Method for preparing multi-temperature refrigerator with variable evaporation temperature

Abstract

The invention discloses a method for operating a multi-temperature refrigerator with variable vaporization temperature. A single compressor, a condenser, a gas-liquid separator, a condensation evaporator, a throttle, an evaporator and a three-way flux distributing valve are used as components. Multi-non-azeotropic mixture refrigerant is used as refrigerant. Based on original self overlapping circulation, the evaporator which is used in a high temperature chamber or a variable temperature chamber and one or two three-way flux distributing values are added; the component of mixed refrigerant entering into the evaporator is regulated by the characteristic of multi-non-azeotropic mixture; two grades or three grades different evaporation temperatures are provided under same evaporation pressure; and one grade evaporation temperature thereof can be adjusted according to the requirement of the user. The applicable multi-non-azeotropic mixture refrigerant consists of low-boiling point workingfluid and high-boiling point working fluid, and one or several are selected from two sets of the high-boiling point working fluid and the low-boiling point working fluid to be used as component refrigerant of the non-azeotropic mixture. The invention 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 operation method of the multi-temperature refrigerator with multi-stage evaporation temperature and the non-azeotropic mixed working medium used to realize the adjustment of the 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 refrigeration s...

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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 operation method of the refrigerator, which is based on the improved self-cascading refrigeration cycle, has two or three 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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