JPS6124599B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a guide bearing oil supply amount adjusting device for a vertical shaft rotating machine, which is equipped with a bearing oil supply mechanism using a pump action of the rotating shaft.

In general, for vertical shaft rotating machines such as water turbine generators, it is difficult to accurately determine the amount of oil supplied to the guide bearing of the rotating shaft based on theoretical calculations during design, so adjusting the amount of oil supplied is a simple operation. There is a desire to develop a device that can do this.

Regarding the water turbine generator, the structure of the guide bearing part and the oil supply mechanism will be explained with reference to FIGS. 12 are integrally formed concentrically, and an annular oil tank 14 is provided around the guide collar 12. This oil tank 14 is composed of a bottom wall 15, an inner circumferential wall 16, and an outer circumferential wall 17, and a sealing mechanism 1 is provided between the inner circumferential edge of a top lid 18 attached to the upper end of the outer circumferential wall 17 and the shoulder of the guide collar 12.
There are 9.

Inside the oil tank 14, a cylindrical bearing support 20 is installed concentrically with the guide collar 12.
The bracket 20a of the oil tank 14 and the bracket 17a of the outer peripheral wall 17 of the oil tank 14 are tightened and fixed with bolts 22, and an annular bearing support 24 extending toward the guide collar 12 is horizontally attached to the bottom surface of the bearing support 20. It is installed horizontally in the direction (radial direction). The bearing support 24 is
Its inner peripheral edge extends to the same position as the inner peripheral surface of the guide collar 12, and its upper surface faces the lower end surface of the guide collar 12 in parallel with a gap 40 in between.

Guide bearing pads 26 consisting of a plurality of segment-shaped columns are disposed on the bearing support 24 at equal intervals in the circumferential direction, and are brought into sliding contact with the outer circumferential surface of the guide collar 12 through the guide collar 12. It guides and holds the rotating shaft 10. Reference numeral 27 is a supporting leg of the guide bearing.

The bearing support 20 is provided with a clearance adjustment device 28 between the bearing surface of the guide bearing pad 26 and the outer peripheral surface of the guide collar 12. This gap adjustment device 28
The spherical part of the key guide 30 is brought into contact with the block 29 fitted on the outer peripheral surface of the guide bearing pad 26,
A taper key 31 inserted into the bearing support 20 is fitted into the key guide 30, a bolt 32 at the upper end of the taper key 31 is inserted into the protruding plate 21 of the bearing support 20, and a nut 33 is screwed. The guide bearing pad 26 is configured to move back and forth in the radial direction via the key guide 30 by rotating the nut 33 and moving the taper key 31 up and down in the axial direction.

The guide collar 12 is supported by the guide bearing pad 26 as described above, and this bearing portion is connected to the oil tank 1.
4 and immersed in lubricating oil.

Further, on the bottom wall 15 of the oil tank 14, a cooler 35 formed in an annular shape by combining cooling water pipes (not shown) is installed in the circumferential direction.

Thus, when the rotating shaft 10 rotates, the rotating shaft 1
The centrifugal force of the guide collar 12 rotating together with the guide collar 12 causes a pumping action on the lower end surface of the guide collar 12, and the lower end surface of the guide collar 12 and the bearing support 2
The gap between the guide collar 12 and the guide collar 12 forms an oil supply passage 40, and the lubricating oil sucked into the oil supply passage 40 from the inner peripheral surface side of the guide collar 12 flows out to the outer peripheral surface side, and lubricates the bearing surface of the guide bearing pad 26. be done. The lubricating oil whose temperature has increased by lubricating the guide bearing pad 26 in this manner circulates as shown by the arrow in the figure, is cooled by the cooler 35, and is then sucked into the oil supply passage again.

In the water turbine generator equipped with the above-mentioned oil supply mechanism,
The suction force generated by the pump action of the guide collar 12 depends on the rotational speed of the guide collar 12, the axial and radial sizes of the oil supply passage 40 between the guide collar 12 and the bearing support 24, as well as the characteristics of the lubricating oil and other factors. This varies depending on various usage conditions, so if necessary and sufficient lubrication is not being provided at the time of initial operation when assembling a water turbine generator, during operation after operation, or during periodic inspections, please take appropriate action. As a countermeasure, it is necessary to install a refueling amount adjustment device to ensure that an appropriate amount of refueling is obtained.

Therefore, as shown in FIG. 1, a partition plate 37 with an L-shaped cross section is attached to the bearing support 24 in the circumferential direction to increase or decrease the cross-sectional area of the oil supply passage 40 between the lower end surface of the guide collar 12. The amount of oil supplied is adjusted by

However, with such an adjustment device using a partition plate, the partition plate cannot be installed unless the guide bearing pad is removed and removed from the clearance adjustment device, or the rotating shaft and guide collar themselves are disassembled and removed. First, furthermore, assembly work is required after the partition plate is attached, which requires a large amount of man-hours and time. Due to these circumstances, in reality, even if the amount of refueling is incorrect, unless it leads to a serious accident,
The problem is that no partition plate is installed, and the operator is forced to operate with an inappropriate amount of oil supplied, making it virtually impossible to adjust the amount of oil supplied properly. .

