WO2016059118A1

WO2016059118A1 - Linear hydroelectric power plant

Info

Publication number: WO2016059118A1
Application number: PCT/EP2015/073791
Authority: WO
Inventors: Stephan Pacardo; Leif SCHOELLER
Original assignee: Aquakin Gmbh
Priority date: 2014-10-15
Filing date: 2015-10-14
Publication date: 2016-04-21
Also published as: DE102014115007A1

Abstract

A device (1, 2, 3) for transmitting flow energy of a flowing liquid or of some other medium is proposed. The device comprises a crank device (14, 24, 34), which is mounted rotatably about a crank axis, and at least one first vane (11, 21, 31), which is mounted on the crank device rotatably about a first vane axis of rotation. A force transmission device (41, 411, 42, 421, 43, 431) is designed to couple a rotational movement of the at least one first vane about the first vane axis of rotation to the rotational movement of the crank about the crank axis (K1, K2, K3).

Description

Title: Linear hydropower plant

description

The present description relates to hydroelectric power plants, in particular hydroelectric power plants, which can be arranged in a flowing water without impoundment of the water body.

Hydropower plants are today usually elaborate structures with which water is dammed up flowing water with complex construction measures and then passed through a duct and pipe system via a turbine, which is thereby placed in a rotary motion. In most cases, the rotational movement of the turbine is used to generate electrical energy. Other hydropower plants use a height difference, such as a step or slope, to produce the pressure necessary to operate a conventional hydropower plant.

Such hydroelectric power plants require massive structural interventions and change the natural flow significantly. They represent insurmountable obstacles to fish and other aquatic animals. Fish trawls and other measures are costly to enable fishing to pass through the dams. These cause high costs, but often do not achieve the desired effect.

Furthermore, the known hydroelectric plants are not readily scalable in size. Smaller power plants, which do not reach a certain water throughput and height difference, are often uneconomical. As a result, valuable energy is not used in many cases.

In order to use the water flow of flowing waters, have long been unterschlächtige water wheels in use. These waterwheels have a variety of blades which are made to rotate in a flowing body of water. They are not very efficient. There is therefore a need for more efficient, easily be arranged on a flowing water hydroelectric power plants.

Summary of the invention

The present description proposes improved hydroelectric plants and improved devices for such hydroelectric plants according to one of the independent claims.

Advantageous embodiments are given in the dependent claims.

In one aspect, the hydroelectric power plant comprises at least a first blade which is rotatably mounted on a first rotary device and at least one second blade, which is rotatably mounted on at least one second rotary device, wherein the first rotary device with the at least one second rotary device via a Power transmission is connected. The power transmission rotates the first rotating device at the same rotational speed and offset by a first angle to the at least one second rotating device.

In another aspect, a device for transmitting flow energy of a flowing liquid or other medium is proposed. The device comprises a crank device, which is rotatably mounted about a crank axle, and at least one first blade, which is rotatably mounted on the crank device about a first blade rotation axis. A power transmission device is designed to couple a rotational movement of the at least one first blade about the first blade rotational axis with the rotational movement of the crank about the crank axis. The coupling takes place such that the rotational movement of the at least one first blade about the first blade axis of rotation has a higher rotational speed than the rotational movement of the crank about the crank axis.

It is also proposed a blade for a hydroelectric power plant, wherein the blade is arranged rotatable about a full rotation about a running on a circular path blade axis of rotation. The blade has a power transmission device for Transmission of a rotary movement of the blade about the blade axis of rotation. The power transmission device is designed so that the blade rotates during one revolution on the circular path at least 720 ° about the blade rotation axis

Further embodiments, which show advantageous aspects, are listed in the dependent claims.

figure description

The invention will become more apparent upon reading the following description taken with reference to the figures which show:

1 shows an example of a linear hydroelectric power plant according to an example of the present description in an oblique view; Figures 2a and 2b, the linear hydroelectric power station of Figure 1 from other perspectives; Figure 3 is a side view of the linear hydroelectric plant, with the left float omitted for illustrative purposes; and FIG. 4 shows a waterwheel of the linear hydroelectric power station in various positions of full rotational movement.

Detailed description

In the following detailed description of the invention, examples are given which are merely exemplary of aspects and implementations of the invention and are not limiting. It is not necessary to implement the invention to employ all the features described with reference to one or more examples. Rather, one skilled in the art will recognize that various features may be omitted or substituted by others without departing from the invention. The present disclosure describes a device 1, 2, 3 for transmitting flow energy of a flowing liquid. The device may be placed on a flowing body of water, such as a river or a stream. Damming or deriving is not required. The device may comprise: a crank device, which is rotatably mounted about at least a first crank axle; at least a first blade, which is rotatably mounted on the crank device 14, 24, 34 about a first blade axis of rotation, and a power transmission device, which is adapted to a rotational movement of the at least one first blade about the first blade axis of rotation with the rotational movement of the crank about the crank axis couple. The coupling takes place such that the rotational movement of the at least one first blade about the first blade axis of rotation has a higher rotational speed than the rotational movement of the crank about the crank axis.

The crank means may comprise one or more cranks, levers, cardan shafts or belts or may be designed as a waterwheel. The crank mechanism can be arranged in operation above a water level.

The first blade axis of rotation may be arranged on the crank device so that it runs on a revolving circular path. The circumferential circular path can have a constant radius.

The first blade axis of rotation may be arranged offset substantially parallel to the crank axis and radially.

The power transmission device 41, 411; 42, 421; 43, 431 may also be referred to as a coupling device, which couples or controls a rotational movement of the at least one first blade 11, 21, 31 about the first blade rotational axis with respect to the crank device 13, 23, 33.

At least one second blade 12, 22, 32 can be arranged next to the first blade 11, 21, 31, wherein the second blade 12, 22, 32 is rotatably mounted about a second blade rotation axis S12, S22, S32 and wherein the second blade rotation axis S12, S22, S32 is arranged parallel to the first blade rotation axis. The second blade axis of rotation S12, S22, S32 can rotate on the same circular path about the crank axis as the first blade axis of rotation of the first blade. The second blade rotational axis S12, S22, S32 can be arranged symmetrically with respect to the crank axis relative to the first blade rotational axis.

The rotational movement of the first blade and the second blade may be substantially continuous.

There may be more than the described two blades per rotation means may be provided. In particular, with low immersion depths of the blades, a higher number of blades may be advantageous.

The blades may have a curved blade. The blades can be designed as a wing profile or wing-like profile. Due to the different flow velocity, depending on the angle of the blade to the water flow, an additional supporting force, in particular when the blade turns out of the water, as described in more detail below.

In the following examples of the invention will be described with reference to the accompanying figures. 1 shows an example of a linear hydroelectric power plant 5 according to an example of the present description in an oblique view. The linear hydroelectric power plant 5 has two floats 6, 7, which are arranged parallel to each other. Figures 2a and 2b show the linear hydroelectric power plant 5 of Figure 1 from other perspectives. The figures 2a shows the linear hydroelectric power plant 5 in a plan view from above. FIG. 2b shows the linear hydroelectric power plant 5 of FIGS. 1 and 2a from the front, the front side describing the side which is directed upstream in the flowing water.

The floats 6, 7 can be connected by braces, bridges or bridges to a boat or pontoon and floating on a body of water. In the illustrated example, the connection is made by three rotary devices 1, 2, 3. But there may also be additional connections between the floats 6, 7. The floats ensure that the pontoon and thus the linear hydroelectric power station 5 always has the same height above the water. fluctuating Water levels can be compensated to the point of settling the pontoon at the bottom of the channel or flowing water, without damaging the pontoons or the hydroelectric power plant. The pontoon can be fixed with ropes or chains on the banks of a flowing water, so that the water flows between the two floats 6, 7.

With regard to the described linear hydroelectric power station 5, the terms front, front or bow refer to the side which, in normal use, is directed counter to the flowing water or medium, i. E. the side that the streaming waters meet first. The terms rear, rear or rear refer to the downstream end of the linear hydroelectric power plant in normal operation. The left side is the longitudinal side of the hydroelectric power plant, which is located in the direction upstream on the left. At this left side of the left float 6 is arranged. For a boat, this left side corresponds to the port side. The right-hand side is the longitudinal side of the hydroelectric power plant, which is located upstream in the direction of view. At this right side of the right float 7 is arranged. For a boat, this right side corresponds to the starboard side.

