A diaphragm gas meter movement structure

Abstract

This invention relates to the field of gas meter technology, and more particularly to the mechanism structure of a diaphragm gas meter. In the mechanism structure, a valve grille mounting frame is fixedly installed on the mounting surface, contacting the bottom of the valve grille. The valve grille mounting frame includes two recessed edges respectively close to two sealing surfaces. The two recessed edges are recessed, and their height is lower than the sealing surfaces. The advantages of this design are: 1. It exposes the space inside the two sealing surfaces, allowing for better connection with the metering housing and increasing the sealing performance between them; 2. The mechanism body structure is injection molded from plastic material, ensuring uniform wall thickness along the entire circumference where the sealing surface connects to the metering housing, preventing localized thicker areas due to the valve grille mounting frame intersecting with the sealing surface, avoiding injection molding defects such as shrinkage marks on the sealing surface, and improving sealing reliability.

Description

Technical Field

[0001] This invention relates to the field of gas meter technology, and in particular to a diaphragm gas meter movement structure. Background Technology

[0002] A diaphragm gas meter is a type of volumetric gas metering instrument. It consists of a metering system with two fixed-volume containers. Each container is further divided into two metering chambers by a diaphragm, resulting in a total of four metering chambers. The pressure difference between the gas meter's inlet and outlet drives the diaphragm to move. Under the influence of this pressure difference, the diaphragm continuously alternates its movement, pushing two valve covers to continuously discharge the gas filling the metering chambers to the gas outlet. Simultaneously, a mechanical transmission mechanism connects to a counter, enabling the metering of the gas volume passing through the diaphragm gas meter. The diaphragm gas meter's mechanism includes a core, whose components are directly or indirectly mounted on... The movement body includes a central support column, a control lever support column, a rocker arm mounting column, and a mounting surface for connecting the valve grille. The central support column serves as a design and installation benchmark, and its positional accuracy and stability, along with those of the other support columns and valve grille, directly affect the metering accuracy and long-term stability of the gas meter. The movement body and valve grille are sealed and connected by applying adhesive, which also separates the various airflow channels. The movement body and metering housing have sealing surfaces, with sealing strips applied to the sealing surface of the metering housing. The movement body is mechanically riveted to connect and seal the diaphragm and metering housing.

[0003] Patent No. CN112444299A discloses a novel diaphragm gas meter movement structure. It can be seen that in the existing diaphragm gas meter movement structure, the mounting part on the movement body that contacts the valve grille is flush with and fixedly connected to the sealing surfaces on both sides. The two interfere with each other, which hinders the connection between the metering shell and the sealing surface. Furthermore, the wall thickness of the sealing surface and the metering shell is inconsistent around the entire circle, which will result in a thicker local thickness. The sealing surface is prone to injection molding defects such as injection molding shrinkage marks.

[0004] Based on this, the applicant is considering designing a diaphragm gas meter movement structure that facilitates a reliable connection between the meter housing and the sealing surface and better ensures the sealing effect. Summary of the Invention

[0005] In view of the shortcomings of the prior art, the technical problem to be solved by the present invention is: how to provide a diaphragm gas meter movement structure that can facilitate a reliable connection between the metering shell and the sealing surface and better ensure the sealing effect.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0007] The diaphragm gas meter mechanism includes a mechanism body, which includes an annular mounting surface. The mounting surface has sealing surfaces on both sides, and each of the two sealing surfaces has a concave metering cavity. A gas outlet is provided on the mounting surface. A valve grille mounting frame is fixedly provided on the mounting surface and contacts the bottom of the valve grille. The valve grille mounting frame includes two recessed edges that are close to the two sealing surfaces, and the height of the two recessed edges is lower than the upper edge of the sealing surfaces.

[0008] The working principle and advantages of the diaphragm gas meter movement structure in this technical solution are as follows:

[0009] The mounting portion on the mechanism body that contacts the valve grille is the valve grille mounting frame. The valve grille mounting frame and the two sides closest to the two sealing surfaces are both recessed edges, ensuring that the sealing surfaces and the valve grille mounting frame do not interfere with each other. The advantages of this design are:

[0010] First, the space inside the two sealing surfaces is exposed, allowing for better connection with the metering housing and increasing the sealing between the two.

