US5215429A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Regenerative turbine having predetermined clearance relationship between channel ring and impeller
Assignee: Pentair Pump Group Inc
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Filing: 1992-01-10
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Granted: 1993-06-01
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Expires: 2012-01-10
Abstract
Abstract A regenerative turbine pump apparatus which includes a housing having an inlet and an outlet and an impeller mounted for rotation within the housing. The impeller has an outer diameter and a channel ring is disposed around the impeller. The channel ring has a first arcuate portion that has a first radius to provide a substantially uniform first clearance with respect to the outer diameter of the impeller and the first arcuate portion extends throughout a major part of the channel ring. The channel ring includes a second arcuate portion proximate to the inlet having a second clearance with respect to the outer diameter of the impeller that is greater than the first clearance.
Inventors
- 👤 Hongwei Sun
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 11:43
CPC Classifications
F; F04; F04D; F04D29/00; F04D29/66; F04D29/669; F04D5/00; F04D5/002; F04D5/007; F05; F05B; F05B2250/00; F05B2250/50; F05B2250/503
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
125 words
A regenerative turbine pump apparatus which comprises: a housing having an inlet and an outlet; an impeller mounted for rotation within said housing, said impeller having an outer diameter that is uniform throughout the angular extent thereof; a channel ring disposed around said impeller, said channel ring having a first arcuate portion that has a first radius to provide a substantially uniform first clearance with respect to said outer diameter of said impeller, said first arcuate portion extending throughout a major part of said channel ring, said channel ring including a second arcuate portion proximate said inlet having a second clearance with respect to said outer diameter of said impeller that is greater than said first clearance, said second arcuate portion extending throughout 90 degrees.
Claim 2
Dependent Claim
125 words
A regenerative turbine pump apparatus which comprises: a housing having an inlet and an outlet; an impeller mounted for rotation within said housing, said impeller having an outer diameter that is uniform throughout the angular extent thereof; a channel ring disposed around said impeller, said channel ring having a first arcuate portion that has a first radius to provide a substantially uniform first clearance with respect to said outer diameter of said impeller, said first arcuate portion extending throughout a major part of said channel ring, said channel ring including a second arcuate portion proximate said inlet having a second clearance with respect to said outer diameter of said impeller that is greater than said first clearance, said second arcuate portion extending throughout 90 degrees.
Claim 3
Dependent Claim
25 words
The apparatus as described in claim 1 wherein: said second clearance is greater nearer to said inlet than at parts thereof remote from said inlet.
Claim 4
Dependent Claim
25 words
The apparatus as described in claim 2 wherein: said second clearance tapers from said first clearance to an increasingly greater clearance along the extent thereof.
Claim 5
Dependent Claim
28 words
The apparatus as described in claim 3 wherein: said second arcuate portion is arc shaped and has a radius greater than an arc defining said first arcuate portion.
Claim 6
Dependent Claim
30 words
The apparatus as described in claim 4 wherein: said second arcuate portion has a center of curvature that is different from a center of curvature of said first arcuate portion.
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) | 1996-05-31 | 1996-11-30 | 1997-06-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-05-31 | 2000-11-30 | 2001-06-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-05-31 | 2004-11-30 | 2005-06-01 | $7700.00 | Window Closed / Lapsed |