阅读说明：本技术 复合燃气表防逆流装置及燃气表 (Composite gas meter countercurrent-preventing device and gas meter ) 是由 袁林栋 朱伟泳 庄健 杨少亮 叶骁 王法良 阮明 方睿 于 2019-11-14 设计创作，主要内容包括：本发明涉及一种复合燃气表防逆流装置,包括防逆流装置底座、防逆流装置上盖、密封件、限位结构；防逆流装置底座上设有一通气口,该通气口侧旁与防逆流装置上盖铰接；防逆流装置上盖下落时搁置在通气口周围的环状的密封面上,密封面的周围紧贴防逆流装置上盖的侧边设有一环状的密封件,环状的密封件上表面高于密封面的上表面；限位结构设于防逆流装置底座的底部,用于限位设置在燃气表出口管中；防逆流装置上盖上表面设有一凹槽结构。本发明结构设计优化,底座具备限位防错功能；防逆流装置上盖底部设有凹槽结构,使其在遇到逆向流量时,受力更集中,密封效果更好。(The invention relates to a countercurrent prevention device for a composite gas meter, which comprises a countercurrent prevention device base, an countercurrent prevention device upper cover, a sealing element and a limiting structure, wherein the countercurrent prevention device base is provided with a sealing element; the base of the anti-reflux device is provided with an air vent, and the side of the air vent is hinged with the upper cover of the anti-reflux device; the upper cover of the anti-reflux device is placed on the annular sealing surface around the vent when falling, an annular sealing element is arranged on the side edge of the sealing surface, which is tightly attached to the upper cover of the anti-reflux device, and the upper surface of the annular sealing element is higher than that of the sealing surface; the limiting structure is arranged at the bottom of the base of the countercurrent prevention device and is used for limiting and arranging in an outlet pipe of the gas meter; the upper surface of the upper cover of the anti-reflux device is provided with a groove structure. The invention has optimized structural design, and the base has the functions of limiting and preventing errors; the bottom of the upper cover of the anti-reflux device is provided with a groove structure, so that the anti-reflux device is more concentrated in stress and better in sealing effect when encountering reverse flow.)

1. The utility model provides a compound gas table prevents device against current which characterized in that:

comprises an anti-reflux device base (1), an anti-reflux device upper cover (2), a sealing element (4) and a limiting structure (5);

the base (1) of the anti-reflux device is provided with an air vent, and the side of the air vent is hinged with the upper cover (2) of the anti-reflux device;

the upper cover (2) of the backflow prevention device is placed on an annular sealing surface (3) around the vent when falling, an annular sealing element (4) is arranged on the periphery of the sealing surface and clings to the side edge of the upper cover (2) of the backflow prevention device, and the upper surface of the annular sealing element (4) is higher than the upper surface of the sealing surface (3);

the limiting structure (5) is arranged at the bottom of the countercurrent prevention device base (1) and is used for limiting and arranging in an outlet pipe (6) of the gas meter;

the upper surface of the upper cover (2) of the anti-reflux device is provided with a groove structure.

2. The composite gas meter backflow prevention device according to claim 1, characterized in that: the upper cover (2) of the backflow prevention device is rectangular, and the vent is also rectangular; the side surface of the base (1) of the anti-reflux device is in a parallelogram shape and is used for preventing mistake during installation.

3. The composite gas meter backflow prevention device according to claim 1, characterized in that: the sealing element (4) is made of rubber.

4. The composite gas meter backflow prevention device according to claim 1, characterized in that: the upper cover (2) of the backflow prevention device is made of plastic.

5. A compound gas meter is characterized in that: the composite gas meter backflow prevention device of any one of claims 1 to 4 is adopted.

6. The composite gas meter according to claim 5, characterized in that: the composite gas meter is provided with a gas inlet (9) and a gas outlet (10), the gas outlet (10) is positioned at the tail end of a gas outlet pipe (6), and the front end of the gas inlet pipe (6) is provided with a valve cover (11).

7. The composite gas meter according to claim 5, characterized in that: the backflow prevention device (12) is fixedly arranged in the middle of the outlet pipe (6) through the limiting structure (5).

8. The composite gas meter according to claim 7, characterized in that: the backflow prevention device (12) is parallel to the plane of the inlet of the outlet pipe.

Technical Field

The invention relates to a gas meter, in particular to a composite gas meter countercurrent prevention device and a gas meter, and belongs to the technical field of gas meters.

Background

At present, part of gas meters in the market are provided with anti-reflux devices, and the anti-reflux devices mainly have two sealing structure forms, namely a plane hard sealing anti-reflux device; and the other type of backflow prevention device adopts a sealing piece for sealing.

