Self-adaptive adjustment system and control method for charging amount in cooling process of ultra-low temperature refrigerator

Abstract

The invention discloses a self-adaptive adjustment system and control method for the charging amount of an ultra-low temperature refrigerator during cooling. Two-stage expansion tank-stop valve mechanism, and a two-stage electric heating device is provided on the outside of the two-stage expansion tank body. During the cooling process of the ultra-low temperature refrigerator, the system monitors the temperature in the box, the heat transfer temperature difference at the condensing evaporator, the subcooling degree of the low temperature subsystem and the superheat degree of the high temperature subsystem, and controls the opening and closing of the double-stage stop valve and the electric heating mechanism. , automatically adjust the refrigerant circulation volume of the low-temperature stage subsystem within the normal range, ensure the cooling speed of the system in the early stage of the cooling process, and accurately reduce the evaporation temperature of the system through the opening and closing of the double-stage stop valve-expansion tank mechanism in the later stage of the cooling process, achieving rapid , Enhanced cooling effect, if it exceeds the adjustment range, a corresponding fault prompt will be issued, which is convenient for manual and efficient solution to the problem of system charge.

Description

technical field [0001] The invention belongs to the technical field of refrigeration and low temperature, and in particular relates to a self-adaptive adjustment system and a control method for a charging amount in the cooling process of an ultra-low temperature refrigerator. Background technique [0002] In today's world, energy and environment are still the two focal issues that the world continues to pay attention to. With the significant improvement of people's quality of life, the demand for refrigeration technology in all walks of life has become more and more extensive, creating favorable opportunities for the development of low-temperature refrigeration industry. At present, my country has entered a critical period of economic development in transition. The new period, new situation and new development opportunities have put forward new requirements for the refrigeration technology involved in the fields of modern cryogenic medicine, blood and organ preservation, hig...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a self-regulating mechanism and control method for the amount of refrigerant charge in the cooling process of a low-temperature refrigerator, in view of the large calculation error of the charge amount of the ultra-low temperature refrigerator, the poor automatic adjustment of the refrigeration system, and the system operating conditions during the cooling process. Constantly changing, improper refrigerant charge leads to long cooling time of the refrigeration system or even failure to obtain the set low temperature environment. Provide a solution

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