Control method of electronic expansion valve of indoor machine during refrigerating of convertible frequency air conditioner

Abstract

The invention discloses a control method of an electronic expansion valve of an indoor machine during refrigerating of a convertible frequency air conditioner. The control method comprises the following steps of: 1, judging whether a microprocessor of the indoor machine (8) is in a heating standby state; 2, regulating the openness of the corresponding indoor electronic expansion valve (7) to reach 30-50 paces by the microprocessor; and 3, keeping the openness of the indoor electronic expansion valve (7) in the step 2 for 2-6min, regulating the openness of the corresponding indoor electronic expansion valve (7) by the microprocessor according to temperatures transmitted by a liquid pipe temperature sensor (9) and an indoor heat exchanger coil temperature sensor (11) every 15-35S in accordance with the following rules: the openness of the regulated indoor electronic expansion valve (7) is equal to the sum of the openness of the indoor electronic expansion valve (7) before the regulation and the openness of the regulation of the indoor electronic expansion valve (7), and the openness of the regulation of the indoor electronic expansion valve (7) is equal to (T3-Tmin-A)*E+delta(T3-Tmin)*F. Compared with the prior art, the control method disclosed by the invention has the characteristics of being suitable for a one-more air conditioner, being capable of effectively ensuring stable operation of the system and improving heating efficiency of the system, being low in energy consumption, and ensuring that the temperature change range of an indoor environment is smaller and the comfort degree of the indoor environment is higher.

Description

technical field [0001] The invention relates to a control method for an electronic expansion valve of an indoor unit of a multi-frequency conversion air conditioner, in particular to a control method for an electronic expansion valve of an indoor unit of a frequency conversion air conditioner when the indoor unit is in cooling operation. Background technique [0002] One-to-multi-frequency 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 ho...

AI Technical Summary

Problems solved by technology

Patent No. 20071012061.7 "Air Conditioner and Method for Controlling Its Electronic Expansion Valve" proposes a proportional differential algorithm for the electronic expansion valve control of a one-to-one variable capacity system. The superheat value of this algorithm is a fixed value. If the When the fixed value is too large, the circulation of the gaseous refrigerant in the indoor unit in heating standby operation is increased, and the gaseous refrigerant returns to the liquid storage tank of the outdoor unit through the indoor electronic expansion valve, increasing the flow rate in the liquid storage tank. The enthalpy of the refrigerant reduces the heat absorption capacity of the refrigerant in the liquid storage tank after throttling, thereby reducing the energy efficiency of the whole system; if the set fixed value is too small, the refrigerant in the unit will gradually accumulate in the In the standby indoor unit, there is a lack of refrigerant circulating in the system, the temperature of the refrigerant entering the evaporator is different from the evaporation temperature, and there are faults such as the compressor exhaust temperature is too high, the energy consumption is high, and the life of the air conditioner is eventually shortened. , so it cannot effectively apply to one-to-many air conditioners with large loads; and the "Control Method of Electronic Expansion Valve" with the patent No. 200710090097.x proposes a fuzzy algorithm, but in this method, the initial adjustment of the electronic expansion valve The range is large, and the change of superheat is limited according to the exhaust temperature of the outdoor unit, so that the heat exchange capacity of the heat exchanger is limited, which in turn makes the exhaust temperature higher, which can easily cause the air conditioner to report failure or stop. , the operation stability is poor, and at the same time, the indoor environment temperature changes in a large range, the indoor environment comfort is low, and it cannot be well adapted to one drag multiple air conditioners

[0004] Therefore, the control method of the electronic expansion valve of the indoor unit in the prior art is not suitable for one-to-many air conditioners

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