JPH0774633B2 - Guide vane switchgear for hydraulic machines - Google Patents

Description

The present invention relates to a guide vane opening / closing device for a hydraulic machine, and particularly to a guide vane of a predetermined size when an abnormality occurs in opening / closing of the guide vane. The present invention relates to a guide vane opening / closing device for a hydraulic machine in which the driving torque is not applied.

(Prior Art) Generally, in a hydraulic machine such as a turbine or a pump turbine, the flow rate is adjusted by opening and closing a movable guide vane at a predetermined opening according to an output or a pumping amount requested from a system. This movable guide vane is designed to be opened and closed by a drive device such as a servo motor.However, if foreign matter or the like is caught between the adjacent guide vanes during the closing operation of the guide vanes, the guide vanes will malfunction. Loads may act on the guide vanes and damage them.

Therefore, in order to prevent the guide vane from being damaged, the spindle of the guide vane and one end of the guide vane arm are connected by a key, and the other end of the guide vane arm and the guide ring are connected by a link and a pin. There is known a structure in which a so-called weak point pin is inserted between the tip portion and the link, and the weak point pin is cut off to protect the guide vane from damage when the abnormal load is applied.

In addition, a torque transmission member is inserted between the spindle of the guide vane and the guide vane arm, and when the above-mentioned abnormal load is applied, the drive torque of the guide vane becomes a predetermined torque or more and slips on the torque transmission member. A structure is known in which a condition occurs and damage to the guide vanes is protected (for example, Japanese Utility Model Publication No. 53-72034 and Japanese Utility Model Publication No. 54-11153).
(See the official gazette).

(Problems to be Solved by the Invention) However, in the above-described conventional structure, when a guide vane is closed, a foreign matter or the like is caught between the guide vanes, and a slip state occurs in the torque transmission member when an abnormal load acts, and This is effective in avoiding abnormal load on the vane. However, when the guide vanes are violently oscillated due to the imbalance of the hydraulic moment due to running water under the unrestrained condition, the adjacent guide vanes will be repeatedly hit, which will seriously affect the hydraulic machine. Not preferable. Therefore, it has been conventionally performed to provide a stopper that regulates the swing angle of the guide vane. However, the guide vane arm or the like has a complicated shape due to the provision of the stopper, and the stopper has to be strong and large in order to stop the guide vane that swings vigorously. The configuration is complicated and large.

Therefore, an object of the present invention is to eliminate the problems of the above-described conventional technology, and to accurately regulate the swing angle of the guide vane when the phenomenon of the guide vane swinging independently occurs. An object of the present invention is to provide a guide vane opening / closing device for a hydraulic machine that has a simple structure and is compact.

[Structure of Invention]

(Means for Solving the Problems) In order to achieve the above object, a guide vane opening / closing device of a hydraulic machine according to the present invention is provided with an arm boss fixed to a spindle of the guide vane and between the arm boss and the guide vane arm. A wear torque transmitting member that is attached and is capable of transmitting a rotational torque up to a predetermined size, a pair of projections that are provided on the side surface of the arm boss at a predetermined interval in the circumferential direction, and the side of the guide vane arm. And a stopper located between the pair of protrusions.

(Operation) When rocking torque of a predetermined value or more is applied to the guide vane by the action of running water, the wear torque transmitting member slips and the guide vane swings independently, but it is projected on the side surface of the arm boss. Since the pair of projections and the stopper provided on the guide vane arm are in contact with each other, the swing angle of the guide vane can be regulated.

At this time, the rocking energy of the guide vanes is attenuated by the wear torque transmitting member, so that the protrusion and the stopper do not collide violently. Accordingly, since the projection and the stopper do not have to be large and strong, the opening / closing device of the guide vane can be made compact.

Further, since the guide vane arm is connected to the arm boss via the wear torque transmitting member having high assembly accuracy, the accuracy of the relative angle between the arm boss and the guide vane arm is extremely high. Accordingly, by directly contacting the protrusion with the stopper, the relative angle of the guide vane arm with respect to the arm boss can be accurately determined. Therefore, by contacting the pair of protrusions projecting on the arm boss with the stopper projecting on the guide vane arm, the swinging angle when the guide vane independently swings can be accurately regulated.

