Method for controlling electronic expansion valve of heating standby indoor unit

Abstract

The invention relates to a method for controlling an electronic expansion valve of a heating standby indoor unit, and the method comprises the following steps: (1) the judgment of whether a micro-processor of the indoor unit (8) is in the heating standby state or not is carried out; (2) the micro-processor adjusts the open degree of the corresponding indoor electronic expansion valve (7) to 60-80steps; and (3) the micro-processor regulates the corresponding indoor electronic expansion valve (7) by two principles that (T1 minus T3) is less than 5 and (T1 minus T3) is not less than 5 accordingto the temperatures which are returned by a liquid pipe temperature sensor (9), an indoor heat exchanger coil pipe temperature sensor (10) and an indoor environment temperature sensor (11) in each 60s. Compared with the prior method, the method is characterized in that the method can effectively ensure the system to operate stably and improve the heating effect of a system.

Description

Technical field: [0001] The invention relates to a method for controlling an electronic expansion valve of an indoor unit on heating standby. Background technique: [0002] One-to-multi-inverter air conditioner, one outdoor unit can drive multiple indoor units to run, which not only saves the installation space of the outdoor unit, but also has the advantages of simple system installation, compact structure, and comfort. Each room can be independently adjusted and operated, which can meet the needs of different rooms. Different air-conditioning load requirements, high comprehensive performance coefficient, energy saving and other advantages. With the development of the economy, one-drag multi-frequency heat pump air conditioners are more and more widely used in domestic households. [0003] One-to-multi-inverter air-conditioning unit, each indoor unit has a corresponding electronic expansion valve. However, only some of the multiple indoor units are in the heating operati...

AI Technical Summary

Problems solved by technology

[0004] 1. When the opening of the set electronic expansion valve is too large, this increases the circulation of the gaseous refrigerant in the indoor unit in the heating standby mode, and the gaseous refrigerant returns to the liquid storage tank of the outdoor unit through the indoor electronic expansion valve. Increase the enthalpy of the refrigerant in the liquid storage tank, reduce the heat absorption capacity of the refrigerant in the liquid storage tank after throttling, thereby reducing the energy efficiency of the whole system;

[0005] 2. When the opening of the set electronic expansion valve is too small, the refrigerant in the unit will gradually accumulate in the standby indoor unit, resulting in the lack of refrigerant circulating in the system, and the discharge temperature of the compressor will appear. Too high and other faults

[0006] Therefore, the control method in the prior art has the problems of unstable system operation and low heating efficiency of the system.

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