JP2985481B2 - Vertical and horizontal moving device for rotor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for inspecting a bearing for supporting a rotor, particularly a rotor of a steam turbine, in which the rotor is moved up and down in order to remove the bearing. The present invention relates to an apparatus for moving a rotor vertically and horizontally to arrange a bearing so as to come to a position.

[0002]

2. Description of the Related Art FIG. 5 shows a known structure in which a rotor such as a steam turbine is supported by bearings. In FIG. 5, the rotor 1 is connected to another rotor 11 by couplings 1a and 11a, and the rotor 1 is connected to the upper half bearing 3 and the lower half bearing 4 with the shaft neck 2 by fastening means (not shown). Supported by the bearing 5.

A bearing 5 is mounted on a bearing support 7 of a bearing base 6 with a spherical projection 4a of a lower half bearing 4 mounted on a spherical seat 7a of a bearing support 7 provided on a box-shaped bearing base 6. . 8
Is a bearing presser for holding the bearing 5, and 10 is an oil drainer for draining oil from the bearing 5. The bearing stand cover 12 covers the opening of the box-shaped bearing stand 6 and is connected to the bearing stand 6 at a flange portion (not shown) to form a bearing box. Reference numeral 13 denotes an oil drain.

[0004] With such a structure, the rotor 1 is mounted on the bearing 5.
However, after the operation for a predetermined period or when the turbine is abnormal, the operation is stopped and the bearing 5 is inspected. Next, an inspection method of the bearing will be described. The bearing base cover 12 is removed from the bearing base 6, the bearing retainer 8 is further removed, and the upper half bearing 3 is removed from the lower half bearing 4 by loosening the fastening means. Then, the support 15 is attached to the flange 6a of the bearing base 6 as shown in FIG.

Here, the supporting member 15 is an inverted U-shaped arm 16.
A semicircular rotor support 18 covering the lower half of the coupling 1 a of the rotor 1, screwed into open ends on both sides of the rotor support 18, penetrating the arm 16, and And a stud 20 provided so that the height of the arm 16 can be adjusted. The flanges 16 a at the open ends on both sides of the arm 16 are fastened to the flange 6 a of the bearing base 6 by bolts 21.

An adjusting bolt 22 for adjusting the horizontal position of the rotor 1 is screwed to the rotor support 18 between the open ends on both sides of the rotor support 18 and the arm 16. I have. Such a support 1
After removing the upper half bearing 3 as described above, the rotor 1
At the position of the flange 6a of the bearing base 6 corresponding to the position of the coupling 1a. At this time, the arm 1 of the support 15
6 with the flanges 16a on both sides of the
a with bolts 21. Next, the rotor support 18 is installed so as to cover the lower half of the coupling 1a of the rotor 1, a stud 20 penetrating the arm 16 is screwed into the open end of the rotor support 18, and the rotor support 18 is connected to the stud 2
It is supported on the arm 16 by a nut 19 screwed to the stud 20 via the “0”. Then, by rotating the nut 19 to raise the rotor support 18 via the stud 20, the rotor support 18 comes into contact with the coupling 1 a, and then lifts the rotor 1 to move the rotor 1 between the shaft neck 2 and the lower half bearing 4. Create a gap. By this gap, the lower half bearing 4 can be removed by sliding the spherical seat 7a of the bearing support 7 along the shaft neck 2. Therefore, the bearing metals of the upper and lower half bearings 3 and 4 can be inspected.

When the bearing 5 is restored, the lower half bearing 4 is inserted between the shaft neck 2 and the bearing support 7 and installed.
The nut 19 is rotated in the reverse direction to lower the rotor support 18 supporting the rotor 1, and the shaft neck 2 of the rotor 1 is mounted on the lower half bearing 4. Then, the support 15 is removed, and the upper half bearing 3, the bearing retainer 8, and the bearing base flange 12 are attached to complete the restoration.

Further, when installing the steam turbine, it is necessary to determine the position of the bearing 5 so that the rotor 1 can be disposed at a predetermined axial position. In this case, the support 15 to which the adjustment bolt 22 is attached is attached to the flange 6a of the bearing base 6 with the bolt 21 as described above, and the vertical moving distance of the rotor 1 is adjusted by the above-described procedure. , The horizontal movement distance of the rotor 1 is adjusted.