[0011] Second, the core structure is made of plastic injection molding, which ensures that the wall thickness of the sealing surface and the metering shell is uniform throughout the entire circle. This prevents the valve grid mounting frame from intersecting with the sealing surface, resulting in localized thicker areas. It also avoids injection molding defects such as injection shrinkage marks on the sealing surface, thus improving sealing reliability.

[0012] Furthermore, the valve grille mounting frame also includes a recessed inner frame located between the two recessed sides. The recessed inner frame is recessed and its height is lower than the sealing surface. The recessed inner frame has two hollowed-out portions that are respectively connected to the two metering chambers.

[0013] Furthermore, the valve grille mounting frame also includes an air outlet connecting edge, which includes a middle edge fixedly connected above the air outlet, and two ends of the middle edge connected to side edges located on both sides of the air outlet; the top of the side edge is a slope, with the higher end of the slope connected to the middle edge and the lower end connected to the recessed edge.

[0014] Furthermore, it also includes a valve grille, which includes a first grille and a third grille installed between two sealing surfaces. The first grille also includes a second grille on both sides. The bottom of the first grille is in contact with the recessed edge and the recessed inner frame, and the bottom of the third grille is in contact with the air outlet connection edge.

[0015] Furthermore, the second gate includes an outer wall facing the third gate, the outer wall being planar.

[0016] Furthermore, a central support column is fixedly connected to the mounting surface between the two sides, and a reinforcing rib is fixedly connected to the outer wall of the central support column.

[0017] Furthermore, the reinforcing rib includes two first reinforcing ribs and one second reinforcing rib. One end of each of the two first reinforcing ribs is fixedly connected to the outer wall of the central axis support column, and the other end is fixedly connected to the sunken inner frame. One end of the second reinforcing rib is fixedly connected to the outer wall of the central axis support column, and the other end extends into the port of the air outlet facing the central axis support column and is fixedly connected to it.

[0018] Furthermore, the two first reinforcing ribs are arranged in a figure-eight shape in the top view, and the positions where the first reinforcing ribs are fixedly connected to the sunken inner frame are located at the two top corners of the sunken inner frame.

[0019] Furthermore, the port of the air outlet facing the central support column is higher than the sealing surface.

[0020] Furthermore, the air outlet includes a lateral air outlet port, and a clip fixedly connected to the mounting surface is provided below the lateral air outlet port, with the clip spaced apart from the sealing surface.

[0021] The working principle and advantages of the diaphragm gas meter movement structure involved in this technical solution are as follows:

[0022] In this solution, the sealing surface of the diaphragm gas meter does not interfere with the valve grille mounting frame during assembly or use. This not only improves the yield rate and assembly quality during product assembly, but also enhances the metering accuracy and extends the reliable service life of the gas meter, thus helping to improve the overall quality of the gas meter product. Attached Figure Description

[0023] Figure 1 This is a three-dimensional structural diagram of the connection between the mechanism body and the valve grille in an embodiment of the present invention;

[0024] Figure 2 This is a schematic diagram of the three-dimensional structure of the movement body according to an embodiment of the present invention;

[0025] Figure 3 This is a top view of the movement structure according to an embodiment of the present invention;

[0026] Figure 4 for Figure 3 Enlarged view of point A in the middle;

[0027] Figure 5 This is a bottom view of the valve grille mounting frame according to an embodiment of the present invention;

[0028] Figure 6 This is a three-dimensional structural diagram (top view) of the valve grille according to an embodiment of the present invention;

[0029] Figure 7 This is a three-dimensional structural schematic diagram (view from below) of the valve grille according to an embodiment of the present invention;

[0030] Figure 8 This is a three-dimensional structural diagram of the connection between the mechanism body, valve grille, and metering shell in an embodiment of the present invention;

[0031] Figure 9 This is a three-dimensional structural diagram of the connection between the movement body and the metering shell in an embodiment of the present invention;

[0032] Figure 10 This is a schematic diagram of pressure loss simulation analysis in an embodiment of the present invention;

[0033] In the above figures: 10, mechanism body; 100, mounting surface; 111, recessed edge; 112, recessed inner frame; 113, middle edge; 114, side edge; 120, air outlet; 121, lateral air outlet port; 122, clip; 13, central shaft; 130, central shaft support column; 131, first reinforcing rib block; 132, second reinforcing rib block; 200, sealing surface; 210, metering chamber; 30, valve grille; 310, first grille body; 320, second grille body; 321, outer wall of grille body; 330, third grille body; 400, metering shell; 410, connecting claw. Detailed Implementation

