JPH0299776A - Guide vane operating mechanism of hydraulic machinery - Google Patents

Abstract

PURPOSE:To shorten the stop period due to the readjustment by drilling a hole for mounting and demounting an adjusting member in the radial direction in the cylinder part of a guide vane arm and forming a hole into which the adjusting member is engaged, on a guide vane spindle. CONSTITUTION:When a guide vane is adjusted, a nut 10 at the position where slide is generated is removed, and a frictional torque transmitting device 8 is demounted, and a guide vane arm 5 and a guide vane spindle 7 are set so as to be freely shiftable. In this state, an adjusting pin 18 is inserted into the hole 5d of an arm 5, and the pin 18 is engaged with the pin hole 7c of the spindle 7, adjusting the position of the arm 5. Therefore, it is confirmed than the relative position between the arm 5 and the spindle 7 is in a prescribed position relation, and the relative position between the arm 5 an the spindle 7 is easily adjusted.

Description

[Detailed description of the invention] [Purpose of the invention] (Industrial application field) The present invention relates to a guide vane operating mechanism for a hydraulic machine.

(Prior Art) Generally, hydraulic machines such as water turbines or pump turbines are provided with guide vanes so that the amount of water can be adjusted according to the output or pumping amount required from the system. This guide vane is normally driven to open and close by a servo motor, but
If a foreign object or the like is caught between the adjacent guide vanes during the opening/closing operation, there is a risk that the guide vanes may be destroyed due to excessive load. Therefore, a member that transmits torque by friction is provided at the base of the guide vane arm, and when an overload occurs, this torque transmission member slips and rotates the guide vane spindle and guide vane arm, ensuring the safety of the guide vane. It is possible to do so.

FIG. 3 shows a longitudinal sectional view of a guide vane operating mechanism of a conventional hydraulic machine. Reference numeral 1 in the figure is a guide ring, and a flange portion 1 is provided on the outer peripheral side of the guide ring 1.
A is provided. A large number of links 3 are swingably provided on the upper part of the flange portion 1a via link pins 2 at equal intervals over the entire circumference, and furthermore, the other end of the link 3 is provided with an arm pin 4 provided on the other end of the link 3. An arm portion 5a of the guide vane arm 5 is swingably connected.

Here, the shape of this guide vane arm 5 is the cylindrical portion 5b.
It has a shape in which the arm portion 5a is provided protrudingly from the outer side thereof. A guide vane spindle 7 penetrated through a hole 6a of the upper cover 6 is inserted into the cylindrical portion 5b. Further, a small diameter portion 7a is formed in the upper part of this guide vane spindle 7, and a friction torque transmission device 8 is interposed between this small diameter portion 7a and the inside of the cylindrical portion 5b of the guide vane arm 5. . This frictional torque transmission device 8 transmits a normal torque during normal operation, but is configured to cause slippage when the guide vane gets caught in a foreign object or the like and an excessive load is generated.

Further, a threaded portion 7b is provided at the upper part of this small diameter portion 7a, and the threaded portion 7b is connected to the guide vane arm 5.
The guide vane spindle 7 is connected to the cylindrical portion 5b by passing through the hole 9a of the guide vane arm presser plate 9 installed on the cylindrical portion 5b, and threading a nut 10 into the threaded portion 7b. . At this time, an adjustment liner 11 for adjusting a side gap (not shown) of the guide vane is interposed between the guide vane spindle 7 and the guide vane arm presser plate 9. on the other hand,
A bushing 12 is interposed between the upper cover 6 and the guide vane spindle 7. Further, a groove 5c is provided in the circumferential direction on the lower side surface of the cylindrical portion 5b of the guide vane arm 5, and a hole 5c is provided in the upper surface of the upper cover 6 in the groove 5C.
The protrusion 13 of the thrust bearing 13 provided concentrically with a
a is engaged. In this way, whether the projection 13a of the thrust bearing 13 or the guide vane arm 5? By being engaged with g 5 d, upward thrust of the guide vane can be suppressed.

Therefore, if a foreign object or the like is caught between adjacent guide vanes during the opening/closing operation of the guide vanes, an excessive load is applied to the guide vanes. However, this excessive load is absorbed by the friction torque transmission device 8 interposed between the guide vane arm 5 and the guide vane spindle 7.
The guide vane arm 5 is driven together with the other guide vane arms 5, but the guide vane spindle 7 connected to the guide vane is not driven due to the sliding of the frictional torque transmission device 8. Therefore, the safety of the guide vane can be ensured and damage to the guide vane can be prevented.

(Problem to be Solved by the Invention) However, when an excessive load is applied to the guide vane, the friction torque transmission device interposed between the guide vane arm and the guide vane spindle slips, causing the guide vane arm to drive but not to move. , the guide vane spindle is not driven. As a result, the normal positions of the guide vane arm and guide vane spindle deviate, and in order to readjust this positional deviation, it is necessary to readjust the friction torque transmission device, and the bolt and guide vane arm retaining plate must be removed. It won't happen.

