JPH0674140A - Guide vane opening/closing device of hydraulic machinery - Google Patents

Abstract

PURPOSE:To simplify the shape and structure of respective component parts without degrading the advantage of a device itself by using a ring key which is engaged with a groove formed at the spindle of a guide vane in a circumferential direction, and holding the guide vane at the casing of a hydraulic machinery. CONSTITUTION:A main arm lever 7 is connected with a guide ring through a link 2. Besides, one end of a guide vane arm 3 is connected with the main arm lever 7 with a weak point pin 6, and the other end is fixed at the spindle 4a of the guide vane 4. Moreover, one end of an auxiliary arm lever 8 is connected with the spindle 4a through a frictional torque transmitting device 9, and the other end is loosely-fitted to the weak point pin 6. Moreover, the capacity of the frictional torque transmitting device 9 is set so as to satisfy a specified condition. With this constitution, the spindle 4a is held at the easing of a hydraulic machinery by a ring key 17 which is engaged with a groove 4b formed at the spindle 4a in a circumferential direction.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a guide vane opening / closing device for a hydraulic machine.

[0002]

2. Description of the Related Art Generally, a hydraulic machine such as a water turbine or a pump water turbine includes a guide vane for adjusting a water flow flowing in a flow path from a casing to a runner. An example of such a guide vane opening / closing device is schematically shown in FIG. In this figure, the casing and runner of the hydraulic machine are omitted. A guide ring 1 rotatably attached to the casing (not shown) and rotated by a servomotor 5 drives a guide vane 4 rotatably attached to the casing about a guide vane spindle 4a. The guide vane 4 is rotatably installed on the casing (not shown) by a guide vane spindle 4a integrally formed with the guide vane 4, and the tip end of a guide vane arm 3 whose base end is fixed to the guide vane spindle 4a and the guide ring 1 are provided. And are connected by a link 2.

In the guide vane opening / closing device having the above structure, when the guide ring 1 is rotated by the servo motor 5, the movement of the guide ring 1 is transmitted to the guide arm 3 via the link 2 and each guide vane 4 is moved. The guide vane spindle 4a is rotated to open and close the gap between the guide vanes 4, and the water flow flowing between the guide vanes and reaching the runner (not shown) is adjusted.

When a large amount of foreign matter such as earth and sand is mixed in the power water, the foreign matter such as sand may be caught between the guide vanes when the guide vanes are opened and closed, which may cause an accident. The connection point between the guide vane arm 3 and the guide vane arm 3 is connected by a so-called weak point pin 6 having a small mechanical strength. That is, since the driving force required to open and close the guide vane 4 becomes large when foreign matter is caught, the weak point pin 6 is broken by this, and the transmission of the driving force from the guide ring 1 to the guide vane 4 is interrupted. For,
Damage to the guide vanes 4 due to foreign matter biting can be avoided.

However, in the guide vane opening / closing device using the weak point pin having the above-described structure, the guide vane that is trapped by foreign matter is protected, but the guide vane becomes unrestrained by the breakage of the weak point pin 6, and is prevented by the water flow. In some cases, this could lead to collisions with the adjacent guide vanes, causing the hydraulic machine to become inoperable after the weak point pin broke.

In order to solve the above problems, the present applicant has disclosed "Guide vane opening / closing device for hydraulic machine" in Japanese Patent Publication No. 56-532. The opening / closing device of the disclosed invention prevents the guide vane from being unrestrained after the weak point pin is broken, and prevents the hydraulic machine from being inoperable. It is configured as shown in FIG. 4, FIG. 5, and FIG.

In these figures, a main arm lever 7 is rotatably provided on the guide vane arm 3, and an auxiliary arm lever 8 is provided on the upper end of the guide vane spindle 4a via a friction torque transmitting device 9. Installed. The weak point pin 6 connects the main arm lever 7 and the auxiliary arm lever 8. Weak point 10 of weak point pin 6
Is provided at the boundary between the main arm lever 7 and the guide vane arm 3.

The auxiliary arm lever 8 and the weak point pin 6
The engagement hole 12 for forming a small gap 11 with respect to the weak point pin 6 is used.
And are in a state of play. Further, the main arm 7 is connected to the link 2 from the guide ring 1 (not shown in FIGS. 4 to 6) by the link pin 13.

