JP2556555Y2 - Guide vane last receiving device for water turbine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Purpose of the Invention] (Industrial application field) The present invention relates to a guide vane thrust receiving device which receives an axial thrust force of a guide vane during operation of a water turbine.

(Prior Art) FIG. 2 is a view showing a schematic configuration of a general rigid-shaft type water turbine. The lower side is covered by the lower cover 4. A plurality of movable guide vanes 5 for changing the opening of the water port are arranged radially outward of the runner 2, and a plurality of stay vanes 6 are further arranged outside the movable guide vanes 5.
A spiral casing 7 connected to the penstock is disposed outside the casing.

By the way, in such a water turbine, an upward thrust force acts on the guide vane during the operation thereof, so that a thrust receiver for regulating the upward movement is provided.

That is, FIG. 3 is a longitudinal sectional view of the guide vane portion, in which a collar 11 is inserted into a recess 10 formed in the lower cover 4, and a lower spindle of the guide vane 5 is inserted into the collar 11.
5a is inserted.

The upper spindle 5b of the guide vane 5 penetrates through the upper cover 3 and protrudes above the upper cover 3, and an arm 12 for operating the guide vane is connected to a top end portion thereof by a guide vane key 12a.

That is, the upper cover 3 has a stepped hole with a large diameter at the top.
The upper spindle 5b of the guide vane 5 is inserted into the stepped hole 13. A tubular guide vane seat 14 is inserted into the upper spindle 5b,
The guide vane seat 14 is inserted and fixed into the large diameter portion of the stepped hole 13, and the lower end surface of the guide vane seat 14 and the stepped hole 13 are fixed.
A U-shaped packing 16 attached to a packing base 15 is interposed between the stepped portion 13a.

Meanwhile, the upper spindle 5b of the guide vane 5, between its upper spindle 5b stepped portions 5b ₁ and the arm 12 formed on the thrust flanged collar 17 and is held, on the arm 12 Attached arm holding plate
By fastening the upper spindle 5b to the upper spindle 5b with bolts 19 and nuts 20, the axial movement of the flanged thrust collar 17 with respect to the upper spindle 5b is prevented. The flange portion of the thrust collar 17 is inserted into a space formed between the guide vane seat 14 and a thrust bearing 21 fixed to the guide vane seat 14.

On the other hand, a guide ring sliding piece 22 is provided on the upper end of the upper cover 3.
The guide ring 23 is fitted through the
One end of a guide vane link 24 is connected via a pin 25 to a flange 23a projecting from the inner peripheral surface of 23, and the other end of the guide vane link 24 is connected to the arm 12 via a pin 26. . The guide vane 5 is opened and closed by rotating the guide ring 23 by a servo motor (not shown).

When the guide vane 5 is actuated upward during the operation of the turbine, and the guide vane 5 is moved upward, the flange portion of the thrust collar 17 contacts the thrust bearing 21 to prevent further movement. The thrust force is received by the thrust bearing 21.

(Problems to be Solved by the Invention) However, in such an apparatus, the thrust bearing 21 is fixed to the upper portion of the guide vane seat 14, and the guide vane holding plate 18,
There is a problem that it is necessary to use the bolt 19 and the nut 20 and the number of parts is increased. Furthermore, since the guide vane operating arm 12 is connected to the guide ring 23 via the guide vane link 24 as described above, the upper surface of the arm 12 needs to be aligned with the upper surface of the flange 23a of the guide ring 23. Further, the position of the arm 12 also performs the positioning action of the thrust collar 17, and the guide vane seat 14,
Since it is affected by the height of the thrust bearing 21, there is a problem that the dimensional control must be strictly controlled by stacking the illustrated H dimension at the intersection.

In view of the above, the present invention eliminates the need for a thrust bearing and the like, thereby reducing the number of parts, and enabling the guide vane arm to be fixed at an arbitrary position on the upper spindle. The aim is to obtain a device.

[Structure of device]

(Means for Solving the Problems) The present invention is characterized in that a thrust collar which receives a thrust force applied to the guide vane during operation of the turbine is attached to a position facing the end face of the guide vane flange in the turbine cover. It is.

