Gas meter sampling and counting device and gas meter

Abstract

The utility model belongs to the technical field of gas meter sampling and counting devices, and particularly relates to a gas meter sampling and counting device and a gas meter. The gas meter sampling and counting device comprises a support, a sampling assembly and a non-return piece. Wherein the sampling assembly can be rotationally connected to the bracket; the non-return piece comprises a non-return piece body and anti-rotation teeth arranged on the non-return piece body in a protruding mode, the non-return piece body is rotatably connected to the support, and when the sampling assembly rotates reversely, the sampling assembly abuts against the anti-rotation teeth. According to the technical scheme, under the normal working condition of the sampling and counting device for the gas meter, the sampling gear drives the ratchet wheel to rotate forwards, the non-return piece cannot interfere with forward rotation of the ratchet wheel, and when the sampling gear swings abnormally and rotates reversely, the non-return piece limits reverse rotation of the ratchet wheel, so that reverse rotation of the sampling gear is prevented; counting errors caused by reverse rotation of the sampling gear are effectively avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of gas meter sampling and counting devices, in particular to a gas meter sampling and counting device and a gas meter. Background Art

[0002] The gas meter has an automatic accumulation function. Users can directly read the numbers on the word wheel group through the window on the gas meter. The sampling gear meshes and drives with the output gear or the word wheel group, converting the mechanical movement of the output gear into an electronic signal, thereby realizing the measurement of electronic readings.

[0003] When the input gear on the gas meter is in the non-gas-passing state, it has a certain amount of rotational movement angle. Through multi-stage gear transmission to the sampling gear, there will be a certain amount of left-right rotational movement angle. Especially when subjected to high-frequency vibration, the input gear rotates significantly left and right. The rotation of the input gear is transmitted to the sampling gear through multi-stage gears. The swing of the input gear causes the sampling gear to vibrate or abnormally swing. Under normal circumstances, the sampling gear rotates forward for counting, while the reverse rotation of the sampling gear will cause counting errors, resulting in inaccurate readings.

[0004] Therefore, it is urgent to propose a gas meter sampling and counting device and a gas meter to solve the above problems. Summary of the Utility Model

[0005] The purpose of the utility model is to at least solve the problem of mis-counting caused by the reverse rotation of the sampling gear. This purpose is achieved through the following technical solutions:

[0006] The first aspect of the utility model proposes a gas meter sampling and counting device, comprising:

[0007] A bracket;

[0008] A sampling assembly, which is rotatably connected to the bracket;

[0009] A reverse prevention member, which includes a reverse prevention member body and an anti-rotation tooth protruding from the reverse prevention member body. The reverse prevention member body is rotatably connected to the bracket. When the sampling assembly rotates reversely, the sampling assembly abuts against the anti-rotation tooth.

[0010] Under normal working conditions, the sampling assembly rotates forward, and the reverse prevention member does not interfere with the forward rotation of the sampling assembly. When the sampling assembly swings abnormally and rotates reversely, the sampling assembly drives the reverse prevention member body to rotate until the anti-rotation tooth abuts against the sampling assembly, so that the reverse prevention member restricts the reverse rotation of the sampling assembly, thereby preventing the reverse rotation amplitude of the sampling assembly from being too large, and effectively avoiding the counting error caused by the too large reverse rotation amplitude of the sampling assembly.

[0011] In addition, the gas meter sampling and counting device according to the present utility model may further have the following additional technical features:

[0012] In some embodiments of the present utility model, the sampling assembly has a first abutting portion, the anti-rotation tooth includes a convex tooth and a second abutting portion, and when the sampling assembly rotates reversely, the anti-rotation member can be driven to rotate forward by driving the convex tooth until the outer sides of the first abutting portion and the second abutting portion abut.

[0013] In some embodiments of the present utility model, a first limiting portion is connected to the anti-rotation member body, a second limiting portion is provided on the bracket, and when the sampling assembly rotates forward, the convex tooth and the sampling assembly are in sliding contact, and the first limiting portion and the second limiting portion abut.

[0014] In some embodiments of the present utility model, an elastic cantilever is provided along a part of the outer circumference of the anti-rotation member body, one end of the cantilever is connected to the anti-rotation member body, and the other end of the cantilever is connected to the first limiting portion. When the first limiting portion and the second limiting portion abut, the restoring force of the cantilever itself makes the anti-rotation member have a tendency to rotate forward.

