JPH0121351B2 - - Google Patents

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 adjusts the amount of water 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 the power of an electric motor is converted into motion using screws, gears, etc. to drive an operating arm connected to a guide vane.

Below, an example of the conventional configuration of this type of adjustment device will be explained in the first section.
This will be explained with reference to the figures. 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 a rotating joint;
This threaded rod 3 has an axial spline 3a formed at one end thereof, and a thread 3b formed at the other end. The spline 3a of this threaded rod 3 has a gear 4.
a is attached, and this gear 4a is connected to the shaft 5 of the electric motor 5.
It is driven by a gear 4b fitted into the gear 4b. 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. The piston 6 is provided within 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. When the electric motor 5 is driven in this state, the threaded rod 3 rotates via the gears 4b and 4a. As a result, since the piston 6 is fixed, the 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 the 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, the piston 6 and the threaded rod 3 are both 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.

To return to operation using the electric motor 5 from this state,
After switching the solenoid valve 8 to the block 8b, the electric motor 5 is driven 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 closed.
is switched to block 8c, and the electric motor 5 is driven in the same manner as described above.

[Problems with background technology]

With 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, the guide vane must be suddenly closed to safely stop the water turbine. be. However, the conventional guide vane adjusting 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. Furthermore, the only energy source for closing the guide vanes 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-mentioned 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]

The guide vane adjusting device according to the present invention has a piston and
The speed can be adjusted by operating a check valve and a throttle valve, and the base of the cylinder is in the first position relative to the base.
a cylinder mechanism provided to be tiltable via a second pin; a screw mechanism; and an electric motor for operating the screw mechanism; and the base of the screw mechanism is tiltable relative to the base via a second pin. an electric drive unit provided in the screw mechanism; the electric drive unit is provided so as to be tiltable with respect to the operating end of the screw mechanism via a third pin;
and a link having a stopper arm that can be formed in line with the electric drive part;
A guide vane of a water turbine is operated to open and close, and its end is tiltable relative to the link via a fourth pin, and its intermediate portion is relative to the end of the piston rod of the cylinder mechanism. An operating arm that is tiltable via a fifth pin is disposed between the base and the base of the screw mechanism of the electric drive unit, and the link is in a straight line with the electric drive unit. a spring for holding the link, and a tripping cylinder provided on the base and configured to release the link and the electric drive unit from a straight line state by pushing up a base portion of the screw mechanism of the electric drive unit. be.

[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 the link 11 is rotatably connected by a pin 10b to an operating rod 14 of an electric operating section which is rotatably supported by a pin 13 on the base 12. The electric operation unit has an electric motor 16 attached to a frame 15, and a gear 17 driven by the electric motor 16 inside the frame 15.
a, a gear 17b corresponding to the gear 17a is disposed, and a threaded rod 18 is disposed to which the gear 17b is fitted and screwed into the other end of the operating rod 14 as a screw;
The entire structure includes a sliding tube 19 on which the slide tube 19 is fixed. Gear 17a, gear 17b, base 15
The frame 15 having the shape a, the operating rod 14, the threaded rod 18, and the sliding tube 19 constitute a screw mechanism.

In the above, the link 11 is formed with a stopper arm 11a, and this stopper arm 11
When a comes into contact with the operating rod 14, the pin 10
The centers of a, 10b, and 13 are on the same straight line, that is, the link 11 and the operating rod 14 are prevented from bending.

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. 21
is arranged between the base 12 and the frame 15,
Illustrated solid line A between the link 11 and the operating rod 14
It is a spring that applies a load in one direction. 22 is arranged between the base 12 and the frame 15 with the pin 13 in between, and is connected to the link 11 and the operating rod 14.
The tripping cylinder 22 is a tripping cylinder that applies a moment in the direction of the broken line B shown in the figure, and this tripping cylinder 22 is supplied with fluid pressure from a fluid source P via a solenoid valve 23. A hydraulic cylinder 24 is rotatably supported on the base 12 by a pin 25, and the end of the piston rod 26 of the hydraulic cylinder 24 is rotatably connected to the intermediate portion of the operating arm 10 by a pin 27. There is. 28 is a throttle valve provided on the fluid pressure cylinder 24, and 29 is a check valve similarly provided on the fluid pressure cylinder 24, which control the speed of the piston rod 26. Hydraulic cylinder 24 with base 26a, piston rod 26, throttle valve 2
8. The check valve 29 constitutes a cylinder mechanism.

