Gas meter and gas meter assembly process

Abstract

The present invention relates to a gas meter and an assembly process for the gas meter, and belongs to the technical field of gas meters. The gas meter includes a base and a counter, the base includes a bottom plate, and the counter includes a shelf. The gas meter is characterized in that the bottom plate is constructed with at least two first mounting portions and at least two positioning components, and in the positioning components, a first positioning portion is constructed at least at one end away from the bottom plate, and the shelf is constructed with at least two second mounting portions adapted to the first mounting portions and at least two second positioning portions adapted to the first positioning portions. The installation position of the counter is positioned by cooperation between the first positioning portion and the second positioning portion, and the counter is detachably mounted on the base by cooperation between the first mounting portion and the second mounting portion. The gas meter can not only ensure the installation accuracy and consistency of the counter, but also simplify the operation and improve the assembly efficiency, thereby further effectively improving the production efficiency and qualified rate of the gas meter.

Description

Technical Field

[0001] The present invention relates to the technical field of gas meters, and in particular to a gas meter and an assembly process of the gas meter. Background Art

[0002] Gas meter, also known as gas meter, usually consists of a housing, movement, transmission mechanism, counter, etc. Among them, the housing is the supporting component of the entire gas meter. The movement, transmission mechanism, counter and other components in the gas meter are directly or indirectly fixed to the housing. Due to the variety of gas meter models and types, the shape of the housing is also diverse. However, the common gas meter housing is usually equipped with a separate counter box, such as the attached Figure 1 and Figure 2 As shown, at this time, the shell of the gas meter includes a main shell and a counter box arranged on one side of the main shell. The counter box includes a base and a box cover. The base is usually detachably connected to the main shell, and the box cover is detachably installed on the base, and together with the base, they form an inner cavity. The counter is separately assembled in the inner cavity, and an observation window is correspondingly constructed on the box cover so that the user can view the reading on the counter through the observation window; the movement is installed in the main shell, and is connected to the counter in the inner cavity through a transmission mechanism to realize the metering function.

[0003] In existing gas meters, due to structural limitations and constraints, the counter needs to be installed at a certain height above the base, so that there is a certain gap between the lower end of the counter and the bottom plate of the base, so that multiple gear sets in the transmission mechanism can be arranged in the gap. That is, in existing gas meters, multiple gear sets are arranged between the bottom plate of the base and the counter. Each gear set is connected to other transmission components in the transmission mechanism and finally realizes transmission connection with the movement. At the same time, one of the gear sets is also connected to the character wheel set in the counter to transmit power to the counter. One of the gear sets is a flow tooth that can adjust the flow rate.

[0004] In actual production, every gas meter needs to be inspected after assembly to ensure it meets the national standard. Currently, the national standard for metering error is ±1.5. Due to various factors, gas meters assembled using existing technology cannot guarantee a metering error within the 1.5 range (i.e., consistency cannot be guaranteed). In practice, the pass rate is typically around 90%. When the metering error exceeds 1.5, the meter's metering accuracy needs to be adjusted using flow teeth to ensure that the metering error meets the national standard. Because the flow teeth are installed between the base plate and the counter and are completely obscured by the counter, the actual calibration process involves first disassembling the counter, adjusting the flow teeth, and then reinstalling the counter. Finally, the adjusted gas meter is tested to ensure it meets the standard. If it fails, the calibration process is repeated until the meter meets the standard.

[0005] In addition, since the wheel group in the counter is connected to the movement through a transmission mechanism, the installation accuracy of the counter is directly related to the meshing accuracy of the wheel group and the transmission mechanism, and thus directly related to the metering accuracy of the gas meter. Therefore, it is necessary to ensure the installation accuracy of the counter as much as possible during the actual production, manufacturing and assembly process. In existing gas meters, the counter is usually installed on the base by screws. The specific structure is that there are threaded holes on the bottom plate of the base, and mounting holes that are adapted to the holes are constructed on the shelf of the counter. The shelf is fixed to the base with screws that are adapted to the threaded holes. However, the applicant found that it is difficult to ensure the installation accuracy of the counter with this existing assembly structure, which is not conducive to improving the metering accuracy and qualified rate of the gas meter. The main reason is that, on the one hand, it is difficult to ensure that the central axis of the mounting hole is exactly consistent with the central axis of the screw after assembly is completed by simply using the threaded hole, the mounting hole and the screw to constrain the counter (because the inner diameter of the mounting hole is usually larger than the outer diameter of the screw and also larger than the inner diameter of the threaded hole, such as Figure 3 As shown, there is a large gap between the screw and the mounting hole, which allows the counter to shift relative to the screw). The actual assembly position of the counter is random, and the consistency of assembly cannot be guaranteed. There are usually large installation errors, especially left-right deviation, up-down deviation, etc. Figure 3 As shown. Secondly, in the process of tightening the screws, it is also difficult to ensure that the central axis of the screw is exactly consistent with the central axis of the threaded hole, and it is easy to screw it off, which will cause the position of the counter to shift and cause installation errors. It is precisely because of these two reasons that the consistency of existing gas meters is poor and the assembly accuracy is difficult to guarantee, and it is difficult to further improve the qualified rate. Moreover, due to the poor assembly consistency, it is easy to need to make corrections repeatedly, which is not conducive to improving production efficiency. In addition, the existing assembly structure also has the problems of cumbersome assembly process and low efficiency. Therefore, how to further improve the production efficiency of gas meters and further improve the qualified rate of products needs to be solved urgently. Summary of the Invention

[0006] The first aspect of the present invention is to solve the problem that the existing gas meter counter installation process is cumbersome and inefficient, and the assembly consistency is poor, which cannot ensure the counter installation accuracy, resulting in difficulty in improving the production efficiency and pass rate of the gas meter. A gas meter that can effectively improve the production efficiency and pass rate is provided. The main concept is:

