Multi-online draught fan control method and device, and air conditioner

Abstract

The invention provides a multi-online draught fan control method. i draught fans are arranged, wherein i is larger than or equal to 2 and smaller than or equal to 3. The multi-online draught fan control method comprises the steps that the initial rotating speeds of the i draught fans are detected and denoted as x<ij>, wherein j is an element of a set, namely [2,i]; and the rotating speeds f<ij> ofthe i draught fans are controlled to be subjected to pulse-type periodic change based on the initial rotating speeds x<ij>, and the rotating speed change directions of the adjacent draught fans are opposite. According to the multi-online draught fan control method, the superposition action of sound waves and vibration can be effectively prevented, the good noise reduction effect is achieved, andthe property of a complete machine unit is improved.

Description

technical field [0001] The invention relates to the technical field of air conditioning, in particular to a multi-connected fan control method and device and a corresponding air conditioner. Background technique [0002] At present, household air conditioners mostly adopt a multi-connected structure, that is, there are two or more outdoor fans. When multiple fans rotate at the same speed, resonance will occur due to the consistency of structure and frequency, which will cause the superposition of sound waves and vibration waveforms among multiple fans, forming beat vibration and generating noise. In order to reduce noise, researchers have tried to silence the noise in many ways. [0003] For example, if an asymmetric fan blade structure is designed, as shown in Figure 1(a), multiple fan units use different blades and leaf shape combinations to make the natural frequencies of the fans different, thereby reducing resonance during operation; There are obvious deviations in th...

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Problems solved by technology

[0004] Although the two improvements can achieve a certain noise reduction function, the former needs to increase the types of fans. At the same time, the number of blades and the inconsistent shape of the blades will aggravate the uneven air volume in different parts of the same unit, which will affect the heat exchange. Asymmetry will lead to instability of the electrical parameters of the whole machine; while the latter is only a fixed difference in speed, the fixed difference will still form a stable superposition of vibration waveforms and sound waves, resulting in greatly reduced effectiveness of noise reduction, and There are differences among multi-connections, and different multi-connections need to correspond to different differential treatments, so that the fixed difference processing cannot be fully applied to all multi-connections, which makes the adaptability of this improved method poor, and this method will also lead to the same unit. Uneven air volume in different parts

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