Patent ID: 7297185

Claim:
An electrostatic dust precipitator comprising: a housing including an internally formed air path communicating between an inlet for drawing polluted air containing fine particulate and an outlet for emitting clean air purified by removing the fine particulate; an airstream generating means that causes generation of an airstream in the air path, that draws the polluted air, and that emits the clean air; a discharging means that is provided in the air path and that charges the fine particulate contained in the polluted air by using a corona discharge; a collecting means that is provided in the air path and that collects the fine particulate, which has been charged by the discharging means, by using a coulomb force; and a discharge voltage supply means that is connected to the discharging means and that supplies a discharge voltage capable of generating the corona discharge, wherein the collecting means is provided downstream of the discharging means in the air path and includes: a charging unit that includes a plurality of charging plates fitted in a state where charge surfaces thereof are opposite to one another and that, by using the coulomb force, causes the fine particulate charged by the discharging means to repel from the charge surfaces; an attracting unit that includes an attraction shaft and a plurality of attracting plates, which each have a substantially disc shape, which are each inserted between mutually adjacent ones of the charging plates, and which each have an attracting surface located close to each one of the charge surfaces, and that attracts the charged fine particulate to the attracting surface by using the coulomb force; an attraction-shaft bearing unit that rotatably journals the attraction shaft of the attracting unit; and attracting-plate rotating means that is connected to the attraction shaft, thereby to axially rotate the attraction shaft and to rotate the attracting plates.