On the floats 6, 7 are several, in the example shown in the figure 1 to 3, three rotary devices 1, 2, 3 arranged in the flow direction of the flowing water one behind the other or linear. The three rotary devices 1, 2, 3 are arranged one behind the other so that the flowing water passes through the rotary devices 1, 2, 3 in succession, first the first rotary device 1, then the second rotary device 2 and finally, the third rotary device 3, which Rear of the pontoon is arranged. This description of the arrangement relates to the rotary device as such. Paddles suspended thereon may be submerged in the flowing water in a different order, as described below with reference to FIG. Due to the linear arrangement, the power plant 5 is referred to as a linear hydropower plant. The three rotary devices 1, 2, 3 are substantially identical and differ only in some special features. Unless explicitly stated otherwise, features described with respect to one of the rotary devices 1, 2, 3 may also be present on the other rotary devices 1, 2, 3. As shown inter alia in Figure 3, the rotary devices 1, 2, 3 each include right and left bearing supports 16, 26, 36, in which a crank device 14, 24, 34 is rotatably mounted. On the crank mechanism 14, 24, 34 are each a plurality of blades 11, 12, 21, 22, 31, 32 arranged so that the blades between the two floats 6, 7 can rotate through the water when the linear hydropower plant 5 on a flowing Water is arranged. Each of the rotary devices 1, 2, 3 comprises at least one blade 11, 12, 21, 22, 31, 32. The blade may also be referred to as a blade or an airfoil. In the example illustrated in FIGS. 1 to 4, each of the rotary devices 1, 2, 3 comprises two blades 11, 12, 21, 22, 31, 32.

However, it can also be provided more than two blades per rotation device. This is particularly advantageous at low insertion depths.

Below or between the floats 6, 7 may additionally be arranged a protective device such as a rake 8. The rake 8 prevents larger flotsam from entering the blades and thus protects the hydroelectric power plant 5. The rake 8 can be designed so that smaller objects and aquatic animals, which can not harm the blades and are not themselves affected by the blades be able to flow through the rake 8 unhindered. The linear hydroelectric power plant thus does not present an obstacle to fish and other aquatic animals. The rake 8 may take the form of runners as shown in Figs. 1 and 2 so that larger objects can be passed beneath the floating hydroelectric power plant. In addition, the rake can also be extended at the bottom over the entire length of the float 6, 7 and protect the blades from below. At low water levels, the blades can not touch the ground or flotsam and the hydroelectric power plant can fall with falling water level to the bottom of the channel or flowing water without damage. Thus, the power plant can be left in a river even at low water levels. The protection device can thus exercise a dual protective function and protect the one hand, the hydroelectric power plant from flotsam and deadlock, while also protecting the hydroelectric power plant and in particular the blades against ground contact. It is also possible to provide the protective device in several parts and to implement both functions by means of separate devices. Alternatively to the arrangement on the floats 6, 7 shown in Figure 1, the rotary devices 1, 2, 3 are arranged in the same way on a bank, for example on a bank attachment. Thus, the full width of the flowing water can be exploited. In this case, a height adjustment of the rotary devices 1, 2, 3 and thus the blades may be provided to adjust the height of the blades 11, 12, 21, 22, 31, 32 to the respective water level. In an arrangement on floats 6, 7, however, this adjustment takes place by itself.

The rotary devices 1, 2, 3 are synchronously connected to each other, so that they rotate at the same rotational speed. This is illustrated in Figure 3, which shows a side view of the linear hydroelectric plant 5, with the left float 6 omitted for illustrative purposes.

Each of the rotary devices 1, 2, 3 is constructed the same and the rotary devices 1, 2, 3 are connected via a power transmission 9 in its rotational movement. In the example shown in FIG. 3, the rotary devices 1, 2, 3 are connected as power transmission 9 via a belt drive with belts or toothed belts 912, 923 and in each case one pulley 19, 29, 39 on each of the cranks 14, 24, 34. The pulleys 19, 29, 39 are each equal in size, so that the cranks 14, 24, 34 of the rotary devices 1, 2, 3 rotate at the same rotational speed.

