Control method and system for double-valve heat pump system

Abstract

The invention provides a control method for a double-valve heat pump system. The double-valve heat pump system is characterized in that a first electronic expansion valve and a second electronic expansion valve of the double-valve heat pump system are arranged in parallel, and the adjusting width of the first electronic expansion valve is smaller than that of the second electronic expansion valve;the control method comprises the following steps that the target temperature and the target superheat degree are set, the current environment temperature is detected in real time, and the actual superheat degree is obtained; when the current environment temperature is smaller than the target temperature, a small valve mode is started, and the first electronic expansion valve is started; when thecurrent environment temperature is larger than the target temperature, a large valve mode is started, and the second electronic expansion valve is started; and when the actual superheat degree is still greater than the target superheat degree after the opening degree of the second electronic expansion valve is the maximum opening degree, a big-small valve mode is started, and the first electronicexpansion valve and the second electronic expansion valve are started. According to the control method, adjusting precision of a refrigerant can be effectively improved, and the refrigerant adjustingrange is enlarged. The invention further provides a double-valve heat pump system.

Description

technical field [0001] The invention relates to the technical field of heat pump control, in particular to a control method and system for a double-valve heat pump system. Background technique [0002] Usually, heat pump air conditioners use thermal expansion valves as throttling devices, so that heat pump air conditioners can operate in a wide range of ambient temperatures. [0003] In the prior art, the thermostatic expansion valve adjusts the refrigerant through mechanical adjustment, and the opening of the valve is not easy to carry out data collection and monitoring; and due to factors such as processing accuracy and installation, the actuator diaphragm of the thermal expansion valve is prone to deformation and affects In addition, although the thermal expansion valve can adapt to the adjustment of a wide ambient temperature range, the thermal expansion valve has a limited adjustment range, resulting in a small flow adjustment range of the heat pump air conditioner. C...

AI Technical Summary

Problems solved by technology

[0004] The embodiment of the present invention provides a control method and system of a double-valve heat pump system to solve the technical problems that the heat pump air-conditioning unit uses a thermal expansion valve to adjust the refrigerant, resulting in low adjustment accuracy and a small adjustment range, so as to effectively improve the heat pump. Improve the adjustment accuracy of the refrigerant of the air conditioning unit, and expand the adjustment range of the refrigerant

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