JP2508554Y2 - Bearing lubrication device for rotating machinery - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for lubricating a vertical shaft pump and other bearings for supporting a main shaft of a vertical rotary machine used underwater, and more particularly to a rotary machine for ensuring reliable lubrication at start-up. Bearing lubrication device

[0002]

2. Description of the Related Art FIG. 9 shows the overall structure of a vertical shaft pump. In FIG. 9, a main shaft 2 is supported by a plurality of vertically arranged bearings 3 at the center of a vertically long casing 1. These bearings 3 are, for example, ceramic bearings. Further, above the uppermost bearing 3, there is provided a seal portion 4 for axially sealing the penetrating portion of the main shaft 2 to the atmosphere to prevent the discharge water from leaking to the atmosphere side.

During pump operation, the main shaft 2 rotates to pump water from the discharge pipe 5 of the casing 1, and the bearing surface of the bearing 3 is water-lubricated by a part of the pumped water.

Next, FIG. 10 shows in detail the structure of the bearing 3 described above. In FIG. 10, a bearing housing 6 supported by a casing 1 is attached to a retainer 8 via an elastic ring 7.
A ceramic bearing member 9 is supported on the retainer 8.

Further, FIG. 11 shows the structure of the above-mentioned seal portion 4 in detail. In FIG. 11, the seal portion 4 includes a seal box 10 and a plurality of seals 11. The seal box 10 is arranged above the uppermost bearing 3 and is supported by the discharge pipe 5 of the casing 1. Further, the plurality of seals 11 are carried by the seal box 10, and the main shaft 2
And the seal box 10.

[0006]

However, in the conventional bearing mechanism described above, it may take a long time from the start of the pump until the discharge water is pumped up. Therefore, during this period, if the bearing surface 12 (see FIG. 10) of the bearing 3 is not water-lubricated by pumping, a long dry state continues,
The bearing temperature rises, causing seizure and wear on the bearing.

The present invention has been made in order to solve the above-mentioned problems of the prior art, and does not cause seizure or wear of the bearing even when the bearing is started under dry conditions without pumping for a long time. An object of the present invention is to provide a bearing lubrication device for a rotary machine.

[0008]

In order to solve the above problems, the present invention relates to a rotary machine which supports a vertically long main shaft by a plurality of vertically arranged bearings, wherein the pump is pumped when the main shaft rotates. In a bearing lubricating device for a rotary machine that lubricates a bearing with water, a water storage tank for storing pumped water is provided above the bearing, and a water passage hole is provided in the water storage tank along the periphery of the main shaft, and the main shaft is provided with the main shaft. Is provided with a valve that closes the water passage hole at the time of stop and opens the water passage hole by centrifugal force when the main shaft rotates.

[0009]

According to the above means, when the main shaft rotates, the valve opens the water passage hole by the centrifugal force, and the water in the water storage tank flows down by its own weight and is supplied to the bearing. As a result, the bearing is lubricated even at the time of start-up under dry conditions without pumping for a long time. Therefore, the bearing is satisfactorily lubricated even under dry conditions, and seizure or wear does not occur on the bearing.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Some embodiments of the present invention will be described in detail below with reference to FIGS. In these figures, the same parts as those of the conventional one shown in FIGS. 9 to 11 are designated by the same reference numerals, and the duplicated description will be omitted.

1 and 2 show a first embodiment of the present invention. According to this embodiment, the uppermost bearing 3 and the seal portion 4
A water storage tank 20, which is integrally formed with the seal box 10 and is supported by the discharge pipe 5 of the pump casing, is annularly provided so as to surround the main shaft 2. The water storage tank 20 is provided with a partition plate 22 having water passage holes 21 along the circumference of the main shaft 2.

Further, the main shaft 2 is provided with a valve 24 which closes the opening 23 of the water passage hole 21 when the main shaft 2 is stopped and opens the water passage hole 21 by its centrifugal force when the main shaft 2 rotates. . That is, this valve 24 includes a valve body 26 having a lip 25 made of an elastic material, as shown in detail in FIG. 2, and the valve body 26 is supported with the end portion of the lip 25 inclined downward. 2 is attached by a band 27 to the upper end surface of the collar 28 of the water storage tank 10 in which the opening 23 of the water passage hole 21 is located, and the lip 25 closes the opening 23 of the water passage hole 21. ing.

Further, as shown in FIG. 1, the water storage tank 20.
A pocket 29 for accumulating foreign matter is provided in the lower part of the. Therefore, the foreign matter contained in the discharged water is retained in the pocket 29. Further, as shown in FIG. 2, the valve body 26 is provided with a pressure equalizing hole 30 that communicates the upper and lower sides thereof.

When the main shaft 2 rotates, the lip 25 of the valve 24 is brought into a substantially horizontal state by the centrifugal force thereof as shown by the broken line in FIG. 2, and the opening 23 of the water passage hole 21 is opened to store water. It is supplied from 20 to the bearing surface 12 of the bearing 3 by its own weight. As a result, the bearing 3 is lubricated.

Therefore, the bearing 3 is lubricated even when it is started under a dry condition without pumping for a long time, and the bearing 3 is well lubricated, so that the bearing 3 is not seized or worn.

