Diaphragm type gas meter

Abstract

The invention discloses a diaphragm gas meter 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 n-shaped support, the third wheel is installed on the transverse frame through a supporting shaft, and a non-return structure is arranged between the third wheel and the transverse frame. The problem that an existing non-return structure is loud in sound is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of gas meters, and in particular to 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 non-return structure arranged between the lever gear and the bracket. When the lever gear rotates, a loud abnormal noise is generated. At the same time, the bracket for installing the lever gear, the pulley and the crank gear of the existing diaphragm gas meter is installed on the metering housing. Therefore, there are several installation references such as the metering housing and the valve grid, which cause a large cumulative error, thereby affecting 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. However, 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, thereby affecting 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 scheme is as follows: a diaphragm gas meter 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 characterized in that 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), a lever gear (1), a passing wheel (4) and a crank gear (7) are mounted on the gate-type bracket (6), the passing wheel (4) is mounted on the cross frame (6b) via a support shaft (4a), and a non-return structure is arranged between the passing wheel (4) and the cross frame (6b).

[0006] Preferably, the anti-return structure comprises a stopper (4a) arranged on one side of the passing wheel (4) close to the cross frame (6b), the stopper (4a) being an involute structure, a slide groove (6c) being arranged on the cross frame (6b), a slider (11) being arranged in the slide groove (6c), a anti-return column (11a) being arranged on the slider (11), and when the passing wheel (4) rotates in the reverse direction, the anti-return column (11a) can clamp the stopper (4a).

[0007] Preferably, a strip-shaped hole is opened in the middle of the slider (11), the support shaft (4a) protrudes outward from the strip-shaped hole, and there are two check columns (11a), which are respectively located on both sides of the support shaft (4a).

[0008] By adopting the above-mentioned anti-return structure, when the wheel (4) rotates in the forward direction, the outer arc portion of its stop portion (4a) contacts the anti-return column, pushing the slider to move in the slide groove without hindering the rotation of the wheel. When the wheel (4) rotates in the reverse direction, the inner side of the stop portion (4a) will be stuck on the anti-return column, thereby preventing the reverse rotation of the wheel. This structure solves the problem of loud noise of the existing anti-return structure.

[0009] As a preferred embodiment, the lever gear (1) and the wheel (4) are meshed, 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 on the extended end of the connecting shaft (7a), the wheel (4) and the crank gear (7) are meshed, the center hole (9a) is set at the center position of the valve cover (9), and the lower end of the center hole (9a) is closed. With the above structure, after the gate-type bracket is set, the gate-type bracket is directly supported on the valve grid, avoiding the bracket being directly installed 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 installed 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 with it will not be deformed, which greatly improves the sealing performance and provides metering accuracy. 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, which will not cause gas leakage from the center hole due to deformation of the inner ring of the valve grid, thereby greatly improving the sealing performance.

[0010] 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.

[0011] 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.

[0012] 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).

[0013] 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).

[0014] 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).

[0015] 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.

[0016] 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.

[0017] Compared with the prior art, the present invention has the following beneficial effects: 1. It solves the problem of loud noise in the existing check structure; 2. It adopts the installation method of the bracket and the advantage of the door-type bracket installation reference, which reduces the cumulative error of the installation, makes the positioning more accurate and reliable, and the transmission engagement effect is better. The snap-on structure is more convenient and quick, thereby greatly improving the sealing performance of the gas meter and the metering accuracy; 3. 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

[0018] Figure 1 It is a structural schematic diagram of the present invention;

[0019] Figure 2 for Figure 1 A top view of

[0020] Figure 3 for Figure 2 BB section view in;

[0021] Figure 4 for Figure 3 The enlarged schematic diagram of part A in the middle;

[0022] Figure 5 It is a structural schematic diagram of the non-return structure on the passing wheel 4;

[0023] Figure 6 It is a schematic diagram of the anti-return structure on the door-type bracket 6. DETAILED DESCRIPTION

[0024] The present invention is further described below in conjunction with embodiments and drawings.

[0025] like Figures 1 to 6 As shown, a diaphragm gas meter transmission structure is composed of an outlet pipe 2, a metering housing 3, a valve grid 10, a valve cover 9 and a check structure, 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, side frames 6a of the gate-type bracket 6 are fixed on both sides of the valve grid 10, a cross frame 6b of the gate-type bracket 6 is located above the valve cover 9, 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, 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, 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.

[0026] See also Figure 3The 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.

[0027] 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.

[0028] Figure 3 and Figure 4 Middle: 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.

[0029] 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 passing wheel 4 .

[0030] Combination Figure 2 , Figure 5 and Figure 6It can be seen that: the non-return structure includes a stopper 4a arranged on one side of the wheel 4 close to the cross frame 6b, the stopper 4a is an involute structure, a slide groove 6c is arranged on the cross frame 6b, a slider 11 is arranged in the slide groove 6c, a non-return column 11a is arranged on the slider 11, and when the wheel 4 rotates in the reverse direction, the non-return column 11a can clamp the stopper 4a; a strip hole is opened in the middle of the slider 11, the support shaft 4a extends outward from the strip hole, there are two non-return columns 11a, which are respectively located on both sides of the support shaft 4a, and the non-return column 11a and the slider 11 are integrally formed.

[0031] 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, 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 passing wheel (4) and a crank gear (7) are mounted on the gate-shaped bracket (6); the passing wheel (4) is mounted on the cross frame (6b) via a support shaft (4a); and a non-return structure is provided between the passing wheel (4) and the cross frame (6b).

2. A diaphragm gas meter according to claim 1, characterized in that: The anti-return structure comprises a stopper (4a) arranged on one side of the passing wheel (4) close to the cross frame (6b), the stopper (4a) being an involute structure, a slide groove (6c) being arranged on the cross frame (6b), a slider (11) being arranged in the slide groove (6c), and an anti-return column (11a) being arranged on the slider (11), and when the passing wheel (4) rotates in the reverse direction, the anti-return column (11a) can clamp the stopper (4a).

3. A diaphragm gas meter according to claim 2, characterized in that: A strip-shaped hole is opened in the middle of the slider (11), and the support shaft (4a) extends outward from the strip-shaped hole. There are two anti-return columns (11a), which are respectively located on both sides of the support shaft (4a).

4. A diaphragm gas meter according to claim 1, 2 or 3, characterized in that: The lever gear (1) is meshed with the overwheel (4); 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 on the extended end of the connecting shaft (7a); the overwheel (4) is meshed with the crank gear (7); 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.

5. A diaphragm gas meter according to claim 4, 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).

6. A diaphragm gas meter according to claim 4, 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).

7. A diaphragm gas meter according to claim 6, 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).

8. The transmission structure of a diaphragm gas meter according to claim 7, 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).

9. A diaphragm gas meter according to claim 8, 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).

10. A diaphragm gas meter according to claim 4, 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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