US4878805A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Blower for use in particle contaminated environments
Assignee: Sundstrand Corp
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Filing: 1988-10-20
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Granted: 1989-11-07
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Expires: 2008-10-20
Abstract
Abstract An impeller-type blower for use particularly in environments of particle contaminated air includes a housing defining an aft cavity. An impeller, including a shaft, is rotatably mounted in the housing by a bearing forward of the aft cavity. Passages communicate the aft cavity with a region forward of the bearing to provide a pressure balance on opposite sides of the bearing and, thereby, prevent particle contaminants from infiltrating the bearing.
Inventors
- 👤 Behzad Hagshenas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 23:47
CPC Classifications
F; F04; F04D; F04D29/00; F04D29/05; F04D29/056; F04D29/059; F04D29/051; F04D29/0516
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
87 words
An impeller-type blower for use particularly in environments of particle contaminated air, comprising: housing means defining an aft cavity; impeller means including shaft means rotatably mounted in the housing means by bearing means forward of the aft cavity for drawing the particle contaminated air from an inlet of housing means; and passage means communicating the aft cavity with a region forward of the bearing means to provide a pressure balance on opposite sides of the bearing means and thereby prevent particle contaminates from infiltrating the bearing means.
Claim 2
Dependent Claim
87 words
An impeller-type blower for use particularly in environments of particle contaminated air, comprising: housing means defining an aft cavity; impeller means including shaft means rotatably mounted in the housing means by bearing means forward of the aft cavity for drawing the particle contaminated air from an inlet of housing means; and passage means communicating the aft cavity with a region forward of the bearing means to provide a pressure balance on opposite sides of the bearing means and thereby prevent particle contaminates from infiltrating the bearing means.
Claim 3
Dependent Claim
14 words
The blower of claim 1 wherein said passage means extend through the shaft means.
Claim 4
Dependent Claim
32 words
The blower of claim 1 wherein seal means are provided about the bearing means, and one end of said passage age means is located near a forward part of the seal means.
Claim 5
Dependent Claim
14 words
The blower of claim 3 wherein said passage means extend through the shaft means.
Claim 6
Dependent Claim
71 words
In a blower for use particularly in environments of particle contamination, the blower including impeller means rotatably mounted in housing means by bearing means between two cavities on opposite sides of the bearing means for drawing the particle contaminated air from an inlet of housing means, the improvement comprising passage means communicating between said cavities to provide a pressure balance therebetween and thereby prevent particle contaminates from infiltrating the bearing means.
Claim 7
Dependent Claim
71 words
In a blower for use particularly in environments of particle contamination, the blower including impeller means rotatably mounted in housing means by bearing means between two cavities on opposite sides of the bearing means for drawing the particle contaminated air from an inlet of housing means, the improvement comprising passage means communicating between said cavities to provide a pressure balance therebetween and thereby prevent particle contaminates from infiltrating the bearing means.
Claim 8
Dependent Claim
26 words
In a blower as set forth in claim 5 wherein the impeller means include shaft means, and wherein said passage means pass through the shaft means.
Claim 9
Dependent Claim
32 words
In a blower as set forth in claim 6 wherein seal means are provided about the bearing means, and wherein said passage means is located near a part of the seal means.
Claim 10
Dependent Claim
26 words
In a blower as set forth in claim 7 wherein the impeller means include shaft means, and wherein said passage means pass through the shaft means.
Claim 11
Dependent Claim
69 words
A blower for use particularly in environments of particle contamination, comprising: housing means; impeller means rotatably mounted in the housing means by bearing means between two cavities for drawing the particle contaminated air from an inlet of housing means; and passage means communicating between said cavities on opposite sides of the bearing means to provide a pressure balance therebetween and thereby prevent particle contaminates from infiltrating the bearing means.
Claim 12
Dependent Claim
69 words
A blower for use particularly in environments of particle contamination, comprising: housing means; impeller means rotatably mounted in the housing means by bearing means between two cavities for drawing the particle contaminated air from an inlet of housing means; and passage means communicating between said cavities on opposite sides of the bearing means to provide a pressure balance therebetween and thereby prevent particle contaminates from infiltrating the bearing means.
Claim 13
Dependent Claim
21 words
The blower of claim 9 wherein said impeller means include shaft means and said passage means extend through the shaft means.
Claim 14
Dependent Claim
31 words
The blower of claim 9 wherein seal means are provided about the bearing means, and one end of said passage means is located near a forward part of the seal means.
Claim 15
Dependent Claim
21 words
The blower of claim 11 wherein said impeller means include shaft means and said passage means extend through the shaft means.
References Cited (Backward Citations)
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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) | 1992-11-06 | 1993-05-08 | 1993-11-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-11-06 | 1997-05-08 | 1997-11-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-11-06 | 2001-05-08 | 2001-11-07 | $7700.00 | Window Closed / Lapsed |