[0007] A gas meter includes a base and a counter, wherein the base includes a bottom plate, the bottom plate is constructed with at least two first mounting portions and at least two positioning components, and the first positioning portion is constructed at least at one end of the positioning components facing away from the bottom plate; the counter includes a shelf, the shelf is constructed with at least two second mounting portions adapted to the first mounting portions and at least two second positioning portions adapted to the first positioning portions, the installation position of the counter is positioned by the cooperation of the first positioning portions and the second positioning portions, and the counter is detachably mounted on the base by the cooperation of the first mounting portion and the second mounting portion. In this solution, by configuring a positioning component on the bottom plate, the local thickness of the bottom plate can be increased so that the first positioning portion can be formed on the positioning component, thereby solving the problem of facilitating the formation of the first positioning portion on the bottom plate; by constructing the first positioning portion on the positioning component and configuring the second positioning portion on the counter, when assembling the counter, the first positioning portion and the second positioning portion can be used to guide the counter and guide the counter to move quickly to a predetermined position. At the same time, the counter can also be positioned so as to accurately locate the installation position of the counter; and by configuring at least two first positioning portions and a second positioning portion so as to form at least two constraints on the counter, the counter can be effectively prevented from rotating, achieving the purpose of accurately locating the installation orientation of the counter, so that the counter can be accurately installed at the predetermined position, avoiding problems such as left-right or up-down offset of the counter after installation. By configuring the first mounting portion and the second mounting portion, the counter can be firmly fixed to the base through their configuration, preventing the counter from moving relative to the base, and effectively completing the assembly of the counter. Compared with the existing technology, on the one hand, the gas meter can effectively ensure the installation accuracy of the counter, thereby ensuring the meshing accuracy of the wheel group and the transmission mechanism, and can also effectively ensure the consistency of the installation accuracy of each gas meter, and solve the problem of uncertainty in the actual installation position of the existing counter, thereby further improving the measurement accuracy of the gas meter and achieving the purpose of further improving the qualification rate of the gas meter; on the other hand, during the assembly process of the gas meter, the installation position of the counter can be quickly and accurately located, and there is no need to perform tedious positioning operations, thereby further simplifying the operation and improving the assembly efficiency; in addition, since the cooperation between the first positioning part and the second positioning part limits the assembly direction of the counter, the assembly direction of the counter becomes single, which is more conducive to automated assembly.

[0008] To precisely locate the counter's installation position, preferably, the first positioning portion is a positioning hole, and the second positioning portion is a positioning post that fits the positioning hole; or, alternatively, the first positioning portion is a positioning post, and the second positioning portion is a positioning hole that fits the positioning post. The cooperation between the positioning post and the positioning hole not only allows precise positioning of the counter's installation position, but also serves as a guide for assembly, allowing the counter to be quickly assembled to the desired position.

[0009] In order to further improve the assembly efficiency, a guide portion is constructed on the top of the first positioning portion so that the counter can be inserted into the first positioning portion by the guide portion, which is conducive to completing the positioning work more quickly and further improving the assembly efficiency.

[0010] In order to solve the problem of accurately positioning the installation height of the counter, preferably, the positioning component is also constructed with a first supporting surface for supporting the counter, and the first supporting surface is constructed at a position adapted to the first positioning portion, and the lower end of the shelf is constructed with a second supporting surface adapted to the first supporting surface, and the installation height of the counter is positioned by the cooperation of the first supporting surface and the second supporting surface. When the counter completes the orientation constraint through the cooperation of the first positioning portion and the second positioning portion, the second supporting surface just abuts against the first supporting surface. The first supporting surface can be used to support the counter, making the installation of the counter more stable, and can also limit the height of the counter, achieving the purpose of positioning the installation height of the counter; and through the cooperation of the supporting surface and the positioning portion, the dual positioning of the height and orientation of the counter can be effectively achieved, which is more convenient for fast and accurate assembly of the counter, and the assembly accuracy of the counter in each gas meter is consistent.

[0011] In some embodiments, the base plate is further provided with a plurality of supporting components for supporting the counter. The top of each supporting component is configured with a first supporting surface for supporting the counter, and the first supporting surface is configured to fit within a first positioning portion. The lower end of the shelf is configured with a second supporting surface that fits within the first supporting surface. The first and second supporting surfaces cooperate to determine the installation height of the counter. In this embodiment, the supporting components and the positioning components can be independent components so that they can be formed separately. Furthermore, the supporting surface and the positioning portion can form a positioning fit to better position and install the counter.

[0012] To facilitate assembly, the frame is preferably constructed with a cavity for mounting the character wheel assembly. The frame's lower end is constructed with an opening communicating with the cavity, and the corresponding upper end is constructed with a window adapted to accommodate the character wheel assembly. When the frame is mounted on the base, the opening corresponds to the bottom plate. That is, the opening is located precisely between the base's bottom plate and the frame, providing space for arranging the gear assembly in the transmission mechanism.

[0013] To facilitate positioning, the shelf is further provided with a lug on its side, the second positioning portion is constructed on the lug, and the second support surface is constructed at the lower end of the lug. Providing the lug on the side of the shelf allows the second positioning portion to be constructed outside the shelf, without the shelf interfering with the second positioning portion. This facilitates positioning the counter using the second positioning portion in conjunction with the first positioning portion. Furthermore, the second positioning portion does not interfere with the shelf and does not occupy the shelf cavity, making assembly of the character wheel assembly and the counter more convenient.

[0014] The second aspect of the present invention aims to further improve installation and disassembly efficiency. Furthermore, the first mounting portion utilizes a male buckle, and the second mounting portion utilizes a female buckle that fits the male buckle; or, the first mounting portion utilizes a female buckle, and the second mounting portion utilizes a male buckle that fits the female buckle. The male and female buckles can achieve a snap-on connection, allowing the rack to be quickly and efficiently snapped onto the base through their cooperation, achieving detachable installation of the counter. Compared to the method of fixing the counter with screws, this solution only requires a simple press after positioning to complete the counter installation. The entire installation process does not require any screws, tightening screws, or additional assembly tools, greatly simplifying the assembly process and significantly improving installation efficiency. When the counter needs to be disassembled for calibration, it can be disassembled by simply pressing and plugging it in and out. The entire disassembly process does not require loosening screws, and no additional disassembly tools are required. This greatly simplifies the disassembly process and is more suitable for situations where the counter needs to be disassembled for calibration, thereby significantly improving disassembly efficiency. In addition, due to the limitation of the positioning part, the engagement and unlocking directions of the male buckle and the female buckle are single, which is more conducive to the automated assembly of the counter.

[0015] To solve the problem of achieving a snap-on connection between a male and female buckle, the male buckle preferably includes an elastic arm and a protrusion disposed on the outer side of the elastic arm, the inner end of the protrusion being configured as a first mating surface, and the outer end of the protrusion being configured as a first guide surface; the female buckle includes a snap-on base, one side of which is configured with a recessed portion adapted to the protrusion and a second guide surface adapted to the first guide surface, and the sidewall of the recessed portion adjacent to the second guide surface being configured as a second mating surface; the mating of the first and second guide surfaces guides the protrusion into the corresponding recessed portion, and the mating of the first and second mating surfaces prevents the protrusion from being removed from the recessed portion. Through the mating of the male and female buckles, the counter shelf can be snap-on connected to the base, thereby achieving a quick and easy disassembly function.

[0016] To further improve the assembly accuracy of the counter, the first mounting portion is further configured with a first support surface for supporting the counter, and the first support surface is configured to align with the first positioning portion. This allows the first support surface at the first mounting portion to support and position the counter, thereby cooperating with first support surfaces at other locations to achieve multi-point support for the counter, making the counter more accurately, stably, and securely mounted.

