Air resistance recognition method for fresh air purification system and device thereof

Abstract

The invention relates to a wind resistance identification method and device of a fresh air purification system. The motor driver of the fan identifies the parameter changes of the power input power, output phase voltage, output current and motor speed of the motor caused by the wind resistance change of the filter screen and recognizes the Calculate the parameter value; then compare the calculation result with the set wind resistance warning parameter and send the comparison result to the controller; the controller sends a wind resistance warning signal to remind the user to replace or clean the filter. The present invention can calculate the change of the wind resistance of the mechanical ventilation system and the air purification system online by observing and comparing the changes of the parameters in the running state of the fan motor in real time, not only can understand the running state of the system in time, improve the operating efficiency of the system, and reduce the maintenance cost of the system; and It can remind the user to replace or clean the filter screen in time without installing any external instruments or sensors, saving equipment costs and installation costs.

Description

technical field [0001] The invention relates to the field of air monitoring, in particular to a method and device for identifying wind resistance of a fresh air purification system. Background technique [0002] When the fresh air purification system is working, fresh air is introduced from the outside and supplied to the room after being filtered by the filter, so as to improve the indoor air quality. The filter in the fresh air purification system is a consumable and needs to be replaced regularly. The use time of the filter is related to the air quality, that is, the more dust there is outside, the more frequently the filter needs to be replaced. [0003] At present, the usual way to replace the filter screen is: 1. There will be an approximate use time in the manual of the fresh air purification system, and the user can replace the filter screen of the fresh air fan by himself according to the use time. However, in reality, the air quality varies from place to place, e...

AI Technical Summary

Problems solved by technology

Therefore, the user's own estimation of the replacement time of the filter is very inaccurate. If the filter is replaced early, the filter will be wasted, and the filter effect will be deteriorated if the replacement is late, which will affect the output of the fresh air fan; 2. Add a pressure sensor around the filter , to detect the pressure difference that the filter is subjected to, and then send the pressure difference to the controller to remind the user to replace it; although this detection method is reliable, but because the cost of the pressure sensor is too high, it will indirectly increase production cost

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