WO2012019676A2

WO2012019676A2 - Hydroelectric power plant and method for assembling said hydroelectric power plant

Info

Publication number: WO2012019676A2
Application number: PCT/EP2011/003294
Authority: WO
Inventors: Jörg LOCHSCHMIDT; Benjamin Holstein
Original assignee: Voith Patent Gmbh
Priority date: 2010-08-10
Filing date: 2011-07-02
Publication date: 2012-02-16
Also published as: DE102010033940A1; WO2012019676A3

Abstract

The invention relates to a hydroelectric power plant having the following components or features: a water turbine; an electrical generator having a rotor and a stator; and a shaft, by means of which the water turbine and the generator are in a driving connection. The invention is characterized by the following features: setting means for setting the radial distance between the rotor and stator during the assembly are provided; and the setting means can be removed after the assembly.

Description

Hydropower plant and method for its assembly

The invention relates to a hydropower plant and a method for their

Assembly. The invention particularly relates to an underwater power plant, for example a tidal power plant or a water turbine. As an example, the object of the invention will be explained on a tidal power plant.

In a stream of water freestanding underwater power plant, especially for power generation from a tidal current, are known. A typical design included a propeller-type water turbine revolving on a nacelle. The nacelle of a on the

Watersgrund fundamental support structure worn or held as a buoyant unit by anchoring at a predetermined depth. For a sufficiently large training such underwater power plants already relatively slow currents can be exploited for energy. This is typically an electrical in the nacelle

Generator provided, which is at least indirectly driven by the water turbine. To be in the drive train of the underwater power plant on a maintenance-prone

To be able to do without gearboxes, directly driven electric generators have been proposed, the resulting slow speed of the generator rotor being compensated by its high-pole configuration. The resulting from this approach electrical generators for a generic

Underwater power plant, however, are large-scale and heavy. This leads to a high assembly cost, in particular for on-site assembly aboard a watercraft or at the installation of the system.

Furthermore, to form the high-pole generator rotor

High performance permanent magnets used so there is a need for transporting and handling a generator rotor one

Provide permanent magnet fuse. In addition, a system concept with a watertight encapsulated electric generator with an enclosing housing and a shaft seal further aggravates the assembly.

Similar hydropower plants have become known from WO 2007/125349 A2 and WO 2007/017629 Al. From these documents, a shaft bearing is apparent, which is arranged in the axial direction seen on both sides of the electric generator. For such a construction, the bearing adjustment is usually made with a generator rotor mounted on the drive shaft.

In this case, the weight of the electric generator in the storage adjustment is a hindrance. Furthermore, unwanted magnetic forces can have a disturbing influence on the centering of the components to be stored and the bearing adjustment, in particular in the case of a generator rotor design with permanent magnets. Mounting devices are needed.

WO 2010/003604 describes an underwater power plant in the form of a gondola. In this case, the turbine is arranged in a first nacelle section, and the generator in a second. The generator and the generator housing form a separate generator unit. This can be handled and assembled as a whole. The generator is delivered fully assembled by the manufacturer. The question of a montage thus does not arise for the operator.

The invention is based on the object, a generic

Hydropower plant in such a way that its mounting in terms of

Transport and handling of individual components is improved and the merging and adjustment, in particular the Lagerjustage, the

Plant components simplified. The object underlying the invention is solved by the features of the independent claims. Accordingly, adjusting means are provided for adjusting the radial distance between the rotor and the stator. The adjustment means can be introduced before or during assembly, and removed after assembly.

Another idea of the invention is as follows:

The generator assembly is in turn manageable and mountable as a whole. The generator of the generator thus requires no

Mounting devices.

The non-rotatable connection between the turbine and the shaft and between the generator assembly and the shaft is a plug connection.

- The cooperating with each other components are dimensioned such that the connection is a frictional, and can transmit the torques occurring during operation.

The invention is explained in more detail with reference to the drawing. The following is shown in detail:

Figure 1 shows a hydropower plant in the assembled state in one

Axial section. FIG. 2 shows the article of FIG. 1 in an exploded view.

Figure 3 shows the turbine housing of Figures 1 and 2 in an enlarged

Presentation. Figure 4 shows the electric generator of Figures 1 and 2 in an enlarged view.

FIG. 5 again shows an enlarged view of an adjusting device for setting the mutual axial distance between the stator and

Rotor of the electric generator.