(Operation) When the guide vane moves in the axial direction due to the axial thrust force acting on the guide vane during operation of the turbine, the guide vane flange formed at the end of the guide vane is attached to one end surface of the cover. It abuts on the provided thrust collar and its movement is prevented. In this case, there is no need to provide a thrust bearing above the guide vane seat, and it is not necessary to mount a thrust collar on the upper spindle corresponding to the thrust bearing.

(Embodiment) An embodiment of the present invention will be described below with reference to FIG.

The upper cover 3 is provided with a stepped hole 13 having a large diameter at the upper part. The upper spindle 5b of the guide vane 5 is inserted into the stepped hole 13, and the guide vane is provided at the top of the upper spindle 5b. By driving the key 12a, the arm 12 for operating the guide vane is connected so that any positioning can be performed. A tubular guide vane seat 14 is fitted into the upper spindle 5b, and the guide vane seat 14 is inserted and fixed to the large diameter portion of the stepped hole 13, and the guide vane seat 14 is
A U-shaped packing 16 attached to a packing table 15 is interposed between the lower end surface of the base member and the stepped portion 13a of the stepped hole 13.

A large-diameter recess 13b concentric with the step hole 13 is also formed on the lower end surface side of the step hole 13, that is, on the guide vane 5 side, and the lower end of the upper spindle 5b of the guide vane 5 is formed in the recess 13b. The guide vane collar 5d formed integrally with the part is inserted. Further, a ring-shaped thrust collar 23 is fixed to the bottom surface of the concave portion 13b, that is, the surface facing the guide vane flange 5d. When the turbine is stopped, the gap between the guide vane collar 5d and the thrust collar 23 is selected so as to be the smallest and more appropriate value than the gap between the guide vane 5 and the lower surface of the upper cover 3. .

Since the U-shaped packing 16 is provided and sealed at the insertion portion of the guide vane 5 into the upper cover 3 of the upper spindle 5b, the water pressure from above is applied to the inner surface of the guide vane seat 14. Never take place, while the lower spindle
5a is inserted into the recess 10 of the lower cover 4 so that the water pressure of the water entering the recess 10 causes the lower spindle
5a is subjected to upward thrust compression. Therefore, a thrust force acts on the guide vanes 5 upward during the operation of the turbine.

When the guide vane 5 moves up in this way, the guide vane collar 5d first comes into contact with the thrust collar 23, and the thrust collar 23 receives a thrust force and prevents further movement.

In this case, if the material of the guide vane 5 is stainless steel and the material of the thrust collar 23 is gunmetal, there is a difference in hardness between the two, so that no galling occurs.

The case where the present invention is applied to the rigid shaft type turbine is described above, but it is needless to say that the present invention can be applied to not only the rigid shaft type but also the horizontal axis type turbine.

[Effect of the invention]

As described above, in the present invention, the thrust collar is provided on the lower surface of the rigid shaft type water turbine upper cover or on the side of the outer rear cover of the horizontal shaft type water turbine facing the guide vane collar, so that the conventional method is used. There is no need to mount a thrust collar on the upper spindle, so that a guide vane holding plate, bolts and nuts for mounting the guide vane holding plate are not required, and a thrust bearing is not required, so that the number of parts can be reduced.
Further, since the guide vane arm can be fixed to an arbitrary position on the upper spindle, there is an effect that there is no need to particularly control the dimensions at the design stage.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing the configuration of the guide vane thrust receiving device of the present invention, FIG. 2 is a diagram showing the configuration of a general water turbine,
FIG. 3 is a longitudinal sectional view showing a conventional guide vane thrust receiving device. 3 Upper cover, 5 Guide vane, 5b Upper spindle, 5d Guide vane flange, 13 Stepped hole, 14
… Guide vane seat, 23 …… thrust color.

Claims (1)

(57) [Scope of request for utility model registration] An upper spindle insertion hole of a guide vane formed in a water turbine cover is formed as a stepped hole, and a bottom surface of the large diameter recess formed by the stepped hole is opposed to an end surface of the guide vane flange. A thrust collar for receiving a thrust force applied to the guide vanes during operation of the turbine. A guide vane last receiving device for a turbine.