Plane hard seal structure: as shown in fig. 1, the structure is greatly affected by the flatness processing quality of the sealing surface; the hard sealing structure can meet the standard leakage requirement, but certain leakage exists certainly, and the leakage amount is different due to the flatness processing precision of the sealing surface.

Sealing by a sealing element: as shown in FIG. 2, the structure is relatively complex, but the sealing effect is good, and under the standard test condition, no leakage can be realized, but at Q_max＝6m³And under the flow, the pressure loss of the flow channel can exceed a standard value, and the full-model gas meter product cannot be covered. When the gas meter works normally, the sealing element 8 (made of rubber) of the anti-reflux device is blown up by airflow and is ventilated normally; when the gas meter has reverse flow, the sealing piece 8 of the anti-reflux device falls down and is tightly attached to the support 7 of the anti-reflux device, so that the anti-reflux effect is realized. The structure is shown in fig. 2.

Therefore, the conventional gas meter backflow prevention device has poor backflow prevention effect and reliability or overlarge pressure loss, and cannot cover gas meter products with full-series flow.

Disclosure of Invention

The purpose of the invention is: the utility model provides a compound gas table anti-reflux device and gas table, solves the anti-reflux device or anti-reflux effect and the not good enough of reliability of current gas table simultaneously, or loss of pressure is too big, can not cover the gas table product of full series of flow's problem.

The invention adopts the following technical scheme:

a composite gas meter countercurrent prevention device comprises an countercurrent prevention device base 1, an countercurrent prevention device upper cover 2, a sealing element 4 and a limiting structure 5; the base 1 of the anti-reflux device is provided with an air vent, and the side of the air vent is hinged with the upper cover 2 of the anti-reflux device; the upper cover 2 of the backflow prevention device is placed on an annular sealing surface 3 around the vent when falling, an annular sealing element 4 is arranged on the periphery of the sealing surface and clings to the side edge of the upper cover 2 of the backflow prevention device, and the upper surface of the annular sealing element 4 is higher than the upper surface of the sealing surface 3; the limiting structure 5 is arranged at the bottom of the countercurrent prevention device base 1 and is used for limiting and arranging in an outlet pipe 6 of the gas meter; the upper surface of the upper cover 2 of the anti-reflux device is provided with a groove structure.

Preferably, the upper cover 2 of the backflow prevention device is rectangular, and the vent is also rectangular; the side surface of the base 1 of the anti-reflux device is in a parallelogram shape and is used for preventing mistake during installation.

Preferably, the sealing member 4 is made of rubber.

Preferably, the upper cover 2 of the backflow prevention device is made of plastic.

A composite gas meter adopts any one of the above anti-reflux devices.

Preferably, the composite gas meter is provided with a gas inlet 9 and a gas outlet 10, the gas outlet 10 is positioned at the tail end of the gas outlet pipe 6, and the front end of the gas inlet pipe 6 is provided with a valve cover 11.

Preferably, the backflow prevention device 12 is fixedly arranged in the middle of the outlet pipe 6 through the limiting structure 5.

Further, the backflow prevention device 12 is parallel to the plane of the inlet of the outlet pipe.

The invention has the beneficial effects that:

1) the diaphragm gas meter has a backflow prevention function;

2) the composite sealing structure is adopted, the sealing structure is multipurpose at low cost, and the product market adaptability is stronger;

3) the structural design is optimized, and the base has the functions of limiting and preventing errors;

4) the bottom of the upper cover of the anti-reflux device is provided with a groove structure, so that the anti-reflux device is more concentrated in stress and better in sealing effect when encountering reverse flow;

5) by adopting the sealing design of the sealing ring-shaped sealing piece arranged around the sealing surface, the good sealing effect is realized, and the problems that the gas meter products with the full-series flow cannot be covered due to overlarge pressure loss are also solved.

Drawings

FIG. 1 is a front view of a prior art hard seal backflow prevention device in the form of a planar hard seal structure.

Fig. 2 is a cross-sectional view of a prior art backflow prevention device in the form of a seal.

Fig. 3 is a perspective view of the backflow prevention device for a composite gas meter of the present invention.

Fig. 4 is a sectional view of the composite gas meter reverse flow prevention device of the present invention installed in the outlet pipe.

Fig. 5 is a sectional view of a composite gas meter of the related art.

Fig. 6 is a sectional view of the composite gas meter of the present invention.

In the figure, 1, a base of the anti-reflux device, 2, an upper cover of the anti-reflux device, 3, a sealing surface, 4, a sealing element, 5, the anti-reflux device, 6, an outlet pipe, 7, a bracket of the anti-reflux device, 8, a sealing element of the anti-reflux device, 9, an air inlet, 10, an air outlet and 11, a valve cover are arranged.