Figure 6 shows the shaft of Figures 1 and 2 in an enlarged view. Fig. 7.1 - 7.6 illustrate the individual process steps for mounting the

Hydroelectric power plant according to FIG. 1.

The hydropower plant shown in Figure 1 comprises the following elements:

The turbine 1 is designed as a tubular turbine in propeller design. It has several propeller blades 1.1. These can be variable pitch propellers. Turbine 1 has a discharge hood 1.2.

The electric generator 2 comprises a rotor 2.1 and a stator 2.2. The rotor 2.1 is located radially inside the stator 2.2. This could be the other way around. Rotor 2.1 is occupied by a plurality of permanent magnets.

It also recognizes a shaft 3. This is in the assembled state a mechanical drive connection between the turbine 1 and generator 2 ago.

An important component is the turbine housing 4. This has an inlet structure 4.1, further an outlet pipe 4.2. The turbine housing 4 fulfills two

Functions. Above all, it carries the shaft 3, the turbine 1 and the generator 2. Then, the A running structure 4.1 of the housing 4 meets the hydraulic function of supplying the incoming water to the turbine first A flow hood 2.3 is placed on the stator 2.2 and ensures a

Separation of the machine interior from the environment.

The exploded view according to FIG. 2 allows the individual components to be recognized even more accurately. Important is the design of the turbine housing 4. The central component for mounting are the shaft 3 and the turbine housing 4. The turbine housing 4 has a radial bearing 5.1 and a thrust bearing 5.2. The shaft has a radial bearing 6.1 and a thrust bearing 6.2. Thrust bearing 6.2 is arranged on a side surface of a collar 6, see also FIG. 3.

From Figure 5 can be seen the said device for positioning of the rotor 2.1 and 2.2 stator relative to each other. The rotor 2.1 of the generator 2 is pre-assembled at the manufacturer in the stator 2.2 and held by means of several screws 9 in a centered position. At the two end shields 2.2.2 (here only one

End shield shown) of the stator 2.2, three screws 9 are distributed

arranged. This is thus a total of six screws 9. Hereby the rotor sleeve 2.1.1 is held in the stator 2.2. There is thus a precise and reliable positioning of the rotor 2.1 and stator 2.2 relative to each other. The radially inner end of each screw 9 is formed as a pin. This engages in an annular groove in the rotor sleeve 2.1.1. The set screws are installed by the manufacturer during assembly of the generator and removed after assembly. After installation, the set screws are removed again.

It can also be used more or less than three screws.

In general, other means for adjusting the radial distance of the rotor 2.1 and stator 2.2. conceivable, for example, wedges. Radial bearing 5.1 works together with radial bearing 6.1, and thrust bearing 5.2 with thrust bearing 6.2. The shaft 3 carries another collar 7 with paragraph 7.1. Covenant 7 is dimensioned such that its outer diameter corresponds to the clear width of a sleeve 2.1.1 of the rotor 2.1.

The one end of the stator 2.2 carries retaining pins 2.2.1. These engage in the assembly in corresponding holes of a support ring 8 of L-shaped profile. See also FIG. 4.

The transmission of the torque between the shaft 3 and the generator 2 takes place by frictional engagement between these two. See said bearings 5.1 to 5.3, as described with reference to Figure 2 and Figure 3.

The shaft 3 transmits the forces via said bearing in the housing parts, and the torque of the turbine 1 to the generator 2. As a tread coating is a flame-sprayed and then ground hard layer is used. The following properties are decisive for the function of the bearings: the hardness, the surface quality, the form and bearing tolerances of the hard layer. But also the tightness is important, namely for corrosion resistance. Therefore, on the shaft under the hard layer, a layer can be applied, the pitting and

is resistant to corrosion and consists for example of stainless steel.

The assembly of the entire power plant results from the figures 7.1 to 7.6. In detail, the following process steps are carried out: Figure 7.1 again shows the turbine housing 4. It is placed vertically. The inlet structure points upwards. For this purpose, smaller mounting platforms or scaffolding are used.

In this position, the thrust bearings can be positioned 5.1.

Figure 7.2 illustrates the insertion of the shaft in the housing 4, in the inlet region, until the thrust bearings 5.2 and 6.2 abut each other under pressure. At the same time, the radial bearings 5.1 and 6.1 are at the same time. The shaft 3 requires no further centering and does not need to be further set up as it is centered over the radial bearing seat. However, it must be positioned coaxially with the radial bearing shell 6.1. The fine tuning can be done by means of a feeler gauge.

