JPS62129577A - Guide vane control device - Google Patents

Abstract

PURPOSE:To improve the reliability of performance by detecting the improper function of a discharge valve through the operation of a pseudo-device on an open signal for the discharge valve and the comparison of the function of the pseudo-device with a feedback signal for a discharge valve servo motor, and controlling closing speed for a guide vane according to a result detected therefrom. CONSTITUTION:There are provided a lever 1 for transmitting the same signal as an open signal to a main servo motor, and a pilot valve 4 for opening and closing a pseudo-servo motor 5. And when the level 1 has been lowered according to an open signal for a discharge valve, the plunger of said valve 4 is lowered on synchronization and pressurized oil PO is introduced below the piston of the pseudo-servo motor 5, thereby causing said piston to slide for opening the discharge valve. Also, during the foregoning process, a lever 7 is actuated by a cam 8 on a feedback shaft 9 rotated with the main servo motor. When the working direction of the lever 7 does not agree to that of the pseudo-servo motor 5, and pressurized oil PO is fed to and 'A' system through a changeover valve 6, thereby changing the closing speed of a guide vane to a slow mode.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a hydraulic machine having a discharge valve, and in particular to a device for detecting malfunction of the discharge valve and gently closing a guide vane of hydraulic power*m. It is about providing.

[Background of the invention]

A discharge valve is installed for the purpose of supplying water stored in a dam to the downstream side, but when operated in conjunction with hydroelectric power generation equipment, it serves the following purposes.

(1) Use as a pressure suppressor to alleviate the rise in water pressure in iron pipes caused by the water hammer phenomenon when a water turbine stops due to an accident (when the guide vane of a water turbine suddenly closes).

(2) Securing the amount of water discharged downstream (the sum of the amount of water discharged from the water turbine and the amount of water discharged from the discharge valve).

In this way, if the discharge valve malfunctions, the iron pipe that connects the water turbine to the discharge valve may be damaged due to an abnormal increase in water pressure, or the water discharge volume to the downstream side cannot be secured. . Therefore, the ultimate goal is to eliminate malfunctions, but it is also important to reliably detect them and take appropriate measures. A conventional discharge valve control method and its detection method will be explained below with reference to FIGS. 5, 6, and 7.

Figure 5 shows the mechanism diagram of the discharge valve control device, Figure 6 shows the relationship between the guide vane opening of the water turbine and the discharge valve opening, and Figure 7 shows the guide when time is plotted on the horizontal axis. The states of the vane, the discharge valve, and the switch for detecting malfunction of the discharge valve are shown. The discharge valve is controlled in relation to the opening degree of the guide vane, as shown in FIG. 6, in accordance with the above-mentioned installation purpose. The control mechanism will be explained with reference to FIG. The discharge valve control mechanism diagram in Fig. 5 shows that the lever IA is activated from the discharge valve opening signal cam 21 (this cam realizes the relationship shown in Fig. 6) provided on the guide vane opening return axis. A state in which a discharge valve opening signal is given to the plunger of the pilot valve 22 of the secondary pressure distribution valve 15 for opening and closing the discharge valve (with the intersection of the lever 214 and the lever 7 as the fulcrum, the upward movement signal of the cam 21 is sent to the plunger 22 as a downward movement signal) (state given as). From this state, the pressure oil below the upper piston of the secondary pressure distribution valve 15 is drained through the pilot valve 22, the plunger 24 of the secondary pressure distribution valve 15 moves downward, and the oil pressure P0 from the pressure oil tank is discharged.
acts on the left side of the discharge valve servo motor 7, resulting in the discharge valve opening operation. Further, the operation of the servo motor 7 is to rotate the return shaft 8 through the return wire, and push up the lever 21 by the return signal cam 9 and the lever 7, thereby returning the pilot valve to the neutral position. There are various @ structures.

Conventionally, in this operating mechanism, a microswitch 31 for detecting an erroneous non-opening operation was installed in the position shown in FIG. This phenomenon was used to detect erroneous non-opening operations by utilizing the fact that it appeared above the plunger.

