Device for air cleaning

Abstract

An air cleaning device (10) has a particle charging zone (12) comprising a conducting sheet (16) having a plurality of apertures (18), through which air can be passed, and a plurality of corona emitters (22) each associated with an aperture, and a filter (14).

Description

technical field [0001] The present invention relates to improvements in air cleaning devices and to air cleaning devices. Background technique [0002] The usual method of purifying particulate matter from the air is to pass the air over a particle-charged array of corona wires and grounded plates and subsequently deposit the charged particles in the electric field, usually onto an array of metal plates alternately placed at high and ground potentials . Such devices are commonly referred to as electrostatic precipitators. [0003] Conventional electrostatic precipitators have many disadvantages. For high efficiency, the corona charging wires must be placed carefully and centrally to ensure uniform charging of the particles. These wires quickly collect dust on the wire surface, reducing the corona charging current and creating an uneven corona, resulting in reduced efficiency. When cleaning corona wires, they often bend or move out of alignment due to their brittle nature...

AI Technical Summary

Problems solved by technology

When done correctly, the corona wire achieves good initial charging along its length, but not at the ends where it must be attached to the support frame

The air flowing over the end of the wire is not effectively charged and this leads to a reduction in overall efficiency

Also, for high efficiency, relatively large currents are required to be supplied to the corona wires, resulting in high ozone levels and costly power supplies

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