Gas meter structure with higher metering precision

Abstract

The utility model relates to a gas meter structure with higher metering precision, which comprises a metering valve body, a gas inlet and a gas outlet, a plurality of metering chambers are arranged on the outer side of the metering valve body, metering diaphragms are arranged in the metering chambers, and the gas pressure difference of the gas inlet and the gas outlet on the metering chambers can extrude the metering diaphragms to move. A diaphragm clamping piece is clamped on the metering diaphragm, one side of the diaphragm clamping piece is in transmission connection with a rocker arm, the interior of the rocker arm is connected with one end of a vertical shaft, the surface of the vertical shaft is rotatably arranged in the metering valve body, and the other end of the vertical shaft is integrally connected with a traction arm; the vertical shaft and the traction arm are of an integrated structure, the vertical shaft and the traction arm only need to be subjected to one-time extrusion forming through an injection mold, the motion relation between the vertical shaft and the traction arm cannot be changed, the consistency is good, the vertical shaft and the traction arm cannot slip after being used for a long time, and the whole metering precision is in the best level.

Description

Technical Field

[0001] The utility model relates to the technical field of gas meters, in particular to a gas meter structure with higher metering accuracy. Background Art

[0002] There are two metering chambers in the diaphragm gas meter, each of which is equipped with a diaphragm. The thrust of the diaphragm movement depends on the gas pressure difference at the inlet and outlet of the gas meter. When the measured gas enters a metering chamber, the pressure generated pushes the diaphragm to move to the other side and generates a thrust (that is, the torque of the vertical shaft rotation driven by the diaphragm). When the diaphragm moves to the extreme position on the other side, the torque no longer generates the force to return the diaphragm, and the diaphragm in the second metering chamber must generate the same force to drive the previous diaphragm to return, and through the rocker and connecting rod to drive a common crank shaft to rotate continuously, and it drives the rotary valve to change the direction of the inlet and outlet and drive the counting device to achieve the purpose of continuous automatic metering.

[0003] The application announcement number is CN109341789A, which discloses a diaphragm gas meter. Combined with its specification and drawings, the rocker and the vertical shaft in its scheme are not connected in an integrated manner. This connection structure is often that the vertical shaft is a metal part, and the rocker is a plastic part. The vertical shaft is fixedly inserted into the inside of the rocker so that transmission can be achieved between the two. However, with this fixing method, firstly, the rigid fit between the plastic part and the metal makes the rocker of the plastic part have the risk of cracking. Therefore, when encountering cold weather in winter, the rocker will accelerate the progress of this cracking, thereby affecting the transmission relationship between the vertical shaft and the rocker, and affecting the measurement accuracy of the diaphragm gas meter. Summary of the invention

[0004] The utility model mainly aims at the problems existing in the operation of the above-mentioned gas meter and invents a gas meter structure with higher metering accuracy. The vertical shaft and the pulling arm are an integrated structure. The vertical shaft and the pulling arm only need to be extruded once through an injection mold, so that the movement relationship between the vertical shaft and the pulling arm will not change, and the consistency is very good. The vertical shaft and the pulling arm will not slip during long-term use, so that the entire metering accuracy can be at an optimal level. In low temperature conditions such as winter, the integrated design can also prevent cracks between the vertical shaft and the pulling arm.

[0005] The inventive objective of the utility model is achieved through the following technical solutions: a gas meter structure with higher metering accuracy, comprising a metering valve body, a plurality of air inlets and exhaust ports arranged on the surface of the metering valve body, a plurality of metering chambers arranged on the outer side of the metering valve body, a metering diaphragm arranged inside each metering chamber, the gas pressure difference between the air inlet and the exhaust port on the metering chamber can squeeze the metering diaphragm to move, a diaphragm clamping piece is clamped on the metering diaphragm, one side of the diaphragm clamping piece is transmission-connected to a rocker arm, the interior of the rocker arm is connected to one end of a vertical shaft, the surface of the vertical shaft is rotatably arranged inside the metering valve body, the other end of the vertical shaft is integrally connected with a pulling arm, the pulling arm is transmission-connected to an external metering transmission mechanism, the pulling arm can drive the metering transmission mechanism to measure the changes in the inlet and outlet of the gas inside the metering chamber.

[0006] Preferably, a first through hole is provided on the surface of the metering valve body, and the vertical shaft is rotatably connected inside the first through hole.