As an alternative to the belt or timing belt, a chain drive with one or more chains and sprockets, a cardan drive, a push rod or the like can be used to achieve a direct power transmission between the rotary devices 1, 2, 3. The belt, timing belt, chain, cardan drive or other power transmission can also be used to power a generator.

In the example illustrated in FIGS. 1 to 3, each of the rotary devices 1, 2, 3 has two blades 11, 12, 21, 22, 31, 32 which are disposed at opposite ends of the cranks 14, 24, 34 are. Although the cranks 14, 24, 34 of the rotary devices 1, 2, 3 are identically rotating as described above, thus rotate at the same rotational speed, but they are rotated by an angle to each other. The blades do not dive synchronously into the water, but to offset each other. With three water wheels, an offset at an angle of approximately 30 ° is particularly advantageous. Thus it can be achieved that always one of the blades 11, 12, 21, 22, 31, 32 is in the water, and thus the transmission of forces is more uniform and efficient.

In the figure 3, a random point during the rotational movement of the cranks 14, 24, 34 of the rotary devices 1, 2, 3 is shown. A first blade 11 of the first rotating device 1 is in a submersion position, shortly after immersing the first blade 11 in the water. This position is shown again in FIG. 4a. A first blade 21 of the second rotating device 2 is at the same time in a lower emergence position just before it leaves the water, as it corresponds to the figure 4c. On the other hand, both blades 31, 32 of the third rotary device 3 are outside the water in a position corresponding to FIG. 4d. When the rotary devices 1, 2, 3 continue to rotate from the illustrated position by the water pressure of the flowing water onto the first blade 11 of the first rotating device 1 and the first blade 21 of the second rotating device 2, the first blade 11 of the first rotating device 1 will continue to move passed through the water while the first blade 21 of the second rotary device 2 is lifted out of the water. At the same time, the second blade 32 of the third rotary device 3 is prepared for immersion in the water. Before the first blade 21 of the second rotating device 2 is lifted out of the water, the second blade 32 of the third rotating device 3 is immersed in the water. It can thus be ensured that at any time at least one of the blades 11, 12, 21, 22, 31, 32 is in the water and is driven by the water. Since all rotary devices are connected to each other via the power transmission 9 in the same direction, those rotating devices which have no blades in the water, further rotated. This achieves a continuous and more efficient drive, for example of the generator. In addition, the blades do not interfere with each other, as only one blade at a time receives the main water pressure. In power plants with several synchronously running blades in a row always get the frontmost blade most water pressure, while the rear blades are shielded by the front blade and can contribute little to the power transmission. In the example shown in Figure 3, the blades dive offset from each other in the water. As described above, after the first blade 21 of the second rotating device 2, the first blade 11 of the first rotating device 1 is immersed in the water as shown in FIG. Then, as described above, the second blade 32 follows the third rotating device 3. Next follows the second blade 22 of the second rotating device 2, then the second blade 12 of the first rotating device 1 and finally the first blade 31 of the third rotating device 3. This results for the example described a blade sequence 21-11-32-22-12-31. This blade sequence has proven advantageous when three rotary devices are used. However, other blade sequences are also conceivable, in particular if more or fewer rotary devices are used.

It has been found that a number of three rotary devices 1, 2, 3, each with two arranged on a rotary device blades 11, 12, 21, 22, 31, 32 reaches a good efficiency. However, fewer or more rotary devices could be used.

By the staggered immersion of the blades and a uniform and relatively slow movement of the blades through the water fish and other animals in the water are disturbed as little as possible.