Also, by removing this bolt and the guide vane arm presser plate, the guide vane will drop down.
It is also necessary to readjust the guide vane side gap.
The problem is that the water in the casing must be drained, resulting in a longer outage period. Furthermore, machining of the guide vane arm is difficult, and the presence of the guide vane arm makes assembly of the thrust bearing troublesome.

The present invention has been made in view of the above-mentioned problems, and it is necessary to readjust the guide vane side gap when the relative position of the guide vane arm and the guide vane spindle shifts and this position shift is readjusted. The purpose of the present invention is to provide a guide vane operating mechanism for a hydraulic machine that does not require adjustment, thereby shortening the period of stoppage due to readjustment, and also facilitates machining and disassembly and assembly. shall be.

[Structure of the invention]

(Means for Solving the Problems) The present invention provides a hydraulic machine in which a guide vane arm is connected to a guide ring via a link, and a friction torque transmission device is interposed between the guide vane arm and the guide vane spindle. In the guide vane operating mechanism, the cylindrical portion of the guide vane arm is radially bored with a hole for attaching and detaching an adjustment member for adjusting the relative position of the guide vane arm and the guide vane spindle, and The vane spindle is provided with a hole that is engaged by an adjustment member that passes through the hole in the radial direction, and
The guide vane spindle is characterized in that a groove is provided at an appropriate location on the side surface of the guide vane spindle, and a thrust bearing fixed to the upper cover is engaged with the groove.

(Function) If a foreign object is caught between adjacent guide vanes during the opening/closing operation of the guide vanes, an excessive load is applied to the guide vanes. However, this excessive load is absorbed by the friction torque transmission device interposed between the guide vane arm and the guide vane spindle, so the guide vane arm is driven together with the other guide vane arms, but the guide vane The coupled guide vane spindle is not driven by the frictional torque transmission device slipping.

When adjusting the guide vane, first remove the friction torque transmission device so that the guide vane arm and guide vane spindle can move freely to some extent, and in this state, An adjustment member is attached to the hole in the vane arm, and while adjusting the position of the guide vane arm, the adjustment pin is adjusted to engage with the hole in the guide vane spindle. The guide vane connected to the guide vane spindle and the guide ring are in a predetermined relative position when the A alignment member attached to the hole of the guide vane arm is engaged with the hole of the guide vane spindle. This makes it possible to easily adjust the relative position between the guide vane arm and the guide vane.

(Example) Hereinafter, an example of the present invention will be described with reference to the accompanying drawings.

FIG. 1 is a longitudinal sectional view of a guide vane operating mechanism according to an embodiment of the present invention, and FIG. 2 is a top view thereof.

Reference numeral 1 in the figure is a guide ring, and this guide ring 1
A flange portion 1a is provided on the outer peripheral side surface of the flange portion 1a. A large number of links 3 are swingably provided on the upper part of the flange portion 1a via link bins 2 at equal intervals over the entire circumference, and furthermore, a guide vane is provided at the other end of the link 3 via an arm bin 4. An arm portion 5a of the arm 5 is swingably connected. Here, this guide vane arm 5
The shape is such that the arm portion 5a is provided protruding from the outer side of the cylindrical portion 5b. A guide vane spindle 7 penetrated through a hole 6a of the upper cover 6 is inserted into the cylindrical portion 5b.

Further, a hole 5d passes through the cylindrical portion 5b in the radial direction at a location facing the arm portion 5a. Further, the upper inner diameter of the cylindrical portion 5b is formed to be large, and a friction torque transmission device 8 is provided in an annular groove 5e formed between the guide vane spindle 7 and the guide vane arm 5. The frictional torque transmitting device 8 transmits a regular torque during normal operation, but is configured to slip when the guide vane 19 gets caught in a foreign object or the like and generates an excessive load. Further, a threaded portion 7b is provided at the upper part of the guide vane spindle 7, and this threaded portion 7b
Insert the cover 14 and pointer 15 into the holder and secure with the nut 10. Further, a pin hole 7C that is aligned with the hole 5d of the guide vane arm 5 when the guide vane 19 is in its normal position is bored in the outer surface of the guide vane spindle 7. on the other hand,
A groove 7d is provided in the circumferential direction of the guide vane spindle 7 at an appropriate location protruding above the upper cover 6, and a thrust bearing 13 divided into a plurality of radial parts is incorporated into the groove 7d. . Furthermore, this thrust bearing 13
Attach the mounting bolt 1 to the upper cover 6 via the shim 16 at the bottom.
It is fixed at 7.

The shim 16 is used to adjust the guide vane side gap (not shown), and is available in several different thicknesses.

Therefore, if a foreign object or the like is caught between adjacent guide vanes during the opening/closing operation of the guide vanes, an excessive load is applied to the guide vanes. However, since this excessive load is absorbed by the friction torque transmission device 8 interposed between the guide vane arm 5 and the guide vane spindle 7, the guide vane arm 5 is driven together with the other guide vane arms 5. However, the guide vane spindle 7 connected to the guide vane is not driven due to the frictional torque transmission device 8 slipping. Therefore, the safety of the guide vane can be ensured and damage to the guide vane can be prevented. At this time, the pointer 15 fixed to the guide vane spindle 6 also does not move, so it can be confirmed at a glance that the friction torque transmission device 7 has slipped.

