U.S. patent application number 14/047589 was filed with the patent office on 2014-06-26 for wind power plant.
This patent application is currently assigned to Agile Wind Power AG. The applicant listed for this patent is Agile Wind Power AG. Invention is credited to Karl Bahnmuller, Patrick Richter.
Application Number | 20140178216 14/047589 |
Document ID | / |
Family ID | 40853496 |
Filed Date | 2014-06-26 |
United States Patent
Application |
20140178216 |
Kind Code |
A1 |
Richter; Patrick ; et
al. |
June 26, 2014 |
Wind Power Plant
Abstract
The invention relates to a wind power plant, comprising a rotor
that can be rotated about a vertical axis, said rotor between two
horizontal bearing planes disposed at a distance on top of each
other comprising a plurality of rotor blades, which are disposed
distributed on a circumferential circle, can each be pivoted about
a vertical pivot axis, and the pivot range of which is delimited on
both sides by a stop. In such a wind power plant, an improvement in
the energy yield, while simultaneously ensuring another operation,
is enabled in that the width of the rotor blades is smaller than
approximately 1/3 the radius of the circumferential circle.
Inventors: |
Richter; Patrick; (Zurich,
CH) ; Bahnmuller; Karl; (Dietikon, CH) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
Agile Wind Power AG |
Dubendorf |
|
CH |
|
|
Assignee: |
Agile Wind Power AG
Dubendorf
CH
|
Family ID: |
40853496 |
Appl. No.: |
14/047589 |
Filed: |
October 7, 2013 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
|
|
12811133 |
Jun 29, 2010 |
8552579 |
|
|
PCT/CH2008/000549 |
Dec 24, 2008 |
|
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14047589 |
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Current U.S.
Class: |
417/405 ;
416/101 |
Current CPC
Class: |
Y02E 10/74 20130101;
F03D 3/02 20130101; F03D 13/20 20160501; Y02E 60/16 20130101; F03D
3/067 20130101; Y02E 60/15 20130101; F03D 9/28 20160501; F03D 9/17
20160501 |
Class at
Publication: |
417/405 ;
416/101 |
International
Class: |
F03D 3/06 20060101
F03D003/06; F03D 9/02 20060101 F03D009/02; F03D 9/00 20060101
F03D009/00 |
Foreign Application Data
Date |
Code |
Application Number |
Jan 4, 2008 |
CH |
8/08 |
Claims
1. A wind power installation comprising: at least one rotor which
can rotate about a vertical axis and, between two horizontal
mounting planes, which are located one above the other and
separated, and a plurality of rotor blades, which are arranged
distributed on a circumferential circle and can each pivot about a
vertical pivoting axis, and whose pivoting range is bounded at both
ends by a stop, wherein the width of the rotor blades is less than
approximately 1/3 of the radius of the circumferential circle.
2. The wind power installation as claimed in claim 1, wherein
twelve or more rotor blades are arranged such that they can pivot
on the circumferential circle of the rotor.
3. The wind power installation as claimed in claim 1, wherein the
rotor blades are in the form of straight blades.
4. The wind power installation as claimed in claim 3, wherein the
rotor blades each have a leading edge and a trailing edge, and have
a reduced thickness between the leading edge and the trailing
edge.
5. The wind power installation as claimed in claim 1, wherein the
pivoting range of the rotor blades is in each case limited to an
angle of about 100.degree.-115.degree..
6. The wind power installation as claimed in claim 5, wherein, in
one limit position of the pivoting range, the rotor blades each
include an angle of about 50.degree. with the radius vector of the
circumferential circle which passes through the pivoting axis, and,
in the other limit position of the pivoting range, include an angle
of about 150.degree.-165.degree..
7. The wind power installation as claimed in claim 4, wherein the
pivoting axes of the rotor blades are arranged within the rotor
blades, in the vicinity of, but at a distance from, the leading
edge.