The blades 11, 12, 21, 22, 31, 32 are each rotatably mounted about a blade rotation axis Sl, S2, S3 on the crank 14, 24, 34. The blade axis of rotation Sil, S12, S21, S22, S31, S32 of the blades 11, 12, 21, 22, 31, 32 is mounted parallel, but radially offset from the crank rotational axis Kl, K2, K3, about which the cranks 14, 24, 34 are rotatably mounted on the bearing supports 16, 26, 36. In each case a first blade 11, 21, 31 and a second blade 12, 22, 23 are arranged point-symmetrically on the corresponding crank rotation axis Kl, K2, K3. The blade rotation axes Sil, S12, S21, S22, S31, S32 run during the rotation of the cranks 14, 24, 34 on a circular path about the respective crank axis Kl, K2, K3. The first blade 11, 21, 31 and the second blade run on the same rotating device 1, 2, 3 offset by 180 ° on the same circular path.

The blades 11, 12, 21, 22, 31, 32 are mounted so that they can each perform a full 360 ° rotation about its blade axis of rotation Sil, S12, S21, S22, S31, S32. The Rotational movement of the blades 11, 12, 21, 22, 31, 32 about their blade axis of rotation Sil, S12, S21, S22, S31, S32 is coupled to the rotational movement of the respective crank 14, 23, 34 via a blade drive or a power transmission. For this purpose, as shown in FIGS. 3 and 4, a blade toothed wheel 411, 412, 421, 422, 431, 432, which is synchronized with the respective blade 11, 12, 21, 22, 31, 32, can be arranged on the respective blade rotation axis about the corresponding blade rotation axis Sil, S12, S21, S22, S31, S32 rotates. The bucket gear 411, 412, 421, 422, 431, 432 is engaged with a stationary gear 410, 420, 430 which is fixedly connected to the suspension 16, 26, 36 and does not rotate during operation of the hydroelectric power plant. The stationary gear 410, 420, 430 is centered on the respective crank axis K1, K2, K3, but does not rotate with the crank 14, 24, 34. As the crank 14, 24, 34 rotates, the blade gears 411, 412, 421, 422, 431, 432 and thus the blades 11, 12, 21, 22, 31, 32 are set in a rotational movement and actively rotated. On the other hand, a rotary movement of the blades is converted into a rotation of the respective crank 14, 24, 34. This results in the sequence shown in Figure 4 of the rotation of the individual blades 11, 12, 21, 22, 31, 32nd

Alternatively to the illustrated and described coupling by means of blade gears 411, 412, 421, 422, 431, 432 and stationary gears 410, 420, 430, the transmission of the rotational movement of the blade on the rotation of the crank with a belt, timing belt a chain or other power transmission.

Figures 4a to 4e show the first rotary device 1 in different positions during a full revolution. The second and third rotation devices 2, 3 rotate accordingly, but each offset at an angle, as described above with reference to Figure 3. The first blade 11 and the second blade 12 of the first rotating device 1 are mounted on the same crank 14 and rotate in parallel with each other. The first blade 11 and the second blade 12 are aligned parallel to each other at all times, ie the blades always point in the same direction. During one revolution of the crank 14, the first blade 11 and the second blade 12 each rotate twice around the respective blade rotation axis Sil, S12. The first blade 11 and the second blade 12 thus have a higher rotational speed than the crank 14. Advantageously, the rotational speed of the blades 11, 12 about the blade axis of rotation Sil, S12 an integer multiple of Rotation speed of the crank 14 about the crank axis of rotation Kl, in particular twice. Due to the faster rotational movement of the blades 11, 12, the efficiency can be increased on their way through the water.

In the figure 4a, the first blade 11 is shown in a position shortly after immersion in the water. The blade tip of the first blade 11 is inclined forward against the flow. The shape of the airfoil forces downward on the airfoil and further draws the airfoil into the water. At the same time, the shape of the airfoil causes a rotational movement of the blade 11 towards a vertical blade position, as shown in FIG. 4b. The shape of the airfoil is designed to promote the rotational movement of the blade 11. This rotational movement of the first blade 11 counterclockwise about the blade axis Sil is converted via the blade gear 411 and the crank gear 410 in a rotational movement of the crank 14 also about the crank axis Kl in the counterclockwise direction. In addition, the flow causes a linear movement of the blade 11 through the water, which also contributes to the rotation of the crank 14.