Next, the operation of this embodiment configured as described above will be explained. That is, the rotational movement of the electric motor 16 is
The speed is reduced by gears 17a and 17b, and converted into linear motion by a threaded rod 18. Here, since the pin 10b is positioned substantially on the operating force line by the stopper arm 11a and the spring 21, the link 11 is stable even when compressive force is applied by the spring 21, and as the electric motor 16 is driven The operating arm 10 is then lowered, and the guide vanes are 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 as shown in FIG. 3 and move the operating arm 10 in the direction of the solid line A shown in the drawing. Lower it to close the guide vane. At this time, the throttle valve 28 is operated to limit the closing speed of the guide vane by the fluid pressure cylinder 24 so that the water turbine waterway is not destroyed due to sudden closure of the guide vane.

and link 11 by closing the guide vane.
After returning from the bent state to the state shown in FIG.
When the motor 16 operates, the guide vane is opened and closed 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.
The guide vane can be closed even if any failure occurs in the electric operating part.

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

According to this embodiment, the fluid pressure cylinder 24 can be operated even during electric operation,
Since the resistance near the stroke end of the piston rod 26 can be increased to provide a buffering effect, the threaded rod 18 is prevented from being damaged or dug in by the impact of hitting the stopper arm 11a in the event of runaway movement. It can be prevented.

[Effects of the Invention] As described above, according to the present invention, an electric drive section that drives an operating arm, a cutoff section that disconnects the driving force of the electric drive section, and a fluid pressure cylinder connected to the operation arm are provided. When the guide vane is closed, the shutoff section 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. A guide vane adjusting device can be provided which can be used and which can close the guide vane even in the event of electrical or mechanical failure or damage.

[Brief explanation of drawings]

Fig. 1 is a block diagram showing a conventional guide vane adjusting device, Fig. 2 is a block diagram showing an embodiment of the guide vane adjusting device according to the present invention, and Fig. 3 explains the operation of the same embodiment. This is a diagram for 10...operation arm, 10a, 10b, 13,
25, 27...pin, 11...link, 11a...
...Stopper arm, 12...Base, 14...
Operation rod, 15...Frame, 16...Electric motor, 17a, 17b...Gear, 18...Threaded rod,
19...Sliding pipe, 20...Limit switch, 2
1...Spring, 22...Tripping cylinder,
23...Solenoid valve, 24...Fluid pressure cylinder, 2
6... Piston rod, 28... Throttle valve, 29...
...Chetsuki dialect.

Claims (1)

[Claims] 1 The speed can be adjusted by operating a piston, check valve, and throttle valve by flowing fluid into the cylinder, and the base of the cylinder is provided so as to be tiltable with respect to the base via a first pin. an electric drive unit having a cylinder mechanism, a screw mechanism, and an electric motor for operating the screw mechanism, and in which a base portion of the screw mechanism is provided so as to be tiltable with respect to the base via a second pin; a link having a stopper arm that is tiltable relative to the operating end of the screw mechanism of the electric drive unit via a third pin and that can be formed in a straight line with the electric drive unit; A device that opens and closes a guide vane of a water turbine, the end of which is connected to the fourth link.
an operating arm that is tiltable via a fifth pin, and whose intermediate portion is tiltable relative to the end of the piston rod of the cylinder mechanism via a fifth pin; a spring disposed between the base of the screw mechanism of the drive section and maintaining the link and the electric drive section in a straight line; and a spring disposed on the base to maintain the base of the screw mechanism of the electric drive section. A guide vane adjusting device comprising: a tripping cylinder that releases the link and the electric drive unit from being in a straight line when pushed up.