JPH0893408A - Bearing supporting apparatus - Google Patents

Abstract

PURPOSE: To lessen the number of component parts, shorten the processing and assembling time, and manufacture a bearing supporting apparatus at low cost. CONSTITUTION: A bearing 2 installed in a rotor 1 is bolted by bolting an upper part adjusting ring 3 and a lower part adjusting ring 4 by an up and down bolting bolt 9 and fixed unitedly by a fixing pin 5. The core of the rotor 1 is adjusted by building in a transversely fixing piece 11 and a shim (an adjusting piece) 15 between both side faces of the lower part adjusting ring 4 and a bearing stand 8 and a lower part fixing piece 12 and a shim 16 between the lower end of the lower part adjusting ring 4 and the bearing stand 8, and the upper part adjusting ring 3 is bolted and fixed in the bearing stand 8 by a fixing bolt 10 while a shim 14 being put between the ring 3 and the stand 8. A supporting apparatus is covered with a bearing stand cover 7 from the upper part and a lubricating oil is supplied through an oil supplying pipe 6.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bearing support device for a journal bearing which supports a rotor such as a steam turbine, and more particularly to a bearing support device having an adjusting function for positioning the bearing at a predetermined position.

[0002]

2. Description of the Related Art FIG. 2 is a basic constitutional view of a conventional bearing support device of this type, in which (a) is a longitudinal sectional view and (b) is (a).
FIG. The bearing 2 mounted on the rotor 1 is supported from below by a spherical seat B20 arranged on a spherical seat C21 bolted to the bearing base 8 by fixing bolts 23, and at the same time fixed to the bearing base 8 from above. With the holding bolt 18 installed above the bearing holder 17 bolted with the bolt 10, the spherical seat D2
4, and the spherical seat A19 fixed by the bearing 2 and the fixing pin 5 are supported. The entire support device
It is covered from above by a bearing stand cover 7 connected to the bearing stand 8. Lubricating oil to the rotating surface is supplied from both side surfaces of the bearing 2 through the oil supply pipe 6.

As shown in the sectional view of (b), in this bearing support device, a shim (adjustment piece) 15 and a spacer 22 are provided on both side surfaces of the bearing 2 for positioning the bearing 2 in the left-right direction.
And a shim 25 at the lower end of the bearing 2.
And the fixing piece 26 is incorporated. Further, for positioning the bearing 2 in the vertical direction, the bearing base 8 and the spherical seat C21 are used.
The lower fixing piece 12 is provided between the shim 14, the spherical seat B20 and the lower end of the bearing 2, and the upper end of the bearing 2 and the spherical seat A1.
An upper fixing piece 13 is incorporated between the parts 9. Therefore, the bearing support device can be flexibly adjusted even when the rotor core needs to be adjusted in response to secular change such as ground subsidence.

[0004]

As described above, the conventional bearing support device for a steam turbine rotor has a plurality of adjustment function parts built therein for positioning in the left-right direction and for positioning in the up-down direction. This is a device that can flexibly accommodate the core adjustment of the rotor. However, in the case of a light-load turbine rotor with a small bearing load, it is not necessary to have multiple adjustment functions as described above, because the secular displacement due to ground subsidence, etc. is small and no local adjustment is required. . Therefore, in the case of these turbine rotors, the conventional bearing support device has a plurality of adjusting function parts, and therefore, it takes a lot of time for manufacturing and assembling and adjusting the parts, and the manufacturing and assembling costs are low. There was a difficulty that it would be high.

The present invention has been made in view of this problem, and an object thereof is to be used for a light-load turbine rotor, to reduce the number of constituent parts, to shorten the processing and assembling time, and to reduce the cost. To obtain a bearing support device that can be manufactured.

[0006]

In order to achieve the above object, according to the present invention, a bearing support device for a steam turbine rotor has a first inner surface formed in a half ring shape.
The second semicircular adjustment ring, whose inner surface is formed in the shape of a half ring, is bolted to form an adjustment ring, and the bearing is held in close contact with the inner periphery of the adjustment ring. It will be configured by being bolted to and supported by.

