阅读说明：本技术 一种带止逆装置的膜式燃气表 (Diaphragm gas meter with non-return device ) 是由 张向召 周文辉 刘彦君 冯鑫 欧阳浩宇 马振奇 牛乐 陈青玉 李少锋 范珍星 于 2021-07-13 设计创作，主要内容包括：本发明公开了一种带止逆装置的膜式燃气表,包括支架、过渡齿轮、止逆销和止逆筒,支架与膜式燃气表的机芯固定连接,过渡齿轮在膜式燃气表的曲柄齿轮带动下转动,并与传动轮配合,过渡齿轮转动安装在支架上,过渡齿轮设置开口向下的止逆筒,止逆筒内滑动安装有止逆销,支架顶面开设跑道槽,跑道槽设置在止逆销运动轨迹上,过渡齿轮正向旋转时,止逆销可从跑道槽滑出,过渡齿轮反向旋转时,止逆销被跑道槽限制。本发明在过渡齿轮反转时止逆销被限位面限制滑行,起到防止过渡齿轮反向转动的作用,保证计量结果的精确,结构简单、零件少、装配紧凑,支架不易变形。(The invention discloses a diaphragm gas meter with a non-return device, which comprises a support, a transition gear, a non-return pin and a non-return cylinder, wherein the support is fixedly connected with a core of the diaphragm gas meter, the transition gear is driven by a crank gear of the diaphragm gas meter to rotate and is matched with a transmission wheel, the transition gear is rotatably installed on the support, the transition gear is provided with the non-return cylinder with a downward opening, the non-return pin is slidably installed in the non-return cylinder, the top surface of the support is provided with a runway groove, the runway groove is arranged on the motion trail of the non-return pin, when the transition gear rotates in the forward direction, the non-return pin can slide out of the runway groove, and when the transition gear rotates in the reverse direction, the non-return pin is limited by the runway groove. The invention has the advantages that the non-return pin is limited by the limiting surface to slide when the transition gear rotates reversely, the reverse rotation of the transition gear is prevented, the accuracy of the metering result is ensured, the structure is simple, the number of parts is small, the assembly is compact, and the support is not easy to deform.)

1. The utility model provides a diaphragm type gas table of taking non return means, includes support (100), transition gear (200), its characterized in that: the ratchet mechanism also comprises a ratchet cylinder (210) and a ratchet pin (300);

the support (100) is fixedly connected with a machine core of the diaphragm gas meter, a transition gear (200) is driven by a crank gear of the diaphragm gas meter to rotate and is matched with a driving wheel, and the transition gear (200) is rotatably arranged on the support (100);

the transition gear (200) is provided with a non-return cylinder (210) with a downward opening, and a non-return pin (300) is arranged in the non-return cylinder (210) in a sliding manner;

a runway groove (110) is formed in the top surface of the bracket (100), and the runway groove (110) is arranged on the motion track of the backstop pin (300);

when the transition gear (200) rotates in the forward direction, the backstop pin (300) can slide out of the runway groove (110);

when the transition gear (200) is rotated in the reverse direction, the backstop pin (300) is restricted by the raceway groove (110).

2. A diaphragm gas meter with a back stop as set forth in claim 1, wherein: in the motion direction of the backstop pin (300), the runway groove (110) is provided with an arc surface and a limiting surface;

the arc-shaped surface is an arc surface which is formed by smoothly transiting the bottom surface of the runway groove (110) to the top surface of the bracket (100);

the limiting surface is a vertical surface vertical to the bottom surface of the runway groove (110).

3. A diaphragm gas meter with a back stop as claimed in claim 1 or 2, wherein: the ratchet mechanism further comprises a compression spring (400), wherein the compression spring (400) is installed between the top of the backstop pin (300) and the bottom of the backstop barrel (210).

4. A diaphragm gas meter with a back stop as set forth in claim 3, wherein: the number of the non-return cylinders (210) is two, and the non-return cylinders are symmetrically arranged in the radial direction of the transition gear (200).

