Condensing unit, liquid spraying control method and control device thereof and air conditioner

Abstract

The invention provides a condensing unit, a liquid spraying control method and device of the condensing unit and an air conditioner. The liquid spraying control method comprises the steps that after the condensing unit starts a first adjusting valve on a main liquid spraying branch to spray liquid, operation parameters of the condensing unit are obtained; judging whether the operation parameters meet preset conditions or not; and when the judgment result is yes, the condensing unit is controlled to open a second adjusting valve on the auxiliary liquid spraying branch to adjust the liquid spraying amount together with the first adjusting valve. According to the liquid spraying control method, the two adjusting valves are used for jointly coordinating to spray liquid, accurate control over the liquid spraying amount of the condensing unit is achieved, compressor shutdown caused by insufficient liquid spraying amount is prevented, and suction liquid carrying caused by excessive liquid spraying amount is prevented; the refrigerating capacity loss caused by too large liquid spraying amount is reduced; and moreover, the liquid spraying amount range is controlled more widely, the adaptability of the unit is improved, and comfortable operation can be maintained under the high-pressure-ratio working condition.

Description

technical field [0001] The invention belongs to the field of condensing units, and in particular relates to a condensing unit and a liquid spray control method thereof, a control device and an air conditioner. Background technique [0002] Compared with common air conditioners, the condensing unit has a lower cooling temperature and a larger operating pressure ratio, so the exhaust temperature is higher. During summer cooling, the condensing units on the market often cause the compressor to stop due to the high temperature of the compressor motor. At present, some manufacturers use liquid injection to cool the compressor, but the liquid injection is only controlled by the liquid injection solenoid valve, which has only two states: on and off. The liquid injection solenoid valve cannot control the liquid injection volume. If the liquid injection volume is insufficient, the temperature of the compressor motor will be too high and the compressor will stop; machine. [0003] ...

AI Technical Summary

Problems solved by technology

During cooling in summer, condensing units on the market often cause the compressor to stop due to the high temperature of the compressor motor

At present, some manufacturers use liquid injection to cool down the compressor, but the liquid injection is only controlled by the liquid injection solenoid valve, and there are only two states: on and off.

The liquid injection solenoid valve cannot adjust the liquid injection volume. If the liquid injection volume is insufficient, the temperature of the compressor motor will be too high, and the compressor will stop. If the liquid injection volume is too large, too much cooling capacity will be consumed, and even the suction will be filled with liquid, which will damage the compression. machine

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