According to FIG. 7.3, the generator 2 is now pushed onto the shaft 3. The generator is in the delivered condition with rotor 2.1. A centering is not necessary because the radial positioning of the parts via the radial bearing shell takes place. Here, the rotor sleeve 2.1.1 is pushed onto the collar 7, wherein a frictional engagement between these two is produced.

Now, the rear radial bearing is mounted - see Figure 7.4, there the circled parts, namely a support ring 8 and the end of the shaft 3. It must again be ensured that the shaft coaxial with

Support ring 8 runs. As stated above, the set screws 9 are removed after completion of the bearing assembly. As a further step follows the assembly of the rotor of the turbine 1 - see Figure 7.5. For this purpose, the previously mounted unit is turned upside down so that the run-in structure 4.1 points downwards.

The rotor can be mounted and mounted without difficulty. There is enough space for this. Aligning is not necessary.

According to FIG. 7.6, the unit mounted so far is in turn rotated so that the inlet structure 4.1 points upwards. Now, the Anströmhaube 2.3 is mounted, possibly also peripheral systems within the Anströmhaube

LIST OF REFERENCE NUMBERS

1 water turbine

1.1 Turbine blades

1.2 outflow hood

2 generator

2.1 rotor

2.1.1 rotor sleeve

2.2 stator

2.2.1 Retaining pins

2.2.2 End plate

2.3 Flow hood

3 wave

4 turbine housings

4.1 inlet structure

4.2 outlet pipe

5.1 Radial bearings

5.2 Thrust bearing

6 close to the turbine

6.1 Radial bearings

6.2 Thrust bearing

7 turbines distant federal government

7.1 paragraph

8 support ring

9 set screw

9.1 Locknut

Claims

claims

1. Hydroelectric power plant, comprising the following components or features:

1.1 a water turbine (1);

1.2 an electric generator (2) with a rotor (2.1) and a stator (2.2);

1.3 a shaft (3), via the water turbine (1) and generator (2) in

Drive connection stand;

characterized by the following features:

1.4 there are adjusting means (9) for adjusting the radial distance between the rotor (2.1) and stator (2.2) provided during assembly;

1.5 the adjustment means (9) are removable after assembly.

2. Hydroelectric power plant according to claim 1, characterized by the following features:

2.1 the adjusting means (9) comprise adjusting screws (9) for screwing into threads of the stator (2.2);

2.2 the threads are arranged such that the set screws (9) are supported in the screwed state for adjusting the mutual radial distance between the rotor (2.1) and stator (2.2)

3. Hydroelectric plant according to claim 2, characterized in that in at least one of two end shields (2.2.2) of the stator (2.2.)

Threaded bushings (2.2.2) are provided for screwing in the screws (9).

4. Hydroelectric power plant according to claim 3, characterized by the following features:

4.1 a turbine housing (4), which surrounds the turbine (1) and in the flow direction in front of the turbine (1) has an inlet structure (4.1) and behind the turbine (1) an outlet pipe (4.2);

4.2, the turbine housing (4) has a radial bearing (5.1) into which the shaft

(3) is insertable, and forms a seat with this;

4.3 the turbine housing (4) has a radial bearing (5.2) which cooperates with an abutment (6.2) formed from the shaft (3);

4.4. the shaft (3) has a radial bearing (5.3) at its end opposite the turbine (1).

5. Hydropower plant according to claim 4, characterized in that the shaft (3) is surrounded by a turbine close collar (6), the one

Thrust bearing (6.2) contributes, in turn, with the thrust bearing (5.1) of the housing

(4) works together.

6. Hydropower plant according to claim 4 or 5, characterized in that the shaft (3) by a turbine remote collar (7) is surrounded, which carries a radially inner sleeve (2.1.1) of the rotor (2.1).

7. Hydroelectric power plant according to one of claims 4 to 6, characterized

in that the stator (2.2) carries at its turbine-remote end a support ring (8) which forms a bearing for the shaft (3).

8. A method for mounting a hydroelectric power plant according to one of

Claims 1 to 7, characterized by the following method steps:

8.1 the shaft (3) is inserted into the housing (4), in the

Inlet area until mutual contact of the thrust bearings (5.2, 6.2);

8.2 the generator (2) is pushed onto the shaft (3);

8.3 a support ring (8) is pushed onto the turbine housing facing away from the end of the shaft; The rotor of the turbine (1) is rotatably connected to the shaft. Hydroelectric power plant and method for its assembly