Diaphragm gas meter transmission structure

Abstract

The utility model discloses a diaphragm gas meter transmission structure which comprises a metering shell and a valve gate installed on the metering shell, a valve deck is installed above the valve gate, a door-shaped support is installed on the valve gate, a side frame of the door-shaped support is fixed to the valve gate, a transverse frame of the door-shaped support is located above the valve deck, and the transverse frame of the door-shaped support is located above the valve deck. A driving lever gear, a third wheel and a crank gear are installed on the door-shaped support, the third wheel is installed on the transverse frame through a supporting shaft, the driving lever gear is meshed with the third wheel, a connecting shaft is installed in a center hole of the valve cover, the upper portion of the connecting shaft extends out of the center hole, the extending end of the connecting shaft is fixedly sleeved with the crank gear, and the crank gear is meshed with the third wheel. According to the gas meter, the installation mode of the support is adopted, the installation accumulated error is reduced, the sealing performance of the gas meter is greatly improved, and meanwhile the metering precision is improved.

Description

Technical Field

[0001] This utility model relates to the field of gas meter technology, specifically to a diaphragm gas meter transmission structure. Background Technology

[0002] A diaphragm gas meter is a flow meter for measuring combustible gases. Gas enters the metering chamber through the inlet, causing the diaphragm to swing freely. The movement of the diaphragm assembly drives a rocker arm to activate a linkage mechanism, which in turn rotates the valve cover. This controls the sequential filling and exhaust of gas into each metering chamber, allowing the gas meter to circulate continuously. Simultaneously, the eccentric transmission crank gear of the linkage mechanism drives a lever gear through a passing wheel. The lever gear then drives a counter to count the gas flow. Finally, the counter displays the gas volume, thus achieving the purpose of measuring gas flow.

[0003] The existing diaphragm gas meters have brackets for mounting the lever gear, guide wheel, and crank gear on the metering housing. This creates several mounting references for the metering housing, valve grille, etc., resulting in significant cumulative errors that affect the meter's sealing. Simultaneously, because the crank gear is directly supported on the valve shaft, the valve cover rotation process relies on three sealing lines (inner ring, middle ring, and outer ring) between the valve cover and the valve grille to ensure the sealing of each chamber in the mechanism. However, since the valve grille and valve cover are made of plastic, they can deform to some extent during long-term storage or use, leading to poor sealing and consequently affecting the metering accuracy. Utility Model Content

[0004] To solve the above technical problems, this utility model provides a diaphragm gas meter with good sealing performance and accurate metering.

[0005] The technical solution is as follows: A diaphragm gas meter transmission structure includes a metering housing (3) and a valve grille (10) installed on the metering housing (3). A valve cover (9) is installed above the valve grille (10). The key point is that a portal bracket (6) is installed on the valve grille (10). The side frame (6a) of the portal bracket (6) is fixed on the valve grille (10), and the cross frame (6b) of the portal bracket (6) is located above the valve cover (9). The valve cover (9) is equipped with a lever gear (1), a pass wheel (4), and a crank gear (7), wherein the pass wheel (4) is mounted on the cross frame (6b) via a support shaft (4a), the lever gear (1) and the pass wheel (4) mesh, a connecting shaft (7a) is installed in the center hole (9a) of the valve cover (9), the upper part of the connecting shaft (7a) extends out of the center hole (9a), the crank gear (7) is fixedly sleeved at the extended end of the connecting shaft (7a), and the pass wheel (4) and the crank gear (7) mesh. With the above structure and the installation of the portal frame bracket, the portal frame bracket is directly supported on the valve grille, avoiding the direct installation of the bracket on the metering housing. This reduces the cumulative error during the installation of components such as the valve grille and valve cover. At the same time, since the lever gear, guide wheel, and crank gear are directly installed on the portal frame bracket, the valve cover only has a rotational relationship and no supporting relationship. Therefore, it will not cause deformation of the inner, middle, and outer rings of the valve grille that it seals with, greatly improving the sealing performance and providing metering accuracy.

[0006] Preferably, the central hole (9a) is located at the center of the valve cover (9), and the lower end of the central hole (9a) is closed. In the prior art, the lower end face of the central hole is the inner ring sealing line of the valve cover. In the above structure, the original inner ring of the valve cover is eliminated, and the lower end face of the central hole of the valve cover will not contact the inner ring of the valve grille, so that gas will not leak from the central hole due to deformation of the inner ring of the valve grille, which greatly improves the sealing performance.

