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US3852178A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrostatic filtering for cleaning dielectric fluids
Assignee: Individual
•
Filing: 1970-08-27
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Granted: 1974-12-03
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Expires: 1990-08-27
Abstract
Abstract Method of separating particles suspended in a dielectric field stream by passing the stream through a high voltage unidirectional field in a direction transverse thereto under turbulent flow conditions to effect contact charging of the particles at a charged surface. The fluid stream is then slowed to laminar flow conditions and the charged particles are collected on a stationary structure in a unidirectional field.
Inventors
- 👤 E Griswold
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 05:59
CPC Classifications
B; B01; B01D; B01D35/00; B01D35/06; B03; B03C; B03C5/00; B03C5/02; B03C5/022; B03C5/024
Claims Analysis
Total Claims: 29
Claim 1
Independent Claim
97 words
THE METHOD OF SEPARATING PARTICLES SUSPENDED IN A DIELECTRIC FLUID STREAM THAT INCLUDES THE STEPS OF: MAINTAINING A SUBSTANTIALLY UNIFORM, HIGH VOLTAGE UNIDIRECTIONAL ELECTRIC FIELD, FLOWING THE FLUID STREAM THROUGH THE ELECTRIC FIELD IN A DIRECTION GENERALLY TRANSVERSELY TO THE FIELD; DIRECTLY IMPACTING THE PARTICLES ONTO A SURFACE BY FLOWING THE FLUID STREAM AT A SUFFICIENTLY HIGH VELOCITY UNDER TURBULENT FLOW CONDITIONS TO EFFECT CONTACT CHARGING OF THE PARTICLES AT THE SURFACE FOLLOWED BY SEPARATION OF THE CHARGED PARTICLES FROM SAID SURFACE; AND COLLECTING THE CHARGED AND SEPARATED PARTICLES ON STATIONARY STRUCTURE IN A UNDIRECTIONAL ELECTRIC FIELD.
Claim 2
Independent Claim
97 words
THE METHOD OF SEPARATING PARTICLES SUSPENDED IN A DIELECTRIC FLUID STREAM THAT INCLUDES THE STEPS OF: MAINTAINING A SUBSTANTIALLY UNIFORM, HIGH VOLTAGE UNIDIRECTIONAL ELECTRIC FIELD, FLOWING THE FLUID STREAM THROUGH THE ELECTRIC FIELD IN A DIRECTION GENERALLY TRANSVERSELY TO THE FIELD; DIRECTLY IMPACTING THE PARTICLES ONTO A SURFACE BY FLOWING THE FLUID STREAM AT A SUFFICIENTLY HIGH VELOCITY UNDER TURBULENT FLOW CONDITIONS TO EFFECT CONTACT CHARGING OF THE PARTICLES AT THE SURFACE FOLLOWED BY SEPARATION OF THE CHARGED PARTICLES FROM SAID SURFACE; AND COLLECTING THE CHARGED AND SEPARATED PARTICLES ON STATIONARY STRUCTURE IN A UNDIRECTIONAL ELECTRIC FIELD.
Claim 3
Dependent Claim
26 words
The method of claim 1 wherein said stationary structure is porous, and said collecting step is carried out to collect the particles interiorly of said structure.
Claim 4
Dependent Claim
37 words
The method of claim 1 wherein said stream flow before particle impacting is turbulent, and including the step of altering the flow subsequent to said particle impacting to produce laminar stream flow prior to said collecting step.
Claim 5
Dependent Claim
30 words
The method of claim 2 wherein said stream flow before particle impacting is turbulent, and including the step of altering the flow subsequent to said particle impacting to produce laminar.
Claim 6
Independent Claim
104 words
The method of separating particles suspended in a dielectric fluid stream that includes the steps of: maintaining a substantially uniform, unidirectional electric field, flowing the fluid stream through the electric field in a direction generally transversely to the field; directly impacting the particles onto a surface in the field by introduCing the fluid stream into said electric field at a sufficiently high velocity to create turbulent flow conditions within said field thereby to effect contact charging of the particles at said surface followed by separation of the particles from said surface; and collecting the charged particles on stationary structure in a unidirectional electric field.
Claim 7
Independent Claim
104 words
The method of separating particles suspended in a dielectric fluid stream that includes the steps of: maintaining a substantially uniform, unidirectional electric field, flowing the fluid stream through the electric field in a direction generally transversely to the field; directly impacting the particles onto a surface in the field by introduCing the fluid stream into said electric field at a sufficiently high velocity to create turbulent flow conditions within said field thereby to effect contact charging of the particles at said surface followed by separation of the particles from said surface; and collecting the charged particles on stationary structure in a unidirectional electric field.
