Electrostatic precipitator

Details Electrostatic precipitator Electrostatic precipitator

1996-06-05

1999-07-13

Chiesa, Richard L.

Gas separation: apparatus

Electric field separation apparatus

Including gas flow distribution means

55DIG38, 96 65, 96 98, 96100, B03C 306

Patent

active

059221119

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

1. Field of Invention
The present invention relates to an electrostatic precipitator. More particularly, it relates to an electrostatic precipitator for collecting a mist and the like produced when a coolant is dispersed in cutting operations of various machines such as lathes and cylindrical grinding plates.
2. Background Art
Generally, the housing of typical electrostatic precipitators for collecting a mist and the like has an upper inlet for introducing air into the housing and a lower outlet for discharging the air out of the housing. The inlet and the outlet are communicated with each other through cylindrical dust collection electrodes extending vertically within the housing. The air introduced into the housing through the inlet flows through the dust collection electrodes and is discharged from the housing through the outlet. A discharge electrode is provided within each dust collection electrode. When a voltage is applied between the dust collection electrodes and the discharge electrodes, a direct current electric field is developed therebetween. Fine particles such as those of the mist and the like in the air flowing through the dust collection electrodes are attracted to and adhere to the inner walls of the dust collection electrodes due to the influence of the direct current electric field. The fine particles are, therefore, removed from the air so that air containing fewer fine particles is discharged from the outlet.
Liquid droplets are formed when the mist adhering to the inner walls of the dust collection electrodes coalesces. The droplets then flow downward along the inner wall of each dust collection electrode due to their own weight and are drained off from the dust collection electrodes through their open bottom ends. The electrostatic precipitator thus constructed is mounted, for example, on a cutting machine and collects the mist produced thereby.
However, if the mist content of the air is high, such a conventional electrostatic precipitator is not sufficient to collect the mist while the air flows through the dust collection electrode. As such, the air may still have a significant amount of the mist when it is discharged from the outlet.
When a conventional electrostatic precipitator is mounted on a cutting machine, it may be horizontally mounted depending on the arrangement of the cutting machine. In such a case, the dust collection electrodes extend horizontally so that the droplets adhered to the inner walls of the dust collection electrodes may not be drained off from and accumulated within the dust collection electrodes.


SUMMARY OF THE INVENTION

Accordingly, it is a principal object of the present invention to provide an electrostatic precipitator that positively removes fine particles from air even if the amount of the fine particles in the gas is high.
It is another object of the present invention to provide an electrostatic precipitator that positively discharges fine particles adhering to the inner wall of a dust collection electrode from the interior of the dust collection electrode even if the dust collection electrode is arranged to extend horizontally.


DISCLOSURE OF THE INVENTION

Basically, the invention comprises an electrostatic precipitator for removing fine particles from gas. The precipitator has an inlet chamber for receiving gas containing fine particles. A discharge electrode and a dust collection electrode substantially surrounding the discharge electrode are provided such that an air space is defined between the dust collection electrode and the discharge electrode. The dust collection electrode further has an entrance opening and an exit opening such that gas is permitted to flow into the air space through the entrance opening from the inlet chamber and out of the air space through the exit opening. A voltage is provided between the discharge electrode and the dust collection electrode to create an electric field therebetween for electrostatically collecting fine particles from the gas in the airspace on the dust collection e

REFERENCES:
patent: 1325136 (1919-12-01), Bradley
patent: 1381719 (1921-06-01), McGee et al.
patent: 1430246 (1922-09-01), Meredith
patent: 2064960 (1936-12-01), Thorne
patent: 2853151 (1958-09-01), Guldemond
patent: 3668835 (1972-06-01), Vicard
patent: 3979189 (1976-09-01), Alskog
patent: 4289504 (1981-09-01), Scholes

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