Wave power plant

 

(57) Abstract:

The inventive operating element is oriented along the wave front, and is installed below the water level with the ability paleobiota rotation. The element is designed as blades streamlined shape, the axis of rotation which lies in the cavity outside from the front edge. The blade is made with zero buoyancy. 1 C. p. F.-ly, 4 Il.

The invention relates to hydropower and can be used for utilization of the energy of wind waves.

Known wave power plant comprising oriented along the wave front is secured with the opportunity paleobiota of rotation of the rotor, the axis of rotation which is located above the water level so that their lower edges submerged in water /A. with. The USSR NN 1105683; 1208298; 1247578; 1249191; the United Kingdom patent N 2110763; U.S. patent NN 4369374; 4495424/.

The disadvantage of these structures is their low efficiency. With the passage of waves through the lower part of the rotor of the particles of water moving sequentially on orbital trajectories, constantly changing the direction of its motion, and only once in each wave their direction coincides with the direction of degeneration movement of the lower part of the rotor and creates a resistance to its rotation.

Another disadvantage of these designs is their vulnerability against storm waves. Part of rotors located both above and below the water level in extreme conditions will be entirely exposed to the powerful shock waves. Fences that can be installed to protect the rotors require too much capital.

Also known wave power plant containing floats, made in the form of a cylindrical helix, located across the wave front. C. the USSR N 901608; French patent N 2505937; U.S. patent NN 4384212; 4443708/.

The disadvantages of these wave energy facilities is the bulkiness and complexity of the design, low efficiency and insecurity when the storm of excitement. For these installations, the step coil of the spiral must be the same wavelength. Therefore require complex mechanisms regulating step. The float in the form of a cylindrical helix uses only the movement of the surface water layers, and the energy extracted from the waves, is limited by the ratio of the forces of weight and buoyancy acting on different parts of the spiral of the float. In case of a storm of excitement spiral float is too big guide the th to the claimed design is the wave power plant, containing oriented along the wave front is fixed below the water level with the ability paleobiota of rotation of the work item, made in the form of a rotor with multiple symmetrically arranged blades /patent UK N 2119449/.

The disadvantage of this wave power plant is low efficiency. Water particles in a wave make a consistent orbital rotation on different orbits decreasing with depth diameter. However, their vectors of the instantaneous velocities in the cross-section waves do not form a closed trajectories, as it happens, for example, in the whirlpool. Therefore, the rotor with multiple symmetrically arranged blades will be tested at each time point opposite torques from various blades. Thus the rotation of the rotor can be carried out only by the difference in diameters of the orbital rotation of the particles of water, which is ineffective. Another disadvantage of this design is a big drag, non-streamlined shape of the rotor, which is causing high loads when the storm of excitement.

Sea wind waves represent one of the most attractive and inexhaustible potential is placed several engineering problems. Device, the energizing waves, should have perhaps more simple and robust design, so they can be cost-effectively installed and operated, to be effective enough to get the energy had a reasonable price and should be stable in extreme conditions storm of excitement.

To achieve this technical result of the wave power plant comprises oriented along the wave front mounted below the water level with the ability paleobiota of rotation of the work element made in the form of blades streamlined shape, the axis of which lies in its plane beyond its leading edge.

With this design the blade in every moment of passage of the wave tends to occupy the position with a minimum hydraulic resistance and therefore does paleobiota rotation followed by the orbital rotation of the water particles. The value of the selected power depends on the load on the blade, created, such as a generator, and is determined by the amount of lag in the rotation of the blades from the orbital rotation of the water particles. The larger the payload, the more the amount of lag and the mask of torque on the axis of rotation of the blade. Thus, the device has a simple structure and ensures the efficient use of energy waves throughout the orbital cycle of rotation of the water particles with the passage of the wave. In storm conditions the excitement of the power of the waves is much higher than the average required for installation, so the blade will have a minimum gap from the orbital rotation of the particles of water and take in every moment of time corresponding to the minimum hydraulic resistance. Due to this design of the device will pass through the stormy waves, experiencing minimal load.

The efficiency of wave power plant also increases due to the fact that the blade has zero buoyancy, that is, has an average density equal to the surrounding water. This eliminates the influence of gravity of the blade on the work of installation, to improve the smoothness of rotation and to reduce the resistance of storm waves.

The figure 1 shows the wave power plant.

In figure 2 the same cross section.

The figure 3 shows the plans of the instantaneous velocities of the water particles in the cross section of the wave is flax excess capacity excitement over the energy wave power installation.

In figure 4 the same, with significant excess capacity excitement over the energy wave power installation.

Wave power plant /Fig. 1 and 2 has a housing 1 that is located above the water level of the reservoir and rests hollow struts 2 on the bottom. It contains oriented along the wave front, installed below the water level with the ability paleobiota of rotation of the working element in the form of blades streamlined 3. The blade has at the ends of the sidewall is made in the form of cranks 4, the shafts of which 5 have a common geometric axis located in the plane of the blade outside from the front edge 6. The shafts of the cranks mounted in bearings in the hollow struts 2, within which is located a toothed-belt transmission 7. The lower pulleys 8 toothed-belt drives mounted on shafts 5 of the cranks, and the upper pulleys 9 - output shaft 10 of the installation, located in its housing 1.

The blade 3 has zero buoyancy, that is, has an average density equal to the surrounding water.

The property of zero buoyancy eliminates the influence of gravitational forces in the interaction of the blades with the moving water particles during the passage of waves /Fig. 3 and 4/. Uborochnoe rotation about the axis of the shafts 5 and transmits torque via a toothed-belt transmission 7 to the output shaft 10 of the installation. The use of synchronous running of the two toothed-belt transmission reduces twisting load on the blade. The blade has a streamlined shape and creates the less resistance moving water particles, the more power and excitement exceeds energy output. If power disturbances less energy capacity installed, then the blade will remain stationary or oscillate, creating a variable resistance to movement of the waves, changing depending on the stage of its transition. If the power and excitement marginally exceed the energy capacity of the unit, then the blade will begin to make paleobiota rotation, occupying almost perpendicular to the vectors of the instantaneous velocities of the water particles in the wave, thereby creating a maximum hydraulic resistance and removing most of the energy wave /Fig. 3/. If the power and excitement will significantly exceed the energy capacity installation /for example in terms of storm/, then to effect the rotation of the blade will be a relatively small part of the energy wave and the blade will take in each moment of time a position almost corresponding to the direction vectors of instantaneous the ways, wave power plant will operate optimally in the whole range of power disturbances, ranging from a minimum value corresponding energy capacity installed up a storm of excitement.

Minimum hydraulic resistance of the blade during a storm of excitement minimizes the load experienced by the installation in extreme conditions. Hollow pillar 2 of the housing 1 installation resting on the bottom, also have a small middle section and do not have critical loads from storm waves.

1. The wave power installation comprising oriented along the wave front, and installed below the water level with the ability paleobiota of rotation of the work element, characterized in that the working element is designed as blades streamlined shape, the axis of which lies in its plane outside from the front edge.

2. Installation under item 1, characterized in that the blade is made with zero buoyancy.

 

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