[0007] Preferably, one end of the vertical shaft is fixedly inserted into the interior of the rocker arm, and the cross-section of the end face is a polygon.

[0008] Preferably, one end of the vertical shaft is fixedly inserted into the interior of the rocker arm, and the cross-section of the end face is a triangle, a quadrilateral, a hexagon, or an octagon.

[0009] Preferably, the diaphragm clamping member includes a first clamping plate and a second clamping plate, a diaphragm fixing shaft is provided on one side of the second clamping plate, a rectangular slide groove is provided on the other side of the second clamping plate, the rocker arm transmission is connected inside the rectangular slide groove, a diaphragm fixing through hole is provided on the surface of the first clamping plate, and the diaphragm fixing shaft and the diaphragm fixing through hole can clamp the metering diaphragm when matched.

[0010] Preferably, a cylindrical boss is provided at one end of the rocker arm, and the cylindrical boss can be slidably connected to the inside of a rectangular slide groove, the length of the rectangular slide groove is greater than the sliding length of the cylindrical boss, and a second through hole is provided at the other end of the rocker arm, the cross-sectional shape of the second through hole is adapted to the cross-sectional shape of the end of the vertical shaft, and the vertical shaft is fixedly connected to the inside of the second through hole.

[0011] Preferably, a plurality of first cavities are provided on the surface of the metering valve body, a valve body cover is provided outside each of the first cavities, a second cavity is provided inside each of the valve body cover plates, and the first cavity and the second cavity constitute the metering chamber.

[0012] Preferably, the vertical shaft and the pulling arm are both made of plastic material, and this arrangement is to make the vertical shaft and the pulling arm an integrated design.

[0013] Compared with the prior art, the utility model has the following beneficial effects: 1. The vertical shaft and the pulling arm are an integrated structure, so the vertical shaft and the pulling arm only need to be extruded and formed once by an injection mold, and there is no need for metal machining of the traditional vertical shaft like traditional products, and the processed aluminum vertical shaft is inserted into the inside of the pulling arm. Therefore, this design also reduces the production cost, and the installation between the vertical shaft and the pulling arm is further reduced during the installation process, thereby improving the production efficiency and reducing the production cost of the enterprise. Moreover, this integrated design makes the movement relationship between the vertical shaft and the pulling arm unchanged, and the consistency is very good. The vertical shaft and the pulling arm will not slip during long-term use, so that the entire metering accuracy can be at an optimal level. In low temperature conditions such as winter, the integrated design can also prevent the vertical shaft and the pulling arm from cracking, thereby increasing the service life of the product; 2. The end of the vertical shaft is fixedly plugged into the inside of the rocker arm, and the cross-section of the end face is a polygon. The use of this plug-in structure has good stability, simple structure, and is easy to produce and install. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a three-dimensional diagram of the utility model;

[0015] Figure 2 It is an exploded view of the utility model;

[0016] Figure 3 It is an exploded view of the utility model;

[0017] Figure 4 It is an exploded view of the utility model;

[0018] Figure 5 It is a schematic diagram of the end face of the vertical shaft of the utility model after adjustment;

[0019] Figure 6 It is a schematic diagram of the end face of the vertical shaft of the utility model after adjustment.

[0020] Markings in the figure: 1, metering valve body; 11, air inlet; 12, exhaust port; 13, first through hole; 14, first cavity; 3, metering chamber; 4, metering diaphragm; 5, diaphragm clamping member; 51, first clamping plate; 52, second clamping plate; 511, diaphragm fixing through hole; 521, diaphragm fixing shaft; 522, rectangular slide groove; 6, rocker arm;

[0021] 61. cylindrical boss; 62. second through hole; 7. vertical shaft; 71. pulling arm; 8. valve body cover plate; 81. second cavity. DETAILED DESCRIPTION

[0022] The present invention will be further described below with reference to the embodiments shown in the accompanying drawings:

[0023] like Figures 1 to 4As shown, a gas meter structure with higher metering accuracy comprises a metering valve body 1, a plurality of air inlets 11 and air outlets 12 arranged on the surface of the metering valve body 1, two metering chambers 3 are arranged on the outer side of the metering valve body 1, specifically, a plurality of first chambers 14 are arranged on the surface of the metering valve body 1, a valve body cover plate 8 is arranged on the outer side of each of the first chambers 14, a second chamber 81 is arranged on the inner side of each of the valve body cover plates 8, the first chamber 14 and the second chamber 81 constitute the metering chamber 3, a metering diaphragm 4 is arranged on the inner side of each metering chamber 3, the metering diaphragm 4 separates each metering chamber 3 into two left and right areas, the gas pressure difference between the air inlet 11 and the air outlet 12 on the metering chamber 3 can change the gas pressure difference between the left and right areas of the metering chamber 3, thereby squeezing the metering diaphragm 4 to move, a diaphragm clamping member 5 is clamped on the metering diaphragm 4, one side of the diaphragm clamping member 5 is transmission-connected to the rocker arm 6, specifically, the diaphragm clamping member The component 5 includes a first clamping plate 51 and a second clamping plate 52. The surface of the first clamping plate 51 is provided with a diaphragm fixing through hole 511. The diaphragm fixing shaft 521 and the diaphragm fixing through hole 511 can clamp the metering diaphragm 4 after cooperation. A diaphragm fixing shaft 521 is provided on one side of the second clamping plate 52, and a rectangular slide groove 522 is provided on the other side of the second clamping plate 52. The rocker arm 6 is transmission connected to the inside of the rectangular slide groove 522. One end of the rocker arm 6 is provided with a cylindrical boss 61. The cylindrical boss 61 can be slidably connected to the inside of the rectangular slide groove 522. The length of the rectangular slide groove 522 is greater than the sliding length of the cylindrical boss 61. After such arrangement, whenever the metering diaphragm 4 is subjected to the driving force generated by the change in the gas pressure difference between the left and right areas of the metering chamber 3, since the metering diaphragm 4 is made of soft material, the metering diaphragm 4 can be deformed. During the deformation process, the cylindrical boss 61 slides inside the rectangular slide groove 522, so that the rocker arm 6 changes its angle and rotates.

[0024] In this embodiment, the other end of the rocker arm 6 is provided with a second through hole 62, and the cross-sectional shape of the second through hole 62 is adapted to the cross-sectional shape of the bottom end of the vertical shaft 7. The vertical shaft 7 is fixedly connected to the inside of the second through hole 62. It should be noted that the surface of the metering valve body 1 is provided with a first through hole 13, and the vertical shaft 7 is rotatably connected to the inside of the first through hole 13. The other end of the vertical shaft 7 is integrally connected with a pulling arm 71, and the pulling arm 71 is transmission-connected to an external metering transmission mechanism. The pulling arm 71 can drive the metering transmission mechanism to measure the inlet and outlet changes of the gas inside the metering chamber 3. The vertical shaft 7 and the pulling arm 71 are both made of plastic material, so that the vertical shaft 7 and the pulling arm 71 only need to be extruded once by an injection mold without the need for Like traditional products, an aluminum vertical shaft 7 is inserted into the interior of the pulling arm 71. Such an integrated design ensures that the movement relationship between the vertical shaft 7 and the pulling arm 71 will not change, and the consistency is very good. The vertical shaft 7 and the pulling arm 71 will not slip during long-term use, so that the entire metering accuracy is at an optimal level, which increases the service life of the product. In addition, in low temperature conditions such as winter, the integrated design can also prevent cracks between the vertical shaft 7 and the pulling arm 71. Secondly, only one injection molding is required during processing, while the traditional vertical shaft 7 still requires metal machining. Such a design also reduces production costs. The installation between the vertical shaft 7 and the pulling arm 71 is further eliminated during the installation process, thereby improving production efficiency and reducing the production cost of the enterprise.

[0025] In this embodiment, the bottom end of the vertical shaft 7 is fixedly inserted into the interior of the rocker arm 6, and the cross-section of the end face is a polygon, and the quadrilateral used in this embodiment is as follows: Figure 5 and Figure 6 As shown, the bottom end of the vertical shaft 7 is fixedly inserted into the interior of the rocker arm 6, and the polygon of the cross section of the end face is a triangle or a pentagon. In other embodiments, the polygon of the cross section of the end face can be a hexagon or an octagon. It should be noted that no matter what shape of polygon the bottom end of the vertical shaft 7 is, the cross-sectional shape of the second through hole 62 is adapted to the cross-sectional shape of the bottom end of the vertical shaft 7.