[0017] To simplify the structure, the shelf further includes two sets of oppositely disposed side panels, one set of which is respectively provided with a second positioning portion, and the other set of side panels, one of which is provided with a second mounting portion, and the other side panel is provided with one or two second mounting portions. The positioning portions disposed on opposite sides of the shelf enable precise positioning of the counter, while the two or three mounting portions disposed on other opposite sides of the shelf also securely secure the counter. The coordinated cooperation of the positioning portions and mounting portions not only achieves precise positioning, secure fixation, and convenient disassembly, but also minimizes the structure, simplifies the molding process, and reduces costs.

[0018] The third aspect of the present invention aims to further improve disassembly efficiency. Furthermore, the male buckle includes a pressure handle disposed on the elastic arm. The pressure handle and the protrusion are disposed on the same side of the elastic arm, and a distance is provided between the pressure handle and the protrusion. By configuring the pressure handle, a user can press the pressure handle to elastically deform the elastic arm, thereby allowing the protrusion to exit the recess through the elastic deformation of the elastic arm, achieving faster and more labor-saving unlocking.

[0019] For ease of formation, the base is an integrally formed plastic part, and / or the frame is an integrally formed plastic part.

[0020] Furthermore, the counter further comprises a character wheel set, wherein the character wheel set comprises a plurality of transmission-connected character wheels, each character wheel is respectively mounted on a rotating shaft, and the rotating shaft is mounted on a frame.

[0021] Furthermore, the device further comprises a movement and a transmission mechanism. The housing comprises a main housing and a lid adapted to fit the base. The base's bottom plate is connected to the outside of the main housing, and the lid is mounted on the base. The base and lid together form an inner cavity. The movement is mounted within the main housing, and the counter is mounted within the inner cavity. The movement is connected to a gear train via a transmission mechanism. The transmission mechanism includes flow teeth disposed within the inner cavity, and the flow teeth are mounted between the bottom plate and the counter. In this embodiment, the base and lid together form a counter box for accommodating the counter, allowing the counter to be mounted separately.

[0022] An assembly process for improving the qualification rate of a gas meter, using the gas meter, comprises the following steps:

[0023] Step 1: Fix the housing of the gas meter and install the base on the housing;

[0024] Step 2: Install the gear set in the transmission mechanism on the bottom plate of the base, wherein the gear set includes flow gears;

[0025] Step 3: Move the counter to the top of the bottom plate so that each second positioning portion corresponds to each first positioning portion;

[0026] Step 4: Move the counter downward so that the second positioning portion forms a positioning fit with the first positioning portion, and the second supporting surface of the counter gradually approaches the first supporting surface of the base. At the same time, the second mounting portion gradually forms a fit with the first mounting portion.

[0027] Step 5: Continue to move the counter downward until the second support surface is in contact with the first support surface. At this point, the male buckles snap into the corresponding female buckles, and the flow teeth are located between the counter and the base plate. The counter is now assembled. This assembly method is not only simple and efficient, but also allows for more convenient automated assembly. It also effectively ensures the installation accuracy of the counter and ensures the consistency of the counter assembly in each gas meter, thereby further improving the production efficiency of gas meters and further increasing the pass rate of gas meters.

[0028] Compared with the existing technology, the gas meter and gas meter assembly process provided by the present invention can not only ensure the installation accuracy and consistency of the counter, but also simplify the operation and improve the assembly efficiency, thereby further effectively improving the production efficiency and pass rate of the gas meter. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0030] Figure 1 This is a front view of a gas meter provided in Example 1 of the present invention.

[0031] Figure 2 for Figure 1 Left view of .

[0032] Figure 3 This is a schematic diagram showing that after the counter is fixed to the base with screws, the actual assembly position of the counter deviates from the center of the threaded hole.

[0033] Figure 4 This is a schematic diagram of the three-dimensional partial structure of a base provided in Example 1 of the present invention.

[0034] Figure 5 for Figure 4 A partial enlarged schematic diagram.

[0035] Figure 6 A partial front view of a base provided in Example 1 of the present invention.

[0036] Figure 7 This is a schematic diagram of the three-dimensional structure of a rack provided in Example 1 of the present invention.

[0037] Figure 8 for Figure 7 Partial schematic diagram of the middle shelf.

[0038] Figure 9 This is a top view of the counter after it is assembled on the base.

[0039] Figure 10 A schematic diagram of the three-dimensional partial structure of a base provided in Example 2 of the present invention.

[0040] Figure 11 A side view of a male buckle.

[0041] Figure 12 for Figure 10 Cross-sectional view at AA in the middle.

[0042] Figure 13 This is a schematic diagram of the second mounting portion in the counter being fastened to a female buckle on the base.

[0043] Figure 14 A schematic diagram of another female buckle provided in Example 2 of the present invention.

[0044] Figure 15 This is a schematic diagram of another female buckle provided in Example 2 of the present invention.

[0045] Figure 16 This is one of the schematic diagrams of the three-dimensional structure of a shelf in a counter provided in Example 2 of the present invention.

[0046] Figure 17 This is a second schematic diagram of the three-dimensional structure of a shelf in a counter provided in Example 2 of the present invention.

[0047] Figure 18 for Figure 17 Cross-sectional view at the middle BB.

[0048] Figure 19 This is a top view of the counter after it is assembled on the base.

[0049] Figure 20 for Figure 19 Cross-sectional view at CC.

[0050] Figure 21 This is a schematic diagram of the partial three-dimensional structure after the counter is assembled on top of the base.

[0051] Figure 22 This is a schematic diagram of the partial structure of a male buckle provided in Example 2 of the present invention.

[0052] Figure 23 A partial cross-sectional view of a female buckle provided in Example 3 of the present invention.

[0053] Figure 24 This is a partial cross-sectional view after the counter is assembled on top of the base.

[0054] Explanation of the marks in the figure: main shell 1; base 2, bottom plate 21, side edge plate 22, first positioning portion 23, positioning component 231, positioning column 232, guide portion 233, rib 234, support component 235, first supporting surface 236, first mounting portion 24, threaded hole 241; counter 3, shelf 31, side plate 311, top plate 312, window 313, character wheel set 32, second positioning portion 33, support ear 331, positioning hole 332, second supporting surface 333, second mounting portion 34, mounting hole 341; male buckle 4, elastic arm 41, protrusion 42, first mating surface 421, first guide surface 422, pressing handle 43; female buckle 5, fastening base 51, recess 52, second mating surface 521, second guide surface 522, protrusion 53, fastening platform 54; box cover 6, observation window 61; gear (gear set) 7. DETAILED DESCRIPTION

[0055] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments. The components of the embodiments of the present invention generally described and shown in the drawings herein can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative work are within the scope of protection of the present invention.

