JPS5870069A - How to idle a water turbine or pump water turbine - Google Patents

Abstract

PURPOSE:To prevent acting of an abnormal thrust to the main shaft of a runner when current supply to a solenoid valve is interrupted during racing of the runner, by closing an automatically operated valve disposed in a water return pipe communicated with a runner side chamber. CONSTITUTION:At a portion of a water return pipe 9, there is provided an automatically operated valve 10 which is driven by a double solenoid valve 12 and kept open when current supply is interrupted. Therefore, if current supply to the solenoid valve is interrupted during racing operation of a runner 1 while discharging water through the water return pipe 9, an automatic valve 8 is closed while the valve 10 is kept open. Resultantly, pressure in a runner back- pressure chamber is raised with pressure in a runner side chamber 13 being kept low, so that the production of an abnormal downward thrust can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for idling a water turbine or a pump water turbine.

Generally, in water turbines or pump water turbines, especially in high head water turbines or pump water turbines, the flow of water into the runner chamber is stopped during pump startup operation, phase adjustment operation, etc., and the water is turned off during idle operation.
In order to reduce starting torque and temperature rise inside the runner, a leak pipe is provided to drain water leaking from the guide vanes and draining water remaining around the runner when compressed air is introduced to push down the water surface.

Conventionally, it has been common to provide one leakage pipe in the runner side chamber and one between the guide vane and the runner. By the way, if the control solenoid valve that opens and closes the pressure oil passage of the automatic on-off valve that opens and closes each of these leakage pipes is a dual-action solenoid valve that maintains its current position in the event of a power loss, idling will occur. If the DC (direct current) power supply that is the control power supply is lost during the operation, the draft water level will start to rise due to the inability to supply air, and eventually shut-off operation will occur. As for the leakage pipe, the control solenoid valve remains open, so the pressure in the runner side chamber remains low.

On the other hand, there was a drawback in that the pressure in the runner backpressure chamber increased, resulting in abnormal downward thrust, which gave a large thrust to the thrust metal.

In addition, if both control solenoid valves are single-type ones that automatically close when DC power is lost, the above drawbacks can be eliminated, but water may accumulate in the runner chamber and between the runner and the guide vane. Furthermore, as the runner rotates, heat is generated due to friction between the runner and the water, and between the water, resulting in an abnormal increase in the temperature inside the runner.

The present invention has been made in view of the above-mentioned circumstances, and an object of the present invention is to provide a method for idling a water turbine or a pump-turbine, which can prevent the occurrence of abnormal thrust of the runner main shaft and also prevent an abnormal rise in temperature in the runner chamber. This is what I did.

The method of idling a water turbine or a pump water turbine according to the present invention is as follows.

The runner is fixed to the main shaft supported via a bearing, and automatic opening/closing valves driven by electromagnetic valves are installed in the runner side chamber and between the runner and the guide vane, and a leakage pipe is installed to drain water that has flowed into the runner chamber. When the runner is rotated with the automatic on-off valve of the water leakage pipe h open, and the power to the solenoid valve is lost during one idle rotation of the runner, the runner is connected to the side chamber of the runner. This is an operating method that closes the automatic on-off valve of the leakage pipe.

An example of the method for idling a water turbine or pump water turbine according to the present invention will be explained below with reference to the drawings. In the figure, 1 is a runner, which is arranged vertically and has thrust bearings (not shown).
It is fixed to a main shaft 4 supported by. 2 is the top cover,
3 is the lower cover, 5 is the suction pipe.

6 is a guide vane. Reference numeral 7 denotes a water leakage pipe that communicates with the runner side chamber 13 on the upper side of the lower cover 3, and the water leakage pipe 7 is connected to the water leakage pipe 7 through a single solenoid valve 11 that closes the pressure oil passage by the tension of a spring 14 when the power is lost. An automatic opening/closing valve 8 that is driven to close is attached. Reference numeral 9 denotes a leakage pipe connected between the runner 1 and the guide vane 6 to drain water, and the leakage pipe 9 is driven via a dual solenoid valve 12 that maintains the open position when power is lost. Automatic on-off valve 1
0 is attached. Therefore, the single solenoid valve 1 prevents water leaking into the runner chamber where the runner 1 is rotationally driven.
The runner 1 is idling while water is being drained through the leakage pipe 7 equipped with an automatic opening/closing valve 8 opened by the valve 1 and the leakage pipe 9 equipped with the automatic opening/closing valve 10 opened by the dual solenoid valve 12. When the electromagnetic valve loses power, the automatic on-off valve 8 closes and the automatic on-off valve 9 remains open. Therefore, unlike in the past, the pressure in the runner side chamber 13 remains low and the pressure in the runner back pressure chamber rises, causing an uneven thrust. Since the water is drained away, an abnormal rise in temperature inside the runner is also prevented.

In this way, in the idling four-wheel rotation method of a water turbine or a pump water turbine, when the control valve loses power, drainage of the runner side chamber is stopped and water is stored in the runner side chamber, which prevents the generation of unsuitable thrust. Since the water between the runner and the guide vane is continuously drained, water does not accumulate in the runner chamber, and an increase in the indoor temperature can be avoided.

As described above, according to the method for idling a water turbine or pump water turbine of the present invention, it is possible to prevent abnormal thrust of the runner main shaft and also to prevent an abnormal rise in temperature in the runner chamber.

[Brief explanation of the drawing]

The figure is a sectional view of a main part of an apparatus for carrying out the method for idling a water turbine or a pump-turbine according to the present invention. 1... Runner, 4... Main shaft, 6... Guide vane, 7゜9... Leak pipe, 8, 10... Automatic on-off valve,
11... Single procedural amendment (voluntary) 3. □. '*4B ``'' [3 To Mr. Haruki Shimada, Commissioner of the Japan Patent Office' Indication of the subject 1982 Patent Application No. 167072 Name of the invention
Title: A water turbine is a person who corrects the idling operation method of a pump-turbine. ”
Correct the description in ``When idling, drive.'' 2. On page 3, line 9, next to the statement “Although it can be excluded,” “
Add ``in a idling state''. 1. On page 6, lines 1 to 3, "Runner... room temperature" was changed to "On the other hand, it is better to prevent water leakage from the guide vanes from flowing into the runner chamber as much as possible. Since the water is continuously drained, water does not accumulate inside the runner chamber and the pressure inside the runner chamber is reduced. that's all

Claims (1)

[Claims] 1. A runner is fixed to a main shaft supported via a bearing, and between a runner side chamber and the runner and the guide vane,
Each is equipped with an automatic on-off valve driven by a solenoid valve to eliminate water that has flowed into the runner chamber. In the idling operation method in which the runner is rotationally driven with a leakage pipe connected to the water leakage pipe and the automatic opening/closing valve of the water leakage pipe open, when the power to the solenoid valve is lost during the idling operation of the runner, the above-mentioned A method for idling a water turbine or a pump water turbine, characterized by closing an automatic opening/closing valve of a leakage pipe communicating with a runner side chamber. 2. Attach a single solenoid valve to the automatic opening/closing valve of the leakage pipe that communicates with the runner side chamber, and install a dual solenoid valve to the automatic opening/closing valve of the leakage pipe that communicates between the runner and the guide vane to operate the runner. A method for idling a water turbine or a pump water turbine according to claim A1.