[0007] Preferably, the contact surfaces of the valve cover (9) and the valve grille (10) form outer and middle ring sealing surfaces, and the lower end face of the central hole (9a) is lower than the sealing surface of the valve cover (9). In the prior art, the valve cover and the valve grille are sealed by corresponding outer, middle and inner rings. However, during long-term use, the inner ring deforms significantly, resulting in a substantial decrease in the sealing performance of the valve cover and the valve grille, which in turn affects the metering accuracy of the gas meter. In the above structure, the lower end face of the central hole does not contact the valve grille, thus avoiding long-term contact deformation and improving the sealing performance.

[0008] Preferably, the crank gear (7) includes an upper connecting disc (7b), a middle meshing tooth portion (7c), and a lower connecting shaft (7a). The connecting disc (7b), the meshing tooth portion (7c), and the connecting shaft (7a) are integrally formed. The meshing tooth portion (7c) meshes with the drive wheel (4). This structure makes the installation of the crank gear more reliable.

[0009] Preferably, the upper part of the connecting shaft (7a) is rotatably supported on the crossbeam (6b), and the lower part is elastically engaged with the bottom of the central hole (9a).

[0010] Preferably, a connecting shaft mounting post (6b1) is provided on the crossbar (6b), the connecting shaft mounting post (6b1) extends downward into the center hole (9a), and the lower end of the connecting shaft mounting post (6b1) is higher than the bottom of the center hole (9a). The connecting shaft (7a) passes through the connecting shaft mounting post (6b1) and engages with the center hole (9a).

[0011] Preferably, the outer wall of the connecting shaft mounting hole post (6b1) is larger at the top and smaller at the bottom, and the inner wall of the central hole (9a) is adapted to the structure of the outer wall of the connecting shaft mounting hole post (6b1).

[0012] The design of the above structure, due to the presence of the connecting shaft mounting hole post, especially the innovative design of the outer wall of the connecting shaft mounting hole post, makes the center hole of the valve cover, the connecting shaft of the crank gear, and the connecting shaft mounting hole post more concentric when the valve cover rotates, resulting in smoother valve cover rotation and better sealing.

[0013] Preferably, the lever gear (1) is mounted on one side of the crossbeam (6b). The lever gear (1) includes a lever disc (1a) with a lever tooth (1b) on the side of the lever disc (1a). The lever tooth (1b) meshes with the pulley (4). This structure is more reliable and compact.

[0014] Compared with the prior art, the beneficial effects of this utility model are as follows: 1. The adoption of the bracket installation method and the advantages of the gantry bracket installation benchmark reduce the cumulative installation error, make the positioning more accurate and reliable, improve the transmission engagement effect, and make the snap-fit ​​structure more convenient and quick, thereby greatly improving the sealing performance of the gas meter and improving the metering accuracy; 2. The design of the center hole of the valve cover solves the problem of poor sealing caused by large inner ring deformation in the prior art, and greatly improves the metering accuracy of the gas meter. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of this utility model;

[0016] Figure 2 for Figure 1Top view;

[0017] Figure 3 for Figure 2 BB section view in the middle;

[0018] Figure 4 for Figure 3 Enlarged diagram of part A in the image. Detailed Implementation

[0019] The present invention will be further described below with reference to the embodiments and accompanying drawings.

[0020] like Figures 1 to 3 As shown, a diaphragm gas meter transmission structure comprises a gas outlet pipe 2, a metering housing 3, a valve grille 10, and a valve cover 9. The valve grille 10 is mounted on the metering housing 3 via a valve shaft 3a. The valve cover 9 is mounted above the valve grille 10. A portal frame 6 is mounted on the valve grille 10, with its side frames 6a fixed to both sides of the valve grille 10 and its cross frame 6b located above the valve cover 9. A lever gear 1 and a crank gear 7 are mounted on the portal frame 6. The crank gear 4 is mounted on the cross frame 6b via a support shaft 4a, which is integrally formed on the cross frame 6b. The crank gear 4 is a gear structure fitted onto the support shaft 4a. The lever gear 1 and the crank gear 4 mesh. A connecting shaft 7a is installed in the central hole 9a of the valve cover 9, with its upper part extending out of the central hole 9a. The crank gear 7 is fixedly fitted at the extended end of the connecting shaft 7a.

[0021] Please see Figure 3 The central hole 9a is located at the center of the valve cover 9, and the lower end of the central hole 9a is closed. The contact surface between the valve cover 9 and the valve gate 10 forms an outer ring and a middle ring sealing surface. The lower end surface of the central hole 9a is lower than the sealing surface of the valve cover 9, thereby leaving a gap between the lower end surface of the central hole 9a and the inner ring of the valve gate 10.

[0022] Figure 3 It can be seen that the crank gear 7 includes an upper connecting disc 7b, a middle meshing tooth portion 7c, and a lower connecting shaft 7a. The connecting disc 7b, the meshing tooth portion 7c, and the connecting shaft 7a are integrally formed. The meshing tooth portion 7c meshes with the passing wheel 4. The upper part of the connecting shaft 7a is rotatably supported on the cross frame 6b, and the lower part is elastically engaged with the bottom of the central hole 9a.

