Water-cooling expansion joint suitable for high-temperature pipeline connection

Abstract

The invention relates to a water-cooling expansion joint suitable for high-temperature pipeline connection. The water-cooling expansion joint comprises a first flange lining, an I-type flange, a double-layer corrugated pipe, an II-type flange, a second flange lining and a fluid cooling flow guiding annular plate; the double-layer corrugated pipe is of a hollow structure and is connected with the I-type flange and the II-type flange through the first flange lining and the second flange lining, and thus an interlayer of the double-layer corrugated pipe communicates with cooling fluid channels ofthe I-type flange and the II-type flange through the first flange lining and the second flange lining; and the first flange lining and the second flange lining are cooling fluid entering and exitingports of the double-layer corrugated pipe. The water-cooling expansion joint has the advantages that stress slow release, safe flow guiding and effective connection of high-temperature pipelines of anarc air tunnel diffuser are achieved, and pull cracks and flow guiding and sealing failures caused by the high temperature to an expansion joint of the arc air tunnel diffuser are prevented.

Description

technical field [0001] The invention relates to the technical field of design and manufacture of high-temperature pipeline connections, in particular to a large-scale (diameter up to 2m) high-temperature gas (over 6000K) transport pipeline connection and a water-cooled expansion joint for stress relief and a design method thereof. Background technique [0002] The diffuser is an important component system of the arc wind tunnel, and expansion joints are usually installed at the position of the straight pipe of the diffuser to relieve stress. Different from conventional high-speed wind tunnels, the arc wind tunnel diffuser pipeline transports high-enthalpy gas (the high-enthalpy value can reach 30MJ / kg, and the temperature can exceed 6000K). Commonly used industrial standard expansion joints cannot meet the requirements of the diffuser connection and application. The main reasons are as follows: First, the temperature of the gas flowing in the diffuser of the arc wind tunnel...

AI Technical Summary

Problems solved by technology

[0004] (1) The existing standards for pipeline connection expansion joints are only applicable to pipeline connections for fluids with low temperature (below 1000K), and there are no relevant standards and standards for the design of pipeline connection expansion joints for arc wind tunnel diffusers with fluid temperatures exceeding 6000K method

[0005] (2) The bellows of conventional standard expansion joints are not designed with water cooling, and will be damaged due to excessive thermal deformation and cracking, which cannot meet the connection requirements of arc wind tunnel diffuser pipes

[0006] (3) There is usually no guide ring plate in the conventional standard expansion joint. Even if the design of the guide ring plate is added, the water cooling design is not adopted, and it will fail due to high temperature, which cannot meet the arc wind tunnel diffuser pipe expansion joint connection. Diversion within the segment

[0007] (4) The end face connection flange of the industrial standard expansion joint does not adopt the water cooling design, which will cause the pipe connection seal failure due to the high temperature of the flange, which cannot meet the requirements of the arc wind tunnel diffuser pipe connection

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