[0015] In some embodiments of the present utility model, an installation groove is provided on the bracket, the anti-rotation member is arranged in the installation groove, and a part of the groove wall of the installation groove is recessed outward to form the second limiting portion.

[0016] In some embodiments of the present utility model, a protruding installation portion is provided in the installation groove, and the anti-rotation member is rotatably sleeved on the installation portion.

[0017] In some embodiments of the present utility model, a buckle is provided on the installation portion, a retaining ring is sleeved on the buckle, a through hole is provided on the anti-rotation member body, and the outer diameter of the retaining ring is larger than the inner diameter of the through hole.

[0018] In some embodiments of the present utility model, the sampling assembly includes a sampling gear and a ratchet wheel, the ratchet wheel is connected to the sampling gear and can rotate synchronously with the sampling gear, the outer diameter of the ratchet wheel is larger than the outer diameter of the sampling gear, the number of teeth of the ratchet wheel is larger than the number of teeth of the sampling gear, and the first abutting portion is the ratchet teeth of the ratchet wheel.

[0019] In some embodiments of the present utility model, a connection hole is provided at the center of the ratchet wheel, a connection portion is provided at the center of the sampling gear, the ratchet wheel is sleeved on the connection portion through the connection hole, and the rotation of the ratchet wheel can drive the connection portion to rotate synchronously.

[0020] The present utility model also provides a gas meter, which includes an input gear and the gas meter sampling and counting device in the above-described embodiment, and the input gear is in driving connection with the sampling assembly. Description of the Drawings

[0021] By reading the following detailed description of the preferred embodiments, various other advantages and benefits will become clear to those of ordinary skill in the art. The drawings are only for the purpose of showing the preferred embodiments and are not considered to be a limitation of the present utility model. Moreover, throughout the drawings, the same reference numerals are used to represent the same components. In the drawings:

[0022] Figure 1 is a schematic structural view of the gas meter sampling and counting device provided by the present utility model;

[0023] Figure 2 is a schematic structural view of the check valve provided by the present utility model;

[0024] Figure 3 is a partial schematic structural view of the gas meter sampling and counting device (when the sampling gear rotates forward) provided by the present utility model;

[0025] Figure 4 is a partial schematic structural view of the gas meter sampling and counting device (when the sampling gear rotates reversely) provided by the present utility model;

[0026] Figure 5 is a schematic structural view of the sampling gear provided by the present utility model;

[0027] Figure 6 is an exploded view of the gas meter sampling and counting device provided by the present utility model;

[0028] Figure 7 is a schematic structural view of the gas meter provided by the present utility model.

[0029] In the figures:

[0030] 100, bracket; 110, installation groove; 120, second limiting part; 130, installation part; 140, buckle; 150, retaining ring; 160, connecting shaft; 200, sampling assembly; 210, sampling gear; 211, connecting part; 212, jack; 213, tray; 220, ratchet; 221, connecting hole; 222, first abutting part; 300, check valve; 310, check valve body; 320, anti-rotation teeth; 321, convex teeth; 322, second abutting part; 330, first limiting part; 340, cantilever; 400, light reflecting part; 500, retaining ring; 600, word wheel assembly; 610, first word wheel; 710, first transmission gear; 720, second transmission gear; 730, third transmission gear; 740, fourth transmission gear; 800, input gear. Detailed Implementation Modes

[0031] The exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided so that the present disclosure can be more thoroughly understood and the scope of the present disclosure can be fully conveyed to those skilled in the art.

[0032] It should be understood that the terms used herein are for the purpose of describing specific exemplary embodiments only and are not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms "a", "an", and "the" as used herein may also include the plural forms. The terms "comprising", "including", "containing", and "having" are inclusive and thus specify the presence of the stated features, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or combinations thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring them to be performed in the particular order described or illustrated, unless the order of performance is explicitly stated. It should also be understood that additional or alternative steps may be used.

[0033] Although the terms first, second, third, etc. may be used herein to describe multiple elements, components, regions, layers, and / or sections, these elements, components, regions, layers, and / or sections should not be limited by these terms. These terms may be used only to distinguish one element, component, region, layer, or section from another. Unless the context clearly indicates otherwise, terms such as "first", "second", and other numerical terms do not imply an order or sequence when used herein. Thus, the first element, component, region, layer, or section discussed below may be referred to as the second element, component, region, layer, or section without departing from the teachings of the exemplary embodiments.

[0034] For ease of description, spatial relative relationship terms may be used in the text to describe the relationship of one element or feature shown in the figure relative to another element or feature. These relative relationship terms are, for example, "inside", "outside", "inner side", "outer side", "below", "beneath", "above", "overhead", etc. Such spatial relative relationship terms are intended to include different orientations of the device during use or operation other than the orientations depicted in the figure. For example, if the device in the figure is flipped, an element described as "below other elements or features" or "beneath other elements or features" will subsequently be oriented as "above other elements or features" or "overhead other elements or features". Therefore, the example term "below" can include the upper and lower orientations. The device may be otherwise oriented (rotated 90 degrees or in other directions) and the spatial relative relationship descriptors used in the text are accordingly interpreted.

[0035] Refer to Figure 1 and Figure 2 , this embodiment provides a gas meter sampling and counting device, including a bracket 100, a sampling assembly 200 and a check member 300; wherein, the sampling assembly 200 is rotatably connected to the bracket 100; the check member 300 includes a check member main body 310 and an anti-rotation tooth 320 protruding from the check member main body 310, the check member main body 310 is rotatably connected to the bracket 100, and when the sampling assembly 200 rotates reversely, the sampling assembly 200 abuts against the anti-rotation tooth 320.

[0036] Under normal working conditions, the sampling assembly 200 rotates forward, and the check member 300 does not interfere with the forward rotation of the sampling assembly 200. When the sampling assembly 200 swings abnormally and rotates reversely, the sampling assembly 200 drives the check member main body 310 to rotate until the anti-rotation tooth 320 abuts against the sampling assembly 200, so that the check member 300 restricts the reverse rotation of the sampling assembly 200, thereby preventing the reverse rotation amplitude of the sampling assembly 200 from being too large, and effectively avoiding the counting error caused by the too large reverse rotation amplitude of the sampling assembly 200.

[0037] Further, refer to Figures 2 to 4 , the sampling assembly 200 has a first abutting portion 222, the anti-rotation tooth 320 includes a convex tooth 321 and a second abutting portion 322, and the reverse rotation of the sampling assembly 200 can drive the convex tooth 321 to rotate the check member 300 forward until the outer sides of the first abutting portion 222 and the second abutting portion 322 abut. The check member main body 310 is cylindrical, and the anti-rotation tooth 320 protrudes from the outer periphery of the check member main body 310. When the sampling assembly 200 rotates reversely, it will drive the convex tooth 321 to drive the check member 300 to rotate, but after the convex tooth 321 rotates a certain angle, the first abutting portion 222 will abut against the outer side of the second abutting portion 322, thereby preventing the check member 300 from continuing to rotate.

[0038] Furthermore, a first limiting portion 330 is connected to the check valve body 310, and a second limiting portion 120 is provided on the bracket 100. When the sampling assembly 200 rotates forward, the convex teeth 321 are in sliding contact with the sampling assembly 200, and the first limiting portion 330 abuts against the second limiting portion 120. In some embodiments, when the sampling assembly 200 rotates forward, the convex teeth 321 are in sliding contact with the sampling assembly 200, thereby buffering the rotation of the sampling assembly 200 and achieving a certain noise reduction effect, thus improving the product quality of the gas meter sampling and counting device. By providing the first limiting portion 330 on the check valve 300, it is possible to prevent the check valve 300 from rotating reversely too much when the sampling assembly 200 rotates forward, so as to ensure that the sampling assembly 200 can always be in contact with the convex teeth 321. Furthermore, when the sampling assembly 200 rotates reversely, the sampling assembly 200 can drive the check valve 300 to rotate forward through the convex teeth 321 until the sampling assembly 200 abuts against the outside of the second abutting portion 322, and the check valve function of the check valve 300 is exerted.

