JPH0583394U - Buffer rubber for submersible bearings - Google Patents

Abstract

(57) [Summary] [Purpose] In a hollow disk-shaped cushioning rubber, the lack of flexibility due to the rigidity of the flat rubber is compensated for, and displacement in the radial and axial directions is absorbed to improve the follow-up mobility. Improves and eliminates adhesion between ceramic bearings and rubber. [Structure] In a hollow disk-shaped cushioning rubber 3, a plurality of convex projections 3B are integrally formed radially on one surface of a flat plate surface portion 3A thereof at equal intervals in the circumferential direction. Use the part as a presser foot in the axial direction.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to the shape of rubber used for cushioning submerged bearings, especially ceramic bearings of vertical pumps.

[0002]

[Prior Art]

 Rubber bearings are often used in vertical pumps, but dry operation of rubber bearings is not allowed, so lubricating water must be constantly supplied during operation. In particular, in the case of vertical pumps used in nuclear power plants, it is the actual situation that lubricating water is supplied to the rubber bearings even when the pumps are stopped, in case of trouble.

For this reason, a ceramic bearing capable of dry operation is used, but a ceramic bearing lacks flexibility and followability like a rubber bearing. Therefore, when a ceramic bearing is used, as shown in FIG. 6, a cushioning rubber 3 is provided above and below the ceramic bearing 2 fitted on the vertical shaft 1 of the vertical pump, and an O-ring 4 is provided on the side surface of the bearing, so It is compatible with tracking and tracking. Further, according to the conventional example, a hollow disk-shaped flat rubber is used as the buffer rubber 3.

[0004]

[Problems to be solved by the device]

 As described above, according to the conventional example, the submersible bearing cushioning rubber 3 has a large contact area because it is a flat rubber, and lacks flexibility due to the friction fixing force and the large rigidity of the rubber, and particularly the bearing in the radial direction. It is easy to impede the following mobility and the following characteristics when the bearing is tilted. Further, although the O-ring 4 is inserted in the radial direction, if the axial fixing force is too strong, the frictional resistance makes it difficult to follow the radial movement.

Further, since the contact area of the cushioning rubber 3 is large and the frictional fixing force is large, the ceramic bearing 2 and the cushioning rubber 3 adhere to each other, impairing the disassembly / assembly property.

The present invention has been made in order to solve the problems of the prior art, and compensates for the lack of flexibility due to the rigidity of the flat rubber plate, and absorbs the displacement in the radial direction and the axial direction. It is an object of the present invention to provide a buffer rubber for a submersible bearing, which has excellent follow-up mobility and which can also eliminate adhesion between the ceramic bearing and rubber, and can be easily disassembled and assembled.

[0007]

[Means for Solving the Problems]

 In order to solve the above problems, the present invention provides a hollow disk-shaped underwater bearing cushioning rubber in which a plurality of convex projections are circumferentially equidistantly arranged on one surface of a flat plate surface portion. It is integrally formed radially.

[0008]

[Action]

 According to the above means, by using the convex projection portion of the cushioning rubber as the axial pressing member, the convex portion of the projection is inclined and deformed against the radial load of the ceramic bearing. By doing so, and with respect to the axial load, the convex portion of the projection swells and absorbs this, so that the following mobility is greatly improved.

In addition, since the bump rubber has only the top surface of the protrusion of the projection in contact with the ceramic bearing, the contact area is small and the friction fixing force is small, so that the ceramic bearing and the cushion rubber are prevented from adhering to each other. Therefore, disassembling and assembling becomes good.

[0010]

【Example】

 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. 1 is a plan view of a buffer rubber for a submersible bearing according to this embodiment, and FIG. 2 is a sectional view taken along the line AA of FIG.

In these drawings, the cushioning rubber 3 is in the shape of a hollow disc and has a flat plate surface portion 3A as in the conventional case. Several (8 in this embodiment) convex protrusions 3B are radially and integrally formed at equal intervals in the circumferential direction.

Therefore, when the convex projection 3B of the cushioning rubber 3 is used as an axial presser, and the axial load F acts as shown in FIG. 3, the projection 3B is pressed vertically in the arrow direction. It swells to both sides as shown by the dotted line and moves following. Further, as shown in FIG. 4, when a radial load F ′ is applied, the projection 3B is inclined in the arrow direction and follows the movement as shown by the dotted line.

Further, since the cushion rubber has only a contact with the top surface of the protrusion of the projection and the ceramic bearing, the contact area is small and the friction fixing force is small, so that the ceramic bearing and the cushion rubber are prevented from adhering to each other. Therefore, disassembling and assembling becomes good.

FIG. 5 shows another embodiment of the present invention in which the adhesion between the ceramic bearing and the buffer rubber is more effectively prevented. That is, according to the present embodiment, by adhering tetrafluoroethylene (trade name: Teflon) to the top surface of the convex protrusion 3B of the buffer rubber 3, it is more effective to adhere the ceramic bearing and the rubber. The dismantling and assembling work is further improved by the effective prevention.

[0015]

[Effect of the device]

 As described above, according to the present invention, in the hollow disc-shaped buffer rubber for underwater bearings, by providing a plurality of convex protrusions integrally on one surface of the flat portion, the flexibility due to the high rigidity of the flat rubber It compensates for the lack of flexibility, absorbs displacement in the radial and axial directions, improves follow-up mobility, and eliminates the adhesion between the ceramic bearing and rubber, which facilitates disassembly and assembly. The result is good, and therefore the effect of contributing to the improvement of product quality is great.

[Brief description of drawings]

FIG. 1 is a plan view showing an embodiment of a buffer rubber for an underwater bearing according to the present invention.

FIG. 2 is a sectional view taken along the line AA of FIG.

FIG. 3 is a diagram showing a modification of the cushioning rubber of FIG.

FIG. 4 is a view showing another modification of the cushion rubber of FIG.

5 is a cross-sectional view showing another embodiment of the present invention taken along the line AA of FIG.

FIG. 6 is a cross-sectional view showing a ceramic bearing using a conventional cushioning rubber.

[Explanation of symbols]

 3 Buffer rubber 3A Flat plate surface part 3B Protrusion 5 Tetrafluoroethylene

Claims (1)

[Scope of utility model registration request] 1. A cushioning rubber for a submerged bearing in the form of a hollow disk, characterized in that a plurality of convex projections are radially integrally formed on one surface of a flat plate surface portion at equal intervals in the circumferential direction. Shock absorbing rubber for underwater bearings.