US3619088A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Single inlet centrifugal fan
Assignee: Carrier Corp
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Filing: 1970-02-17
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Granted: 1971-11-09
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Expires: 1990-02-17
Abstract
Abstract The invention relates to single inlet centrifugal blowers or fans. The fan is of less axial length than the width of the housing. The rear closed end wall of the housing confronting the backwall of the fan is provided with an inwardly extending cylindrical surface of substantially the same diameter as the fan and terminating in close spatial relation to the backwall of the fan. The cylindrical surface may be formed integral with the closed housing wall, or as a separate piece attached to the housing wall, or as part of the motor mount. The cylindrical surface serves to direct secondary rotational airflow from the space or cavity between the fan backplate and the rear wall of the housing.
Inventors
- 👤 Charles E Bullock
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 12:03
CPC Classifications
F; F04; F04D; F04D29/00; F04D29/26; F04D29/28; F04D29/281; F04D29/282; F04D29/40; F04D29/42; F04D29/4206; F04D29/4226
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
150 words
A centrifugal single inlet fan structure comprising a housing having a rear closed end wall and an inlet end wall formed with an inlet opening, a fan journaled for rotation in said housing intermediate said walls, said walls being spaced apart a distance greater than the axial length of said fan, a motor operatively connected to said fan for effecting rotation thereof, said rear wall being formed with a first integral radially inwardly extending central portion offset axially from the plane of said wall, a motor support member of circular form fixed at its periphery to said rear wall and being formed with a radially inwardly extending central portion formed complemental to said central first portion and being spaced axially from said first portion, said central portions being formed with aligned apertures, said motor being mounted between said portions, the ends of said motor being fixedly mounted in said apertures.
Claim 2
Dependent Claim
150 words
A centrifugal single inlet fan structure comprising a housing having a rear closed end wall and an inlet end wall formed with an inlet opening, a fan journaled for rotation in said housing intermediate said walls, said walls being spaced apart a distance greater than the axial length of said fan, a motor operatively connected to said fan for effecting rotation thereof, said rear wall being formed with a first integral radially inwardly extending central portion offset axially from the plane of said wall, a motor support member of circular form fixed at its periphery to said rear wall and being formed with a radially inwardly extending central portion formed complemental to said central first portion and being spaced axially from said first portion, said central portions being formed with aligned apertures, said motor being mounted between said portions, the ends of said motor being fixedly mounted in said apertures.
Claim 3
Dependent Claim
25 words
A centrifugal fan structure as set forth in claim 1 wherein said motor support member is attached to the outer surface of said rear wall.
Claim 4
Dependent Claim
25 words
A centrifugal fan structure as set forth in claim 1 wherein said motor support member is attached to the inner surface of said rear wall.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-11-08 | 1975-05-10 | 1975-11-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-08 | 1979-05-10 | 1979-11-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-08 | 1983-05-10 | 1983-11-09 | $7700.00 | Window Closed / Lapsed |