Anti-reflux device of diaphragm gas meter

Abstract

The utility model discloses a diaphragm gas meter anti-reflux device in the technical field of diaphragm gas meters, which comprises a diaphragm gas meter and a gas pipeline, a gas inlet joint is mounted on one side of the top of the diaphragm gas meter, a flange A is mounted at the top end of the gas inlet joint, a gas outlet joint is mounted on the other side of the top of the diaphragm gas meter, and a flange B is mounted at the top end of the gas outlet joint. The structure is reasonable, through the arrangement of the plug, the inner pipe and the U-shaped installation ring, the plug in the anti-backflow pipeline is matched with the movable head to be arranged in the limiting column in a sliding mode, the spring is matched, and the counter-acting force of the spring is utilized, so that the spring keeps sealing the diaphragm in the anti-backflow pipeline to the plug; the plug is pushed by the gas pressure generated by the gas to be separated from the diaphragm, so that the gas is normally conveyed into the diaphragm type gas meter, and when the gas reversely flows, the spring has no pressure and pushes the plug to plug the diaphragm, so that the gas cannot circulate, and the reverse flow prevention effect is realized.

Description

Technical Field

[0001] The utility model relates to the technical field of diaphragm gas meters, in particular to a backflow prevention device for diaphragm gas meters. Background Art

[0002] Anti-backflow of diaphragm gas meters is a very important function of the product, especially in preventing gas theft of gas meters. Diaphragm gas meters are volumetric flow meters driven by gas pressure difference. They have requirements for gas flow direction. Only when the inlet and outlet joints are connected in the normal flow direction can the gas entering the gas meter be measured. Therefore, the standard requires that there must be obvious marking requirements on the meter. At present, diaphragm gas meters are prone to the risk of gas backflow during use. When the gas flows back in the opposite direction, it is easy to cause gas leakage or other safety problems, thereby reducing the safety of the use of diaphragm gas meters. At the same time, when the diaphragm gas meter is connected to the gas pipeline or other pipelines, it is easy for gaps to appear at the connection between the gas pipeline and the diaphragm gas meter, causing gas leakage. During the gas leakage process, it is also easy to cause gas backflow, thereby reducing the use effect of the diaphragm gas meter's anti-backflow device and directly affecting the safety of the diaphragm gas meter's anti-backflow device.

[0003] Therefore, it is necessary to develop a backflow prevention device for diaphragm gas meters. Utility Model Content

[0004] The utility model aims to provide a diaphragm gas meter anti-backflow device, which is provided with a plug, an inner tube and a U-shaped mounting ring, and the plug in the anti-backflow pipeline is matched with a movable head to be slidably arranged inside a limit column, and is matched with a spring, and the reaction force of the spring is utilized to make the spring keep the diaphragm in the anti-backflow pipeline sealed by the plug. When the gas enters the anti-backflow pipeline, the gas pressure generated by the gas pushes the plug to separate from the diaphragm, so that the gas can be normally transported to the diaphragm gas meter. When the gas reverses flow, the spring is pressureless and pushes the plug to seal the diaphragm, thereby achieving the goal of preventing the gas from flowing and realizing the anti-backflow effect, so as to solve the problem of the diaphragm gas meter being prone to gas backflow proposed in the above-mentioned background technology.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a diaphragm gas meter backflow prevention device, comprising a diaphragm gas meter and a gas pipeline, a gas inlet joint is installed on one side of the top of the diaphragm gas meter, a flange A is installed on the top of the gas inlet joint, a gas outlet joint is installed on the other side of the top of the diaphragm gas meter, and a flange B is installed on the bottom end of the gas pipeline;

[0006] An anti-backflow pipeline is installed between the gas pipeline and the opposite side of the gas inlet joint, and U-shaped mounting rings are installed on both sides of the outer walls of the flange B and the flange A.

[0007] Preferably, a switch valve is installed below the outer wall of the gas pipeline.

[0008] Preferably, a diaphragm is provided at the inner center position of the anti-backflow pipe, and a limiting column is installed at the inner center position of one side of the anti-backflow pipe.

[0009] Preferably, a movable head is installed at one end of the limiting column, and the outer wall of the movable head is slidably connected to the inside of the limiting column.

[0010] Preferably, a spring is provided at the center position of the inner wall of one side of the limiting column, a plug is provided at one end of the movable head, and flanges C are installed at both ends of the anti-backflow pipe.

[0011] Preferably, an inner tube is installed inside the flange C, the outer wall of the inner tube is slidably connected to the inner wall of the inner tube, and a sealing ring A is provided on the outer wall of the inner tube.

[0012] Preferably, a sealing ring B is provided on the inner wall of the U-shaped mounting ring, and mounting holes are provided on both sides of the surface of the U-shaped mounting ring.