Further, a fixing piece and a shim are interposed between the adjusting ring and the bearing stand, and bolts are used to support them.

[0008]

As described above, the first semicircular adjustment ring and the second
If the adjustment ring is constructed by bolting the semicircular adjustment ring of No. 2, the gap between the adjustment ring and the bearing is adjusted by adjusting the mating surface of the two semicircular adjustment rings. And can be configured as an integral structure. Therefore, if the adjusting ring is bolted to the bearing stand, the bearing is supported.

Further, a fixing piece and a shim are interposed between the adjusting ring and the bearing stand in the left-right direction and the vertical direction,
If the bolts are simply tightened, the cores of the bearing can be adjusted in the horizontal direction and the vertical direction.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a basic constitutional view of an embodiment of a bearing support device according to the present invention, (a) is a vertical sectional view, and (b) is an AA sectional view of (a). The bearing 2 attached to the rotor 1 is supported by bolting the upper adjusting ring 3 and the lower adjusting ring 4 with the vertical tightening bolts 9,
It is fixed by the fixing pin 5 and integrated. In addition,
By adjusting the mating surface of the upper adjusting ring 3, the clearance with the bearing 2 is adjusted.

A lateral fixing piece 11 is attached between both side surfaces of the lower adjusting ring 4 and the bearing base 8, and a lower fixing piece 12 is attached between the lower end of the lower adjusting ring 4 and the bearing base 8 to further adjust the lower portion. A shim (adjustment piece) 15 is provided between both side surfaces of the ring 4 and the bearing base 8, and a lower end of the lower adjustment ring 4 and the bearing base 8 are provided.
By sandwiching the shim 16 between and, and adjusting these, centering of the rotor 1 in the left-right direction and the up-down direction is performed.

The integrated upper adjusting ring 3, lower adjusting ring 4 and bearing 2 are adjusted by a shim 14 so that the lower adjusting ring 4 comes into close contact with the bearing base 8, and the upper adjusting ring 3 is fixed by the fixing bolt 10. It is fixed to the bearing base 8 by bolting. The whole supporting device is covered from above by a bearing stand cover 7 connected to a bearing stand 8. Further, the lubricating oil to the rotating surface is sent to the bearing 2 through the oil supply pipe 6, is branched and supplied from both side surfaces.

[0013]

According to the present invention, the bearing support device is provided with a first semicircular adjustment ring having an inner surface formed in a half ring shape and a second semicircular adjustment member having an inner surface formed in a half ring shape. The ring is bolted to form the adjustment ring,
Since the bearing is held in close contact with the inner circumference and is supported by bolting it to the bearing stand, the number of parts to be configured is greatly reduced compared to the conventional one, and bearing support that reduces manufacturing processing costs. It became possible to obtain the device.

Further, since the fixing piece and the shim are interposed between the adjusting ring and the bearing stand to fasten and support them by bolts, the core adjustment becomes easy and the assembly adjustment cost can be reduced. Became.

[Brief description of drawings]

FIG. 1 is a basic configuration diagram of an embodiment of a bearing support device according to the present invention, in which (a) is a longitudinal sectional view and (b) is A- of (a).
Section A

FIG. 2 is a basic configuration diagram of a conventional bearing support device of this type,
(A) is a vertical sectional view, and (b) is a sectional view taken along the line A-A of (a).

[Explanation of symbols]

 1 rotor 2 bearing 3 upper adjustment ring 4 lower adjustment ring 5 fixing pin 6 oil supply pipe 7 bearing stand cover 8 bearing stand 9 upper and lower tightening bolts 10 fixing bolt 11 lateral fixing piece 12 lower fixing piece 14 shim 15 shim 16 shim

Claims (2)

[Claims] 1. An adjusting ring is constructed by bolting a first semi-circular adjusting ring having an inner surface formed in a half ring shape and a second semi-circular adjusting ring having an inner surface formed in a half ring shape. The bearing support device is characterized in that the bearing is held in close contact with the inner periphery of the bearing and is fastened to the bearing base by bolts to support the bearing. 2. A bearing support device, characterized in that a fixing piece and a shim are interposed between the adjusting ring and the bearing base, and are bolted to support the fixing piece.