A built -in low -temperature pump nitrogen screen bending pipe manufacturing process

Abstract

The invention discloses a manufacturing process of a built-in low temperature pump nitrogen screen elbow, including the steps of elbow manufacturing, filling, rolling forming and distortion monitoring. , put it into a three-wheel roll bender equipped with a shape-correcting wheel for roll bending, and finally use a laser generator to monitor the twisting condition of the bend. The present invention uses the spiral welded pipe made of Inconel625 alloy material as the main body of the elbow, which has the advantages of low induced eddy current and small occupied space compared with other material elbows; the improved rolling forming equipment and torque monitoring are matched The device, on the basis of using the spiral welded pipe made of Inconel625 alloy material as the main body of the elbow, can ensure that its ellipticity and twisting range can be controlled within an appropriate range.

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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