JPS6214380Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device in which an actuator that converts rotational motion by an electric motor into linear motion operates even during a power outage.

As a means of efficiently rotating a power generation water turbine or controlling the amount of power generation by increasing or decreasing the amount of water,
It is common practice to change the amount of opening and closing of a guide vane so as to adjust the amount of water supplied to a water turbine for power generation. Normally, such guide vanes are opened and closed by the reciprocating linear movement of a feed nut that is threaded onto a feed screw connected to the rotating shaft of the electric motor via a reducer and is prevented from rotating. The opening/closing amount is adjusted by the forward/reverse operation and the amount of rotation.

By the way, in the event of a power outage, the electric motor stops and the opening/closing control of the guide vanes becomes impossible, so it is preferable to close the guide vanes of the power generation water turbine and also stop the generator. However, with conventional systems, the opening and closing positions of the guide vanes are mechanically preserved during a power outage, so it is completely impossible to arbitrarily change the power generation amount or stop the generator during a power outage. However, it was unreasonable in terms of safety, etc.

Therefore, a system has been developed that aims to improve reliability by controlling the opening and closing of the guide vane even during a power outage.In this case, the hydraulic cylinder is directly connected to the guide vane separately from the electric motor, and the hydraulic cylinder is connected directly to the guide vane in the event of a power outage. It operates a hydraulic cylinder. In this case, all the water pressure that is applied to the guide vane is received by the hydraulic cylinder, so
This requires at least the same size as the actuator, which makes it impossible to miniaturize the entire device, and has the disadvantage that it has a complicated structure and is expensive.

In view of the shortcomings of conventional devices in opening and closing the guide vanes of power generation water turbines, it is an object of the present invention to provide a small-sized emergency operation device that can automatically close the guide vanes in the event of a power outage.

The structure of the actuator emergency operating device of the present invention that achieves this purpose is to connect one end of the rotating shaft of an electric motor to the actuator that converts rotational motion into linear motion, and to connect the other end of the rotating shaft of the electric motor to an actuator that converts rotational motion into linear motion. If the air supply path is connected to the pneumatic motor and the compressed air storage tank that supplies compressed air to the pneumatic motor and the pneumatic motor is turned off, this air supply path is connected to the pneumatic motor. It is characterized by being equipped with a solenoid valve that opens.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, one embodiment of the actuator emergency operation device according to the present invention applied to guide vane operation of a power generation water turbine will be described in detail with reference to drawings showing the principle thereof. A feed nut portion 12 connected to a guide vane of a power generation water turbine (not shown) and slidably engaged with a guide frame 11 has a guide groove 14 that engages with a guide protrusion 13 protruding from the guide frame 11. is engraved, and the feed nut portion 12 can reciprocate along this guide protrusion 13. The electric motor 1 via a large number of reduction gears 15
A feed screw shaft portion 17 connected to the rotating shaft 6 is rotatably supported by a bearing 19 attached to a support base 18, and is screwed into the feed nut portion 12. Therefore, in the actuator composed of the feed screw shaft 17 and the feed nut 12, the rotation of the feed screw shaft 17 causes the feed nut 12 to move linearly, opening and closing the guide vane (not shown). There is. In addition, the electric motor 16 and the reduction gear 1
A torque limiter 20 that prevents transmission of excessive torque from the actuator side is interposed between the torque limiter 20 and the actuator 5. A compressed air storage tank 23 storing compressed air is connected to the pressure motor 22 via an air supply path 24 . The air supply path 24 includes a solenoid valve 26 equipped with a silencer 25 that supplies air in the compressed air storage tank 23 to the pneumatic motor 22 during a power outage, and two pressure reducing valves located on both sides of the solenoid valve 26. Valves 27 are respectively assembled, and a check valve 28 with a variable throttle is connected to the pneumatic motor 22 together with a muffler 29.

Therefore, when the electric motor 16 stops operating due to a power outage, the solenoid valve 26 opens and the compressed air storage tank 23 is opened.
As long as the manual valve 30 is open, the compressed air in the compressed air storage tank 23 flows into the pneumatic motor 22 and forcibly turns the rotating shaft of the electric motor 16 in one direction, so the feed screw shaft 17 rotates. feed nut part 1
2 is moved, the guide vane automatically closes, and the operation of the generator (not shown) is stopped. In this case, since the movement of the feed nut portion 12 is stopped by a stopper (not shown) when the guide vane is fully closed, the feed screw shaft portion 17
The guide vanes stop under torque, and the guide vanes do not open easily due to the water pressure applied to the guide vanes.

As described above, according to the actuator emergency operation device of the present invention, the actuator is operated in the event of a power outage using a pneumatic motor that is directly connected to the electric motor, so it is possible to downsize the entire device without major modification, and it is possible to operate the actuator in the event of a power outage. It may also be possible to plan to improve reliability over time.

[Brief explanation of drawings]

The drawing is a mechanical principle diagram showing the concept of an embodiment in which the actuator emergency operation device according to the present invention is incorporated into the guide vane opening/closing mechanism of a power generation water turbine. , 17 is a feed screw shaft, 22 is a pneumatic motor, 23 is a compressed air storage tank, 24 is an air supply path, and 26 is a solenoid valve.

Claims (1)

[Scope of utility model registration request] One end of the rotating shaft of the electric motor is connected to an actuator that converts rotational motion into linear motion, and the other end of the rotating shaft of the electric motor is connected to a pneumatic motor,
A solenoid valve is installed in the air supply path between the compressed air storage tank that supplies compressed air to the pneumatic motor and the pneumatic motor, which opens the air supply path when the electric motor is powered off. An emergency operating device for an actuator, characterized by: