| 摘要 |
A cleaning device is coupled to a fan used for creating air flow across ionizing electrodes. The cleaning device rotates with the propeller and includes a cover adapted for mounting on the propeller hub. A stand is attached to the cover and has a rod that is slidably installed into a hole in the stand. A brush and a weight are attached to the opposite ends of the rod, and a compression spring is disposed about the rod and positioned on the side of the stand opposite the weight. A counterweight assembly is also attached to the stand for dynamically balancing the cleaning device during a full cycle of operation. The counterweight assembly includes a counterweight and an extension spring that are slidably mounted about a rod attached to the cleaning assembly. When the fan is turned off or operates below the speed of normal operation of the ionizing device, the circle of rotation of the ends of the brush overlaps the circle formed by the emitter points of the discharge electrodes and makes possible a sweeping motion of the brush which dislodges the dirt and the dust from the emitter points of the electrodes. When the fan rotates with normal operating speed the brush assembly is fully inside the cover, and the weight and the counterweight rest next to the wall of the cover.
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