When adjusting the guide vane 19, remove the nut 10 at the location where it has slipped, and then tighten the pointer 15 and cover 14.
from the threaded part 7b. Furthermore, by removing the friction torque transmission device 8, the guide vane arm 5 and the guide vane spindle 7 can be moved freely to some extent. In this state, guide vane arm 5
The adjustment pin 18 is inserted into the hole 5d, and the adjustment pin 18 is engaged with the pin hole 7c of the guide vane spindle 7 while adjusting the position of the guide vane arm 5. Adjustment pin 18
is engaged with the hole 5d of the guide vane arm 5 and the pin hole 7C of the guide vane spindle 7, thereby confirming that the relative positions of the guide vane arm 5 and the guide vane spindle 7 are in a predetermined positional relationship. is possible,
The relative position between the guide vane arm 5 and the guide vane 19 can be easily adjusted.

Note that this adjustment pin 18 is removed when the guide vane of the hydraulic machine is in operation.

〔Effect of the invention〕

As described above, the present invention provides a guide vane operating mechanism for a hydraulic machine in which a guide vane arm is connected to a guide ring via a link, and a friction torque transmission device is interposed between the guide vane arm and the guide vane spindle. In the cylindrical portion of the guide vane arm, a hole is bored in the radial direction for attaching and detaching an adjustment member for adjusting the relative position of the guide vane arm and the guide vane spindle, and the guide vane spindle has a radial hole. A hole is provided in which the adjustment member penetrates through the hole in the direction of the guide vane spindle, and a groove is provided at an appropriate location on the side surface of the guide vane spindle. As a result, if a foreign object is caught between adjacent guide vanes during the opening/closing operation of the guide vanes, an excessive load will be applied to the guide vanes, but this excessive load will be applied between the guide vane arm and the guide vane spindle. The friction torque transmitting device interposed between the guide vane arm and the guide vane arm is driven together with the other guide vane arms, but the friction torque transmitting device interposed in the guide vane spindle is absorbed by the friction torque transmitting device causing the slippage. As a result, the relative positions of the guide vane arm and the guide vane spindle deviate from a predetermined positional relationship. When adjusting the position of the guide vane arm and the guide vane spindle that have shifted in this way, insert the adjustment member into the hole bored in the guide vane arm, adjust the guide vane arm, and adjust the position of the guide vane arm and the guide vane spindle. By adjusting the adjusting member so as to engage the hole provided in the guide vane spindle, the relative position of the guide vane arm and the guide vane connected to the guide vane spindle can be easily positioned in a predetermined positional relationship. can be done.

In addition, since the thrust bearing is directly engaged with the guide vane spindle, there is no need to disassemble the thrust bearing and shim during adjustment.Furthermore, since the guide vane spindle does not go down, the guide vane There is no need to readjust the side gap, and the adjustment work can be easily performed without the need to drain water from the casing.

Further, by utilizing the above structure, it is not necessary to use a weak point pin, and the structure of the guide vane operating mechanism of a hydraulic machine can be simplified.

id vane arm, 5a... arm part, 5b... cylindrical part, 5c... groove, 5d... hole, 5e... annular groove, 6... upper cover, 6a... hole, 7... Guide vane spindle, 7a... Small diameter part, 7b... Threaded part, 7C... Pin hole, 7d... Groove, 8... Friction torque transmission device, 9... Guide vane Arm holding plate, 9a
... hole, 10 ... nut, 11 ... adjustment liner,
12... Bushing, 13... Thrust bearing, 13a
...Protrusion, 14...Cover 15...Pointer, 16
...Shim, 17...Mounting bolt, 18...Adjustment pin, 19...Guide vane.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view of a guide vane operating mechanism according to the present invention, FIG. 2 is a top view of the guide vane operating mechanism according to the present invention, and FIG. 3 is a longitudinal sectional view of a conventional guide vane operating mechanism.

Claims (1)

[Claims] 1. A guide vane operating mechanism for a hydraulic machine, in which a guide vane arm is connected to a guide ring via a link, and a friction torque transmission device is interposed between the guide vane arm and the guide vane spindle. In the cylindrical portion of the guide vane arm, a hole is bored in the radial direction for attaching and detaching an adjustment member for adjusting the relative position of the guide vane arm and the guide vane spindle, and the guide vane spindle has a radial hole. A hole is provided in the direction in which the adjustment member is engaged, passing through the hole, and a groove is provided at an appropriate location on the side surface of the guide vane spindle,
A guide vane operating mechanism for a hydraulic machine, characterized in that a thrust bearing fixed to an upper cover is engaged with this groove. 2. The guide vane operating mechanism for a hydraulic machine according to claim 1, wherein a cover and a pointer are fixed to the upper part of the guide vane spindle.