Further, a guide vane side gap adjusting bolt 15 is screwed into the upper end surface of the guide vane spindle 4a via a guide vane pressing plate 14. In the figure, reference numeral 16 is a key for fixing the guide vane arm 3 to the guide vane spindle 4a, and 21 is a nut.

The guide vane opening / closing device configured as described above operates as follows. That is, during normal operation of the hydraulic machine, the force acting on the guide vanes 4 is
It is transmitted to the guide ring 1 in the order of key 16 → guide vane arm 3 → weak point pin 6 → main arm lever 7 → link pin 13 → link 2. Here, since the auxiliary arm lever 8 and the weak point pin 6 are in a loosely engaged state as described above, the auxiliary arm lever 8 does not participate in the transmission of the force.

Now, consider a case where foreign matter is caught in the guide vane. In this case, an excessive operating force is generated, which causes the weak point pin 6 to break at the weak point portion 10, the guide vane arm 3 and the key 16 are separated from the force transmission path, and the force is transmitted through the friction torque. The transmission device 9 and the auxiliary arm lever 8 are used. That is, the transmission of the force after breakage of the weak point pin 6 is as follows: guide vane 4 → friction torque transmitting device 9 → auxiliary arm lever 8 → weak point pin 6 → main arm lever 7 → link pin 13
→ Link 2 → It will be done by the transmission path of the guide ring 1.

Therefore, by setting the capacity of the friction torque transmitting device 9 so as to have the following relationship, the weak point pin 6
It is possible to solve the problem of the operation of the hydraulic machine after the fracture of the. That is, (weak point pin 6 breaking torque)> (friction torque transmitting device 9
(Maximum torque generated by the above)> (maximum hydraulic moment acting on the guide vane 4) is established, the friction torque transmitting device 9 may lose an excessive operating force after the weak point pin 6 breaks. Up to the point where the guide vane 4 can be held against the hydraulic moment acting on it. The guide vane opening / closing device configured as described above has various effects as described below.

(1) The operation force is transmitted through the route of the main arm lever 7 and the weak point pin 6 during normal operation, and when the weak point pin 6 is broken, the friction torque transmission device 9, the auxiliary arm lever 8 and the main arm lever 8 are transmitted. This is done by the path of the arm lever 7. Since these paths do not participate in the transmission of the operation force at the same time, each component can be designed and adjusted independently, and the reliability can be increased.

(2) Since the clearance gap 11 between the auxiliary arm lever 8 and the weak point pin 6 may be very small, it is sufficient to withstand the hydraulic imbalance force almost at the same time as the weak point pin 6 breaks. A friction force can be obtained. Therefore, even if the weak point pin 6 breaks near the fully closed point of the guide vane 4, not only is there a possibility that adjacent guide vanes will collide with each other, but also the guide vane unconstrained range is narrow, so the guide vanes are not restricted. It does not cause a flapping phenomenon. Furthermore, since the unrestrained range is narrow as described above,
Since the movement of the guide vane can be suppressed before the inertial force due to the rotation is applied to the guide vane, it is not necessary to shock-lock the guide vane 4 after the weak point pin 6 is broken. (3) Since the friction torque transmission device 9 may be set to have a capacity sufficient to withstand the maximum hydraulic moment, its adjustment is extremely easy. (4) In order to return the guide vane opening / closing device to the original state after the weak point pin 6 is broken, it suffices to engage the new weak point pin in the normal position, and the original state is easily restored.

(5) The means for protecting the guide vanes when foreign matter is caught in the guide vane opening / closing device configured as described above is incorporated in the guide vane opening / closing device, and a special space for installing the protection means is required. do not do.

[0016]

As described above, the guide vane opening / closing device disclosed above has many advantages.
The guide vane arm 3, the main arm lever 7, the auxiliary arm lever 8, and the guide vane holding plate 14 are also shown in FIG.
Since the shapes and structures of parts such as the above are complicated, there is a drawback that the number of processing steps for those parts is large and the cost is increased.

