Anti-negative pressure lined PTFE material shrimp elbow

Abstract

The invention discloses a negative pressure-preventing polytetrafluoroethylene-lined creased elbow which comprises steel creased sections (1) and polytetrafluoroethylene-lined layers (2) and is characterized in that: the steel creased sections (1) are pipes with ladder-shaped cross sections; flanges (3) are arranged at pipe ports at two ends; the polytetrafluoroethylene-lined layers (2) are lined on inner walls of the steel creased sections (1); at least two steel creased sections (1) lined with the polytetrafluoroethylene-lined layers (2) are connected into an elbow; negative pressure rings (4) are fixed in the middle of inner surfaces of the polytetrafluoroethylene-lined layers (2); turned edges which are matched with the flanges (3) are arranged at the two ends of the polytetrafluoroethylene-lined layers (2); and exhaust holes are respectively arranged at two ends of the steel creased sections (1). The negative pressure-preventing polytetrafluoroethylene-lined creased elbow has the advantages of low use cost, simple structure, negative pressure resistance, high temperature resistance and long service life.

Description

technical field [0001] The invention belongs to the technical field of pipe fittings, and in particular relates to an elbow with anti-negative pressure, high temperature resistance and corrosion resistance. Background technique [0002] At present, elbows lined with PTFE are mostly used for pipe connections with harsh process conditions such as high temperature and strong medium corrosion. The processing method is that after the steel elbow is processed, it is molded and lined with PTFE material, and then the surface is painted with anti-corrosion paint. Due to high temperature, large negative pressure and strong medium corrosion during use, the adhesion between the steel elbow and the lining PTFE material is poor, and there is air between the two, which will expand when encountering high temperature gas. The fluorine lining layer is easy to bubble and break, which is one of the reasons why the PTFE lining layer is easy to tear. The tearing of the PTFE lining layer will mak...

AI Technical Summary

Problems solved by technology

Due to high temperature, large negative pressure and strong medium corrosion during use, the adhesion between the steel elbow and the lining PTFE material is poor, and there is air between the two, which will expand when encountering high temperature gas. The fluorine lining layer is easy to bubble and break, which is one of the reasons why the PTFE lining layer is easy to tear. The tearing of the PTFE lining layer will make the material contact with the steel parts and corrode the steel parts, resulting in material leakage, making the PTFE material Lined elbows cannot be used

Therefore, the existing elbows lined with PTFE materials have low service life, high maintenance costs, and frequent maintenance and replacement, resulting in low equipment start-up rates and huge economic losses to enterprises.

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