JPH09303301A - Direct pressurization type oil pressure supply system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an oil pressure supply system to be arranged in the top cover of a bulb turbine by dispensing with an oil pressure tank to control a runner vane of a bulb turbine, and miniaturizing it. SOLUTION: An oil pressure supply system comprises a servo valve 2 to introduce the pressure oil to the open side or the closed side of a runner vane servo motor 1 by the electric signal from a highly efficient operation equipment 8, an oil collection tank 5, and a variable displacement pressurizing pump 3a which supplies the oil pumped from the oil collection tank 5 to the servo valve 2, and in which the flow rate is kept constant before the pressure of the discharged oil reaches the prescribed value, and the flow rate becomes zero when the pressure of the discharged oil reaches the prescribed value, and the system is arranged in a top cover of a bulb turbine, and the oil pressure supply system can be compact in size, and a building of a power station can be miniaturized.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pressure oil device for supplying pressure oil to a runner vane servomotor for controlling opening / closing of a runner vane of a valve turbine.

[0002]

2. Description of the Related Art FIG. 3 is a system diagram of a conventional runner vane controller. In FIG. 3, the solid line indicates the pressure oil system, the broken line indicates the oil discharge system, and the alternate long and short dash line indicates the electric signal system. A conventional pressure oil device for driving a runner vane includes a servo valve 2 for supplying pressure oil to a runner vane servomotor 1 via an oil supply pipe 13, an oil collecting tank 5, and a constant volume pressure oil pumping oil in the oil collecting tank 5. It was composed of a pump 3, a pressure oil tank 6 for keeping oil at a predetermined pressure and storing it, a cooler 4 for cooling the oil in the oil collecting tank 5, and an unloader valve 7 as a directional control valve. When the pressure oil tank 6 maintained the prescribed amount and pressure of oil, the oil was bypassed from the unloader valve 7 provided at the outlet of the constant volume pressure oil pump 3, and the constant volume pressure oil pump 3 was continuously operated. When controlling the runner vane servomotor 1, the electric signal from the runner vane opening transmitter 9, the electric signal from the guide vane opening transmitter 10 and the electric signal from the water level adjusting device 11 are input to the high efficiency operation device 8. ,
A signal is input from the high-efficiency operating device 8 to the pressure distribution valve 2, the valve of the pressure distribution valve 2 is opened / closed, and the pressure oil from the pressure oil tank 6 is sent to the runner servomotor 1 to open / close the runner vane.

[0003]

When the pressure oil tank has a prescribed oil amount and pressure, an unloader valve 7 is provided at the outlet of the constant volume pressure oil pump 3 to bypass the oil, and the constant volume pressure oil pump 3 is It was running continuously. Therefore, since this device requires a large space, the pressure oil devices are centrally arranged at one corner in the power plant and are guided to the runner vane servomotor 1 that drives the runner vanes by piping.

The present invention provides a pressure oil device for omitting a pressure oil tank for controlling a runner vane of a valve water turbine, simplifying the mechanism, and downsizing the device and arranging the pressure oil tank in a top cover of the valve water turbine. It is an issue.

[0005]

In a pressure oil device for supplying pressure oil to a runner vane servomotor of a valve turbine, the pressure oil is guided to an open side or a closed side of the runner vane servomotor by an electric signal from a high efficiency operation device. Servo valve,
The oil collection tank and the oil pumped from the oil collection tank are supplied to the servo valve, and the flow rate is kept constant until the pressure of the discharged oil reaches a predetermined value, and the pressure of the discharged oil is determined. The above problem is solved by being configured with a variable displacement pressure oil pump whose flow rate becomes zero when it reaches a certain value. The pressure oil device is arranged in the top cover. According to this pressure oil device, the servo valve is operated by an electric signal from the high-efficiency operation device, and the pressure oil from the variable displacement pressure oil pump is guided to the open side or the close side of the runner vane servomotor via the servo valve, The runner vanes can be opened and closed. When the runner vane is not driven, the servo valve is closed and the amount of oil in the variable displacement pressure oil pump becomes zero, but the pressure oil pump is always operating and the responsiveness of the servo motor is maintained.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a system diagram of a direct pressurization type pressure oil device for a runner vane showing an embodiment of the present invention.
1, the same parts as those in FIG. 3 are designated by the same reference numerals.
In the pressure oil device according to the present invention, the outlet side is connected to the runner vane servomotor 1 via the oil supply pipe 13, and the pressure oil is guided to the open side or the closed side of the runner vane servomotor 1 by an electric signal from the high efficiency operation device 8. The servo valve 2, the oil collecting tank 5, the cooler 4 for cooling the oil in the oil collecting tank 5, the oil pumped from the oil collecting tank 5 is supplied to the servo valve 2, and the pressure of the discharged oil is determined. The flow rate is kept constant until the value reaches a predetermined value, and when the pressure of the discharged oil reaches a predetermined value, the flow rate becomes zero. It is arranged in the cover 12.

