Patent US1795804A successfully refreshed from Google Patents.
US3843101A
Expired / Lapsed
US
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Flotation machine and impeller therefor
Assignee: GALIGHER COMPANY
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Filing: 1972-10-30
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Granted: 1974-10-22
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Expires: 1992-10-30
Abstract
Abstract An impeller for a flotation machine having a circular lower plate with a central hole for supplying air through a hollow shaft to the underside, and a circular upper plate having a larger central hole and sloping downwardly toward the outside, together with a series of radial, upright vanes between the plates which are thicker at their outer edges than at their inner edges, both of which are rounded, and a series of shorter, radial fingers depending from the periphery of the lower plate, also thinner at their inner rounded edges and thicker at their outer rounded edges. This impeller is utilized with a stabilizer including outwardly extending vanes which are thicker at their inner rounded edges and thinner at their outer edges. The vanes and fingers include central metal plates reinforced at their outer edges by rods, with the vane plates and vane rods being welded between the impeller plates and the finger plates and finger rods being welded to the lower side of the under plate, to form a skeleton. The impeller skeleton may be covered with rubber, which may be formed to provide the thickness and rounded edges of the vanes and fingers. Also, the stabilizer vanes may be formed of center plates welded to a support bar structure extending around either the outside of the vanes or disposed angularly of the lower outer corner thereof. The stabilizer vanes and support bars may be covered with rubber, which may be molded to provide the desired rounded inside edge and variations in thickness. Both the stabilizer vanes and the impeller are spaced above the bottom of the tank of the flotation machine, so that a recirculation of pulp around and above the impeller between the stabilizer vanes is obtained, as well as an outward discharge of pulp by the depending fingers into the spaces between the stabilizer vanes. Not only is the efficiency increased, but also the problem of ''''sanding up'''' in the bottom of the tank is overcome.
Inventors
- 👤 C Green
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 08:48
CPC Classifications
B; B03; B03D; B03D1/00; B03D1/14; B03D1/16; B03D1/20; B01; B01F; B01F27/00; B01F27/05; B01F27/051; B01F27/053; B01F27/11; B01F27/111; B01F27/80; B01F27/86; B03D1/1493; C; C02; C02F; C02F3/00; C02F3/02; C02F3/12; C02F3/20; C02F3/205; B03D1/02; B03D1/028; Y; Y02; Y02W; Y02W10/00; Y02W10/10
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
141 words
A rotatable impeller for a flotation machine, comprising: a circular lower plate; a circular upper plate concentric with and spaced from said lower plate, said upper plate having a circular central opening therein; a series of vanes extending generally radially and disposed between said upper and lower plates, said vanes being constructed and arranged to pump pulp and the like from said central opening of said upper plate and discharge the same from the periphery of the space between said plates; and a series of fingers spaced around the periphery of said lower plate and depending thErefrom, said depending fingers being equally spaced about the periphery of the underside of said lower plate, having a radial length less than the radial length of said vanes and having a lateral thickness adjacent the outer edge greater than adjacent the inner edge thereof.
Claim 2
Dependent Claim
141 words
A rotatable impeller for a flotation machine, comprising: a circular lower plate; a circular upper plate concentric with and spaced from said lower plate, said upper plate having a circular central opening therein; a series of vanes extending generally radially and disposed between said upper and lower plates, said vanes being constructed and arranged to pump pulp and the like from said central opening of said upper plate and discharge the same from the periphery of the space between said plates; and a series of fingers spaced around the periphery of said lower plate and depending thErefrom, said depending fingers being equally spaced about the periphery of the underside of said lower plate, having a radial length less than the radial length of said vanes and having a lateral thickness adjacent the outer edge greater than adjacent the inner edge thereof.
Claim 3
Dependent Claim
30 words
An impeller as defined in claim 1, wherein the vertical distance between said upper and lower plates is greater adjacent said central opening than adjacent the periphery of said plates.
Claim 4
Dependent Claim
27 words
An impeller as defined in claim 1, wherein the lateral thickness of said vanes is greater adjacent the periphery of said plates than adjacent said central opening.
Claim 5
Dependent Claim
34 words
An impeller as defined in claim 3, wherein said vanes are equally spaced and each vane has substantially the same lateral thickness at different points along the radial length thereof as the other vanes.
Claim 6
Dependent Claim
22 words
An impeller as defined in claim 4, wherein the centerline of each said vane lies in approximately a radius of said plates.
Claim 7
Dependent Claim
25 words
An impeller as defined in claim 1, wherein both the inner upright edge and the outer upright edge of said fingers is rounded and convex.
Claim 8
Dependent Claim
74 words
An impeller as defined in claim 1, wherein: the vertical distance between said upper and lower plates is greater adjacent said central opening than adjacent the periphery of said plates; said vanes are equally spaced, and each vane has substantially the same lateral thickness at different points along the radial length thereof as the other vanes; and both the inner upright edge and the outer upright edge of said fingers is rounded and convex.
Claim 9
Dependent Claim
181 words
In a flotation machine having a tank, the combination with an impeller as defined in claim 7, of: a series of generally radial, upright vanes disposed outwardly from and surrounding said impeller adjacent the bottom of said tank; means for supporting said outward vanes to hold said vanes with the lower edges thereof spaced from the bottom of said tank; means for rotating said impeller about a vertical axis supporting said impeller with the lower ends of said depending fingers spaced from the bottom of said tank and including a hollow shaft for supplying an aeration fluid to the underside of said impeller; said outward vanes having a lateral thickness adjacent the inner edge greater than the lateral thickness adjacent the outer edge thereof and the inner edges of said vanes being rounded and convex; and the upper inner edges of said outward vanes being disposed above the outer upper periphery of said impeller and the lower ends of said depending fingers and the lower edges of said outward vanes are disposed at approximately the same height above said tank bottom.
Claim 10
Dependent Claim
84 words
A rotatable impeller for a flotation machine, comprising: a circular lower plate; a circular upper plate concentric with and spaced from said lower plate, said upper plate having a circular central opening therein; and a series of vanes extending generally radially and disposed between said upper and lower plates, said vanes having a greater lateral thickness adjacent the periphery of said plates than adjacent said opening and both the inner upright edge and the outer upright edge of said vanes is rounded and convex.
Claim 11
Dependent Claim
84 words
A rotatable impeller for a flotation machine, comprising: a circular lower plate; a circular upper plate concentric with and spaced from said lower plate, said upper plate having a circular central opening therein; and a series of vanes extending generally radially and disposed between said upper and lower plates, said vanes having a greater lateral thickness adjacent the periphery of said plates than adjacent said opening and both the inner upright edge and the outer upright edge of said vanes is rounded and convex.
Claim 12
Dependent Claim
145 words
In a flotation machine having a tank, the combination with an impeller having: a pair of vertically spaced, concentric circular plates, each of said plates having a central circular opening, with one opening being smaller than the other; a series of vanes extending generally radially and disposed between said plates; a series of fingers extending vertically from one of said plates and spaced around the periphery thereof; of a series of generally radial, upright vanes disposed outwardly from and surrounding said impeller adjacent the bottom of said tank; means for supporting said outward vanes with the lower edges thereof spaced from the bottom of said tank; and a hollow shaft for rotating said impeller about a vertical axis with the lower edge of said impeller spaced froM the bottom of said tank, said hollow shaft supplying an aeration fluid to the underside of said impeller.
Claim 13
Dependent Claim
145 words
In a flotation machine having a tank, the combination with an impeller having: a pair of vertically spaced, concentric circular plates, each of said plates having a central circular opening, with one opening being smaller than the other; a series of vanes extending generally radially and disposed between said plates; a series of fingers extending vertically from one of said plates and spaced around the periphery thereof; of a series of generally radial, upright vanes disposed outwardly from and surrounding said impeller adjacent the bottom of said tank; means for supporting said outward vanes with the lower edges thereof spaced from the bottom of said tank; and a hollow shaft for rotating said impeller about a vertical axis with the lower edge of said impeller spaced froM the bottom of said tank, said hollow shaft supplying an aeration fluid to the underside of said impeller.
Claim 14
Dependent Claim
31 words
In a flotation machine as defined in claim 10, wherein: said outward vanes have a lateral thickness adjacent the inner edge greater than the lateral thickness adjacent the outer edge thereof.
Claim 15
Dependent Claim
21 words
In a flotation machine as defined in claim 11, wherein: the inner edges of said outward vanes are rounded and convex.
Claim 16
Dependent Claim
35 words
In a flotation machine as defined in claim 10, wherein: said outward vanes are equally spaced about the periphery of said impeller and the outer edges of said outward vanes correspond generally to a rectangle.
Claim 17
Dependent Claim
28 words
In a flotation machine as defined in claim 10, wherein: the upper inner edges of said outward vanes are disposed above the outer upper periphery of said impeller.
Claim 18
Dependent Claim
36 words
In a flotation machine as defined in claim 14, wherein: the lower edges of said depending fingers and the lower edges of said outward vanes are disposed at approximately the same height above said tank bottom.
Claim 19
Dependent Claim
154 words
In a flotation machine having a tank: an impeller disposed adjacent the bottom of said tank, having upper pumping means for receiving pulp and the like centrally and from above and discharging the same outwardly, and lower agitation and pumping means for agitating and moving outwardly pulp and the like from the underside of said impeller; means for rotating said impeller and supporting said impeller spaced from the bottom of said tank; means for supplying an aeration fluid to said lower agitating and pumping means; means surrounding said impeller, for receiving a pulp mixture from both said upper pumping means and said lower agitating and moving means, for interrupting the circular flow of said pulp mixtures and for producing an intermixing of said pulp mixtures with said aeration fluid; and means for supporting said means surrounding said impeller at a position above the bottom of said tank corresponding to the position of said impeller.
Claim 20
Dependent Claim
154 words
In a flotation machine having a tank: an impeller disposed adjacent the bottom of said tank, having upper pumping means for receiving pulp and the like centrally and from above and discharging the same outwardly, and lower agitation and pumping means for agitating and moving outwardly pulp and the like from the underside of said impeller; means for rotating said impeller and supporting said impeller spaced from the bottom of said tank; means for supplying an aeration fluid to said lower agitating and pumping means; means surrounding said impeller, for receiving a pulp mixture from both said upper pumping means and said lower agitating and moving means, for interrupting the circular flow of said pulp mixtures and for producing an intermixing of said pulp mixtures with said aeration fluid; and means for supporting said means surrounding said impeller at a position above the bottom of said tank corresponding to the position of said impeller.
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) | 1977-10-21 | 1978-04-22 | 1978-10-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-21 | 1982-04-22 | 1982-10-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-21 | 1986-04-22 | 1986-10-22 | $7700.00 | Window Closed / Lapsed |