High-reliability low-temperature refrigerator

Abstract

The invention discloses a high-reliability low-temperature refrigerator. The high-reliability low-temperature refrigerator comprises a compressor (1), a cover body module (2), an air distribution valve (6), a rotating valve (7), a motor (12), a cylinder (13) and an annular groove (23); a low-pressure exhaust hole (24), communicating with the annular groove (23), is formed in the cover body module(2) in the annular groove (23); an outlet end of the low-pressure exhaust hole (24) is connected with a low-pressure side of a compressor through a low-pressure air sucking pipeline (1b); the rotatingvalve (7) is provided with a low-pressure channel (73) communicating with the annular groove (23); and the other end of the low-pressure channel (73) communicates with a low-pressure groove (71) on the rotating valve (7). Through arrangement of the low-pressure exhaust hole and the low-pressure channel, dust generated by relative movement of the rotating valve and the air distribution valve is carried by low-pressure reflux gas, and is directly discharged through the low-pressure exhaust hole on the cover body module, so that the service life of equipment is prolonged.

Description

technical field [0001] The invention relates to the technical field of low-temperature refrigerators, in particular to a high-reliability low-temperature refrigerator which prevents low-pressure backflow gas from passing through a driving mechanism and a power mechanism by opening a low-pressure exhaust hole on a cover assembly. 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). figure 1 For this type of refrigerator, the high-pressure airflow provided by the compressor 1 enters the push piston placed in the cylinder 13 and reciprocates up and down through the air distribution mechanism RV (air distribution valve 6 and rotary valve 7), and is combined with the cold storage material. 10c for heat exchange, and then work and expand in the expansion chamber 9, and then pass through the pushing piston, flow out of the gas distribution mech...

AI Technical Summary

Problems solved by technology

During the long-term operation, the mutual wear between the gas distribution valve 6 and the rotary valve 7 produces a large amount of powder and debris, which flow together with the low-pressure return airflow and gradually accumulate on the surface of the connecting rod 5, and then in the process of reciprocating up and down During the process, the powder enters the narrow gap between the guide sleeve 4 and the connecting rod 5, which is likely to cause stagnation; at the same time, the remaining powder and debris continue to flow with the airflow, enter the motor 12, and accumulate in the motor 12. On the internal stator and rotor, it will cause problems such as the deterioration of the operating condition of the motor 12, the increase of the load, and the decrease of the torque; long-term accumulation will cause the driving mechanism and the motor to be stuck

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