JPH07229466A - Hydraulic machinery - Google Patents

Abstract

PURPOSE:To avoid any nonconformity that a main shaft and a thrust bearing are worn out, or this thrust bearing becomes strained and so on. CONSTITUTION:A ball screw 4 converting turning effort into reciprocating motion is connected to an operating rod 2 in hydraulic machinery, which makes this operating rod 2 installed in a main shaft advance or retreat and alters the angle of a runner vane connected to this rod 2, and then ball screw 4 is constituted so as to be rotated from the outside of the main shaft.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hydraulic machine having a movable runner vane for output control such as an S-type tubular turbine.

[0002]

2 and 3 are explanatory views of an S-type tubular turbine having a movable runner vane for output control.
In the figure, in general, an S-type tubular turbine often has a driven machine such as a generator 11 installed outside the running water channel. For this reason, the suction pipe 12 is bent into an S-shape, and the water suction pipe 12 is bent into an S-shaped tubular turbine. The main shaft 13 of the water turbine penetrates and is connected to the generator 11. The runner vane 14 has a variable vane angle for output control, and the operating device 15 of the runner vane 14 is also provided outside the flowing water channel together with the generator 11. The operating device 15 of the runner vane 14 is the main shaft 2
Operation rod 2 of runner vane 14 incorporated in
A thrust bearing 24 that slides on the main shaft 23 by using a stem bolt 22 is provided at the end of 1.
4 is moved by the electric servomotor 26 using the link mechanism 25, the link mechanism 25 is moved, the thrust bearing 24 slides in the direction indicated by the arrow, and the operating rod 21 is moved in the axial direction indicated by the arrow to move the crosshead 2 at the tip.
A reciprocating motion is given to 7 to operate the angle of the runner vane 14.

[0003]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention
In the tubular tubular turbine, the thrust bearing 24 of the operating device 15 of the runner vane 14 slides and slides on the main shaft 23 so that the main shaft 23 and the thrust bearing 24 are worn or the link mechanism 25 is used. Also, the thrust bearing 24 may be distorted because the electric servomotor 26 is not uniaxial. Also, the operating device 15 of the runner vane 14 is complicated to adjust due to the large number of parts, and is larger than the size of the S-shaped tubular turbine main body.

[0004]

SUMMARY OF THE INVENTION A hydraulic machine according to the present invention aims to solve the above-mentioned problems, and advances and retracts an operating rod mounted in a main shaft to change the angle of a runner vane connected to the operating rod. The hydraulic machine is characterized in that it is provided with a ball screw connected to the operation rod for converting a rotational force into a reciprocating motion, and means for rotating the ball screw from the outside of the main shaft.

[0005]

That is, in the hydraulic machine according to the present invention, the rotational force is converted into the reciprocating motion of the operating rod in the hydraulic machine for advancing and retracting the operating rod mounted in the main shaft to change the angle of the runner vane connected to the operating rod. The ball screw is connected to rotate the ball screw from the outside of the main shaft, and by rotating the ball screw from the outside of the main shaft, the rotational force is converted into reciprocating motion of the operating rod by the ball screw and the runner vane The angle changes. By connecting the ball screw to the operation rod as the runner vane operating device in this manner, it is possible to replace the conventional runner vane operating device such as a thrust bearing.

[0006]

1 is an explanatory view of an S-shaped tubular turbine according to an embodiment of the present invention. In the figure, S according to the present embodiment
Type tubular turbines have a movable runner vane for output control, and in general, S type tubular turbines often have a generator or other driven equipment installed outside the running water channel. The main shaft of the S-type tubular turbine penetrates this water absorption pipe and is connected to the generator. The runner vane has a variable vane angle for output control, and the operating device of the runner vane is also provided outside the running water channel together with the generator. A runner vane is attached to the tip of the operation rod 2 via a crosshead (not shown). However, the runner vane operating device in this S-type tubular turbine is the operation rod 2 in the main shaft 1 as shown in the figure.
A ball screw and a nut 4, a leaf spring, a shock absorber 5, a planetary gear speed reducer 6 and the like, which are sequentially wrapped in an inner cylinder 3, are incorporated in the end portion on the side opposite to the runner vane. A driven shaft 7 of the speed reducer 6 communicates with the outside of the main shaft 1 and is connected to a drive shaft of an electric motor 8 via a clutch device 9. In addition,
Commercially available off-the-shelf products are used for the ball screw and nut 4, the shock absorber 5, the speed reducer 6, the clutch device 9, the electric motor 8, and the like. By giving the ball screw relative rotation with respect to the main shaft 1 from the outside of the main shaft 1 by the electric motor 8, the ball screw can change its rotational force into reciprocating motion of the operating rod 2.

