US3853750A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and device for the collection of particles in a gas with particle-size separation
Assignee: Commissariat à l'Énergie Atomique et Aux Énergies Alternatives
•
Filing: 1972-12-19
•
Granted: 1974-12-10
•
Expires: 1992-12-19
Abstract
Abstract Particles suspended in polluted gas or atmospheric air to be analyzed are collected and separated according to their effective size by means of an electrostatic device comprising an inlet duct for the supply of ''''clean'''' gas, means for damping-out turbulent motion within said duct, and a conduit comprising at least one ionizer through which the polluted gas or air is injected into the clean gas stream. The charged particles are collected as the stream flows between two conductive plates which are substantially parallel to each other and between which is applied a direct-current potential difference.
Inventors
- 👤 R Volsy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 21:54
CPC Classifications
B; B03; B03C; B03C3/00; B03C3/02; B03C3/04; B03C3/12; B03C3/019; B03C3/34; B03C3/38; B03C3/383; Y; Y02; Y02A; Y02A50/00; Y02A50/20; Y02A50/2351; Y10; Y10S; Y10S55/00; Y10S55/14; Y10S55/29
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
78 words
A method for the collection of particles in a polluted gas with particlar-size separation comprising the steps of charging the suspended particles of polluted gas in an ionizer, injecting into a gas stream in non-turbulent regime a flow of said charged polluted gas and collecting said charged particles by passing said gas stream between two substantially parallel conductive plates parallel to the axis of propagation of the gas stream and applying a direct-current potential difference between said plates.
Claim 2
Independent Claim
78 words
A method for the collection of particles in a polluted gas with particlar-size separation comprising the steps of charging the suspended particles of polluted gas in an ionizer, injecting into a gas stream in non-turbulent regime a flow of said charged polluted gas and collecting said charged particles by passing said gas stream between two substantially parallel conductive plates parallel to the axis of propagation of the gas stream and applying a direct-current potential difference between said plates.
Claim 3
Dependent Claim
36 words
A method according to claim 1, including the steps after the gas stream has passed between said conductive plates, of again charging the particles remaining in said stream in a second ionizer and precipitating the particles.
Claim 4
Dependent Claim
22 words
A method according to claim 1 including the steps of automatically weighing the deposits as collected and corresponding to each particle size.
Claim 5
Independent Claim
150 words
A device for the collection of particles in a polluted gas with particle size separations comprising: a conduit for the admission of polluted gas; at least one ionizer in said conduit; a duct of larger cross-sectional area than said conduit, said duct having the shape of an aerodynamic converging cone for the supply of a gas stream, means in said duct for damping-out the turbulence, said conduit opening into said means, an orifice for said conduit oriented in the same direction as the downstream portion of said converging cone; a tubular chamber having the same longitudinal axis as said duct and connected at one end to the downstream portion of said converging cone, at least two conductive surfaces in said chamber extending in the longitudinal direction of said chamber, means for applying a direct-current potential difference between said surfaces; and means for circulating the two gas streams between said surfaces.
Claim 6
Independent Claim
150 words
A device for the collection of particles in a polluted gas with particle size separations comprising: a conduit for the admission of polluted gas; at least one ionizer in said conduit; a duct of larger cross-sectional area than said conduit, said duct having the shape of an aerodynamic converging cone for the supply of a gas stream, means in said duct for damping-out the turbulence, said conduit opening into said means, an orifice for said conduit oriented in the same direction as the downstream portion of said converging cone; a tubular chamber having the same longitudinal axis as said duct and connected at one end to the downstream portion of said converging cone, at least two conductive surfaces in said chamber extending in the longitudinal direction of said chamber, means for applying a direct-current potential difference between said surfaces; and means for circulating the two gas streams between said surfaces.
Claim 7
Dependent Claim
37 words
A device according to claim 4, including a suction means connected to said chamber, and means for regulating the suction power of said suction means to produce within said chamber a flow having small and damped-out turbulence.
Claim 8
Dependent Claim
142 words
A device according to claim 4 wherein each ionizer in the conduit for the admission of polluted gas has three electrodes: the first electrode having conductive surface placed longitudinally within said conduit and connected to an alternating-current voltage source; the second electrode having grid, a plate covering said grid, a slot in said plate, the generating-lines of said surface and of said plate being substantially parallel, said grid and said plate being disposed longitudinally within said conduit and maintained at a direct-current potential; and the third electrode being a wire, a cavity having an opening opposite said slot, said cavity, receiving said wire, means for maintaining said wire at a direct-current potential different from that of said grid, said grid and said plate being disposed over said opening and connecting sAid cavity to said conduit and through said grid and said slot.
Claim 9
Dependent Claim
29 words
A device according to claim 4 wherein said conduit for the admission of polluted gas is disposed coaxial with the axis of the converging cone of said supply duct.
Claim 10
Dependent Claim
22 words
A device according to claim 4 wherein said conduit for the admission of polluted gas is adjacent a wall of said chamber.
Claim 11
Dependent Claim
13 words
A device according to claim 4 wherein said ionizer comprises a radioactive source.
Claim 12
Dependent Claim
28 words
A device according to claim 4 including means for automatic weighing of the deposits of different particle size comprising piezoelectric strips operatively associated with said collecting conductive surfaces.
Claim 13
Dependent Claim
21 words
A device according to claim 4 including between the chamber and the suction means an ionizer to precipitate the unseparated particles.
Claim 14
Dependent Claim
17 words
A device according to claim 6, said ionizer to precipitate the uncollected particles comprising a radioactive source.
References Cited (Backward Citations)
US2097233A
Cited
DE833798C
Cited
DE833799C
Cited
US2868318A
Cited
US3149936A
Cited
US3331192A
Cited
US3413545A
Cited
US3520172A
Cited
US3526828A
Cited
US3540851A
Cited
US3516608A
Cited
US3561253A
Cited
US3656440A
Cited
US3718029A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-12-09 | 1978-06-10 | 1978-12-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-09 | 1982-06-10 | 1982-12-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-09 | 1986-06-10 | 1986-12-10 | $7700.00 | Window Closed / Lapsed |