Patent JPH0213068A successfully refreshed from Google Patents.
Patent US4302619A successfully refreshed from Google Patents.
US4550259A
Expired / Lapsed
US
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Device for converting wind energy into another form of energy
Assignee: TRANSINVEST BV
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Filing: 1983-07-20
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Granted: 1985-10-29
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Expires: 2003-07-20
Abstract
Abstract The invention relates to a device for converting wind energy into another form of energy comprising a plurality of propellers having equidirectional shafts, being arranged in a matrix and driving associated energy converters. The invention generally proposes to design a device of the kind set forth in a manner such that the occupation density is at least 0.4 propellers per square meter. By this step a device is obtained, whose propellers are so small that the profile can satisfy an ideal profile with great accuracy without excessive increase in production costs. Furthermore, the number of revolutions during normal operation may be very appreciably higher than that of a known device so that the device only produces hardly troublesome, rustling noise, the level of which depends on wind force and thrust loads do no longer occur.
Inventors
- 👤 Augustinus W. M. Bertels
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 23:57
CPC Classifications
F; F03; F03D; F03D1/00; F03D1/06; F03D1/0608; F03D1/02; F05; F05B; F05B2240/00; F05B2240/40; F05B2260/00; F05B2260/96; Y; Y02; Y02E; Y02E10/00; Y02E10/70; Y02E10/72; Y02P; Y02P70/00; Y02P70/50
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
163 words
A device for converting wind energy to mechanical energy, which comprises a rotatable driving shaft adapted to provide energy output, a propeller having a plurality of blades radiating from said shaft, each blade being of airfoil shape in cross section to define a rounded leading edge and a tapered trailing edge, each blade having an axis defined by the locii of points lying at the one quarter points of the chords of the airfoil which axis is curved from the root of the blade toward the tip in the direction of rotation, and the tip portion of each blade being displaced outwardly from the general plane of rotation in the direction of incident wind and said propeller having a power coefficient which does not become negative for any ratio λ=ΩR/V where Ω is the angular velocity of the propeller expressed in radians per second, R is the radius of the propeller in meters, and V is the wind velocity in meters per second.
Claim 2
Independent Claim
163 words
A device for converting wind energy to mechanical energy, which comprises a rotatable driving shaft adapted to provide energy output, a propeller having a plurality of blades radiating from said shaft, each blade being of airfoil shape in cross section to define a rounded leading edge and a tapered trailing edge, each blade having an axis defined by the locii of points lying at the one quarter points of the chords of the airfoil which axis is curved from the root of the blade toward the tip in the direction of rotation, and the tip portion of each blade being displaced outwardly from the general plane of rotation in the direction of incident wind and said propeller having a power coefficient which does not become negative for any ratio λ=ΩR/V where Ω is the angular velocity of the propeller expressed in radians per second, R is the radius of the propeller in meters, and V is the wind velocity in meters per second.
Claim 3
Dependent Claim
22 words
A device as claimed in claim 1 wherein the effective specific mass of the propeller is smaller than 2500 kgs/m 3 .
Claim 4
Dependent Claim
33 words
A device as claimed in claim 1 including measuring means for measuring wind velocity and angular velocity of the propeller and control means governed by said measuring means for controlling the ratio λ.
Claim 5
Dependent Claim
31 words
A device as claimed in claim 3 wherein said control means comprises a generator, driven by said propeller, with a variable power control to impose a variable load on the propeller.
Claim 6
Dependent Claim
40 words
A device as defined in claim 1 including at least one additional blade arranged along the trailing edge of at least one of said propeller blades to obtain an enlarged maximum angle of incidence with respect to local wind direction.
Claim 7
Dependent Claim
42 words
A device as claimed in claim 5 in which the propellers are in common rotatable about a vertical axis characterized in that the direction of rotation of one half number of propellers is opposite that of the other half number of propellers.
Claim 8
Independent Claim
26 words
A device as defined in any one of claims 1-5 wherein along a portion of each blade from the center of rotation the chord length decreases.
Claim 9
Dependent Claim
50 words
A device as defined in claim 7 wherein the chord length of each propeller blade decreases from the center of rotation to a point located between about 0.7 and 0.9 times the axial length from the center of rotation and thereafter increases in the direction of the free blade end.
Claim 10
Dependent Claim
23 words
A device as defined in claim 8 wherein the propeller has a diameter less than about √2.5 meters and a low specific mass.
Claim 11
Dependent Claim
19 words
A device as defined in claim 9 wherein said specific mass is less than 2,500 kg per cubic meter.
Claim 12
Dependent Claim
15 words
A device as defined in claim 10 wherein the propeller is formed of synthetic resin.
Claim 13
Dependent Claim
34 words
A device as defined in claim 11 wherein there are a plurality of said propellers disposed in an array thereof, the occupation density of said propellers being at least 0.4 propellers per square meter.
Claim 14
Dependent Claim
33 words
A device as defined in claim 12 wherein said array is rotatable about a vertical axis and said propellers are arranged to front the wind from a position located behind said vertical axis.
Claim 15
Dependent Claim
28 words
A device as defined in claim 13 wherein the direction of rotation of one half of the number of propellers is opposite to that of the other half.
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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) | 1988-10-28 | 1989-04-29 | 1989-10-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-10-28 | 1993-04-29 | 1993-10-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-10-28 | 1997-04-29 | 1997-10-29 | $7700.00 | Window Closed / Lapsed |