JPS6110111A - Submerged bearing - Google Patents

Abstract

PURPOSE:To improve the vibration suppressing performance by constructing a bearing with a bearing body for supporting a rotary shaft and a resilient sleeve arranged at the outercircumference of said bearing body while having plural recesses in the axial direction. CONSTITUTION:A bearing body 4, a reinforcing member 5 and a rubber sleeve 6 are provided sequentially from the inside of rotary shaft 1 on a bearing table 2. While a plurality of recesses 13 for controlling the spring function of said sleeve 6 are provided circumferentially at the inside of the sleeve 6. Said recess 13 will define a fluid path 14 together with the outercircumferential face of the reinforcing member 5. Holes 15, 16 communicatable with said flow path 14 are made through the bearing table 2 and the cover 11 facing with the upper and lower sections of the fluid path 14.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to an underwater bearing device, and more particularly to an underwater bearing device used in mixed flow pumps, sewage pumps, water turbines, and underwater motors.

[Background of the invention]

Conventionally, devices such as mixed flow pumps, sewage pumps, water turbines, and submersible motors have used underwater bearing devices to support their rotating shafts. This underwater bearing device requires lubrication, and one form of this is to lubricate the bearing by introducing fluid handled by the device into the bearing. (Japanese Utility Model Publication No. 29-17308, Japanese Utility Model Publication No. 32-16408, Japanese Patent Publication No. 40-2002) Since this type of submersible bearing device is used in a location with a small load capacity, its damping effect is small. Therefore, the rotor of the equipment is used below the critical point. However, in recent years, as equipment speeds have increased, it has become necessary to use the bearings at temperatures above the critical point, but currently there is no underwater bearing device that can sufficiently damp vibration under these usage conditions.

[Purpose of the invention]

The present invention has been made based on the above-mentioned matters, and an object of the present invention is to provide an underwater bearing device that can sufficiently exhibit vibration damping properties.

[Summary of the invention]

In order to achieve the above object, the present invention provides an underwater bearing device in which a bearing supporting a rotating shaft is lubricated by water pumped up by a pumping means provided on the rotating shaft, including a bearing body supporting the bearing; This bearing body is provided with an elastic sleeve provided on the outer circumferential surface side and has a plurality of axial recesses on the inside, thereby improving vibration damping performance.

[Embodiments of the invention]

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

1 and 2 show an embodiment of the bearing device of the present invention. In these figures, 1 is a rotating shaft, 2 is a bearing support casing, and 3 is a bearing stand provided in the bearing support casing 2. be. This bearing stand 2 is filled with phenol resin in order from the inside on the rotating shaft 1 side.

A bearing body 4 made of a material such as carbon or ceramic, and a reinforcing member 5 for the bearing body 4 made of a metal such as SUS.
and a rubber sleeve 6 are provided. The reinforcing member 5 and the sleeve 6 are fitted with a stop pin 7.8 at their lower end.
Rotation is prevented by engagement with pin holes 9 and 10 provided in the bearing stand 3, and furthermore, a cover 11 at the upper end prevents it from popping out upward. The cover 11 and the bearing stand 2 are fixed to the bearing support casing 2 by bolts 121. Inside the sleeve 6, a plurality of axial recesses 13 are provided in the circumferential direction for controlling the spring action of the sleeve 6. These four parts 13 and the outer peripheral surface of the reinforcing member 5 define a fluid passage 14 . Holes 15, 16 communicating with this fluid passage v614 are provided in the bearing pedestal 2 and the cover 11, which face the lower and upper parts of this fluid passage 14. A plurality of axial grooves 17 are provided inside the bearing body 4 . This axial groove 17 is formed between the bearing body 4 and the reinforcing member 5.
It communicates with the fluid passageway 14 by a plurality of radial holes 18 provided therein. In this example, a case is considered in which the fluid for lubricating the bearing flows from the bottom to the top as shown in FIG.

Next, the operation of one embodiment of the bearing device of the present invention described above will be explained.

