Impeller detection method in building centralized smoke exhaust system

Abstract

The invention relates to an impeller detection method in a building centralized smoke exhaust system. The impeller detection method is characterized by comprising the following steps of 1, after a user uses an indoor range hood, selecting to shut down, if necessary, entering indoor impeller self-detection, and closing an angle-adjustable electric check valve at the moment; rotating an indoor fan in the indoor range hood according to a first preset gear Ti, collecting the rotating speed Ni of the indoor fan at the moment after the rotating speed is stable, continuously collecting the rotating speed of the indoor fan for k times if Ni is larger than Na, sorting the rotating speeds of the indoor fan for k times, selecting a maximum value and a minimum value, calculating an average value, selecting values with large deviation for two times, and separately marking the values as mi1 and mi2; and enabling q to be equal to (mi2 / mi1)<2>, comparing q with the comparison coefficients qa and qb, and in different gears of continuous r1 times, if q is larger than qa and smaller than or equal to qb, judging that the indoor impeller of the corresponding indoor range hood is eccentric and unbalanced in load due to oil stain accumulation of the indoor impeller. Compared with the prior art, the impeller detection method has the advantage that the obtained judgment conclusion is more accurate.

Description

technical field [0001] The invention relates to an impeller detection method in a building centralized smoke exhaust system. Background technique [0002] At present, most of the range hoods used in the kitchens of houses and apartments are independent. Holes in the windows or walls are used to set the exhaust port of the range hood. The oil fume is discharged directly from the outer wall, which will cause pollution interference to the residents on the upper and lower floors, and will cause oil pollution to the outer wall. At the same time, it will also affect the overall appearance of the building. [0003] With the high-speed development of economy, more and more high-rise residential buildings have sprung up like mushrooms after rain. In order to maintain the appearance and image of the entire building, in many high-rise residential buildings, a centralized smoke exhaust system for the building will be adopted for centralized smoke exhaust. The public flue, the outdoor ...

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Problems solved by technology

[0004] In recent years, the air outlet of the user-side indoor range hood is connected to the public flue through an adjustable angle valve. The outdoor main fan system is equipped with a centralized filtration system, which has begun to be used in some well-decorated buildings. The outdoor main fan system is aimed at different indoor The operating rate of the range hood is controlled by frequency conversion, or the flow distribution is realized by adjusting the angle of the adjustable angle valve on different floors; in the centralized smoke exhaust system of the building, the outdoor main fan system and the indoor range hood are often equipped with impellers. Therefore, the separation degree of grease can be effectively improved, but after a certain period of use, since indoor range hoods and outdoor main fan systems are mostly installed vertically with radial fans, and the impellers are generally installed vertically, the accumulation of oil stains on the lower part of the impellers will be biased. And when the range hood is turned off, the separated grease will stay in the lower part of the impeller, which will intensify the accumulation of oil, which will lead to the eccentricity of the impeller and the unbalanced load.

At present, only regular cleaning and maintenance of the impeller can be used in the market to alleviate the eccentricity and load imbalance of the impeller.

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