JP2004068598A - Collecting device of bearing lubrication grease in underwater rotary machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a collecting device of bearing lubrication grease in an underwater rotary machine capable of making use of lubrication grease for a long time effectively without waste, by automatically returning grease for the bearing side even when grease filled up in the bearing would flow down owing to the ambient thermal effect, maintaining long lifetime and stable bearing properties, and being manufactured simply in structure, low in cost, and excellent also in maintainability. <P>SOLUTION: In the undersurface of the bearing 2 filled up with grease for lubrication, an annular spacing 6 is held on the uppersurface of a bearing bracket bottom 3u inserted with a rotary shaft 1. In the spacing 6, an operating table 7 corotating with the rotary shaft 1 is traversed directly below the bearing 2. More suitably, a tilted surface 7t with an up gradient for the rotational direction is formed on the uppersurface of the operating table 7. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a bearing lubricating grease picking device for a rotary machine installed and used in water, such as a submersible electric pump and an aeration / stirring device.
[0002]
[Prior art and its problems]
Grease is used as a lubricant for bearings in rotating machines used underwater, such as underwater electric pumps and aeration / stirring devices. Shielded bearings in which lubricating grease is sealed in the bearing itself are also commercially available. However, the amount of grease enclosed is also small, and when used, the viscosity of the grease is reduced due to the influence of the surrounding heat, etc., and it becomes a fluid state, the sealing effect of the bearing shield is significantly reduced, and the grease enclosed inside is reduced. It will escape and lose lubrication. Therefore, conventionally, a method has been adopted in which grease is replenished from the grease nipple 111 at appropriate times using an open-type bearing 102 as shown in FIG. Since it is not desirable to discharge the grease flowing out under the influence of the above-mentioned heat into the water due to environmental problems, a grease storage chamber 106 having a storage capacity of a fixed capacity is provided directly below the open-type bearing 102 inside the device. However, it is not only a manufacturing problem that a space and a structural addition are required for that purpose, but also the grease that has fallen and accumulated in the grease collecting chamber 106 must be periodically collected and removed. In order to remove the accumulated grease, it is necessary to disassemble the apparatus by lifting the apparatus to the ground and removing the motor frame 112, the bearing bracket 103, and the like.
[0003]
Further, as another known example, as disclosed in Japanese Patent Application Laid-Open No. 8-303472, it has been proposed to fix a fixing ring having a concave portion serving as a grease reservoir on an upper surface directly below a bearing as grease drop prevention means. . However, this fixing ring needs to have a water-tight structure on the sliding contact surface with the rotating side, which complicates the structure and requires high-precision assembly and high grease viscosity. In this state, it is inevitable that the viscosity of the grease is reduced due to the heat generated by the motor, the temperature of the surrounding liquid, or the heat generated by the sliding of the bearing itself. Therefore, the desired effect of preventing the grease from falling cannot be expected. The grease collected must be periodically collected and removed. In order to collect and remove the grease, a disassembling operation such as lifting the device to the ground and removing the motor frame, the bearing bracket, and the like is necessary as in the case shown in FIG.
[0004]
[Object of the invention]
It is an object of the present invention to automatically return the lubricating grease filled in a bearing of a submersible pump or the like to the bearing side even if the lubricating grease is softened due to thermal influences during operation and flows down, without waste and effective for a long time. A bearing lubrication grease device for underwater rotating machinery that can utilize lubricating grease, maintains stable bearing characteristics with a long service life, is simple in structure, can be manufactured at low cost, and has excellent maintainability. To provide.
[0005]
Configuration of the Invention
In the apparatus for picking up bearing lubricating grease in a submersible rotating machine according to the present invention, a gap is formed by fitting a plurality of rotators between opposed surfaces of a bearing inner ring statically fitted to a rotating shaft and a bearing outer ring statically fitted to a bearing bracket. On the lower surface of the bearing filled with lubricating grease, an annular space is held on the upper surface of the bearing bracket bottom plate through which the rotating shaft is inserted, and an operating plate that rotates integrally with the rotating shaft in the space is provided in the bearing. Place it directly below.
It is preferable that an upper surface of the operation panel is formed with an inclined surface having an upward slope in the rotation direction of the rotation shaft.
[0006]
[Action]