[0056] Example 1

[0057] This embodiment provides a gas meter, including a base 2 and a counter 3, wherein the base 2 includes a bottom plate 21 and a side plate 22 connected to the bottom plate 21. Figure 1-Figure 4 As shown, the bottom plate 21 is mainly used for bearing; the counter 3 includes a rack 31 for mounting a character wheel set 32. In this example, the rack 31 can adopt the rack 31 structure commonly used in existing gas meters, and in order to better adapt to the shape of the character wheel set 32 in the counter 3, in this embodiment, the rack 31 is constructed with a cavity for mounting the character wheel set 32, the lower end of the rack 31 is constructed with an opening connected to the cavity, and the corresponding upper end is constructed with a window 313 adapted to the character wheel set 32, as shown in FIG. Figure 7 and Figure 8As shown, when the shelf 31 is mounted on the base 2, the opening is exactly aligned with the bottom plate 21 of the base 2, that is, the opening is exactly located between the bottom plate 21 of the base 2 and the shelf 31, so as to provide space for arranging the gear set 7 in the transmission mechanism. In this embodiment, the shelf 31 adopts a box-shaped structure surrounded by four side plates 311 and a top plate 312, as shown in FIG. Figure 7-10 As shown, the window 313 is constructed on the top plate 312 , and the four side plates 311 are formed at one end away from the top plate 312 to form the opening, and the four side plates 311 and the top plate 312 together enclose the cavity.

[0058] In this embodiment, at least two first mounting portions 24 for detachably mounting the counter 3 are constructed on the base plate 21. At the same time, the shelf 31 of the counter 3 is also constructed with at least two second mounting portions 34 adapted to the first mounting portions 24. The number of the first mounting portions 24 and the second mounting portions 34 are the same, and the positions are adapted, so that each first mounting portion 24 and each second mounting portion 34 can be paired with each other, so that the counter 3 can be detachably mounted on the base 2 through the cooperation of the first mounting portion 24 and the second mounting portion 34. In this embodiment, the first mounting portion 24 and the second mounting portion 34 each have multiple implementations. For example, the first mounting portion 24 can be a mounting hole 341. In this case, the second mounting portion 34 can be a through hole, so that the counter 3 can be detachably mounted on the base plate 21 by fasteners such as a bolt pair. For another example, the first mounting portion 24 can also be a threaded hole 241, such as Figure 4 and Figure 9 As shown, in this case, the second mounting portion 34 can be a through hole adapted to the threaded hole 241, so that the counter 3 can be detachably mounted on the base plate 21 using fasteners such as screws. Since the position of the counter 3 in the gas meter used in this embodiment has been accurately positioned by the positioning portion, no matter what structure the first mounting portion 24 and the second mounting portion 34 adopt, the positioning accuracy and installation accuracy of the counter 3 will not be affected.

[0059] In this embodiment, the base 2 is constructed with a first positioning portion 23 that is adapted to the counter 3 and is used to locate the installation position of the counter 3; at the same time, the shelf 31 of the counter 3 is also constructed with a second positioning portion 33 that is adapted to the first positioning portion 23, so that during the assembly process of the counter 3, the installation position of the counter 3 can be accurately located through the cooperation between the first positioning portion 23 and the second positioning portion 33.

[0060] During implementation, the first positioning portion 23 can be directly constructed on the bottom plate 21. In this case, the first positioning portion 23 can be formed using a positioning column 232, a positioning hole 332, or a positioning groove, etc. However, since, on the one hand, the bottom plate 21 of the base 2 is usually relatively thin, it is not convenient to directly form the first positioning portion 23 on the bottom plate 21. On the other hand, space needs to be reserved between the counter 3 and the bottom plate 21 for installing the gear set 7 in the transmission mechanism. The counter 3 is not directly mounted on the bottom plate 21. Therefore, in a preferred embodiment, the bottom plate 21 of the base 2 is also constructed with a positioning component 231. The positioning component 231 protrudes from the bottom plate 21, so that the positioning component 231 can increase the local thickness of the bottom plate 21, thereby conveniently forming the first positioning portion 23 directly on the positioning component 231. At the same time, in the positioning component 231, at least at one end facing away from the base plate 21, there is constructed a first positioning portion 23 adapted to fit the counter 3 and used to locate the installation position of the counter 3. That is, the first positioning portion 23 can be directly constructed on the positioning component 231, and the first positioning portion 23 is at least set at the top of the positioning component 231 so as to cooperate with the counter 3 above. In this embodiment, the first positioning portion 23 is mainly used to facilitate the molding of the first positioning portion 23 and support the first positioning portion 23. At the same time, it also enables the first positioning portion 23 to be located at a certain distance above the base plate 21. Therefore, this embodiment does not limit the shape of the positioning component 231. As a preference, the positioning component 231 can preferably adopt a cylindrical structure or a square column structure for easy molding. In this embodiment, the first positioning portion 23 can also adopt a positioning hole 332, a positioning groove or a positioning column 232, etc., with the second positioning portion 33 adapted thereto.

[0061] Specifically, for example, the first positioning portion 23 may be a positioning hole 332 configured at the top of the positioning component 231. In this case, the second positioning portion 33 is a positioning post 232 adapted to the positioning hole 332. The shape of the positioning hole 332 is adapted to the shape of the positioning post 232. Through the cooperation between the positioning hole 332 and the positioning post 232, precise positioning of the counter 3 is achieved. Similarly, for another example, the first positioning portion 23 may be a positioning post 232 configured at the top of the positioning component 231, and the second positioning portion 33 may be a positioning hole 332 adapted to the positioning post 232. This can also achieve precise positioning. During implementation, the positioning hole 332 can preferably be a circular hole. In this case, the positioning column 232 adopts a cylindrical rod or a cylindrical tube with a shape that matches it. In order to improve the positioning accuracy while taking into account assembly, it is necessary to strictly control the inner diameter of the positioning hole 332 and the outer diameter of the positioning column 232 so that the two can achieve a more precise fit. For example, in this embodiment, after experimental verification, the inner diameter of the positioning hole 332 is controlled to be within 1.2mm larger than the outer diameter of the positioning column 232. This can effectively improve the positioning accuracy, and can improve the measurement accuracy and product qualification rate. In the preferred solution, the difference between the inner diameter of the positioning hole 332 and the outer diameter of the positioning column 232 can be controlled to 0.5-1.0mm, especially when 0.7mm or 0.8mm is used, which is conducive to further improving the measurement accuracy and product qualification rate. In addition, the positioning hole 332 can also adopt a regular polygonal hole, such as a square hole. In this case, the positioning column 232 adopts a square rod or a square tube with a shape that matches it. In this embodiment, as Figure 4 and Figure 5 As shown, the positioning member 231 is a cylindrical structure, and the first positioning portion 23 is a cylindrical rod. The outer diameter of the positioning member 231 can be the same as that of the first positioning portion 23 to simplify the molding process. Of course, the outer diameter of the positioning member 231 can also be larger than the outer diameter of the first positioning portion 23. Of course, the first positioning portion 23 and the second positioning portion 33 can also have other embodiments. For example, the first positioning portion 23 can also be a positioning groove, and the second positioning portion 33 can be a positioning head that adapts to the positioning groove. The cooperation between the two can also achieve the purpose of positioning.