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

1 and 2, reference numeral 1 indicates a guide vane, and a spindle 2 is integrally attached to the guide vane 1. The guide vane 1 is provided between the upper cover 3 and a lower cover (not shown). The spindle 2 has a bush 4 provided on the upper cover 3.
And protrudes above the upper cover 3. An arm boss 5 is fitted on the upper portion of the spindle 2, and a collar portion 6 is formed on the lower portion of the arm boss 5. Further, the upper portion of the collar portion 6 is rotatably supported by the divided thrust receiving members 7, 7 so as not to move in the axial direction. The thrust receiving member 7 is fixed to the upper cover 3 with bolts 8. A spindle key 9 is fixed to the boundary between the arm boss 5 and the spindle 2.

On the other hand, a threaded portion 10 is integrally formed on the end surface 2a of the spindle 2, and a cover 11 is provided at the upper end of the arm boss 5 so as to penetrate the threaded portion 10.
An appropriate number of adjusting materials 12 are inserted between the spindle 2 and the top surface of the spindle 2, and a nut 13 is attached to the screw portion 10.
By adjusting the thickness of the adjusting material 12, the spindle 2 can be swung in the axial direction, and the gap between the axial end surface of the guide vane 1 and the upper and lower covers is finely adjusted.

A step portion 14 is formed on the top of the arm boss 5, and a guide vane arm 15 is fitted in the step portion 14. A wear torque transmission member 16 is interposed between the arm boss 5 and the guide vane arm 15, and when the torque required to open and close the guide vane 1 exceeds a predetermined value, the wear torque transmission member 16 is provided. Sliding occurs and the arm boss 5
A drive torque larger than a predetermined magnitude is not transmitted from the guide vane arm 15. The free end of the guide vane arm 15 is connected to one end of a guide vane link 18 via a link pin 17, and the other end of the guide vane link 18 is connected to a guide ring 20 via a link pin 19.

Operating force is transmitted to the guide ring 20 by driving a guide vane servomotor (not shown), and the link pin 19, the guide vane link 18, the link pin 17, the guide vane arm are rotated by the rotation of the guide ring 20 at a predetermined angle. 15,
The operating force is transmitted in the order of the wear torque transmitting member 16, the arm boss 5, the spindle key 9, and the spindle 2 to open / close the guide vane 1.

Thus, according to the present invention, the two protrusions 21 and 22 are provided on the side surface of the arm boss 5 at a predetermined angular interval, and the included angle θ is the angle from the fully closed state to the fully opened state of the guide vane. Is set to. On the other hand, the above guide vane arm 15
A stopper 23 is vertically provided at the tip of the stopper 23.
Are located between the protrusions 21 and 22 during assembly.

FIG. 3 shows a plan view in which the stopper 23 is located between the protrusions 21 and 22, and the stopper on the guide vane arm 15 side is shown.
23 is movable between a position in contact with the protrusion 21 and a position in which it is provided on the protrusion 22, and this angle corresponds to the full opening angle of the guide vane.

Next, the operation of the above-described embodiment will be described.

The guide vane 1 is driven by a servomotor to guide ring 20, guide vane link 18, guide vane arm 15,
It is opened and closed by transmitting torque through the wear torque transmission member 16, the arm boss 5, and the spindle key 9. If a foreign substance or the like is sandwiched between the adjacent guide vanes 1 when the guide vanes 1 are opened or closed, the driving torque of the guide vanes 1 is significantly increased, and an abnormal load acts. The transmission torque of the wear torque transmission member 16 is set to a predetermined torque. Therefore, when the drive torque of the guide vane 1 is less than or equal to the predetermined torque, the guide vane arm 15 is rotated and the guide vane 1 is closed. Is continued. However, when the drive torque of the guide vane 1 becomes equal to or greater than the predetermined torque, the wear torque transmission member 16 slips, and the drive operation of the guide vane arm 15 continues while the closing operation of the guide vane 1 is interrupted. The other guide vane 1 in which no abnormality has occurred is not supported, and the closing operation is normally performed to adjust the flow rate. Even if the wear torque transmitting member 16 slips, the stopper 23 of the guide vane arm 15 is moved between the protrusions 21 and 22 of the arm boss 5, so that the drive of the guide vane arm 15 is not restricted. Be seen. The movement range of the guide vane 1 whose closing operation is interrupted is a stopper.
Since the guide vanes 1 are restrained by the contact between the protrusions 21 and 22, the swing angle of the guide vanes 1 caused by the flowing water is restricted.
At this time, since the arm boss 5 and the guide vane arm 15 are connected only via the wear torque transmitting member 16, the protrusions 21 and 22 and the stopper 23 are brought into contact with each other so that the relative positions of the two are changed. Can be set accurately. Thereby, the swing angle when the guide vane 1 swings independently can be regulated accurately. Further, since the rocking energy when the guide vane 1 rocks alone is attenuated by the wear torque transmitting member 16, the stopper 23 does not collide violently with the projections 21 and 22. This allows
Since the projections 21 and 22 and the stopper 23 do not need to be firmly formed and can be made small, the arm boss 5 and the guide vane arm 15 do not become large, and the guide vane opening / closing device is made compact. You can

