JPH1130206A - Operating oil supplying device for hydraulic turbine governor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an operating oil supplying device for a hydraulic turbine governor, which does not allow its operation time to change even when the ambient temperature varies and variations in the operating oil temperature cause variations in viscosity. SOLUTION: Onto an inlet side pipe line 7 and an outlet side pipe line 9 of a distributing valve 4 which changes over the flow channel of operating oil fed to and discharged from a hydraulic servomotor 5 of a hydraulic turbine governor, operating oil temperature control devices 14 are provided to adjust the temperature of the operating oil to a specified value. Further, each operating oil temperature control device 14 is provided with an oil accumulation tank 13 connected to inlet and outlet pipe lines and a heater 11 installed in the vicinity of this oil accumulation tank 13.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an operating oil supply device for a water turbine governor, and more particularly to a hydraulic servo mechanism for operating a switchgear for adjusting an inflow water amount of a governor for controlling the rotation speed of a water turbine. Operation oil supply for a water turbine governor, by keeping the oil temperature constant, so that even if the ambient temperature changes, the operation time does not change due to the difference in viscosity due to the temperature change of the operation oil. Related to the device.

[0002]

2. Description of the Related Art The operating oil supplied to the governor of a water turbine is shown in FIG.
As shown in FIG. 1, a hydraulic oil device including a hydraulic oil pump 1, an oil collecting tank 2, and a hydraulic oil tank 3 is connected to a hydraulic servomotor 5 via a pressure distribution valve 4. This connection is connected to the fuel line 7,
The open pipe 8, the closed pipe 9 and the return pipe 10 are used. The hydraulic servomotor 5 drives an opening / closing device for adjusting the amount of inflow water into the water wheel 6. The opening and closing time of the switching device is adjusted by adjusting the amount of operation of the pressure distribution valve 4 so that the opening time and the closing time can be set separately.

Here, the temperature of the pressure oil sent from the pressure oil device differs depending on the ambient temperature at that time. In the case of a power plant in which the ambient temperature changes greatly, the heater 11 and the cooler 12 are provided in the oil collection tank 2. Are provided. However, even if the temperature inside the oil collecting tank 2 is adjusted by the heater 11 and the cooler 12 to obtain a predetermined temperature, when the temperature reaches the governor via the pressure oil tank 3, the temperature deviates from the predetermined temperature. Will be lost. This is especially likely in winter and summer. In addition, when the operating pipes on the open side and the closed side coming out of the pressure distribution valve 4 are relatively far from the hydraulic servomotor 5, or the hydraulic servomotor 5 is installed near a basement or a water tank. Causes abnormally low oil temperature. Conversely, the oil temperature may rise above a predetermined value due to a rise in the outside air temperature in summer. In such a case, the temperature of the operating oil changes, and hence the viscosity changes. Therefore, even if the throttle mechanism for adjusting the oil supply pressure and the opening and closing time is constant, the operating time deviates from a predetermined value and the oil temperature is low. Increases the operation time,
If the oil temperature is high, the operation time will be short.

[0004]

In the case of a hydroelectric power plant, a waterway or penstock is long, and if the operation time for adjusting the amount of inflow water is delayed with respect to a predetermined time, the rotation speed of the water turbine and the generator becomes high, which is dangerous. On the contrary, if the operation is accelerated, the pressure inside the penstock rises abnormally, so it is important to keep the operation time constant.

[0005] Accordingly, the present invention provides a method for controlling
An object of the present invention is to provide an operation oil supply device for a water turbine governor in which the operation time does not change due to a difference in viscosity due to a change in temperature of the operation oil.

[0006]

In order to achieve the above object, an invention according to claim 1 is provided with a pressure control valve for switching a flow path of operation oil supplied to and discharged from a hydraulic servomotor of a water turbine governor. An operating oil temperature adjusting device for adjusting the temperature of the operating oil to a predetermined value is provided in the side pipe and the outlet side pipe. Further, the invention according to claim 2 is characterized in that the operation oil temperature adjusting device includes an oil storage tank connected to an inlet pipe and an output pipe, and a heater provided near the oil storage tank. Configuration.

According to the first aspect of the present invention, the viscosity of the operating oil at the pressure distribution valve having the largest flow resistance in the hydraulic flow path of the water turbine governor is adjusted to a predetermined value. Can be operated at speed. Claim 2
According to the invention described in (1), since the oil storage tank is provided, a sufficient amount of operation oil for driving the hydraulic servomotor can be adjusted to a predetermined temperature.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention cannot be used because it is impossible to always maintain a constant temperature inside a building of a power plant, and there is no effect even if the oil temperature adjustment of only a pressure oil device is performed. It is characterized by locally adjusting the temperature of the portion to be used and the amount of oil to be used, and its embodiment is described below.