By adjusting the moving distance in the vertical and horizontal directions, the rotor 1 is brought to a predetermined axial position.
In this state, the position of the lower half bearing 4 placed on the bearing base 6 is adjusted to install the bearing 5.

[0010]

In the above prior art, the lower half bearing 4 is taken out of the bearing base 6 in order to inspect the bearing 5 composed of the upper half bearing 3 and the lower half bearing 3 supporting the rotor 1. At this time, a support 15 for moving the rotor in the vertical direction is required, and an adjusting bolt 22 for moving the rotor in the horizontal direction when the turbine is installed is also required.

Since these jigs are transported from a storage place by an overhead crane or the like and set on the rotor and the bearing table at every inspection or at the time of installation, there is a disadvantage that it takes time to set. An object of the present invention is to move a rotor vertically and horizontally during inspection of a bearing and installation of a turbine, and a vertical and horizontal movement device for a rotor that can be set on a bearing stand without carrying jigs necessary for these movements. It is to provide.

[0012]

In order to solve the above-mentioned problems, according to the present invention, a box-shaped bearing pedestal having a flange portion at an open end and a bearing pedestal cover for covering the opening of the bearing pedestal are provided. A bearing box fastened by a part, a bearing formed by combining an upper half bearing and a lower half bearing placed on a bearing support provided on the bearing base, and a rotor supported by the bearing. In the rotor vertical moving device, which lifts the rotor to take out a bearing at the time of inspection, a portion other than a portion supported by the bearing of the rotor is placed in a lower half of the bearing box in the bearing box. A rotor support having arms protruding outward is provided at both ends of the rotor support, and the arm of the rotor support is mounted on the flange of the bearing base. Parts and bearing stand flanges It said rotor support arm portion and said flange means and said rotor supporting arm portions for fixing the assumed with a longitudinal adjustment means for adjusting the vertical distance between the flange between.

[0013] Further, a bearing box having a box-shaped bearing stand having a flange at an opening end, a bearing stand cover for covering the opening of the bearing stand, being fastened by the flange portion, and a bearing provided on the bearing stand. A rotor comprising a bearing in which an upper half bearing and a lower half bearing mounted on a support are combined, and a rotor supported by the bearing, wherein the rotor is lifted to take out the bearing during inspection. In the vertical moving device, a portion other than a portion supported by the bearing of the rotor is arranged so as to surround a lower half from below the portion other than the portion supported by the bearing of the rotor, and protrudes outward at both ends thereof. A rotor support having an arm portion is provided, and the arm portion of the rotor support is mounted on the flange of the bearing stand, and the arm portion of the rotor support and the arm are disposed between the arm portion of the rotor support and the flange of the bearing stand. Secure with flange Vertical adjustment means for adjusting the vertical distance between the step and the arm of the rotor support and the flange, and lateral adjustment means for moving the rotor support in the horizontal direction and adjusting the moving distance thereof. .

The above-mentioned vertical adjusting means includes a bolt seat provided on a flange of the bearing base, and a vertical adjusting bolt which penetrates the bolt seat into an arm portion of the rotor support and is screwed, and a tip of which is in contact therewith. Are provided. Further, the lateral direction adjusting means includes a bolt seat provided on the flange of the bearing base, a hole through which the bolt seat is inserted with a gap, and a hole through which the fixing bolt passes, and an arm portion for supporting the rotor. The spacing plate inserted between the flange of the bearing base and the flange of the bearing base where the flange does not overlap, penetrates and engages with the support plate provided on the bearing base, and its tip contacts the end face of the spacing plate. And a lateral adjustment bolt capable of moving the rotor support in the horizontal direction via the spacing plate and adjusting the moving distance.

[0015]

The rotor support has a semicircular shape surrounding the lower half of the rotor, and has arms formed by bending both open ends outward. The rotor support is mounted with the arms on both sides thereof mounted on a flange of a bearing base provided with a bearing support on which the bearing is mounted. And a longitudinal adjustment means, and as this means, a longitudinal adjustment bolt which penetrates and is screwed into the arms on both sides of the rotor support, and a tip of which is in contact with a bolt seat provided on a flange of the bearing base, is provided. , The rotor support can move up and down.