Claim 8
Independent Claim
90 words
The method of separating solid particles suspended in a dielectric fluid stream, that includes a. flowing the fluid stream through a substantially uniform electric field, b. directly contacting the particles in the flowing stream under turbulent flow conditions onto a surface in the field to effect contact electrical charging of the particles followed by separation of the particles from said surface and displacement of the charged particles by said stream, and c. collecting the charged and separated particles on stationary structure in an electrical field and spaced from said surface.
Claim 9
Independent Claim
90 words
The method of separating solid particles suspended in a dielectric fluid stream, that includes a. flowing the fluid stream through a substantially uniform electric field, b. directly contacting the particles in the flowing stream under turbulent flow conditions onto a surface in the field to effect contact electrical charging of the particles followed by separation of the particles from said surface and displacement of the charged particles by said stream, and c. collecting the charged and separated particles on stationary structure in an electrical field and spaced from said surface.
Claim 10
Dependent Claim
18 words
The method of claim 6 wherein said direct contacting is effected by impacting the particles against said surface.
Claim 11
Dependent Claim
36 words
The method of claim 7 wherein said impacting is effected by creating stream turbulent flow forcibly displacing the particles onto said surface and thereafter displacing the charged particles away from said surface toward said stationary structure.
Claim 12
Dependent Claim
33 words
The method of claim 8 including the step of confining said turbulent flow to a zone between generally parallel planar boundaries, and directing said field through said zone generally normal to said boundaries.
Claim 13
Independent Claim
148 words
The method of removing particles suspended in a stream of a dielectric fluid in a porous region laterally bounded by spaced electrodes that includes the steps of: flowing the stream of fluid with particles suspended therein along a path within said porous region; maintaining a high-intensity unidirectional electrostatic field across the fluid path between the laterally spaced electrodes; directly contacting the particles in the flowing stream under turbulent flow conditions onto a surface to effect contact electrical charging of the particles followed by separation of the particles from said surface and displacement of the charged particles by said stream, effecting a change in velocity of the fluid stream by controlling the net cross-sectional area of the porous region available to the fluid stream in said field wherein the particles migrate toward a boundary of the region; and receiving the migrating particles on stationary structure defining the porous region.
Claim 14
Independent Claim
148 words
The method of removing particles suspended in a stream of a dielectric fluid in a porous region laterally bounded by spaced electrodes that includes the steps of: flowing the stream of fluid with particles suspended therein along a path within said porous region; maintaining a high-intensity unidirectional electrostatic field across the fluid path between the laterally spaced electrodes; directly contacting the particles in the flowing stream under turbulent flow conditions onto a surface to effect contact electrical charging of the particles followed by separation of the particles from said surface and displacement of the charged particles by said stream, effecting a change in velocity of the fluid stream by controlling the net cross-sectional area of the porous region available to the fluid stream in said field wherein the particles migrate toward a boundary of the region; and receiving the migrating particles on stationary structure defining the porous region.
Claim 15
Dependent Claim
43 words
The method of claim 10 including the step of initially flowing the stream within a zone from which the stream flows to said porous region, and maintaining a high-intensity charging field in said zone to precharge the particles in the stream flowing therein.
Claim 16
Dependent Claim
30 words
The method of claim 11 including the step of mechanically separating particles from the stream subsequent to flow thereof in said zone and prior to flow thereof in said region.
Claim 17
Dependent Claim
60 words
The method of claim 11 wherein a plurality of said bounded regions are formed to pass the stream therethrough from said zone with each region passing a portion of the stream and said portions passing through the regions in generally parallel relation, sand the maintenance of the electrostatic field being carried out to direct the field oppositely in successive regions.
Claim 18
Dependent Claim
38 words
The method of claim 10 in which the stream velocity is reduced as it flows along the path through the field by increasing the net cross-sectional area of the porous region in the direction of fluid stream flow.
Claim 19
Dependent Claim
49 words
The method of claim 10 wherein said change of velocity of the stream is effected by restricting the flow entering said region to produce turbulence thereof, and thereafter diffusing the stream flow through porous dielectric media operating to reduce the flow velocity to establish laminar flow in said region.
