JPH05248337A - Guide vane of hydraulic turbine and controller of pressure regulator - Google Patents

Abstract

PURPOSE:To simplify maintenance of a hydraulic power plant having long hydraulic steel pipes by omitting a large-scale pressure oil supply system for actuating the guide vane and the pressure regulator of the hydraulic power plant. CONSTITUTION:A guide-vane driving electric servo motor 6 for opening and closing a guide vane 4 and a pump unit 12 are provided, the pump unit 12 supplying pressure oil to a pressure regulator 11 to cause actuation of the pressure regulator 11 such that the opening motion and the closing motion of the pressure regulator 11 are achieved, respectively, by water pressure and oil pressure. The pressure oil supply system of a hyraulic power plant is thereby miniaturized and the maintenance and inspection of the power plant are simplified and the cost of the power plant is reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control device for a guide vane and a pressure suppressor of a water turbine of a hydraulic power plant having a long penstock.

[0002]

2. Description of the Related Art A turbine is operated at a specified rotation speed when the load is constant. However, when the load changes, the balance between the load and the turbine output is broken, and the rotation speed of the turbine changes. Operates according to the change, and automatically adjusts the opening of the guide vane so that the turbine keeps the specified rotation speed.
The speed governor is composed of a speed detecting unit, a pressure distributing valve, a servo motor, a restoring unit, a speed adjusting unit, a load limiting unit, a manual operation mechanism and the like. Conventionally, the servomotor was controlled by hydraulic pressure, so a pressure oil device was required.

It is desirable for the speed governor of a water turbine to close the water outlet promptly so that the change in speed is kept to a minimum when the load on the water turbine is cut off, but this results in a rapid change in the flow rate. The fluctuation of the water pressure becomes large, and the speed fluctuation becomes large if the closing time of the water port is lengthened in order not to make the fluctuation of the water pressure large. A pressure suppressor is provided to satisfy these conflicting requirements to some extent. In hydroelectric power stations with long penstocks, pressure suppressors will be installed in order to keep the rise in water pressure of the turbine and penstock when load is cut off. The suppressor is
When the guide vanes are closed rapidly, the water in the pipeline is rapidly released to the other in conjunction with this, and after the guide vanes are closed, it is placed in the casing or a hydraulic pipeline near the casing to gradually stop the discharge of water. To be done. When the load suddenly decreases and the guide vanes close suddenly, the valve body of the pressure suppressor opens and drains. When the valve body opens once and there is no concern about pressure increase, the valve body is gradually closed. Conventionally, the opening operation of the pressure suppressor is performed by water pressure, and the closing operation is performed by using both the hydraulic pressure and the weight.

[0004]

Conventionally, since hydraulic pressure is used to control the servomotor and the pressure suppressor of the speed governor,
A pressure oil system is required. The pressure oil device is usually composed of an oil pump and its drive device, a pressure oil tank, an oil collecting tank, an oil cooling device, an oil pipe and the like. Therefore, the pressure oil device has been a factor of increasing the cost of the hydroelectric power plant.

An object of the present invention is to provide a control device for a guide vane and a pressure suppressor of a water turbine, which omits a large-scale pressure oil device for operating the guide vane and the pressure suppressor of a water turbine of a hydroelectric power plant and simplifies maintenance. To do.

[0006]

In a water turbine of a hydroelectric power plant having a long penstock and a guide vane and a pressure suppressor, an electric servomotor for opening and closing the guide vane and an opening operation of the pressure suppressor are hydraulic pressure. The above-described object is achieved by providing a pump unit for supplying pressure oil to the pressure suppressor so that the above operation and the closing operation are performed by hydraulic pressure.

Further, if the opening operation time of the pressure suppressor is short and the closing operation time thereof is long, it is suitable for downsizing the pressure oil device.

Further, if the pump unit for supplying pressure oil to the pressure suppressor is composed of a small pump and a motor, it is suitable for downsizing the hydraulic system.

