A mixed working medium low-temperature refrigeration cycle system and control method using an ejector

Abstract

The invention discloses a mixed working medium low-temperature refrigeration cycle system and control method using an ejector. The system includes a compressor, a condenser, a regenerator, a two-position three-way solenoid valve, an ejector, a capillary tube, an evaporator, directional valve and solenoid valve; the system realizes switching between start-up mode and refrigeration mode by controlling the different on-off of the two-position three-way solenoid valve; when the system is in the start-up mode, the injector circuit is opened, and the refrigerant does not pass through the evaporator. , the refrigerant separates out before entering the compressor and is injected as the secondary fluid of the ejector, so that the system can reduce the suction flow of the compressor, thereby effectively reducing the discharge pressure of the compressor; when the system is in cooling mode At this time, the two-position three-way solenoid valve is connected to the capillary, and the system switches to a single-stage compression heat recovery cycle to perform normal refrigeration work.

Description

A mixed working medium low temperature refrigeration cycle system and control method using an ejector technical field The invention belongs to refrigeration and low temperature technical field, be specifically related to a kind of mixed working medium low temperature refrigeration adopting ejector Circulation system and control method. Background technique In recent years, along with the continuous progress of science and technology and society, food industry, medical treatment, refrigeration and scientific research etc. The demand for low-temperature environments in many fields has further expanded, especially in low-temperature environments with temperatures below ‑40°C. When the cooling temperature is low At ‑40℃, the commonly used refrigeration cycle systems are multi-stage compression refrigeration cycle systems, cascade refrigeration cycle systems, self-recovery Stacked refrigeration cycle system and mixed refrigerant throttling refrigeration cycle system. T...

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Problems solved by technology

[0004] In order to solve the problem that the compressor exhaust pressure is too high at the initial stage of starting the mixed working medium throttling cycle system, the invention adds an ejector circuit on the basis of the traditional mixed working medium throttling cycle, so that the refrigeration cycle system has two kinds of operation mode, respectively start mode and cooling mode

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