JP3338733B2 - Bearing device for vertical rotating machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bearing device for a vertical rotating machine.

[0002]

2. Description of the Related Art The structure of a bearing device for a conventional vertical shaft type rotating machine and the flow of lubricating oil will be described with reference to FIG. As shown in FIG. 5, the cylindrical bearing 1 has pocket-shaped oil sumps 2 and 3 over the entire circumference at two locations on the upper and lower sides of the inner peripheral surface, and exhausts radially extending outward from the upper and lower oil sumps. An oil hole 4 and an oil supply hole 5 are provided, and several oil grooves 6 are provided so as to connect the upper oil reservoir 2 and the lower oil reservoir 3. In this cylindrical bearing 1, the oil reservoir 3 and the oil supply hole 5 on the lower side are installed so as to be immersed in lubricating oil.

[0003] The flow of lubricating oil in a bearing having such a structure is as follows.
Due to the viscous pump effect of the sliding surface between the cylindrical bearing 1 and the collar 7, lubricating oil is sucked from the oil supply hole 5, and the oil groove 6 and the sliding surface between the bearing 1 and the collar 7 are lubricated via the oil reservoir 3. The oil is discharged from the oil drain hole 4 via the oil sump 2.

[0004]

In a bearing device of a vertical shaft type rotating machine having a conventional structure, air is discharged from a weir 8 on an upper oil sump 2 of a cylindrical bearing 1 at a high speed rotation or a high lubricating oil temperature. The oil is sucked, mixed with the lubricating oil in the oil sump 2, becomes a lubricating oil having many air bubbles, and is discharged from the oil drain hole 4. A large amount of oil leakage 13 due to the siphon effect from the space between 11 and the oil cylinder 10
Was caused.

[0005] The phenomenon of the mechanism of the suction of air into the lubricating oil will be described with reference to the drawings. Event 1) Pressure in bearing oil sump 2 The lubricating oil pushed up by the bearing viscous pump is collected in the oil sump 2 and discharged from several oil drain holes 4 extending radially from the oil sump 2. As shown in FIG. 6, the pressure distribution in the inside is such that the farther the oil drain hole 4 is, the higher the pressure is, and the part of the oil drain hole 4 has the lowest pressure. The pressure in this sump 2 is
It increases as the number of rotations of the collar 7 increases. The portion of the oil drain hole 4 where the pressure is released has a higher pressure as it is farther from the oil drain hole 4.

If the collar 7 is rotating without eccentricity, the pressure in the oil sump 2 is positive in any part, so that the lubrication is also performed from the space between the upper crest 8 of the bearing 1 and the collar 7 to the outside. The oil is discharged, no air is sucked from the weir 8, and no air bubbles of the lubricating oil are generated. Event 2) Pressure between the weir 8 and the collar 7 On the other hand, since the collar 7 is actually rotating (rotating) eccentrically on the sliding surface of the bearing 1 and is a vertical shaft type, the bearing load is small.
It is running around the inner peripheral surface of the bearing. At this time, the pressure distribution between the weir 8 and the collar 7 is "A" as shown in FIGS.
In the part, the pressure is high (positive pressure) in the compression part, and in the part "B", the compression is released and the pressure is low (negative pressure).

The pressure difference between the "A" portion and the "B" portion increases as the rotation speed of the collar 7 increases. Event 3) Mechanism of suction of air into oil sump 2 Event 2) the upper part of oil sump 2 having the pressure distribution described in event 1)
In the case where the pressure distribution described in the above moves in the whirling motion of the collar 7, when the portion "B" of the negative pressure of the event 2) comes to the portion of the oil drain hole 4 where the pressure is low in the event 1), the portion becomes a negative pressure. , Cough 8
Air is sucked from between the oil and the collar 7 to generate air bubbles in the lubricating oil in the oil reservoir. The negative pressure in the "B" portion increases as the rotation speed increases, so that the amount of air suction increases and the number of bubbles in the lubricating oil increases.

When the lubricating oil temperature rises, the viscous pump effect in event 1) is weakened, the overall positive pressure level decreases, and even when the rotation speed does not increase, event 2) occurs.
A partial negative pressure is generated due to the effect of the above, causing air to be sucked.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a bearing device for a vertical shaft type rotating machine configured to prevent the generation of air bubbles in an oil tank even at high speed rotation or when the temperature of lubricating oil is high. I do.

[0010]

To achieve the above object of the Invention The present invention is respectively provided on the entire circumference I Wataru the upper side and the lower side of the inner circumferential surface in the cylindrical bearing of the vertical shaft type rotary machine Oil sump
And extend radially outward from each of these sumps .
The a plurality of oil discharge hole and oil supply holes, and a oil groove of the double several drilled for communicating between each set <br/> vignetting oil reservoir in the vertical direction on the inner peripheral surface, the lubricating oil of the oil level bearing device arranged vertical shaft type rotary machine between the oil reservoir, the upper side respectively
The oil discharge control pipe outside side outlet of Haiyuana provided in the oil reservoir
The oil discharge flow rate of this oil drain adjustment pipe is
Throttle according to the number of oil drain holes in the sump provided on the upper side
The pressure in the part is adjusted higher.