[0026] Working principle and usage of this utility model:

[0027] The gas pressure difference between the air inlet 11 and the air outlet 12 on the metering chamber 3 can cause the gas pressure difference between the left and right areas of the metering chamber 3 to change. Whenever the metering diaphragm 4 is subjected to the driving force generated by the change in the gas pressure difference between the left and right areas of the metering chamber 3, since the metering diaphragm 4 is made of soft material, the metering diaphragm 4 can be deformed. During the deformation process, the cylindrical boss 61 slides inside the rectangular slide groove 522, so that the rocker arm 6 changes its angle and rotates. During the rotation of the rocker arm 6, the vertical shaft 7 and the pulling arm 71 are driven to rotate. When the pulling arm 71 rotates, it drives the external metering transmission mechanism, thereby measuring the changes in the inlet and outlet of the gas inside the metering chamber 3, wherein the rotation accuracy of the vertical shaft 7 and the pulling arm 71 affects the subsequent measurement accuracy.

[0028] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. A gas meter structure with higher metering accuracy, comprising a metering valve body (1), a plurality of gas inlets (11) and gas outlets (12) arranged on the surface of the metering valve body (1), characterized in that: A plurality of metering chambers (3) are provided on the outside of the metering valve body (1), and a metering diaphragm (4) is provided inside each metering chamber (3). The gas pressure difference between the gas inlet (11) and the gas outlet (12) on the metering chamber (3) can squeeze the metering diaphragm (4) to cause it to move. A diaphragm clamp (5) is clamped on the metering diaphragm (4), and one side of the diaphragm clamp (5) is transmission-connected to a rocker arm (6). The inside of the rocker arm (6) is connected to one end of a vertical shaft (7). The surface of the vertical shaft (7) is rotatably arranged inside the metering valve body (1). The other end of the vertical shaft (7) is integrally connected to a pulling arm (71), and the pulling arm (71) is transmission-connected to an external metering transmission mechanism. The pulling arm (71) can drive the metering transmission mechanism to measure the changes in the inlet and outlet of the gas inside the metering chamber (3).

2. The gas meter structure with higher measurement accuracy according to claim 1 is characterized in that: A first through hole (13) is provided on the surface of the metering valve body (1), and the vertical shaft (7) is rotatably connected inside the first through hole (13).

3. The gas meter structure with higher measurement accuracy according to claim 2 is characterized in that: One end of the vertical shaft (7) is fixedly inserted into the interior of the rocker arm (6), and the cross-section of this end of the vertical shaft (7) is a polygon.

4. The gas meter structure with higher measurement accuracy according to claim 3 is characterized in that: The diaphragm clamping member (5) comprises a first clamping plate (51) and a second clamping plate (52); a diaphragm fixing shaft (521) is provided on one side of the second clamping plate (52); a rectangular slide groove (522) is provided on the other side of the second clamping plate (52); the rocker arm (6) is transmission-connected inside the rectangular slide groove (522); a diaphragm fixing through hole (511) is provided on the surface of the first clamping plate (51); and the diaphragm fixing shaft (521) and the diaphragm fixing through hole (511) are capable of clamping the metering diaphragm (4) when in cooperation.

5. The gas meter structure with higher measurement accuracy according to claim 4 is characterized in that: A cylindrical boss (61) is provided at one end of the rocker arm (6), and the cylindrical boss (61) can be slidably connected to the inside of a rectangular slide groove (522), and the length of the rectangular slide groove (522) is greater than the sliding length of the cylindrical boss (61). A second through hole (62) is provided at the other end of the rocker arm (6), and the cross-sectional shape of the second through hole (62) is adapted to the cross-sectional shape of the end of the vertical shaft (7), and the vertical shaft (7) is fixedly connected to the inside of the second through hole (62).

6. The gas meter structure with higher measurement accuracy according to claim 1 is characterized in that: A plurality of first cavities (14) are provided on the surface of the metering valve body (1); a valve body cover plate (8) is provided outside each of the first cavities (14); a second cavity (81) is provided inside each of the valve body cover plates (8); the first cavities (14) and the second cavities (81) constitute the metering chamber (3).

7. The gas meter structure with higher measurement accuracy according to claim 1 is characterized in that: The vertical shaft (7) and the pulling arm (71) are both made of plastic.

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