High-temperature-resistant abrasion-proof positive-pressure expansion joint

Abstract

The invention discloses a high-temperature-resistant abrasion-proof positive-pressure expansion joint, which comprises an upper bushing which is connected with a flange in a welding way, a lower bushing which is arranged on the flange and a metal corrugated pipe which is arranged at the outer sides of the upper and the lower bushings, wherein a heat-preserving material is respectively arranged between the upper bushing and the metal corrugated pipe and between the lower bushing and the metal corrugated pipe, a plurality of hooks are arranged on the outer wall of the upper bushing and the lower bushing, the heat-preserving materials are wrapped by a wire mesh and is fixed on the upper and the lower bushings through the hooks, the periphery of the lower bushing is provided with a limiting clamp plate, a radial expansion gap is reserved between the limiting clamp plate and the lower bushing, and a plurality of grasping nails are welded on the inner walls of the upper bushing and the lower bushing, and an abrasion-proof material is respectively arranged on the inner wall of the upper bushing and the lower bushing, so the leakage, ripping and abrasion of the expansion joint can be prevented.

Description

technical field [0001] The invention relates to an expansion joint, in particular to a high-temperature-resistant and wear-resistant positive pressure expansion joint. Background technique [0002] In the boiler, smelting and chemical industries, some flue ducts work in high temperature and positive pressure environments, and have the characteristics of high dust concentration, high speed and strong wear in the air flow. Due to the expansion difference, expansion joints are usually installed in these parts , to absorb the expansion. Due to the unreasonable structural design of the currently used expansion joints, there are mainly the following problems: 1. The radial expansion cannot be absorbed during operation and it is pulled apart; 2. The inner casing cannot be sealed, resulting in high-temperature flue gas leakage and burning of the bellows; 3. After the cold state and the hot state, the insulation material cannot recover and the corrugated pipe is burned out; 4. The i...

AI Technical Summary

Problems solved by technology

Due to the unreasonable structural design of the currently used expansion joints, there are mainly the following problems: 1. The radial expansion cannot be absorbed during operation and it is pulled apart; 2. The inner casing cannot be sealed, resulting in high-temperature flue gas leakage and burning of the bellows; 3. After the cold state and the hot state, the insulation material cannot recover and the bellows burns out; 4. The inner sleeve is worn without anti-wear material

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