[0009]

In the present invention, since the servomotor for opening and closing the guide vanes is an electric servomotor, pressure oil is unnecessary. However, because the thruster has a large thrust when it is opened and operates in a short time, the electric servomotor cannot be large in size, so the opening action of the pressure suppressor depends on the water pressure. Although the closing operation of the pressure suppressor is performed for a long time, since this also has a large thrust and cannot be handled by the electric servomotor, a unit type small pressure oil device is provided. In this way, the pressure oil for controlling the guide vanes can be omitted, and the closing operation of the pressure suppressor can be controlled by the pump unit to simplify the maintenance of the pressure oil device.

[0010]

1 is a system diagram of a control device for a guide vane and a pressure suppressor of a water turbine according to an embodiment of the present invention. Water flowing in through the casing 3 rotates the runner 2 connected to the lower end of the main shaft 1 through the guide vanes 4, and the suction pipe 5
Is discharged to. In the present invention, the guide vane 4
Is to open and close the guide vanes 4 by rotating the guide ring 4a by the electric servomotor 6 for driving the guide vanes, which is composed of a brushless motor and an electric operating device. The electric servomotor 6 for driving the guide vanes is a guide vane electrical parts box 7
It is controlled by the signal from.

The pressure suppressor 11 comprises a control pressure distribution valve 9 and a valve body 10. In the present invention, the pressure suppressor 11
Pump unit 1 for supplying pressure oil so that the opening operation of the valve is operated by water pressure and the closing operation of the valve is operated by hydraulic pressure.
2 was provided. The pump unit 12 is composed of a small pump and a motor. The link 8 is connected to the lever 6a of the electric servomotor 6 for driving the guide vane and the lever 9a of the pressure regulating valve for the pressure suppressor. The valve body 10 is affected by the water pressure in the casing, but when the water pressure is normal, the valve body 10 is closed by the hydraulic pressure acting on the servomotor 10a from the pressure regulating valve 9. When the load suddenly decreases, the link 8 moves in the direction of the arrow simultaneously with the closing of the guide vane, the lever 9a of the pressure regulator valve 9 moves in the direction of the arrow, and the pressure regulator valve 9 moves the servomotor 10a of the servomotor 10a. The oil is discharged to reduce the pressure, and the valve body 10 is rapidly opened in a short time. At this time, the opening degree of the valve body 10 is determined by the pressure regulator pressure distribution valve 9. In Japan, when the load of the hydroelectric power plant is cut off, the so-called water-saving operation is performed in which the guide vanes are closed and the valve body 10 of the pressure suppressor 11 is rapidly opened to release water, and then the valve body 10 is loosely closed. Therefore, the pump unit 12 that supplies the pressure oil to the pressure suppressor 11 needs only a small capacity.

[0011]

According to the present invention, the opening / closing of the guide vane is controlled by the electric servomotor, and the opening operation of the pressure suppressor uses water pressure and the closing operation uses pressure oil from the pump unit. Becomes smaller, simplifies the maintenance and inspection of the pressure oil system and reduces the cost of the hydroelectric power station compared with the conventional one.

[Brief description of drawings]

FIG. 1 is a system diagram showing a control device for a guide vane and a pressure suppressor of a water turbine according to an embodiment of the present invention.

[Explanation of symbols]

 1 main shaft 2 runner 3 casing 4 guide vane 5 suction pipe 6 electric servomotor for driving guide vane 7 guide vane electric parts box 8 link 9 pressure regulator valve 10 valve body 11 pressure suppressor 12 pump unit

Claims (3)

[Claims] 1. In a water turbine of a hydroelectric power plant having a long penstock and a guide vane and a pressure suppressor, an electric servomotor for opening and closing the guide vane and an opening operation of the pressure suppressor are actuated by water pressure and closed. A control unit for a guide vane of a water turbine and a pressure suppressor, which is provided with a pump unit for supplying pressure oil to the pressure suppressor so that the operation is performed by hydraulic pressure. 2. The control device for a guide vane and a pressure suppressor of a water turbine according to claim 1, wherein the opening time of the pressure suppressor is short,
A control device for a guide vane and a pressure suppressor of a water turbine, which has a long closing time. 3. A control unit for a guide vane of a water turbine and a pressure suppressor according to claim 1, wherein a pump unit for supplying pressure oil to the pressure suppressor is composed of a small pump and a motor. Control device for guide vanes and pressure suppressors.