JPH0716046Y2 - Guide vane closing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Field of Industrial Application) The present invention relates to a guide vane closing device in a hydraulic machine.

(Prior Art) Generally, in a hydroelectric power plant, the flow rate to the turbine is controlled by controlling the opening of the guide vane of each turbine, and the rotation speed is controlled. That is, in the speed control of the water turbine, the guide vane is rotated by the guide vane servomotor about the turbine main shaft,
The rotation of the guide baling opens and closes each guide vane interlocked with the guide baling.

By the way, as for the drive method of the guide vane servomotor, more and more machines are using electric ones instead of hydraulic ones. The electric part of the electric servomotor type speed control device based on electricity is generally composed of a control part, a driver part (motor control part, drive part), and a motor part. The control unit gives an opening command to the driver unit by inputting inputs such as the rotation speed and rotation speed command of the water turbine, the servo motor opening and the servo motor opening command, and the driver unit receives the command from the control unit and the motor. Drive current is supplied to the motor by inputting the rotation angle and angular velocity, the motor current, and so on. Further, the motor unit rotates in a rotation direction and a speed according to a drive current from the driver unit, and drives the guide vane servomotor via the mechanical mechanism unit.

(Problems to be solved by the invention) However, when a failure occurs in the above control device, it is necessary to close the guide vane to stop the water turbine. The guide vane can be closed by giving a signal directly to the motor part to drive the motor part, but when the driver part or the motor part fails, the guide vane servomotor cannot be moved and the guide vane must be closed. There is a problem that it becomes impossible.

In view of the above points, the present invention is a guide vane closing device that can directly use the rotational force of a water turbine to close the guide vanes when the driver or motor of the guide vane servomotor fails. Aim to get.

[Constitution of device]

(Means for Solving the Problem) The present invention extracts the rotational force of a main shaft in a guide vane closing device in a hydraulic machine in which a guide vane servomotor rotates a guide vane ring to open and close each guide vane. A rotational force take-out device and a clutch that is activated when the guide vane servomotor fails and outputs the rotational force from the rotational force take-out device, and the rotational force output via the clutch is transmitted via a torque switch and a reduction mechanism. And a guide vane drive mechanism that is transmitted to the guide vane ring.

(Operation) If the guide vane servomotor fails for some reason during operation of the hydraulic machine, the clutch operates and the rotational force directly taken out from the main shaft is transmitted to the guide vane drive mechanism via the clutch, and the guide vane ring Is actuated in the closing direction, each guide vane is driven in the closing direction, and the guide vanes are closed.

(Embodiment) An embodiment of the present invention will be described below with reference to the accompanying drawings.

In FIG. 1, reference numeral 1 denotes a guide vane servomotor, and a movable rod of the guide vane servomotor 1
The tip of 1a is connected to the guide vane 2. Then, when the guide vane servomotor 1 is operated and the movable rod 1a expands and contracts, the guide baling 2 is rotated, and the guide balings 2 are respectively connected to the guide balings 2 via links or the like (not shown). The vanes are controlled to open and close.

The above-mentioned device is exactly the same as the conventional device, but in the present invention, the drive gear 4 is concentrically mounted on the water turbine main shaft 3. A driven gear 5 is meshed with the drive gear 4 as shown in FIG. 2, and a shaft 6 of the driven gear 5 is provided with an electromagnetic clutch 7 and a torque switch 8. The output shaft of the torque switch 8 is connected to a pinion 10 via a reduction gear mechanism 9, and the pinion 10 is meshed with teeth formed on the outer periphery of the guide vane ring 2. In FIG. 2, reference numeral 11 is a casing, and 12 is a guide vane.

If the driver or motor of the guide vane servomotor 1 fails for some reason, the electromagnetic clutch 7 is activated. Therefore, the rotational force of the driven gear 5 that is constantly rotated by the drive gear 4 is transmitted to the torque switch 8 via the electromagnetic clutch 7. The torque switch 8 transmits a rotational force to the reduction gear mechanism 9 when the torque is equal to or less than a certain torque in order to protect the abnormal torque and mechanical protection when the guide vanes are fully closed. The torque switch 8 has a rotation speed determined by the gear ratio of the reduction gear mechanism 9. The pinion 10 is driven. Then, the guide vane ring 2 is rotated by the rotation of the pinion 10, and the guide vane ring 2 operates each guide vane 12 in the fully closing direction.
When the guide vanes 12 are fully closed, the amount of water flowing into the water turbine disappears and the water turbine is controlled to stop. When the guide vanes 12 are fully closed in this way, the fully closed state is locked by a lock mechanism (not shown).

By the way, the electromagnetic clutch 7 operates intermittently when the rotational speed of the water turbine is high, and is continuously operated when the rotational speed is low. Further, the guide vane 12 operates intermittently near the fully closed state to cause mechanical shock when the guide vane is fully closed. Is actuated to mitigate.

In this way, when the guide vane servomotor fails, the guide vanes are automatically fully closed by the rotational force of the water turbine itself, and the occurrence of abnormalities in the water turbine is prevented.

In addition, in the above-mentioned embodiment, the turbine has been described, but it goes without saying that it can be applied to a pump.

[Effect of device]

As described above, the present invention is operated when the rotational force take-out device of the main shaft such as the driving gear and the driven gear provided on the main shaft and the guide vane servomotor are activated, and output the rotational force from the rotational force take-out device. Since a clutch and a guide vane drive mechanism such as a pinion that transmits its rotational force to the guide vane ring are provided, the guide vane can be driven by the rotational force of the hydraulic machine itself without requiring a power source when the guide vane servomotor fails. It can be securely closed. Therefore, it is possible to prevent an abnormal situation of the hydraulic machine from occurring, and it is possible to further improve the safety.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a plan view of a guide vane closing device of the present invention, and FIG.
The figure is a side view of the same. 1 ... Guide vane servo motor, 2 ... Guide vane ring, 3 ... Water turbine main shaft, 4 ... Drive gear, 5 ... Driven gear, 7 ... Electromagnetic clutch, 9 ... Reduction gear mechanism, 10 ...
… Pinion, 12… Guide vanes.

Claims (1)

[Scope of utility model registration request] 1. A guide vane closing device in a hydraulic machine in which a guide vane ring is rotated by a guide vane servomotor to open and close each guide vane, and a rotational force take-out device for taking out a rotational force of a main shaft and the guide. A clutch that is activated when the vane servomotor fails and outputs the rotational force from the rotational force extracting device, and the rotational force output through the clutch is transmitted to the guide vane ring through a torque switch and a reduction mechanism. A guide vane closing device comprising: a guide vane drive mechanism.