[0062] During implementation, the number of positioning components 231 can be determined according to actual needs. Only one positioning component 231 can be constructed on the bottom plate 21 of the base 2. In a preferred embodiment, the bottom plate 21 of the base 2 is constructed with at least two positioning components 231, so that the base 2 is configured with at least two first positioning portions 23, and correspondingly, the shelf 31 is provided with at least two second positioning portions 33; by configuring at least two first positioning portions 23 and second positioning portions 33, so as to form at least two constraints on the counter 3, the counter 3 can be effectively prevented from rotating, so as to achieve the purpose of accurately positioning the installation orientation of the counter 3, so that the counter 3 can be accurately installed at the predetermined position, avoiding problems such as left-right or up-down offset of the counter 3 after installation.

[0063] Compared with the existing gas meters, on the one hand, the present gas meter can effectively ensure the installation accuracy of the counter 3, thereby ensuring the meshing accuracy of the wheel group 32 and the transmission mechanism, and can also effectively ensure the consistency of the installation accuracy of each gas meter. Moreover, it has been verified through experiments that the assembly of the counter 3 in the present gas meter can achieve 100% qualification, and can solve the problem of uncertainty in the actual installation position of the existing counter 3, thereby further improving the metering accuracy of the gas meter and achieving the purpose of further improving the qualification rate of the gas meter. Preliminary experiments have proved that the qualification rate of gas meters with this structure can usually reach about 95-96%, which is a great improvement compared with the existing technology; on the other hand, during the assembly process of the present gas meter, the installation position of the counter 3 can be quickly and accurately positioned, and there is no need to perform tedious positioning operations, thereby further simplifying the operation and improving the assembly efficiency; in addition, since the cooperation between the first positioning portion 23 and the second positioning portion 33 limits the assembly direction of the counter 3, the assembly direction of the counter 3 becomes single, which is more conducive to automated assembly.

[0064] In a more perfect solution, the top of the first positioning portion 23 is further configured with a guide portion 233, such as Figure 5 As shown, the guide portion 233 is used to guide the second positioning portion 33 in the counter 3 to be inserted into the first positioning portion 23, which is conducive to completing the positioning work more quickly, thereby improving assembly efficiency. In practice, when the first positioning portion 23 adopts a positioning hole 332, the opening of the positioning hole 332 is chamfered, and the chamfer forms the guide portion 233 to guide the positioning column 232 to be quickly inserted; when the first positioning portion 23 adopts a positioning groove, the opening of the positioning groove is chamfered, and the chamfer forms the guide portion 233; when the first positioning portion 23 adopts a positioning column 232, the top of the positioning column 232 gradually decreases in cross-sectional area along the direction away from the bottom plate 21 to form the guide portion 233. For example, the guide portion 233 is a conical structure, a truncated cone structure (such as Figure 4-Figure 6 As shown) or a spherical structure, the side wall of the guide portion 233 can play a guiding role to guide the positioning column 232 to quickly insert into the corresponding positioning hole 332.

[0065] In order to quickly position the counter 3 at a set height from the base plate 21, in one embodiment, the positioning component 231 is also constructed with a first supporting surface 236 for supporting the counter 3, and the first supporting surface 236 is constructed at a position adapted to the first positioning portion 23; at the same time, the lower end of the shelf 31 is constructed with a second supporting surface 333 adapted to the first supporting surface 236, so that the installation height of the counter 3 can be positioned by the cooperation between the first supporting surface 236 and the second supporting surface 333. Specifically, after the counter 3 completes the constraint of the orientation of the counter 3 through the positioning part (i.e., including the first positioning part 23 and the second positioning part 33, which will not be described in detail later), the second support surface 333 just abuts against the first support surface 236. The first support surface 236 can not only support the counter 3, making the installation of the counter 3 more stable, but also limit the height of the counter 3, thereby achieving the purpose of positioning the installation height of the counter 3. Through the cooperation of the support surface (i.e., including the first support surface 236 and the second support surface 333, which will not be described in detail later) and the positioning part, the dual positioning of the height and orientation of the counter 3 can be effectively achieved, which is more convenient for the rapid and accurate assembly of the counter 3, and the assembly accuracy of the counter 3 in each gas meter is consistent. There are multiple implementation methods for forming the first support surface 236. For example, a number of ribs 234 can be provided on the side of the positioning component 231, such as Figure 4-Figure 6 As shown, the upper surface of the rib 234 forms at least a portion of the first supporting surface 236. Figure 5 As shown, three ribs 234 of equal height are provided in the circumferential direction of the positioning component 231. The lower ends of the ribs 234 are connected to the base plate 21, and the upper ends of the ribs 234 form the first supporting surface 236. The configuration of the ribs 234 can not only strengthen the positioning component 231 and improve the stability of the positioning component 231, but also serve as a bearing component and a height positioning component 231 for supporting the counter 3, which is conducive to a more compact structure of the entire positioning component 231. For another example, the positioning component 231 can also adopt a stepped structure, so that the steps in the stepped structure form the first supporting surface 236. For example, the positioning component 231 can adopt a stepped shaft comprising two shaft segments, wherein the shaft end with a larger diameter is connected to the base plate 21, and the shaft segment with a smaller diameter serves as the positioning column 232. The step between the two shaft segments forms the first supporting surface 236, which is not only convenient for molding, but also meets the requirements of positioning and supporting the counter 3.

[0066] In another embodiment, the bottom plate 21 is further provided with a plurality of supporting members 235 for supporting the counter 3, such as Figure 6As shown, the top of the support member 235 is constructed with a first support surface 236, which is positioned to align with the first positioning portion 23. Accordingly, the lower end of the shelf 31 (e.g., the side panel 22 of the shelf 31) is constructed with a second support surface 333 that aligns with the first support surface 236. The cooperation between the first and second support surfaces 236 and 333 determines the installation height of the counter 3. In other words, the support member 235 and the positioning member 231 can be separate components, allowing for separate molding. Furthermore, the support surface and the positioning portion can form a mateable fit to better position and install the counter 3. The shape of the support member 235 can be determined based on actual needs, with plate-like and columnar structures being preferred.

[0067] In practice, the second positioning portion 33 can be constructed at any position of the shelf 31. However, in order to facilitate the positioning operation, in a preferred embodiment, a support ear 331 is provided on the side of the shelf 31, and the second positioning portion 33 can be constructed on the support ear 331. For example, the support ear 331 can be connected to the outer surface of the side plate 311 of the shelf 31, as shown in FIG. Figure 7 and Figure 8 As shown, the second positioning portion 33 constructed on the ear 331 can be located outside the rack 31 and at a certain distance from the rack 31. For example, Figure 7 As shown, ears 331 are respectively provided on the outer sides of the two corresponding side panels 311 in the rack 31. The ears 331 are respectively constructed with positioning holes 332 serving as the second positioning parts 33. The positioning holes 332 are away from the side panels 311 of the rack 31. The rack 31 will not interfere with the second positioning parts 33, making it easier to use the cooperation between the second positioning parts 33 and the first positioning parts 23 to locate the position of the counter 3. At the same time, the second positioning parts 33 will not interfere with the rack 31 and will not occupy the cavity of the rack 31, thereby making it easier to assemble the character wheel set 32 and the counter 3.

[0068] In this embodiment, the lower end of the ear 331 is further configured with a second support surface 333, so that during the assembly process, the second support surface 333 and the first support surface 236 can be more conveniently used to form a height positioning for the counter 3. In practice, the ear 331 can be set at any position in the height direction of the shelf 31 to achieve the purpose of positioning. However, in a preferred embodiment, the ear 331 can be preferably set on the side of the lower end of the shelf 31, such as Figure 7 and Figure 8 As shown, the lower end of the ear 331 can protrude from the lower end surface of the shelf 31, so that the second support surface 333 can be located below the lower end surface of the shelf 31, which is not only closer to the base 2, but also more convenient for cooperation with the first support surface 236, and is also beneficial for reducing the contact area on the basis of achieving limitation and positioning, so as to further improve the positioning accuracy.

[0069] For ease of formation, in practice, the entire base 2 can be an integrally formed plastic part, and at the same time, the entire frame 31 can also be an integrally formed plastic part.

[0070] Example 2

[0071] Using the first mounting portion 24 in a conventional gas meter not only requires multiple additional screws to secure the counter 3, but also results in large errors and poor accuracy. In particular, all screws must be removed to disassemble the counter 3, which can be cumbersome and inconvenient for gas meter calibration. To address this technical issue, the main difference between this embodiment 2 and the aforementioned embodiment 1 is that the first mounting portion 24 and the second mounting portion 34 can be connected by a snap-fit connection, thereby securing the counter 3. This makes installation and removal of the counter 3 much easier, significantly improving installation efficiency and removal effectiveness.

[0072] Specifically, during implementation, the first mounting portion 24 can be a male buckle 4, while the second mounting portion 34 is a female buckle 5 that fits the male buckle 4. This allows the counter 3 to be secured to the base 2 during assembly through the engagement of the male and female buckles 4, achieving a removable connection. Similarly, during implementation, the first mounting portion 24 can also be a female buckle 5, while the second mounting portion 34 is a male buckle 4 that fits the female buckle 5, achieving the same effect. Compared to using screws to secure the counter 3, this solution allows the counter 3 to be installed with a simple press after positioning. The entire installation process does not require any screws, tightening screws, or additional assembly tools, significantly simplifying the assembly process and significantly improving installation efficiency. When the counter 3 needs to be disassembled for calibration, it can be disassembled with a simple press and pull-out action. The entire disassembly process does not require loosening screws or additional disassembly tools, significantly simplifying the disassembly process and making it more suitable for applications where the counter 3 needs to be disassembled for calibration, thereby significantly improving disassembly efficiency. In addition, due to the limitation of the positioning portion, the engagement and unlocking directions of the male buckle 4 and the female buckle 5 are single, which is more conducive to the automatic assembly of the counter 3.

[0073] In a more specific embodiment, the male buckle 4 includes an elastic arm 41 and a convex portion 42 disposed on the outer side of the elastic arm 41. Figure 10 and Figure 11 As shown, the inner end of the protrusion 42 is configured as a first mating surface 421, and the outer end of the protrusion 42 is configured with a first guide surface 422. Accordingly, the female buckle 5 includes a fastening base 51, as shown in FIG. Figure 10 and Figure 12As shown, one side of the snap-fit base 51 is configured with a recess 52 adapted to the protrusion 42 and a second guide surface 522 adapted to the first guide surface 422, and the side wall of the recess 52 close to the second guide surface 522 is configured as a second mating surface 521; so that during assembly, the protrusion 42 can be guided into the corresponding recess 52 through the mating of the first guide surface 422 and the second guide surface 522, while the mating of the first mating surface 421 and the second mating surface 521 can prevent the protrusion 42 from coming out of the recess 52. Figure 13 As shown, through the cooperation between the male buckle 4 and the female buckle 5, the frame 31 of the counter 3 can be securely snap-connected with the base 2 to achieve a quick installation and removal function.

[0074] In implementation, the elastic arm 41 may be a plate-shaped structure, and the first guide surface 422 and the second guide surface 522 may be arc-shaped surfaces or inclined surfaces inclined in the vertical direction, such as Figure 10-13 shown.

[0075] In practice, the recess 52 may be a groove formed on the side of the fastening base 51, such as Figure 14 As shown, it can also be a hole constructed on the side of the buckle base 51 and passing through the buckle base 51, such as Figure 12 and Figure 13 In practice, when the female buckle 5 is set on the bottom plate 21, the fastening base 51 is a separate component, which can preferably adopt a plate-shaped structure or a columnar structure. When the female buckle 5 is set on the shelf 31, the fastening base 51 can be a separate component connected to the bottom of the shelf 31, or it can be a side plate 311 of the shelf 31, as shown in FIG. Figure 16 and Figure 17 shown.

[0076] In order to further improve the assembly accuracy of the counter 3, the first mounting portion 24 is further configured with a first supporting surface 236 for supporting the counter 3, and the structural position of the first supporting surface 236 is adapted to the first positioning portion 23, so that the first supporting surface 236 is used again at the position of the first mounting portion 24 to support and position the counter 3, so as to form a match with the first supporting surfaces 236 at other positions to achieve multi-point support for the counter 3, making the installation of the counter 3 more accurate, stable and secure. There are many ways to form the first supporting surface 236 on the first mounting portion 24, for example, Figure 10 As shown, the elastic arm 41 of the male buckle 4 can be connected to a supporting member 235, and the top of the supporting member 235 forms a first supporting surface 236, and the first supporting surface 236 is located below the protrusion 42 and closer to the bottom plate 21, so as to support the lower end surface of the side plate 311 of the shelf 31 (the lower end surface serves as the second supporting surface 333). Figure 15As shown, in the female buckle 5 , a protrusion 53 is constructed on the top of the fastening base 51 , and the top of the protrusion 53 forms the first supporting surface 236 so as to support the counter 3 in the female buckle 5 .

[0077] In order to further improve the disassembly efficiency of the counter 3, in a further solution, the male buckle 4 further includes a pressing handle 43 provided on the elastic arm 41, such as Figure 20 As shown, the pressing handle 43 and the protrusion 42 are arranged on the same side of the elastic arm 41, and there is a distance between the pressing handle 43 and the protrusion 42, so that the user can drive the elastic deformation of the elastic arm 41 by pressing the pressing handle 43, so that the protrusion 42 can be withdrawn from the recess 52 through the elastic deformation of the elastic arm 41, thereby achieving the purpose of faster and more labor-saving unlocking.

[0078] During implementation, the number and position of the positioning parts and the number and position of the mounting parts can be comprehensively considered so that the positioning parts and the mounting parts can form a better match, so as to simplify the structure, reduce costs and make it easier to install and remove the counter 3. For example, in a preferred embodiment, the shelf 31 includes two sets of side panels 311 arranged opposite to each other, and one set of side panels 311 is respectively provided with a second positioning part 33, such as Figure 16 、 Figure 17 、 Figure 19 and Figure 20 As shown; in another set of side panels 311, one of the side panels 311 is provided with a second mounting portion 34, and the other side panel 311 is provided with one or two second mounting portions 34. The counter 3 can be precisely positioned by the positioning portions arranged on opposite sides of the shelf 31. At the same time, the counter 3 can be securely fixed by two or three mounting portions arranged on the other opposite sides of the shelf 31. The coordinated cooperation of the positioning portions and the mounting portions can not only achieve the purpose of precise positioning, secure fixation and convenient disassembly, but also make the structure simplest, the molding process simpler and the cost lower. For example, Figure 16 、 Figure 17 and Figure 19 As shown, one group of side panels 311 of the shelf 31 is respectively provided with a support ear 331, and the support ear 331 is respectively provided with a second positioning portion 33; in the other group of side panels 311, one of the side panels 311 is provided with a second mounting portion 34, and the second mounting portion 34 adopts a male buckle 4, and the elastic arm 41 of the male buckle 4 extends out of the lower end of the shelf 31 and is provided with a pressing handle 43 for easy unlocking, and the other side panel 311 is spaced apart and provided with two second mounting portions 34, both of which adopt a female buckle 5, and the three second mounting portions 34 form a triangular structure, and the two second positioning portions 33 are respectively located on both sides of the triangular structure. Through mutual cooperation, not only a better assembly effect can be achieved, but also the disassembly of the counter 3 can be completed more quickly.

[0079] In a more complete solution, the counter 3 further includes a character wheel set 32, which includes a plurality of transmission-connected character wheels, such as Figure 19 and Figure 20 As shown, each character wheel is respectively mounted on a rotating shaft, and the rotating shaft is mounted on a frame 31. At the same time, the gas meter also includes a movement and a transmission mechanism. The housing includes a main housing 1 and a box cover 6 adapted to the base 2. The bottom plate 21 of the base 2 is connected to the outer side of the main housing 1. For example, the bottom plate 21 can be mounted on the main housing 1 by screws or bolts, and the box cover 6 is mounted on the base 2, so that the base 2 and the box cover 6 can jointly enclose an inner cavity, that is, the base 2 and the box cover 6 can jointly enclose a counter 3 box for accommodating the counter 3, as shown in FIG. Figure 1 and Figure 2 As shown, the counter 3 can be installed separately. During assembly, the movement is installed in the main housing 1, and the counter 3 is installed in the inner cavity, corresponding to the observation window 61 constructed in the box cover 6. The movement is connected to the gear set 7 through a transmission mechanism. The transmission mechanism includes a flow tooth set in the inner cavity and the flow tooth is installed between the bottom plate 21 and the counter 3. The flow tooth can be adjusted by disassembling the counter 3.

[0080] Example 3

[0081] In order to further improve the calibration efficiency of the counter 3, the main difference between this embodiment and the above embodiment is that in the counter 3 provided in this embodiment, the second positioning portion 33 on one side of the frame 31 adopts a female buckle 5, and the female buckle 5 adopts a female buckle 5 of a special structure, such as Figures 17-20 As shown, the recess 52 of the female buckle 5 is an opening constructed on the side wall of the shelf 31, and the opening passes through the lower end of the shelf 31, that is, the opening is constructed at the lower end of the side plate 311 in the shelf 31, as shown in FIG. Figure 18 and Figure 20 and the outer side of the opening is configured with a snap-fit platform 54 connected to the shelf 31; the second mating surface 521 is configured at the upper end of the snap-fit platform 54, for example, the second mating surface 521 may be the upper surface of the snap-fit platform 54, the second guide surface is configured at the lower end of the snap-fit platform 54, such as Figures 17-20 As shown, the second guide surface corresponds to the opening to guide the corresponding male buckle 4 to snap into the opening, so that the second mating surface 521 can be engaged with the first mating surface 421 of the male buckle 4. In this solution, by configuring the engagement platform 54 in the female buckle 5, the second guide surface 521 and the second mating surface 521 can be located on the outside of the side plate 311 of the rack 31. This not only prevents the male buckle 4 from being inserted into the interior of the rack 31 during installation and affecting the assembly of the gear set 7 below the rack 31, but also, after assembly is completed, the protrusion 42 of the male buckle 4 is exactly located on the outside of the side plate 311 of the rack 31, as shown in FIG. Figure 19 and Figure 20As shown, the position of the protrusion 42 is visible and unobstructed, which makes it easier to drive the protrusion 42 to exit the corresponding female buckle 5 when unlocking, and can unlock more quickly, which can significantly improve the disassembly efficiency of the counter 3, thereby further improving the calibration efficiency of the counter 3.

[0082] In a further approach, Figure 23 and Figure 24 As shown, the second mating surface 521 constructed on the buckle platform 54 is an inclined surface. At the same time, the first mating surface 421 in the male buckle 4 adapted thereto and connected to the bottom plate 21 is also constructed as an inclined surface. Figure 23 and Figure 24 As shown, at the same time, the second positioning portion 33 on the other side of the corresponding rack 31 adopts a male buckle 4, as shown in FIG. Figure 17 and Figure 21 As shown, the male buckle 4 is equipped with a pressing handle 43. When the counter 3 is assembled with the base 2, the female buckle 5 on one side of the shelf 31 and the corresponding male buckle 4 form an oblique fit through the second fitting surface 521 and the first fitting surface 421. Combined with the fit between the male buckle 4 and the corresponding female buckle 5 on the other side of the shelf 31, the counter 3 can be securely fixed. Moreover, when disassembling, the shelf 31 of the counter 3 can be separated from the base 2 by pressing the pressing handle 43 on one side with one hand and pulling the shelf 31 of the counter 3 upward away from the bottom plate 21 at the same time, thereby achieving the effect of quickly and efficiently disassembling the counter 3 with one hand, which is not only more convenient but also faster, and can further improve the calibration efficiency of the counter 3.

