Method for regulating normal operating frequency of DC inverter compressor

Abstract

The invention discloses a method for regulating normal operating frequency of a DC inverter compressor, which comprises the following steps of: constantly detecting the change of ambient temperature in each room in the running process of the DC inverter compressor; calculating the basic operating frequency of the DC inverter compressor according to the actually required percentage of an indoor unit; and correcting the basic operating frequency according to the change of the ambient temperature in the room. The operating frequency of the DC inverter compressor is subjected to frequency reduction regulation according to the change of the ambient temperature in the room, so the DC inverter compressor is more energy-saving; and when the capacity requirement is low, the operating frequency of the DC inverter compressor is reduced and the output capacity is low, so the temperature fluctuation is small after the indoor ambient temperature reaches the set temperature, the comfortable sensation of a human body is better, and the start-stop times of the DC inverter compressor can be reduced.

Description

technical field [0001] The invention relates to the field of air-conditioning control, in particular to a method for adjusting the normal operating frequency of a DC frequency conversion compressor. Background technique [0002] DC frequency conversion free drag air conditioner is a kind of air conditioner product with variable refrigerant flow rate. One outdoor unit can drag one or more indoor units according to the user's requirements. Different series of indoor units and different specifications of the same series of indoor units can be used at will. combination. The advantage of the DC inverter free tow air conditioner is that the DC inverter compressor can adjust the operating frequency of the DC inverter compressor according to the number of indoor units that are turned on and the capacity requirements. At present, the calculation of the capacity requirement of opening the indoor unit generally only roughly uses the nominal value of the indoor unit to represent the ca...

AI Technical Summary

Problems solved by technology

At present, the calculation of the capacity requirement of opening the indoor unit generally only roughly uses the nominal value of the indoor unit to represent the capacity requirement of the indoor unit, that is, the numerical value (nominal value) obtained by adding the rated nominal value of each open indoor unit is used as the value (nominal value) of the indoor unit. The capacity requirements of the indoor unit in the room, the cooling effect or heating effect of the indoor ambient temperature with the opening of the air conditioner, the difference between the indoor ambient temperature and the indoor environment set temperature is getting smaller and smaller, and the actual capacity demand of the indoor unit is also increasing small, and the traditional control method does not consider the change of the actual capacity demand. The capacity demand of the DC inverter compressor always adopts the nominal value of the indoor unit during operation. Therefore, the adjustment of the operating frequency of the conventional DC inverter compressor is often Causes the DC inverter compressor to run at a higher frequency, thereby reducing the energy saving performance of the air conditioner

Moreover, when the DC inverter compressor runs at a higher frequency, the output capacity is too large. When the set temperature is not reached, it always runs at a frequency of full load operation. When the set temperature is reached, the DC inverter compressor stops. When the temperature reaches a certain difference from the set temperature, the DC inverter compressor is started again, which leads to the frequent start and stop of the DC inverter compressor, which affects the accuracy of indoor ambient temperature adjustment and the indoor ambient temperature fluctuates greatly, affecting the comfort of the human body

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