US4480967A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Motor-driven pump unit for a high-pressure cleaning apparatus
Assignee: Alfred Kaercher SE and Co KG
•
Filing: 1982-04-14
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Granted: 1984-11-06
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Expires: 2002-04-14
Abstract
Abstract In a motor-driven pump unit for a high-pressure cleaning apparatus, where the cleaning fluid supplied by the high-pressure pump is conveyed through the housing of the motor so as to cool the motor, in order to improve the cooling characteristics and in order to reduce the dimensions of the motor-driven pump unit it is proposed that a fan wheel, which is driven by the motor and which directs a cooling air stream towards the motor housing, be disposed at the end of the motor opposite the pump, and that the fan wheel and the cooling surfaces of the motor be designed in such a way that an adequate cooling of the motor is achieved by the air stream cooling alone when the pump is not conveying any cleaning fluid to the cleaning apparatus or, in other words, is pumping the cleaning fluid only in circulation.
Inventors
- 👤 Werner Schulze
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 02:42
CPC Classifications
B; B08; B08B; B08B3/00; B08B3/02; B08B3/026; F; F04; F04C; F04C11/00; F04C11/008; F04C15/00; F04C15/0096; F04D; F04D13/00; F04D13/02; F04D13/06; F04D29/00; F04D29/58; F04D29/5806; B08B2203/00; B08B2203/02; B08B2203/0205; B08B2203/0223; B08B2203/0235; B08B2203/027
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
148 words
A motor-driven pump unit for a high-pressure cleaning apparatus, with which cleaning fluid supplied by the pump is conveyed through a casing of the motor in order to cool the motor, characterized in operation by the fact that the flow rate of cleaning fluid from said pump to the cleaning apparatus can be varied from zero flow rate to maximum flow rate while said motor continues to operate said pump and characterized in that a fan wheel driven by said motor is disposed on the side of said motor opposite said pump, said fan wheel directing a cooling air stream over said motor casing, and that said fan wheel and cooling surfaces of said motor are dimensioned such that adequate cooling of said motor is achieved by the fan air cooling alone when the flow rate of cleaning fluid from said pump to the cleaning apparatus is zero.
Claim 2
Dependent Claim
148 words
A motor-driven pump unit for a high-pressure cleaning apparatus, with which cleaning fluid supplied by the pump is conveyed through a casing of the motor in order to cool the motor, characterized in operation by the fact that the flow rate of cleaning fluid from said pump to the cleaning apparatus can be varied from zero flow rate to maximum flow rate while said motor continues to operate said pump and characterized in that a fan wheel driven by said motor is disposed on the side of said motor opposite said pump, said fan wheel directing a cooling air stream over said motor casing, and that said fan wheel and cooling surfaces of said motor are dimensioned such that adequate cooling of said motor is achieved by the fan air cooling alone when the flow rate of cleaning fluid from said pump to the cleaning apparatus is zero.
Claim 3
Dependent Claim
32 words
A motor-driven pump unit as set forth in claim 1 wherein said motor casing has a part thereof remote from said fan wheel and cleaning fluid is conveyed only through said part.
Claim 4
Dependent Claim
41 words
A motor-driven pump unit as set forth in claim 1, wherein said motor casing has a wall defining a duct which surrounds a stator of said motor in a helical manner in order to convey cleaning fluid through said motor casing.
Claim 5
Dependent Claim
26 words
A motor-driven pump unit as set forth in claim 3, wherein a steel tube which is embedded in said wall of said casing defines said duct.
Claim 6
Dependent Claim
22 words
A motor-driven pump unit as set forth in claim 4, wherein said wall of said casing is formed as an aluminum die-casting.
Claim 7
Dependent Claim
22 words
A motor-driven pump unit as set forth in claim 1, wherein said motor defines an interior space which is filled with oil.
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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) | 1987-11-06 | 1988-05-07 | 1988-11-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-11-06 | 1992-05-07 | 1992-11-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-11-06 | 1996-05-07 | 1996-11-06 | $7700.00 | Window Closed / Lapsed |