[0039] Furthermore, an elastic cantilever 340 is provided along a part of the outer periphery of the check valve body 310. One end of the cantilever 340 is connected to the check valve body 310, and the other end of the cantilever 340 is connected to the first limiting portion 330. When the first limiting portion 330 abuts against the second limiting portion 120, the restoring force of the cantilever 340 itself makes the check valve 300 have a tendency to rotate forward. It can be understood that the cantilever 340 is arc-shaped and has a certain length, and the shape characteristics of the cantilever 340 endow it with a certain elasticity. In the case where the sampling assembly 200 rotates forward, the sampling assembly 200 makes the check valve 300 have a tendency to rotate reversely, while the restoring force of the cantilever 340 itself makes the check valve 300 have a tendency to rotate forward, which enables the convex teeth 321 to always be in contact with the sampling assembly 200, avoiding the situation where the check valve 300 cannot drive the check valve 300 to rotate forward due to the excessive distance between the sampling assembly 200 and the convex teeth 321 when the sampling assembly 200 rotates reversely. If the sampling assembly 200 cannot be in contact with the convex teeth 321, then the sampling assembly 200 may not be able to drive the check valve 300 to rotate to the position where the second abutting portion 322 abuts against the first abutting portion 222 through the convex teeth 321, and the check valve 300 will not be able to play the role of preventing the sampling assembly 200 from rotating reversely.

[0040] Furthermore, an installation groove 110 is provided on the bracket 100, the check valve 300 is arranged in the installation groove 110, and a part of the groove wall of the installation groove 110 is recessed outward to form the second limiting portion 120. It can be that the groove wall of the installation groove 110 is set according to the shape of the outside of the first limiting portion 330. In some embodiments, the second limiting portion 120 can also be a limiting block protruding from the surface of the bracket 100.

[0041] Further, a raised mounting portion 130 is provided in the mounting groove 110, and the check member 300 is rotatably sleeved on the mounting portion 130. Exemplarily, the mounting portion 130 is a cylindrical protrusion. In some embodiments, a rotating shaft may be provided on the check member 300, and a circular groove may be provided on the bracket 100, and the rotating shaft is rotatably inserted into the circular groove.

[0042] Further, a buckle 140 is provided on the mounting portion 130, a retaining ring 150 is sleeved on the buckle 140, a through hole is provided in the check member body 310, and the outer diameter of the retaining ring 150 is larger than the inner diameter of the through hole. Optionally, the retaining ring 150 is an annular elastic member, the inner diameter of the retaining ring 150 is slightly smaller than the outer diameter of the buckle 140, and during installation, the retaining ring 150 can be expanded by the buckle 140, and when the installation is completed, it can contract under the action of its own elastic restoring force. Exemplarily, the material of the retaining ring 150 may be rubber or silica gel.

[0043] Further, referring to Figure 5 and Figure 6 , the sampling assembly 200 includes a sampling gear 210 and a ratchet 220. The ratchet 220 is connected to the sampling gear 210 and can rotate synchronously with the sampling gear 210. The outer diameter of the ratchet 220 is larger than the outer diameter of the sampling gear 210, the number of teeth of the ratchet 220 is larger than the number of teeth of the sampling gear 210, and the first abutting portion 222 is the ratchet tooth of the ratchet 220. It can be understood that since the sampling gear 210 and the ratchet 220 rotate synchronously, when the ratchet tooth of the ratchet 220 abuts against the anti-rotation tooth 320, the sampling gear 210 cannot continue to rotate reversely. By setting the outer diameter of the ratchet 220 to be larger than the outer diameter of the sampling gear 210 and setting the number of teeth of the ratchet 220 to be larger than the number of teeth of the sampling gear 210, the reverse rotation amplitude of the sampling gear 210 can be reduced, and the counting error caused by the too large reverse rotation amplitude of the sampling gear 210 can be avoided.

[0044] Further, a connection hole 221 is provided at the center of the ratchet 220, a connection portion 211 is provided at the center of the sampling gear 210, and the ratchet 220 is sleeved on the connection portion 211 through the connection hole 221, and the rotation of the ratchet 220 can drive the connection portion 211 to rotate synchronously. The socket connection method is very simple to operate and has stable transmission. Optionally, the connection portion 211 may be a square protrusion, a cross-shaped protrusion or a kidney-shaped protrusion, etc., and correspondingly, the connection hole 221 is a square hole, a cross-shaped hole or a kidney-shaped hole.

