JPH0898476A - Moving unit for centering stator - Google Patents

Abstract

PURPOSE: To move a stator with a relatively small external force by reducing the frictional force between the stator and a stator base. CONSTITUTION: Steel rods are arranged vertically in two layers 9A, 9B within a steel box 8 having a frame mounted on a concrete foundation 3. The upper rod layer 9A is arranged perpendicularly to the lower rod layer 9B. A jack 6 is set on the upper steel rod layer 9A. The jack 6 supports a stator 1 such that the leg part 7 thereof is floated slightly (g) from a stator base 2. The stator 1 can be moved with a small external force because at the rolling friction of the rod layers 9A, 9B.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stator centering moving device, and more particularly to a stator centering moving device used for centering a stator for a vertical axis rotating electric machine such as a water turbine generator.

[0002]

2. Description of the Related Art In general, a stator for a vertical rotating electric machine such as a turbine generator is separately manufactured and integrally assembled in a circular shape at a site of a hydroelectric power plant for transportation, and the circularity of a stator inner diameter is adjusted and adjusted. After that, it is hung by a crane and temporarily placed on a stator base provided on the concrete foundation, and then centered by a jack.

FIG. 5 shows a conventional moving device for stator centering, in which a stator 1 is temporarily placed on a stator base 2. These stator bases 2 are embedded at positions on the circumference of a concrete foundation body 3, and in this concrete foundation body 3, the stator 1 and the concrete outer wall 4 are located outside the stator 1. The column 5 is installed between and. A high-power jack 6 is attached to the column 5, and the jack 6 presses the outer surface of the stator 1 to slide the stator 1 with respect to the stator base 2. In this way, the centering work for aligning the center of the stator 1 with the center of the vertical rotating electric machine by the high-power jack 6 is performed.

[0004]

However, the above-mentioned conventional moving device for centering the stator moves the stator temporarily placed on the base for the stator, and therefore the base for the stator and the stator are not connected to each other. There is a very large frictional force between them, therefore, a large jack with high output must be used, and the column that receives the reaction force of the jack must be a solid structure, which increases the cost. And there was a problem of securing a large space.

Further, since the jack applies a large external force to the outer surface of the stator to overcome the above-mentioned large frictional force, the stator is deformed by this external force, and the circularity of the inner diameter of the stator collapses. There is also a problem that vibration of the stator and shaft run-out of the rotating part shaft may be caused due to poor rotation.

Therefore, an object of the present invention is to provide a moving device for stator centering which reduces the frictional force between the stator and the base for the stator and enables the movement of the stator with a relatively small external force. It is in.

[0007]

In order to achieve this object, the present invention relates to a stator of a vertical axis electric machine mounted on a stator base installed on a base body with respect to the stator base. In a moving device for moving a center of a stator, a jack placed on the base body and supporting the stator so as to float from the base, a space between the base body and the jack, the jack and the stator. And a friction reducer for reducing the frictional force when moving the stator with respect to the base body for centering the stator. It is what

In such a structure, the friction reducing member is interposed between the base member and the jack, and the box with the frame placed on the base member and the inside of the box with the frame member are placed. It is preferable that the round bar row of two layers are housed in the same and are arranged in the vertical direction.

Further, the friction reducing body is interposed between the base body and the jack, and the box with a frame placed on the base body and a plurality of steels housed in the box with the frame. It is preferably composed of a sphere.

It is desirable that the friction reducing member is a lubricant such as tetrafluororesin having a small friction coefficient, which is interposed between the jack and the stator.

[0011]

[Function] An external force for centering is applied to the stator while the jack supports the stator so as to float above the stator base. Since the friction reducing body exists between the stator and the base body, the stator moves by a relatively small external force.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of a moving device for stator centering according to the present invention will be described below with reference to FIGS. 1 to 4 in which the same parts as those in FIG.

1 and 2, the stator 1 has a plurality of legs 7 projecting downward from a bottom surface 1a thereof. The stator 1 has the legs 7 positioned on a base 2 for the stator. To be positioned. These stator bases 2 are embedded at positions on the circumference of the concrete base body 3.

A steel box 8 with a frame is placed on the concrete base body 3 between the adjacent stator bases 2, and inside the box 8, two rows of upper and lower steel round bars 9A, 9B is housed. The lower steel round bar row 9B is composed of a plurality of steel round bar rows juxtaposed in one direction, and the upper layer steel round bar row 9A.
Is composed of a plurality of steel round bars arranged in a direction perpendicular to the direction of arrangement of the round bar row 9B. Thus, the upper and lower round bars 9A and 9B are laminated in a cross shape when viewed from above. Further, the jack 6 is placed on the upper round steel rod row 9A.