The broken line in FIG. 7 shows the switch operation when the discharge valve does not open. According to this method, the detected signal (
It is complicated to operate other solenoid valves and hydraulic equipment by the ON signal of microswitch 11 and take necessary measures, and the survival of the entire power plant must depend on the reliability of the microswitch alone. The problem was that it didn't.

[Purpose of the invention]

An object of the present invention is to provide a device that can mechanically and reliably detect false alarms and non-operations of a discharge valve, and to enable a mechanism that can mechanically provide appropriate protection based on signals from this device. .

[Summary of the invention]

A feature of the present invention is that in an opening/closing mechanism of a discharge valve that is operated in conjunction with an operation signal transmission mechanism from other equipment such as a guide vane, an erroneous and non-operation detection system is configured to compare the difference between a signal amount and an operation amount. and a guide vane gentle closing switching device operated by this detection device.

[Embodiments of the invention]

Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. 1 to 4. FIG. 1 is a mechanical diagram of the discharge valve erroneous non-operation detection device in a neutral state, and FIG. 2 is a mechanical diagram in a state where this device detects an erroneous non-opening operation. This embodiment is comprised of a part that simulates the actual operation of the servo motor (not shown) of the discharge valve, and a part that compares the simulation results with the operation of the servo motor of the discharge valve.

The simulated parts include a lever 1 that transmits the same open signal as the actual servo motor (hereinafter referred to as the main servo), and an adjustable diaphragm 2 that makes the operating time of the simulated servo motor 5 the same as that of the main servo motor. 3. It is composed of a pilot valve 4 that opens and closes the simulated servo motor 5, and a simulated servo motor 5 that simulates the operation of the main servo motor. Although it is called a simulated servo motor here, the role of this device is to simulate the normal operating state of the main servo motor at the servo motor open signal.

In addition, if there is a large difference between the operating speed of the servo motor for the guide vane and the operating speed of the main servo motor of the release valve (signal input speed is greater than the response speed), the signal amount and Direct comparison of the return signals of the main servo motors would result in a situation where the amount of deviation signals is excessive being falsely detected as non-operation, so it was necessary to install a simulated servo motor.

When the discharge valve opening signal is input, the lever 1 moves down using the connection point with the simulated servo motor 5 as a fulcrum.

Due to this downward movement, the plunger of the pilot valve 4 descends and guides the pressure oil P0 from the pressure oil tank to the lower part of the piston of the simulated servo motor 5. When the simulated servo motor 5 reaches the opening determined by the discharge valve opening signal, the plunger of the pilot valve 4 is returned to the neutral position, and the opening operation of the simulated servo motor 5 is stopped.

The part that compares the simulation results with the operation of the main servo motor of the discharge valve is a return shaft 9 that rotates according to the amount of operation of the discharge valve main servo motor, a cam 8 that converts its rotation angle into a vertical motion signal,
It is also composed of a lever 7, a simulated servo motor 5, and a switching valve 6 having a plunger moved by the lever 7. The operation of this mechanism is configured such that the amount of operation of the simulated servo motor 5 and the amount of open/stagnant ring signal from the main servo motor are compared by the plunger operation lever of the switching valve 6. The plunger of the switching valve 6 always maintains a neutral position.

As mentioned at the beginning, FIG. 5 shows a state in which this mechanism has detected an erroneous non-opening operation, and the plunger of the switching valve 6 is
Due to the upward movement of the simulated servo motor 5 (because the open/return order signal is not input from the main servo motor), it is moved upward from the neutral position, and the pressure oil P0 from the pressure oil tank is sent to the It is oiled.

FIG. 3 is a mechanical diagram showing an embodiment of the guide vane gradual closing switching mechanism. The purpose is that when the discharge valve has the same iron pipe as the water turbine, if the guide vane of the water turbine suddenly closes and the discharge valve accidentally fails to open, it will not be able to fulfill its role as a pressure suppressor, as shown by the broken line in Figure 4. As a result, the water pressure in the iron pipes increases abnormally.

