Diaphragm gas meter transmission structure

Abstract

The invention 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] The present invention relates to the technical field of gas meters, and in particular to a transmission structure of a diaphragm gas meter. Background Art

[0002] The diaphragm gas meter is a flow meter for measuring combustible gases. The gas enters the metering chamber from the air inlet, pushing the diaphragm to swing freely. The movement of the diaphragm assembly drives the connecting rod mechanism through the rocker and causes the valve cover to rotate, thereby controlling the filling and exhaust of each metering chamber in sequence, making the gas meter move in a continuous cycle. At the same time, the eccentric transmission crank gear of the connecting rod mechanism drives the lever gear through the pass wheel, and the lever gear drives the counter to count. Finally, the gas volume of the gas meter is displayed through the counter, thereby achieving the purpose of measuring gas flow.

[0003] The existing diaphragm gas meter has a lever gear, a pulley and a crank gear mounted on a metering housing, so there are several mounting references such as the metering housing and the valve grid, resulting in a large cumulative error, which affects the sealing of the diaphragm gas meter; at the same time, since the crank gear is directly supported on the valve shaft, the three sealing lines on the valve cover and the valve grid (i.e., the inner ring, the middle ring, and the outer ring) ensure the sealing of each chamber of the movement during the rotation of the valve cover; but since the valve grid and the valve cover are plastic parts, they will undergo a certain degree of deformation during long-term storage or use, resulting in poor sealing of the valve grid and the valve cover, which in turn affects the metering accuracy of the gas meter. Summary of the invention

[0004] In order to solve the above technical problems, the present invention provides a diaphragm gas meter with good sealing performance and accurate measurement.

[0005] The technical solution is as follows: a diaphragm gas meter transmission structure comprises a metering housing (3) and a valve grid (10) mounted on the metering housing (3), a valve cover (9) being mounted above the valve grid (10), and the main points are: a gate-type bracket (6) is mounted on the valve grid (10), a side frame (6a) of the gate-type bracket (6) is fixed on the valve grid (10), a cross frame (6b) of the gate-type bracket (6) is located above the valve cover (9), and a valve cover (9) is mounted on the gate-type bracket (6). The invention discloses a lever gear (1), a wheel (4) and a crank gear (7), wherein the wheel (4) is mounted on the horizontal frame (6b) via a support shaft (4a), the lever gear (1) and the wheel (4) are meshed, a connecting shaft (7a) is mounted 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 on the extended end of the connecting shaft (7a), and the wheel (4) and the crank gear (7) are meshed. With the above structure, after the gate-type bracket is provided, the gate-type bracket is directly supported on the valve grid, avoiding the bracket being directly mounted on the metering housing, thereby reducing the cumulative error when installing the valve grid and the valve cover and other components. At the same time, since the lever gear, the wheel and the crank gear are directly mounted on the gate-type bracket, the valve cover only has a rotation relationship and no support relationship, so the inner ring, the middle ring and the outer ring of the valve grid sealed therewith will not be deformed, thereby greatly improving the sealing performance and providing metering accuracy.

[0006] Preferably, the center hole (9a) is arranged at the center position of the valve cover (9), and the lower end of the center hole (9a) is closed. In the prior art, the lower end surface of the center hole is the inner ring sealing line of the valve cover. In the above structure, the inner ring of the original valve cover is eliminated, and the lower end surface of the center hole of the valve cover will not contact the inner ring of the valve grid, so that the gas will not leak from the center hole due to the deformation of the inner ring of the valve grid, thereby greatly improving the sealing performance.

[0007] Preferably, the contact surface between the valve cover (9) and the valve grid (10) forms an outer ring and a middle ring sealing surface, and the lower end surface of the center hole (9a) is lower than the sealing surface of the valve cover (9). In the prior art, the valve cover and the valve grid are sealed by the outer ring, the middle ring and the inner ring corresponding to each other, and the inner ring is deformed greatly during long-term use, thereby greatly reducing the sealing performance of the valve cover and the valve grid, thereby affecting the metering accuracy of the gas meter. In the above structure, the lower end surface of the center hole does not contact the valve grid, and there will be no deformation due to long-term contact, thereby improving the sealing performance.

[0008] Preferably, the crank gear (7) comprises an upper connecting disk (7b), a meshing tooth portion (7c) in the middle and a connecting shaft (7a) at the bottom; the connecting disk (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); such a structure makes the installation of the crank gear more reliable.

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

[0010] Preferably, a connecting shaft mounting hole column (6b1) is provided on the cross frame (6b), the connecting shaft mounting hole column (6b1) extends downward into the center hole (9a), and the lower end of the connecting shaft mounting hole column (6b1) is higher than the bottom of the center hole (9a), and the connecting shaft (7a) is connected to the center hole (9a) after passing through the connecting shaft mounting hole column (6b1).

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

[0012] The design of the above structure, due to the existence of the connecting shaft mounting hole column, especially the innovative design of the outer wall of the connecting shaft mounting hole column, makes the rotation concentricity of the center hole of the valve cover, the connecting shaft of the crank gear and the connecting shaft mounting hole column better when the valve cover rotates, and the rotation of the valve cover is smoother and the sealing is better.

[0013] Preferably, the lever gear (1) is mounted on one side of the cross frame (6b), the lever gear (1) comprises a shifting plate (1a), a shifting tooth portion (1b) is arranged on the side of the shifting plate (1a), and the shifting tooth portion (1b) is meshed with the passing wheel (4), so that the structure is more reliable and compact.

[0014] Compared with the prior art, the present invention has the following beneficial effects: 1. The bracket installation method is adopted, and the advantages of the door-type bracket installation reference reduce the cumulative error of the installation, and the positioning is more accurate and reliable, the transmission engagement effect is better, and the snap-on structure is more convenient and quick, thereby greatly improving the sealing performance of the gas meter and the metering accuracy; 2. The center hole design of the valve cover solves the problem of poor sealing caused by large deformation of the inner ring in the prior art, and the metering accuracy of the gas meter is greatly improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of the present invention;

[0016] Figure 2 for Figure 1 A top view of

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

[0018] Figure 4 for Figure 3 A magnified schematic diagram of part A in FIG. DETAILED DESCRIPTION

[0019] The present invention is further described below in conjunction with embodiments and drawings.

[0020] like Figures 1 to 3 As shown, the transmission structure of the diaphragm gas meter is composed of components such as an outlet pipe 2, a metering housing 3, a valve grid 10 and a valve cover 9, wherein the valve grid 10 is installed on the metering housing 3 via a valve shaft 3a, a valve cover 9 is installed above the valve grid 10, a gate-type bracket 6 is installed on the valve grid 10, the side frames 6a of the gate-type bracket 6 are fixed on both sides of the valve grid 10, the cross frame 6b of the gate-type bracket 6 is located above the valve cover 9, and a lever gear 1 and a crank gear 7 of a wheel 4 are installed on the gate-type bracket 6, wherein the wheel 4 is installed on the cross frame 6b via a support shaft 4a, and the support shaft 4a is integrally formed on the cross frame 6b, the wheel 4 is a gear structure, which is sleeved on the support shaft 4a, the lever gear 1 and the wheel 4 are meshed, and a connecting shaft 7a is installed in the center hole 9a of the valve cover 9, the upper part of the connecting shaft 7a protrudes from the center hole 9a, and the crank gear 7 is fixedly sleeved on the protruding end of the connecting shaft 7a.

[0021] See also Figure 3 The center hole 9a is arranged at the center position of the valve cover 9, and the lower end of the center hole 9a is closed. The contact surface between the valve cover 9 and the valve grid 10 forms an outer ring and a middle ring sealing surface. The lower end surface of the center hole 9a is lower than the sealing surface of the valve cover 9, so that a gap is left between the lower end surface of the center hole 9a and the inner ring of the valve grid 10.

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

[0023] Figure 3 and Figure 4Middle: A connecting shaft mounting hole column 6b1 is provided on the cross frame 6b, and the connecting shaft mounting hole column 6b1 is integrally formed on the cross frame 6b. The connecting shaft mounting hole column 6b1 extends downward into the center hole 9a, and the lower end of the connecting shaft mounting hole column 6b1 is higher than the bottom of the center hole 9a. The connecting shaft 7a passes through the hole opened along the axial direction of the connecting shaft mounting hole column 6b1 and then engages with the center hole 9a. The upper part of the outer wall of the connecting shaft mounting hole column 6b1 is large and the lower part is small. The inner wall of the center hole 9a is adapted to the outer wall structure of the connecting shaft mounting hole column 6b1. The crank gear rotates to drive the connecting shaft 7a to rotate, so that the valve cover 9 with the center hole 9a is mounted on the connecting shaft mounting hole column 6b1 and rotates. The connecting shaft 7a, the center hole 9a and the connecting shaft mounting hole column 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 6 b , and the lever gear 1 includes a shifting plate 1 a , and a shifting tooth portion 1 b is provided on the side of the shifting plate 1 a , and the shifting tooth portion 1 b is meshed with the overwheel 4 .

[0025] Finally, it should be noted that the above description is only a preferred embodiment of the present invention. Under the guidance of the present invention, ordinary technicians in this field can make various similar expressions without violating the purpose and claims of the present invention, and such changes all fall within the scope of protection of the present invention.

Claims

1. A diaphragm gas meter transmission structure, comprising a metering housing (3) and a valve grid (10) mounted on the metering housing (3), a valve cover (9) mounted above the valve grid (10), characterized in that: A gate-shaped bracket (6) is mounted on the valve grid (10), a side frame (6a) of the gate-shaped bracket (6) is fixed on the valve grid (10), a cross frame (6b) of the gate-shaped bracket (6) is located above the valve cover (9), a lever gear (1), a wheel (4) and a crank gear (7) are mounted on the gate-shaped bracket (6), wherein the wheel (4) is mounted on the cross frame (6b) via a support shaft (4a), the lever gear (1) and the wheel (4) are meshed, a connecting shaft (7a) is mounted in the center hole (9a) of the valve cover (9), the upper part of the connecting shaft (7a) protrudes from the center hole (9a), the crank gear (7) is fixedly sleeved on the protruding end of the connecting shaft (7a), and the wheel (4) and the crank gear (7) are meshed.

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

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

4. The diaphragm gas meter transmission structure according to claim 1, 2 or 3, characterized in that: The crank gear (7) comprises an upper connecting disk (7b), a meshing tooth portion (7c) in the middle, and a connecting shaft (7a) at the bottom; the connecting disk (7b), the meshing tooth portion (7c), and the connecting shaft (7a) are integrally formed; and the meshing tooth portion (7c) meshes with the passing wheel (4).

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

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

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

8. The diaphragm gas meter transmission structure according to claim 1 or 2, characterized in that: The lever gear (1) is mounted on one side of the cross frame (6b), and the lever gear (1) comprises a shifting plate (1a), a shifting tooth portion (1b) is arranged on the side of the shifting plate (1a), and the shifting tooth portion (1b) is meshed with the passing wheel (4).

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