US4251192A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotary pump with symmetrical by-pass and rotor with resiliently mounted vanes
Assignee: Individual
•
Filing: 1978-12-07
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Granted: 1981-02-17
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Expires: 1998-12-07
Abstract
Abstract A rotary pump for pumping liquids is provided. The pump is compact with a bypass system built into the pump housing. The pump is symmetrical about a center line so it can pump liquids in opposite directions simply by reversing the rotation of the drive shaft and without making any changes in the pump itself. The bypass also is designed to open equally with liquids flowing in either direction. The pump has self-lubricating vanes or blades which are designed so that the liquid being pumped can move behind the blades and urge them outwardly against the pump chamber wall, with the liquid also helping to lubricate the blades. The pump also has improved mechanical seals and bearings for the drive shaft.
Inventors
- 👤 Alonzo R. Clark
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 15:43
CPC Classifications
F; F04; F04C; F04C14/00; F04C14/24; F04C14/26; F04C15/00; F04C15/0003; F04C15/0034; F04C15/0038; F04C2/00; F04C2/30; F04C2/34; F04C2/344; F04C2/3441; F16; F16J; F16J15/00; F16J15/16; F16J15/34; F16J15/3464
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
253 words
A rotary pump comprising a housing having a substantially symmetrical shape about a center line thereof and forming an elliptical pumping chamber having its center on the center line, a first liquid passage formed in said housing, said first passage communicating with said chamber and extending to an outside surface of said housing, a second liquid passage formed in said housing, said second passage communicating with said chamber and extending to an outside surface of said housing, bypass passage means formed in said housing, said passage means communicating with said first and second passages and extending around said chamber, a bypass valve assembly including a valve and a valve seat communicating with said bypass passage means, said housing forming a valve chamber symmetrical with the housing center line and communicating with said bypass passage means, said valve seat being formed by a valve seat rod carried by said housing on the center line of said housing, said valve being of cylindrical shape and moveable in said valve chamber on the side of said valve seat rod opposite said pumping chamber, and spring means in said valve chamber urging said valve toward said valve seat rod, a rotor in said pumping chamber, a drive shaft affixed to said rotor, being located on the housing center line, and extending outwardly beyond both ends of said pumping chamber, bearing and sealing means supported by said housing and rotatably supporting said drive shaft, and vanes carried by said rotor and contacting the wall of said pumping chamber.
Claim 2
Dependent Claim
253 words
A rotary pump comprising a housing having a substantially symmetrical shape about a center line thereof and forming an elliptical pumping chamber having its center on the center line, a first liquid passage formed in said housing, said first passage communicating with said chamber and extending to an outside surface of said housing, a second liquid passage formed in said housing, said second passage communicating with said chamber and extending to an outside surface of said housing, bypass passage means formed in said housing, said passage means communicating with said first and second passages and extending around said chamber, a bypass valve assembly including a valve and a valve seat communicating with said bypass passage means, said housing forming a valve chamber symmetrical with the housing center line and communicating with said bypass passage means, said valve seat being formed by a valve seat rod carried by said housing on the center line of said housing, said valve being of cylindrical shape and moveable in said valve chamber on the side of said valve seat rod opposite said pumping chamber, and spring means in said valve chamber urging said valve toward said valve seat rod, a rotor in said pumping chamber, a drive shaft affixed to said rotor, being located on the housing center line, and extending outwardly beyond both ends of said pumping chamber, bearing and sealing means supported by said housing and rotatably supporting said drive shaft, and vanes carried by said rotor and contacting the wall of said pumping chamber.
Claim 3
Dependent Claim
30 words
A rotary pump according to claim 1 characterized by adjustable means in said valve chamber and accessible outside said housing for adjusting the force of said spring on said valve.
Claim 4
Dependent Claim
88 words
A rotary pump according to claim 1 characterized by said bearing and sealing means each comprising a support affixed to said housing, a sealing block with a planar surface perpendicular to said drive shaft and affixed to said support, a second sealing block mounted on said drive shaft and having a planar surface perpendicular to said drive shaft and positioned contiguous with the planar surface of said first sealing block, and means mounted on the drive shaft for urging said second sealing block toward said first sealing block.
Claim 5
Dependent Claim
40 words
A rotary pump according to claim 3 characterized further by said urging means comprising a collar affixed to the drive shaft, and a plurality of guide pins carried by said collar and extending into bores in said second sealing block.
Claim 6
Dependent Claim
220 words
A rotary pump for pumping liquids, said pump having a substantially symmetrical shape about a center line thereof, said pump comprising means forming a pumping chamber having its center on the center line, means forming a first liquid passage communicating with said chamber, means forming a second liquid passage communicating with said chamber, bypass passage means communicating with said first and second passages and extending around said chamber, and being substantially symmetrical with respect to the center line, a bypass valve assembly including a valve and a valve seat communicating with said bypass passage means, said valve seat being formed by a valve seat rod extending across said bypass passage means on the center line of said pump, said valve being of cylindrical shape and having substantially equal areas exposed to said bypass means on each side of said valve seat rod, whereby said valve will open under substantially equal liquid pressures regardless of the direction in which liquid is being pumped through said pumping chamber, a rotor in said pumping chamber, a drive shaft affixed to said rotor and located on the center line, said drive shaft extending outwardly beyond the ends of said pumping chamber, bearing and sealing means rotatably supporting said drive shaft, and vanes carried by said rotor and contacting the walls of said pumping chamber.
Claim 7
Dependent Claim
220 words
A rotary pump for pumping liquids, said pump having a substantially symmetrical shape about a center line thereof, said pump comprising means forming a pumping chamber having its center on the center line, means forming a first liquid passage communicating with said chamber, means forming a second liquid passage communicating with said chamber, bypass passage means communicating with said first and second passages and extending around said chamber, and being substantially symmetrical with respect to the center line, a bypass valve assembly including a valve and a valve seat communicating with said bypass passage means, said valve seat being formed by a valve seat rod extending across said bypass passage means on the center line of said pump, said valve being of cylindrical shape and having substantially equal areas exposed to said bypass means on each side of said valve seat rod, whereby said valve will open under substantially equal liquid pressures regardless of the direction in which liquid is being pumped through said pumping chamber, a rotor in said pumping chamber, a drive shaft affixed to said rotor and located on the center line, said drive shaft extending outwardly beyond the ends of said pumping chamber, bearing and sealing means rotatably supporting said drive shaft, and vanes carried by said rotor and contacting the walls of said pumping chamber.
Claim 8
Dependent Claim
32 words
A rotary pump according to claim 5 characterized by spring means urging said valve towards said valve seat rod and adjustable means for adjusting the force of said spring on said valve.
Claim 9
Dependent Claim
77 words
A rotary pump according to claim 5 characterized by said bearing and sealing means each comprising a sealing block with a planar surface perpendicular to said drive shaft, a second sealing block mounted on said drive shaft and having a planar surface perpendicular to said drive shaft and positioned contiguous with the planar surface of said first sealing block, and means mounted on said drive shaft for urging said second sealing block toward said first sealing block.
Claim 10
Dependent Claim
39 words
A rotary pump according to claim 7 characterized further by said urging means comprising a collar affixed to the drive shaft, and a plurality of guide pins carried by said collar and extending into bores in said sealing block.
Claim 11
Dependent Claim
85 words
A rotary pump according to claim 5 characterized by said rotor having a plurality of longitudinally-extending, radially-disposed grooves, each of said rotor grooves having recesses, one of said vanes being carried in each of said grooves, each of said vanes having a plurality of recesses extending into the vanes from an inner edge positioned in the rotor groove, each of said rotor grooves having recesses positioned in alignment with the vane recesses, and springs extending into said groove recesses and urging the vanes radially outwardly.
Claim 12
Dependent Claim
25 words
A rotary pump according to claim 9 characterized by outer edges of said vanes having slanted side surfaces terminating in a longitudinally-extending flat central strip.
Claim 13
Dependent Claim
35 words
A rotary pump according to claim 9 characterized by a pin extending through a substantial portion of the length of each of said springs and having an enlarged head received in the corresponding groove recess.
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Cited
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Cited
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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) | 1984-02-17 | 1984-08-18 | 1985-02-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-02-17 | 1988-08-18 | 1989-02-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-02-17 | 1992-08-18 | 1993-02-17 | $7700.00 | Window Closed / Lapsed |