[0011]

[Action] In the present invention configured as described above, the oil discharge adjustment reduced by changing the area of the oil outlet of the pipe, by throttling according to the flow rate of the oil discharge to the rotation speed of the rotating machine, the upper side
Oil sump drain holes provided ( parts above the lubricating oil level)
Pressure ) to equalize the pressure in the oil sump.
As a result, even if the negative pressure of the “B” portion of the above event 2 is applied to the oil drain hole portion of the above event 1, the pressure there can be maintained at a positive pressure, and the air in the oil sump can be maintained. Suction can be eliminated, and the generation of bubbles of lubricating oil can be prevented.

[0012]

An embodiment of the present invention will be described below with reference to the drawings. As shown in FIGS. 1 to 3, the cylindrical bearing 1 has pocket-shaped oil sumps 2, 3 on the upper and lower sides of the inner peripheral surface over its entire circumference, and upper and lower oil sumps 2, 3. above the oil level of the plurality of Haiyuana 4 (lubricating oil extending radially outwardly from
Position), the oil supply holes 5 are provided respectively. An oil drain adjustment pipe 12 is provided at an outlet of the upper oil drain hole 4, and a plurality of oil grooves 6 are provided so as to connect the upper oil reservoir 2 and the lower oil reservoir 3. I have. In addition, cylindrical bearing 1
So that the lower oil reservoir 3 and the oil supply hole 5 are immersed in the lubricating oil.
is set up.

The lubricating oil of the bearing device thus constructed is sucked in from the oil supply hole 5 by viscous pump effect of the sliding surface of the cylindrical bearing 1 and the collar 7, passes through the oil reservoir 3, The sliding surface between the bearing 1 and the collar 7 is lubricated and discharged from the oil drain hole 4 via the oil reservoir 2 . At this time, the area of the oil drain port 14 of the oil drain adjustment pipe 12 installed at the outlet of the oil drain hole 4 is changed to a small value according to the rotation speed, and the discharge amount of the lubricating oil is reduced, as shown in FIG. The pressure in the sump 2 can be increased and the pressure in the sump 2 can be averaged higher.

According to the configuration of the embodiment described above, since the pressure in the oil reservoir 2 can be increased, even when the rotational speed is high and the lubricating oil temperature is high and the effect of the viscous pump is low, the weir 8 Air can be prevented from being generated from the space between the collar 7 and the air without sucking air.

FIG. 4 shows the results of the measurement of the specific gravity of the lubricating oil in the oil tank when the amount of discharge of the lubricating oil is reduced according to the present embodiment and in the case of the conventional structure. In the conventional case, the specific gravity of the lubricating oil keeps decreasing with time, which indicates that bubbles in the lubricating oil continue to increase.

According to this embodiment, when the emission amount is reduced, 1
The specific gravity hardly changes in time. This indicates that no air has entered the lubricating oil and no air bubbles have been generated.

[0017]

As described above, according to the present invention, even in a bearing device of a vertical shaft type rotating machine used under any conditions, it is possible to prevent the oil level from rising due to the generation of bubbles in the oil tank and causing oil leakage. A highly reliable vertical shaft type rotating machine bearing device can be provided.

[Brief description of the drawings]

FIG. 1 is a sectional view of a bearing device of a vertical shaft type rotating machine according to an embodiment of the present invention.

FIG. 2 is an expanded view of a bearing sliding surface in the embodiment shown in FIG.

FIG. 3 is a pressure distribution diagram of an upper oil reservoir of the embodiment shown in FIG.

4 is a graph showing measurement results of specific gravity of lubricating oil in an oil tank in the embodiment shown in FIG. 1 and a conventional bearing device.

FIG. 5 is a sectional view of a bearing device of a conventional vertical shaft type rotating machine.

FIG. 6 is a pressure distribution diagram of an upper oil reservoir of the conventional bearing device shown in FIG.

FIG. 7 is a plan view and a pressure distribution diagram of a bearing upper crest of the conventional bearing device shown in FIG.

8 is a pressure distribution diagram of a bearing upper crest of the conventional bearing device shown in FIG.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Cylindrical bearing, 2, 3 ... Oil sump, 4 ... Oil drain hole, 5 ... Oil supply hole, 6 ... Oil groove, 12 ... Flow control device, 14 ... Oil drain port.

Claims (1)

(57) [Claims] 1. A of the inner peripheral surface in the cylindrical bearing of the vertical shaft type rotary machine upper side and the oil reservoir provided I over a period of lower side respectively the entire circumference
And extend radially outward from each of these sumps .
The a plurality of oil discharge hole and oil supply hole, and an oil groove of the double several drilled for communicating between each set <br/> vignetting oil reservoir in the vertical direction on the inner peripheral surface, the lubricating oil of the oil level bearing device arranged vertical shaft type rotary machine between the oil reservoir, the upper side respectively
The oil discharge control pipe outside side outlet of Haiyuana provided in the oil reservoir
The oil discharge flow rate of this oil drain adjustment pipe is
Throttle according to the number of oil drain holes in the sump provided on the upper side
A bearing device for a vertical shaft type rotating machine, wherein a pressure of a portion is adjusted to be higher .