US5106263A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Centrifugal pump with high efficiency impeller
Assignee: JIDOHSA DENKI KOGYO KK
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Filing: 1990-09-21
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Granted: 1992-04-21
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Expires: 2010-09-21
Abstract
Abstract A small-sized centrifugal pump is improved in its efficiency and performance by having an impeller the height of which is higher than theoretically calculated value and decreases in the circumferential direction from the central portion, and which has a flow channel with a narrow and constant width.
Inventors
- 👤 Masao Irie
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 08:32
CPC Classifications
F; F04; F04D; F04D29/00; F04D29/18; F04D29/22; F04D29/2238; F04D29/2255
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
147 words
A centrifugal pump comprising: a housing having a motor casing and a pump casing; a motor mounted in said motor casing and having a shaft extending into said pump casing; and an impeller mounted on said shaft in said pump casing for rotation by said motor; said impeller being provided with vanes having a height decreasing from the height h 1 at a center of said impeller to a height h 2 at an outer circumference of said impeller and being provided with an entrance having an area A at the center and flow channels having substantially constant width W leading from the center to the outer circumference between adjacent vanes; wherein a ratio (W/h 1 ) of the width W of said flow channel to the height h 1 of said vane at the center of said impeller is in the range of 0.5 to 1.2.
Claim 2
Dependent Claim
147 words
A centrifugal pump comprising: a housing having a motor casing and a pump casing; a motor mounted in said motor casing and having a shaft extending into said pump casing; and an impeller mounted on said shaft in said pump casing for rotation by said motor; said impeller being provided with vanes having a height decreasing from the height h 1 at a center of said impeller to a height h 2 at an outer circumference of said impeller and being provided with an entrance having an area A at the center and flow channels having substantially constant width W leading from the center to the outer circumference between adjacent vanes; wherein a ratio (W/h 1 ) of the width W of said flow channel to the height h 1 of said vane at the center of said impeller is in the range of 0.5 to 1.2.
Claim 3
Dependent Claim
32 words
A centrifugal pump as set forth in claim 1, wherein each flow channel of said impeller is formed of two arcs of co-axial circles having radii r 1 and r 2 .
Claim 4
Dependent Claim
23 words
A centrifugal pump as set forth in claim 1, wherein each of said flow channels of said impeller are formed of two involutes.
Claim 5
Dependent Claim
38 words
A centrifugal pump as set forth in claim 1, wherein the height H 2 of said vane at the outer circumference of said impeller is in a range from one-seventh to one-fourth of a diameter of said impeller.
Claim 6
Dependent Claim
27 words
A centrifugal pump as set forth in claim 1, wherein said impeller is fitted onto said shaft of said motor with movable play in an axial direction.
Claim 7
Dependent Claim
24 words
A centrifugal pump as set forth in claim 5, wherein said impeller is provided with at least one balance hole adjacent a boss thereof.
Claim 8
Dependent Claim
35 words
A centrifugal pump as set forth in claim 6, wherein a plurality of balance holes are provided having a total area ranging from 25% to 50% of area A of said entrance of said impeller.
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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) | 1995-04-21 | 1995-10-21 | 1996-04-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-04-21 | 1999-10-21 | 2000-04-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-04-21 | 2003-10-21 | 2004-04-21 | $7700.00 | Window Closed / Lapsed |