|Title of Invention||
"SYSTEM FOR GENERATING ENERGY"
|Abstract||System (1) for generating energy, primarily with the use of sea currents, comprising a rotation body (4) having a front inlet side (2) and a rear outlet side (3) and at least one the inlet side (2) with a generator (5) connecting transfer member (6) as well as a, from a substantially cylindrical waist portion (7) at least towards the inlet side extending conically and/or with bulb shape tapering portion (8, 9), characterized in that the waist portion does along its circumference exhibit adjacent to each other located turbine blades (10) which extends outwards in a radial direction being essentially shorter than the radius of the waist portion (7) and are adapted to maintain the rotation of the rotation body, the free front end of which is secured to the transfer member (9) to transfer a rotational movement to the generator (5).|
|Full Text||The present invention relates to a system for generating energy, primarily with the aid of sea currents, and comprising a rotation body having a front inlet side and a rear outlet side, and at least one transfer member connecting the inlet side with the generator.
The prior art methods and systems intended to generate energy with the aid of i.e. seawater have turned out to require high costs. Also, their efficiency has been low inter alia because the energy generated with use of those systems has often been insufficient with regard.to the investment costs.
The object of the present invention is to establish a system for generating energy with the aid of, primarily, seawater current. It comprises a rotation body allowing production of significantly more energy than the amount previously possible to create. Thanks to the flexibility of ' this system it can' be located in such places in the sea where the sea currents are strongest. The features characterizing the invention are set out" in the claims.
Thanks to the invention there has now been provided a system which in an excellent way satisfies the purposes. Also, it can be manufactured conveniently and at a relatively low cost. According to the invention the system comprises a rotation body which constitutes the core of the invention and which is brought to rotate by the sea currents in which the system is localized.
The rotation of the rotation body can be optimized by adjustment of the angles of the blades which are oriented around the waist portion of the rotation body. The rotation body is retained in its level in the sea with the aid of transfer members which also transfer the rotation movement to a generator. Due to the spe-
cial shape of the rotation body Very high efficiency is obtained
relating to the conversion of slow flows consisting of a large
water volume. The transfer of the rotation of energy from the
rotation body takes place by means of the transfer member to a
generator, either for direct transfer of generated electric energy
or for storing of that energy. The system includes a pump
or a compressor which keeps the rotation body in the correct
power generation position in combination with the blades on the
circumference of the body. Said pump or compressor is used to
adjust the degree to which the rotation body is filled with i.e.
water which does per se influence the rotation position of the
body in the sea. In order to eliminate the friction of the fluid
which is inside the rotation body and determine its filling degree
the inner side of the rotation body is provided with internally
oriented blades which cause the fluid inside to rotate together
with the rotation body instead of creating a friction
against its inner walls. This arrangement means that the blades
do also function as ribs making all of the rotation body more
Some preferred embodiments of the invention are described below
with reference to the drawings.
Fig. 1 is a diagrammatic lateral view showing a system according
to the present invention,
Fig. 2 illustrates an alternative way to use the system according
to the invention,
Fig. 3 is a diagrammatic; cross sectional lateral view showing
a rotation body included in the system according
to the invention and rotationally supported inside a
nozzle-like, surrounding casing,
Fig. 4 is an end view of the rotation body and its casing
according to fig. 3,
• Fig. 5 is a diagrammatic lateral view of another embodiment
of the invention showing a rotation body having a
front inlet side with a conical portion and an outlet
side with a flat portion,
Fig. 6 is a diagrammatic view showing a rotation body included
in the system and illustrating how the height
position of the rotation body can be varied by variation
of the filling degree of the rotation body,
Fig. 7 is a cross sectional view through the waist portion
as seen towards its inlet side and illustrating the
Fig. B illustrates different designs of the inlet and outlet
sides of the rotation body, also showing the axial
and radial location of the blades at the waist portion
of the body,
Fig. 9 illustrates possible designs of the water inlet and
outlet side, respectively,
Fig. 10 is a diagrammatic lateral view showing a pivotable
transferring member for the rotating movement, which
eliminates the influence of the wave movements,
Fig. 11 shows a rigid, radial force transfer with the aid of
a transfer member including a pivotable coupling and
a current and an electric current generator mounted
inside the body, the transfer member being constituted
by a rigid transfer shaft,
Fig. 12 is a lateral view showing another embodiment according
to which the rotation body does around its waist
portion exhibit a truncated conical body, the oblique
lateral surfaces which converge towards the waist
portion and emerge therein via blades or wings around
the waist portion which are located at a predetermined
distance from each other,
Fig. 13 is an end view of the rotation body showed in fig.