[0013] Compared with the prior art, the beneficial effects of the utility model are:

[0014] By providing a plug, an inner tube and a U-shaped mounting ring, the plug in the anti-backflow pipe is slidably arranged in combination with a movable head inside the limit column, and is matched with a spring. The reaction force of the spring is utilized to enable the spring to maintain the diaphragm in the anti-backflow pipe sealed against the plug. When the gas enters the anti-backflow pipe, the gas pressure generated by the gas pushes the plug away from the diaphragm, so that the gas can be normally transported to the diaphragm gas meter. When the gas reverses flow, the spring is depressurized and pushes the plug to seal the diaphragm, thereby preventing the gas from flowing and achieving the anti-backflow effect.

[0015] By slidingly arranging two sets of inner tubes with sealing rings A in the gas pipeline and the gas inlet joint, and installing the anti-backflow pipe between the gas pipeline and the gas inlet joint, the inner tube is matched with the sealing ring A to seal the connection, and then the U-shaped mounting ring is matched with the sealing ring B for installation and sealing, the double sealing effect of inside and outside can be achieved, and the leakage prevention of the diaphragm gas meter is realized, and the backflow of gas in the pipeline caused by leakage due to gaps at the connection between the diaphragm gas meter and the gas pipeline is avoided as much as possible, which effectively improves the use effect of the anti-backflow device of the diaphragm gas meter and directly improves the safety of the diaphragm gas meter. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 The overall structural diagram provided by the utility model;

[0017] Figure 2 A schematic diagram of a local structure provided by the utility model;

[0018] Figure 3 The utility model provides Figure 2 A magnified view of the structure at A;

[0019] Figure 4 The utility model provides Figure 2 A magnified view of the structure at B in FIG.

[0020] Figure 5 This is a partial structural decomposition schematic diagram provided by the utility model.

[0021] In the figure: 1. diaphragm gas meter; 101. gas inlet joint; 102. flange A; 103. gas outlet joint; 2. gas pipeline; 201. flange B; 202. switch valve; 3. anti-backflow pipeline; 301. diaphragm; 302. limit column; 303. movable head; 304. spring; 305. plug; 306. flange C; 307. inner tube; 308. sealing ring A; 4. U-shaped mounting ring; 401. sealing ring B; 402. mounting hole. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0023] The utility model provides the following technical solutions: Diaphragm gas meter anti-backflow device, please refer to Figure 1-5 , comprising a diaphragm gas meter 1 and a gas pipeline 2, a gas inlet joint 101 is installed on one side of the top of the diaphragm gas meter 1, a flange A102 is installed on the top of the gas inlet joint 101, a gas outlet joint 103 is installed on the other side of the top of the diaphragm gas meter 1, a flange B201 is installed at the bottom end of the gas pipeline 2, and a switch valve 202 is installed at the lower part of the outer wall of the gas pipeline 2;

[0024] An anti-backflow pipeline 3 is installed between the gas pipeline 2 and the opposite side of the gas inlet joint 101, a diaphragm 301 is arranged at the inner center of the anti-backflow pipeline 3, a limiting column 302 is installed at the center of the inner wall of one side of the anti-backflow pipeline 3, a movable head 303 is installed at one end of the limiting column 302, the outer wall of the movable head 303 is slidably connected with the inside of the limiting column 302, a spring 304 is arranged at the center of the inner wall of one side of the limiting column 302, a plug 305 is arranged at one end of the movable head 303, the plug 305 in the anti-backflow pipeline 3 is slidably arranged in the inside of the limiting column 302 in combination with the movable head 303, and the spring 304 is matched to utilize the reverse action of the spring 304 to prevent the plug 305 from being slidably arranged in the inside of the limiting column 302. Use force to make the spring 304 keep the diaphragm 301 in the anti-backflow pipe 3 sealed with the plug 305. When the gas enters the anti-backflow pipe 3, the gas pressure generated by the gas pushes the plug 305 to separate from the diaphragm 301, so that the gas can be normally transported to the diaphragm gas meter 1. When the gas reverses, the spring 304 is pressureless and pushes the plug 305 to block the diaphragm 301, so that the gas cannot flow and the anti-backflow effect is achieved. Flanges C306 are installed at both ends of the anti-backflow pipe 3. An inner tube 307 is installed inside the flange C306. The outer wall of the inner tube 307 is slidably connected to the inner wall of the inner tube 307. A sealing ring A308 is arranged on the outer wall of the inner tube 307.

[0025] U-shaped mounting rings 4 are installed on both sides of the outer walls of flange B201 and flange A102, and sealing rings B401 are arranged on the inner walls of the U-shaped mounting rings 4. Mounting holes 402 are opened on both sides of the surface of the U-shaped mounting rings 4. The flange C306 below the anti-backflow pipe 3 is docked with the flange A102 on the diaphragm gas meter 1, and the flange C306 above the anti-backflow pipe 3 is docked with the flange B201 on the gas pipe 2. During the docking process, the inner pipe 307 is pre-installed between the flange A102 and the inside of the flange C306, and between the flange B201 and the inside of the flange C306, so as to achieve the connection between the flange A102 and the inside of the flange C306 and between the flange B201 and the flange The joint gaps between the inside of C306 are sealed. At the same time, during the installation of the inner tube 307, it is necessary to install the sealing ring A308 to improve its sealing performance. After the flange A102 is connected to the flange C306 and the flange B201 is connected to the flange C306, first two sets of sealing rings B401 are installed on the external joint gaps between the flange A102 and the flange C306 and the flange B201 and the flange C306, and then four sets of U-shaped mounting rings 4 are inserted into the outer walls of the flange A102 and the flange C306 and the flange B201 and the flange C306. Finally, the fixing bolts pass through the mounting holes 402 on the U-shaped mounting rings 4 and are locked to achieve installation, fixing and sealing.

