JP3328052B2 - Radial bearing with lubricating oil level adjustment function for lubricating oil tank - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to improvement of lubrication of a radial bearing of a horizontal rotating machine having a lubricating oil tank filled with lubricating oil, and more particularly to a lubricating oil tank having a lubricating oil level adjusting function. When the bearing metal of the main shaft has run out of oil film due to a long-term stop of the shaft rotating machine, when starting up, adjust the lubricating oil surface of the lubricating oil tank to form an oil film on the bearing, and damage to the bearing metal due to running out of oil film on the bearing The present invention relates to a radial bearing having a function of adjusting the oil level of a lubricating oil tank that can prevent the occurrence of oil.

[0002]

BACKGROUND OF THE INVENTION Today's sources of electrical energy include:
Nuclear, thermal and hydroelectric power plants and the like. Then, the electric power generated in each of these power stations is connected to a large power system, integrated once, and transmitted and distributed to each customer.

[0003] From the above relationship, the operation methods of each power station are classified into base load and peak load according to the difficulty and ease of starting / stopping (adjustment of power generation output) and the scale of the power station. You.

[0004] Nuclear power plants which are large in scale and difficult to start and stop are usually operated continuously for a long period of time for base loads. Generally, thermal power plants are operated continuously for a long period of time for base loads, and small-scale ones are operated only for peak periods for peak loads, depending on the size of the thermal power plants.

[0005] Generally, hydropower stations are not only easy to start and stop, but are also relatively small in scale, so that they are often operated at peak loads for peak loads. Or, during the drought period, the operation may be stopped for a long time. Furthermore, as a small-capacity turbine generator installed in a small-scale hydroelectric power plant, a horizontal axis generator having a simpler structure than that of a vertical axis is frequently used, and as described above, the operation is stopped for a long time. Often.

Normally, lubricating oil is supplied to a bearing (radial bearing) of a horizontal rotating machine through a main shaft of the horizontal rotating machine, and an upper inner peripheral surface thereof is in contact with an upper outer peripheral surface of the main shaft. The lower part is immersed in the lubricating oil in a lubricating oil tank provided below the bearing box of the rotating machine, and rotates with the rotation of the main shaft by the operation of the rotating machine, and removes the lubricating oil. An oil ring that lifts and supplies the lubricating oil from the upper part of the main shaft, or is fitted to the main shaft of the horizontal shaft rotating machine, and the lower part is immersed in the lubricating oil and rotates with the rotation of the main shaft to scrape the lubricating oil. It is carried out by an oil disk (viscosity pump) that supplies lubricating oil from the upper part of the main shaft by frying. The main shaft of the rotating machine is cooled by the lubrication, and an oil film is formed on the bearing metal.

As described above, during operation of the horizontal shaft rotating machine, the oil film is formed on the bearing metal surface constituting the bearing surface of the radial bearing, and the bearing metal surface and the bearing portion of the rotating machine main shaft are in contact with each other. To protect the bearing metal and the bearing of the main shaft during operation. The oil film of the bearing metal is usually formed for several days even after the rotation of the rotating machine is stopped. However, when the stop period is long, the oil film gradually disappears and the oil film is broken.

[0008]

When the rotating machine is started under the above-mentioned state of oil film shortage, the bearing metal and the bearing portion of the rotating machine main shaft are damaged. For example, in an unmanned hydroelectric power plant or the like, A technician had to go to the power plant, spray the lubricant onto the bearing metal from the lubricant supply port, and then start the rotating machine. Therefore,
It has not been easy to start the operation of the rotating machine after a long-term operation stoppage due to the oil film shortage of the bearing.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has as its object to raise the lubricating oil level of a lubricating oil tank to automatically apply the lubricating oil level to a bearing metal surface when starting after a long-term operation stop. An object of the present invention is to provide a radial bearing having a function of adjusting a lubricating oil level of a lubricating oil tank in which an oil film is formed on a lubricating oil tank so as to prevent damage to the bearing metal due to a break in the oil film of the bearing.

