Service-life judging method for filter of filtration-type machine set and filtration-type machine set

Abstract

The invention discloses a service-life judging method for a filter of a filtration-type machine set and the filtration-type machine set. The filtration-type machine set comprises an air fan and the filter, and the air fan comprises a motor. The service-life judging method for the filter comprises the following steps that the output constant air amount of the filtration-type machine set is controlled by adjusting the duty ratio and the rotary speed of the motor; after the rotary speed of the motor reaches the maximum rotary speed nmax, the motor is controlled to operate at the maximum rotary speed nmax, the output air amount of the filtration-type machine set begins to be attenuated, the required duty ratio for the motor to maintain the maximum rotary speed nmax declines; and whether the filter reaches the service life or not is judged according to the operating time of the motor at the maximum rotary speed or according to the relation between the actual duty ratio and the preset duty ratio PWMh of the motor. By means of the service-life judging method for the filter of the filtration-type machine set and the filtration-type machine set, the service life of the filter can be accurately judged, the hardware cost does not need to be added, and it is guaranteed that the service life of the filter can reach the maximization.

Description

technical field [0001] The invention relates to the technical field of air treatment, in particular to a method for judging the life of a filter of a filter unit and the filter unit. Background technique [0002] For filter units (that is, air handling units with fans and filters, such as fresh air fans, haze removers, air purifiers, or air conditioners, etc.), the filters will continue to get dirty during their work Clogging will increase the filter resistance (that is, the static pressure of the system), and the air permeability will decrease. When the filter is dirty and clogged to a certain level and cannot be used, it is considered that the filter has reached the end of its service life, so it needs to be replaced in time or clean the filter. [0003] In the prior art, the method of judging the service life of the filter is commonly used to estimate according to the operating time of the filter, and then the unit reminds the user to replace or clean it according to the...

AI Technical Summary

Problems solved by technology

For example, during the operation of the unit, when the preset running time ends, the user is reminded to replace or clean the filter. This method has many disadvantages. For example, the environment in which the unit is used cannot be judged, and the air quality cannot be judged for a period of time, which will lead to filter failure. The amount of dust collected by the filter cannot be judged, often the unit does not prompt to replace the filter but the unit has no output air volume, or the unit is obviously operating normally and the unit will prompt to replace the filter

In addition, in the prior art, there is also a method of adding pressure difference sensors before and after the filter in the unit to judge the life of the filter. This method needs to add a pressure difference sensor, which will lead to high unit cost and complicated structural system design on the one hand. On the one hand, the dust collection at the intake end has a great impact on the accuracy of the sensor, which may also lead to inaccurate judgment of the filter life

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