JP2001323867A - Hydraulic power plant and vibration reducing method for hydraulic power plant - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hydraulic power plant capable of reducing the vibration in the case of operating plural hydraulic turbine generators at the same time, and provide a method of reducing the vibration of the hydraulic power plant. SOLUTION: In a hydraulic power plant provided with plural hydraulic power generators, the hydraulic power generators 2A and 2B are fitted with opposite phases so as to lower the vibration to be generated from the hydraulic power generators 2A and 2B, for example, a runner blade 11b is fitted with a fitting deviation L in relation to a runner reference point 10b set by a rotator 7b.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for reducing vibration of a hydroelectric power plant and a hydroelectric power plant, and more particularly to a method of reducing vibration of a hydroelectric power plant and a hydroelectric power plant with reduced vibration.

[0002]

2. Description of the Related Art In a large-scale hydroelectric power plant that generates power using a turbine driven by a turbine driven generator, a plurality of turbine generators having the same design and the same performance and size are operated side by side. It is common to use

As shown in FIGS. 4 (a) and 4 (b), a conventional power plant 21 has a water turbine generator 22A having the same specifications.
The turbine runner 23a of the turbine generator 22A is provided with a plurality of runner reference points 2 set on the rotor 24a of the turbine generator 23a, as shown in FIG.
5a, for example, one end 27a of the runner blade 26a
Are connected by a coupling 29a so as to coincide with an axis 28a passing through the runner reference point 25a.

[0004] Further, as shown in FIG. 4 (b), a water turbine runner 23b has a runner reference point 2 similar to the water turbine runner 23a.
5b, one end 27b of the runner blade 26b is connected by a coupling 29b so as to match,
No mounting deviation is provided between the turbine runner 23a and the turbine runner 23b.

Therefore, a phase difference cannot be made between the vibration generated from the turbine runner 23b and the vibration generated from the turbine runner 23a, and the guide vanes and the runner blades 23a,
By the action of 3b, vibrations having the same phase generated from each of the turbine generators 22A and 22B are combined, so that as the number of operating units increases, the building used in the power plant,
Vibration applied to other structures increases, and there is a possibility that the life of these buildings and the like may be shortened.

For this reason, conventionally, measures have been taken to reduce vibrations generated from individual turbine generators. However, measures have been taken to reduce vibration between turbine generators that are operated simultaneously as a plurality of hydraulic power plants. Therefore, measures to reduce vibrations at large hydropower plants were insufficient.

[0007]

Accordingly, there has been a demand for a hydroelectric power plant and a method of reducing vibration of a hydroelectric power plant that can reduce vibration when a plurality of turbine generators are operated simultaneously.

The present invention has been made in view of the above circumstances, and provides a hydroelectric power plant and a method of reducing vibration of a hydroelectric power plant that can reduce vibration when a plurality of water turbine power generators are operated simultaneously. The purpose is to do.

[0009]

SUMMARY OF THE INVENTION In order to achieve the above object, a first aspect of the present invention is directed to a hydroelectric power plant in which a plurality of hydroelectric power generation devices are installed. The vibration generated by the device
The gist of the present invention is to provide a hydroelectric power plant characterized by having an anti-phase configuration for reducing vibration.

[0010] In the invention of claim 2 of the present application, the plurality of hydroelectric generators generate vibrations of the same frequency, the phase difference of the vibrations is 180 °, and the plurality of hydraulic power generators are alternately arranged adjacent to each other. The gist of the present invention is a hydroelectric power plant according to claim 1.

According to the third aspect of the present invention, the plurality of hydroelectric generators have the same design and are assembled so as to generate a phase difference of vibration. The gist is that it is a hydropower plant.

According to a fourth aspect of the present invention, in the hydroelectric power plant according to any one of the first to third aspects, the vibration generated from the turbine runner of the hydroelectric power generator is set to the opposite phase. The gist is that there is.