As described above, in this S-type tubular turbine, the operating device of the runner vane is composed of the operating rod 2, the ball screw and nut 4, the shock absorber 5, the speed reducer 6, the clutch device 9 and the electric motor 8 which are assembled on one axis. The structure is such that from the outside of the main shaft 1 to the ball screw with the electric motor
The ball screw can be operated to change from a rotational movement to a reciprocating movement by imparting a relative rotation to. The rotation speed of the electric motor 8 changes although the relative speed with respect to the main shaft 1 changes and the reciprocating speed of the operating rod 2 changes as the rotation direction of the electric motor 8 rotates in the normal direction or reverse direction with respect to the rotation direction of the main shaft 1. Since it is several times higher than the rotation speed of the main shaft 1, no particular problem occurs. Further, a planetary gear is used for the speed reducer 6 and is assembled on one axis, so that it functions smoothly.

In the conventional S-type tubular turbine, the thrust bearing of the runner vane operating device slides and slides on the spindle to wear the spindle and the thrust bearing, or use a link mechanism, In addition, the thrust bearing may be distorted because the electric servomotor is not uniaxial. In addition, the operation device of the runner vane is complicated to adjust due to the large number of parts, and
Although it is larger than the size of the S-type tubular turbine main body, in order to eliminate these problems in this S-type tubular turbine, a ball screw and a nut 4, in order at the end of the main rod 1 on the side opposite to the runner vane of the operating rod 2, A shock absorber 5 in which a leaf spring or the like is mounted in the inner cylinder 3, a speed reducer 6 using a planetary gear, and the like are incorporated, and a driven shaft 7 of the speed reducer 6 is communicated with the outside of the main shaft 1 to drive the driven shaft 7 of the speed reducer 6. And a drive shaft of the electric motor 8 are connected via a clutch device 9,
By installing the ball screw and nut 4 in the main shaft 1, the thrust bearing can be omitted, and wear of the bearing,
Alternatively, it is possible to avoid a defect that causes distortion due to the link mechanism. Further, the ball screw and nut 4, the shock absorber 5, the speed reducer 6, the clutch device 9 and the like can be arranged on one axis. Also, the ball screw and nut 4,
The shock absorber 5, the speed reducer 6, the clutch device 9, the electric motor 8, and the like can all be configured by commercially available off-the-shelf products. As a result, the number of parts of the runner vane operating device is reduced and the runner vane operating device becomes compact. Adjustment and operation become easy. Cost is reduced.

[0009]

The hydraulic machine according to the present invention is constructed as described above, and by replacing the conventional runner vane operating device such as a thrust bearing by connecting a ball screw to the operating rod as the runner vane operating device. Therefore, it is possible to avoid problems such as wear of the main shaft and the thrust bearing, or distortion of the thrust bearing due to the link mechanism. In addition, the ball screw or a rotating device for rotating the ball screw can be configured with all commercially available off-the-shelf items, and the number of parts is reduced and the size is reduced as compared with the conventional runner vane operating device in a hydraulic machine. There are effects such as ease and cost reduction.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of an operating device for a runner vane in an S-shaped tubular turbine according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of a conventional S-shaped tubular turbine.

FIG. 3 is a sectional view of an operating device for a runner vane in the S-type tubular turbine.

[Explanation of symbols]

 1 Spindle 2 Operating Rod 3 Inner Cylinder 4 Ball Screw and Nut 5 Shock Absorber 6 Reduction Gear 7 Driven Shaft of Reduction Gear 8 Electric Motor 9 Clutch Device

Claims (1)

[Claims] 1. A hydraulic machine for advancing and retracting an operating rod mounted in a main shaft to change an angle of a runner vane connected to the operating rod, the ball screw being connected to the operating rod and converting rotational force into reciprocating motion. And a means for rotating the ball screw from the outside of the main shaft, the hydraulic machine.