Rotating shaft 1. Due to the rotation of the rotating shaft, the liquid is pumped into the first
The liquid is pumped upward from the top and bottom of the drawing. This liquid passes through the gap between the rotating shaft 1 and the bearing body 4 and the axial groove 17 and lubricates the bearing body 4. Further, a part of the liquid that has flowed into the axial groove 17 flows out into the fluid passage 14 through the radial hole 18 due to the centrifugal force caused by the rotation of the rotating shaft 1 . Therefore, slurry such as dirt, rust, and sand contained in the liquid is discharged to the outside of the bearing. Therefore, the inner circumferential surface of the bearing body 4 is always kept clean, and wear and seizure due to intrusion of dust do not occur. Also, pumped liquid flows into the fluid passage 14 through the hole 15 and combines with liquid from the radial hole 18 and then flows out through the hole 16. Thereby, the bearing body 4 can be actively cooled and the seizure resistance of the bearing can be improved.

Further, when the rotational speed of the rotating shaft 1 increases and reaches a state close to or exceeding a critical point.

Although vibration occurs in the rotating shaft 1, this vibration is damped by the spring action of the sleeve 6 and its internal damping action, thereby damping the rotating shaft 1 and the rotating body provided thereon. At this time, minute movements of the reinforcing member 5 and the sleeve 6 for exerting the vibration damping effect are suppressed by the engagement of the stopper pins 7.8 with the pin holes 9 and 10. Therefore, the rotating shaft 1 can be rotated even in the supercritical region. Further, since the sleeve 6 is made of rubber, its deformation can prevent uneven contact between the rotating shaft 1 and the bearing body 4. Further, the problem of corrosion of the sleeve 6 does not occur.

3 and 4 show other embodiments of the bearing device of the present invention, and in these figures, the same reference numerals as those in FIGS. 1 and 2 indicate the same or corresponding parts. be. This embodiment differs from the embodiment shown in FIG. 1 in that the reinforcing member 5 of the bearing body is removed. That is, the bearing is composed of a bearing body 19 and a rubber sleeve 2Q bonded and fixed to the outer peripheral surface of the bearing body 19, and this bearing is fixed to the bearing support casing 2 by press fitting or adhesive. As the bearing body 19, phenol resin, carbon, ceramic, etc. can be used. According to this embodiment, by increasing the strength of the bearing body 19, there is no need to provide a reinforcing member on the outer periphery of the bearing body 19, and the bearing device can be constructed simply, and as shown in FIG. It is possible to achieve the same effects as in the embodiment shown in FIG.

FIG. 5 shows still another embodiment of the bearing device of the present invention, and in this figure, the same reference numerals as those in FIGS. 3 and 4 indicate the same or corresponding parts. This embodiment consists of a rubber sleeve 20A having an annular notch 21 in the axially inner middle part, and the upper and lower parts of the sleeve 20A each have a length Q with respect to the outer circumference of the bearing body 19. This constitutes a contact part. With this configuration, the rigidity of the sleeve 20A can be changed, so the vibration damping force can be changed. Furthermore, the provision of the notch 21 allows for even better removal of foreign matter.

FIG. 6 shows another embodiment of the bearing device of the present invention,
In this figure, parts with the same symbols as those shown in FIG. 5 are the same parts. In this embodiment, rubber sleeves 20B and 20C are provided on the upper and lower outer peripheries of the bearing body 19, respectively. With this configuration, effects similar to those of the embodiment shown in FIG. 5 can be achieved.

FIG. 7 shows still another embodiment of the bearing device of the present invention, and in this figure, the same reference numerals as those in FIG. 3 are the same parts. In this embodiment, an axial groove 22 is formed on the outer periphery of the sleeve 20 in a staggered manner with respect to the axial groove 17 on the inside thereof.
It has been established.

With this configuration, the sleeve 20 can be easily bent, its rigidity can be reduced, and the damping force can be changed.

FIG. 8 shows another embodiment of the bearing device of the present invention.
In this figure, parts with the same symbols as those in FIG. 3 are the same parts. In this embodiment, in order to increase the vibration damping force, a minute gap 23 is formed on the inner periphery of the sleeve 20, and a squeeze film action section is formed in this minute gap 23.

With this configuration, in addition to the damping action of the sleeve 20, the damping action of the squeeze film produced in the minute gap 22 works, making it possible to greatly increase the damping effect. In this case, the damping effect can be adjusted as desired by changing the circumferential length and amount of the gap of the minute gap 23.