5. The diaphragm gas meter with a back stop device of claim 4, wherein: the non-return pin (300) is a round shaft pin made of 304 stainless steel.

6. The diaphragm gas meter with a back stop device of claim 5, wherein: the non-return cylinder (210) and the transition gear (200) are integrated.

Technical Field

The invention relates to the field of diaphragm gas meters, in particular to a diaphragm gas meter with a non-return device.

Background

The diaphragm gas meter is a flow meter for measuring combustible gas, wherein the structure of a rotary diaphragm gas meter which is commonly used is shown in figure 1, gas enters a measuring chamber from a gas inlet to push a diaphragm to swing freely, the movement of a diaphragm assembly drives a connecting rod 09 through a rocker 08 and enables a valve cover 010 to do rotary movement, so that each measuring chamber is controlled to be sequentially inflated and exhausted, the gas meter continuously and circularly moves, the connecting rod 09 drives a crank gear 06 to rotate, the crank gear 06 drives an output wheel 05 through a transition gear 04, the output wheel 05 drives a counter to count, and finally the gas quantity of the gas meter is displayed through the counter, so that the purpose of measuring the gas flow is achieved.

The counter in the current gas meter can only rotate towards one direction and display numerical values, after some illegal persons know the working principle of the membrane gas meter, the gas inlet and the gas outlet of the membrane gas meter are respectively connected with the gas outlet and the gas inlet of the gas pipe through a reverse connection pipeline, the track of continuous circular motion in the gas meter is opposite to the normal work, when the counter rotates reversely, the counter cannot count normally, and the counter rotates reversely, so that the counter counts reversely, namely, reverses, the phenomenon that the gas is stolen by utilizing the reverse connection pipeline occurs, and the loss is caused to a gas company.

With the wide application of the market, the application requirement on the gas meter is higher and higher, and the national standard also has detailed requirements on the non-return function of the membrane gas meter. In order to meet the market, the diaphragm gas meter is also skillfully designed in development, and a non-return structure is applied. For example, chinese patent document CN205808488U discloses a diaphragm gas meter retaining assembly, as shown in fig. 2-4, which includes a bracket 1 and a driving wheel 2, the bracket has a mounting hole, the middle portion of the driving wheel 2 has a rotating shaft extending into the mounting hole and capable of rotating along the circumferential direction of the mounting hole, the edge of the driving wheel 2 has an opening 22, the bracket 1 is hinged with a retaining member 3, one end of the retaining member 3 is provided with a tip 30, when the gas meter normally moves in the correct direction, the driving wheel 2 normally rotates, and the driving wheel 2 and the retaining member 3 smoothly operate without interference; when the gas meter is reversely mounted or reversely blown, the driving wheel 2 reversely rotates, the tip 30 of the retaining piece 3 extends into the opening 22, and the driving wheel 2 cannot run, so that the purpose of retaining is achieved. The non-return device requires that a position for installing the driving wheel 2 and the backstop 3 is reserved on the side surface of the bracket, the manufacturing structure of the bracket is more complex, and the bracket is of a cantilever type structure, so that the deformation is easily caused by the single-side stress, and the stability and the precision of the measurement are further influenced.

Disclosure of Invention

The invention provides a diaphragm gas meter with a non-return device, which aims to solve the problems of complex structure, multiple parts and deformation of a support caused by stress in the prior art.

The technical scheme of the invention is as follows:

a diaphragm gas meter with a non-return device comprises a support, a transition gear, a non-return cylinder and a non-return pin;

the support is fixedly connected with a machine core of the diaphragm gas meter, the transition gear is driven by a crank gear of the diaphragm gas meter to rotate and is matched with the driving wheel, and the transition gear is rotatably installed on the support;

the transition gear is provided with a non-return cylinder with a downward opening, a non-return pin is slidably mounted in the non-return cylinder, and the non-return pin can slide downwards along the non-return cylinder under the action of gravity;

the top surface of the bracket is provided with a runway groove which is arranged on the motion track of the non-return pin;

when the transition gear rotates in the forward direction, the backstop pin can slide out of the runway groove;

when the transition gear rotates reversely, the backstop pin is limited by the runway groove.

