13) is slidably connected between the two limit frames (14).
5. A diaphragm gas meter as described in claim 4, characterized in that: One side of the meshing toothed part (6) is meshed with a pulley (9), and one side of the pulley (9) is meshed with a gear set. One side of the gear set is connected to a counter (10), and the counter (10) is fixedly connected to the front of the gas meter body (1).
6. A diaphragm gas meter as described in claim 5, characterized in that: The gas meter body (1) has two identical diaphragms inside.
7. A diaphragm gas meter as described in claim 6, characterized in that: All materials inside the gas meter body (1) are non-magnetic.
8. A diaphragm gas meter as described in claim 7, characterized in that: Both the air inlet pipe (2) and the air outlet pipe (3) are provided with threads on their surfaces.