JPS60206977A - Adjusting device for guide vane - Google Patents

Abstract

PURPOSE:To make a wide variety of closing energy usable as well as to make a guide vane closable at all times, by installing a motor driving part for an operating arm, a cutoff part severing the driving force and a hydraulic cylinder connected to the operating arm. CONSTITUTION:Rotative motion of a motor 16 is decelerated at each of gears 17a and 17b and converted into rectilinear motion by a screw stock 18. At this time, even if compressive force of a spring 21 works, a link 11 is stable enough whereby an operating arm 10 goes down with drive of the said motor 16, and a guide vane is operated for its opening or closing. On the other hand, in the case where anything trouble occurs in a motor driving part due to the motor 16 or the like and thereby a hydraulic turbine is suddenly stopped, a solenoid valve 23 is selected by pressure of a hydraulic power source P, pushing up a piston of a cylinder 22, and moment is given to a frame 15. With this constitution, the link 11 is bent to some extent, then the operating arm 10 is made to go down (A), and the guide vane is closed. In addition, a throttle valve 28 is operated, and a closing speed of the guide vane is restricted by a hydraulic cylinder 24.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to an improvement in a guide vane adjustment device that performs holo adjustment to a water turbine by controlling the opening and closing of the guide vanes.

[Technical background of the invention]

For example, a water turbine for hydroelectric power generation is equipped with an adjustment device that adjusts the amount of water supplied to the water turbine by controlling the opening and closing of guide vanes, and closes the guide vanes in order to stop the water turbine in the event of an accident or the like. As such an adjustment device, there is one in which electric power is converted into motion using screws, gears, etc. to drive an operating arm connected to a kite vane.

An example of a conventional configuration of this type of adjustment device will be described below with reference to FIG. That is, reference numeral 1 designates an operating arm having one end connected to a not-shown guide vane and the other end connected to one end of a rotary joint 2 by a pin.

3 is a threaded rod with one end fixed to the other end of the rotary joint 2, and this threaded rod 3 has an axial spline 3a on one end side.
is formed, and a screw 3b is formed on the other end side. A gear 4a is attached to the spline 3a of this threaded rod 3,
This gear 4a is a gear 4b fitted to the shaft 5a of the electric gear 5.
Driven by. Further, a threaded piston 6 is attached to the threaded portion 3b of the threaded rod 3, which together with the threaded portion 3b constitutes a screw. And this piston 6
is provided in a cylinder 7, and fluid pressure from a fluid source P is applied to the cylinder 7 via a solenoid valve 8. Note that 9 is a spline rod for preventing rotation of the piston 6.

Next, the operation of the conventional guide vane adjusting device having the above configuration will be explained. First, the operation using the electric motor 5 will be explained. That is, in the initial state, the piston 6 is pressed against the left side of the cylinder 7 in the drawing. In this state electric 15
When driven, the threaded rod 3 rotates via the gears 4b and 4a. As a result, the piston 6 is fixed, so
A threaded portion 3b of the threaded rod 3 advances to the right side of the cylinder 7 and drives the operating arm 1 via the rotary joint 2 to open and close a guide vane (not shown).

Next, the operation using fluid pressure will be explained. That is, when the solenoid valve 8 is switched from the block 8C to the block 8a with the piston 6 being pressed against the left side of the cylinder 7 in the initial state, both the piston 6 and the threaded rod 3 are moved by the fluid pressure from the fluid source P. Move it to the right side in the figure to quickly close the guide vane.

From this state, electric t! 5, switch the solenoid valve 8 to the block 8b, then drive the electric cap 5 in the closing direction to move the piston 6 to the left, and when the piston 6 reaches the left end, the solenoid valve 8 is switched to block 8C, and the electric axle 5 is driven in the same manner as described above.

[Problems with background technology]

In this type of guide vane adjustment device, if it becomes inoperable due to a failure, power cut off of the electric motor 5, etc., or if runaway occurs, it is necessary to suddenly close the guide vane to safely stop the water turbine. be.

However, the conventional guide vane adjustment device described above has a problem in that if the thread of the threaded rod 3 is damaged and the threaded relationship with the piston 6 is impaired, the guide vane cannot be closed. Further, the only energy source for closing the guide vane is fluid pressure, which has the disadvantage of lacking in versatility.

[Purpose of the invention]

The present invention has been made based on the above circumstances, and its purpose is to be able to use various types of closing energy and to maintain the guide vane even in the event of electrical or mechanical failure or damage. An object of the present invention is to provide a guide vane adjustment device that can be closed.

[Summary of the invention]

A guide vane adjustment device according to the present invention includes an electric drive unit that drives an operating arm, a cutoff unit that disconnects the driving force of the electric drive unit, and a fluid pressure cylinder connected to the operation arm, The present invention is characterized in that when the vane is closed, the shutoff section is operated and the closing speed of the guide vane is limited by the fluid pressure cylinder by a closing force applied to the guide vane.

[Embodiments of the invention]

The guide vane adjusting device according to the present invention will be explained below according to an embodiment shown in FIG.

That is, in FIG. 2, reference numeral 10 denotes an operating arm having one end connected to a not-shown guide vane and the other end rotatably connected to one end of a link 11 by a pin 10a. The other end of this link 11 is connected to an operating rod 14 of an electric operation unit rotatably supported by a bin 13 on a base 12.
They are rotatably connected by 0b. In the electric operation unit, an electric motor 16 is attached to a frame 15, a gear 17a1 driven by the electric motor 16, and a gear 17b corresponding to the gear 17a are arranged in the frame 15, and the gear 17b is fitted to operate the electric operation unit. A threaded rod 18 is disposed on the other end of the rod 14 as a screw, and a sliding tube 19 on which the operating rod 14 slides is fixed to the frame 15 to form the entire structure.