This invention has been made in view of the above-mentioned problems, and provides a device that can be installed without disassembling or reassembling the guide bearing portion, and that allows fine adjustment of the amount of oil supply with simple operation. The purpose is to

Embodiments of the present invention will be described below with reference to the drawings.

FIGS. 3 and 4 show examples in which the present invention is applied to the water turbine generator shown in FIGS. 1 and 2. Since there is no difference in the structures of the rotating shaft, guide collar, and guide bearing, the same parts are designated by the same reference numerals and detailed explanations will be omitted.

At the upper end of the bearing support 20, stud guides 42 are provided to protrude radially inward between pads of adjacent guide bearings 26, respectively. This stud guide 4
2 is provided with a bolt hole (not shown) in the axial direction. A stud bolt 44 is inserted into this bolt hole into the oil tank on the lower side in the axial direction, and a nut 46 screwed onto the upper end of the stud bolt 44 is inserted into the bolt hole. Stud guide 42
It is in contact with the upper end surface of. Studbold 44
An oil amount adjusting plate 48 is attached in the radial direction to the lower end of the holder. This oil amount adjusting plate 48 has a cylindrical vertical member 48b formed axially downward on the inner circumferential edge of an annular horizontal member 48a, and the vertical member 48b is brought close to the inner circumferential surface of the bearing support 24 so as to be horizontal. Member 48a
is inserted parallel to the gap (oil supply passage) 40 between the lower end surface of the guide collar 12 and the bearing support 24.
A hole (not shown) through which the support leg 27 of the guide bearing pad 26 passes is bored in the horizontal member 48a.

In this way, the oil amount adjusting plate 48 is connected to the stud bolt 44 and the nut 4 at the upper end of the stud bolt 44.
6, suspended from the stud guide 42,
It can be moved up and down in the axial direction via a nut 46.

With the above configuration, the guide bearing pad 26
The oil is supplied to the gap 4 between the lower end surface of the guide collar 12 and the horizontal member 48a of the oil amount adjusting plate 48.
1, so when adjusting the oil supply amount, rotate the nut 46 in either forward or reverse direction and move the oil amount adjustment plate 48 downward or upward via the stud bolt 44. The cross-sectional area of the gap 41 is increased or decreased by increasing or decreasing the cross-sectional area of the gap 41.

When there is no need to adjust the oil supply amount, the oil amount adjustment plate 48 may be lowered to keep the horizontal member 48a in contact with the bearing support 24.

As described above, the present invention provides an oil amount adjusting plate that is horizontally inserted into the gap between the lower end surface of the guide collar and the annular bearing support horizontally opposed thereto, and the oil amount adjusting plate is inserted into the stud. Since it is configured to be moved up and down via the nut of the bolt, according to the present invention, installation of the clearance adjustment device for adjusting the amount of oil supplied to the guide bearing pad does not require the trouble of disassembling the rotating shaft and guide collar. Not only is it easy to install without having to worry about oil volume adjustment, but the adjustment nut on the oil volume adjustment plate can be rotated from a position close to the top lid of the oil tank, making the adjustment process itself extremely simple. Since the amount of vertical movement of the plate can be accurately determined by the rotation angle of the adjusting nut, the amount of oil supplied can be finely adjusted, resulting in the effect of easily adjusting the amount of oil to an appropriate level.

[Brief explanation of the drawing]

Fig. 1 is a half-longitudinal cross-sectional view showing the bearing part of a conventional water turbine generator, Fig. 2 is a cross-sectional view taken along line A-A in Fig. 1,
FIG. 3 is a half-longitudinal sectional view showing an embodiment of the present invention, and FIG. 4 is a sectional view taken along the line B--B in FIG. 12... Guide collar, 20... Bearing support, 24... Bearing support, 26... Guide bearing pad, 40... Oil supply passage, 42... Stud guide, 44... Stud bolt, 46... Nut, 48... Oil amount adjustment plate.

Claims (1)

[Claims] 1. A vertical shaft rotating machine in which a guide collar formed integrally and concentrically with the rotating shaft on the outer periphery of the rotating shaft of the vertical shaft rotating machine and a guide bearing consisting of a plurality of pads supporting the guide collar are accommodated in an oil tank. An oil supply passage is provided between the lower end surface of the guide collar and an annular bearing support provided horizontally opposite to the lower end surface of the guide collar, so that a pumping action accompanying rotation of the guide collar is provided. Then, between the pads of adjacent guide bearings which are provided concentrically on the outside of the guide bearing pads and fixed by the bearing supports, the stud guides are respectively radially connected to the bearing supports. A stud bolt is inserted into the oil tank on the lower side in the axial direction from the stud guide, and an annular oil volume adjustment plate with an inner circumference bent in the axial direction attached to the lower end of the stud bolt is attached to the oil tank. Insert the oil level adjustment plate horizontally into the oil supply passage between the lower end of the guide collar and the bearing support, and screw the nut onto the upper end of the stud bolt so that it is in contact with the upper end of the stud guide. A guide bearing lubrication adjustment device for a vertical shaft rotating machine, characterized by being able to move up and down in the axial direction.