Fig. 14 does diagrammatically show a rotation body according
to the invention and illustrates how the currents are
As appears from the drawing figures the invention is constituted
by a system 1 for producing energy with the aid of, primarily,
sea currents and comprising a rotation body 4 having a front
inlet side 2 and a rear outlet side 3 as well as at least one
transfer member 6 connecting the inlet side 2 with a generator
5. The transfer member 6 can be constituted by either a flexible
or a rigid shaft.
The rotation body 4 exhibits a tapered portion 8 extending from
a substantially cylindrical waist portion 7 towards the inlet
side 2 and being conical and/or bulb-shaped. The different
shapes of the rotation body 4 at the inlet side 2 and at the
outlet side 3, respectively, are shown more in detail in figs. 8
and 9. The bulb shape, the tunnel shape as well as the axial and
radial location of the blades making the body 4 to rotate are
designed to match the factors determined by the average flow,
the average temperature and the salt content and which have been
individually calculated for each selected mounting position. At
the rotation body 4 the streams are concentrated to its outer
diameter after which they converge to their original shape. For
that reason the blade height is calculated to match exactly that
fact. Suitable outlet shapes of the rotation body 4 are shown in
fig. B and also in fig. 9. The shapes have been, selected to create
a maximum efficiency in order to match the combined influence
of different density, salt content and current flow speed
The rotation body 4 does around its waist portion 7 exhibit
blades 10 interspaced at different distances and functioning to
maintain the rotation of the rotation body. The free, front end
of the rotation body 4 is connected to the transfer member 6 for
the purpose of transferring a rotation movement to the generator
5. The blades 10 can have adjustable attack angles so that they
can be turned to yield the highest possible output power.
According to an alternative embodiment, more in detail shown in
figs. 12 and 13, the waist portion 4 of the rotation body exhibits
a truncated, conical body 26 supported by blades or wings
10. Its converging sides 21, 28 are facing the waist portion 7
so as to create a tunnel-like formation 29 catching the sea currents
and directing towards the blades 10 through the intermediate
bases 30. According to the preferred embodiment the mounting
angle of the blades 10 can be about 45°. The power obtainable
thanks to the rotation of the rotation body can in that case be
increased by about 30 %.
For the orientation of the rotation body 4 in the sea the latter
comprises a fluid supply member 11, consisting of e.g. a pump or
a compressor, which keeps the body in the correct powerconsuming
position in combination with the above mentioned possibilities
to vary the blade angle at the intensity of the sea
currents. In order further to increase the effectiveness of the
rotation body the latter can be mounted in a nozzle-like casing
12 which could be shaped like a hour-glass and the walls of
which diverge from the tapered center section 13 of the casing
iix which the rotation body is rotatably supported in bearing-s 14
which are secured to the inlet 15 and the outlet 16, respectively,
of the casing 12. According to the embodiment shown casing
12 has a square cross section providing a larger area as
compared with a circular cross section and, consequently, a
maximum flow speed which in its turn to the rotation body 4 imparts
the highest possible rotation movement.
The external wall II of the rotation body 4 does on its inner
surface have blades 18 around the circumference for the purpose
of eliminating the friction generated by a fluid, for example
water, which is present inside the rotation body 4. At the same
time blades 18 serve as ribs which make the outer wall 17 of the
rotation body 4 stiff er. Thanks to this arrangement the water
filling up the interior of the rotation body 4 will participate
in the rotation movement.
Fig. 1 illustrates how a system 1 according to the invention can
be designed. In this case system 1 comprises an anchor member 20
which is resting on the sea bottom and from which extends a
chain 21 connected to a float member 22 which in its turn supports
an . accumulator 23 for the purpose of storing energy from
the rotation body 4 via the transfer member 6 and the generator
5 . Connected to the float member 22 is also a cable 24 which
when desired can be used to transport energy to the shore. Another
possibility is to transfer the energy stored in the accumulator
23 to different types of collection ships for continued
transport of the stored energy to the desired destination.
