JP2009167948A - Operating mechanism of guide vane - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an operating mechanism of a guide vane having a simple structure without using a link mechanism which is easy in maintenance, and can reduce a dead time of a speed adjusting machine. <P>SOLUTION: The operating mechanism of the guide vane comprises a guide ring 12 vertically lifted and lowered by a hydraulic jack 11, a slide pin 16 fixed on an inner peripheral surface of the guide ring 12 at a base end and outwardly protruded in a horizontal direction, and a guide vane 13 having a shaft I having a spiral groove 21 in an axial direction and a vane 13a integrally fixed to the shaft I to adjust a water amount. By fitting a tip end of the slide pin 16 in the groove 21, the shaft I is rotated accompanied by the lifting/lowering of the guide ring 12 to rotate the vane 13a, thereby adjusting the opening of the guide vane 13. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a guide vane operating mechanism, and is particularly useful when applied to a guide vane that adjusts or blocks the flow rate of a turbine such as a Francis turbine or a Kaplan turbine.

  In a turbine such as a Francis turbine or a plan turbine, a plurality of guide vanes are installed at the inlet to adjust the amount of water flowing from the water channel into the turbine, and the angle of the guide vane with respect to the direction of water flow is determined via the guide vane operating mechanism. To adjust. This is because the inflow water amount is appropriately controlled by changing the gap between the adjacent guide vanes by such adjustment.

  FIG. 4 is an exploded perspective view showing a guide vane operating mechanism together with a guide vane according to the prior art. As shown in the figure, the operating mechanism rotates the guide ring 2 by the linear driving force of the hydraulic cylinder 1, and transmits the rotational force of the guide ring 2 to the guide vane 3 via the link mechanism. The guide vane 3 has a structure in which the blade 3a of the guide vane 3 is opened and closed to adjust or block the flow rate in the water turbine. More specifically, the tip of the piston rod 1a of the hydraulic cylinder 1 is connected to the guide ring 2 via the operation link pin 4, and the eccentric pin 5, the spectacle ring 6 and the weak point pin fixed to the guide ring 2. 7 is connected to the guide vane arm 8 through 7. The guide vane arm 8 is fixed to the upper end surface of the shaft portion main body 3b integrated with the blade portion 3a with a bolt 10 via a guide valve pressing plate 9. Thus, the driving force generated by the hydraulic cylinder 1 is transmitted to the guide ring 2 via the operation link pin 4 to rotate the guide ring 2. This rotational force rotates the shaft portion main body 3 b via the link mechanism including the eccentric pin 5, the glasses ring 6, and the weak point pin 7 and the guide vane arm 8. As a result, the blade portion 3a rotates to control the water flow C from the casing side A to the runner side B of the water turbine.

  Note that there is Patent Document 1 as a known document disclosing an operation mechanism of this type of guide vane.

Japanese Patent Application Laid-Open No. 08-284792

However, the following problems have occurred in the conventional technology as described above.
1) Since the linear driving force of the hydraulic cylinder 1 is converted into turning power and transmitted to the guide vane 3 via a complicated link mechanism, the number of parts is large and assembly adjustment takes time.
2) Moreover, since there are many sliding parts in a connection part, it is easy to produce a clearance gap in a connection part, As a result, the delay of control arises and the immobility time of the governor became long.
3) Further, the gap is accumulated in many connecting portions, and has a hysteresis characteristic in which the position differs between when the guide vane is opened and when it is closed.
4) Many incidental facilities were required, such as preparing an emergency power supply in case of power loss. Further, since it is necessary to close the guide vane by the rotation of the guide ring 2 in the horizontal plane, there is a problem that it is difficult to completely close the guide vane even at the time of an accident.

  In view of the above-described prior art, the present invention has a simple structure and is easy to maintain without using a link mechanism having a complicated structure and a large number of wear parts, and can contribute to a reduction in the dead time of the governor. An object of the present invention is to provide a guide vane operating mechanism capable of ensuring safety by automatically closing a guide vane without requiring a special device or the like when power is lost.

In order to achieve the above object, the first aspect of the present invention provides:
An operation mechanism of a guide vane configured to adjust a flow rate of a fluid introduced into a runner by adjusting a rotation amount of a plurality of guide vanes arranged in a ring shape,
A guide ring that is moved up and down by a drive source;
A slide pin fixed to the inner peripheral surface of the guide ring and protruding in the horizontal direction;
A shaft portion having a spiral groove along the axial direction, and a guide vane integrally fixed to the shaft portion and having a vane portion for adjusting the flow rate of the fluid,
The slide pin is inserted into the groove so that the shaft is rotated as the guide ring is raised and lowered, and the blade is rotated to adjust the opening of the guide vane. The operation mechanism of the guide vane is characterized by the above.

The second aspect of the present invention is:
In the operation mechanism of the guide vane described in the first aspect,
The groove is in the guide vane operating mechanism, wherein the guide vane is fully closed when the slide pin is fitted in the lowermost part thereof.

The third aspect of the present invention is:
In the operation mechanism of the guide vane described in the first or second aspect,
The slide pin is in a guide vane operating mechanism characterized in that a mechanical weak portion is formed in the middle of the slide pin so as to function as a weak pin.

  According to the present invention, the linear motion of the guide ring in the vertical direction is transmitted to the guide vane via the slide pin, and the linear motion of the slide pin is converted into the rotational force of the guide vane by the spiral groove. The guide vane can be rotated without using a complicated link mechanism. As a result, the number of parts can be greatly reduced, assembly adjustment can be easily performed, and the problem of easily creating a gap in the connecting portion as in the prior art can be solved, thereby delaying the control. In addition to being able to reduce the immobility time of the governor, the hysteresis characteristic that the position of the guide vane is different between when the guide vane is opened and when the guide vane is closed is not provided.

  When the power source cannot be controlled, such as when power is lost, the guide vanes can be closed by lowering the weight of the guide ring by its own weight, so the guide vanes operate automatically and reliably on the safe side without any additional equipment. Can be made.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is an explanatory view showing the principle of a guide vane operating mechanism according to an embodiment of the present invention, and FIG. 2 is an explanatory view showing the guide vane portion extracted. As shown in both figures, the operation mechanism adjusts the rotation amount of a plurality of guide vanes 13 (only one is shown in the figure) arranged in a ring shape to move from the casing side A to the runner side B. The water flow C to be introduced is adjusted. For this reason, the guide ring 12 that moves up and down in the vertical direction, the slide pin 16 with the base end fixed to the guide ring 12 and the shaft portion I of the guide vane 13 so that the distal end portion of the slide pin 16 is fitted along the axial direction. The spiral groove 21 is formed. Here, as clearly shown in FIG. 2 in particular, the groove 21 has a spiral shape that descends from the upper right to the lower left in the drawing at the upper part of the shaft portion I. As a result, when the slide pin 16 is raised, the shaft I is rotated in the clockwise direction, and when it is lowered, it is rotated in the counterclockwise direction via the streamlined blade portion 13a of the guide vane 13. Open and close the water wheel. Therefore, the guide vane 13 according to this embodiment is configured to be closed when it is rotated counterclockwise. This is because by using the lowering of the guide ring 12 due to its own weight in an emergency as the driving force of the guide vane 13, it is possible to perform a safe operation of closing the guide vane 13. The guide ring 12 is raised and lowered in the vertical direction by a hydraulic jack 11 which is a drive source.

  FIG. 3 is an exploded perspective view of the operation mechanism according to the present embodiment. More specifically, the slide pin 16 has a base end portion fixed to the inner peripheral surface of the guide ring 12 and protruded in the horizontal direction, and a distal end portion of the shaft portion provided on the slide shaft 18. It is inserted into the spiral groove 21 of I. The slide shaft 18 is fixed to the upper end surface of the shaft portion main body 13b with a bolt 20 via a guide vane connecting shaft 19. In this embodiment, the shaft portion I is constituted by the slide shaft 18, the guide vane connecting shaft 19 and the shaft portion main body 13b, and from the casing side A via the blade portion 13a fixed integrally to the shaft portion main body 13b. The water flow C flowing into the runner side B is controlled.

  Here, the spiral groove 21 is configured such that the guide vane is fully closed in a state where the slide pin 16 is fitted in the lowermost portion thereof. This is to realize fail-safe when the hydraulic jack 11 cannot be controlled. Further, the slide pin 16 in this embodiment has a mechanical weakened portion 16a formed in the middle thereof. This is because when the guide vane bites foreign matter and an excessive load force acts on the operation mechanism, the fragile portion 16a is damaged to protect other portions. That is, it is configured to function as a weak pin.

  According to this embodiment, the opening degree of the guide vane is adjusted by rotating the shaft portion I and rotating the blade portion 13a through the slide pin 16 as the guide ring 12 is moved up and down by driving the hydraulic jack 11. To do. That is, the linear lifting movement of the guide ring 12 is converted into the rotational operation force of the guide vane 13 by the spiral groove 21 without using a complicated link mechanism having a large number of connecting portions. The operation can be performed.

  The present invention can be effectively used in the industrial field of manufacturing and selling water turbines.

It is explanatory drawing which shows the principle of the operation mechanism of the guide vane which concerns on embodiment of this invention. It is explanatory drawing which extracts and shows the guide vane part of FIG. It is a disassembled perspective view which shows the operation mechanism of the guide vane which concerns on embodiment of this invention. It is a disassembled perspective view which shows the operation mechanism of the guide vane which concerns on a prior art.

Explanation of symbols

I shaft portion 11 hydraulic jack 12 guide ring 13 guide vane 13a blade portion 13b shaft portion main body 16 slide pin 16a fragile portion 18 slide shaft 19 guide vane connecting shaft 21 groove

Claims (3)

An operation mechanism of a guide vane configured to adjust a flow rate of a fluid introduced into a runner by adjusting a rotation amount of a plurality of guide vanes arranged in a ring shape,
A guide ring that is moved up and down by a drive source;
A slide pin fixed to the inner peripheral surface of the guide ring and protruding in the horizontal direction;
A shaft portion having a spiral groove along the axial direction, and a guide vane integrally fixed to the shaft portion and having a vane portion for adjusting the flow rate of the fluid,
The slide pin is inserted into the groove so that the shaft is rotated as the guide ring is raised and lowered, and the blade is rotated to adjust the opening of the guide vane. A guide vane operating mechanism characterized by that. In the operation mechanism of the guide vane according to claim 1,
The guide vane operating mechanism, wherein the groove is configured such that the guide vane is fully closed in a state where the slide pin is fitted in the lowermost part thereof. In the operation mechanism of the guide vane according to claim 1 or claim 2,
An operation mechanism for a guide vane, wherein the slide pin is configured so as to function as a weak pin by forming a mechanical weak portion in the middle thereof.

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