Next, FIGS. 3 and 4 show a second embodiment of the present invention. In this embodiment, the valve 24 has a lip 25.
The valve body 26 having a contact with the bottom wall of the water storage tank 20,
The water passage hole (gap) 21 formed around the main shaft 2 is directly closed.

When the main shaft 2 rotates, the centrifugal force thereof causes the lip 25 to be in a substantially horizontal state as shown by a broken line, the water passage hole 21 is opened, and the water from the water storage tank 20 is borne by its own weight. Is supplied to. As a result, the bearing 3 is lubricated.

Next, FIG. 5 shows a third embodiment of the present invention.
In the present embodiment, the water storage tank 20 is provided above the seal portion 4, and the discharge pipe 5 of the casing is provided by the external water passage pipe 31.
Is communicated to. In addition, the water passage hole 21 of the water storage tank 20
Is opened downward, and the lip 25 of the valve 24 is inclined upward so as to abut the lower surface of the tank.

When the main shaft 2 rotates, the lip 25 of the valve 24 is brought into a substantially horizontal state due to the centrifugal force, and the opening 23 of the water passage hole 21 is opened to allow the water to flow from the water storage tank 20 to the bearing of the bearing 3 by its own weight. It is supplied to the surface 12. As a result, the bearing 3 is lubricated.

Next, FIG. 6 shows a fourth embodiment of the present invention.
This embodiment is a modification of the third embodiment shown in FIG. 5, in which a water storage tank 20 is provided around the seal portion 4. Since the other points are the same as those in FIG. 5, duplicate description will be omitted.

Next, FIG. 7 shows a fifth embodiment of the present invention. In the present embodiment, in addition to the structure of the first embodiment shown in FIG. Lubricates the lower bearing 3. In addition, at the time of pumping, the water is transferred to the water storage tank 20 through the water conduit 32.
Flows into and is stored. Since other configurations are the same as those in FIG. 1, duplicate description will be omitted.

Finally, FIG. 8 shows the operation of the fifth embodiment shown in FIG. 7 during operation. When the main shaft 2 is started to rotate, the lip 25 of the valve 24 is brought into a substantially horizontal state due to the centrifugal force, the water passage hole 21 of the water storage tank 20 is opened, and the water storage tank 2
0 of water is passed through the upper bearing 3 and the water conduit 32 to each bearing 3
It is supplied in a fixed amount to the bearing surface 12 of and acts as lubricating water.
As a result, the dry state of the bearing surface is prevented and the lubrication of the bearing surface is maintained well until the pumping.

During normal operation, the discharge pipe 5 and the water storage tank 20 communicate with each other, water is introduced into the water storage tank 20 to store water, and the main shaft 2 stops rotating and the lip 2 of the valve 24 is stopped.
5 hangs down and closes the water passage hole 21 of the water storage tank 20 to prepare for the next start.

[0024]

As described above, according to the present invention, the valve for opening the water passage hole of the water storage tank by the centrifugal force due to the rotation of the main shaft is provided, whereby the water in the water storage tank flows down by its own weight. Since it is supplied to the bearing, the bearing is well lubricated even when it is started under a dry condition without pumping for a long time, and seizure or wear of the bearing does not occur.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing a bearing lubrication device for a rotary machine according to a first embodiment of the present invention.

FIG. 2 is an enlarged view of a main part of FIG.

FIG. 3 is a vertical cross-sectional view showing a bearing lubrication device for a rotary machine according to a second embodiment of the present invention.

FIG. 4 is an enlarged view of a main part of FIG. 3;

FIG. 5 is a vertical cross-sectional view showing a bearing lubricating device for a rotary machine according to a third embodiment of the present invention.

FIG. 6 is a vertical cross-sectional view showing a bearing lubricating device for a rotary machine according to a fourth embodiment of the present invention.

FIG. 7 is a vertical cross-sectional view showing a bearing lubricating device for a rotary machine according to a fifth embodiment of the present invention.

FIG. 8 is an operation explanatory view of the fifth embodiment shown in FIG. 7 during operation.

FIG. 9 is a schematic cross-sectional view showing the overall structure of a vertical shaft pump.

10 is an enlarged sectional view showing a bearing portion of FIG. 9. FIG.

FIG. 11 is an enlarged cross-sectional view showing a bearing and a seal portion of FIG. 9.

[Explanation of symbols]

 1 casing 2 main shaft 3 bearing 5 discharge pipe 12 bearing surface 20 water storage tank 21 water passage hole 24 valve 31 external water passage pipe 32 water conduit

Claims (1)

(57) [Scope of utility model registration request] 1. A bearing lubrication device for a rotary machine, comprising: a vertical main shaft supported by a plurality of vertically arranged bearings; and a bearing lubrication device for the rotary machine, wherein the bearing is water-lubricated by pumping water when the main shaft rotates. A water storage tank for storing pumped water is provided in the water storage tank, and a water passage hole is provided in the water storage tank along the circumference of the main shaft, and the main shaft is closed by the water passage hole when the main shaft is stopped. A bearing lubricating device for a rotary machine, comprising a valve for opening the water passage.