Air-conditioner and control method thereof

Abstract

The invention provides an air-conditioner and a control method thereof. The air-conditioner comprises a first compressor and a second compressor which are arranged in parallel. The air-conditioner further comprises a first air suction pipe, a first air exhaust pipe, a second air suction pipe and a second air exhaust pipe, wherein the first air suction pipe and the first air exhaust pipe are connected to the first compressor, and the second air suction pipe and the second air exhaust pipe are connected to the second compressor. The air-conditioner further comprises a first temperature sensor, a second temperature sensor, a first regulating valve and a second regulating valve. The first temperature sensor is arranged on the first air exhaust pipe and used for acquiring the first air exhaust temperature of the first compressor, and the second temperature sensor is arranged on the second air exhaust pipe and used for acquiring the second air exhaust temperature of the second compressor. The first regulating valve is used for controlling the refrigerant suction volume of the first compressor, the second regulating valve is used for controlling the refrigerant suction volume of the second compressor, and the opening degree of the first regulating valve and / or the opening degree of the second regulating valve are / is determined through the difference value of the first air exhaust temperature and the second air exhaust temperature. According to the technical scheme, the problem that the refrigerant suction volumes of all the compressors in a parallel connection compressor set in an air-conditioner cannot be controlled easily in the prior art is effectively solved.

Description

technical field

[0001] The present invention relates to the technical field of air conditioners, in particular to an air conditioner and a control method thereof. Background technique

[0002] In light-duty commercial air-conditioning units, due to the comprehensive consideration of the characteristics of the scroll compressor and the scope of use, 10-hp and 12-hp compressors are the most commonly used and the most cost-effective. Therefore, when the required cooling capacity of the compressor unit reaches 60 hp, 70 hp or even greater, in order not to cause a large number of control components due to too many systems, generally a single system will use two 10-hp or 12-hp compressors machines in parallel. However, while using parallel compressor units to improve the cost performance, the pressure ratio of the units may be too high, too low or the refrigerant injection is too large. Excessive refrigerant injection can easily lead to an unbalanced phenomenon in which the devi...

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