In the invention of claim 5 of the present application, the rotor is
The hydroelectric power plant according to any one of claims 1 to 4, wherein the runner blades are mounted with a mounting deviation with respect to a runner reference point set on the rotor. And

In the invention of claim 6 of the present application, the runner blade is mounted on the rotor with a mounting deviation provided by a coupling provided on the main shaft. The point is that the plant is a hydroelectric power plant described in the section.

According to a seventh aspect of the present invention, a plurality of hydraulic power generators are installed in which the phases of the generated vibrations are in opposite phases to reduce the vibrations, and the vibrations generated from the hydraulic power generators are combined. Accordingly, the gist of the present invention is to provide a method for reducing vibration of a hydroelectric power plant, which is characterized by reducing vibration.

[0016]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a hydraulic power plant and a method of reducing vibration of a hydroelectric power plant according to an embodiment of the present invention.

As shown in FIG. 2, a hydroelectric power plant 1 according to the present invention comprises a plurality of, for example, two hydroelectric power generators 2A and 2B having the same capacity. Has turbines 6a, 6b connected to turbine generators 3a, 3b via couplings 4a, 4b and main shafts 5a, 5b.

The hydroelectric generators 2A and 2B have the same design,
As shown in FIGS. 1 (a) and 1 (b), the production is performed, and using the couplings 4a and 4b, the turbine runners 7a and 7b of the turbines 6a and 6b are connected to the rotors 8a of the turbine generators 3a and 3b. , 8b except for the connection state.

The turbines 6a and 6b are, for example, Francis turbines which are reaction type turbines, and the casings 9a and 9b into which water is introduced via a penstock (not shown) are provided with a change in generator load and a dam. According to the water level of the turbine runner 7a,
Guide vanes 10a for adjusting the amount of water flowing into 7b,
10b, and the guide vane 1
The water turbine runners 7a and 7b, which serve as main vibration generation sources, are provided with the water introduced by Oa and 10b.

As shown in FIGS. 1A and 3, one of the turbine runners 7a is, for example, one end of a runner blade 12a with respect to a runner reference point 11a set on a rotor 8a of the turbine generator 3a. The coupling 13a is connected by the coupling 4a so that 13a coincides with the axis 14a passing through the runner reference point 11a.

On the other hand, the other turbine runner 7b
For example, one end portion 13b of the runner blade 12b is moved with respect to the axis 14b passing through the runner reference point 11b.
Are connected by a coupling 4b so as to have an attachment deviation L with respect to one end 13a. This makes it possible to easily provide a phase difference between the vibration generated from the turbine runner 7b and the vibration generated from the turbine runner 7a.

Since the hydroelectric generators 2A and 2B are designed and manufactured identically, the runner reference points 11a and 11b are located at the same position as shown in FIG.
a and 14b also pass through the same position with respect to the hydroelectric generators 2A and 2B.

The hydroelectric power plant 1 sets the phase of the vibration generated from one of the hydroelectric generators 2A and the phase of the vibration generated from the other hydraulic power generator 2B provided in close proximity to each other, for example, a phase difference. By setting the angle to 180 °, the combined vibrations are attenuated.

Accordingly, as shown in FIG. 3, for example, the number of poles of the turbine generators 3a and 3b is 12, the runner blades 12a and 1
The number of 2b is 6, the number of rotations is 600 rpm, and the turbines 6a and 6
If the vibration frequency generated from b is 180 Hz, the water turbine runners 7a and 7b make one rotation, so that 18 vibrations will be generated.
In order to make the angle?, An attachment deviation amount of L = 360/18 x 2 = 10 should be considered.

Further, below the water turbine runners 7a and 7b,
Suction pipes 15a and 15b are provided, which flow through the water turbine runners 7a and 7b and through which the water flows through the water turbine runners 7a and 7b.

Next, a method for reducing vibration of a hydroelectric power plant and a hydroelectric power plant according to the present invention will be described.