Here, by moving the rotor support upward, the rotor support is lifted by supporting the rotor on a semicircular portion. Therefore, if the upper half bearing is removed during inspection and the rotor support is lifted, a gap is created between the rotor and the lower half bearing. Therefore, the lower half bearing can be easily taken out along the rotor by sliding the bearing support surface. As a result, the upper half bearing and the lower half bearing taken out can be inspected.

When the next recovery is performed, the procedure is reversed. That is, the lower half bearing is inserted between the rotor and the bearing support and placed on the bearing support. When the vertical adjustment bolt is rotated in the opposite direction, the rotor support moves downward while supporting the rotor, and places the rotor on the lower half bearing. By further moving the rotor support downward, a gap can be provided between the rotor support and the rotor such that the rotor does not contact the rotor support during rotation of the rotor. In this state, the rotor support can be fastened and fixed to the flange of the bearing base via the arm by the fixing bolt.

Therefore, by attaching the upper half bearing and the bearing base cover in this state, the rotor can be rotated by incorporating the vertical movement device of the rotor in the bearing base. Also, at the time of installation, when the bearing is installed on the bearing base so that the rotor is located at the predetermined axis position, the rotor support is moved up and down by the above-described method, and the rotor support for supporting the rotor by the lateral adjustment means is provided. The lower half bearing is moved in the horizontal direction, and the upper and lower and horizontal positions thereof are adjusted on the bearing base so that the rotor is supported by the bearing at a predetermined axial center position of the rotor.

As the above-mentioned lateral adjustment means, a bolt seat provided on the flange of the bearing stand is inserted between the arm of the rotor support and the flange of the bearing stand where the flange of the bearing stand cover does not overlap. A spacing plate having a hole to be inserted and a hole through which the fixing bolt penetrates, and a lateral adjustment bolt that is in contact with an end surface of the spacing plate and that is screwed through a support plate provided on the bearing base. The spacing plate from which the fixing bolt is removed is moved in the horizontal direction by the adjustment bolt, and the rotor support for supporting the rotor is moved in the horizontal direction. The horizontal movement of the spacing plate is possible by the gap of the hole into which the bolt seat is inserted.

After installing the lower half bearing in this way,
Place the rotor on the lower half bearing and attach the upper half bearing. As described above, the rotor support is lowered by the vertical adjustment bolt to a position where the rotor does not come into contact with the rotor support during rotation as described above, and the arm of the rotor support is fixed via the spacing plate by the fixing bolt. Fasten to the flange of the bearing stand to fix the rotor support. The installation is completed by attaching the upper half bearing and the bearing base flange.

[0021]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 2 shows the upper and lower portions of the rotor according to the embodiment of the present invention.
FIG. 1 is a cross-sectional view taken along the line AA of FIG. 2, which is provided with a horizontal moving device and supports the rotor. FIG. Shows the state at the time of movement. FIG. 3 is a view taken in the direction of arrow B shown in FIG. 1 with the bearing base cover 12 removed. 1 to 3, the same components as those in the conventional example shown in FIGS. 5 and 6 are denoted by the same reference numerals, and the description thereof will be omitted.

1 to 3 are different from the conventional example as follows. The rotor support 25 is a semicircular half ring 26 surrounding the lower half of the coupling 1a of the rotor 1.
And an arm 27 formed by bending open ends on both sides of the half ring 26 outward. The arm 27 of the rotor support 25 is placed via a spacing plate 28 on the flange 6 a of the bearing base 6 where the flange 12 a of the bearing base cover 12 does not overlap.

As shown in FIG. 4, which is a cross-sectional view taken along the line CC of FIG. 3, the spacing plate 28 is fixed to a hole 30 into which a bolt seat 29 provided on the flange 6a of the bearing base 6 is inserted with a gap. The bolt 31 is formed to have a hole 32 therethrough.
Here, the gap between the hole 30 and the bolt seat 29 has a horizontal length sufficient to move the rotor support 25 in the horizontal direction as described later.

The vertical adjustment bolt 35 penetrates and is screwed into the arm 27 of the rotor support 25, and its tip is in contact with the bolt seat 29. As shown in FIG. 4, the fixing bolt 31 screws the rotor support 25 at its arm 27 through the hole 32 of the spacing plate 28 to screw it to the flange 6a of the bearing base 6. In addition, the collar 36 is attached to the vertical adjustment bolt 35 by a detent pin 37.
Are inserted and attached to cover a part of the head of the fixing bolt 31 to prevent the fixing bolt 31 from coming out during operation of the turbine.

