Patent US3576375A successfully refreshed from Google Patents.
US3576375A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluid pumping system
Assignee: Bendix Corp
•
Filing: 1969-07-10
•
Granted: 1971-04-27
•
Expires: 1989-07-10
Abstract
Abstract A pumping system for supplying fuel to the burners of aircraft jet engines. The system comprises a radially-vaned centrifugal pump and a peripheral vortex pump arranged in parallel to cooperatively deliver fuel under the correct pressure for all ranges of operation. The system includes sequential valving or clutching means so that at very low speeds (at ignition), the peripheral vortex pump supplies the fuel and at higher speeds, the radially vaned pump supplies the fuel.
Inventors
- 👤 Clive G B Jackson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 08:07
CPC Classifications
F; F04; F04D; F04D13/00; F04D13/12; F04D15/00; F04D15/0072; F04D29/00; F04D29/18; F04D29/20; F04D5/00; F04D5/002
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
111 words
Fluid pumping apparatus having fluid inlet and fluid discharge passages comprising: pump housing means including first and second chambers having fluid inlet means and fluid exhaust means; said first and second chambers and said fluid inlet means and discharge means arranged in parallel and interconnecting the fluid inlet and fluid discharge passages; first and second dissimilar rotodynamic impellers rotatably contained within said first and second chambers; means for driving said impellers; and control means responsive to fluid pressure in one of said chambers operative to control the flow of fluid from the fluid inlet passage, through the fluid inlet means and fluid exhaust means and out through the fluid discharge passage.
Claim 2
Dependent Claim
111 words
Fluid pumping apparatus having fluid inlet and fluid discharge passages comprising: pump housing means including first and second chambers having fluid inlet means and fluid exhaust means; said first and second chambers and said fluid inlet means and discharge means arranged in parallel and interconnecting the fluid inlet and fluid discharge passages; first and second dissimilar rotodynamic impellers rotatably contained within said first and second chambers; means for driving said impellers; and control means responsive to fluid pressure in one of said chambers operative to control the flow of fluid from the fluid inlet passage, through the fluid inlet means and fluid exhaust means and out through the fluid discharge passage.
Claim 3
Dependent Claim
39 words
The apparatus as claimed in claim 1 wherein said control means comprise: flow controlling valve means operative to terminate fluid delivery to said first chamber means when the fluid pressure in said second chamber means reaches a predetermined level.
Claim 4
Dependent Claim
44 words
The apparatus as claimed in claim 2 including further venting means associated with said first chamber means operative to communicate the fluid inlet of said first chamber means to the atmosphere and the fluid outlet of the first chamber means to a fluid drain.
Claim 5
Dependent Claim
26 words
The apparatus as claimed in claim 1 wherein said second rotodynamic impeller produces a pumping Characteristic wherein the head coefficient is substantially constant for all flows.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-04-26 | 1974-10-26 | 1975-04-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-26 | 1978-10-26 | 1979-04-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-26 | 1982-10-26 | 1983-04-27 | $7700.00 | Window Closed / Lapsed |