US3895893A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotary piston pump
Assignee: Individual
•
Filing: 1972-12-04
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Granted: 1975-07-22
•
Expires: 1992-12-04
Abstract
Abstract A rotary piston pump comprises vanes mounted on shafts extending radially from a hub and traveling around an annular channel having a forwarding or pumping portion of circular cross section and a restricted sealing portion corresponding in cross section to the diametrical cross section of the vanes. Control means is provided for turning the vanes about radial axes so as to position the vanes approximately perpendicular to their direction of movement while passing through the forwarding portion of the channel and to turn them approximately 90* so as to pass through the sealing portion of the channel in an edgewise position. At the ends of the forwarding portion the channel is connected respectively with inlet and outlet passageways.
Inventors
- 👤 Manfred Sommer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 22:41
CPC Classifications
F; F04; F04C; F04C3/00; F04C3/02
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
393 words
A rotary piston pump comprising a casing having an annular channel therein, a hub rotatable in said casing concentric with said annular channel, said hub comprising a shaft portion rotatably supported in said casing and an overhanging annular flange portion at an inner end of said shaft portion and having a central space inside said shaft portion and having a central space inside said annular flange portion, said flange portion being disposed wholly radially inwardly of said annular channel of the casing, means providing a fluid tight seal between said hub and said casing, means for rotating said hub, a plurality of circumferentially spaced generally radial shafts extending through and rotatably supported by said annular flange portion of said hub, a flat circular disc-shaped vane mounted on the outer end of each of said shafts and disposed in said annular channel whereby upon rotation of said hub, said vanes are carried around in said annular channel, said channel having an arcuate pumping portion of uniform circular cross section corresponding in size to said circular vanes and a sealing portion of restricted cross section corresponding in size and shape to the diametrical cross section of said vanes, inlet and outlet openings at the opposite ends respectively of said pumping channel portion and means for cyclically controlling the rotational orientation of said vanes in said channel to hold said vanes at least approximately perpendicular to the direction of movement while passing through said pumping channel portion and to position said vanes in line with said direction of movement for passage through said sealing channel portion, said controlling means comprising portions of said shafts extending inwardly to said central space inside said annular flange portion of said hub, an eccentric portion on the inner end of each said shaft and actuating means acting cyclically on said eccentric portions to orientate said vanes, the peripheral edge of each of said vanes in cross section being of spherical curvature and being formed of resilient non-metallic material to provide an effective seal with the wall of said channel, the circumferential length of said sealing channel portion being at least slightly greater than the spacing between successive vanes whereby one vane enters the upstream end of said sealing channel portion sufficiently to form a seal therein before the preceding vane exits from the downstream end of said sealing channel portion.
Claim 2
Dependent Claim
393 words
A rotary piston pump comprising a casing having an annular channel therein, a hub rotatable in said casing concentric with said annular channel, said hub comprising a shaft portion rotatably supported in said casing and an overhanging annular flange portion at an inner end of said shaft portion and having a central space inside said shaft portion and having a central space inside said annular flange portion, said flange portion being disposed wholly radially inwardly of said annular channel of the casing, means providing a fluid tight seal between said hub and said casing, means for rotating said hub, a plurality of circumferentially spaced generally radial shafts extending through and rotatably supported by said annular flange portion of said hub, a flat circular disc-shaped vane mounted on the outer end of each of said shafts and disposed in said annular channel whereby upon rotation of said hub, said vanes are carried around in said annular channel, said channel having an arcuate pumping portion of uniform circular cross section corresponding in size to said circular vanes and a sealing portion of restricted cross section corresponding in size and shape to the diametrical cross section of said vanes, inlet and outlet openings at the opposite ends respectively of said pumping channel portion and means for cyclically controlling the rotational orientation of said vanes in said channel to hold said vanes at least approximately perpendicular to the direction of movement while passing through said pumping channel portion and to position said vanes in line with said direction of movement for passage through said sealing channel portion, said controlling means comprising portions of said shafts extending inwardly to said central space inside said annular flange portion of said hub, an eccentric portion on the inner end of each said shaft and actuating means acting cyclically on said eccentric portions to orientate said vanes, the peripheral edge of each of said vanes in cross section being of spherical curvature and being formed of resilient non-metallic material to provide an effective seal with the wall of said channel, the circumferential length of said sealing channel portion being at least slightly greater than the spacing between successive vanes whereby one vane enters the upstream end of said sealing channel portion sufficiently to form a seal therein before the preceding vane exits from the downstream end of said sealing channel portion.
Claim 3
Dependent Claim
44 words
A rotary piston pump according to claim 1, comprising means for varying the angle of said vanes while in said pumping channel pOrtion to provide different delivery rates of the medium being pumped while the speed of rotation of the pump is the same.
Claim 4
Dependent Claim
46 words
A rotary piston pump according to claim 1, wherein said actuating means comprises stationary cam means disposed in said central space in said hub and engaged by said eccentric portions as the hub rotates to control the rotational positioning of said shafts and the respective vanes.
Claim 5
Dependent Claim
42 words
A rotary piston pump according to claim 1, wherein said channel and said inlet and outlet openings are symmetrical about a diametrical line midway between said openings so that opposite halves are mirror images of one another, whereby said pump is reversible.
Claim 6
Dependent Claim
36 words
A rotary piston pump according to claim 1, comprising means in at least said inlet opening for guiding the medium being pumped into said channel and for holding back excessively large solid objects in said medium.
Claim 7
Dependent Claim
21 words
A rotary piston pump according to claim 1, wherein there are an even number of said vanes not less than four.
Claim 8
Dependent Claim
48 words
A rotary piston pump according to claim 1, wherein said hub comprises a cylindrical body portion rotatable in said casing and adapted to be connected to a motor for driving said hub and an annular flange portion extending axially from said body portion and rotatably supporting said shafts.
Claim 9
Dependent Claim
55 words
A rotary piston pump according to claim 1, in which said sealing means comprises packing rings providing a seal between said body portion of the hub and said casing and sealing rings providing a seal between the periphery of said flange portion and a surrounding portion of said casing on opposite sides of said channel.
Claim 10
Dependent Claim
35 words
A rotary piston pump according to claim 1, wherein at least the peripheral edge portion of said vanes is formed of a resilient non-metallic material selected from the group consisting of elastomers and resilient plastics.
Claim 11
Dependent Claim
23 words
A rotary piston pump according to claim 9, wherein at least the peripheral edge portion of said vanes is formed of a polyamide.
Claim 12
Dependent Claim
30 words
A rotary piston pump according to claim 1, further comprising ramp means disposed upstream of said sealing channel portion and engageable successively with one side of each of said vanes.
Claim 13
Dependent Claim
33 words
A rotary piston pump according to claim 11, wherein said ramp means is resilient to lessen the impact of the vanes therewith and thereby contribute to the smooth quiet running of the pump.
Claim 14
Dependent Claim
47 words
A rotary piston pump according to claim 11, wherein at least a surface portion of each of said vanes engaging said ramp means is resilient to lessen the impact of the vane with said ramp means and thereby contribute to the smooth quiet running of the pump.
Claim 15
Dependent Claim
18 words
A rotary piston pump according to claim 11, wherein said ramp means engages each of the vanes locally.
Claim 16
Dependent Claim
22 words
A rotary piston pump according to claim 11, wherein said ramp means comprises a formed sheet metal member set in said channel.
Claim 17
Dependent Claim
39 words
A rotary piston pump according to claim 11, wherein said ramp means comprises at least one bar with an opening between the bar and the wall of said channel for the passage of objects in the medium being pumped.
Claim 18
Dependent Claim
54 words
A rotary piston pump according to claim 1, wherein said actuating means comprises connecting rod means connected to each said eccentric portion and extending approximately parallel to the axis of said hub and guided for endwise movement, and a control member having an inclined face engageably by the ends of said connecting rod means.
Claim 19
Dependent Claim
20 words
A rotary piston pump according to claim 17, wherein said control member is a disc tiltably supported at its center.
Claim 20
Dependent Claim
49 words
A rotary piston pump according to claim 17, comprising means for adjustably moving said control member axially of the hub shaft axis to vary the play between said connecting rod means and said inclined face and thereby provide play of a selected amount in the connection between said vanes.
Claim 21
Dependent Claim
29 words
A rotary piston pump according to claim 17, wherein each of said connecting rod means comprises two telescopically disposed mEmbers with elastic means therebetween to provide selected longitudinal resiliency.
Claim 22
Dependent Claim
18 words
A rotary piston pump according to claim 17, wherein said inclined face of said control member is plane.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-07-21 | 1979-01-20 | 1979-07-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-07-21 | 1983-01-20 | 1983-07-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-07-21 | 1987-01-20 | 1987-07-22 | $7700.00 | Window Closed / Lapsed |