Electrostatic filter having insulated electrodes
AssigneeAirinspace B.V.
InventorsVance Bergeron, Laurent Adrien Fullana
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Abstract
In various aspects of the invention, electrostatic filters having insulated electrodes are described. In such embodiments, care is taken to prevent the accumulation of opposing charges on the insulation, which, over time, would serve to significantly degrade the strength of the electrostatic field created in the dielectric, and thus reduce the performance of the electrostatic filter. A variety of mechanisms are described for mitigating the opposing charge buildup problem.
Claims11
An electrostatic filter suitable for collecting aerosol particulates carried in a fluid stream passing through the electrostatic filter, the electrostatic filter comprising:
- a first porous electrode wherein the first electrode has a core formed from a conductive material, an insulation layer that electrically insulates the core, and a charge distribution conductor that is isolated from the core by the insulation layer;
- a second porous electrode spaced apart from the first electrode;
- a porous dielectric positioned between the first and second electrodes and arranged such that in operation the fluid steam passes through the electrodes and the dielectric;
- and
- a charge source in communication with the conductor whereby in operation a first potential having a first polarity may be applied to the first porous electrode and the charge source at least periodically applies charges having the same polarity as the first electrode to the conductor in order to help neutralize opposing charges that seek to accumulate on the insulation layer of the first electrode.
An electrostatic filter comprising:
- a first insulated electrode having a core and a promiscuous insulation layer;
- a second insulated electrode spaced apart from the first electrode;
- and
- a dielectric positioned between the first and second electrodes and arranged such that in operation the fluid steam passes through the electrodes and the dielectric wherein the promiscuous insulation layer is arranged to electrically insulate the first electrode against shorting in normal operational conditions, but allows opposing charges that seek to accumulate on the first electrode during operation to migrate through the insulation layer to the core such that during operation, opposing charges do not accumulate sufficiently on the first electrode to significantly degrade a field induced in the dielectric by the first and second electrodes.
Dependencies are inferred from the claim text.