Plug-in gas leakage prevention device for gas flow meter

Abstract

The invention discloses a plug-in gas flow meter gas leakage prevention device which comprises a sleeve, the wall thickness of the sleeve is 5 mm, the length of the sleeve is 10 cm, an inner sealing ring is arranged in the middle of the sleeve, outer sealing rings are arranged on the portions, on the two sides of the inner sealing ring, of the outer wall of the sleeve respectively, and the two ends of the sleeve are communicated with a gas pipeline ball valve and a flow meter respectively. The device is simple in structure and safe and convenient to use, gas in a gas pipeline cannot overflow in the plugging process of the plug-in flowmeter after installation, the safety of personnel is ensured, and meanwhile, the labor intensity of maintenance personnel is reduced.

Description

Technical Field

[0001] The invention relates to an anti-leakage device for an insertion type gas flow meter. Background Art

[0002] At present, gas flow meters (large pipe diameters) mostly use online insertable flow meters according to the needs of the site. The earlier installed insertable flow meters are designed to be pulled out for maintenance in the state of gas outage. In the process of pulling out the flow meter throttling device from the protective tube, due to the lack of anti-leakage seal, the gas in the pipeline will overflow along the protective tube, posing a safety hazard. According to on-site statistical surveys, most of the gas flow meters used on site need to be pulled out for maintenance when they have abnormalities. This is because the production site does not have the conditions for shutdown maintenance, resulting in the time on the flow meter being inaccurate and unable to provide accurate data for production. Therefore, it is necessary to modify the plug-in structure of the insertable flow meter so that it can be repaired without stopping the gas, while ensuring the safety of the maintenance party.

[0003] Literature search: Application (patent) number: CN95206981.4; Publication / announcement number: CN2228595; Applicant (patent holder): Chen Mingshui "New type of anti-leakage device for pipeline joints" Abstract: The utility model relates to an anti-leakage device in pipeline joints, especially suitable for anti-leakage devices for gas and water pipeline joints. It includes a rubber ring and a forced ring, wherein the inner edge of the rubber ring has a concave ring, and the outer edges on both sides have convergent slopes. A retractable forced ring with an arc-shaped cross-section that can overlap inside and outside at the disconnection intersection is provided in the inner edge concave ring of the rubber ring. Thereby improving the anti-leakage effect of the pipeline joint. Summary of the invention

[0004] The purpose of the present invention is to provide an insertion type gas flow meter anti-leakage device, which has a simple structure, is safe and convenient to use, and after installation, ensures that during the insertion and removal of the insertion flow meter, gas in the gas pipeline will not overflow, thereby ensuring the safety of personnel and reducing the labor intensity of maintenance personnel.

[0005] The technical solution adopted by the present invention is an anti-leakage device for an inserted gas flowmeter, including a sleeve with a wall thickness of 5 mm and a length of 10 cm. An inner sealing ring is arranged in the middle of the sleeve, and an outer sealing ring is arranged on the outer wall of the sleeve on both sides of the inner sealing ring. The two ends of the sleeve are respectively connected to the gas pipeline ball valve and the flowmeter.

[0006] 1. During the design and installation process of the insertion flowmeter, a manual ball valve (DN32-50) will be installed on the pipeline. After the ball valve is installed, open the ball valve, and the flowmeter throttling piece passes through the inside of the ball valve and is inserted into the gas pipeline. After being inserted into place, the throttling piece flange and the ball valve flange are connected and fixed. There is a 5mm gap between the throttling piece and the inner wall of the ball valve. During the plugging and unplugging process of the flowmeter, the gas leaks out from this gap. A sleeve device can be designed and installed in this gap to prevent gas from overflowing. 2. The designed anti-leakage device cannot hinder the insertion depth of the flowmeter throttling piece during the plugging and unplugging process of the flowmeter, affecting the accuracy of the measurement. It cannot fall off during the unplugging process of the flowmeter, causing gas leakage.

[0007] The gas leakage prevention device of the present invention: 1. According to the size of the flow meter throttling rod, select a suitable sleeve as the main body of the leakage prevention device. The thickness of the sleeve is about 5 mm, and the length of the sleeve is selected to be about 10 cm, so that one end of the sleeve is inserted into the upper end flange tube of the fixed ball valve to a certain depth, and the other end is inserted into the flange tube of the throttling rod. 2. Two shallow grooves are made on the outer wall of the leakage prevention device sleeve at positions unequally spaced from the center line. The shallow groove making process ensures that the inner wall of the sleeve is not damaged and no penetration occurs. The depth of the shallow groove is sufficient to fix the outer sealing ring (the outer sealing ring is consistent with the size of the leakage prevention sleeve), and at the same time ensure that the sleeve does not form a large resistance when inserted into the inner wall of the ball valve flange pipeline, damaging the sealing ring, and in the process of pulling out the flow meter throttling rod, the leakage prevention device sleeve will not be brought out and lose the sealing effect. 3. Make a shallow groove at the upper end of the inner wall of the anti-leakage device casing (parallel to the position of the shallow groove on the outer wall). The process of making the shallow groove ensures that the outer wall of the casing is not damaged and no penetration occurs. The depth of the shallow groove is sufficient to fix the inner sealing ring (the inner sealing ring is consistent with the size of the anti-leakage casing). At the same time, it ensures that during the insertion of the flow meter throttling rod into the pipeline, no large resistance is formed, and the sealing ring is brought into the pipeline, losing the sealing effect. 4. The material of the anti-leakage device casing is selected according to the temperature of the medium (the central temperature of the gas medium is up to 150°C, and the temperature of heat conduction is about 40°C) and the outdoor ambient temperature (about -30°C below zero). The temperature resistance range of the casing material should be within the range of -30°C-+50°C, and the flexibility of the material should not change for a long time under the above extreme temperatures.

[0008] The present invention: 1. It has a simple structure and is safe and convenient to use. After installation, it ensures that the gas in the gas pipeline will not overflow during the plug-in and unplugging process of the plug-in flow meter, thereby ensuring the safety of personnel and reducing the labor intensity of maintenance personnel. 2. The gas leakage prevention device is easy to disassemble, the installation position can be adjusted, and it is highly practical. 3. The new materials required for the gas leakage prevention device are relatively common, easy to manufacture and process, and highly operable. 4. It is highly practical and has been used in the Bagang EMS+ energy data information engineering project with significant results. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention. Implementation

[0010] An insertion type gas flow meter anti-leakage device, such as Figure 1 As shown, it includes a sleeve 1, the wall thickness of the sleeve 1 is 5mm, the length of the sleeve 1 is 10cm, an inner sealing ring 3 is arranged in the middle of the sleeve 1, and an outer sealing ring 2 is arranged on the outer wall of the sleeve on both sides of the inner sealing ring. The two ends of the sleeve are respectively connected to the gas pipeline ball valve and the flow meter.

Claims

1. An insertion type gas flow meter anti-leakage device, comprising a sleeve, characterized in that: The wall thickness of the casing is 5mm and the length of the casing is 10cm. An inner sealing ring is arranged in the middle of the casing, and an outer sealing ring is arranged on the outer wall of the casing on both sides of the inner sealing ring. The two ends of the casing are respectively connected to the gas pipeline ball valve and the flow meter.

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