8. The wind power installation as claimed in claim 7, wherein the
pivoting range of the rotor blades is in each case defined by a
single stop which is arranged within the circumferential
circle.
9. The wind power installation as claimed in claim 4, wherein the
pivoting axes of the rotor blades are arranged in the leading edges
of the rotor blades.
10. The wind power installation as claimed in claim 9, wherein the
pivoting range of the rotor blades is in each case defined by a
limiting element which is in the form of a circular arc,
concentrically surrounds the pivoting axis, and whose ends each
form a stop.
11. The wind power installation as claimed in claim 1, wherein the
mounting planes are formed by spoked wheels which rotate about the
axis.
12. The wind power installation as claimed in claim 1, wherein the
wind power installation has a plurality of rotors which are
arranged at different heights.
13. The wind power installation as claimed in claim 12, wherein the
rotors are arranged one above the other and rotate about the same
axis.
14. The wind power installation as claimed in claim 13, wherein the
rotors can rotate independently of one another.
15. The wind power installation as claimed in claim 1, wherein the
rotor blades have an aerodynamic cross-sectional profile with a
pointed end and a round end.
16. The wind power installation as claimed in claim 15, wherein the
pivoting axes of the rotor blades are arranged within the rotor
blades in the vicinity of, but at a distance from, the round end,
and wherein the pivoting range of the rotor blades is in each case
defined by a single stop which is arranged within the rotor blade,
rotationally fixed with respect to the pivoting axis.
17. The wind power installation as claimed in claim 1, wherein the
rotor drives at least one compressor via a power transmission, the
compressor sucks in air on the input side and is connected on the
output side to a compressed-air reservoir, and wherein a turbine
can be connected to the compressed-air reservoir and drives a
generator in order to produce electricity.
18. The wind power installation as claimed in claim 17, wherein the
rotor can be selectively connected to a plurality of compressors
via power transmission.
19. The wind power installation as claimed in claim 17, wherein the
compressed-air reservoir is incorporated in the ground, and forms
the foundation of the wind power installation arranged above
it.
20. The wind power installation as claimed in claim 15, wherein the
aerodynamic cross-sectional profile is in the form of a stretched
droplet.
Description
CROSS REFERENCE TO RELATED APPLICATIONS
[0001] This application is a continuation of U.S. application Ser.
No. 12/811,133, filed Jun. 29, 2010, which is the United States
national phase of International Application No. PCT/CH2008/000549,
filed Dec. 24, 2008, which claims the benefit of Swiss Patent
Application No. CH 8/08, filed Jan. 4, 2008. The disclosure of each
of these documents is hereby incorporated in its entirety by
reference.
BACKGROUND OF THE INVENTION
[0002] 1. Technical Field
[0003] The present invention relates to the field of alternative
energy production by means of wind power.
[0004] 2. Description of Related Art
[0005] Wind power installations, that is to say installations for
obtaining (electrical) energy from the wind, have been known for a
long time in widely differing forms and embodiments. One
fundamental distinguishing feature between such wind power
installations, which normally have a rotor which rotates about a
rotation axis, is the spatial arrangement of the rotation axis: in
the case of so-called vertical rotors, the rotor rotates about a
vertical axis, while in the case of horizontal rotors, the rotor
rotates about a horizontal rotation axis. Vertical rotors, which
also include the wind power installation according to the present
invention, have the particular advantage over horizontal rotors
that they do not need to be adjusted for a specific wind
direction.
[0006] In principle, the power contained in the wind at a wind
speed v is proportional to the cube of the wind speed v. The power
extracted by the wind power installation increasingly reduces the
wind speed. In the extreme (v.fwdarw.0), the power extracted tends
to 0, because there is no longer any flow through the rotor. There
is therefore a maximum possible power that can be extracted, which
is about 60% of the power contained in the wind.