As shown in FIG. 1, the governor actuator adjusts the opening time by adjusting the area through which the operating oil flows by the upward movement amount a of the pressure distribution valve 4. The closing time is adjusted by adjusting the downward movement amount b. Here, there are three operation oil pipes flowing into the pressure distribution valve 4, that is, the oil supply 7, the open side 8, and the closed side 9. Therefore, an oil storage tank 13 having a predetermined capacity is provided in each pipe, and these oil storage tanks are adjusted to a predetermined temperature.

That is, by providing the operation oil temperature adjusting device 14 immediately before the oil supply pipe 7 for supplying oil to the pressure distribution valve 4, even if the temperature of the operation oil between the pressure oil tank 3 and the actuator is equal to the ambient temperature, the pressure distribution valve 4 Can be set to a predetermined temperature. The operating oil supplied by the operating position of the pressure distribution valve 4 is distributed to the open side or the closed side. However, if the operation oil is operated in the open direction, the oil supply pressure passes to the open side and the other closed side Is discharged through the pressure distribution valve 4. If the closed-side oil amount becomes the same as the ambient temperature between the servo motor 5 and the actuator, the operation time differs from a predetermined value due to a change in oil temperature when passing through the pressure distribution valve 4. For this reason, the operation oil temperature adjusting device 14 having a predetermined capacity is also provided in the closed circuit. When the pressure distribution valve 4 moves in the closing direction, the operation opposite to the above is performed. Therefore, an operation oil temperature adjusting device 14 having an oil storage tank 13 having a predetermined capacity is provided in the middle of the open operation pipe 8.

Therefore, the operating oil temperature adjusting device 14 is provided near the pressure distribution valve 4, has an oil storage tank 13 on each of the oil supply 7, the open side 8 and the closed side 9, and operates a container surrounding the oil storage tank 13. The structure is such that a constant temperature is maintained by the heater 11. The capacity of the oil storage tank 13 takes into consideration the flow rate of the hydraulic servomotor 5 caused by the stroke. However, the passing flow rate in the case of normal stable operation is very small.

As shown in FIG. 1, the structure of the operation oil temperature adjusting device 14 is such that oil storage tanks 13 are separately provided on the oil supply side 7, the open side 8 and the close side 9, and the oil temperature is adjusted by the heater 11 and the like. As shown in FIG. 2, there are two types, one of which has a lubricating side 7, the other of which is open 8 and a side of which is closed 9 in a container having the same heat-insulating function and simultaneously adjusts the temperature. By maintaining the temperature at a predetermined value, it is possible to prevent an increase in pressure or an increase in the number of revolutions generated in the water turbine or the iron pipe due to a change in operation time.

It is necessary to avoid the occurrence of abnormal water pressure in the casing, cover and penstock forming the flow path of the water turbine 6 due to the change of the operation time of the inflow water amount adjustment. In addition, the rotation must not increase due to the strength, safety, and system operation of the turbine runner and generator. The most likely to cause these phenomena is a change in the operation time, and temperature control of the operation oil in hydraulic control is an important factor. According to the present embodiment, the operation time is controlled by the operation oil temperature adjustment devices 14 on the oil supply side 7, the open side 8, and the close side 9 provided near the actuator without adjusting the temperature of the entire power plant with respect to the oil temperature adjustment. Is supplied to the pressure distribution valve 4 where the pressure is adjusted, a predetermined operation time is always maintained. As a result, the above-described abnormalities in water pressure and increase in the number of rotations can be reliably prevented.

[0014]

As is apparent from the above description, according to the operating oil supply device for a water turbine governor of the present invention, the temperature of the operating oil is maintained at a predetermined value regardless of the ambient temperature of the water turbine governor. Since the adjustment can be performed, the governor can be operated in a predetermined operation time.

[Brief description of the drawings]

FIG. 1 is a diagram showing a first embodiment of the present invention.

FIG. 2 shows a second embodiment of the present invention.

FIG. 3 is a diagram showing a conventional operation oil supply device for a water turbine governor.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Pressure oil pump, 2 ... Oil collection tank, 3 ... Pressure oil tank, 4 ... Pressure distribution valve, 5 ... Hydraulic servomotor, 6 ... Waterwheel, 7 ... Oil supply pipe, 8 ... Open side pipe, 9 ... Closed side pipe, 1
0: return pipe, 11: heater, 12: cooler, 13
... Oil storage tank, 14 ... Operating oil temperature controller, a ... Open time adjustment amount, b ... Close time adjustment amount.

Claims (2)

[Claims] An operation for adjusting a temperature of the operating oil to a predetermined value in an inlet pipe and an outlet pipe of a pressure distribution valve for switching a flow path of an operating oil supplied to and discharged from a hydraulic servomotor of a water turbine governor. An operation oil supply device for a water turbine governor, comprising an oil temperature adjustment device. 2. The operating oil temperature control device according to claim 1, further comprising an oil storage tank connected to the inlet pipe and the outlet pipe, and a heater provided near the oil storage tank. 1
An operation oil supply device for a water turbine governor according to the above.