RU2382231C2 - Hydro-generator driven by sea current - Google Patents

Abstract

FIELD: engines and pumps. ^ SUBSTANCE: invention relates to designs of plants designed to convert water current energy into electric power. Proposed hydro-generator driven by sea current comprises hydrodynamic drive 2 and electric birotary generator 1 made up of housing 3, outer and inner rotors 4 and 5. Inner rotor 5 is arranged inside said housing 2. Hydrodynamic drive 2 represents blades 9 radially fitted on outer surface of outer rotor 4 and is mounted in casing 19 furnished with inlet and outlet branch popes. Housing 3 and casing 19 represents cylindrical structures. Outer rotor 4 seats outside housing 3. Rotors 4 and 5 are coupled via reduction gear 12 comprising driven gear 13 in mesh with outer rotor 4, idle gears 14 and drive gear 16 in mesh with inner rotor 5 to ensure counter rotation of rotors 4 and 5. ^ EFFECT: higher efficiency, reduced sizes and increased power output. ^ 2 cl, 2 dwg

Description

The invention relates to the construction of installations for converting the energy of the incoming flow of water into electrical energy.

Energy production, which is a necessary means for the existence and development of mankind, has an impact on nature and the human environment. On the one hand, heat and electricity so firmly entered into the life and production of a person that a person does not even imagine his existence without it and consumes inexhaustible resources for granted. On the other hand, people are increasingly focusing their attention on the economic aspect of energy and require environmentally friendly energy production. This suggests the need to address a range of issues, including the redistribution of funds to meet the needs of mankind, the practical use of achievements in the national economy, the search and development of new alternative technologies for generating heat and electricity, etc.

Known hydropower installation according to the application of the Russian Federation for invention No. 93029865, containing two screws rotating in different directions, connected by shafts respectively to the rotor and stator of the generator. In this case, the generator stator rotates.

This is a big disadvantage because the stator must be placed in a fixed housing designed for mounting to a support and the output of electrical wires. In addition, the rotor, stator and screws rotate at the same angular speeds. If you design a high-speed generator having a speed of, for example, 3000 ... 10000 rpm, then you will not be able to design a screw with a diameter of more than 1 m due to strength considerations, due to large centrifugal loads.

For example, at n = 10,000 rpm and D = 1 m / s,

the rotational speed of the screw on the periphery will be equal to 532 m / s, i.e. almost 2 times the speed of sound in air and is comparable with the speed of sound in water and is unacceptable under the conditions of strength. For industrial hydrogenerators, to obtain maximum power, it is necessary to have screws with a diameter of 5 ... 10 m or more.

Known hydrogenerator operating on the sea current according to the patent FR 1137394 A, 04/28/1957, F02B 13/10, a prototype that contains an electric generator and a hydrodynamic drive made in the form of blades radially mounted on the outer surface of the outer rotor, the generator is made birobative, containing a casing, external and internal rotor.

Disadvantage: low power generator.

The objective of the invention is to increase the efficiency of the installation while reducing its size and at the same time increasing the power.

This problem is achieved due to the fact that in a hydrogenerator operating on a sea current containing a hydrodynamic drive and an electric generator made birobative and including a housing, external and internal rotors, the last of which is located inside the housing, and the hydrodynamic drive is made in the form of radially mounted on the external the surface of the outer rotor of the blades and is placed in a casing having an inlet and outlet nozzles, according to the invention, the casing and the casing are cylindrical, the external rotor is located the arms of the housing, and the rotors are interconnected by means of a gearbox, including a driven gear connected to the external rotor, intermediate gears and a driving gear connected to the internal rotor, and providing opposite rotation of the rotors.

The hydrogenerator may be equipped with a pressure compensator in communication with the sealed cavity of the electric generator filled with lubricating fluid.

The invention is illustrated in figures 1 and 2, where:

figure 1 shows a diagram of an alternative energy source;

figure 2 shows a section aa in figure 1.