[0027] The hydraulic power generator 2 is connected to the dam via a penstock.
The water introduced into the casing 9a of the A
0a is guided into the turbine runner 7a of the turbine 6a,
Acts on the runner blades 12a to rotate the water wheel runner 7a. The rotation of the turbine runner 7a causes the coupling 4a to rotate.
The rotor 8a connected to the turbine runner 7a through the rotor rotates and causes the turbine generator 3a to generate power.

During the power generation process by the hydraulic power generator 2A, the turbine runner 7a and the rotor 8a
Since the rotor rotates at 0 rpm, the guide vane 10a and the runner blades 12a generate vibration mainly from the turbine runner 7a and further from the guide vane 10a.
The amplitude of the vibration generated from the water turbine runner 7a has a substantially sinusoidal shape with the passage of time.

On the other hand, similarly to the hydroelectric generator 2A,
The water introduced into the casing 9b of the hydroelectric generator 2B is
Guided by the guide vanes 10b, the water enters the turbine runner 7b of the turbine 6b, and acts on the runner blades 12b to rotate the turbine runner 7b. Due to the rotation of the turbine runner 7b, the rotor 8b connected to the turbine runner 7b via the coupling 4b rotates, causing the turbine generator 3b to generate power.

In the process of power generation by the hydraulic power generator 2B, the rotor 8b rotates at a rotation speed of 600 rpm, so that vibration is generated from the water turbine runner 7b as in the water turbine runner 7a. The vibration generated from the turbine runner 7b is
The vibration, amplitude and wavelength generated from the water turbine runner 7a are the same.

However, the vibration generated from the turbine runner 7b is such that the runner blades 12b are mounted with a deviation of 10 ° with respect to the axis 14b passing through the runner reference point 11b, that is, as shown in FIG. Is mounted so as to be deviated by 10 ° with respect to the runner blade 12a,
The phase difference is 1 with respect to the vibration generated from the turbine runner 7a.
80 °.

The water turbine runner 7 serving as the main vibration source
The vibrations generated from a and 7b are combined and reduced,
Shock due to vibration applied to buildings and other equipment in the hydroelectric power plant is reduced, and the life of buildings and other equipment can be extended, and malfunction of equipment can be prevented, reliability can be improved, In addition, the working environment can be improved by reducing noise.

In the above embodiment, the rotor 8
In order to generate a phase difference of 180 ° between the vibration generated from the rotor b and the vibration generated from the rotor 8b, the runner blade 12b is provided with an attachment deviation L by the coupling 4b. The mounting position may be changed to have a mounting deviation, or the mounting position of the main shaft and the turbine may be changed to have a mounting deviation.

Furthermore, the vibration can be reduced even if the phase difference of the vibration is made 180 ° by changing the guide vane mounting position of the water wheel.

Further, when three or more hydraulic power generators are installed, the hydraulic power generators whose vibrations differ in phase difference by 180 ° may be arranged alternately and adjacently.

[0036]

As described above, the present invention can provide a hydroelectric power plant and a method of reducing vibration of a hydroelectric power plant that can reduce vibration when a plurality of turbine generators are operated simultaneously. .

That is, in a hydropower plant in which a plurality of hydropower devices are installed, these hydropower devices are
Since the vibrations generated from these hydropower units are configured to have the opposite phases to reduce the vibrations, the vibrations generated from the multiple hydropower units are attenuated, and the other buildings and other buildings in the hydropower plant Shock due to vibration applied to the equipment is reduced, the life of buildings and other equipment can be extended, furthermore, malfunction of equipment can be prevented, reliability can be improved,
In addition, the working environment can be improved by lowering the noise.

Further, the plurality of hydraulic power generators generate vibrations of the same frequency, and the phase difference of the vibrations is 180 °, and the vibrations are alternately arranged adjacent to each other. The resulting vibration is well reduced.

Further, since the plurality of hydraulic power generators have the same design and are assembled so as to generate a phase difference of vibration, the vibration generated from the plurality of hydraulic power generators is reliably reduced.