[0010]

According to the present invention, there is provided a horizontal rotating machine having a main shaft supported by a radial bearing and having a lubricating oil tank filled with lubricating oil for lubricating the radial bearing. , A separate oil collecting tank filled with the same lubricating oil as the lubricating oil, and a connection between the oil collecting tank and the lubricating oil tank via an oil return pipe, and forward and reverse rotation of the two oil tanks A lubricating oil pump for adjusting the lubricating oil level of the lubricating oil tank by exchanging lubricating oil between the lubricating oil tank, and detecting a scheduled high / low oil level of the lubricating oil in the lubricating oil tank, A lubricating oil level adjusting device comprising a drive signal, a forward / reverse rotation of the drive motor, and an oil level detector for sending a stop signal and a phase sequence switching signal to the drive motor; Oil film breakage on the bearing metal of the main shaft At the time of stop, when the horizontal shaft rotating machine is started, the return oil pump is rotated forward, and the lubricating oil in the oil collecting tank is lubricated until the lubricating oil level of the lubricating oil tank reaches the predetermined high oil level. It is characterized by feeding oil to the oil tank, returning the oil to the oil collecting tank after a certain time limit, and starting.

[0011]

[Function] When the oil film on the bearing metal of the main shaft of the horizontal shaft rotating machine breaks, the reciprocating oil pump is rotated forward to send the lubricating oil in the oil collecting tank to the lubricating oil tank, and the oil film is automatically applied to the bearing metal surface. Since the lubricating oil level is raised to the height at which the bearing metal is formed, damage to the bearing metal due to a break in the oil film of the bearing can be easily prevented.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a diagram showing an embodiment of the present invention.
FIG. 2 is a partially cutaway front view of a horizontal shaft rotating machine to which the present invention is applied, and FIG. 2 is a cross-sectional view of a bearing B- of a main shaft of the horizontal shaft rotating machine of FIG.
FIG. 4 is a partially cutaway sectional view taken along the line B in the direction of the arrow, in which a bearing main body supporting the main shaft is omitted, and the same portions are denoted by the same reference numerals.

1 and 2, reference numeral 10 denotes a bearing box provided at one end of the horizontal shaft rotating machine, and reference numeral 10a denotes a cover for covering the upper surface thereof. On the upper part of the bearing box 10, although not shown, a bearing main body is supported on a bearing stand erected just below the bearing part 12 of the main shaft of the horizontal rotating machine on the upper surface of the bed 11 of the horizontal rotating machine, The bearing metal 12 attached to the inner peripheral surface of the bearing body serves as a bearing portion 12 of the main shaft.
Is supported. Therefore, the bearing 12 of the spindle
Penetrates through the upper center of the bearing box 10 as shown.

A lubricating oil tank 13 is provided below the bearing box 10. The lubricating oil tank 13 is lifted up by a viscous pump 14, which will be described in detail later. The lubricating oil 13a that is supplied and lubricates the above-described bearing main body (not shown) is injected up to the position of the specified oil level 13b. However, in a state where the lubricating oil 13a is injected to the position of the specified oil level 13b, the lubricating oil 13
Without supplying a, an oil film cannot be formed on the bearing metal of the bearing body.

As is clear from the above description, the lubricating oil tank 13 is divided into upper and lower parts at the center by using the above-mentioned bearing base as a partition, but it is practically one tank. It is configured.

As described above, the viscous pump 14 is fitted to the bearing 12 of the main shaft on the right side in the figure, and the lower end thereof is
3a, an oil disk 14a immersed in the oil disk 14a, and a cover 14b for covering left, right, and upper surfaces of the oil disk 14a.
The lubricating oil 13a which is connected to the cover 14b and is provided on the upper left side of the drawing and which is lifted up by the rotation of the oil disk 14a and filled in the upper part of the cover 14b is introduced, and the lubricating oil 13a is supported by the main bearing. And a lubricating oil supply pipe 14c discharged to the upper peripheral surface of the portion 12.