The hydrogenerator (Fig. 1) contains an electric generator 1 and a hydrodynamic drive 2 made at the same time, which is powered by water energy, and consists, in turn, of a cylindrical body 3, an external rotor 4 and an internal rotor 5, mounted respectively outside and inside the cylindrical body 3 concentric to him. The generator 1 contains an excitation winding 6, made inside the cylindrical body 3, and external magnets 7 and internal magnets 8 mounted respectively on the outer and inner rotors 4 and 5.

The hydrodynamic drive 2 (Fig. 1) consists of rectangular blades 9 mounted on the outer surface of the outer rotor 4 along its axis.

The rotors 4 and 5 are mounted on the housing 3 on bearings 10 and sealed with seals 11. The cavities “B” and “C” of the electric generator 1 are filled with a lubricating fluid.

The inner rotor 5 is connected to the outer rotor 4 through a gearbox 12, which contains the driven gear 13 connected to the outer rotor 4, the intermediate gears 14 mounted on the shaft 15, and the drive gear 16 connected to the inner rotor 5. The cavity of the gearbox 12 is filled with lubricating fluid .

The use of such a scheme will reduce the diametrical dimensions of the generator 1, increase its efficiency and reduce the diameter of the installation several times. In this case, the power of the installation can be increased due to its axial dimensions.

To the housing 3 of the generator 1 (Fig.1 and 2) ribs 17 attached support 18.

The generator 1 and the hydrodynamic actuator 2 are enclosed in a cylindrical casing 19, which has an inlet pipe 20 and an output pipe 21 (figure 3). Channel “D” is connected to cavity “B” by the cavity of pressure compensator 22, inside of which a spring-loaded piston 23 is installed. Hole “E” communicates the cavity of pressure compensator 22 with the environment.

During operation of the installation, it is installed in the area of constant flow of water. The flow of water passes through the inlet pipe 20 and drives the hydrodynamic actuator 2 (figure 1), acting on the rectangular blades 9.

The internal rotor through the gearbox 12 rotates in the opposite direction. This will increase the rate of change of the magnetic flux passing through the windings (winding) of the excitation 6 of the generator 1. The magnetic field crosses the excitation windings 6 and an EMF appears in them. The generated electrical energy is supplied through electric wires to energy consumers (in Fig.1 ... 2 the output circuit of the wires is not shown).

The casing 19 prevents radial flow of water under the action of centrifugal forces and increases the efficiency of the installation.

The application of the invention will allow:

1. To ensure a high efficiency of the installation due to the use of a birotative scheme of the electric generator, i.e. rotation of two rotors in opposite directions.

2. Get more power due to the large axial length of the device, while the maximum water flow passes through it. A large power generator can be obtained without increasing its diametrical dimensions and a significant increase in weight and centrifugal loads.

3. To reduce the diametrical dimensions of the electric generator through the use of a birotative scheme.

4. To simplify the design of the device as a whole by combining the main components of the electric generator and the hydrodynamic drive and reducing the number of parts.

5. To reduce the noise level created by the device during operation through the use of a casing.

6. Ensure the installation of the device on the ocean floor at any depth through the use of a pressure compensator.

Claims (2)

1. An offshore hydrogenerator comprising a hydrodynamic drive and an electric generator, made birobative and comprising a housing, an external and an internal rotor, the last of which is located inside the housing, and a hydrodynamic drive is made in the form of vanes radially mounted on the outer surface of the outer rotor and placed in a casing having an inlet and outlet nozzles, characterized in that the casing and the casing are cylindrical, the outer rotor is located outside the casing, and the rotors are interconnected by means of the gearbox, including the driven gear connected to the external rotor, the intermediate gears and the driving gear connected to the internal rotor, and providing the opposite rotation of the rotors. 2. The hydrogenerator according to claim 1, characterized in that it is equipped with a pressure compensator in communication with the sealed cavity of the electric generator filled with lubricating fluid.

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