[0034] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0035] Refer to together Figures 1-9 This embodiment provides a diaphragm gas meter movement structure, including a movement body 10. The movement body 10 includes an annular mounting surface 100. The mounting surface 100 has sealing surfaces 200 on both sides. Each of the two sealing surfaces 200 has a concave metering cavity 210. The mounting surface 100 is provided with a gas outlet 120. A valve grille mounting frame that contacts the bottom of the valve grille 30 is fixedly provided on the mounting surface 100. The valve grille mounting frame includes two recessed edges 111 that are close to the two sealing surfaces 200 respectively. The two recessed edges 111 are recessed and their height is lower than the upper edge of the sealing surface 200.

[0036] In this embodiment, the mounting portion of the mechanism body 10 that contacts the valve grille 30 is a valve grille mounting frame. The valve grille mounting frame and the two sealing surfaces 200 are recessed edges 111 on both sides, so that the sealing surfaces 200 and the valve grille mounting frame do not interfere with each other. The advantages of this design include: First, it exposes the space inside the two sealing surfaces 200, allowing them to connect better with the metering shell 400 and increasing the sealing performance between them; Second, the mechanism body 10 is made of plastic injection molding, ensuring that the wall thickness of the sealing surface 200 and the metering shell 400 is uniform throughout the entire connection area, preventing the valve grille mounting frame from intersecting with the sealing surface 200 and causing local thickness to be too large, avoiding injection molding defects such as injection shrinkage marks on the sealing surface 200, and improving sealing reliability.

[0037] Preferably, such as Figure 2 , Figure 3 as well as Figure 5 As shown, the valve grille mounting frame also includes a recessed inner frame 112 located between the two recessed edges 111. The recessed inner frame 112 is recessed, and its height is lower than the sealing surface 200. The recessed inner frame 112 is provided with two hollowed-out parts that are respectively connected to the two metering chambers 210. The recessed inner frame 112 between the two recessed edges 111 in the valve grille mounting frame is recessed together, which can increase the integrity of the valve grille mounting frame. Specifically, the recessed inner frame 112 and the recessed edges 111 can be set to have the same height, and the recessed inner frame 112 and the recessed edges 111 are connected together, and the part connecting the two has the same height.

[0038] Preferably, such as Figure 2 , Figure 3 as well as Figure 5 As shown, the valve grille mounting frame also includes an air outlet connection edge, which includes a middle edge 113 fixedly connected above the air outlet 120. The middle edge 113 is connected to two side edges 114 located on both sides of the air outlet 120. The top of the side edge 114 is a slope, and the higher end of the slope of the side edge 114 is connected to the middle edge 113, and the lower end is connected to the recessed edge 111.

[0039] The function of the air outlet connection edge on the valve grille mounting frame is to surround the air outlet 120 part, so as to facilitate the subsequent connection between the valve grille 30 and the air outlet 120. Because of the height of the air outlet 120, the height of its middle edge 113 is higher than the lower edge 111, and the side edge 114 is connected by its inclined surface to transition between the height difference between the middle edge 113 and the lower edge 111.

[0040] Preferably, such as Figure 1 , Figure 6 , Figure 7 and Figure 8As shown, the diaphragm gas meter mechanism also includes a valve grille 30. The valve grille 30 includes a first grille 310 and a third grille 330 installed between two sealing surfaces 200. The first grille 310 also includes a second grille 320 on both sides. The bottom of the first grille 310 is in contact with the recessed edge 111 and the recessed inner frame 112. The bottom of the third grille 330 is in contact with the gas outlet connection edge.

[0041] The recessed inner frame 112 of the valve grille mounting frame is at the same height as the recessed edge 111. To ensure close contact with the recessed edge 111 and the recessed inner frame 112, the bottom of the first grille 310 in this design protrudes downwards compared to the valve grille 30 in the prior art. This makes the front sections of the first grille 310 and the third grille 330, which are in contact with the valve grille mounting frame, at the same height. This makes it easier to grind the lower end surfaces of the front sections of the first grille 310 and the third grille 330, thereby improving the flatness and smoothness of the lower end surface of the valve grille 30 and achieving better sealing and metering effects. Furthermore, the downwardly protruding first grille 310 increases the overall strength of the valve grille 30, making it less prone to deformation. Specifically, the bottom of the first grille 310 is level with the outermost bottom of the two second grilles 320.