By the force of the flowing water, the blade and thus the entire rotation means is brought into the senkreche position, which is shown in Figure 4b. In this position, the airfoil is approximately perpendicular and is aligned substantially parallel to the crank 14. The blade is shaped in such a way that in this position the water pressure is transferred well to the crank. In this position, the bucket gear 411 is in its lowermost position which may be designed so that the bucket gear 411 is not immersed in the water.

By the water pressure, the first blade 11 is further moved by the water towards the position shown in Figure 4c, in which the first blade 11 begins to lift from the water. Also in this position, the shape of the airfoil favors a rotation of the first blade 11 about the first blade axis of rotation Sil and the blade is accelerated out of the water. This rotational movement is in turn transmitted via the blade gear 411 and the crank gear 410 in a rotational movement of the crank 14. This rotary motion of the blade increases the efficiency and The efficiency of the hydroelectric power plant compared to rigid or vertical paddles or blades considerably.

The rotational movement of the blade through the water is favored by the shape or geometry of the blade in conjunction with the increased rotational movement. The blades are curved and can have a kind of airfoil profile in cross-section. In one example, the thickness of the airfoils may be constant. However, the promotion of the rotational movement can be further improved if the thickness of the blades varies in cross section. Thus, the thickness of the airfoil may decrease toward the tip. The thickness may also decrease towards the leading edge, with the point of greatest thickness being able to be located in the region between the center and the leading edge of the blade. As a result, the wing-like profile can be reinforced, while the turbulences are kept low at the same time.

The shape or geometry of the blades advantageously cooperates with the increased rotational movement of the blades about the blade axis of rotation. As described above, the rotational speed of the blades is twice as high, or some other integral multiple to the rotational speed of the crank. This faster rotation of the bucket in the water is reinforced by you shape or geometry of the blades. When immersed, the airfoil-like profile draws the blade into the water and then actively forces it further out of the water, thus increasing the rotation of the crank and increasing the efficiency of the linear hydropower plant compared to conventional airfoils.

When the first rotary device 1 is in the position shown in FIG. 4c, the next blade 32 of the third rotary device already dips into the water and takes over the force transmission, as described above with reference to FIG.

The first rotary device 1 now moves driven via the belt 912 in the position shown in Figure 4d, in which, when the crank 14 is substantially horizontal, both blades 11, 12 are located at the same height upwards. In the following, the second blade 12 is then brought into the immersion position, as shown in Figure 4e before, immersed in the water analogous to Figure 4a. The crank 14 has made only half a turn at this time, while both blades 11, 12 have each performed a full revolution about the respective blade axis Sil, S12. If the rotation continues, an image is again obtained analogously to FIGS. 4 a to e, the first blade 11 and the second blade 12 being interchanged. The second blade 12 moves through the water as described above for the first blade 11, while the first blade 11 is now rotated one full turn around the first blade axis Sil outside the water before being returned to the plunging position.

Previously, a linear hydroelectric power plant 5 with three rotary devices 1, 2, 3 has been described, which are arranged on two floats 6, 7, so that the linear hydroelectric power plant 5 can be easily arranged without any complex construction work on any body of water. The linear hydroelectric plant is freely scalable and can be adapted to the size and width of the river. Of course, it is also possible to arrange several of these linear hydroelectric power plants 5 next to one another or to use more than the rotational devices shown. Also, more than two blades may be attached to each rotating device. A person skilled in the art will adapt the linear hydropower plant shown here to different conditions and design the dimensioning accordingly.

In the foregoing description, the present invention has been described using the example of a linear hydroelectric power plant 5, but it is not limited thereto. It is also possible, instead of using water, to use another flowing liquid or another flowing medium. In addition to use as a linear power plant 5, a reversal of the function to a drive is conceivable. If a motor is used instead of a generator or the generator itself used as a motor, the blades can be used as a propulsion for a ship or actively move the pontoons through the water. It is thus also possible to drive the medium and, for example, to realize a pump, which is harmless for flotsam and aquatic organisms.

Another effect of the device shown is that the medium, in particular the water is mixed with air and thus ventilated. This can be used as a by-product of the described power plant, or described one Device can be used specifically for ventilation of the medium. Another application is the mixing of the medium by the blade. This effect can also be implemented as a side effect of the power plant or drive, or as a separate function.