17a and 17b are the above-mentioned viscous pumps 14
Thus, the lubricating oil 13a supplied to the upper peripheral surface of the bearing portion 12 of the main shaft and lubricating the bearing body (not shown) is prevented from scattering to the outside of the bearing box 10 due to the rotation of the main shaft.

The structure of the bearing box 10 described above is as follows.
It is the same as the well-known one conventionally used, but hereinafter, the specified oil level 13 of the lubricating oil 13a which is a feature of the present invention.
The lubricating oil level adjusting device for adjusting b will be described. FIG.
1 is a partially cutaway front view of a horizontal shaft rotating machine to which the present invention is applied, as described above.

In FIG. 1, a lubricating oil level adjusting device 15 is provided on a bed 15a which is an extension of the bed 11 of the horizontal shaft rotating machine. The lubricating oil level adjusting device 15 is provided on a bed 15a, and is provided with an oil collecting tank 15b in which lubricating oil is injected, and is provided on an upper lid of the oil collecting tank 15b, and is connected to the lubricating oil tank 13 by a return oil pipe 15c. Oil return pump 15d,
By rotating the oil return pump 15d forward and backward, the oil return pipe 15 is provided between the oil collecting tank 15b and the lubricating oil tank 13.
The specified oil level of the lubricating oil tank 13 (the lubricating oil level necessary for maintaining the normal operation without oil film shortage without stopping the operation for a long time) 1
3b, a drive motor 15e for adjusting 3b, a specified oil surface 13b of the lubricating oil tank 13, and an oil film forming oil surface (a lubricating oil surface necessary for forming an oil film without operating the rotating machine) 13c. It is composed of a stop signal and an oil level detector 15f that sends a phase sequence switching signal to the drive motor 15e that is rotating forward and reverse.

Next, the operation of the present invention will be described with reference to FIG. 1 and FIG. 3 which is a control block diagram of the lubricating oil level adjusting device.

An oil film is formed on a bearing metal surface constituting a bearing surface of a radial bearing of the horizontal shaft rotating machine,
During normal operation in which starting and stopping are performed without accompanying a long-term operation stop, the oil film does not run out, so that the oil level of the lubricating oil tank 13 is sufficient up to the specified oil level 13b. .

However, if the operation is stopped for a long period of time, the oil film on the bearing metal surface disappears and the oil film is cut off. Thus, the bearing metal and the bearing of the rotating machine main shaft are damaged.

Therefore, in the present invention, when the rotating machine is stopped for a long time and the bearing metal has an oil film shortage, the lubricating oil level of the lubricating oil tank 13 is adjusted by the lubricating oil level adjusting device 15 when the rotating machine is started. Then, the rotating machine is started after the oil level is raised from the specified oil level 13b to the oil film forming oil level 13c, an oil film is formed on the bearing metal surface of the main shaft, and the lubricating oil is returned to the oil collecting tank.

Hereinafter, a lubricating oil level adjusting device 1 will be described with reference to a control block diagram shown in FIG.
The operation of No. 5 will be described in detail.

When the rotating machine is to be operated, if the operation has been stopped for a long period of time, the oil film has run out. Therefore, first, the drive motor 15e is started by the start command of the water turbine power plant, the oil return pump 15d is operated (forward rotation), and the oil collection tank 1 is started.
The lubricating oil in 5b is sent to the lubricating oil tank 13 via the oil return pipe 15c, and the oil level is raised from the specified oil level 13b to the oil film forming oil level 13c. Then, the oil level detector 15f
It operates by detecting that the lubricating oil level has reached the oil film forming oil level 13c, and gives a stop command to the drive motor 15e to stop the operation of the oil return pump 15d.

During this time, when the oil level of the lubricating oil tank 13 reaches the oil film forming oil level 13c, the bearing main body of the main shaft is immersed in the lubricating oil 13a, although not shown in FIG. Accordingly, an oil film is automatically formed on the metal surface of the bearing body, and the rotating machine can be operated. Therefore, the rotating machine is started and put into operation.

