Patent US4565491A successfully refreshed from Google Patents.
US4565491A
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Propulsion installation of air-cushion transport vehicle
Assignee: DONETSKY NAUCHNO ISSLEDOVATELSKY INSTITUT KOMPLEXNOI MEKHANIZATS
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Filing: 1980-07-28
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Granted: 1986-01-21
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Expires: 2000-07-28
Abstract
Abstract There is provided a propulsion installation of an air-cushion transport vcle wherein an axial fan having working blades is installed in an annular duct; a ring slat is positioned before said annular duct so that said annular duct and said ring slat form therebetween an annular passage the exit of which is disposed ahead of said working blades installed in said annular passage is a vane cascade made up of curved plates, with a concave portion of each being directed toward a pressure side of said working blades.
Inventors
- 👤 Sergei K. Ivanov
- 👤 Viktor E. Dudkin
- 👤 Iosif A. Raskin
- 👤 Valery P. Peredery
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 17:13
CPC Classifications
F; F04; F04D; F04D29/00; F04D29/40; F04D29/52; F04D29/54; F04D29/541; B; B60; B60V; B60V1/00; B60V1/14; B63; B63H; B63H7/00; B63H7/02; F01; F01D; F01D5/00; F01D5/12; F01D5/14; F01D5/141; F01D5/145; F02; F02C; F02C7/00; F02C7/04; Y; Y02; Y02T; Y02T50/00; Y02T50/60; Y10; Y10S; Y10S415/00; Y10S415/913
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
168 words
A propulsion installation of an air-cushion transport vehicle, comprising: an annular duct; an axial fan with working blades installed in said annular duct which provides an area of elevated pressure in said annular duct at the discharge side of said axial fan; a ring slat disposed before said annular duct; an annular passage formed between said annular duct and said ring slat, with the exit of said annular passage being located ahead of said working blades and adjacent the peripheral portions thereof, and the inlet of said annular passage being outside the area of elevated pressure at the discharge side of said axial fan; a vane cascade positioned in said annular passage and made up of curved vanes, a concave portion of each one of which is directed toward a pressure side of the peripheral portions of said working blades, said vanes being oriented to impart a spin, in a direction opposite the direction of rotation of said working blades, to the air flow entering said annular passage.
Claim 2
Dependent Claim
168 words
A propulsion installation of an air-cushion transport vehicle, comprising: an annular duct; an axial fan with working blades installed in said annular duct which provides an area of elevated pressure in said annular duct at the discharge side of said axial fan; a ring slat disposed before said annular duct; an annular passage formed between said annular duct and said ring slat, with the exit of said annular passage being located ahead of said working blades and adjacent the peripheral portions thereof, and the inlet of said annular passage being outside the area of elevated pressure at the discharge side of said axial fan; a vane cascade positioned in said annular passage and made up of curved vanes, a concave portion of each one of which is directed toward a pressure side of the peripheral portions of said working blades, said vanes being oriented to impart a spin, in a direction opposite the direction of rotation of said working blades, to the air flow entering said annular passage.
Claim 3
Dependent Claim
35 words
A propulsion installation of an air-cushion transport vehicle according to claim 1, wherein a height of said annular passage at the exit comprises 5 to 15 percent of the inside diameter of said annular duct.
Claim 4
Dependent Claim
60 words
A propulsion installation of an air-cushion transport vehicle according to claim 1, wherein the ratio of the outside diameter of said ring slat to the outside diameter of said annular duct ranges from 0.9 to 1.1 while the ratio of the inside diameter of said ring slat to the inside diameter of said annular duct ranges from 1.0 to 1.1.
Claim 5
Dependent Claim
61 words
A propulsion installation of an air-cushion transport vehicle of claim 1 comprising: a ring slat which forms an annular passage between the outside of the ring slat and said annular duct and has a flow area inside of said ring slat, which communicates with said annular duct, wherein rotatable guide vanes are located in the flow area of said ring slat.
Claim 6
Dependent Claim
61 words
A propulsion installation of an air-cushion transport vehicle of claim 3 comprising a ring slat which forms an annular passage between the outside of the ring slat and said annular duct and has a flow area inside of said ring slat, which communicates with said annular duct, wherein rotatable guide vanes are located in the flow area of said ring slat.
References Cited (Backward Citations)
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Cited
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Cited
US2169232A
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GB540707A
Cited
US3307776A
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US3519367A
Cited
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Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-01-20 | 1989-07-22 | 1990-01-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-01-20 | 1993-07-22 | 1994-01-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-01-20 | 1997-07-22 | 1998-01-21 | $7700.00 | Window Closed / Lapsed |