Next, the operation of the first embodiment will be described.

A steel box 8 with a frame is placed on the concrete base body 3, and the jack 6 is placed on the round rod rows 9A and 9B in the steel box 8. As shown in FIG. 2, the jack 6 has its ceiling so that when the stator 1 is placed on the jack 6, a slight gap g exists between the stator base 2 and the leg portion 7. The edge position is adjusted. After this adjustment, the stator 1 is placed on the jack 6 by the crane.

Thus, the stator 1 is supported by the jacks 6 so that the leg portions 7 thereof are slightly floated from the stator base 2. When an external force is applied to the stator 1 in this state, the jack 6 slides on the upper and lower round bars 9A and 9B,
The stator 1 is moved and centering is performed. At this time, the friction between the stator 1 and the concrete foundation 3 is
The rolling friction of the round bars 9A and 9B results in a very small value.

Therefore, the external force required to move the stator 1 is
Compared to the sliding movement of the conventional moving device for stator centering, the moving amount is reduced to about 1/30 to 1/100, so that the stator 1 can be moved by the human power of several people.

FIG. 3 shows a second embodiment of the present invention, in which a plurality of steel balls 10 are used instead of the upper and lower round bars 9A and 9B. Other configurations and operations are the same as those of the first embodiment.

The steel box 8 with a frame accommodating the round bars 9A and 9B and the steel balls 10 is interposed between the concrete foundation 3 and the jack 6 in the above-mentioned first and second embodiments. However, it may be interposed between the jack 6 and the stator 1.

In the above first and second embodiments, in order to reduce the frictional force between the stator 1 and the concrete foundation 3, the round bars 9A and 9B which rotate with the movement of the stator 1 and A rolling element such as the steel ball 10 was used. Next, an embodiment in which it is not necessary to use such a rolling element will be described.

FIG. 4 shows a third embodiment of the present invention, in which the jack 6 is placed directly on the concrete foundation body 3. Between the top end of the jack 6 and the bottom surface 1a of the stator 1, a lubricant 1 such as tetrafluorocarbon resin having an extremely small friction coefficient is formed.
1 is interposed.

The movement of the stator 1 is carried out under a very small frictional force due to the presence of the lubricant 11. The use of such a lubricant 11 is particularly effective when the weight of the stator 1 is relatively small.

[0024]

As is apparent from the above description, according to the present invention, the jack supports the stator so that the stator floats above the base for the stator, and the friction reducer reduces the friction between the base body and the stator. In order to reduce the force, it is possible to move the stator with very little force.

Therefore, there is no problem such as increase in cost and securing of space due to the installation of strong columns such as the conventional moving device for stator centering, and the moving device for stator centering in the related art. There is no problem such as collapse of the circularity of the inner diameter of the stator due to such a large external force.

[Brief description of drawings]

FIG. 1 is a partial sectional view schematically showing a first embodiment of a moving device for stator centering according to the present invention.

FIG. 2 is a front view taken along the line II of FIG.

FIG. 3 is a partial sectional view schematically showing a second embodiment of the moving device for the stator centering according to the present invention.

FIG. 4 is a partial cross-sectional view schematically showing a third embodiment of a moving device for stator centering according to the present invention.

FIG. 5 is a partial cross-sectional view schematically showing a conventional moving device for stator centering.

[Explanation of symbols]

 1 Stator 2 Base for Stator 3 Concrete Foundation 6 Jack 9 Round Bar 10 Steel Ball 11 Lubricant

Claims (4)

[Claims] 1. A moving device for centering a stator, which moves a stator of a vertical axis rotating electric machine mounted on a stator base installed on a base body with respect to the base, and is mounted on the base body. , A jack that supports the stator so as to be floated from the stator base, and at least one of between the base body and the jack and between the jack and the stator, A stator centering moving device, comprising: a friction reducing body that reduces a frictional force when the stator is moved with respect to the base body for centering the child. 2. The friction reducing body is interposed between the base body and the jack, and is housed in the box with the frame mounted on the base body and housed in the box with the frame and is perpendicular to each other. 2. The moving device for stator centering according to claim 1, wherein the moving device is for two rows of round rods arranged. 3. The friction reducing body is interposed between the base body and the jack, and has a box with a frame placed on the base body and a plurality of steels housed in the box with the frame. The stator centering moving device according to claim 1, wherein the moving device is a ball. 4. The friction reducing body is a lubricant such as tetrafluororesin having a small coefficient of friction, which is interposed between the jack and the stator. Moving device for stator centering.