[0007] The power which can be extracted from the wind is governed
in particular by the nature of the rotor: the rotors of wind power
installations are equipped with rotor blades on which two types of
forces can act in the wind flow, specifically a force in the flow
direction caused by the drag of the rotor blade and a lift force
which acts transversely with respect to the flow direction, for
example as is used in the case of aircraft wings.
[0008] The present invention relates to wind power installations
which are based mainly or exclusively on the drag (drag rotors).
They are distinguished by a high rotor torque which is available
even during starting. WO A2-2005/046638 discloses a wind power
installation which is in the form of a vertical rotor based on the
drag principle and can have a number of stages in height. This wind
power installation has the disadvantage that a comparatively small
number of broad rotor blades are used, which can be pivoted only in
a very restricted pivoting range of about 45.degree. about their
pivoting axis. In consequence, the energy obtained is not optimal.
At the same time, its structure is considerably loaded by the
pivoting movements and must be designed to be particularly
robust.
[0009] JP-A-2005188494 discloses a wind power installation which is
in the form of a vertical rotor based on the drag principle or the
lift principle and whose rotor blades admittedly have a pivoting
range of up to 180.degree., but whose rotor blades are so broad
that only a small number (four or six) can be arranged on the
circumferential circle which is provided for the pivoting axes. In
this case as well, the yield is not optimal, and the rotor running
is particularly rough, and subject to large disturbance forces.
SUMMARY OF THE INVENTION
[0010] The object of the invention is therefore to design a wind
power installation of the type mentioned initially which avoids the
disadvantages of known installations and results in more energy
being obtained while at the same time decreasing the mechanical
load on the structure. In one embodiment, the width of the rotor
blades is chosen to be small, and is less than approximately 1/3 of
the radius of the circumferential circle. The narrow rotor blades
result in various advantages: [0011] More rotor blades with a
comparatively large pivoting range can be arranged on the
circumferential circle, which more effectively convert, and
therefore utilize, the wind flow passing through the rotor volume
to torque. [0012] The load on the individual rotor blades is less,
as a result of which they can pivot more easily to the optimum
position, and produce reduced disturbance forces during pivoting
and when striking the limit stops of the pivoting range. [0013] If
the wind pressure on the rotor blades is not reduced by reducing
the width, the rotor blades can be made longer (in the vertical
direction) in order to achieve the same rotor area. The torque is
thus increased in comparison to broad rotor blades, because the
blade area is located further outward, overall. [0014] The pivoting
processes of the rotor blades are distributed between considerably
more pivoting axes on the circumferential circle, which leads to
smoother running of the rotor and to a reduced load on the bearings
and on the load-bearing structure.
[0015] One preferred refinement of the invention is distinguished
in that twelve or more rotor blades are arranged such that they can
pivot on the circumferential circle of the rotor.
[0016] The installation design is particularly simple if the rotor
blades are in this case in the form of straight blades. Dispensing
with an airfoil profile or the like for the rotor blades
considerably simplifies production, and thus reduces the production
costs.
[0017] If, according to another refinement, the rotor blades each
have a leading edge and a trailing edge, and have a reduced
thickness between the leading edge and the trailing edge, the
weight of the rotor blades and the magnitude of the disturbance
forces produced by them can be further reduced without adversely
affecting robustness.
[0018] If, on the other hand, the rotor blades have an aerodynamic
cross-sectional profile, preferably in the form of a stretched
droplet, with a pointed end and a round end, the rotor blades
encounter less drag in the wind during their movement against the
wind, thus increasing the overall power yield of the
installation.
[0019] The pivoting range of the rotor blades is preferably in each
case limited to an angle of about 100.degree.. This allows optimum
matching of the rotor blades to the respective rotor position
without any excessive forces occurring on striking the limit points
of the pivoting range.
[0020] It is particularly advantageous when, according to another
refinement of the invention, in one limit position of the pivoting
range, the rotor blades each include an angle of about 50.degree.
with the radius vector of the circumferential circle which passes
through the pivoting axis, and, in the other limit position of the
pivoting range, include an angle of about 150-165.degree..