Claims

Claims:

1. Device (1, 2, 3) for transmitting flow energy of a flowing

Liquid comprising:

a crank device (14, 24, 34), which is rotatably mounted about a crank axis (Kl, K2, K3),

- At least a first blade (11, 21, 31) which is rotatably mounted on the crank means (14, 24, 34) about a first blade axis of rotation (Sil, S21, S31); and

- A power transmission means (41, 411; 42, 421; 43, 431) which is adapted to a rotational movement of the at least one first blade (11, 21, 31) about the first blade axis of rotation (Sil, S21, S31) with the

Rotary movement of the crank to the crank axis (Kl, K2, K3) to couple such that the rotational movement of the at least one first blade (11, 21, 31) to the first blade rotation axis (Sil, S21, S31) has a higher rotational speed than the rotational movement the crank around the crank axle (Kl, K2, K3).

2. Device according to claim 1, wherein the first blade axis of rotation is arranged to the crank axis substantially parallel and radially offset.

3. Device according to one of the preceding claims wherein the

Power transmission means (41, 411; 42, 421; 43, 431) has a gear ratio such that the rotational speed of the first blade (11, 21, 31) about the first blade rotation axis (Sil, S21, S31) is an integer multiple of

Rotation speed of the crank mechanism (14, 24, 34) about the crank axis 2: 1.

4. Apparatus according to claim 4, wherein the coupling means (41, 411; 42, 421; 43, 431) comprises two intermeshing gears of the same number of teeth.

5. Device according to one of the preceding claims, wherein at the

Crank means the first blade (11, 21, 31) and a second blade (12, 22, 32) are arranged, wherein the second blade (12, 22, 32) about a second

Vane rotation axis (S12, S22, S32) is rotatably mounted, wherein the second

Vane rotation axis (S12, S22, S32) is arranged parallel to the first blade axis of rotation.

6. Apparatus according to claim 6, wherein the second blade axis of rotation (S12, S22, S32) runs on the same circular path around the crank axis as the first blade axis of rotation of the first blade.

7. Device according to one of the preceding claims, wherein the first blade (11, 21, 31) has a curved blade.

8. Device according to one of the preceding claims, wherein the first blade (11, 21, 31) has a sheet with airfoil-like profile.

9. A hydroelectric power plant (5) for arrangement in flowing water, comprising: a first rotating device (1) according to one of the preceding claims and at least one second rotating device (2, 3) according to one of the preceding claims, wherein the first rotating device (1) the at least one second rotation device (2, 3) is connected via a power transmission (90);

wherein the power transmission (90) rotates the first rotating device (1) by a first angle with respect to the at least one second rotating device (2,3) at the same rotational speed.

10. Hydroelectric power plant (5) according to claim 9, further comprising a third

A rotary device (3), wherein the first rotary device is rotated to the second rotary device (2) by an angle of about 60 °, and wherein the second rotation device (2) is rotated to the third rotation device (3) by an angle of about 60 °.

11. Hydroelectric power plant (5) according to claim 9 or 10, wherein the first rotation device (1) and the at least second rotation device (2, 3) are arranged one behind the other with respect to the flowing body of water.

12. Hydroelectric power plant (5) according to one of claims 9 to 11, wherein the first

Rotating device (1) and the at least second rotary device (2, 3) are arranged on a floating pontoon.

13. Hydroelectric plant (5) according to claim 12, wherein the pontoon has a protective device 8 below at least one of the first and second rotating device.

14. A blade for a hydroelectric power plant (5), wherein the blade (11, 12, 21, 22, 31 32) rotatable about a full revolution about a circular path running

Vane rotation axis (Sil, S12, S21, S22, S31, S32) is arranged, wherein the blade has a power transmission device for transmitting a rotational movement of the blade about the blade axis of rotation, wherein the

Power transmission device is designed so that the blade rotates during a revolution on the circular path at least 720 ° about the blade axis of rotation.

A blade according to claim 14, wherein the blade has a curved blade.

16. A blade according to claim 14 or 15, wherein the blade has a cross-section

having an airfoil-like profile.

A blade according to any one of claims 14 to 16, wherein a blade of the blade varies in thickness.