Control method and device for multi-chamber electronic expansion valve of refrigerating system and refrigerating system

Abstract

An embodiment of the invention discloses a control method and device for a multi-chamber electronic expansion valve of a refrigerating system and the refrigerating system. The method comprises the steps that the on-off state of each electromagnetic valve in the refrigerating system, the opening degree of each electronic expansion valve, the actual temperature of each chamber, the heating output quantity of a heater of each chamber and the evaporation temperature and the evaporation pressure of an evaporator of each chamber are obtained; a first temperature difference between the actual temperature of each chamber and a preset target temperature is determined, and a second temperature difference between the actual temperature of each chamber and the evaporation temperature is determined; and when the electromagnetic valves corresponding to the chambers are in the conducting states, according to the first temperature differences, the second temperature differences, the heating output quantities of the chambers and the current opening degree values of the electronic expansion valves corresponding to the chambers, the opening degree values of the electronic expansion valves corresponding to the chambers are controlled to be increased or decreased by the preset opening degree value. According to the technical scheme, temperature fluctuations of the chambers can be avoided, the heat transfer temperature difference and the system flow can be guaranteed, and the pressure of the low-pressure end of the system is prevented from being changed into negative pressure.

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] The electronic expansion valve adjusts the liquid supply of the evaporator according to the preset program. Because it belongs to the electronic adjustment mode, it is called an electronic expansion valve and is widely used in refrigeration systems. For a refrigeration system with multiple compartments, the flow in the passage between the compressor and the compartments is controlled by adjusting the opening of the electronic expansion valve in the passage. If the opening of the electronic expansion valve corresponding to the compartment is not adjusted properly, it is easy to cause the compartment and Other issues such as temperature fluctuations in the operating state, abnormal heat transfer temperatu...

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Problems solved by technology

[0003] At present, the existing control methods for multi-chamber electronic expansion valves in refrigeration systems usually control the opening of the electronic expansion valve by performing calculus on the deviation of the return air superheat of the system, or adjust the electronic expansion valve according to the temperature difference between the inlet and outlet of the evaporator. The opening degree, that is, the opening degree of the electronic expansion valve is adjusted only by a single factor, which affects the reliability of the control, may cause temperature fluctuations in the compartments, and affect the normal operation of the operating compartments in the refrigeration system

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