Detailed Description

The invention is further described with reference to the following figures and specific examples.

Comparative example:

at present, most of common gas meters in the market do not have a backflow prevention function, and as shown in fig. 5, when the gas meter has a reverse flow due to an abnormal reason, gas enters from a gas outlet 10, and rushes off a valve cover 11 through an outlet pipe 6 to flow out from a gas inlet 9 of the gas meter. The structure is shown in fig. 5. This has an adverse effect on the gas meter.

The embodiment of the invention comprises the following steps:

referring to fig. 3, 4 and 6, the countercurrent prevention device for the composite gas meter comprises an countercurrent prevention device base 1, an countercurrent prevention device upper cover 2, a sealing element 4 and a limiting structure 5; the base 1 of the anti-reflux device is provided with an air vent, and the side of the air vent is hinged with the upper cover 2 of the anti-reflux device; the upper cover 2 of the backflow prevention device is placed on an annular sealing surface 3 around the vent when falling, an annular sealing element 4 is arranged on the periphery of the sealing surface and clings to the side edge of the upper cover 2 of the backflow prevention device, and the upper surface of the annular sealing element 4 is higher than the upper surface of the sealing surface 3; the limiting structure 5 is arranged at the bottom of the countercurrent prevention device base 1 and is used for limiting and arranging in an outlet pipe 6 of the gas meter; the upper surface of the upper cover 2 of the anti-reflux device is provided with a groove structure.

In this embodiment, referring to fig. 3, the upper cover 2 of the backflow prevention device has a rectangular shape, and the vent has a rectangular shape; the side surface of the base 1 of the anti-reflux device is in a parallelogram shape and is used for preventing mistake during installation.

In this embodiment, the sealing member 4 is made of rubber.

In this embodiment, the upper cover 2 of the backflow prevention device is made of plastic.

A composite gas meter is provided, and the backflow prevention device for the composite gas meter is shown in figure 6.

Continuing to refer to fig. 6, the composite gas meter is provided with a gas inlet 9 and a gas outlet 10, the gas outlet 10 is positioned at the tail end of the gas outlet pipe 6, and the front end of the gas inlet pipe 6 is provided with a valve cover 11.

With continued reference to fig. 6, the backflow prevention device 5 is fixedly arranged in the middle of the outlet pipe 6 through the limiting structure 5.

Referring to fig. 4 and 6, the backflow prevention device 5 is parallel to the plane of the inlet of the outlet pipe.

The specific principle is illustrated as follows: referring to fig. 4 and 6, a backflow prevention device 6 is installed in an outlet pipe 5 of a gas meter, so that a general gas meter has a backflow prevention function. The seal between the outlet pipe 5 and the backflow prevention device 6 is sealed by a sealant between the original outlet pipe 5 and the valve seat. Referring to fig. 3, the base 1 of the backflow prevention device includes a position limiting structure 5, so as to ensure the position of the sealing surface of the backflow prevention device 6, and enable the gap between the backflow prevention device 6 and the outlet pipe 5 to be effectively filled with the sealant.

The sealing of the backflow prevention device 5 is realized by the sealing surface 3 of the backflow prevention device base 1 and the backflow prevention device upper cover 2, and meanwhile, the sealing can also be realized by the backflow prevention device upper cover 2 and the sealing element 4. The back of the upper cover 2 of the anti-reflux device adopts a groove structure, and the design can play a role in converging, so that the stress is more concentrated and the sealing effect is better when the anti-reflux device meets the reverse flow; the design mode of the composite sealing structure of the sealing surface 3 and the sealing element 4 of the base of the anti-reflux device is to meet the requirements of different customers at different costs, and if the national standard requirements are met, the sealing surface 3 of the base 1 of the anti-reflux device and the upper cover 2 of the anti-reflux device can be sealed in a hard mode; if a complete seal is required, the sealing structure of the upper cover 2 and the sealing member 4 of the backflow preventing device can be adopted.

Referring to fig. 6, when the gas meter is inverted due to an abnormal reason, gas flows into the outlet pipe 6 from the gas outlet 10, and at this time, the backflow prevention device 5 is installed in the outlet pipe 6 to intercept the gas, so that the backflow prevention effect is realized. The invention enables the gas meter to have the function of anti-reflux; the gas meter can not be normally used when being inverted; prevent the malicious upside-down installation of user and steal the gas action. Meanwhile, the problems that the counter-flow prevention device of the existing gas meter has poor counter-flow prevention effect and reliability or too large pressure loss and cannot cover gas meter products with full-series flow are solved.

While the preferred embodiments of the present invention have been described, those skilled in the art will appreciate that various changes and modifications can be made therein without departing from the spirit and scope of the invention as defined by the appended claims.