Steel-plastic conversion joint for heavy anti-corrosion fuel gas and manufacturing method thereof

Abstract

The invention relates to a steel-plastic conversion joint for heavy anti-corrosion fuel gas. The steel-plastic conversion joint is characterized in that a pipe body front insertion section is insertedinto a large-diameter pipe section, and the outer wall of the pipe body front insertion section is in interference fit with the inner wall of the large-diameter pipe section; a right end surface of the large-diameter pipe section abuts against a left end surface of a pipe body middle limiting section; multiple annular barb structures are arranged on the outer wall of a front section and a middlesection of the pipe body front insert section at equal intervals; a first annular sealing groove is formed in the outer wall of a tail section of the pipe body front insertion section, and a first sealing ring is installed in the first annular sealing groove; a second sealing ring is arranged between an end face of a small-diameter pipe section of a polyethylene plastic pipe and an end face of thepipe body front insertion section of a metal lining part, and a second sealing groove used for containing the second sealing ring is formed in the end face of the pipe body front insertion section; and the small-diameter pipe section is sleeved with a metal outer sleeve pipe. The steel-plastic conversion joint has the beneficial effects of being more excellent in anti-corrosion effect and capableof perfectly realizing the same service life as a polyethylene pipeline.

Description

technical field [0001] The invention relates to the technical field of pipeline connectors, in particular to a steel-plastic conversion joint for heavy-duty anti-corrosion gas and a manufacturing method thereof. Background technique [0002] At present, in the field of gas and other fluid transportation, metal pipes such as steel pipes and polyethylene (PE) plastic pipes are usually used. Among them, metal pipes are often used for medium and high pressure fluid transportation, while plastic pipes are generally used for low-pressure fluid transportation. In addition, for safety reasons, Relevant national engineering regulations stipulate that plastic pipes are not allowed to directly enter the end of the pipe—the user's room. Therefore, polyethylene (PE) steel-plastic conversion joints are usually required when transitioning from high-pressure pipes to low-pressure pipes, and when plastic pipes enter the home from garden pipes. The anti-corrosion performance of polyethylene ...

AI Technical Summary

Problems solved by technology

[0003] Ordinary steel-plastic conversion usually sprays anti-corrosion materials such as epoxy resin or polyethylene on the outside of the steel pipe end. During storage, transportation, installation, and on-site use, due to factors such as bumps and scratches, the anti-corrosion layer is prone to fall off. Anti-corrosion effect and service life are not ideal

At present, other multi-layer anti-corrosion measures are also used in engineering, and there are often defects such as complex procedures, high construction requirements, and the inability of anti-corrosion materials to be reliably bonded to steel pipes and polyethylene (PE) pipes at the same time. It is difficult to achieve perfect unity in terms of anti-corrosion effect and economy

[0004] The invention patent with the application number 201210090942.4 discloses a reinforced anti-corrosion polyethylene steel-plastic conversion joint and its processing technology, which can solve the above technical problems, but there are also shortcomings: 1. The inner circle size of the metal lining part and the polyethylene plastic pipe fitting are inconsistent, It cannot be guaranteed that the flow rate will not be affected by the change of the diameter during the gas delivery process

2. There are 5-8 undercut structures and 2 to 3 annular grooves for installing O-rings on the outside of the metal pipe fittings; the undercut structures and annular grooves are located at the joints of polyethylene plastic pipe fittings and metal pipe fittings The position; the annular groove is located on both sides or both sides and the middle position of the socket, and the sealing effect is poor

3. It is necessary to evenly coat a layer of DH solvent-free epoxy coating with a thickness of 0.5±0.1mm on the outside of the metal pipe fittings, which will affect the construction of the hot melt adhesive winding layer

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