US3796509A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Scroll washer for centrifugal fans
Assignee: AMERICAN DAVIDSON Inc
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Filing: 1972-05-10
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Granted: 1974-03-12
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Expires: 1992-05-10
Abstract
Abstract This invention relates to a centrifugal fan having a rotating fan wheel and means for removing centrifuged particulate matter from the interior wall of the fan scroll. A conduit, capable of carrying a fluid under pressure, is provided with a plurality of perforations so that jets of water may be applied to the inside surface of the scroll to dislodge and maintain the particulate matter in a fluidized state to enable the matter to be removed from the scroll by a suitable drain. The conduit is disposed adjacent the inner surface of the scroll and aligned substantially transversely with respect to the direction of rotation of the fan wheel.
Inventors
- 👤 C Wood
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 17:55
CPC Classifications
F; F04; F04D; F04D29/00; F04D29/70; F04D29/701; F04D29/705
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
138 words
A centrifugal fan having a scroll member against the interior surface of which particulate matter may be centrifuged, said scroll having a finite width defined along a length, a fan wheel supported for rotation by a shaft, said shaft extending axially in the direction of said scroll width, and a conduit capable of transporting a fluid under pressure, said conduit disposed adjacent the inner surface of said scroll and having means whereby said fluid may be jetted in the direction of rotation of said fan wheel with sufficient force against said interior surface to dislodge the centrifuged particulate matter therefrom and to thereby maintain said matter in a fluidized state, said conduit being aligned generally in the same direction as said fan wheel shaft and substantially transversely with respect to the direction of rotation of said fan wheel.
Claim 2
Dependent Claim
138 words
A centrifugal fan having a scroll member against the interior surface of which particulate matter may be centrifuged, said scroll having a finite width defined along a length, a fan wheel supported for rotation by a shaft, said shaft extending axially in the direction of said scroll width, and a conduit capable of transporting a fluid under pressure, said conduit disposed adjacent the inner surface of said scroll and having means whereby said fluid may be jetted in the direction of rotation of said fan wheel with sufficient force against said interior surface to dislodge the centrifuged particulate matter therefrom and to thereby maintain said matter in a fluidized state, said conduit being aligned generally in the same direction as said fan wheel shaft and substantially transversely with respect to the direction of rotation of said fan wheel.
Claim 3
Dependent Claim
24 words
The invention of claim 1, wherein the scroll of said fan has a cut-off and said fluid carrying conduit is disposed near said cut-off.
Claim 4
Dependent Claim
16 words
The invention of claim 1, wherein said conduit is a pipe cut-off for said fan scroll.
Claim 5
Dependent Claim
26 words
The invention of claim 1, wherein said fluid carrying conduit is extended axially and completely through said fan scroll in the direction of said scroll width.
References Cited (Backward Citations)
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US2288734A
Cited
US2050523A
Cited
US2372538A
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US2598032A
Cited
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Cited
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Cited
US3678659A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-03-11 | 1977-09-10 | 1978-03-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-11 | 1981-09-10 | 1982-03-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-11 | 1985-09-10 | 1986-03-12 | $7700.00 | Window Closed / Lapsed |