Claim 20
Dependent Claim
51 words
The method of claim 15 wherein particles migrating to said boundary tend to form agglomerates carried by the flow out of the porous region, and including the step of mechanically separating agglomerates from the stream at the low velocity of fluid flow proximate the downstream boundary of said porous dielectric media.
Claim 21
Independent Claim
122 words
The method of removing particles suspended in a dielectric fluid stream that includes the steps of: flowing the stream along a generally longitudinal path within an open laterally bounded zone totally bridged by said fluid stream and totally laterally enveloped by a depth type porous medium; maintaining a high-intensity unidirectional charging field directed generally radially in said zone and extending to a porous outer lateral boundary thereof, directly contacting the particles in the flowing stream under turbulent flow conditions onto a surface in the field to effect contact electrical charging of the particles followed by separation of the particles from said surface and displacement of the charged particles by said stream; and receiving the charged particles at and within said porous boundary.
Claim 22
Independent Claim
122 words
The method of removing particles suspended in a dielectric fluid stream that includes the steps of: flowing the stream along a generally longitudinal path within an open laterally bounded zone totally bridged by said fluid stream and totally laterally enveloped by a depth type porous medium; maintaining a high-intensity unidirectional charging field directed generally radially in said zone and extending to a porous outer lateral boundary thereof, directly contacting the particles in the flowing stream under turbulent flow conditions onto a surface in the field to effect contact electrical charging of the particles followed by separation of the particles from said surface and displacement of the charged particles by said stream; and receiving the charged particles at and within said porous boundary.
Claim 23
Dependent Claim
28 words
The method of claim 17 including the step of effecting progressively along said longitudinal path a lateral flow of the stream to and through said porous lateral boundary.
Claim 24
Dependent Claim
20 words
The method of claim 18 including the step of mechanically separating particles from the stream proximate said porous lateral boundary.
Claim 25
Dependent Claim
82 words
The method of claim 18 wherein said lateral flow of the stream carries certain particles through said porous boundary, and including the steps of subsequently flowing the stream away from said zone within a laterally bounded, porous dielectric region, maintaining a high-intensity electrostatic field directed generally transversely to the direction of fluid flow in said region and extending to a boundary thereof to cause migration of the particles toward and to said lateral boundary, and collecting the migrating particles within said region.
Claim 26
Dependent Claim
27 words
The method of claim 20 including the step of reducing the stream flow velocity by increasing the cross-sectional area of said region available to the fluid stream.
Claim 27
Dependent Claim
25 words
The method of claim 21 including the step of mechanically separating particles from the flow proximate to flow passage through the said porous dielectric region.
Claim 28
Independent Claim
178 words
The method of removing particles suspended in a stream of a dielectric fluid in a porous region laterally bounded by spaced electrodes, that includes the steps of: flowing the stream of fluid with particles suspended therein along a path within said porous region; establishing a plurality of localized charging fields between the spaced electrodes bounding the stream path at said porous region and wherein the suspended particles are charged; maintaining a high-intensity unidirectional electrostatic field across the fluid path between the laterally spaced electrodes; directly contacting the particles in the flowing stream under turbulent flow conditions onto a surface in the field to effect contact electrical charging of the particles followed by separation of the particles from said surface and displacement of the charged particles by said stream; effecting a change in velocity of the fluid stream by controlling the net cross-sectional area of the porous region available to the fluid stream in said field wherein the suspended particles migrate toward a boundary of the region; and receiving the migrating particles on stationary structure defining the porous region.
Claim 29
Independent Claim
178 words
The method of removing particles suspended in a stream of a dielectric fluid in a porous region laterally bounded by spaced electrodes, that includes the steps of: flowing the stream of fluid with particles suspended therein along a path within said porous region; establishing a plurality of localized charging fields between the spaced electrodes bounding the stream path at said porous region and wherein the suspended particles are charged; maintaining a high-intensity unidirectional electrostatic field across the fluid path between the laterally spaced electrodes; directly contacting the particles in the flowing stream under turbulent flow conditions onto a surface in the field to effect contact electrical charging of the particles followed by separation of the particles from said surface and displacement of the charged particles by said stream; effecting a change in velocity of the fluid stream by controlling the net cross-sectional area of the porous region available to the fluid stream in said field wherein the suspended particles migrate toward a boundary of the region; and receiving the migrating particles on stationary structure defining the porous region.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-12-02 | 1978-06-03 | 1978-12-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-02 | 1982-06-03 | 1982-12-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-02 | 1986-06-03 | 1986-12-03 | $7700.00 | Window Closed / Lapsed |