Control method for heating operation of inverter air conditioner by electronic expansion valve

Abstract

The invention discloses a control method for the heating operation of an inverter air conditioner by an electronic expansion valve. When an inverter split air conditioner performs heating, the electronic expansion valve is subjected to opening control according to the exhaust and suction superheat of a compressor, and the exhaust superheat of the compressor cannot be deviated due to the influence of the length of a connecting pipeline between an indoor unit and an outdoor unit, so that the problem of fluctuation of the electronic expansion valve in the inverter air conditioner with a longer connecting pipeline between the indoor unit and the outdoor unit in the adjusting process during heating can be solved. The exhaust temperature of the compressor is controlled, so the exhaust temperature of the compressor cannot be overhigh, the compressor is ensured to normally run, and the air conditioner system can normally run.

Description

technical field [0001] The present invention relates to a control method, more specifically to a control method of an electronic expansion valve in heating operation of an inverter air conditioner. Background technique [0002] Frequency conversion capacity system, the refrigerant flow of the system varies widely according to the load during operation. Traditional throttling devices such as capillary tubes, orifice plates, thermal expansion valves, etc., cannot guarantee the stable operation of the system due to their narrow adjustment range. Therefore, electronic expansion devices are generally used. The valve regulates the flow. The electronic expansion valve has a large flow adjustment range, mature driving technology, flexible control, easy to achieve efficient operation of the system, and guarantees the service life of the system. It has gradually become the main throttling method in the variable frequency variable capacity system. [0003] The heating operation of sma...

AI Technical Summary

Problems solved by technology

Because these methods only control the electronic expansion valve according to the return air temperature of the air conditioner, the online pipeline between the outdoor unit and the indoor unit is relatively short for the inverter air conditioner, and the pressure loss of the online pipeline is relatively small, so that the excessive return air detected by the air conditioning system The difference between the heat and the actual value is relatively small. Therefore, the above two control methods can solve the problem of fluctuations in the electronic expansion valve of the inverter air conditioner when the online pipeline between the outdoor unit and the indoor unit is short when the air conditioner is heating. problem, but for the inverter air conditioner with a relatively long online pipeline between the outdoor unit and the indoor unit, since the inverter air conditioner increases with the length of the online pipeline, the pressure loss of the system pipeline will increase. Compared with the actual value, the superheat degree of the return air will have a large deviation, so that the optimal return air superheat degree of the air conditioning system cannot be determined. Therefore, it is obviously inaccurate to control the electronic expansion valve through the above two methods, so it cannot be solved. During heating, the online pipeline between the outdoor unit and the indoor unit is relatively long, and the electronic expansion valve of the inverter air conditioner fluctuates during the adjustment process

In addition, the above two methods do not control the exhaust temperature during the control process, and when the exhaust temperature is too high, the compressor will be damaged, thus affecting the safe operation of the system

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