US3572976A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluid takeoff device for canned motor driven pump
Assignee: Nikkiso Co Ltd
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Filing: 1968-10-01
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Granted: 1971-03-30
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Expires: 1988-10-01
Abstract
Abstract A fluid takeoff device for canned motor driven pump in which a part of the circulation fluid for cooling and lubricating motor rotors and bearings is led through the back wall of the pump impeller chamber so that a flow rate of the circulation fluid is always stabilized without being influenced by the variation in a discharge rate of the pump.
Inventors
- 👤 Ryuichi Sato
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 16:48
CPC Classifications
F; F04; F04D; F04D13/00; F04D13/02; F04D13/06; F04D13/0606; F04D13/0613
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
120 words
In a canned motor driven pump, takeoff means of fluid for cooling and lubricating motor rotors and bearings, which comprises circular groove means provided with a predetermined width and depth in an impeller chamber surface of a partition wall partitioning impeller chamber and motor chamber and at a predetermined distance from the center of impeller chamber surface, filtering means mounted on the circular groove means for filtering off slurries, fluid chamber means formed between walls of the circular groove means and the filtering means, and slot means provided in the partition wall and connected at its one end to the circular groove means and at its the other end to the circulation connection for feeding a part of circulation fluid.
Claim 2
Dependent Claim
120 words
In a canned motor driven pump, takeoff means of fluid for cooling and lubricating motor rotors and bearings, which comprises circular groove means provided with a predetermined width and depth in an impeller chamber surface of a partition wall partitioning impeller chamber and motor chamber and at a predetermined distance from the center of impeller chamber surface, filtering means mounted on the circular groove means for filtering off slurries, fluid chamber means formed between walls of the circular groove means and the filtering means, and slot means provided in the partition wall and connected at its one end to the circular groove means and at its the other end to the circulation connection for feeding a part of circulation fluid.
Claim 3
Dependent Claim
42 words
Takeoff means of fluid for cooling and lubricating motor rotors and bearings according to claim 1, wherein filtering means is fitted to circular groove means so that surface of said filtering means resides in the same plane as the impeller chamber surface.
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) | 1974-03-29 | 1974-09-28 | 1975-03-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-29 | 1978-09-28 | 1979-03-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-29 | 1982-09-28 | 1983-03-30 | $7700.00 | Window Closed / Lapsed |