Manufacturing method of split welded hot end heat exchanger of coaxial pulse tube refrigerator

Abstract

The invention discloses a manufacturing method for a split welding type hot-end heat exchanger of a coaxial type pulse pipe refrigerating machine. The split welding type hot-end heat exchanger is jointly composed of a cold finger-shaped seat, a split heat exchanger body, a hot-end casing pipe, a compressor connecting pipe, a spilt pulse pipe seat and an inertial pipe connecting pipe. Comprehensiveinnovation is conducted on a hot-end heat exchanger structure of a traditional coaxial type pulse pipe refrigerating machine, and the manufacturing method has the great significance for actual application of the coaxial type pulse pipe refrigerating machine in the special fields such as aerospace and practical superconductivity.

Description

Technical field [0001] The invention belongs to the field of refrigeration and low-temperature engineering, and relates to a pulse tube refrigerator, in particular to a method for manufacturing a split welded hot end heat exchanger of a coaxial pulse tube refrigerator. Background technique [0002] According to the different relative positions of the pulse tube and the cold accumulator, the pulse tube refrigerator can be divided into three categories: linear type, U type and coaxial type. In the coaxial arrangement, the pulse tube and the cold accumulator are arranged concentrically, which is the most compact of the three arrangements. It can realize convenient coupling with the cooled device and is suitable for applications with special requirements for space and volume. More importantly, due to the long-term application history of Stirling refrigerators in military and space, most of the cooled components and Dewar structures are made into geometric shapes suitable for use with...

AI Technical Summary

Problems solved by technology

However, due to its structural characteristics, the integral heat exchanger often needs to be sealed with non-metallic O-rings and bolts when it is connected to the pulse tube seat of the fixed pulse tube. A large amount of heat will be dissipated in the heat exchanger. The non-metallic O-ring in direct contact with the heat exchanger is easy to age and deform in such a high-temperature environment, resulting in the leakage of the high-pressure gas medium, and the non-metallic O-ring is easy to damage the gas inside the heat exchanger after aging. The medium causes pollution. These potential problems will greatly affect the service life of the entire refrigerator. Regular maintenance and replacement of the non-metallic O-ring is required to avoid the leakage of the gas medium; O-rings and the way the bolts are fastened have a destructive effect

Space and military applications with long life requirements often prohibit the use of non-metallic O-rings. The alternatives are usually metal seals such as gold wires and silver wires. However, on the one hand, the cost has risen sharply. On the other hand, in essence, There are still great hidden dangers in the way of metal sealing with additional bolts. In the case of high impact, high vibration and long-term use, this sealing method is still not absolutely reliable.

Due to the structural characteristics, the integral slit hot-end heat exchanger of the coaxial pulse tube refrigerator is difficult to adopt a complete sealing and welding method, which has high reliability and high reliability in space and military applications for the coaxial pulse tube refrigerator. Applications in special fields where long life is required bring very adverse effects

Images