Variable frequency air conditioner low-frequency operating control method and control device

Abstract

The invention discloses a variable frequency air conditioner low-frequency operating control method. The variable frequency air conditioner low-frequency operating control method comprises the steps that a first frequency value, a second frequency value,..., the Nth frequency value are set between a smallest frequency value and a largest frequency value in low-frequency operating from small to large, N is larger than or equal to two, and the Nth frequency value is larger than the smallest frequency value and is smaller than or equal to the largest frequency value; when a compressor operates below the largest frequency value in low-frequency operating, the compressor operates for more than 2 min under the first frequency value, the second frequency value,..., the Nth frequency and the largest frequency value respectively; the frequency of the compressor in the low-frequency operating period is acquired, and when the compressor operates for 30 min to 35 min continuously with the operating frequency of the compressor below the largest frequency value in low-frequency operating, the compressor operates for 2 min to 3 min for oil return with the frequency rising to the oil return frequency, and then the compressor operates with the frequency reduced to the frequency value before frequency rising. An air conditioner can effectively operate under the low frequency for a long time, the air conditioner can operate in an energy-saving mode, meanwhile, rotating speed control over corresponding inner and outer fans is matched, an air conditioning system can operate stably and safely, and meanwhile a stable temperature field is provided for the interior of a room.

Description

technical field [0001] The invention relates to the technical field of frequency conversion air conditioners, in particular to a method and device for controlling low frequency operation of frequency conversion air conditioners. Background technique [0002] China's domestic household inverter air conditioners have developed from AC inverters to today's mainstream DC inverters. The main principle is to achieve rapid cooling and rapid heating by adjusting the operating frequency of the compressor. The main features of today's household inverter air conditioners are as follows: [0003] In cooling mode, the operating frequency of the compressor is basically between 25HZ and 100HZ; [0004] The speed of the indoor fan is not directly related to the operating frequency of the outdoor compressor, and is specified by the user; [0005] The outdoor fan and the compressor start and stop synchronously, that is, when the compressor is running, the fan is running, and when the compre...

AI Technical Summary

Problems solved by technology

[0007] Since the minimum operating frequency of the air conditioner is around 25HZ in the cooling mode of the air conditioner, the cooling capacity of the air conditioner is also relatively large at low frequency, causing the air conditioner system to start and stop frequently;

[0008] Even when the air conditioner is running at the lowest operating frequency, the power consumption is relatively high, and at the same time the outdoor fan is in normal operation, further increasing power consumption;

[0009] When the compressor of the air conditioning system is running at a low frequency, if the indoor fan is running at a high wind speed, the outlet temperature will be relatively high, which will affect the user experience; and when the compressor is running at a low frequency, it is easy to burn out, so the existing technology cannot guarantee Compressor runs stably at low frequency

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