(The solid line indicates the case where the discharge valve opens properly as a pressure suppressor.) In order to prevent this abnormal rise, after detecting an erroneous non-opening operation at point 0 in the figure, the 1 guide is set as shown by the dashed line. The vanes are configured to be loosely closed.

In FIG. 3, during normal operation, the 658 side of the solenoid valve 11 for stopping water turbine operation is energized, and the pressure oil P0 from the pressure oil tank is acting on the upper boat of the hydraulic switching valve 12, so the switching valve 12 is Press the lower spring and as shown in the upper block of the figure, control pressure oil from ■ to the guide pan support motor 17.
Oil is passed to the lower side of the upper piston 16 of the secondary pressure distribution valve 15, and the servo motor 17 is operated by the control pressure oil from (2). Since the sudden stop command of the water turbine energizes the 65T side of the solenoid valve, the state shown in the figure occurs, and the upper pressure oil of the switching valve 12 passes through the block on the 65T side and is drained, and the upper piston of the secondary pressure distribution valve 15 The pressure oil that was acting on the lower side of 16 is
The oil is drained through 2.

Therefore, the upper piston 16 descends to a position determined by the closing speed limiting mechanism 14 of the guide vane servo motor 17 to provide a predetermined oil passage area to the oil passage and drainage boat 8.8 of the secondary pressure regulating valve. Here, if an erroneous unopening operation is detected by the detector of the present invention at point 0 in Fig. 4, the pressure oil will flow to the ■ system in Fig. 2 (■ in Fig. 3 indicates the same system). Pressure oil acts on the lower chamber of the piston/cylinder 3 and pulls up the plunger of the secondary pressure distribution valve, reducing the area of the oil passage port of the oil passage boat 18.18A, and as a result, the operating time of the servo motor is reduced. As a result, the mode shown by the single-dot chain and gland in FIG. 4 is achieved. In addition, 13 in the figure
is a hydraulic piston cylinder, and 23 is a servo motor closing speed limiting mechanism.

〔Effect of the invention〕

According to the present invention, it is possible to mechanically detect an erroneous non-opening operation of the discharge valve, and furthermore, in combination with another hydraulic device, it is possible to reliably take appropriate measures, thereby greatly increasing the reliability of the discharge valve control mechanism. It can be greatly improved.

[Brief explanation of drawings]

Fig. 1 is a mechanism diagram of an erroneous non-opening operation detector according to an embodiment of the present invention, Fig. 2 is a mechanism diagram showing the detection time of Fig. 1, Fig. 3 is a diagram of the guide vane servo motor operation mechanism, and Fig. The figure is a time chart of the present invention, Figure 5 is a conventional discharge valve control mechanism diagram, and Figure 6 is a diagram of the conventional discharge valve control mechanism.
The figure shows the control relationship between guide vane opening and discharge valve opening.
FIG. 7 is an operation time chart. 1...Discharge valve opening/closing signal transmission lever, 2.3...Simulated servo motor opening/closing speed adjustment throttle, 4...Simulated servo motor opening/closing pilot valve, 5...Simulated servo motor, 6...Comparison switching valve, 7...Main servo motor return signal lever, 8...Main servo motor return signal cam, 9
...Main servo motor return signal axis. 1st prisoner Z mouth 40th time same funeral 5th ward 1-mu C? ) branch 31 level of drunkenness

Claims (1)

[Claims] 1. In a hydraulic machine having a discharge valve, a device for simulating the operation of the discharge valve based on an opening signal of the discharge valve, a return signal for a servo motor for the discharge valve, and the simulation device. What is claimed is: 1. A guide vane control device comprising a device for comparing operations of the discharge valve, mechanically detecting erroneous non-operation of the discharge valve and switching the closing speed of the guide vane to a slow closing mode. 2. In claim 1, a hydraulic switching valve is used as the comparison device, and other hydraulic equipment of the hydraulic machine is forcibly operated to gently close the guide vane when the discharge valve is not opened. A guide vane control device featuring: