US3790309A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Unitary pump-motor assembly
Assignee: Allweiler GmbH
•
Filing: 1971-08-26
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Granted: 1974-02-05
•
Expires: 1991-08-26
Abstract
Abstract A housing enclosing a motor and a pump having a common drive shaft. The pump is composed of helical driving and idler elements and the motor is cooled by a secondary flow of liquid forced through the motor by helical passages, or similar arrangements, to thereafter sweep the heat generating surfaces of the motor.
Inventors
- 👤 H Volz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 17:26
CPC Classifications
H; H02; H02K; H02K5/00; H02K5/04; H02K5/12; F; F04; F04C; F04C2/00; F04C2/08; F04C2/12; F04C2/14; F04C2/16; F04C2/165; H02K5/132
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
203 words
Apparatus for pumping a fluid comprising: a housing having a pressure and a suction chamber; a fluid inlet in said housing having a passageway to said suction chamber; a fluid outlet in said housing having a passageway to said pressure chamber; a pump within the suction chamber of said housing for transferring the fluid from the fluid inlet to the fluid outlet; a motor having a stator and rotor within said housing at a location essentially out of the path of the fluid passing from said inlet to said outlet; said pump and motor being spaced relative to each other and the outlet passageway being located generally therebetween; fluid cooling passageways between said stator and rotor and between the motor and the housing encompassing most of the outside surfaces of the motor; auxiliary flow producing means disposed within said pressure chamber adjacent to the axial end of said motor closest to said fluid outlet, said auxiliary flow producing means being effective to force and divert a comparatively small portion of the fluid which has passed the pump and is within the pressure chamber into said cooling passageways and thereafter into the passageway of the outlet without returning the fluid to the suction chamber.
Claim 2
Dependent Claim
203 words
Apparatus for pumping a fluid comprising: a housing having a pressure and a suction chamber; a fluid inlet in said housing having a passageway to said suction chamber; a fluid outlet in said housing having a passageway to said pressure chamber; a pump within the suction chamber of said housing for transferring the fluid from the fluid inlet to the fluid outlet; a motor having a stator and rotor within said housing at a location essentially out of the path of the fluid passing from said inlet to said outlet; said pump and motor being spaced relative to each other and the outlet passageway being located generally therebetween; fluid cooling passageways between said stator and rotor and between the motor and the housing encompassing most of the outside surfaces of the motor; auxiliary flow producing means disposed within said pressure chamber adjacent to the axial end of said motor closest to said fluid outlet, said auxiliary flow producing means being effective to force and divert a comparatively small portion of the fluid which has passed the pump and is within the pressure chamber into said cooling passageways and thereafter into the passageway of the outlet without returning the fluid to the suction chamber.
Claim 3
Dependent Claim
28 words
A pump-motor assembly according to claim 1, wherein said motor comprises a rotor having at least one helical liquid flow passage extending along the axis of said rotor.
Claim 4
Dependent Claim
33 words
A pump-motor assembly according to claim 1, wherein said motor comprises a stator having at least one helical liquid flow passage extending along the axis of said stator on the internal face thereof.
Claim 5
Dependent Claim
31 words
A pump-motor assembly according to claim 1, wherein said motor includes a drive shaft and said fluid flow means comprises a radial or axial pump wheel arranged on said drive shaft.
Claim 6
Dependent Claim
20 words
A pump-motor assembly according to claim 4, and a balancing disc interposed between said drive shaft and said pump wheel.
Claim 7
Dependent Claim
31 words
A pump-motor assembly according to claim 1, wherein said fluid flow means comprises a longitudinally extending passage in said motor whose distance from the motor axis increases in one axial direction.
Claim 8
Dependent Claim
19 words
A pump-motor assembly according to claim 1, wherein said motor comprises a rotor and a stator of conical configuration.
Claim 9
Dependent Claim
37 words
A pump-motor assembly according to claim 1, wherein said pump comprises helical fluid displacement elements, and said motor is located in or proximate to said pressure chamber; and a common drive shaft for said pump and motor.
Claim 10
Dependent Claim
33 words
A pump-motor assembly according to claim 8, wherein said displacement elements terminate into said pressure chamber; and part of said common drive shaft constitutes an integral part of one of said displacement elements.
Claim 11
Dependent Claim
21 words
A pump-motor assembly according to claim 9, wherein said drive shaft is supported in the housing only at its axial ends.
Claim 12
Dependent Claim
42 words
A pump-motor assembly according to claim 10, and a bearing for supporting said common drive shaft arranged spaced from said pressure chamber in a housing location effective to equalize the axial forces acting upon the motor shaft and the pump shaft portions.
Claim 13
Dependent Claim
46 words
A pump-motor assembly according to claim 11, wherein said pump comprises idler elements and a drive element, and cylindrical collars on the axial ends of said idler element bearing against said housing and the opposite end thereof providing a supporting end surface for said drive element.
Claim 14
Dependent Claim
21 words
A pump-motor assembly according to claim 12, wherein the axial ends of said idler elements terminate proximate to said pressure chamber.
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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) | 1977-02-04 | 1977-08-06 | 1978-02-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-04 | 1981-08-06 | 1982-02-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-04 | 1985-08-06 | 1986-02-05 | $7700.00 | Window Closed / Lapsed |