The present invention has been made based on the above circumstances, and can be manufactured with a simple structure, high reliability and low cost, without impairing any advantage of the guide vane opening / closing device disclosed above. (EN) Provided is a guide vane opening / closing device for a hydraulic power machine, which can reliably prevent the swinging of an unconstrained guide vane by a simple operation mechanism.

[0018]

A guide vane opening / closing device of the present invention includes a guide ring, a main arm lever connected to the guide ring via a link, and one end of the main arm lever via a weak point pin. A guide vane arm connected to the guide vane spindle at the other end; and an auxiliary arm lever having one end connected to the guide vane spindle via a friction torque transmitting device and the other end loosely engaged with the weak point pin. In the guide vane opening / closing device, the capacity of the friction torque transmitting device is set to (torque at weak point pin breaking)> (maximum torque generated by friction torque transmitting device)> (maximum hydraulic moment acting on guide vane),
The guide vane spindle is held in the casing of the hydraulic machine by a ring key that engages with a groove in the circumferential direction provided in the guide vane spindle.

[0019]

In the guide vane opening / closing device of the present invention having the above-mentioned structure, the main arm lever is provided with the ring arm which engages with the circumferential groove of the guide vane spindle to hold the guide vane. The guide vane 4 can be directly connected, and it is not necessary to carve the upper surface of the guide vane arm to fit the main arm lever therein. The structure of the guide vane arm is simplified, and the main arm lever is only 1 It can be a single plate configuration.

Further, since the guide vane is held by the ring key, the height relationship between the guide vane, the main arm lever and the auxiliary arm lever is always constant,
As a result, the friction torque transmission device can be mounted directly on the upper end of the guide vane spindle, and the structure of the auxiliary arm lever is also simplified.

[0021]

1 is a sectional view of an embodiment of the present invention, and FIG. 2 is an exploded perspective view thereof. 1 and 2, a circumferential groove 4b is provided near the upper end of the guide vane spindle 4a, and a circular recess 3a is concentrically provided on the upper surface of the boss of the guide vane arm 3. The main arm lever 7 is directly connected to the guide vane spindle 4a by a ring key 18 that engages with the groove 4b and the recess 3a.

Further, in the circumferential groove 3b provided in the boss portion of the guide vane arm 3, the casing C of the hydraulic machine is provided.
An inner flange 18a at the upper end of the thrust bearing 18 supported by the is engaged. A guide vane side gap adjusting shim 20 is interposed between the thrust bearing 18 and the casing C. In the figure,
Reference numeral 19 denotes a cover attached to the upper surface of the boss portion of the auxiliary arm 8.

The position of the weak point portion 10 of the weak point pin 6, the gap 11 in the engaging hole 12 with the weak point pin 6 of the auxiliary arm lever 8, the link pin 13 connecting the link 2 and the main arm lever 7, This is the same as in the conventional guide vane opening / closing device shown in FIGS. However, both the weak point pin 6 and the link pin 13 have the guide vane arm 3
The front end portion that engages with the main arm lever 7 and the front end portion that engages with the main arm lever 7 have smaller diameters than the other portions. Further, in the above embodiment, the capacity of the friction torque transmission device 9 is set so as to have the following relationship. That is, (weak point pin 6 breaking torque)> (friction torque transmitting device 9
Generated maximum torque)> (maximum hydraulic moment acting on guide vane 4)

In the embodiment having the above construction, the force acting on the guide vanes 4 during normal operation of the hydraulic machine is as follows: guide vanes 4 → key 16 → guide vane arm 3 → weak point pin 6
→ Main arm lever 7 → Link pin 13 → Link 2 → Guide ring 1 is transmitted. Since the auxiliary arm lever 8 has a loose relationship with the weak point pin 6, it does not participate in the transmission of the force.

