US3924964A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Axial flow fan apparatus
Assignee: Trane US Inc
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Filing: 1974-12-23
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Granted: 1975-12-09
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Expires: 1994-12-23
Abstract
Abstract A vane axial flow fan is shown having a shroud construction which provides greater than normal rigidity in the areas coextensive with the stator vanes and fan wheel blades. These areas of the shroud are formed as metal spinnings to permit unusually deep flanges with well-rounded transition areas to reduce turbulence of the fluid stream passing around them as it passes through the fan. The fan shroud is disposed within a rectangular cage formed of interconnected axially extending and tangentially extending angle bars. The tangentially extending bars are directly connected to the flanges of the fan shroud.
Inventors
- 👤 Ronald J Lievens
- 👤 Richard W Kabat
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 05:47
CPC Classifications
F; F04; F04D; F04D29/00; F04D29/40; F04D29/52; F04D29/522; F04D29/526
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
142 words
An axial flow fan including a shroud having: a first annular channel member of U-shaped cross section having a substantially circular axially extending first web disposed intermediate first and second radially outwardly extending flanges; a second annular channel member of U-shaped cross section having a substantially circular axially extending second web disposed intermediate first and second radially outwardly extending flanges; a third annular channel member of U-shaped cross section having a substantially circular axially extending third web disposed intermediate first and second radially extending flanges, said first and second webs being of a diameter less than the diameter of said third web, said third channel member being disposed axially intermediate said first and second channel members in co-axial flange-to-flange facing relationship; and means for fixedly connecting the adjacent facing flanges of said first and third and said second and third channel members.
Claim 2
Dependent Claim
142 words
An axial flow fan including a shroud having: a first annular channel member of U-shaped cross section having a substantially circular axially extending first web disposed intermediate first and second radially outwardly extending flanges; a second annular channel member of U-shaped cross section having a substantially circular axially extending second web disposed intermediate first and second radially outwardly extending flanges; a third annular channel member of U-shaped cross section having a substantially circular axially extending third web disposed intermediate first and second radially extending flanges, said first and second webs being of a diameter less than the diameter of said third web, said third channel member being disposed axially intermediate said first and second channel members in co-axial flange-to-flange facing relationship; and means for fixedly connecting the adjacent facing flanges of said first and third and said second and third channel members.
Claim 3
Dependent Claim
32 words
The axial flow fan as defined by claim 1 further including an axial flow fan wheel having circumferentially spaced radially outwardly extending blades disposed in axially co-extensive relationship with said first web.
Claim 4
Dependent Claim
44 words
The axial flow fan as defined by claim 2 further including a plurality of circumferentially spaced stator vanes extending radially inwardly of said second web; and a centrally disposed diffuser core spaced radially inwardly of and axially co-extensive with said second and third webs.
Claim 5
Dependent Claim
35 words
The axial flow fan as defined by claim 3 further including means for rigidly fastening said stator vanes at their radially outer ends to said second web and their radially inner ends to said core.
Claim 6
Dependent Claim
56 words
The axiaL flow fan as defined by claim 4 further including a rotatable shaft; means fixedly mounting said fan wheel to said shaft for rotation therewith; bearing means disposed radially inwardly of said core for rotatably supporting said shaft; and bearing support means including said stator blades and said second web for supporting said bearing means.
Claim 7
Dependent Claim
60 words
The axial flow fan as defined by claim 1 further including a rectangular shroud support cage disposed about said shroud including a plurality of axially extending support bars and a plurality of tangentially extending support bars fixedly connected to each other; and means directly fixedly connecting at least some of said annular channel flanges to said tangentially extending support bars.
Claim 8
Dependent Claim
70 words
The axial flow fan as defined by claim 1 wherein the transitions between the web and flanges of said first and second channel members have a radii of curvature greater than 0.01 times the diameters of said first and second webs respectively and the transition between the web and flanges of said third channel member has a radius of curvature less than 0.01 times the diamter of said third web.
Claim 9
Dependent Claim
28 words
The axial flow fan as defined by claim 7 wherein said first and second channel members are metallic spinnings and said third channel member is a rolled annulus.
References Cited (Backward Citations)
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US2031688A
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US2191341A
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US2410450A
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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) | 1978-12-08 | 1979-06-09 | 1979-12-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-08 | 1983-06-09 | 1983-12-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-08 | 1987-06-09 | 1987-12-09 | $7700.00 | Window Closed / Lapsed |