[0023] Figure 3 and Figure 4In the crossbeam 6b, a connecting shaft mounting post 6b1 is integrally formed on the crossbeam 6b. The connecting shaft mounting post 6b1 extends downward into the central hole 9a, and its lower end is higher than the bottom of the central hole 9a. The connecting shaft 7a passes through the axially formed hole in the connecting shaft mounting post 6b1 and engages with the central hole 9a. The outer wall of the connecting shaft mounting post 6b1 is wider at the top and narrower at the bottom. The inner wall of the central hole 9a is adapted to the structure of the outer wall of the connecting shaft mounting post 6b1. The rotation of the crank gear drives the connecting shaft 7a to rotate, thereby allowing the valve cover 9 with the central hole 9a to be fitted and rotated on the connecting shaft mounting post 6b1. The connecting shaft 7a, the central hole 9a, and the connecting shaft mounting post 6b1 have good concentricity and reliable rotation.

[0024] Combination Figure 2 and Figure 3 It can be seen that the lever gear 1 is installed on one side of the cross frame 6b. The lever gear 1 includes a lever disc 1a, and a lever tooth 1b is provided on the side of the lever disc 1a. The lever tooth 1b meshes with the guide wheel 4.

[0025] Finally, it should be noted that the above description is merely a preferred embodiment of the present utility model. Those skilled in the art, under the guidance of the present utility model, can make various similar representations without departing from the spirit and claims of the present utility model, and such modifications all fall within the protection scope of the present utility model.

Claims

1. A diaphragm gas meter transmission structure, comprising a metering housing (3) and a valve grille (10) mounted on the metering housing (3), wherein a valve cover (9) is mounted above the valve grille (10), characterized in that: A gantry bracket (6) is installed on the valve grille (10). The side frame (6a) of the gantry bracket (6) is fixed on the valve grille (10). The cross frame (6b) of the gantry bracket (6) is located above the valve cover (9). A lever gear (1), a pass wheel (4), and a crank gear (7) are installed on the gantry bracket (6). The pass wheel (4) is installed on the cross frame (6b) via a support shaft (4a). The lever gear (1) and the pass wheel (4) mesh. A connecting shaft (7a) is installed in the central hole (9a) of the valve cover (9). The upper part of the connecting shaft (7a) extends out of the central hole (9a). The crank gear (7) is fixedly sleeved at the extended end of the connecting shaft (7a). The pass wheel (4) and the crank gear (7) mesh.

2. The diaphragm gas meter transmission structure according to claim 1, characterized in that: The central hole (9a) is located at the center of the valve cover (9), and the lower end of the central hole (9a) is closed.

3. The diaphragm gas meter transmission structure according to claim 2, characterized in that: The contact surfaces of the valve cover (9) and the valve gate (10) form an outer ring and a middle ring sealing surface, and the lower end face of the central hole (9a) is lower than the sealing surface of the valve cover (9).

4. A diaphragm gas meter transmission structure according to claim 1, 2, or 3, characterized in that: The crank gear (7) includes an upper connecting disc (7b), a middle meshing tooth portion (7c), and a lower connecting shaft (7a). The connecting disc (7b), the meshing tooth portion (7c), and the connecting shaft (7a) are integrally formed, and the meshing tooth portion (7c) meshes with the drive gear (4).

5. The diaphragm gas meter transmission structure according to claim 4, characterized in that: The upper part of the connecting shaft (7a) is rotatably supported on the cross frame (6b), and the lower part is elastically engaged with the bottom of the central hole (9a).

6. The diaphragm gas meter transmission structure according to claim 5, characterized in that: A connecting shaft mounting post (6b1) is provided on the cross frame (6b). The connecting shaft mounting post (6b1) extends downward into the center hole (9a), and the lower end of the connecting shaft mounting post (6b1) is higher than the bottom of the center hole (9a). The connecting shaft (7a) passes through the connecting shaft mounting post (6b1) and engages with the center hole (9a).

7. The diaphragm gas meter transmission structure according to claim 6, characterized in that: The outer wall of the connecting shaft mounting hole post (6b1) is larger at the top and smaller at the bottom, and the inner wall of the central hole (9a) is adapted to the structure of the outer wall of the connecting shaft mounting hole post (6b1).

8. A diaphragm gas meter transmission structure according to claim 1 or 2, characterized in that: The lever gear (1) is installed on one side of the cross frame (6b). The lever gear (1) includes a dial (1a) with a dial tooth (1b) on the side of the dial (1a). The dial tooth (1b) meshes with the pulley (4).

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