JPS60200747A - Inspecting method of vertical thrust bearing - Google Patents

Abstract

PURPOSE:To facilitate an inspecting work by radially increasing a space between the body of a rotational shaft and the bore of a thrust collar. CONSTITUTION:A rotational shaft 21 of a thrust bearing radially increases a space between the outer periphery of a body 21a and the bore of a thrust collar 22 integrally formed to draw a thrust pad 23 to the space side. A plurality of pads 23 are disposed circumferentially in a sector shape, and, the collar 22 is rotatably supported from below. The pads 23 are supported through a retainer 24, a pivot 6 and an annular supporting base 25 to the lower interior of a bearing oil tank 26. Further, a guide bearing 27 and an oil cooler 28 are provided. Thus, an oil weir 30 of the tank 26 is removed, the pads 23 are drawn on a drawing guide frame, moved down by an elevator and can be inspected without necessity of drawing the cooler 28 to facilitate the inspecting work.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention provides an inspection method for a vertical thrust bearing in which the thrust pad can be removed without pulling out the rotor or disassembling the oil cooler in the bearing oil tank. Regarding the method.

[Prior art]

Figures 1 and 2 show a vertical thrust bearing device that performs the conventional bearing inspection method, for example, in a vertical shaft water turbine generator.
The figure shows a vertical sectional view and a plan sectional view. (1) is a rotor with a vertical shaft, which is fixed to a rotating shaft (2). (3) is a thrust collar provided integrally or fixedly on this rotating shaft (2), and (4) is a thrust pad that rotatably supports this thrust collar (3) from below. A plurality of them are arranged in each direction. (5
) is a plurality of receiving plates receiving each thrust pad (4), (
6) is a plurality of pivots supporting each receiving plate, (7)
) is an annular support base that screws in and supports these pivots (6), and is fixed to the inner lower part of the bearing oil tank (8). (
9) is a guide bearing in which a plurality of guide bearings are arranged in the circumferential direction on the outer circumference of the thrust collar (3), each with a push pole)
(It is received by the support ring θυ through 11. (2) is an oil cooler in which a plurality of oil coolers are arranged in the circumferential direction in the bearing oil tank (8), and a cooling water pipe is arranged. Oil tank (8)
It is inserted through the insertion hole (8a) provided in the oil tank (
8) is removably and oil-tightly mounted on the outer part of the. The α frame is the oil weir that becomes the inner part of the oil tank (8).
) is installed in an oil-tight manner at the bottom of the Q→ is lubricating oil.

The conventional method for inspecting thrust bearings without pulling out the rotor was as follows. First, the lubricating oil Q4 is drained, the rotor (2) is slightly pushed up and supported by a plurality of separately installed jacking devices, and the thrust collar (3) is cleared from above the thrust pad (4). Next, the first
As shown in the figure, remove all oil coolers (a) from the oil tank (8).

Next, as shown in Fig. 3, use the insertion hole (8a) e,
Install the drawer guide stand (a) by passing it inside and out. A pair of moving members αQ with casters attached to the lower part are attached to both sides of the thrust pad (4), and the top of the drawer guide frame αθ is pulled out.

In this way, the thrust pad (4) is inspected and, if necessary, repaired or replaced with a spare part.

Reassembly is performed in the reverse order of the above disassembly.

The conventional inspection method described above requires the oil cooler (the oil cooler) to be divided into multiple pieces that can be detachably attached to the oil tank (8). )
It was extremely troublesome to mount it oil-tightly on the outside of the. Still, the oil tank (8) had to have insertion holes (8a) at multiple locations, making the structure complicated.

[Summary of the invention]

This invention was made in order to eliminate the drawbacks of the above-mentioned conventional methods, and the space between the outer diameter part of the shaft body of the rotating shaft and the inner diameter part of the thrust collar is enlarged in the radial direction. Then, the oil weir of the bearing oil tank is removed, a drawer guide is placed on the side of the empty space, the thrust pad is pulled out onto the drawer guide, and the thrust pad is lowered by a lifting device for inspection. The container is annular and integrated, and the pad inspection tank does not require any work to disassemble and reinstall.It also eliminates the need for an insertion hole on the outside of the bearing oil tank, which simplifies the structure and makes inspection work easier. The purpose of this paper is to provide an inspection method for type thrust bearings.

[Embodiments of the invention]

Hereinafter, a method for inspecting a vertical thrust bearing according to an embodiment of the present invention will be explained with reference to the drawings. Figure 4 is a longitudinal cross-sectional view of the thrust bearing device to be inspected, (1),
t61, (to), α→ are the same as those of the above conventional device. ○The rotation axis Qυ is the space between the outer diameter part of the shaft body part (21a) and the inner diameter part of the integrally formed thrust collar (A). It is made thicker in the radial direction at certain points to enable the thrust pad (c) to be drawn out to the empty space side. Thrust pad @
is fan-shaped and multiple pieces are arranged in the circumferential direction,
It rotatably receives the thrust collar (A) from below. These thrust pads @ are each received by a receiving plate (c), and each receiving plate (c) is supported by a pivot (6), respectively. (A) is an annular support base that screws in and supports these pivots (6), and is fixed to the inner lower part of the bearing oil tank (C).The outside of this bearing oil tank (A) has a conventional insertion hole. ○ (A) is a plurality of guide bearings arranged on the outer circumference of the thrust collar (C), each of which is received by the support ring (A) through the push pole (10). (A) is an oil cooler installed in the bearing oil tank (A), formed into an integral ring shape in the circumferential direction, and equipped with cooling water pipes.0 (2) is the oil cooler installed inside the oil tank (E). It is installed oil-tightly at the bottom of the oil tank (a).