Further, since the vibration generated from the turbine runner of the hydraulic power generator is set to the opposite phase, the vibration from the main vibration generating source can be reduced, and the vibration of the entire hydraulic power plant can be effectively reduced.

Further, since the rotor is mounted with a mounting deviation with respect to a runner reference point where the runner blade is set on the rotor, it is possible to easily give a phase difference to the vibration.

Further, since the runner blades are mounted on the rotor with a mounting deviation provided by a coupling provided on the main shaft, in a plurality of hydroelectric generators of the same design,
Vibrations generated from a plurality of runner blades can be easily provided with a phase difference.

Also, a plurality of hydraulic power generators are installed in which the phases of the generated vibrations are in opposite phases to reduce the vibrations, and the vibrations generated from the hydraulic power generators are combined to reduce the vibrations. Since it is a method of reducing vibration of a hydroelectric power plant, the vibration generated from a plurality of
The impact of vibration on buildings and other equipment in the hydroelectric power plant is reduced, and the life of buildings and other equipment can be extended.Furthermore, malfunction of equipment can be prevented.
The reliability can be improved, and the working environment can be improved by lowering the noise.

[Brief description of the drawings]

FIG. 1 is a conceptual diagram showing a mounting relationship between a rotor and a water turbine runner of a hydroelectric power generator used in a hydroelectric power plant according to the present invention.

FIG. 2 is a conceptual diagram of a hydroelectric generator used in the hydroelectric power plant according to the present invention.

FIG. 3 is a conceptual diagram illustrating a relationship between a rotor and a water turbine runner of a hydroelectric generator used in the hydroelectric power plant according to the present invention, and explaining an installation deviation.

FIG. 4 is a conceptual diagram showing a mounting relationship between a rotor and a water turbine runner of a hydraulic power generator used in a conventional power plant.

[Explanation of symbols]

 Reference Signs List 1 Hydroelectric power plant 2A Hydroelectric generator 2B Hydroelectric generator 3a Turbine generator 3b Turbine generator 4a Coupling 4b Coupling 5a Main shaft 5b Main shaft 6a Water wheel 6b Water wheel 7a Water wheel runner 7b Water wheel runner 8a Rotor 8b Rotor 9a Casing 9b 10a Guide vane 10b Guide vane 11a Runner reference point 11b Runner reference point 12a Runner blade 12b Runner blade 13a One end 13b One end 14a Axis 14b Axis 15a Suction pipe 15b Suction pipe

Claims (7)

[Claims] In a hydroelectric power plant in which a plurality of hydroelectric power generators are installed, these hydroelectric power generators are configured such that vibrations generated from these hydroelectric power generators have opposite phases to reduce the vibrations. A hydroelectric power plant characterized by the following. 2. The plurality of hydroelectric generators generate vibrations of the same frequency, the vibrations have a phase difference of 180 °, and are arranged alternately and adjacently. 2. A hydroelectric power plant according to claim 1. 3. The hydroelectric power plant according to claim 1, wherein the plurality of hydroelectric devices have the same design and are assembled so as to generate a vibration phase difference. 4. The hydroelectric power plant according to claim 1, wherein vibrations generated from a water turbine runner of the hydroelectric power generator are set to have opposite phases. 5. The rotor according to claim 1, wherein the rotor is mounted with a mounting deviation with respect to a runner reference point at which the runner blade is set on the rotor. Hydroelectric power plant as described. 6. The runner blade according to claim 1, wherein the runner blade is mounted on the rotor with a mounting deviation provided by a coupling provided on a main shaft.
A hydroelectric power plant according to the item. 7. A plurality of hydraulic power generators whose phases are opposite to each other to reduce vibrations are installed, and vibrations generated by the hydraulic power generators are combined to reduce the vibrations. A method for reducing vibration of a hydroelectric power plant, characterized in that: