Control method and device for electronic expansion valves of multiple chambers of refrigerating system and refrigerating system

Abstract

The invention discloses a control method and device for electronic expansion valves of multiple chambers of a refrigerating system and the refrigerating system. The control method comprises the following steps that 1, the running state of a compressor, the opening degree of the electronic expansion valves arranged in a thermal bypass and the actual temperature of each chamber are obtained, wherein each chamber is provided with a corresponding preset target temperature; 2, according to the actual temperature of each chamber, the temperature difference between the actual temperature of each chamber and the corresponding preset target temperature is determined; and 3, according to the running state of the compressor, the temperature difference and the current opening values of the electronic expansion valves which correspond to the chambers and are arranged in the thermal bypass, the opening values of the electronic expansion valves which correspond to the chambers and are arranged in the thermal bypass are controlled to be increased to a first preset value or decreased to a second preset value. According to the control method and device for the electronic expansion valves of the multiple chambers of the refrigerating system and the refrigerating system, heating output can be reduced, the purpose of saving energy is achieved, oil return of the compressor is easy, and the compressor is protected.

Description

technical field [0001] Embodiments of the present invention relate to refrigeration technology, in particular to a method and device for controlling a multi-chamber electronic expansion valve in a refrigeration system, and a refrigeration system. Background technique [0002] In the refrigeration system, for the refrigeration system of the environmental test equipment applied to the battery test, such as a multi-chamber refrigeration system, generally when the temperature of at least one chamber is constant for a long time, the refrigeration system and the heating system need to be operated simultaneously to keep the temperature constant. When the cooling capacity output by the refrigeration system is greater, the heating capacity output by the heating system is also greater, which consumes a lot of energy. Therefore, it is necessary to adjust the opening degree of the electronic expansion valve corresponding to the compartment, such as the thermal bypass electronic expansio...

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Problems solved by technology

[0003] At present, the existing control method of the multi-chamber electronic expansion valve in the refrigeration system is usually to adjust the opening of the electronic expansion valve within a certain range in order to prevent the temperature fluctuation of the compartments, such as adjusting the opening of the electronic expansion valve to increase a certain value or reduce a certain value, at this time the energy consumption of the refrigeration system still cannot be effectively reduced, and the energy consumption of the refrigeration system will still be large, affecting the energy-saving effect of the refrigeration system

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