FIG. 2 is a block diagram of a valve turbine equipped with the direct pressure type hydraulic oil device of FIG. In FIG. 2, an electric signal from the runner vane opening transmitter 9, an electric signal 10 from the guide vane opening transmitter, and an electric signal from the water level adjusting device 11 are input to the high-efficiency operating device 8 to operate the servo valve 2. Then, the pressure oil of the variable displacement pressure oil pump 3a is guided to the pressure oil introducing device 14 through the oil supply pipe 13, and the pressure oil is supplied to the open side or the close side of the runner vane servomotor 1 through the hollow main shaft, and the runner vane 15 Open and close. The oil in the oil collecting tank 5 is stored at atmospheric pressure, and is raised to a prescribed oil pressure by the variable displacement oil pump 3a. When opening the runner vane 15, the servo valve 2 is activated by a signal from the high efficiency operation device 8.
Moves to the open side, and the oil generated in the variable displacement pressurizing pump 3a is guided to the open side of the runner vane 1 to open the runner vane 15. When the runner vane opening degree reaches a predetermined opening degree, a signal from the runner vane opening degree transmitter 9 causes the high-efficiency operation driving device 8 to output an operation end signal, the servo valve 2 returns to the neutral position, and the variable displacement pressure is returned. The outlet of the oil pump 3a is blocked and the pressure oil is shut off. At this time, the variable displacement pressure oil pump 3a is operated at a flow rate of zero. Since the variable displacement pressure oil pump 3a is constantly operated, it is possible to introduce the pressure oil of the specified pressure to the runner vane servomotor 1 without a time delay when changing the runner vane opening.

[0008]

According to the present invention, a pressure oil device for controlling a runner vane servomotor comprises a servo valve, a variable displacement pressure oil pump and an oil collecting tank, and is installed in the top cover of a valve turbine. It With this pressure oil device, the servo valve is operated by the signal from the high-efficiency operation device installed outside the valve, and the pressure oil of the variable displacement pressure oil pump is guided to the runner vane servomotor via the servo valve to open and close the runner vane. be able to. According to this invention, since the pressure oil tank can be omitted, the whole pressure oil device can be made compact and can be stored in the top cover of the valve turbine,
Moreover, this eliminates the need for piping outside the valve and reduces the size of the power plant building. Further, since the pressure oil device is installed near the runner vane servomotor, it is possible to reduce the time delay from the transmission of the control signal to the start of the runner vane operation.

[Brief description of drawings]

FIG. 1 is a system diagram of a runner vane direct-pressurization type pressure oil device showing an embodiment of the present invention.

2 is a configuration diagram of a valve turbine including the pressure oil device of FIG. 1. FIG.

FIG. 3 is a system diagram of a conventional runner vane pressure oil device.

[Explanation of symbols]

 1 runner vane servo motor 2 pressure distribution valve 3 constant capacity oil pump 3a variable capacity oil pump 5 oil collection tank 8 high efficiency operation device 9 runner vane opening transmitter 12 top cover 13 oil supply pipe 15 runner vane

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Shoichi Yamato 1-1 Tanabe Nitta, Kawasaki-ku, Kawasaki-shi, Kanagawa Fuji Electric Co., Ltd. (72) Shinichi Takahashi 1 Nitta Tanabe, Kawasaki-ku, Kawasaki-shi, Kanagawa No. 1 inside Fuji Electric Co., Ltd.

Claims (1)

[Claims] 1. A pressure oil device for supplying pressure oil to a runner vane servomotor of a valve turbine, and a servovalve for guiding the pressure oil to an open side or a closed side of the runner vane servomotor by an electric signal from a high efficiency operation device, The oil collection tank and the oil pumped from the oil collection tank are supplied to the servo valve, and the flow rate is kept constant until the pressure of the discharged oil reaches a predetermined value, and the pressure of the discharged oil is determined. A direct-pressurization type pressure oil device for a runner vane, which comprises a variable displacement pressure oil pump whose flow rate becomes zero when a predetermined value is reached.