[0083] During implementation, the inclined plane is configured to have an inclination angle of 5-30 degrees along the horizontal direction, preferably 15-20 degrees. In this embodiment, the inclined plane is configured to have an inclination angle of 18 degrees along the horizontal direction. Figure 23 As shown, this tilt angle can not only firmly restrain the counter 3 and prevent the counter 3 from falling off, but also can easily and efficiently disassemble the counter 3 by pulling it outwards with less effort, making the disassembly more efficient and convenient.

[0084] Example 4

[0085] Based on the above-mentioned gas meter, this embodiment provides a gas meter assembly process, specifically an assembly process for improving the gas meter qualification rate, including the following steps:

[0086] Step 1: Fix the shell of the gas meter and install the base 2 on the shell. During implementation, the shell of the gas meter can be fixed at a predetermined position using a clamp or a limit mechanism to form a stable installation base for subsequent assembly. During implementation, the bottom plate 21 of the base 2 can be detachably installed on the outer side of the shell using fasteners such as bolts or screws, such as Figure 1 and Figure 2 shown.

[0087] Step 2: Install the gear set 7 in the transmission mechanism on the bottom plate 21 of the base 2. The gear set includes flow teeth. During implementation, each gear 7 in the gear set can be rotatably mounted on the bottom plate 21, and the rotation center of the gear is consistent with the height direction of the base 2.

[0088] Step 3, move the counter 3 to the top of the bottom plate 21, so that each second positioning portion 33 corresponds to each first positioning portion 23 respectively; in this step, the counter 3 can be manually moved to the top of the bottom plate 21, or the counter 3 can be automatically clamped to the top of the bottom plate 21 by a mechanism such as a robotic arm under the control of a controller, so that each second positioning portion 33 corresponds to each first positioning portion 23 respectively.

[0089] Step 4: Move the counter 3 downward so that the second positioning portion 33 forms a positioning fit with the first positioning portion 23, and the second supporting surface 333 of the counter 3 gradually approaches the first supporting surface 236 of the base 2. During this process, the second mounting portion 34 will also gradually form a fit with the first mounting portion 24. Due to the constraint and guiding effect of the positioning portion, the orientation of the counter 3 is strictly limited during this process, and there will be no left-right or up-down deviation, and there will be no meshing problem between the transmission mechanism and the character wheel group 32 due to the deviation of the counter 3, thereby effectively ensuring the installation accuracy.

[0090] Step 5: Continue to move the counter 3 downward until the second support surface 333 is in contact with the first support surface 236. At this point, the male buckles 4 are also properly engaged with the corresponding female buckles 5, and the flow teeth are exactly located between the counter 3 and the base plate 21. The counter 3 is assembled. This assembly method is not only simple and efficient, but also allows for more convenient automated assembly. It also effectively ensures the installation accuracy of the counter 3 and the consistency of the counter 3 assembly in each gas meter, thereby further improving the production efficiency of gas meters and further improving the pass rate of gas meters.

[0091] The above description is only a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with this technical field can easily think of changes or replacements within the technical scope disclosed by the present invention, which should be covered by the scope of protection of the present invention.

Claims

1. A gas meter comprising a base and a counter, wherein the base comprises a bottom plate and the counter comprises a shelf, wherein: The base plate is constructed with at least two first mounting portions and at least two positioning components, and among the positioning components, at least one end facing away from the base plate is constructed with a first positioning portion, and the shelf is constructed with at least two second mounting portions adapted to the first mounting portions and at least two second positioning portions adapted to the first positioning portions, the installation position of the counter is positioned by the cooperation of the first positioning portions and the second positioning portions, and the counter is detachably mounted on the base by the cooperation of the first mounting portions and the second mounting portions; The first positioning portion is a positioning hole, and the second positioning portion is a positioning post adapted to the positioning hole; or the first positioning portion is a positioning post, and the second positioning portion is a positioning hole adapted to the positioning post; The top of the first positioning portion is configured with a guide portion; The positioning component is further configured with a first supporting surface for supporting the counter, and the first supporting surface is configured at a position adapted to the first positioning portion, and a second supporting surface adapted to the first supporting surface is configured at the lower end of the shelf, and the installation height of the counter is positioned by the cooperation between the first supporting surface and the second supporting surface; The bottom plate is further provided with a plurality of supporting components for supporting the counter. The top of the supporting component is configured with a first supporting surface for supporting the counter, and the structural position of the first supporting surface is adapted to the first positioning portion. The lower end of the shelf is configured with a second supporting surface adapted to the first supporting surface. The installation height of the counter is positioned by the cooperation between the first supporting surface and the second supporting surface. A support ear is provided on the side of the rack, the second positioning portion is constructed on the support ear, and the second support surface is constructed at the lower end of the support ear; a gear set in the transmission mechanism is installed on the bottom plate of the base, and the gear set includes flow teeth.

2. The gas meter according to claim 1, characterized in that The frame is structured with a cavity for installing the character wheel set, the lower end of the frame is structured with an opening connected to the cavity, and the corresponding upper end is structured with a window adapted to the character wheel set. When the frame is installed on the base, the opening corresponds to the bottom plate.

3. The gas meter according to claim 1, characterized in that The shelf comprises two groups of side panels arranged opposite to each other, wherein one group of side panels is respectively provided with a second positioning portion, and the other group of side panels comprises one side panel provided with a second mounting portion and the other side panel provided with one or two second mounting portions.

4. The gas meter according to any one of claims 1 to 3, characterized in that: The base is an integrally formed plastic part, and / or the frame is an integrally formed plastic part; And / or, the counter further comprises a character wheel assembly, wherein the character wheel assembly comprises a plurality of transmission-connected character wheels, each character wheel is respectively mounted on a rotating shaft, and the rotating shaft is mounted on a frame.

5. The gas meter according to claim 4, characterized in that: It also includes a movement and a transmission mechanism. The housing includes a main housing and a box cover adapted to the base. The bottom plate of the base is connected to the outside of the main housing. The box cover is installed on the base. The base and the box cover together form an inner cavity. The movement is installed in the main housing, the counter is installed in the inner cavity, the movement is connected to the gear set through a transmission mechanism, the transmission mechanism includes a flow tooth arranged in the inner cavity, and the flow tooth is installed between the bottom plate and the counter.

6. A gas meter assembly process, comprising the following steps: Step 1: Fix the housing of the gas meter and install the base on the housing; Step 2: Install the gear set in the transmission mechanism on the bottom plate of the base, wherein the gear set includes flow gears; Step 3: Move the counter to the top of the bottom plate so that each second positioning portion corresponds to each first positioning portion; Step 4: Move the counter downward so that the second positioning portion forms a positioning fit with the first positioning portion, and the second supporting surface of the counter gradually approaches the first supporting surface of the base. At the same time, the second mounting portion gradually forms a fit with the first mounting portion. Step 5. Continue to move the counter downward until the second support surface is in contact with the first support surface. At this point, the male buckles are respectively snapped into the corresponding female buckles, and the flow teeth are located between the counter and the base plate. The counter is assembled.

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