When readjusting the open / close position of the guide vane 1 to the normal position while the closing operation is interrupted, loosen the wear torque transmission member 16 provided on the guide vane 1 to fully close the guide vane 1. The readjustment is completed by re-tightening the wear torque transmission member 16 after the stopper 23 is brought into contact with the protrusion 21 so as to be in contact with the position.

In this way, readjustment of the opening / closing position of the guide vane 1 can be easily performed.

Further, the gap between the axial end surface of the guide vane 1 and the cover 3 can be finely adjusted in the axial direction by moving the spindle 2 in the axial direction and adjusting the thickness of the adjusting material 12, so that the above-mentioned gap is properly held and guided. It is possible to avoid undesired contact between the vane 1 and the cover 11 and to smoothly open and close the guide vanes.

〔The invention's effect〕

As is apparent from the above description, according to the guide vane opening / closing device for a hydraulic machine of the present invention, when a torque of a predetermined value or more acts on the guide vanes due to the action of running water, the wear torque transmitting member slips and the guide Although the vane oscillates, the pair of protrusions provided on the side surface of the arm boss and the stopper provided on the guide vane arm come into contact with each other, so that the swing angle of the guide vane can be regulated.
As a result, it is possible to prevent the guide vanes from swinging largely independently and colliding with other guide vanes.

On the other hand, when the guide vane swings independently, the swing energy of the guide vane is attenuated by the wear torque transmitting member, so that the protrusion and the stopper do not collide violently. Accordingly, since it is not necessary to make the protrusion and the stopper strong, the protrusion and the stopper can be downsized. Therefore,
Even if the protrusion is provided on the side surface of the arm boss and the stopper is provided on the guide vane arm, the arm boss and the guide vane arm do not increase in size, and the guide vane opening / closing device can be made compact.

Further, since the guide vane arm is connected to the arm boss via the wear torque transmitting member having high assembly accuracy, the pair of protrusions projecting on the arm boss and the stopper projecting on the guide vane arm are brought into contact with each other. Thus, the relative angle between the arm boss and the guide vane arm can be accurately determined. As a result, not only can the swing angle when the guide vane swing independently be regulated, but also after the abrasion torque transmission member slips and the relative angle between the arm boss and the guide vane arm changes. Can be readjusted easily and accurately.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a guide vane operating device according to an embodiment of the present invention, FIG. 2 is an exploded perspective view of the same, and FIG. 3 is a motion explanatory view of a stopper provided on an arm boss and a guide vane arm. The figure is a perspective view showing the relationship between the guide vane arm and the arm boss. 1 ... Guide vane, 2 ... Spindle, 5 ... Arm boss, 9 ... Spindle key, 11 ... Cover, 15 ... Guide vane arm, 16 ... Friction torque transmitting member, 18 ...
Guide vane link, 20 …… Guide ring, 21,22 ……
Protrusion, 23 ... Stopper.

Claims (1)

[Claims] 1. An arm boss fixed to a spindle of a guide vane, a friction torque transmitting member attached between the arm boss and the guide vane arm, capable of transmitting a rotational torque up to a predetermined magnitude, and a side surface of the arm boss. A pair of protrusions projecting at a predetermined interval in the circumferential direction, and a stopper projecting on the guide vane arm side and positioned between the pair of protrusions. Guide vane opening / closing device for hydraulic machinery.