Mixed working medium low-temperature refrigeration cycle system adopting ejector and control method thereof

Abstract

The invention discloses a mixed working medium low-temperature refrigeration cycle system adopting an ejector and a control method thereof. The system comprises a compressor, a condenser, a heat regenerator, a two-position three-way electromagnetic valve, the ejector, a capillary tube, an evaporator, a one-way valve and an electromagnetic valve. According to the system, switching between a starting mode and a refrigerating mode is achieved by controlling different on-off states of the two-position three-way electromagnetic valve; when the system is in the starting mode, an ejector loop is opened, a refrigerant does not pass through the evaporator, and meanwhile, before the refrigerant enters the compressor, one path of the refrigerant is divided to serve as secondary fluid of the ejector to be ejected, so that the system can reduce the suction flow of the compressor, and the exhaust pressure of the compressor is effectively reduced; and when the system is in the refrigerating mode, the two-position three-way electromagnetic valve is connected with the capillary tube, and at the moment, the system is switched into a single-stage compression regenerative cycle to perform normal refrigeration work.

Description

technical field [0001] The invention belongs to the technical field of refrigeration and low temperature, and in particular relates to a mixed working medium low temperature refrigeration cycle system and a control method using an ejector. Background technique [0002] In recent years, with the continuous advancement of science and technology and society, the demand for low-temperature environments has further expanded in many fields such as food industry, medical treatment, refrigeration, and scientific research, especially low-temperature environments with temperatures below -40°C. When the refrigeration temperature is lower than -40°C, the commonly used refrigeration cycle system is multi-stage compression refrigeration cycle system, cascade refrigeration cycle system, self-cascade refrigeration cycle system and mixed refrigerant throttling refrigeration cycle system. [0003] The main feature of the mixed working fluid throttling refrigeration cycle system is that it use...

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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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