Electric dust collector

An electric dust collector for collecting dust particles contained in gas with an electrostatic force, the electric dust collector comprising:

• a casing through which the gas flows;
• discharge electrodes arranged in the casing;
• a dust collecting electrode arranged in the casing between support frames provided at both ends in a longitudinal direction of the casing and formed into boxes with one end having an outlet, the dust collecting electrode at least partially made of metal mesh filter;
• and
• a voltage power applying unit for applying a driving voltage between the discharge electrodes and the dust collecting electrodes, wherein
• the dust collecting electrode controls a flow of the gas in the casing so that the gas is discharged to the outside of the dust collecting electrode through the outlet, after the gas to be collected in the casing flows into the dust collecting electrodes through the mesh filter,
• the discharge electrode is arranged to be opposed to the mesh filter and to extend in a flow direction of the gas that flows between the discharge electrode and the mesh filter,
• a plurality of discharge wire support portions that support discharge wires are arranged at the discharge electrodes, respectively, in the flow direction of the gas, and
• the number of the discharge wires arranged at the plurality of discharge wire support portions, respectively, is gradually decreased from the discharge wire support portion located on an upstream side in the flow direction of the gas toward the discharge wire support portions located on a downstream side in the flow direction of the gas.