Fig. 2 does diagrammatically show a system 1 according to the
invention in which the rotation body 4 is supported in a sea
current with the aid of an anchoring member 20 provided with a
frame 25. The latter helps to keep the rotation body 4 in a predetermined
position in the sea current. The transfer member is
pivotably connected to frame 25 to which is also connected, a cable
24 for the purpose of transporting energy to land.
Figs. 10 and 11 cio in the system 1 according to the invention
illustrate different connections between the rotation bodies 4
and the float members 22. Fig. 10 illustrates an articulated
power transfer which eliminates influence from the sea waves.
Fig. 11 illustrates a stiff radial connection including an articulated
coupling and an electric current generator 5 installed
inside the rotation body 4. There is also a cable which transports
the energy generated in the generator 5 through the transfer
member 6, in this case constituted by a rigid shaft.
The difference structures above described have made it possible
to create a system including a rotation body the circumferential
speed of which can be increased radially. The low flow and the
great amount of water can be concentrated to an added force at
Fig. 14 does diagrammatically show how the streams get concentrated
to the outer diameter of the rotation body 4, especially
in the waist portion 7 area. Following this the streams are
again united to their original shape. For that reason the blade
size has been calculated to match exactly this fact and there
has been attained an efficiency corresponding to about 15 kW/m2
which is four times more than according to the prior art solutions
1. System (1) for generating energy, primarily with the use of sea currents, comprising a rotation body (4) having a front inlet side (2) and a rear outlet side (3) and at least one the inlet side (2) with a generator (5} connecting transfer member (6) as well as a, from a substantially cylindrical waist portion (7) at least towards the inlet side extending conically and/or with bulb shape tapering portion (8, 9), characterized in that the waist portion does along its circumference exhibit adjacent to each other located turbine blades (10) which extends outwards in a radial direction being essentially shorter than the radius of the waist portion (7) and are adapted to maintain the rotation of the rotation body, the free front end of which is secured to the transfer member (9) to transfer a rotational movement to the generator (5).
2. System as claimed in claim 1, wherein the rotation body (4) has a conical and/or concave or flat section extending in a direction opposite the cutlet side.
3. System as claimed in claim 1, wherein the incidence angles of the blades (10) is variable.
4. System as claimed in claim 1, wherein the rotation body (4) comprises a fluid supply member (11) adapted to keep the body in a correct float position in response to the intensity of the sea currents.
5. System as claimed in claim 1, wherein the rotation body (4) is located inside a nozzle-like casing (12) having a substantially hour-
glass form, its walls diverging from the tapered central section (13) of casing (12) in which the rotation body (4) is rotatably mounted.
6. System as claimed in claim 4, wherein the casing has a square cross section.
7. System as claimed in claim 1, wherein the said rotation body (4) has blades (18) along its circumference on the inner surface of the outer wall (17) for purpose of eliminating friction generated by a fluid (19) inside the rotation body, said blades at the same time serving as ribs for the purpose of stiffening up the outer wall (17).
8. System as claimed in claim 1, wherein the waist portion (7) of the rotation body (4) exhibits a truncated, conical body (26) supported by blades (10) and extending around the waist portion, the converging sides (27,28) of said body facing the waist portion (7) to form a tunnel formation (29) defined by the tapering section (8,9) of the rotation body and by the front side (27) of the truncated body (26) and narrowing towards blades (10) and the between those existing intermediate spaces (30) for the purpose of collecting and directing the sea currents.
|Indian Patent Application Number||01129/DELNP/2003|
|PG Journal Number||13/2009|
|Date of Filing||18-Jul-2003|
|Name of Patentee||WATER CROSSING, INC.|
|Applicant Address||C/O STRANDVAGEN 13, S-820 22 SANDARNE, SWEDEN.|
|PCT International Classification Number||F03B 17/00|
|PCT International Application Number||PCT/SE02/00078|
|PCT International Filing date||2002-01-17|