[0045] Further, a connecting shaft 160 is provided on the bracket 100. A jack 212 is provided at the center of the connecting portion 211. The connecting portion 211 is inserted into the connecting shaft 160 through the jack 212, and the sampling gear 210 can rotate around the connecting shaft 160. The sampling gear 210 is connected to the bracket 100 in a plug-in manner, which is convenient for assembly and can ensure smooth rotation. Optionally, the connecting hole 221 is a through hole, and the connecting shaft 160 can pass through the connecting hole 221. Optionally, the connecting shaft 160 is a stepped shaft with a smaller diameter at the top. After the sampling assembly 200 is inserted into the connecting shaft 160, a retaining ring 500 is sleeved on the top of the connecting shaft 160 to prevent the sampling assembly 200 from disengaging from the connecting shaft 160.

[0046] Further, in some embodiments, the gas meter counting device is an optoelectronic metering device. Therefore, the gas meter sampling counting device further includes an optoelectronic sensor. A light reflecting member 400 is provided on the sampling gear 210, and the optoelectronic sensor and the light reflecting member 400 are correspondingly arranged. Optionally, a tray 213 is provided on the side of the sampling gear 210 facing away from the connecting portion 211, and the light reflecting member 400 is provided in the tray 213. Optionally, the light reflecting member 400 includes a black reflecting member and a white reflecting member, and both the black reflecting member and the white reflecting member are semicircular and symmetrically arranged.

[0047] Optionally, the gas meter counting device further includes a micro control unit. The light reflecting member 400 rotates with the sampling gear 210. When the optoelectronic sensor recognizes a white medium, the optoelectronic sensor transmits a voltage signal to the micro control unit. When the optoelectronic sensor recognizes a black medium, the optoelectronic sensor transmits another voltage signal to the micro control unit. The micro control unit realizes the metering function by distinguishing different voltage signals. Among them, the setting of the micro control unit and the signal connection between the micro control unit and the optoelectronic sensor are mature prior arts in the field and will not be described in detail here.

[0048] Further, the gas meter sampling counting device includes a dial wheel assembly 600 and a first transmission gear assembly. The first transmission gear assembly is meshed and driven with the dial wheel assembly 600 and the sampling gear 210 respectively. Optionally, a groove for installing the dial wheel assembly 600 is provided on the bracket 100. The dial wheel assembly 600 includes a first dial wheel 610, and the first dial wheel 610 is drivingly connected to the sampling gear 210 through the first transmission gear assembly. In some embodiments, the first transmission gear assembly includes a first transmission gear 710 and a second transmission gear 720 that are drivingly connected. In some other embodiments, the number of gears in the first transmission gear assembly can also be three, four, five, etc., which are not specifically limited here. Of course, the first dial wheel 610 can also be directly meshed and driven with the sampling gear 210, or be drivingly connected to the sampling gear 210 through a transmission gear.

[0049] Further, refer to Figure 7, this embodiment also provides a gas meter, which includes an input gear 800 and the gas meter sampling and counting device in the above embodiment. The input gear 800 is in transmission connection with the sampling assembly 200. By providing a reverse prevention member 300 on the bracket 100 that can prevent the sampling assembly 200 from rotating reversely, the counting error caused by the reverse rotation of the sampling assembly 200 can be prevented.

[0050] Optionally, the gas meter further includes a second transmission gear assembly. The input gear 800 is in meshing transmission with the second transmission gear assembly, and the second transmission gear assembly is in meshing transmission with the sampling assembly 200 through the first transmission gear assembly. In this embodiment, the second transmission gear assembly includes a third transmission gear 730 and a fourth transmission gear 740. In other embodiments, the number of gears in the second transmission gear assembly can also be three, four, five, etc. Of course, the input gear 800 can also be in meshing transmission with the first transmission gear assembly directly or through a transmission gear and the first transmission gear assembly.

[0051] The working principle of the gas meter in this embodiment is as follows:

[0052] Under normal working conditions, the input gear 800 drives the sampling gear 210 to rotate forward through the first transmission gear assembly and the second transmission gear assembly. The ratchet 220 rotates forward synchronously with the sampling gear 210. The ratchet 220 contacts the anti-rotation teeth 320 on the reverse prevention member 300 to obtain buffering. At the same time, the first limiting portion 330 on the anti-rotation teeth 320 abuts against the second limiting portion 120 on the bracket 100 to prevent the reverse prevention member 300 from being driven by the ratchet 220. At this time, the photoelectric sensor can recognize the accurate light reflection light and send a voltage signal to the micro control unit.