The lateral adjustment bolts 40 penetrate and screw into support plates 41 provided on both side surfaces of the flange 6 a of the bearing base 6, and the ends thereof are in contact with the end surfaces of the spacing plate 28.
With such a configuration, during operation of the turbine, as shown in the left half of FIG. 1, the rotor support 25 has its arm 27 attached to the flange 6a of the bearing base 6 via the spacing plate 28 as shown in FIG. A gap is formed between the rotor support 25 and the coupling 1a of the rotor 1, and a gap S is formed at the lowermost end thereof. Therefore, during operation of the turbine, the rotor 1 rotates safely without contacting the rotor support 25.

By the way, when a periodic inspection is performed or a turbine is abnormal, the turbine is stopped and the bearing is inspected. This check is performed as follows. As shown in the right half of FIG. 1, the bearing base cover 12 is removed, and then the bearing retainer 8 and the upper half bearing 3 are removed. Then, the locking pin 37 shown in FIG. 4 is pulled out to remove the collar 36, and then the fixing bolt 31 is removed to make the rotor support 25 free. In this state, if the vertical adjustment bolts 35 on both sides are rotated, the vertical adjustment bolts 35 rotate while their tips contact the bolt seat 29,
Accordingly, the rotor support 25 rises. When the coupling 1a of the rotor 1 contacts the half ring 26 of the rotor support 25, the rotor support 25 rises while supporting the rotor 1, and a gap is formed between the shaft neck 2 of the rotor 1 and the lower half bearing 4. Occurs.

When this gap is generated, the lifting of the rotor support 25 is stopped at that position. Then, the lower half bearing 4 is slid along the shaft neck 2 on the spherical seat 7a of the bearing support 7, and is taken out.
The bearing metal of the upper and lower half bearings 3, 4 taken out as described above can be checked for damage. Restoration of the bearing after the bearing inspection is completed is performed in a procedure reverse to the above procedure. That is, the lower half bearing 4 is connected to the spherical seat 7 of the bearing support 7.
a and insert it into the lower part of the shaft neck 2. After insertion, the vertical adjustment bolts 35 on both sides are rotated in the opposite direction to lower the rotor support 25. As a result, the shaft neck 2 of the rotor 1 is mounted on the lower half bearing 4. Then, the rotor support 25 is further lowered from this state, and the arm portion 27 of the rotor support 25 is moved.
Is stopped on the spacing plate 28, the descent is stopped. In this state, the rotor support 25 is fastened and fixed to the flange 6a of the bearing base 6 via the spacing plate 28 by the fixing bolt 31, and the collar 36 is attached to the vertical adjustment bolt 35 to fix the fixing bolt 31.
To prevent pulling out.

Next, the upper half bearing 3, the bearing retainer 8, and the bearing base cover 12 are attached to make the operable state. Next, a method of adjusting the position of the rotor 1 by moving the rotor 1 in the vertical and horizontal directions to install the bearing 5 so that the rotor 1 is at a predetermined axial center position when the turbine is installed will be described.

The vertical position of the rotor 1 can be adjusted by the above-described vertical adjusting bolt 35. On the other hand, in order to adjust the horizontal position of the rotor 1, as shown in FIG. It is brought into contact with the end face of the spacing plate 28 interposed therebetween. Then, by rotating the lateral adjustment bolt 40, the spacing plate 2 is rotated.
8 is pressed to move the rotor support 25 in contact therewith in the horizontal direction. When moving in the direction opposite to this direction, the lateral adjustment bolt 40 screwed to the support plate 41 on the other side is used.
The rotation can be performed.

In this way, the position of the rotor 1 is adjusted by moving the rotor 1 in the vertical and horizontal directions so that the rotor 1 comes to a predetermined axial center position. If the lower half bearing 4 is installed on the bearing base 6 in this state, the rotor 1 is supported by the lower half bearing 4 at a predetermined axial position. Then, the rotor support 25 is lowered as described above, separated from the coupling 1a of the rotor 1 and fixed with the fixing bolt 31, and the upper half bearing 3, the bearing presser 8, and the bearing base cover 12 are attached, whereby the installation is completed. I do.