[0021] One simple option for defining the pivoting range consists
in that the pivoting axes of the rotor blades are arranged within
the rotor blades, in the vicinity of, but at a distance from, the
leading edge, and in that the pivoting range of the rotor blades is
in each case defined by a single stop which is arranged within the
circumferential circle.
[0022] However, it is also feasible for the pivoting axes of the
rotor blades to be arranged in the leading edges of the rotor
blades, and for the pivoting range of the rotor blades to be
defined in each case by a limiting element which is in the form of
a circular arc, concentrically surrounds the pivoting axis, and
whose ends each form a stop.
[0023] If the aim is to design the installation to be particularly
lightweight, it is advantageous for the mounting planes to be
formed by spoked wheels which rotate about the axis.
[0024] In order to ensure that the wind pressure on the individual
rotor blades does not become excessive, it is expedient for the
wind power installation to have a plurality of rotors which are
arranged at different heights. This can be done without consuming a
relatively large area, by arranging the rotors one above the other,
and by them rotating about the same axis.
[0025] In particular, in this case, different wind speeds can be
utilized better at different heights, if the rotors can rotate
independently of one another.
[0026] If the rotor blades have an aerodynamic cross-sectional
profile, preferably in the form of a stretched droplet, with a
pointed end and a round end, it is advantageous for the pivoting
axes of the rotor blades to be arranged within the rotor blades in
the vicinity of, but at a distance from, the round end, and for the
pivoting range of the rotor blades each to be defined by a single
stop which is arranged within the rotor blade, rotationally fixed
with respect to the pivoting axis.
[0027] The power can be tapped off in a particularly simple and
advantageous manner if the rotor drives at least one compressor via
a power transmission, which compressor sucks in air on the input
side and is connected on the output side to a compressed-air
reservoir, and in that a turbine can be connected to the
compressed-air reservoir and drives a generator in order to produce
electricity.
[0028] For better matching to different wind strengths, it is
advantageous if the rotor can be selectively connected to a
plurality of compressors via power transmission. When the wind
strength rises, compressors can be additionally connected in order
to process the additional power, and vice versa.
[0029] The wind power installation is particularly compact if the
compressed-air reservoir is incorporated in the ground, and forms
the foundation of the wind power installation arranged above
it.
DESCRIPTION OF THE DRAWINGS
[0030] The invention will be explained in more detail in the
following text with reference to exemplary embodiments and in
conjunction with the drawing, in which:
[0031] FIG. 1 shows a highly simplified schematic illustration of a
wind power installation in the form of a vertical rotor, based on
the drag principle, with two rotors one above the other, as is
suitable for implementation of the invention;
[0032] FIG. 2 shows a plan view from above of the rotor of a wind
power installation according to one exemplary embodiment of the
invention;
[0033] FIG. 3 shows an illustration, comparable to FIG. 2, of a
detail of the rotor of a wind power installation according to
another exemplary embodiment of the invention;
[0034] FIG. 4 uses various sub-figures 4(a) to 4(c) to show various
positions of a rotor blade in the rotor as shown in FIG. 3;
[0035] FIG. 5 shows the variables which occur in a rotor as shown
in FIG. 2;
[0036] FIG. 6 shows, in detail, the design of a rotor as shown in
FIG. 2 with a spoked wheel for the rotor blades to be mounted on,
according to another exemplary embodiment of the invention, with
the rotor blade located at one end of the pivoting range;
[0037] FIG. 7 shows the rotor shown in FIG. 6 with the rotor blade
at the other end of the pivoting range;
[0038] FIG. 8 uses an illustration comparable to FIG. 2 to show a