[0042] Specifically, the second gate 320 includes an outer wall 321 facing the third gate 330, and the outer wall 321 is planar. Compared with the valve gate in the prior art, the valve gate 30 of this solution improves the flow channel structure, reduces the turning angle, and can improve the airflow capacity and reduce pressure loss.

[0043] Preferably, such as Figure 2 and Figure 3 As shown, a central support column 130 is fixedly connected to the mounting surface 100 between the two sides 114. A reinforcing rib is fixedly connected to the outer wall of the central support column 130. The central support column 130 is used for the installation of the central shaft in the diaphragm gas meter. In the prior art, the central support column 130 does not have any reinforcing structure, which may cause it to shift during manufacturing or use. The shift of the central support column 130 will affect the reliability and accuracy of the metering transmission. The central support column 130 is reinforced by the reinforcing rib to increase its stability and durability, thereby ensuring the reliability and accuracy of the metering transmission.

[0044] Specifically, the reinforcing ribs include two first reinforcing ribs 131 and one second reinforcing rib 132. One end of each of the two first reinforcing ribs 131 is fixedly connected to the outer wall of the central axis support column 130, and the other end is fixedly connected to the recessed inner frame 112. One end of the second reinforcing rib 132 is fixedly connected to the outer wall of the central axis support column 130, and the other end is fixedly connected to the air outlet 120 and the middle edge 113. The bottoms of the first reinforcing ribs 131 and the second reinforcing rib 132 are fixedly connected to the mounting surface 100. The central axis support column 130 is fixedly connected to the mounting surface 100, the valve grille mounting frame, and the air outlet 120 through the first reinforcing ribs 131 and the second reinforcing rib 132, making it stable, firm, and not prone to displacement.

[0045] More specifically, the two first reinforcing ribs 131 are arranged in a figure-eight shape in the top view, and the first reinforcing ribs 131 are fixedly connected to the sunken inner frame 112 at the two top corners of the sunken inner frame 112; the second reinforcing rib 132 is fixed to the center of the air outlet 120; the arrangement of the first reinforcing ribs 131 and the second reinforcing ribs 132 can play a guiding role, optimize the flow field, and reduce pressure loss.

[0046] More specifically, in the prior art, the height of the port of the air outlet 120 facing the central support column 130 is the same as the height of the sealing surface 200. In this solution, the port of the air outlet 120 facing the central support column 130 is raised, so that the port of the air outlet 120 facing the central support column 130 is higher than the sealing surface 200, thereby increasing the flow area, improving the airflow capacity, and reducing pressure loss.

[0047] More specifically, in the prior art, the central shaft support column 130 and the sealing surface 200 are at the same height, such as... Figure 1 and Figure 2 As shown, this design elevates the central shaft support column 130, making it higher than the sealing surface 200. This allows the central shaft 13 mounted on the central shaft support column 130 to be shorter. Compared to the central shafts of the prior art, the central shaft 13 of this design has higher strength and is less prone to deformation. Furthermore, the gear portion on the central shaft 13 is longer than that of the prior art, further improving the strength of the central shaft 13 while enhancing its connection stability.

[0048] Preferably, such as Figures 1-4 As shown, the air outlet 120 includes a horizontal air outlet port 121. Below the horizontal air outlet port 121, a clip 122 is fixedly connected to the mounting surface 100. The clip 122 is spaced apart from the sealing surface 200. The spaced clip 122 and the sealing surface 200 do not affect each other, which can facilitate the connection between the sealing surface 200 and the metering shell 400 and avoid the clip 122 from deforming due to vibration, contraction and deformation during the connection between the sealing surface 200 and the metering shell 400 and the diaphragm.

[0049] Preferably, such as Figure 8 and Figure 9 As shown, the diaphragm gas meter mechanism also includes two metering shells 400 that seal the two metering chambers 210 respectively. The edges of the two metering shells 400 are provided with a number of spaced connecting claws 410. The connecting claws 410 are used to bend to contact the sealing surface 200 on the side facing the mounting surface 100. Since the sealing surface 200 does not interfere with the valve grille mounting frame and the clip 122, a number of continuous connecting claws 410 can be spaced on the edges of the metering shells 400 to increase the connection area between the metering shells 400 and the sealing surface 200, thereby improving the sealing performance between the two.

