Method for making multi-temperature refrigerator with variable vapourating temperature

Abstract

The invention discloses a preparation method of a multi-temperature refrigerator with variable evaporation temperature, which adopts a single compressor, a condenser, a gas-liquid separator, a condensation evaporator, a throttle valve, an evaporator and a three-way flow distribution valve. It is a component, and the refrigerant used is a multi-component non-azeotropic mixed refrigerant; on the basis of the original self-cascading cycle, an evaporator, 1 or 2 three-way flow distribution valves for high temperature compartments or variable temperature compartments are added, and the The characteristics of the multi-component non-azeotropic mixed working medium can adjust the composition of the mixed refrigerant entering the evaporator, and provide two or three different evaporation temperatures under the same evaporation pressure, and the evaporation temperature of the first stage can be based on user requirements. to make adjustments. The applicable multi-component non-azeotropic mixed refrigerant is composed of a low-boiling point working medium and a high-boiling point working medium, and one or more of the two groups of high-boiling point and low-boiling point working medium are selected as the component refrigerants of the non-azeotropic mixed working medium . It has the characteristics of convenient control and energy-saving operation.

Description

technical field [0001] The invention relates to a multi-temperature refrigerator which can provide a lower compartment temperature and has a variable evaporation temperature of one stage and the non-azeotropic mixed working medium used, especially relates to a kind of mixed refrigerant group which can be adjusted by entering into the evaporator The preparation method of the multi-temperature refrigerator with multi-stage evaporation temperature and the non-azeotropic mixed working fluid used are divided to realize the adjustment of evaporation temperature. Background technique [0002] The freezing and refrigeration of food or medical supplies is one of the most widely used areas of commercial refrigeration. At present, the main form of this type of device is the "one machine with multiple temperatures" refrigeration device. The "one machine with multiple temperatures" type refrigeration device is to adapt to the different storage temperatures of different storages. A refrig...

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Problems solved by technology

[0005] Aiming at the problems of the above-mentioned multi-temperature refrigerating machine, such as the reduction of the effective energy utilization coefficient and the difficulty in controlling the temperature of each compartment due to only having one-stage evaporation temperature, the purpose of the present invention is to provide a multi-temperature refrigerator with variable evaporation temperature. The preparation method of the refrigerator, which is based on the improved self-cascading refrigeration cycle, has two or three stages of different evaporation temperatures, and the evaporation temperature of the first stage can be adjusted within a certain range according to the required compartment temperature, and provides Non-azeotropic mixed working fluid suitable for this multi-temperature refrigerator

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