JP3372293B2 - Variable pump vane - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a variable device of a pump blade applied to a circulating water pump or the like in a power plant. [0002] Conventionally, a variable mechanism of a pump used for a circulating water pump or the like in a power plant includes an adjusting rod for opening and closing a pump blade via a link mechanism in a hollow pump main shaft in an axial direction. And the adjusting rod is reciprocally oscillated by a lever connected to the thrust bearing and the cotter via the thrust bearing to open and close the pump blade. [0003] As described above, in the conventional variable mechanism of the pump blade, the adjusting blade for opening and closing the pump blade is reciprocated by the lever to open and close the pump blade. Since the fulcrum of the lever is away from the pump main shaft, the displacement in the direction perpendicular to the pump main shaft caused by the reciprocating motion of the lever is absorbed by the slider. For this reason, the reciprocating motion of the adjusting rod becomes stair-like due to the contact friction between the adjusting rod and the slider, which is not performed smoothly, and a hysteresis phenomenon is easily caused when the pump blade is opened and closed. Further, a rotation preventing mechanism for the thrust bearing must be installed, which increases the cost. SUMMARY OF THE INVENTION [0004] An object of the present invention is to provide a pump vane variable device which is mounted inside a pump main shaft to advance and retreat in the axial direction to open and close the pump vane. A pump blade variable device that pivots an adjusting rod to be performed by a thrust bearing provided outside the pump main shaft and moves the adjusting rod forward and backward by a lever via the thrust bearing to open and close the pump blade. A thrust disk fitted movably in the axial direction on the outer periphery of the thrust bearing and connecting the adjusting rod and the thrust bearing; and a bearing support provided outside the pump main shaft and connecting the lever and the thrust bearing. It is characterized by the following configuration. [0005] That is, in the pump vane variable device according to the present invention, a thrust thruster is provided inside the pump main shaft, and is provided outside the pump main shaft with an adjusting rod that moves in the axial direction to open and close the pump blade. A thrust disk is fitted on the outer periphery of the pump main shaft in a pump blade opening / closing device that pivots on a bearing to move the adjustment rod through a thrust bearing by a lever to open and close the pump blade. A thrust bearing is connected to the thrust bearing, and a bearing support is provided outside the pump main shaft to connect the lever and the thrust bearing.A thrust disk, a thrust bearing, The shift in the direction perpendicular to the pump main shaft caused by the reciprocating motion of the lever connected by a link mechanism such as a bearing support is absorbed by these link mechanisms. I have. FIG. 1 and FIG. 2 are explanatory views of a variable mechanism of a pump blade according to an embodiment of the present invention. In the figure, the variable mechanism of the pump blade according to the present embodiment is used for a circulating water pump or the like in a power plant, and is mounted in a motor support 21 fixed to a casing cover 18 as shown in FIG. I have. A bearing box 10 is fixed to an upper surface of a support 17 that supports the variable mechanism A of the pump blade, and the pump main shaft 1 extends vertically through the inside of the support, and a lower surface of the support 17 is provided at an upper part of the pump. Casing cover 1
8 is fixed. A motor-side shaft coupling 20 is mounted on the upper surface of the pump-side shaft coupling 5 via a bearing 19. The upper part of the pump main shaft 1 is hollow,
An adjusting rod 2 for opening and closing the pump blade via a link mechanism is fitted in the hollow portion so as to be able to advance and retreat. A disk 3 is fixed to the upper end of the adjusting rod 2, and a transmission rod 4 is attached to an end of the disk 3. The transmission rod 4 passes through a shaft coupling 5 on the pump side and is screwed to a lower thrust disk 6. ing.