[0050] A diaphragm gas meter includes the aforementioned diaphragm gas meter movement structure.

[0051] In this embodiment, during the assembly or use of the diaphragm gas meter, the sealing surface 200 and the valve grille mounting frame do not interfere with each other. The central axis support column 130 is raised and forms a support reinforcement to ensure that the central axis 13 does not deform or tilt. The improved airflow channel ensures better airflow capacity. This technical solution can not only improve the yield rate during product assembly, but also improve the metering accuracy and service life during product use, thereby improving the overall quality of the product.

[0052] Specifically, such as Figure 10 As shown, Figure 10 Pressure loss analysis was performed on three structures, a, b, and c, respectively (F1: gas flows out through the valve grille outlet; F2: gas flows to the diaphragm gas meter outlet). The analysis results are as follows:

[0053] Table 1 Comparison of Structure and Effect

[0054]

[0055]

[0056] In summary, this solution optimizes the flow field structure of the diaphragm gas meter by optimizing the structure of the valve grille 30, the valve grille mounting frame and reinforcing ribs, and raising the outlet 120. This reduces pressure loss during operation, makes the airflow more stable, and improves the metering stability and repeatability of the diaphragm gas meter.

[0057] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A diaphragm gas meter movement structure, comprising a movement body, the movement body including an annular mounting surface, the mounting surface having sealing surfaces on both sides, each of the sealing surfaces having a concave metering cavity formed therein, and a gas outlet provided on the mounting surface, characterized in that, A valve grille mounting frame is fixedly provided on the mounting surface, which contacts the bottom of the valve grille. The valve grille mounting frame includes two recessed edges that are close to the two sealing surfaces respectively, and the height of the two recessed edges is lower than the upper edge of the sealing surface. The valve grid mounting frame also includes a recessed inner frame located between the two recessed sides. The recessed inner frame is recessed and its height is lower than the sealing surface. The recessed inner frame has two hollowed-out portions that are respectively connected to the two metering chambers. The valve grid mounting frame also includes an air outlet connecting edge, which includes a middle edge fixedly connected above the air outlet, and two ends of the middle edge connected to side edges located on both sides of the air outlet; the top of the side edge is a slope, with the higher end of the slope connected to the middle edge and the lower end connected to the recessed edge.

2. The diaphragm gas meter movement structure as described in claim 1, characterized in that, It also includes a valve grille, which includes a first grille and a third grille installed between two sealing surfaces. The first grille also includes a second grille on both sides. The bottom of the first grille is in contact with the recessed edge and the recessed inner frame, and the bottom of the third grille is in contact with the air outlet connection edge.

3. The diaphragm gas meter movement structure as described in claim 2, characterized in that, The second gate includes an outer wall facing the third gate, and the outer wall is planar.

4. The diaphragm gas meter movement structure as described in claim 1, characterized in that, A central support column is fixedly connected to the mounting surface between the two sides, and a reinforcing rib is fixedly connected to the outer wall of the central support column.

5. The diaphragm gas meter movement structure as described in claim 4, characterized in that, The reinforcing rib includes two first reinforcing ribs and one second reinforcing rib. One end of each of the two first reinforcing ribs is fixedly connected to the outer wall of the central axis support column, and the other end is fixedly connected to the sunken inner frame. One end of the second reinforcing rib is fixedly connected to the outer wall of the central axis support column, and the other end extends into the port of the air outlet facing the central axis support column and is fixedly connected to it.

6. The diaphragm gas meter movement structure as described in claim 5, characterized in that, The two first reinforcing ribs are arranged in a figure-eight shape in the top view, and the positions where the first reinforcing ribs are fixedly connected to the sunken inner frame are located at the two top corners of the sunken inner frame.

7. The diaphragm gas meter movement structure as described in claim 6, characterized in that, The port of the air outlet facing the central support column is higher than the sealing surface.

8. The diaphragm gas meter movement structure as described in claim 7, characterized in that, The air outlet includes a horizontal air outlet port, and a clip is fixedly connected to the mounting surface below the horizontal air outlet port. The clip is spaced apart from the sealing surface.

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