Therefore, the phase sequence of the input power of the drive motor 15e of the oil feed pump 15d is switched, and the drive motor 1e is switched.
5e is started and the oil return pump 15d is operated (reverse rotation),
The lubricating oil 13a in the lubricating oil tank 13 is sent to the oil collecting tank 15b via the oil return pipe 15c, and the oil level is changed to the oil film forming oil level 1.
3c to the specified oil level 13b.

When the oil level in the lubricating oil tank 13 drops to the specified oil level 13b, the oil level detector 15f detects that the lubricating oil level has reached the specified oil level 13c, and operates, so that the drive motor 1
A stop command is given to 5e to stop the operation of the oil return pump 15d.

When the rotating machine starts operation, the lubricating oil 13a
The oil is pumped up by the rotation of the oil disk 14a of the viscous pump 14, and the bearing portion 1 of the main shaft is supplied from the lubricating oil supply pipe 14c.
2 and thereafter, the supplied lubricating oil continuously forms and maintains an oil film on the metal surface of the bearing body. Therefore, the lubricating oil level of the lubricating oil tank 13 is no longer
An oil surface with a high c is inconvenient (a high oil surface is not preferable because it rather increases the amount of the lubricating oil 13a scattered outside the bearing box 10).

When the operation of the oil return pump 15d stops,
The phase sequence of the input power of the drive motor 15e of the oil return pump 15d is switched, and the oil return pump 1
5d is provided so as to rotate forward.

[0031]

As described above, the present invention has been described in detail. According to the present invention, a horizontal shaft rotating machine having a lubricating oil tank has:
If a lubricating oil level adjustment device that can adjust the oil level in the lubricating oil tank is added, and if there is a shortage of oil film on the bearing metal of the main shaft due to a long-term stop of the horizontal rotating machine, the rotating machine is started. Prior to this, the oil level was raised to the predetermined oil film forming oil level by the above lubricating oil level adjusting device, so that the oil film was automatically formed on the metal surface of the bearing,
Damage to the bearing metal due to running out of the oil film of the bearing can be easily prevented.

[Brief description of the drawings]

FIG. 1 is a partially cutaway front view of a horizontal shaft rotating machine to which the present invention is applied.

FIG. 2 is a partially cutaway sectional view taken along a line BB of a bearing portion of the horizontal rotating machine of FIG. 1;

FIG. 3 is a control block diagram of the lubricating oil level adjusting device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Bearing box 11 Bed of a horizontal rotating machine 12 Bearing part of a main shaft of a horizontal rotating machine 13 Lubricating oil tank 13a Lubricating oil 13b Prescribed oil level 13c Oil film forming oil level 14 Viscous pump 14a Oil disk 14b Cover 14c Lubricating oil supply pipe 15 Lubrication Oil level adjusting device 15b Oil collecting tank 15c Oil return pipe 15d Oil return pump 15e Drive motor 15f Oil level detector

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) F16C 33/66 F16N 29/02

Claims (1)

(57) [Claims] 1. A horizontal shaft rotating machine having a main shaft supported by a radial bearing and a lubricating oil tank filled with lubricating oil for lubricating the radial bearing, wherein a separate lubricating oil filled with the same lubricating oil is injected. A lubricating oil in the lubricating oil tank is connected between the oil collecting tank and the oil collecting tank and the lubricating oil tank via a return oil pipe, and the lubricating oil is transferred between the two oil tanks by forward and reverse rotation thereof. A return oil pump for adjusting the surface, and a scheduled high / low oil level of the lubricating oil in the lubricating oil tank is detected, and the forward / reverse rotation of the drive motor for driving the return oil pump is performed by the drive motor. A lubricating oil level adjusting device composed of a stop signal and an oil level detector that sends a phase sequence switching signal, and a lubricating oil level adjusting device is added. When starting the horizontal rotating machine, Rotate the oil pump forward, send the lubricating oil in the oil collecting tank to the lubricating oil tank until the lubricating oil level of the lubricating oil tank reaches the predetermined high oil level, return it to the oil collecting tank after a certain time limit, and start A radial bearing having a function of adjusting a lubricating oil level of a lubricating oil tank.