FIG. 9 shows another embodiment of the bearing device of the present invention,
In this figure, parts with the same symbols as those in FIG. 3 are the same parts. In this embodiment, in order to further increase the damping effect in the embodiment shown in FIG.
was formed.

FIG. 10 shows still another embodiment of the bearing device of the present invention, and in this figure, the same reference numerals as those in FIG. 3 are the same parts. In this embodiment, minute gaps 25 and 26 are formed in the bearing body 19 and the bearing support housing 2 with which the sleeve 20 comes into contact, respectively, to exert a squeeze film effect. Even with this configuration, the damping effect can be greatly exerted as in the embodiment shown in FIG.

In the embodiment described above, a plurality of radial holes 18 were provided in the axial groove 17 in order to discharge foreign matter, but as shown in FIG. A long hole 26 may be provided. In addition, as shown in FIG. 12, in order to prevent foreign matter from entering the bearing surface of the bearing body 19, the radial hole 18 is placed in the axial groove 17 on the near side with respect to the rotation direction A of the rotating shaft 1. It is also possible to provide one. Further, in the embodiments shown in FIGS. 3 to 10, the sleeves 19, 19A, 19B, and 19G are fixed to the bearing support casing 2 by press fitting or adhesive.
It is also possible to configure the bearing to be supported by a bearing stand as in the embodiment shown in FIGS.

Further, in the above-described embodiment, the bearing body 18 is formed as a perfect circular bearing, but it is also applicable to non-perfect circular bearings such as three arcs, four circular arcs, etc., and furthermore, it is applicable to ball bearings. Further, the sleeve is not limited to rubber, and similar materials can also be used.

〔Effect of the invention〕

As described above, according to the present invention, it is possible to provide an underwater bearing device with good vibration damping properties, so that equipment using this bearing equipment can be operated until exceeding the critical region, and the equipment can be operated This allows the area to be expanded significantly.

[Brief explanation of drawings]

FIG. 1 is a plan view showing one embodiment of the bearing device of the present invention with a part missing, FIG. FIG. 4 is a longitudinal sectional view thereof, FIGS. 5 and 6 are longitudinal sectional views showing further embodiments of the bearing device of the present invention, and FIGS. 7 to 10 are respectively longitudinal sectional views. FIGS. 11 and 12 are a plan view showing another embodiment of the bearing device of the present invention with a portion thereof cut out, and FIGS. 11 and 12 are front views showing other examples of radial holes used in the bearing device of the present invention, respectively. be. 1... Rotating shaft, 2... Bearing support casing, 3...
・Bearing stand, 4... Bearing body, 5... Reinforcement member, 6...
- Sleeve, 13... recess, 14... fluid passage, 1
5.16... Hole, 17... Axial groove, 18... Radial hole, 19... Bearing body, 20.2OA, 20B
, 20C...Sleeve, 21...Notch, 22...
・Axial groove, 23, 24° 25.26...minor gap.

Claims (1)

[Scope of Claims] 1. An underwater bearing device in which a bearing supporting a rotating shaft is lubricated by pumped water lifted up by a pumping means provided on the rotating shaft, wherein the bearing is provided with a bearing body supporting the rotating shaft; 1. An underwater bearing device comprising an elastic sleeve provided on the outer peripheral surface of a bearing body and having a plurality of axial recesses inside. 2. The underwater bearing device according to claim 1, wherein the bearing body and the elastic sleeve are separate bodies, and are fixed to a bearing stand so that they do not rotate. 3. The underwater bearing device according to claim 1, wherein the bearing body and the elastic sleeve are integrally formed and fixed to a bearing support housing. 4. The underwater bearing device according to claim 2 or 3, wherein the elastic sleeve has an axial recess formed on the outer periphery of the elastic sleeve, in contrast to the axial recess provided inside the elastic sleeve. Underwater bearing device. 5. The underwater bearing device according to any one of claims 2 to 4, characterized in that the elastic sleeve is provided on the bearing body side with a minute gap portion that exhibits a squib film action. Bearing device. 6. In the underwater bearing device according to any one of claims 2 to 5, a minute gap is provided between the elastic sleeve and the member supporting it, which exhibits a squeeze film effect. An underwater bearing device characterized by: