US4389159A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Centrifugal pump
Assignee: Grundfos Management AS
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Filing: 1980-11-25
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Granted: 1983-06-21
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Expires: 2000-11-25
Abstract
Abstract A centrifugal pump with a housing which has circular shape in the direction of the circumference and which has on its circumference an exit tube commencing at an exit port tangentially with reference to the flow, where the length of the exit port in the direction of the housing's circumference is about π/4R and where the outer wall of the exit tube constitutes a diverging bulge on outward transition from the circumference. The outer wall of the exit tube, projecting under an angle about 45 degrees from the circumference of the housing, consists of an arc having the center of its radius (r) approximately at the juncture of the opposite wall of the exit tube and the housing circumference.
Inventors
- 👤 Hannu Sarvanne
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 12:05
CPC Classifications
F; F04; F04D; F04D29/00; F04D29/40; F04D29/42; F04D29/44; F04D29/445
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
128 words
A centrifugal pump with a housing which has circular shape in the direction of the circumference and which has on its circumference an exit tube commencing at an exit port substantially tangential with reference to the flow, where the length of the exit port in the direction of the housing circumference is about π/4 times the inner radius of said housing and where the outer wall of the exit tube constitutes a diverging bulge on outward transition from the circumference, and wherein the outer wall of the exit tube, projecting under an angle about 45 degrees from the circumference of the housing, consists of an arc having the centre of its radius approximately at the juncture of the opposite wall of the exit tube and the housing circumference.
Claim 2
Dependent Claim
128 words
A centrifugal pump with a housing which has circular shape in the direction of the circumference and which has on its circumference an exit tube commencing at an exit port substantially tangential with reference to the flow, where the length of the exit port in the direction of the housing circumference is about π/4 times the inner radius of said housing and where the outer wall of the exit tube constitutes a diverging bulge on outward transition from the circumference, and wherein the outer wall of the exit tube, projecting under an angle about 45 degrees from the circumference of the housing, consists of an arc having the centre of its radius approximately at the juncture of the opposite wall of the exit tube and the housing circumference.
Claim 3
Dependent Claim
23 words
The centrifugal pump of claim 1, wherein the mean velocity in the exit tube is substantially less than that in the pump housing.
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) | 1986-06-20 | 1986-12-20 | 1987-06-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-06-20 | 1990-12-20 | 1991-06-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-06-20 | 1994-12-20 | 1995-06-21 | $7700.00 | Window Closed / Lapsed |