JPS58109717A - Segment bearing adjustment device - Google Patents

Abstract

PURPOSE:To prevent the bearing gap value from becoming larger after running by a structure wherein an adjusting cap, an adjusting liner and a member to support the adjusting cap to a plummer block are employed in order to fix a segment bearing supporting a main shaft to the plummer block. CONSTITUTION:A flat plate adjusting liner 10 is adhered between the plummer block 4 and the enlarged contact surface of the adjusting cap 9 contactingly mounted on the back of the segment bearing 3. The adjustment of bearing gap (g) is performed with the adjusting liner 10 while the bearing load is transmitted from the back of the adjusting cap 9 through the adusting liner 10 to the plummer block 4. Accordingly, a conventional adjusting bolt for gap adjustment and transmission of bearing load is eliminated, resulting in preventing the gap value from becoming larger due to the tilt of screw thread, collaspe of flank of thread and the like of the adjusting bolt.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a segment bearing adjustment device for a water turbine and a pump water turbine.

FIG. 1 shows a sectional view of a conventional segment bearing adjustment device in an installed state, where 1 is a runner, 2 is a main shaft in an upright position with the runner 1 fixed, and 3 is a segment bearing.

4 is a bearing stand. As shown in FIGS. 2 and 3, the main shaft 2 is rotated toward the center via a screw bush 7 attached to a bearing stand 4K) and an adjustment bolt 5 screwed into the screw bush 7 and fixed via an adjustment nut 6. The main shaft 2 is held by a plurality of segment bearings 3 disposed circumferentially around the outer periphery of the main shaft 2, which are each pressed. Reference numeral 8 indicates a nut rotation stopper for the ll adjustment nut 6, 1g indicates a gap provided between the main shaft 2 and the segment bearing 3, which is required when the main shaft 2 rotates, and 12, indicated by a two-dot chain line, indicates a white metal attachment position.

In the bearing adjustment device shown in Fig. 1, the load from the segment bearing 3 is transmitted to the bearing stand 4 by receiving the thread surface 1 of the adjustment bolt 5. with the bearing gap value adjusted before operation.

There was a drawback that the gap value after operation changed significantly. Also, lI! The thread of bolt 5 uses a fine thread to control the minute bearing gap and prevent the gap value from changing due to play in the thread. There was a drawback that it was easy to cause a phenomenon of jamming with the screw bushing 7.

The present invention has been made in view of the above situation.

It is an object of the present invention to provide a segment bearing adjustment device which can reduce the number of man-hours for assembly, disassembly, and adjustment without making the bearing gap value larger after operation than before operation.

The segment bearing adjustment device of the present invention has a plurality of segments disposed in the circumferential direction to rotatably hold the main shaft by setting a predetermined gap between the main shaft of a horizontal pump water turbine in an upright position and the radial direction of the outer periphery of the main shaft. an adjustment cap that contacts the outer station of each segment bearing, an adjustment liner that is clamped between the adjustment cap and the bearing pedestal, and a member that supports the adjustment cap on the bearing pedestal. is a friend.

Hereinafter, an embodiment of the segment bearing adjustment device of the present invention will be described with reference to FIG.
This will be explained with reference to FIG. Reference numeral 9 denotes an adjustment cap attached in contact with the back surface of the segment bearing 3, and a flat adjustment liner 10 is clamped between the enlarged contact surface of the vI4 adjustment cap 9 and the bearing stand 4. Numeral 11 is a bolt that is a member that supports the adjustment cap 9 on the bearing stand 4. Then, the thickness of the adjusting liner 10 can be selected by setting the segment bearing 3 in contact with the main shaft 2 with no gap in FIG. i1
1. Measure the size of the gap between the cap 9 and the segment bearing 3. The value obtained by subtracting the gap g to be formed between the main shaft 2 and the segment bearing 3 from this dimension is the thickness of the adjustment liner IO.

The adjustment of the bearing gap g is performed by the adjustment liner 10, and the bearing load is transmitted from the back surface of the adjustment cap 9 to the bearing stand 4 via the flat adjustment liner 10. Therefore, the conventional adjustment bolt 5 for gap adjustment and bearing load transmission is no longer necessary, and the gap value is determined from the adjustment value before operation after the machine is operated due to the screw thread of the 8# adjustment bolt 5 falling or the thread surface being bent. This can eliminate the phenomenon of increasing size.

This eliminates the possibility of the screw thread becoming jammed during assembly, disassembly, and adjustment. There is no need for TFC, threaded bushes, or adjustment nuts, reducing the number of parts and eliminating the need for large-diameter thread cutting, reducing the number of man-hours.

In this way, the segment bearing adjustment device of this embodiment fixes the segment bearing that supports the main shaft to the bearing pedestal by using an adjustment cap that is in contact with the outer periphery of the segment bearing, and an adjustment that is clamped between the adjustment cap and the bearing pedestal. Raina and lI4
Since we use a member that supports the adjustment cap on the bearing stand and do not use the threaded part as in the conventional case, changes in the bearing gap value due to falling of the screw thread, loosening of the thread surface, etc., i.e., larger after operation than before operation This reduces the number of parts per unit, and facilitates assembly, disassembly, and adjustment, and reduces the number of man-hours required for each operation.

As described above, the segment bearing adjustment device of the present invention has the following features:
This has the effect that the bearing gap value does not become larger after operation than before operation, and the assembly, disassembly, and adjustment operations become easier and the number of man-hours required for each operation can be reduced.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional view of a conventional segment bearing adjustment device installed, Figure 2 is a detailed view of part A in Figure 1, Figure 3 is a cross-sectional view of part B in Figure 2, and Figure 4 is a cross-sectional view of part B in Figure 2. A cross-sectional view of the same part as Fig. 2 of the embodiment of the segment bearing adjustment device of the invention, @S is Fig. 4
FIG. 3 is a cross-sectional view of section C in the figure. 2...Main shaft, 3...Segment bearing, 4...Bearing stand, 9...Adjustment cap, 10...Adjustment liner, 1
1...Bolt, g...Gap.

Claims (1)

[Claims] 1. The main shaft of a water turbine or pump water turbine in an upright position, and a plurality of companion segment bearings arranged in the circumferential direction that rotatably hold the main shaft with a predetermined gap in the radial direction of the outer circumference of the main shaft; an adjustment cap in contact with the outer circumference of the segment bearing;
A segment bearing adjustment device comprising: an adjustment liner sandwiched between the adjustment cap and the bearing pedestal; and a member supporting the adjustment cap on the bearing pedestal.