US3820306A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrostatic precipitator employing dielectric grids
Assignee: Trane US Inc
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Filing: 1971-11-02
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Granted: 1974-06-28
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Expires: 1991-11-02
Abstract
Abstract Covers an electrical precipitator composed of a plurality of similar apertured plates, called ''''grids'''', which are vertically arranged so that particles of matter may be transmitted through the apertures of any or all of the grids. The grids may comprise two or more apertured metallic plates, between any two of which there may be one or more dielectric plates which are also apertures so that the particles of matter may also be transmitted therethrough. Such dielectric plates will receive induced potentials and hence engage in the process of precipitation of such particles. If a single apertured dielectric plate is arranged between two apertured metallic plates, it may be equally spaced from and between the two metallic plates. If two apertured dielectric plates are positioned between two apertured metallic plates, the two dielectric plates may be spaced from each other by a distance which is about equal to the spacing of either of the dielectric plates from the respective adjacent metallic plates.
Inventors
- 👤 J Vincent
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 05:15
CPC Classifications
B; B03; B03C; B03C3/00; B03C3/02; B03C3/04; B03C3/09
Claims Analysis
Total Claims: 26
Claim 1
Independent Claim
128 words
An electrostatic precipitator for precipitating charged particles conveyed by a fluid medium, comprising a pair of metallic plates each having substantial apertures therein through which the charged particles are transmitted, a dielectric plate having similar apertures which are aligned with the apertures of the metallic plates and interposed between and spaced from each of the metallic plates and insulated from the metallic plates, a source of voltage which is connected across the metallic plates to apply voltage directly to the metallic plates and to establish an electrostatic field between the metallic plates and to induce electrical charge on the opposite surfaces of the dielectric plate, whereby the charged particles may traverse the apertures of all three plants and may be attracted to and collected by all three plates.
Claim 2
Dependent Claim
128 words
An electrostatic precipitator for precipitating charged particles conveyed by a fluid medium, comprising a pair of metallic plates each having substantial apertures therein through which the charged particles are transmitted, a dielectric plate having similar apertures which are aligned with the apertures of the metallic plates and interposed between and spaced from each of the metallic plates and insulated from the metallic plates, a source of voltage which is connected across the metallic plates to apply voltage directly to the metallic plates and to establish an electrostatic field between the metallic plates and to induce electrical charge on the opposite surfaces of the dielectric plate, whereby the charged particles may traverse the apertures of all three plants and may be attracted to and collected by all three plates.
Claim 3
Dependent Claim
88 words
An electrostatic precipitator according to claim 1 in which the apertures of the metallic plates and the apertures of the dielectric plate occupy about 60 to 70 percent of the effective area of each of the plates and the plates are spaced from each other by a predetermined distance so that the particulate matter will be vorticized in the wake of its passage through each of the plate apertures, whereby the particulate matter will be slowed up to facilitate the attraction of the particulate matter by said plates.
Claim 4
Dependent Claim
98 words
An electrostatic precipitator comprising three parallel plates which are positioned transverse to the path of charged particles and are parallel to and spaced from each other and have substantially aligned apertures so that particulate matter may be transmitted through the apertures of all of said plates, a source of voltage connected to the outer plates to establish an electrostatic non-ionizing field therebetween, the intermediate plate being made of dielectric material and being disconnected from the source of voltage so as to receive an induced voltage, all of the plates being collectors of particulate matter transmitted through the apertures.
Claim 5
Dependent Claim
98 words
An electrostatic precipitator comprising three parallel plates which are positioned transverse to the path of charged particles and are parallel to and spaced from each other and have substantially aligned apertures so that particulate matter may be transmitted through the apertures of all of said plates, a source of voltage connected to the outer plates to establish an electrostatic non-ionizing field therebetween, the intermediate plate being made of dielectric material and being disconnected from the source of voltage so as to receive an induced voltage, all of the plates being collectors of particulate matter transmitted through the apertures.
Claim 6
Dependent Claim
64 words
An electrostatic precipitator according to claim 3 in which the apertures occupy more than half of the active collecting surface of the respective plates and spaced from each other by a predetermined distance so that particulate matter will be vorticized in the wake of its passage through any aperture so that it may be slowed down and collected on the surface of said plates.
Claim 7
Dependent Claim
106 words
An electrostatic precipitator comprising a conventional precipitating structure, and an add-on precipitating structure coupled to the conventional structure, the add-on structure including two parallel apertured metallic plates between which a voltage is directly applied to produce a non-corona field therebetween and an intermediate substantially identical parallel apertured plate made of dielectric material which is spaced from and insulated from the metallic plates to receive an induced voltage due to its position between the metallic plates, so that ionized particulate matter received from the conventional precipitator may be transmitted through the apertures of all of said plates and collected on the surfaces of all of said plates.
Claim 8
Dependent Claim
106 words
An electrostatic precipitator comprising a conventional precipitating structure, and an add-on precipitating structure coupled to the conventional structure, the add-on structure including two parallel apertured metallic plates between which a voltage is directly applied to produce a non-corona field therebetween and an intermediate substantially identical parallel apertured plate made of dielectric material which is spaced from and insulated from the metallic plates to receive an induced voltage due to its position between the metallic plates, so that ionized particulate matter received from the conventional precipitator may be transmitted through the apertures of all of said plates and collected on the surfaces of all of said plates.
Claim 9
Dependent Claim
63 words
An electrostatic precipitator according to claim 5 in which the plates are spaced from each other by at least a predetermined minimal distance and the apertures occupy at least 60 percent of the effective surface areas of the plates, whereby particulate matter will be vorticized and slowed down so as to be attracted by and collectable on the charge surfaces of said plates.
Claim 10
Dependent Claim
145 words
An electrostatic precipitator for collecting charged particulate matter, comprising a first plurality of interconnected metallic plates, a second plurality of interconnected metallic plates, a source of voltage connected between the first and second pluralities of plates to establish a non-corona electrostatic field therebetween, and a plurality of dielectric plates so arranged that one of said dielectric plates is interposed between one of the first plurality of metallic plates and one of the second plurality of metallic plates so that an individual dielectric plate is interposed between two metallic plates of said two pluralities of plates to receive an induced electrostatic charge due to its interposition, all of said metallic and dielectric plates being positioned parallel to each other and having substantially aligned apertures so that charged particulate matter may be borne through the apertures of said metallic and dielectric plates and vorticized and collected thereon.
Claim 11
Dependent Claim
145 words
An electrostatic precipitator for collecting charged particulate matter, comprising a first plurality of interconnected metallic plates, a second plurality of interconnected metallic plates, a source of voltage connected between the first and second pluralities of plates to establish a non-corona electrostatic field therebetween, and a plurality of dielectric plates so arranged that one of said dielectric plates is interposed between one of the first plurality of metallic plates and one of the second plurality of metallic plates so that an individual dielectric plate is interposed between two metallic plates of said two pluralities of plates to receive an induced electrostatic charge due to its interposition, all of said metallic and dielectric plates being positioned parallel to each other and having substantially aligned apertures so that charged particulate matter may be borne through the apertures of said metallic and dielectric plates and vorticized and collected thereon.
Claim 12
Dependent Claim
18 words
An electrostatic precipitator according to claim 7 in which the source of voltage is of the d.c. type.
Claim 13
Dependent Claim
18 words
An electrostatic precipitator according to claim 7 in which the source of voltage is of thE alternating type.
Claim 14
Dependent Claim
41 words
An electrostatic precipitator according to claim 7 in which the apertures of the metallic and dielectric plates are circular and aligned so that they are optically transparent to permit the free flow of the particulate matter therethrough without substantial pressure loss.
Claim 15
Dependent Claim
18 words
An electrostatic precipitator according to claim 10 in which the dielectric plate is made of a plastic material.
Claim 16
Dependent Claim
16 words
An electrostatic precipitator according to claim 10 in which the dielectric plate is made of fiberglass.
Claim 17
Dependent Claim
101 words
An electrostatic precipitator for improving an existing precipitator for removing charged particles, comprising a pair of apertured metallic plates, an apertured dielectric plate interposed between and insulated from the metallic plates, and means for applying a voltage between the metallic plates so as to induce a voltage on the interposed dielectric plate, the apertures of all of the plates being of substantially the same size and aligned with each other and the spacings between said plates being substantially uniform so that charged particles will be vorticized as they exit an aperture and slowed up to facilitate their attraction by said plates.
Claim 18
Dependent Claim
101 words
An electrostatic precipitator for improving an existing precipitator for removing charged particles, comprising a pair of apertured metallic plates, an apertured dielectric plate interposed between and insulated from the metallic plates, and means for applying a voltage between the metallic plates so as to induce a voltage on the interposed dielectric plate, the apertures of all of the plates being of substantially the same size and aligned with each other and the spacings between said plates being substantially uniform so that charged particles will be vorticized as they exit an aperture and slowed up to facilitate their attraction by said plates.
Claim 19
Dependent Claim
24 words
An electrostatic precipitator according to claim 13 in which a plurality of spaced substantially identical apertured dielectric plates are inserted between the metallic plates.
Claim 20
Dependent Claim
132 words
An electrostatic precipitator comprising a plurality of apertured metallic plates spaced from each other, a plurality of apertured dielectric plates spaced from each other and interspersed between said metallic plates so that each dielectric plate is interposed between a pair of adjacent metallic plates, a source of voltage having one terminal connected to certain of said metallic plates and its other terminal connected to the remaining metallic plates so that opposing voltages appear on adjacent metallic plates but no voltage is directly applied to the dielectric plates and yet a voltage is induced upon each dielectric plate, the apertures of all said metallic and dielectric plates being substantially coaxially aligned with each other so that particulate matter traversing said apertures may be attracted to and collected by said metallic and dielectric plates.
Claim 21
Dependent Claim
132 words
An electrostatic precipitator comprising a plurality of apertured metallic plates spaced from each other, a plurality of apertured dielectric plates spaced from each other and interspersed between said metallic plates so that each dielectric plate is interposed between a pair of adjacent metallic plates, a source of voltage having one terminal connected to certain of said metallic plates and its other terminal connected to the remaining metallic plates so that opposing voltages appear on adjacent metallic plates but no voltage is directly applied to the dielectric plates and yet a voltage is induced upon each dielectric plate, the apertures of all said metallic and dielectric plates being substantially coaxially aligned with each other so that particulate matter traversing said apertures may be attracted to and collected by said metallic and dielectric plates.
Claim 22
Dependent Claim
27 words
An electrostatic precipitator according to claim 15, including a source of pressurized air for moving the particulate matter through the apertures of said metallic and dielectric plates.
Claim 23
Dependent Claim
32 words
An electrostatic precipitator according to claim 16 in which the apertures of the metallic and dielectric plates occupy 60 to 70 percent of the total effective area of each of said plates.
Claim 24
Dependent Claim
118 words
An electrostatic precipitator including a pair of spaced metallic plates, a dielectric plate interposed between the metallic plates, a source of voltage connected to the metallic plates but are not connected to the dielectric plate, said source of voltage inducing an electrical charge of a substantial voltage on the dielectric plate, said metallic plates and said dielectric plate each having a plurality of apertures, all of which are substantially coaxially aligned with each other to provide direct through paths through said apertures, particulate matter being vorticized in traversing the apertures of said metallic and dielectric plates and slowed down so as to be attracted by and collected on the surfaces of all of said metallic and dielectric plates.
Claim 25
Dependent Claim
118 words
An electrostatic precipitator including a pair of spaced metallic plates, a dielectric plate interposed between the metallic plates, a source of voltage connected to the metallic plates but are not connected to the dielectric plate, said source of voltage inducing an electrical charge of a substantial voltage on the dielectric plate, said metallic plates and said dielectric plate each having a plurality of apertures, all of which are substantially coaxially aligned with each other to provide direct through paths through said apertures, particulate matter being vorticized in traversing the apertures of said metallic and dielectric plates and slowed down so as to be attracted by and collected on the surfaces of all of said metallic and dielectric plates.
Claim 26
Dependent Claim
34 words
An electrostatic precipitator according to claim 18 in which the sum total of the areas of said apertures of each plate occupy at least 60 percent of the total active surfaces of said plates.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-06-27 | 1977-12-27 | 1978-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-27 | 1981-12-27 | 1982-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-27 | 1985-12-27 | 1986-06-28 | $7700.00 | Window Closed / Lapsed |