Patent US4779990A successfully refreshed from Google Patents.
US4779990A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Impeller apparatus
Assignee: Individual
•
Filing: 1986-11-21
•
Granted: 1988-10-25
•
Expires: 2006-11-21
Abstract
Abstract An impeller apparatus for dispersing a gas into a liquid in a vessel includes a centrifugal flow turbine, the blades (621) of which are formed with a substantially stream-lined trailing surface terminated by a sharply pronounced spine (63). The blade is formed by a plate-like initial blank being cut to a shape having a central line of symmetry, the blank then being folded along the straight line of symmetry.
Inventors
- 👤 Sven Hjort
- 👤 Borje Skanberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 23:39
CPC Classifications
B; B01; B01F; B01F23/00; B01F23/20; B01F23/23; B01F23/233; B01F23/2336; B01F23/23362; B01F27/00; B01F27/05; B01F27/11; B01F27/112; B01F27/1123; B01F27/1125; B01F27/115
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
153 words
An impeller apparatus for agitating a liquid and dispersing a gas introduced therein in a vessel, the apparatus comprising: an impeller; a rotatable vertical shaft carrying the impeller for rotation about an axis of the shaft in said liquid; and means for introducing the gas into the liquid below the impeller; said impeller comprising a disc perpendicularly mounted on the shaft to be rotated therewith, and at least two turbine blades mounted to the disc at the outer periphery of the disc, each blade having a leading surface and a trailing surface with regard to a direction of rotation of the impeller, each leading surface being formed and oriented for producing a substantially radially outwardly directed liquid flow, and each trailing surface having a substantially streamlined cross section which is substantially symmetrically relative to a plane of movement of an axis of the blade and which has a well-defined spine in said plane.
Claim 2
Dependent Claim
153 words
An impeller apparatus for agitating a liquid and dispersing a gas introduced therein in a vessel, the apparatus comprising: an impeller; a rotatable vertical shaft carrying the impeller for rotation about an axis of the shaft in said liquid; and means for introducing the gas into the liquid below the impeller; said impeller comprising a disc perpendicularly mounted on the shaft to be rotated therewith, and at least two turbine blades mounted to the disc at the outer periphery of the disc, each blade having a leading surface and a trailing surface with regard to a direction of rotation of the impeller, each leading surface being formed and oriented for producing a substantially radially outwardly directed liquid flow, and each trailing surface having a substantially streamlined cross section which is substantially symmetrically relative to a plane of movement of an axis of the blade and which has a well-defined spine in said plane.
Claim 3
Dependent Claim
30 words
The apparatus as claimed in claim 1, wherein the blade includes a generally V-shaped section, both legs of which are symmetrical in relation to the longitudinal direction of the blade.
Claim 4
Dependent Claim
36 words
The apparatus as claimed in claim 2, wherein the blade includes a segment defined by two generatrices, the segment being a circular-cylindrical, straight, tubular element which is sharply folded along the central generatrix of the segment.
Claim 5
Dependent Claim
28 words
The apparatus as claimed in claim 3, wherein the blade includes a substantially rectangular or trapezoidal flat plate blank, which is sharply folded about a line of symmetry.
Claim 6
Dependent Claim
28 words
The apparatus as claimed in claim 3, wherein the blade includes a substantially rectangular or trapezoidal flat plate blank, which is sharply folded about a line of symmetry.
Claim 7
Dependent Claim
30 words
The apparatus as claimed in claim 3, wherein the leading concave surface of the blade is filled with structural material up to a plane through the edges of the blade.
Claim 8
Dependent Claim
30 words
The apparatus as claimed in claim 2, wherein the leading concave surface of the blade is filled with structural material up to a plane through the edges of the blade.
Claim 9
Dependent Claim
45 words
The apparatus as claimed in claim 2, wherein the blade includes a segment of a straight, circular-cylindrical tubular element formed by cutting the tubular element along a plane forming an angle to the axis of the element, the segment being bent along a central generatrix.
Claim 10
Dependent Claim
35 words
The apparatus as claimed in claim 2, wherein the blade is formed by a segment defined by two generatrices, the segment being a tapering circular tubular element, which is sharply folded along a central generatrix.
Claim 11
Dependent Claim
45 words
The apparatus as claimed in claim 2, wherein in the normal plane to the longitudinal direction of the blade the distance between the plane of symmetry and the edge of the blade is less than the dimension of the blade in the plane of symmetry.
Claim 12
Dependent Claim
47 words
The apparatus as claimed in claim 2, characterized in that in the normal plane to the longitudinal direction of the blade the distance between the plane of symmetry and the edge of the blade is less than the dimension of the blade in the plane of symmetry.
Claim 13
Dependent Claim
44 words
The apparatus as claimed in claim 2, wherein the blades are mounted such that their effective leading surfaces in the rotational plane of the impeller are within an interval defined by an impeller radius and a backwardly swept line forming 45° with the radius.
Claim 14
Dependent Claim
27 words
The apparatus as claimed in claim 2, further comprising a gas heater mounted to feed gas to the impeller region for dispersing the gas into the liquid.
Claim 15
Dependent Claim
45 words
The apparatus as claimed in claim 1, wherein the blade includes a segment of a straight, circular-cylindrical tubular element formed by cutting the tubular element along a plane forming an angle to the axis of the element, the segment being bent along a central generatrix.
Claim 16
Dependent Claim
27 words
The apparatus as claimed in claim 14, wherein the blade includes a substantially rectangular or trapezoidal flat plate blank, which is sharply folded about aline of symmetry.
Claim 17
Dependent Claim
35 words
The apparatus as claimed in claim 1, wherein the blade is formed by a segment defined by two generatrices, the segment being a tapering circular tubular element, which is sharply folded along a central generatrix.
Claim 18
Dependent Claim
28 words
The apparatus as claimed in claim 16, wherein the blade includes a substantially rectangular or trapezoidal flat plate blank, which is sharply folded about a line of symmetry.
Claim 19
Dependent Claim
45 words
The apparatus as calimed in claim 1, wherein in the normal plane to the longitudinal direction of the blade the distance between the plane of symmetry and the edge of the blade is less than the dimension of the blade in the plane of symmetry.
Claim 20
Dependent Claim
44 words
The apparatus as claimed in claim 1, wherein the blades are mounted such that their effective leading surfaces in the rotational plane of the impeller are within an interval defined by an impeller radius and a backwardly swept line forming 45° with the radius.
Claim 21
Dependent Claim
27 words
The apparatus as claimed in claim 1, further comprising a gas heater mounted to feed gas to the impeller region for dispersing the gas into the liquid.
References Cited (Backward Citations)
US4193A
Cited
US525095A
Cited
US573993A
Cited
US636400A
Cited
US858635A
Cited
US1019078A
Cited
AT123731B
Cited
US2966345A
Cited
US4519715A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-10-25 | 1992-04-25 | 1992-10-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-10-25 | 1996-04-25 | 1996-10-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-10-25 | 2000-04-25 | 2000-10-25 | $7700.00 | Window Closed / Lapsed |