The thrust disk 6 is fitted to a thrust bearing 13 that supports the adjusting rod 2 for opening and closing the pump blade. Lever 7
Is pivotally attached to two lever supports 8 which are bifurcated and fixed to the upper surface of the bearing box 10 and are attached to a thrust bearing case 14 via a plate-shaped bearing support 22 as shown in FIG. Are pivotally connected. The other end of the lever 7 is pivotally attached to a lower end of a swinging rod 11 connected to a control motor 12 fixed to an upper surface of a cover 9 of the bearing box 10 fixed above the bearing box 10. The lower end surface of the thrust disk 6 is supported by a thrust bearing case 14 via a thrust bearing 13. The thrust bearing case 14 is slidably fitted on the inner peripheral surface of a support cylinder 15 formed inside the bearing housing 10 and containing lubricating oil on its outer peripheral surface. Further, a stopper bolt 16 for restricting and adjusting the swinging motion of the lever 7 is screwed and protruded from the upper surface of the bearing housing 10. As described above, the variable mechanism A of the pump blade comprises a disk 3 fixed to the upper end of an adjusting rod 2 for opening and closing the pump blade, which is fitted into a hollow portion above the pump main shaft 1, and a thrust bearing 13 , A thrust bearing device including a bearing housing 10 containing a thrust bearing case 14, a support cylinder 15, etc., and a cover 9 of the bearing housing 10, etc., are connected by a transmission rod 4, a thrust disk 6, and the like. The lever 7 having one end pivotally attached to the lever support 8 is supported by the upper end of the swinging rod 11 pivotally attached to the other end. It swings up and down following the movement of the axis of the control motor 12 attached to the cover 9 of the box 10.
At this time, even if the lever 7 is lowered, it is stopped by the stopper bolt 16 screwed to the bearing box 10. The adjusting rod 2 for opening and closing the pump blades slides up and down according to the swinging movement of the lever 7. In the conventional pump vane variable mechanism, since the fulcrum of the lever for reciprocating the adjusting rod for opening and closing the pump vane is away from the pump main shaft, the displacement in the direction perpendicular to the pump main shaft caused by the reciprocating motion of the lever. Is absorbed by the slider. For this reason, the reciprocating motion of the adjusting rod becomes stair-like due to the contact friction between the adjusting rod and the slider, and is not smoothly performed, and a hysteresis phenomenon is easily caused when the pump blade is opened and closed. In addition, the rotation prevention mechanism of the thrust bearing must be installed, which increases the cost. However, in the variable mechanism A of the pump blade, the adjustment rod 2 is connected to the disc 3, the transmission rod 4, the thrust disk 6, and the like. The thrust bearing 13 is connected to the thrust bearing case 14 via a plate-shaped bearing support 22 so that the operation is performed by the lever 7. The displacement is absorbed by these link mechanisms, and the reciprocating motion of the adjusting rod 2 for opening and closing the pump blades is performed extremely smoothly, so that the pump blades open and close smoothly. Further, when the pump blades are opened and closed, the position of the thrust bearing 13 changes linearly, and the hysteresis phenomenon is eliminated. Also, there is no need to particularly mount a rotation preventing mechanism for the thrust bearing, so that the work is easy, the power for opening and closing the pump blade is reduced, the weight is reduced, and the cost is reduced. The variable device for the pump blade according to the present invention is configured as described above, and the link between the adjusting rod and the lever for opening and closing the pump blade is connected by a thrust disk, a thrust bearing, a bearing support, or the like. Because of the connection by the mechanism, the reciprocating motion of the adjusting rod is performed smoothly, and the hysteresis phenomenon when opening and closing the pump blade is eliminated. Further, there is no need to particularly mount a rotation preventing mechanism for the thrust bearing, so that the work is facilitated and the cost is reduced.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a vertical sectional view of a variable mechanism of a pump blade according to one embodiment of the present invention. FIG. 2A is a sectional view taken along a line aa in FIG. 1;
(B) is a bb cross-sectional view in FIG. [Description of Signs] A Variable mechanism of pump blade 1 Main shaft 2 Blade opening / closing adjustment valve 3 Disk 4 Transmission rod 5 Shaft coupling 6 Thrust disk 7 Lever 8 Lever support stand 9 Bearing box cover 10 Bearing box 11 Swing rod 12 Control motor 13 Thrust bearing 14 Thrust bearing case 15 Support cylinder 16 Stopper bolt 17 Support base 18 Casing cover 19 Bearing 20 Shaft coupling 21 Motor support base 22 Bearing support

Claims (1)

(57) [Claims 1] An adjusting rod mounted inside a pump main shaft and reciprocating in an axial direction to open and close a pump blade is pivotally supported by a thrust bearing provided outside the pump main shaft. A pump vane variable device that opens and closes the pump blade by moving the adjustment rod forward and backward by a lever through the thrust bearing, wherein the adjustment rod and the thrust are fitted to the outer periphery of the pump main shaft so as to be movable in the axial direction. A thrust disc connecting the bearing,
A variable device for a pump blade, comprising: a bearing support for connecting the lever and the thrust bearing outside the pump main shaft.