[0053] When the input gear 800 rotates reversely, through the transmission of the first transmission gear assembly and the second transmission gear assembly, the sampling gear 210 rotates reversely, and the ratchet 220 rotates reversely synchronously with the sampling gear 210. At this time, the ratchet 220 drives the reverse prevention member 300 to rotate slightly until the ratchet teeth of the ratchet 220 abut against the anti-rotation teeth 320 on the reverse prevention member 300, and the ratchet 220 cannot continue to rotate, thereby preventing the sampling gear 210 from rotating reversely and avoiding the photoelectric sensor from collecting incorrect reflected light and causing false counting.

[0054] Obviously, the above embodiments of the present utility model are merely examples for clearly illustrating the present utility model, rather than limitations on the implementation manners of the present utility model. For those of ordinary skill in the art, various obvious changes, re-adjustments and substitutions can be made without departing from the protection scope of the present utility model. It is not necessary and impossible to enumerate all the implementation manners here. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present utility model shall be included within the protection scope of the claims of the present utility model.

Claims

1. A gas meter sampling and counting device, characterized in that, Comprising: A bracket (100); A sampling assembly (200), which is rotatably connected to the bracket (100); A check member (300), the check member (300) includes a check member body (310) and an anti-rotation tooth (320) protruding from the check member body (310), the check member body (310) is rotatably connected to the bracket (100), and when the sampling assembly (200) rotates reversely, the sampling assembly (200) abuts against the anti-rotation tooth (320).

2. The gas meter sampling and counting device according to claim 1, characterized in that, The sampling assembly (200) has a first abutting portion (222), the anti-rotation tooth (320) includes a protruding tooth (321) and a second abutting portion (322), and when the sampling assembly (200) rotates reversely, it can drive the protruding tooth (321) to make the check member (300) rotate forward until the outer sides of the first abutting portion (222) and the second abutting portion (322) abut.

3. The gas meter sampling and counting device according to claim 2, wherein The check member body (310) is connected with a first limiting portion (330), and a second limiting portion (120) is arranged on the bracket (100). When the sampling assembly (200) rotates forward, the protruding tooth (321) and the sampling assembly (200) are in sliding contact, and the first limiting portion (330) and the second limiting portion (120) abut.

4. The gas meter sampling and counting device according to claim 3, characterized in that, An elastic cantilever (340) is arranged along a part of the outer circumference of the check member body (310). One end of the cantilever (340) is connected to the check member body (310), and the other end of the cantilever (340) is connected to the first limiting portion (330). When the first limiting portion (330) and the second limiting portion (120) abut, the restoring force of the cantilever (340) itself makes the check member (300) have a tendency to rotate forward.

5. The gas meter sampling and counting device according to claim 3, characterized in that, An installation groove (110) is arranged on the bracket (100), the check member (300) is arranged in the installation groove (110), and a part of the groove wall of the installation groove (110) is recessed outward to form the second limiting portion (120).

6. The gas meter sampling and counting device according to claim 5, characterized in that, A protruding installation portion (130) is arranged in the installation groove (110), and the check member (300) is rotatably sleeved on the installation portion (130).

7. The gas meter sampling and counting device according to claim 6, characterized in that, A buckle (140) is arranged on the installation portion (130), a retaining ring (150) is sleeved on the buckle (140), the check member body (310) is provided with a through hole, and the outer diameter of the retaining ring (150) is larger than the inner diameter of the through hole.

8. The gas meter sampling and counting device according to any one of claims 2-7, characterized in that The sampling assembly (200) includes a sampling gear (210) and a ratchet wheel (220), the ratchet wheel (220) and the sampling gear (210) are connected and can rotate synchronously with the sampling gear (210), the outer diameter of the ratchet wheel (220) is larger than the outer diameter of the sampling gear (210), the number of teeth of the ratchet wheel (220) is larger than the number of teeth of the sampling gear (210), and the first abutting portion (222) is the ratchet tooth of the ratchet wheel (220).

9. The gas meter sampling and counting device according to claim 8, characterized in that, A connection hole (221) is provided at the center of the ratchet wheel (220), a connection part (211) is provided at the center of the sampling gear (210), the ratchet wheel (220) is sleeved on the connection part (211) through the connection hole (221), and the rotation of the ratchet wheel (220) can drive the connection part (211) to rotate synchronously.

10. A gas meter, characterized in that, The gas meter includes an input gear (800) and the gas meter sampling and counting device according to any one of claims 1-9, and the input gear (800) is in transmission connection with the sampling assembly (200).

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