Furthermore, in the moving direction of the check pin, the runway groove is provided with an arc surface and a limiting surface;

the arc-shaped surface is an arc surface which is smoothly transited from the bottom surface of the runway slot to the top surface of the bracket;

the limiting surface is a vertical surface vertical to the bottom surface of the runway groove, so that the arc-shaped surface can enable the non-return pin to smoothly slide from the bottom of the runway to the top surface of the bracket when the transition gear rotates in the forward direction, and the transition gear normally operates; when the transition gear rotates reversely, the limiting surface limits the non-return pin in the runway groove and cannot slide further, and the transition gear is limited to operate and cannot operate normally, so that the non-return function is achieved.

Furthermore, the gas meter further comprises a compression spring, wherein the compression spring is arranged between the top of the non-return pin and the bottom of the non-return cylinder, so that the non-return pin cannot slide out of the non-return cylinder when passing through the runner groove when the gas meter is inclined and inverted.

Furthermore, the number of the non-return cylinders is two, the non-return cylinders are symmetrically arranged in the radial direction of the transition gear, the symmetrical non-return cylinders can balance the balance weight of the transition gear, and the transition gear is prevented from being deformed or swayed due to uneven stress.

Furthermore, the check pin is a round shaft pin made of 304 stainless steel, so that the service life and the stability of the check device of the gas meter are ensured.

Further, the non-return cylinder and the transition gear are integrated.

Compared with the prior art, the invention has the following beneficial effects:

(1) according to the invention, the non-return cylinder is arranged in the radial direction of the transition gear, the non-return pin is arranged in the non-return cylinder in a sliding manner, the runner groove is formed in the top of the bracket, and when the transition gear rotates reversely, the non-return pin can be limited by the limiting surface of the runner groove to slide, so that the effect of preventing the transition gear from rotating reversely is achieved, the transmission wheel matched with the transition gear in the membrane type gas meter cannot rotate reversely, the counter cannot count normally, the phenomenon of stealing gas by using a reverse connection pipeline is prevented, and the benefit of a gas company is ensured.

(2) The diaphragm type gas meter is additionally provided with the check pin part, the top of the support is provided with the runner groove, and the transition gear is provided with the check cylinder.

(3) According to the invention, the non-return pin can be ensured to smoothly slide out of the non-return cylinder through the compression spring, and even if the gas meter is inclined and inverted, the non-return pin can still slide out of the non-return cylinder when passing through the runway groove under the action of the recovery deformation of the compression spring, so that the effect of preventing the transition gear from reversely rotating is achieved.

Drawings

Fig. 1 is a schematic top view of a rotary gas meter in the prior art;

in fig. 1: 01-machine core, 02-side cover, 03-bracket, 04-transition gear, 05-driving wheel, 06-crank gear, 07-air outlet pipe, 08-rocker, 09-connecting rod and 010-valve cover;

FIG. 2 is a schematic structural diagram of prior art patent document CN 205808488U;

in fig. 2: 1-a bracket, 2-a driving wheel, 3-a backstop, 22 openings and 30-a tip;

FIG. 3 is a schematic structural diagram of the driving wheel in FIG. 2;

FIG. 4 is a schematic structural view of the backstop member of FIG. 2;

FIG. 5 is an exploded view of the structure of the present invention;

FIG. 6 is a schematic view of the assembly of the carrier and transition gear of FIG. 5;

FIG. 7 is an exploded view of FIG. 6;

FIG. 8 is a schematic view of the bracket of FIG. 5 engaged with a backstop pin;

FIG. 9 is a schematic view of the present invention with the transition gear rotating in the forward direction;

FIG. 10 is a schematic view showing a movement trace of the check pin of FIG. 9;

FIG. 11 is a schematic view of the present invention with the transition gear rotating in the reverse direction;

FIG. 12 is a schematic view showing a movement trace of the check pin of FIG. 11;

FIG. 13 is a schematic view showing the structure of a check pin, a check cylinder, and a spring according to the second embodiment;

in FIGS. 3-13: 100-bracket, 110-raceway groove, 200-transition gear, 210-backstop cylinder, 300-backstop pin and 400-compression spring.