When the submersible rotating machine is driven, the operation panel also rotates with the rotation of the rotating shaft, and the lubricating grease filled in the bearing softens due to the heat of the surroundings and tends to flow downward, but rotates with the rotating shaft. It is returned upward by the lift action generated on the upper surface of the operating panel. When the upper surface of the operation panel is formed as an inclined surface having an upward slope in the rotation direction, a stronger lifting action is generated.
[0007]
【Example】
This will be described below with reference to the embodiment shown in FIGS.
[0008]
Reference numeral 1 denotes a rotating shaft in a submersible rotating machine, and 2 denotes a bearing for supporting the rotating shaft 1. A plurality of bearings are provided between opposing surfaces of a bearing inner ring 2i fixed to the rotating shaft 1 and a bearing outer ring 2o fixed to the bearing bracket 3. The lubricating grease is filled in the gap 5 by fitting the trochanters 4. Reference numeral 3u denotes a bearing bracket bottom plate through which the rotating shaft 1 is inserted. An oil seal 13 for preventing grease from leaking is attached to the fitting portion of the rotating shaft 1. Numeral 6 denotes a space held between the upper surface of the bottom plate 3u and the lower surface of the bearing 1. Numeral 7 denotes an operation panel fitted to the rotary shaft 1 so as to be located immediately below the bearing 2 in the space. It is fixed horizontally with the washer 8 and the tightening nut 9 and is horizontally mounted so as to rotate integrally with the rotating shaft 1, and controls an operation of returning the grease flowing down by a lifting action. In order to enhance the above-mentioned scooping function, it is desirable that the upper surface of the operation panel 7 be formed as an uneven surface or be formed as an inclined surface 7t having an upward slope in the rotation direction. Reference numeral 10 denotes a presser cover mounted from above the bearing 2, reference numeral 11 denotes a grease nipple for supplying lubricating grease to the bearing 2, and reference numeral 12 denotes a motor frame mounted on the bearing bracket 3.
[0009]
When a submersible rotary machine such as a submersible electric pump or an aeration / stirring device is driven, the operation panel 7 rotates with the rotation of the rotary shaft 1 and a lift action is generated on the upper surface thereof. The lubricating grease filled in the bearing 2 is softened by the influence of the surrounding heat and tends to flow downward. However, the lubricating grease is returned upward by the above-mentioned lifting action generated on the upper surface of the operation panel 7. Therefore, the lubricating grease is effectively used for a long period of time without waste and maintains stable bearing characteristics. The lubricating grease is filled from the upper surface of the bearing 2 through the grease nipple 11, but unlike the conventional method in which the lubricating grease continues to flow during the operation of the underwater rotary machine, the lubricating grease returned upward is reused. In the case of the apparatus of the present invention, it is not necessary to replenish grease for a long period of time.
[0010]
【The invention's effect】
According to the present invention, even if lubricating grease filled in a bearing of a submersible pump or the like softens due to thermal influence during operation and tries to flow down, it is automatically returned to the bearing side and effectively used for a long time without waste. A bearing lubrication grease device for underwater rotating machinery that can utilize lubricating grease, maintains stable bearing characteristics with a long service life, is simple in structure, can be manufactured at low cost, and has excellent maintainability. Can be configured.
[Brief description of the drawings]
FIG. 1 is a vertical sectional side view of a main part of a submersible electric pump to which the device of the present invention has been applied.
FIG. 2 is an enlarged view of a main part of FIG.
FIG. 3 is a plan view of an operation panel in the device of the present invention.
FIG. 4 is a side elevational view of an operation panel in the device of the present invention.
FIG. 5 is a vertical sectional side view of a main part of a conventional submersible electric pump on which the device of the present invention is not applied.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Rotating shaft 2 Bearing 2i Bearing inner ring 2o Bearing outer ring 3 Bearing bracket 3u Bearing bracket bottom plate 4 Roller 5 Void 6 Annular space 7 Operation panel 7t Inclined surface

Claims (2)

On the lower surface of the bearing in which a plurality of trochanters are fitted between opposing surfaces of the bearing inner ring that fits with the rotating shaft and the bearing outer ring that fits with the bearing bracket, and the gap is filled with lubricating grease, the lower surface of the bearing is fitted with the rotating shaft. A bearing in a submersible rotary machine, wherein an annular space is held on the upper surface of the bottom plate of the bearing bracket through which the operation plate rotates, and an operating panel that rotates integrally with the rotating shaft is provided beneath the bearing in the space. Lubricating grease picking device. The bearing lubricating grease lifter for a submersible rotary machine according to claim 1, wherein an inclined surface having an upward slope is formed on an upper surface of the operation panel in a rotation direction of the rotation shaft.

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