Operation method for multi-temperature refrigerating machine with variable evaporating temperature

Abstract

The invention discloses a preparation method of a multi-stage temperature refrigerating machine with changeable evaporating temperature. The multi-stage temperature refrigerating machine comprises such parts as a single compressor, a condenser, a gas-liquid separator, a condensation evaporator, a throttle valve, an evaporator and a three-way flow distributing valve, and the used refrigerant is a multi-component non-azeotropic mixed refrigerant; on the basis of an original auto cascade cycle, the multi-stage temperature refrigerating machine is additionally provided with the evaporator used ina high temperature chamber or a variable temperature chamber, one or two three-way flow distributing valves; the refrigerating machine adjusts the components of the mixed refrigerant which is carriedinto the evaporator by the characteristic of the multi-component non-azeotropic mixed working substance to provide two stages or three stages of different evaporating temperatures under the same evaporating pressure, wherein, one stage of the evaporating temperature can be adjusted according to the user requirement. The suitable multi-component non-azeotropic mixed refrigerant consists of a low-boiling point working substance and a high-boiling point working substance, and the component refrigerant of the non-azeotropic mixed working substance is selected from one or more than one of the high-boiling point working substance and the low-boiling point working substance. The multi-stage temperature refrigerating machine 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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