Variable frequency air conditioner protection and control method and variable frequency air conditioner

Abstract

The invention provides a variable frequency air conditioner protection method. The method comprises the steps that an air conditioner is started up; input and output variables of a controller are selected, and the actual temperature difference and the actual temperature difference change rate during a sampling period are computed; the actual temperature difference and the actual temperature difference change rate are input at the input end of the controller; electric signals are output through the output end of the controller to control a compressor to operate in a set mode set through a remote controller; after the compressor operates for the first period, the controller starts to detect the air suction temperature of the compressor and compares the air suction temperature with a set compressor air suction temperature; if the air suction temperature of the compressor is less than a first lower-limit threshold value, a first interrupt request is generated; if the air suction temperature of the compressor is continuous less than the first lower-limit threshold value during the first detection period, the compressor is controlled to shut down, the controller starts to keep time again to the second period, interruption is ended, and the compressor is controlled to re-operate in the set mode set through the remote controlled. Meanwhile, the invention discloses a variable frequency air conditioner. The variable frequency air conditioner has the advantages of being stable in operation and good in use effect.

Description

technical field [0001] The invention relates to the technical field of air conditioning, in particular to a protection control method for an inverter air conditioner and an inverter air conditioner adopting the protection control method for an inverter air conditioner. Background technique [0002] The frequency conversion air conditioning system currently on the market mainly refers to the combination of frequency conversion speed regulation technology and mature electronic expansion valve adjustment method, using the microprocessor to receive the detection signal and adjust the output signal through PID to further control the up and down movement of the valve needle, thus Realize the precise control of the flow rate of the working medium in the refrigeration system, and avoid the frequent start and stop of the compressor. [0003] In an ideal inverter air conditioning system, when an ideal electronic expansion valve adjusts the system flow, it is hoped that the flow of liq...

AI Technical Summary

Problems solved by technology

However, the evaporators used in the prior art are not ideal evaporators. If one or more of them is blocked and the cooling capacity of the air conditioner needs to be increased, the actual refrigerant flow rate entering the evaporator will be higher than the actual flow rate. The demand is low, and the superheated temperature at the outlet of the evaporator will continue to rise. For a period of time, the liquid supply has been less than the demand, causing the evaporator to freeze or

Images