Efficient filter replacement judging method and fresh air unit

Abstract

The invention discloses an efficient filter replacement judging method and a fresh air unit. The judging method comprises the following steps of: testing the corresponding resistance of the efficientfilter under different air volumes through experiments in a final resistance state, and plotting an air volume-resistance curve LQ-P; acquiring the air volume passing through the efficient filter andlooking for a reference resistance Pr corresponding to the air volume through the air volume-resistance curve; detecting the real-time resistance P of the efficient filter, comparing the real-time resistance with the reference resistance Pr, and judging whether the efficient filter needs to be replaced according to the comparison result. According to the invention, by testing the real-time resistance of the efficient filter and comparing the reference resistance of the filter in the final resistance state, the method can accurately judge whether the filter reaches the service life and needs tobe replaced, and can eliminate the influence of other factors on the judgment and avoid the unreasonable utilization of the filter.

Description

technical field [0001] The invention relates to the technical field of air treatment, in particular to a judging method for replacing a high-efficiency filter and a fresh air unit. Background technique [0002] In the field of air treatment systems, due to the impact of smog, currently domestic fresh air units are equipped with smog filtration systems, most of which include multiple filters such as coarse-effect filters, electrostatic filters, and high-efficiency filters. Air is filtered. During the use of the fresh air unit, most of the haze in the fresh air introduced into the room is absorbed in the filter system. As the adsorbed smog increases, the performance of the filter will decrease, including the increase of filter resistance and the decrease of filtration efficiency; therefore, the filter has a certain service life. Among them, coarse-effect filters and electrostatic filters can generally be recycled by washing and cleaning, while high-efficiency filters are dis...

AI Technical Summary

Problems solved by technology

However, this method of passing time judgment cannot accurately judge the life of the high-efficiency filter. If the smog is serious within one month, the life of the high-efficiency filter may have been reached for less than one month. If the air quality is better within one month, the high-efficiency filter may be of good quality, and it will be replaced before its service life is reached, which will cause waste and increase The operating cost of the fresh air unit

[0004] In addition, there is a filter life judgment method is to increase the pressure difference sensor to detect the resistance of the filter. When the resistance is higher than the set limit, it is judged that the filter has reached the end of its life. However, this method cannot rule out the resistance of the ventilation pipe and the resistance of other filters. The effect on the resistance of high-efficiency filters, so this method is only applicable to air purifiers that have no ventilation ducts and only use a single-layer filter. For fresh air units that require ventilation ducts and have multiple filters, this method is obviously not applicable

[0005] Therefore, in view of the problems existing in the above-mentioned existing technologies, it is necessary to carry out research and development to provide a solution to accurately determine the life of the high-efficiency filter of the fresh air unit and avoid the situation of unreasonable use of the high-efficiency filter

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