rotor with aerodynamically shaped rotor blades and angle ranges
extended in this way;
[0039] FIG. 9 shows an enlarged individual illustration of a rotor
blade from FIG. 8;
[0040] FIG. 10 shows the side view (FIG. 10a) and an axial viewing
direction of a wind power installation according to another
exemplary embodiment of the invention with compressed-air storage;
and
[0041] FIG. 11 shows a highly simplified installation layout for
the installation shown in FIG. 10.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
[0042] FIG. 1 shows a highly simplified schematic illustration of a
wind power installation in the form of a vertical rotor based on
the drag principle and having two rotors one above the other, as is
suitable for implementation of the invention. The wind power
installation 10 has a vertical axis 11 about which two rotors 12
and 12' rotate. Further rotors may, of course, also be provided,
which rotate about the axis 11. However, it is just as possible to
provide only a single rotor 12. The rotor or rotors 12, 12' is or
are connected via a shaft 16 to a generator unit 17, which can also
contain a gearbox in order to change the rotation speed. Instead of
the shaft 16, a shaft train comprising a plurality of individual
shafts located concentrically one inside the other can be provided,
via which the individual rotors 12, 12' are coupled to the
generator unit 17 independently of their rotation. This is
particularly advantageous when the aim is to optimally tap off flow
strata with different wind speeds by means of rotors 12, 12'
located at different heights.
[0043] Each of the rotors 12, 12' is equipped with a plurality of
vertically arranged rotor blades 15 which are mounted in a
distributed manner, such that they can pivot, on a circumferential
circle between a lower mounting plane 14 and an upper mounting
plane 13. For the sake of simplicity and clarity, only the front
rotor blades are in each case shown in FIG. 1. FIG. 2 shows a plan
view from above of a rotor 12 according to one preferred exemplary
embodiment of the invention, showing the interaction of the rotor
12 and of the rotor blades 15 accommodated therein, with an air
flow (wind) 20. The upper mounting plane 13 is in this case omitted
in order to allow the rotor blades 15 to be seen without any
impediment. Overall, twelve rotor blades 15 are arranged
distributed uniformly on the circumferential circle 27 and can each
pivot about a vertical pivoting axis 18. The pivoting range of each
rotor 15, which is shown in detail in FIGS. 5 and comprises an
angle .beta. of about 100.degree. to 115.degree., is in each case
bounded by a single stop 19 which is in the form of a post and is
placed a short distance away from the pivoting axis 18 within the
circumferential circle 27.
[0044] Each rotor blade 15 is straight and has a leading edge 25
and a trailing edge 26 (FIG. 7). The pivoting axes 18 of the rotor
blades 15 are arranged within the rotor blades 15, in the vicinity
of, but at a distance from, the leading edge 25. At one limit
position of the pivoting range (FIG. 6), that section of the rotor
blade which is located between the pivoting axis 18 and the leading
edge 25 pivots against the stop 19. In the other limit position
(FIG. 7), that section of the rotor blade 15 which is located
between the pivoting axis 18 and the trailing edge 26 pivots
against the stop 19. As can be seen from FIG. 5, in one limit
position of the pivoting range (.beta.), the rotor blades 15 each
include an angle .alpha. of about 50.degree. with the radius vector
of the circumferential circle 27 which passes through the pivoting
axis 18, and in the other limit position of the pivoting range
(.beta.), include an angle 180.degree.-.gamma. of about 150.degree.
to 165.degree..
[0045] In another refinement, which is shown by way of example in
FIGS. 3 and 4, the pivoting axes 18 of the rotor blades 15 are
arranged directly in the leading edges 25 of the rotor blades 15.
In this case, the pivoting range (.beta.) of the rotor blades 15 is
in each case defined by a limiting element 21 which is in the form
of a circular arc and concentrically surrounds the pivoting axis
18, and whose ends each form a stop 22 and 23.
