Self-decompression gas distribution mechanism and low-temperature refrigerator adopting the self-decompression gas distribution mechanism

Abstract

The invention discloses a self-decompression gas distribution mechanism and a corresponding low-temperature refrigerator. The self-decompression gas distribution mechanism includes a gas distribution valve (6) and a rotary valve (7). The back of the gas distribution valve (6) is covered with Divided into high-pressure surface (66) and low-pressure surface (65), the high-pressure surface (66) and low-pressure surface (65) are sealed by the third sealing ring (b3) that seals the gas distribution valve (6) and the cover body (2) Separated; the air distribution valve (6) is provided with a pressure relief hole (61) passing through the air distribution surface (64) and the low pressure surface (65) of the air distribution valve (6) along its axial direction. The hole (61) can communicate with the low-pressure passage (22) of the cover (2) and the back of the gas distribution valve (6), and introduces the low-pressure airflow in the cover (2) to the back of the gas distribution valve (6). The low-temperature refrigerator includes the above-mentioned self-decompression gas distribution mechanism. The present invention reduces the pressure receiving area, reduces the positive force and reduces wear through the arrangement of the decompression hole and the third sealing ring.

Description

technical field [0001] The invention relates to the technical field of low-temperature refrigerators, in particular to a self-decompression gas distribution mechanism which reduces positive pressure and wear by modifying the structure of the gas distribution valve, and a low-temperature refrigeration system using the self-decompression gas distribution mechanism. machine. Background technique [0002] A cryogenic refrigerator typified by a Gifford-McMahon (GM) refrigerator has an expander and a compressor for a working gas (also referred to as refrigerant gas). This type of refrigerator provides high-pressure airflow discharged from the compressor, and enters the push piston that is placed in the cylinder and reciprocates up and down through the gas distribution mechanism, exchanges heat with the cold storage material, and then expands in the expansion chamber, and then passes through the push piston. The piston flows out of the valve train and returns to the low-pressure c...

AI Technical Summary

Problems solved by technology

However, the high-pressure air hole 62 and the air hole 63 of the air distribution valve 6 have certain size and position requirements, so that the outer diameter D1 of the air distribution valve 6 cannot be too small, otherwise the high-pressure air hole 62 and the air hole 63 of the air distribution valve cannot be made.

In this way, the positive pressure of the joint is relatively large, and long-term operation will cause wear on the contact surface of the rotary valve 7 and the gas distribution valve 6, which will affect the performance of the equipment and reduce the reliability of the equipment.

Images