US5257901A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Quick-priming centrifugal pump
Assignee: Whirlpool Corp
•
Filing: 1992-06-24
•
Granted: 1993-11-02
•
Expires: 2012-06-24
Abstract
Abstract A quick priming centrifugal pump for use in automatic washers and the like wherein the size of the vortex which is formed in the pump and which inhibits priming, is reduced in volume, therefore permitting the pump to be a quick priming pump. The pump includes an extended pump impeller hub which reduces the axial length of the vortex which can be formed in the pump inlet. Additionally, a bevelled cut on the end of the inlet further reduces the axial length of the vortex. Lastly, a projecting rib formed on the inner surface of the inlet reduces the diameter of the vortex which may be formed.
Inventors
- 👤 Gregory L. Malchow
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 14:42
CPC Classifications
C; C07; C07K; C07K5/00; C07K5/04; C07K5/10; C07K5/1002; C07K5/1005; C07K5/1008; C07C; C07C229/00; C07C229/02; C07C229/04; C07C229/22; C07C229/26; C07C229/34; C07C229/36; C07C233/00; C07C233/01; C07C233/45; C07C233/46; C07C233/47; C07C233/51; C07C233/64; C07C233/81; C07C233/82; C07C233/83; C07C279/00; C07C279/04; C07C279/14; C07K5/02; C07K5/0202; C07K5/06; C07K5/06008; C07K5/06017; C07K5/06026; C07K5/06034; C07K5/06043; C07K5/06078; C07K5/06139; C07K5/06165; C07K5/08; C07K5/0802; C07K5/0804; C07K5/0808; A; A61; A61K; A61K38/00
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
169 words
A quick priming centrifugal pump comprising: an upper housing having a pump inlet and a pump outlet for fluid to be pumped by said pump, said pump inlet being generally tubular in shape and defining an axis of fluid flow, said tubular pump inlet including a bevelled end; a lower housing at least partially surrounding said pump inlet, said lower housing including a lower housing inlet having an axis of fluid flow transverse to the axis of fluid flow of said pump inlet, said bevelled end facing away from said lower housing inlet; an impeller rotatably mounted in said upper housing, said impeller including an extended hub which projects toward said pump inlet for limiting the volume of a vortex which may be formed in said pump inlet when said pump is operating; and at least one rib means projecting radially and inwardly from an inner tubular surface of said pump inlet for inhibiting the formation of a vortex in said pump inlet during the operation of said pump.
Claim 2
Dependent Claim
169 words
A quick priming centrifugal pump comprising: an upper housing having a pump inlet and a pump outlet for fluid to be pumped by said pump, said pump inlet being generally tubular in shape and defining an axis of fluid flow, said tubular pump inlet including a bevelled end; a lower housing at least partially surrounding said pump inlet, said lower housing including a lower housing inlet having an axis of fluid flow transverse to the axis of fluid flow of said pump inlet, said bevelled end facing away from said lower housing inlet; an impeller rotatably mounted in said upper housing, said impeller including an extended hub which projects toward said pump inlet for limiting the volume of a vortex which may be formed in said pump inlet when said pump is operating; and at least one rib means projecting radially and inwardly from an inner tubular surface of said pump inlet for inhibiting the formation of a vortex in said pump inlet during the operation of said pump.
Claim 3
Dependent Claim
188 words
A quick priming centrifugal pump for use in a washing machine, said pump comprising: an upper housing having a pump inlet and a pump outlet for fluid to be pumped by said pump, said pump inlet being generally tubular in shape and defining an axis of fluid flow, said tubular pump inlet including a bevelled end; a lower housing surrounding said pump inlet, said lower housing including a lower housing inlet having an axis of fluid flow transverse to the axis of fluid flow of said pump inlet, said bevelled end of said pump inlet facing away from said lower housing inlet; an impeller rotatably mounted in said upper housing, said impeller including a rotatable shaft for driving said impeller and a vane secured to said shaft, said impeller including means for projecting toward said pump inlet to reduce the volume of a vortex which may be formed in said pump inlet when said pump is operating; and radially inwardly projecting means formed on an inner tubular surface of said pump inlet for inhibiting the formation of a vortex in said pump inlet when said pump is operating.
Claim 4
Dependent Claim
188 words
A quick priming centrifugal pump for use in a washing machine, said pump comprising: an upper housing having a pump inlet and a pump outlet for fluid to be pumped by said pump, said pump inlet being generally tubular in shape and defining an axis of fluid flow, said tubular pump inlet including a bevelled end; a lower housing surrounding said pump inlet, said lower housing including a lower housing inlet having an axis of fluid flow transverse to the axis of fluid flow of said pump inlet, said bevelled end of said pump inlet facing away from said lower housing inlet; an impeller rotatably mounted in said upper housing, said impeller including a rotatable shaft for driving said impeller and a vane secured to said shaft, said impeller including means for projecting toward said pump inlet to reduce the volume of a vortex which may be formed in said pump inlet when said pump is operating; and radially inwardly projecting means formed on an inner tubular surface of said pump inlet for inhibiting the formation of a vortex in said pump inlet when said pump is operating.
Claim 5
Dependent Claim
21 words
The pump according to claim 2 wherein said projecting means comprises a rib which projects radially inwardly toward said pump inlet.
Claim 6
Dependent Claim
17 words
The pump according to claim 3 wherein said rib is disposed generally axially within said pump inlet.
Claim 7
Dependent Claim
16 words
The pump according to claim 2 wherein said means for projecting comprises an extended impeller hub.
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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) | 1996-11-01 | 1997-05-03 | 1997-11-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-11-01 | 2001-05-03 | 2001-11-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-11-01 | 2005-05-03 | 2005-11-02 | $7700.00 | Window Closed / Lapsed |