Detailed Description

The following detailed description of the present invention is provided in conjunction with the accompanying drawings, but it should be understood that the scope of the present invention is not limited to the specific embodiments.

Example one

As shown in fig. 5 to 12, the diaphragm gas meter with a reverse stopping device includes a support 100, a transition gear 200, a reverse stopping cylinder (210) and a reverse stopping pin 300, the support 100 is fixedly connected to a housing of the diaphragm gas meter, the transition gear 200 is driven by a crank gear of the diaphragm gas meter to rotate and is matched with a transmission wheel, the transition gear 200 is rotatably installed on the support 100, two reverse stopping cylinders 210 with downward openings are symmetrically arranged on the transition gear 200 in the axial direction, the reverse stopping cylinders 210 and the transition gear 200 are integrated into a whole, the reverse stopping pin 300 is slidably installed in the reverse stopping cylinders 210, the reverse stopping pin 300 is a round shaft pin made of 304 stainless steel, the reverse stopping pin 300 can slide downwards along the reverse stopping cylinders 210 under the action of gravity, a runway groove 110 is arranged on a motion track of the reverse stopping pin 300, the runway groove 110 is provided with an arc surface and a limiting surface, the arc surface is an arc surface smoothly transited from the bottom surface of the runway groove 110 to the top surface of the support 100, the limiting surface is perpendicular to the bottom surface of the runway groove 110, in the forward rotation direction of the transition gear, the backstop pin can slide out of the runway groove; in the reverse rotation direction of the transition gear, the backstop pin is limited by the runway groove.

When the diaphragm gas meter works, the transition gear 200 is driven by the crank gear to rotate, the non-return pin 300 is under the action of gravity, the lower end part of the non-return pin falls out of the non-return cylinder 210, the non-return cylinder 210 slides on the top surface of the support 100 along the circumferential direction of the wheel shaft of the transition gear 200 along with the rotation of the transition gear 200, when the diaphragm gas meter is ventilated in the forward direction, the transition gear 200 rotates in the forward direction, when the diaphragm gas meter slides to the runway groove 110, the non-return pin 300 falls out of the lower end part of the non-return cylinder 210, and the non-return pin 300 slides smoothly from the arc surface to the top surface of the support 100 along with the sliding motion (see fig. 9 and 10); when the diaphragm gas meter is ventilated reversely and the transition gear 200 rotates reversely, when the check pin 300 slides to the runway groove 110, the lower section of the check pin 300 falling out of the check cylinder 210 is blocked by the limiting surface (see fig. 11 and 12), so that the check pin 300 cannot slide continuously, the transition gear 200 cannot rotate continuously, and the reverse rotation prevention function is realized.

Example two

Referring to fig. 5-13, the present embodiment is improved and optimized based on the first embodiment.

The diaphragm gas meter with the check device further comprises a compression spring 400, and the compression spring 400 is installed between the top of the check pin 300 and the bottom of the check cylinder 210.

As such, when backstop pin 300 passes through raceway groove 110, backstop pin 300 can be more smoothly slid out from backstop cylinder 210; when the gas meter is inclined or inverted, the check pin 300 can still slide out of the check cylinder 210 under the action of the restoring deformation of the compression spring 400, so that the function of preventing the reverse rotation of the transition gear 200 is achieved.

Further, the use effect of the present invention can be effectively improved.

The above disclosure is only for the specific embodiment of the present invention, but the embodiment of the present invention is not limited thereto, and any variations that can be made by those skilled in the art should fall within the scope of the present invention.