[0031]

As is apparent from the above description, according to the present invention, with the above arrangement, the vertical moving device for raising and lowering the rotor during the inspection of the bearing and the rotor at the time of installation, such as the turbine, are brought to the predetermined axial positions. The vertical moving device for moving the rotor vertically and horizontally and the horizontal moving device are built in the bearing box consisting of the bearing base and the bearing base cover. There is an effect that the vertical and horizontal moving devices can be used immediately without transporting the direction moving jig, and these storage locations become unnecessary.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view taken along the line AA of FIG. 2 of a rotor unit having a device for moving the rotor vertically and horizontally according to an embodiment of the present invention. The state of is shown.

FIG. 2 is a cross-sectional view of a bearing unit that supports the rotor provided with the vertical and horizontal movement devices of the rotor of FIG. 1;

FIG. 3 is a view taken in the direction of arrow B when the bearing base cover of FIG. 1 is removed.

FIG. 4 is a view showing a state where a bearing stand cover is attached in FIG. 3;
-C sectional view

FIG. 5 is a cross-sectional view of a bearing portion that supports the rotor.

FIG. 6 is a cross-sectional view of a conventional rotor unit provided with supports for moving the rotor vertically and horizontally.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Rotor 3 Upper half bearing 4 Lower half bearing 5 Bearing 6 Bearing base 6a Flange 7 Bearing support 12 Bearing base cover 12a Flange 25 Rotor support 27 Arm part 28 Spacer plate 29 Bolt seat 31 Fixing bolt 35 Vertical adjustment bolt 40 Horizontal Direction adjustment bolt 41 Support plate

Claims (4)

(57) [Claims] 1. A bearing box comprising a box-shaped bearing base having a flange at an open end, a bearing base cover for covering an opening of the bearing base, and the bearing base being fastened by the flange, and provided on the bearing base. The bearing includes an upper half bearing and a lower half bearing mounted on a bearing support, and a rotor supported by the bearing. The rotor is lifted to take out the bearing during inspection. In the vertical moving device of the rotor, a portion other than the portion supported by the bearing of the rotor is disposed so as to surround the lower half from below the portion other than the portion supported by the bearing of the rotor, and protrudes outward at both ends. A rotor support having a bent arm portion, the arm portion of the rotor support is placed on the flange of the bearing base, and the arm portion of the rotor support is provided between the arm portion of the rotor support and the flange of the bearing base. Means for fixing to the flange Preliminary said rotor supporting vertical movement device of the rotor, characterized in that it comprises a longitudinal adjustment means for adjusting the vertical distance between the arm portion and the flange. 2. A bearing box comprising a box-shaped bearing base having a flange at an open end, a bearing base cover covering the opening of the bearing base, and the flange section fastening the bearing base, and a bearing provided on the bearing base. A rotor comprising an upper half bearing and a lower half bearing mounted on a support, and a rotor supported by the bearing, wherein the rotor is lifted to take out the bearing during inspection. In the vertical moving device, a portion other than a portion supported by the bearing of the rotor is arranged so as to surround a lower half from below the portion other than the portion supported by the bearing of the rotor, and protrudes outward at both ends thereof. A rotor support having an arm portion is provided, and the arm portion of the rotor support is mounted on the flange of the bearing stand, and the arm portion of the rotor support and the arm are disposed between the arm portion of the rotor support and the flange of the bearing stand. Means for fixing to flange And vertical adjusting means for adjusting the vertical distance between the arm portion of the rotor support and the flange, and horizontal adjusting means for moving the rotor support in the horizontal direction and adjusting the moving distance. Vertical and horizontal moving device for the rotor. 3. The apparatus according to claim 1, wherein the longitudinal adjusting means is screwed into the bolt seat provided on the flange of the bearing base through the arm portion of the rotor support. And a vertical adjustment bolt with which the tip thereof comes into contact. 4. The fixing device according to claim 2, wherein the lateral adjustment means includes a bolt seat provided on the flange of the bearing base, a hole into which the bolt seat is inserted with a gap, and the fixing bolt penetrating. A spacing plate inserted between the rotor support arm and the flange of the bearing pedestal where the flange of the bearing pedestal cover does not overlap, and threaded through a support plate attached to the bearing pedestal. The tip of the rotor contacts the end face of the spacing plate to move the rotor support through the spacing plate in the horizontal direction, and includes a lateral adjustment bolt capable of adjusting the moving distance. Horizontal moving device.