Manufacturing process of built-in low-temperature pump nitrogen screen bent pipe

Abstract

The invention discloses a manufacturing process of a built-in low-temperature pump nitrogen screen bent pipe. The manufacturing process comprises the steps of bent pipe manufacturing, filling, rollingand bending forming and twisting monitoring. An bent pipe main body is made of an Inconel 625 alloy material; after the bent pipe is filled with quartz sand, the bent pipe is put into a three-wheel rolling bender additionally provided with correction wheels for rolling and bending forming; and finally, laser generators are used for monitoring the distortion condition of the bent pipe. According to the manufacturing process of the built-in low-temperature pump nitrogen screen bent pipe, a spiral welded pipe made of the Inconel 625 alloy material is used as the bent pipe main body, and comparedwith bent pipes made of other materials, the built-in low-temperature pump nitrogen screen bent pipe has the advantages of being low in induced eddy current and small in occupied space; and the matched improved rolling and bending forming equipment and the torque monitoring device can ensure that the ellipse degree and the distortion amplitude can be controlled within a proper range on the basisof using the spiral welded pipe made of the Inconel 625 alloy material as the bent pipe main body.

Description

technical field [0001] The invention relates to the technical field of manufacturing nuclear fusion devices, in particular to a manufacturing process for a built-in cryogenic pump nitrogen screen bend. Background technique [0002] The tokamak device has high plasma parameters. In order to better control the plasma density and discharge neutral gases, the pumping system is required to have a higher pumping speed, especially the discharge with high parameters requires a larger instantaneous pumping rate and better performance. At present, a built-in cryopump is used to meet its needs. The above-mentioned built-in cryopump includes a number of circular arc structures that form a circle. The internal nitrogen screen elbow, the nitrogen screen elbow in the prior art has the defects of large volume and high induced eddy current. In addition, it is also prone to distortion during the manufacturing process, and it is difficult to meet the performance requirements of the built-in c...

AI Technical Summary

Problems solved by technology

At present, a built-in cryopump is used to meet its needs. The above-mentioned built-in cryopump includes a number of circular arc structures that form a circle. The internal nitrogen screen elbow, the nitrogen screen elbow in the prior art has the defects of large volume and high induced eddy current. In addition, it is also prone to distortion during the manufacturing process, which makes it difficult to meet the performance requirements of the built-in cryopump.

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