[0026] Working principle: When using the utility model, the plug 305 in the anti-backflow pipe 3 is slidably arranged in the interior of the limit column 302 with the movable head 303, and is matched with the spring 304. The reaction force of the spring 304 is used to make the spring 304 keep the plug 305 sealing the diaphragm 301 in the anti-backflow pipe 3. When the gas enters the anti-backflow pipe 3, the gas pressure generated by the gas pushes the plug 305 away from the diaphragm 301, so that the gas can be normally transported to the membrane gas meter 1. When the gas reverses, the spring 304 will stop the plug 305 from the diaphragm 301. 04 No pressure, push the plug 305 to block the diaphragm 301, so that the gas cannot flow and the anti-backflow effect is achieved. The flange C306 below the anti-backflow pipe 3 is docked with the flange A102 on the diaphragm gas meter 1, and the flange C306 above the anti-backflow pipe 3 is docked with the flange B201 on the gas pipe 2. During the docking process, the inner tube 307 is pre-installed between the flange A102 and the inside of the flange C306, and between the flange B201 and the inside of the flange C306, so that the flange A102 and the flange C3 are aligned. 06 and the butt joint gap between flange B201 and flange C306 are blocked. At the same time, during the installation of inner tube 307, it is necessary to install sealing ring A308 to improve its sealing performance. After flange A102 and flange C306 and flange B201 and flange C306 are butt jointed, first install two sets of sealing rings B401 on the external butt joint gaps between flange A102 and flange C306 and flange B201 and flange C306, and then insert four sets of U-shaped mounting rings 4 into flange A102 and flange C306 and flange B201 and the outer wall of flange C306, and finally the fixing bolts penetrate the mounting hole 402 on the U-shaped mounting ring 4 and are locked to achieve installation, fixing and sealing. By taking double sealing effect on the internal and external butt joint gaps of the pipeline, the diaphragm gas meter is leak-proof, and the gas backflow in the pipeline caused by leakage due to gaps at the connection between the diaphragm gas meter and the gas pipeline is avoided as much as possible. The use effect of the anti-backflow device of the diaphragm gas meter is effectively improved, and the safety of the diaphragm gas meter is directly improved.

[0027] Although the present invention has been described above with reference to the embodiments, various modifications may be made thereto and parts thereof may be replaced with equivalents without departing from the scope of the present invention. In particular, as long as there is no structural conflict, the various features in the embodiments disclosed in the present invention may be used in combination with each other in any manner, and the fact that these combinations are not exhaustively described in this specification is only for the sake of omitting space and saving resources. Therefore, the present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A diaphragm gas meter backflow prevention device, comprising a diaphragm gas meter (1) and a gas pipeline (2), wherein a gas inlet joint (101) is installed on one side of the top of the diaphragm gas meter (1), a flange A (102) is installed on the top of the gas inlet joint (101), and a gas outlet joint (103) is installed on the other side of the top of the diaphragm gas meter (1), characterized in that: A flange B (201) is installed at the bottom end of the gas pipeline (2); An anti-backflow pipeline (3) is installed between the gas pipeline (2) and the opposite side of the gas inlet joint (101), and U-shaped mounting rings (4) are installed on both sides of the outer walls of the flange B (201) and the flange A (102).

2. The diaphragm gas meter backflow prevention device according to claim 1, characterized in that: A switch valve (202) is installed below the outer wall of the gas pipeline (2).

3. The diaphragm gas meter backflow prevention device according to claim 1, characterized in that: A diaphragm (301) is provided at the inner center position of the backflow prevention pipe (3), and a limiting column (302) is installed at the inner center position of one side of the backflow prevention pipe (3).

4. The diaphragm gas meter backflow prevention device according to claim 3, characterized in that: A movable head (303) is installed at one end of the limiting column (302), and the outer wall of the movable head (303) is slidably connected to the inside of the limiting column (302).

5. The diaphragm gas meter backflow prevention device according to claim 4, characterized in that: A spring (304) is provided at the center of the inner wall of one side of the limiting column (302), a plug (305) is provided at one end of the movable head (303), and flanges C (306) are installed at both ends of the backflow prevention pipe (3).

6. The diaphragm gas meter backflow prevention device according to claim 5, characterized in that: An inner tube (307) is installed inside the flange C (306), the outer wall of the inner tube (307) is slidably connected to the inner wall of the inner tube (307), and a sealing ring A (308) is provided on the outer wall of the inner tube (307).

7. The diaphragm gas meter backflow prevention device according to claim 1, characterized in that: The inner wall of the U-shaped mounting ring (4) is provided with a sealing ring B (401), and mounting holes (402) are provided on both sides of the surface of the U-shaped mounting ring (4).

Images