[0046] The comparatively narrow width b of the individual rotor
blades 15 is essential for the invention (FIG. 5). The width b is
less than approximately 1/3 of the radius R of the circumferential
circle 27. This allows a comparatively large number of rotor blades
15 to be accommodated on the circumferential circle 27 without
having to limit the pivoting range to do so. The interaction of the
rotor 12 and of the rotor blades 15 with the air flow is thus
subdivided to a greater extent, thus leading to better utilization
in the volume, and to smoother running.
[0047] The size and position of the pivoting range of the rotor
blades as shown in FIG. 5 are also important. When the rotor 12 is
revolving in the clockwise direction as shown in FIG. 2 and with
the wind direction shown there, this results in changing rotor
blade positions, which can be subdivided into and associated with
different angle ranges A to D: in a first angle range A, which can
be referred to as the drive range, the rotor blades 15 rest on the
stop 19 and are positioned transversely with respect to the air
flow 20, thus resulting in a driving torque. In the angle range B,
the situation with respect to the position of the rotor blade 15 is
unstable, because this is where the blade starts to separate from
the stop 19. In the angle range C, the rotor blade 15 pivots
outward and strikes against the stop 19 from the other side. Once
again, this results in a driving torque. Because of the effect of
the air flow 20, a driving torque is also applied in an additional
drive range (angle range D) as a result of the chosen position of
the pivoting range (see also FIGS. 4a and 4b) until, later, the
rotor blade is separated from the stop 19 and is positioned
parallel to the air flow (right-hand side of FIG. 2 and FIG. 3) in
order to enter the angle range A again even later (see also FIG.
4c).
[0048] The energy in the air flow 20 is utilized optimally by the
position and size of the pivoting range of the rotor blades. The
splitting of the total rotor blade area between a multiplicity of
comparatively narrow rotor blades 15 also contributes to this. This
splitting at the same time results in the rotor 12 running
smoothly, reducing the magnitude of the disturbance forces
associated with the pivoting. A further improvement can be achieved
if the thickness d of the rotor blades 15 is reduced in a center
area 24 between the leading edge 25 and the trailing edge 26 (FIG.
6). In addition to the weight saved in each rotor blade 15 by this
measure, further weight can be saved, without any loss of strength,
by forming the mounting planes 13, 14 by spoked wheels 28 which
rotate about the axis 11 (FIG. 6).
[0049] However, instead of the rotor blades 15 shown in FIGS. 6 and
7, it is also possible to use aerodynamically optimized rotor
blades 15' as shown in FIG. 9, which are distinguished by a
cross-sectional profile in the form of a stretched droplet with a
pointed end 29 and a round end 30. In this case, the pivoting axis
18 is arranged at the round end 30. A stop 31 is mounted in a
rotationally fixed manner within the rotor blade 15' and has two
stop surfaces 32 and 32' which are oriented at an acute angle to
one another. In one limit position of the pivoting range (as shown
in FIG. 9), one inner face of the rotor blade 15' rests on the
lower stop surface 32. In the other limit position, when the rotor
blade 15' has been pivoted about the pivoting axis 18 in the
counterclockwise direction, the other inner face of the rotor blade
15' rests on the upper stop surface 32'. The internal arrangement
protects the stop mechanism against external influences such as
icing, dirt or damage, and at the same time improves the
aerodynamics. When rotor blades 15' such as these and as shown in
FIG. 8 are installed in the rotor 12, this results in angle ranges
A and D which are larger than those shown in FIG. 2.
[0050] Since the wind does not blow uniformly and continuously at
many sites where wind power installations are installed, it is
advantageous for operational reasons to be able to store the energy
that is produced easily and effectively, and to withdraw the energy
from the storage again as required. The described rotor, which
emits a high torque from the start as a drag rotor, is particularly
highly suitable for operation of one or more compressors. When the
compressors are used to suck in air and compress it, the compressed
air that is produced can be stored in a compressed-air reservoir,
and can drive a turbine or a compressed-air motor, which produces
electricity via a flange-connected generator, as required. A wind
power installation such as this according to the invention with a
compressed-air reservoir is illustrated in the form of the
preferred physical embodiment in FIG. 10, and in the form of a
highly simplified installation layout in FIG. 11.