Next, when foreign matter is caught in the guide vane, an excessive operating force is generated, which causes the weak pin 6
Is broken at its weak point 10, the guide vane arm 3 and the key 16 are separated from the force transmission path, and the force is transmitted via the friction torque transmission device 9 and the auxiliary arm lever 8. That is, the transmission of the force after the weak point pin 6 is broken is transmitted from the guide vane 4 → friction torque transmitting device 9 → auxiliary arm lever 8 → weak point pin 6 → main arm lever 7 → link pin 13 → link 2 → guide ring 1. It will be done on the route. The capacity of the friction torque transmitting device 9 is as described above (torque when the weak pin 6 breaks)> (friction torque transmitting device 9
(Maximum generated torque of the guide vane 4)> (maximum hydraulic moment acting on the guide vane 4), the friction torque transmitting device 9 can release an excessive operating force after the weak point pin 6 breaks. Sliding, guide vane 4 in that respect
Can be held against the hydraulic moment acting on it.

As is clear from the above description, in the above-described embodiment, protection of the guide vane when foreign matter is caught, prevention of unconstrained guide vane when the weak point pin breaks, etc. You can do it. Moreover, in the conventional guide vane opening / closing device, as shown in FIG. 4, the guide vane 4 is held by the guide vane holding plate 14 via the guide vane holding plate 14 in a hanging manner. It was necessary to secure a space for mounting the guide vane arm 3, and it was necessary to cut the upper surface of the guide vane arm 3 and fit the main arm lever 7 therein.

On the other hand, in the embodiment of the present invention, as shown in FIG. 1, the guide vane 4 is held by the ring key 17 engaging with the circumferential groove 4b of the guide vane spindle 4a. Therefore, the main arm lever 7 can be directly connected to the guide vane 4, and it is not necessary to cut the upper surface of the guide vane arm 3 and fit the main arm lever 7 therein. Therefore, the structure of the guide vane arm 3 is simplified, and the main arm lever 7 can be a simple one-plate structure.

Further, since the guide vane 4 is held by the ring key 17, the height relationship between the guide vane 4, the main arm lever 7 and the auxiliary arm lever 8 is always constant, whereby the friction torque transmitting device 9 is provided. Can be directly mounted on the upper end of the guide vane spindle 4. As a result, the structure of the auxiliary arm lever 8 is also simplified.

Further, since the guide vane arm 3 is held by the thrust bearing 18, the conventional guide vane pressing plate 14 is unnecessary, and instead, a thin plate cover 19 having a function of protecting the friction torque transmitting device 9 is provided. It should be provided.

As is clear from the above, the guide vane opening / closing device of the present invention has a simple structure, high reliability, and low cost, without impairing the function of the conventional guide vane opening / closing device.

[0031]

According to the guide vane opening / closing device of the present invention having the above-described structure, the shape and structure of each constituent member are simplified without any loss of the advantages of the conventional guide vane opening / closing device. Can be high and at low cost.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of an embodiment of the present invention and its exploded perspective view.

FIG. 2 is an exploded perspective view thereof.

FIG. 3 is a schematic view of an example of a conventional guide vane opening / closing device.

FIG. 4 is a sectional view of a main part of a conventional guide vane opening / closing device.

FIG. 5 is a plan view thereof.

FIG. 6 is an exploded perspective view thereof.

[Explanation of symbols]

 1 ... Guide ring 2 ... Link 3 ... Guide vane arm 4 ... Guide vane 4a ... Guide vane spindle 5 ... Servo motor 6 ... Weak point pin 7 ... Main arm lever 8 Auxiliary arm lever 9 Friction torque transmission device 10 Weak point 11 Gap 12 Engagement hole 13 Link pin 14 Guide vane retainer plate 15 Guide vane side gap adjusting bolt 16 ………… Key 17 ………… Ring key 18 ………… Thrust bearing 19 ……… Cover 20 ………… Guide vane side gap adjusting shim

Claims (1)

[Claims] 1. A guide ring, a main arm lever connected to the guide ring via a link, and a guide having one end connected to the main arm lever via a weak point pin and the other end fixed to a guide vane spindle. A vane arm and an auxiliary arm lever, one end of which is connected to the guide vane spindle via a friction torque transmission device and the other end of which is loosely engaged with the weak point pin, are provided with a capacity of the friction torque transmission device Torque)> (maximum torque generated by friction torque transmission device)> (maximum hydraulic moment acting on guide vane)
A guide vane opening / closing device for a hydraulic machine, wherein the guide vane spindle is held in a casing of the hydraulic machine by a ring key that engages with a circumferential groove provided in the guide vane spindle.