Next, a method for inspecting the thrust bearing of the apparatus configured as described above will be explained. First, drain the lubricating oil a → from the oil tank (a) in Figure 4, and remove the oil weir shaft. QAs shown in Figure 5,
The rotor (2) is slightly pushed up and supported by a plurality of separately installed jacking devices (not shown) to create a thrust collar.
Clear it from Thrustno (rad@).

Next, attach an annular rail 01) to the ceiling of the hollow space on the inner diameter side of the thrust collar of the rotating shaft (al), and attach an annular rail 01) to the ceiling of the empty space on the inner diameter side of the thrust collar @ of the rotating shaft (al), and attach the elevating MO system consisting of a chain block or the like to the annular rail 01).
1) Suspend and support. Next, place the drawer guide stand (C) on the inner diameter side of the thrust pad (A) to be inspected.
A few lines are written on the inner diameter of the tube. 1 with casters attached to the bottom
Attach the pair of moving members (1 (9) to both sides of the thrust pad @, remove the pair of moving members H of the 0 thrust pad that is pulled out onto the drawer guide stand, Connect them to both sides of the thrust pad (A).

After doing this, lift the thrust pad a little using the lifting device 0→, move it in the circumferential direction guided by the annular rail 0υ to a position where it is off the top of the drawer guide table (c), and then lift the thrust pad (c). Descend and inspect.

After this, move the drawer guide stand (b) to the next thrust pad (e).
Attach it to the position corresponding to , then remove the thrust pad (A) from that location and inspect it using the same procedure as above.

Reassembly of the inspected and repaired thrust pad (a) is performed in the reverse order of the above disassembly.

In the above embodiment, the movement of the drawer on the drawer guide stand (b) of the thrust pad (c) is performed by moving member a with casters.
Q is attached to both sides of the pad @, but a plurality of guide rollers may be rotatably disposed on the drawer guide stand, and the thrust pad (A) may be pulled out and moved on top of this.

In addition, in the above embodiment, the annular rail 0υ was installed by suspending the lifting device (A) and installing the drawer guide stand ■ on the oil tank (E) side, but the hydraulic lifting device was attached to the bottom of the drawer guide stand. The guide stand itself may be moved up and down by placing a thrust pad@ thereon.Furthermore, in the above embodiment, the thrust collar (A) is formed integrally with the rotation axis eη, It can also be applied when the thrust collar is fixed to the rotating shaft.

〔Effect of the invention〕

As described above, according to the method of the present invention, the space between the shaft body of the rotating shaft and the inner diameter of the thrust collar is enlarged in the radial direction, the oil weir of the bearing oil tank is removed, and the A drawer guide frame is placed in the empty space, the thrust pad is pulled out onto the drawer guide frame, and the thrust pad is lowered and inspected using a lifting device, so the oil cooler does not require a drawer and is integrated. In general, disassembly and reinstallation are not necessary, and the bearing oil tank does not require an insertion hole on the outside, which simplifies the structure and facilitates inspection work.

[Brief explanation of the drawing]

Figure 1 shows a vertical cross-section of a thrust bearing device showing a conventional vertical thrust bearing inspection method, and Figure 2 shows the ll-H of Figure 1.
3 is a vertical sectional view showing a state in which the thrust pad shown in FIG. 1 is pulled out; FIG. FIG. 5 is a longitudinal sectional view showing the thrust pad of FIG. 4 in an extended state. 14... Lubricating oil, 21... Rotating shaft, 21a... Shaft part, 22... Thrust collar, 23... Thrust pad, 26... Bearing oil tank, 29... Oil cooler, 30...・
Oil weir, 31... Annular rail, 32... Lifting device,
34...Drawer guide stand Note that the same reference numerals in the drawings indicate the same or corresponding parts. Figure 1

Claims (3)

[Claims] (1) The space between the outer diameter part of the shaft body of the rotating shaft and the inner diameter part of the thrust collar is formed to be large in the radial direction, and the oil weir of the bearing oil tank is removed and pulled out to the above space side. A method of inspecting a vertical thrust bearing in which a guide table is arranged, the thrust pad is pulled out onto the pull-out guide table, and the thrust pad is lowered by a lifting device to be inspected. (2) Suspend the lifting device from the annular rail attached to the ceiling on the inner diameter side of the thrust collar, pull out the thrust pad onto the drawer guide stand attached to the inner diameter side of the bearing oil tank, and use the above lifting device to pull out the thrust pad. A method for inspecting a vertical thrust bearing according to claim 1, wherein the vertical thrust bearing is lowered. (3) A hydraulic lifting device is installed below the drawer guide to raise and lower the drawer guide, and the thrust pad is pulled out onto the drawer guide in the raised position to lower the drawer guide. A method for inspecting a vertical thrust bearing according to claim 1.