In the above, the links 1, 1 include a stopper arm 11
a is formed, and this stopper arm 11a comes into contact with the operating rod 14, so that the centers of the bins 10a, 10b, and 13 are on the same straight line, that is, the link 11 and the operating rod 14 are prevented from bending. There is.

A limit switch 20 is provided at the end of the stopper arm 11a and detects contact of the stopper arm 11a with the operating rod 14. A spring 21 is disposed between the base 12 and the frame 15 and applies a load to the link 11 and the operating rod 14 in the six directions shown by solid lines in the figure. 22 is the bin 1 between the base 12 and the frame 15.
3 between the link 11 and the operating rod 1.
The trip cylinder 22 is a trip cylinder that applies a moment in the direction of the broken line B shown in FIG. A hydraulic cylinder 24 is rotatably supported on the base 12 by a pin 25, and the end of a piston rod 26 of the hydraulic cylinder 24 is rotatably connected to an intermediate portion of the operating arm 10 by a pin 27. ing. 28 is a throttle valve provided in the fluid pressure cylinder 24, 29 is a check valve similarly provided in the fluid pressure cylinder 24,
These control the speed of the piston rod 26.

Next, the operation of this embodiment configured as described above will be explained. That is, the rotational movement of the electric motor 16 is caused by the gears 17a, 1
7b, and is converted into linear motion by the threaded rod 18. Here, since the bottle 10b is positioned approximately on the operating force line by the stopper arm 11a and the spring 21, the link 11 is stable even if compressive force is applied by the spring 21, and the link 11 is stable as the electric aphrodisiac 16 is driven. The operating arm 10 is then lowered, and the guide vanes are therefore opened and closed.

Here, a case will be described in which an electrical or mechanical abnormality occurs in the electric drive unit such as the electric motor 16 and the water turbine is suddenly stopped. That is, the solenoid valve 23 is switched and the piston of the tripping cylinder 22 is pushed up by the pressure of the fluid source P, thereby applying a tripping moment to the frame 15. At the same time, a closing force due to a hydraulic moment of a guide vane (not shown), a weight, fluid pressure, etc. is applied to the electric drive unit to bend the link 11 and move the operating arm 10 in the six directions shown by solid lines as shown in FIG. to close the guide vane. At this time, the throttle valve 28 is operated, and the closing speed of the guide vane is limited by the fluid pressure cylinder 24 so that the water turbine waterway i is not destroyed due to the sudden closing of the guide vane.

After the link 11 is returned from the bent state due to the guide vane closure to the state shown in FIG. 3, the solenoid valve 23 is switched to the electrically operated state and the electric motor 16 is driven until the guide vane is fully closed. As a result, when the limiter 1 to the switch 20 are operated, the operation is shifted to the opening/closing operation of the guide vane by the electric motor 16.

As described above, according to this embodiment, the following effects can be obtained.

■According to this embodiment, the electric drive unit is cut off and the guide vane is closed by the tripping cylinder 22 as another closing means, so even if any failure occurs in the electric operation unit, the guide vane will be closed. can do.

■According to this practical example, in order to close the guide vane when an electric drive unit is not used, it is sufficient to apply closing energy separately, so a wide range of forces such as hydraulic force, gravity, spring force, fluid pressure, etc. that act on the guide vane can be applied. energy can be used.

■According to this embodiment, the fluid pressure cylinder 24 can be operated even during electric operation, and the piston rod 2
Since the resistance near the stroke end of 6 can be increased to provide a buffering effect, the threaded rod 18 will not be damaged by the impact of hitting the stopper arm 11a in the event of runaway.
It can prevent it from digging in.

〔Effect of the invention〕

As described above, according to the present invention, the electric drive section that drives the operation arm, the cutoff section that disconnects the driving force of the electric drive section, and the fluid pressure cylinder connected to the operation arm are connected to the When the guide vane is closed, the blocking portion is operated and the closing speed of the guide vane is limited by the fluid pressure cylinder by the closing force applied to the guide vane, so that various types of closing energy can be used. In addition, it is possible to provide a guide vane adjustment device that can close the guide vane even in the event of electrical or mechanical failure or damage.

[Brief explanation of drawings]

Figure 1 is a configuration diagram showing a conventional guide vane adjustment device;
FIG. 2 is a block diagram showing one embodiment of the guide vane adjusting device according to the present invention, and FIG. 3 is a diagram for explaining the operation of the same embodiment. 10--operation arm, 10a, 10b, 13, 25.
27... Bin, 11... Link, 11a... Stopper arm, 12... Base, 14... Operating rod, 15... Frame, 16... Electric motor, 17a
, 17b... Gear, 18... Threaded rod, 19... Sliding tube, 20... Limit switch, 21... Spring, 22... Tripping cylinder, 23... Solenoid valve, 24... Fluid pressure cylinder, 26... Piston rod, 28... Throttle valve, 29... Check valve. Applicant's agent Patent attorney Takehiko Suzue Figure 1

Claims (1)

[Claims] An electric drive unit that is connected to the operation arm that opens and closes the guide vane of the water turbine and drives the operation arm, a cutoff unit that disconnects the driving force of the electric drive unit, and a cutoff unit that is connected to the operation arm and that operates when the guide vane is closed. A guide vane adjusting device comprising: a fluid pressure cylinder that limits the closing speed of the guide vane by a closing force applied to the guide vane when the blocking portion operates.