Frequency control method and device and variable frequency air conditioner

Abstract

The invention provides a frequency control method and device and a variable frequency air conditioner, and relates to the technical field of air conditioners. The frequency control method comprises the steps that when the variable frequency air conditioner is in a refrigeration mode, the exhaust temperature of a compressor and the coil temperature of an indoor unit are obtained in real time; a basic frequency is determined according to the exhaust temperature of the compressor, and a supplement frequency is calculated according to the coil temperature of the indoor unit; and according to the basic frequency and the supplementary frequency, the highest frequency allowed by the compressor to operate under the current working condition is calculated. The highest frequency of allowed operation is limited through the exhaust temperature of the compressor and the coil temperature of the indoor unit, and the high-temperature refrigerating capacity is improved to the maximum extent on the premise that reliability is ensured.

Description

technical field [0001] The present invention relates to the technical field of air conditioners, in particular to a frequency control method, a frequency control device and an inverter air conditioner. Background technique [0002] With the advancement of frequency conversion technology, frequency conversion air conditioners are more and more trusted by consumers due to their advantages such as precise temperature control and low energy consumption. Ordinary fixed-frequency air conditioners have a better cooling effect. Although high-frequency operation can obtain higher refrigeration capacity, due to the limitation of the configuration of the condenser, it is not allowed to increase the frequency without limit, otherwise it will lead to high operating pressure of the refrigeration system and quality problems such as high-pressure wear of the compressor. [0003] At present, inverter air conditioners mostly limit the maximum frequency allowed to operate by monitoring the ou...

AI Technical Summary

Problems solved by technology

Although high-frequency operation can obtain higher refrigeration capacity, due to the limitation of the configuration of the condenser, it is not allowed to increase the frequency without limit, otherwise it will lead to excessive operating pressure of the refrigeration system and quality problems such as high-pressure wear of the compressor.

[0003] At present, most variable frequency air conditioners limit the maximum frequency allowed to operate by monitoring the outdoor temperature, so as to ensure that the system pressure is within a reliable range. However, only by limiting the maximum frequency through the outer ring temperature, the system pressure cannot be accurately controlled, and the higher operating frequency cannot be fully utilized. Refrigeration capacity, leading to poor cooling effect of inverter air conditioner

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