[0051] 25
[0052] In the case of the wind power installation 33 shown in FIG.
10, a compressed-air reservoir 40 in the form of a container,
composed of concrete by way of example, is introduced into the
ground. The compressed-air reservoir at the same time acts as a
foundation for the wind power installation built above it. Three
rotors or cells 35a, 35b and 35c are arranged one above the other
on a mast 45 with a vertical central axis 34 and are designed, for
example, as shown in FIG. 8. The mast 45 is anchored in a frame 37
which is built on the foundation, and is stabilized via a side guy
36. Power transmission 38, which is connected to the rotors 35a, b,
c, and is in the form of a wheel or turntable is arranged within
the frame 37, via which power transmission 38 compressors 39 which
are distributed on the circumference can be driven in a manner
which allows them to be connected selectively.
[0053] In the highly simplified installation layout shown in FIG.
11, the rotor 35 drives a compressor 39 via the power transmission
38, which compressor 39 sucks in air at the inlet, compresses it
and emits it at the outlet via a first controllable valve 43 to the
compressed-air reservoir 40. When it is intended to produce
electrical energy, compressed air is taken from the compressed-air
reservoir 40 via a second controllable valve 44, and is expanded in
a turbine 41 (or a compressed-air motor), in order to produce work.
The turbine 41 drives a generator 42 which produces three-phase
electricity and--after appropriate voltage and frequency
matching--emits it to a local or superordinate grid system. When
compressed air is stored and taken at the same time, the
compressed-air reservoir 40 is used, so to speak, as a "smoothing
capacitor".
[0054] The wind power installation 33 shown in FIG. 10 has an
overall height of, for example, 90 m, which is made up of 30 m for
the mast 45 and 60 m for the three rotors/cells 35a, b, c, with a
height of 20 m each. A mean wind speed of 5 m/s results in a power
of 44 kW being produced, corresponding to 1056 kWh of energy per
day. If the pressure reservoir 40 has a storage volume of 5000
m.sup.3, 1250 kWh can be stored in it at a pressure of 10 bar.
[0055] However, generators can also be arranged directly on the
power transmission 38 and produce electrical power directly when
required, without the interposition of the compressed-air
reservoir, thus allowing the installation to be operated
particularly flexibly, overall.
LIST OF REFERENCE SYMBOLS
[0056] 10, 33 Wind power installation
[0057] 11, 34 Axis (vertical)
[0058] 12, 12' Rotor
[0059] 13, 14 Mounting plane
[0060] 15, 15' Rotor blade (lamellar)
[0061] 16 Shaft
[0062] 17 Generator unit
[0063] 18 Pivoting axis (lamellar)
[0064] 19, 31 Stop
[0065] 20 Air flow (wind)
[0066] 21 Limiting element
[0067] 22, 23 Stop
[0068] 24 Center area (reduced thickness)
[0069] 25 Leading edge
[0070] 26 Trailing edge
[0071] 27 Circumferential circle
[0072] 28 Spoked wheel
[0073] 29, 30 End
[0074] 32, 32' Stop surface
[0075] 35 Rotor
[0076] 35a, 35b, 35c Rotor
[0077] 36 Guy
[0078] 37 Frame
[0079] 38 Power transmission
[0080] 39 Compressor
[0081] 40 Compressed-air reservoir (cavern)
[0082] 41 Turbine
[0083] 42 Generator
[0084] 43, 44 Valve
[0085] 45 Mast
[0086] A, . . . D Angle range
[0087] D1, D2 Diameter
[0088] d Thickness
[0089] b Width
[0090] R Radius (circumferential circle)
[0091] .alpha., .beta., .gamma. Angle
* * * * *