JPH03157512A - Tilting pad-shaped radial bearing - Google Patents

Abstract

PURPOSE:To contrive improvement of bearing load capacity by providing a tapered hole, with the point tapered toward a rotary shaft, in the back metal of a bearing and filling the tapered hole partly with the sliding material of the bearing to integrally form the back metal with the sliding material so as to improve its close adhesion while eliminating unstability by collision of lubricating oil. CONSTITUTION:Many tapered holes 301 are formed being tapered toward a pump shaft 16 in the back metal 31 of a radial bearing, and one-unit structure is formed by molding a sliding material 30 in each tapered hole 301. Consequently, tapered protrusions 302 are formed in peripheral and axial directions in the sliding material 30, and by these protrusions 302, fall-off of the sliding material 30 is prevented by wedge action of the protrusion. Also the root part of the protrusion 302 receives shearing force as a force in the tangential direction, and the tapered holes 301 are distributed in the total surface, consequently, local exfoliation of the back metal 31 and the sliding material 30 is prevented. A tapered surface 303 is formed in the inflow port of lubricating oil 36 in a clearance between a pad 29 and a pump shaft 16, and even when the lubricating oil 36 collides against the pad 29, an inflow of the oil can be smoothly performed with none of unstable vibration generated.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a tail extension pad type radial bearing.

[Conventional technology]

The conventional tail extension pad type radial bearing is
As disclosed in Japanese Patent No. 0-101314, a plurality of pads are arranged in a pad support, and the pad, pad support, and housing are arranged to support a rotating shaft. The pad support and pad are pivotally positioned.

The pad is divided into a metal backing that carries the load, and a component that takes into consideration its movement with the rotating shaft. In order to fix the back metal and the moving material, the back metal is dovetailed in the axial direction to restrain the moving material, while in the circumferential direction, there are multiple It was fixed with a bolt.

[Problem to be solved by the invention]

The above conventional technology has considered the restraint of the backing metal and the moving material, but does not consider the adhesion between the backing metal and the moving material, and the restraint of the backing metal and the moving material is limited to the dovetail groove and the pin. Since the material is locally restrained, parts other than that material may separate from the backing metal and the moving material. In particular, this peeling becomes noticeable when resin is used as the moving material.

An object of the present invention is to provide a tail-tipped radial bearing that improves the adhesion between the pad backing and the moving material, eliminates unstable forces caused by lubricating fluid, and improves the bearing load capacity.

[Means to solve the problem]

In order to achieve the above object, the tail extending pad type radial bearing of the present invention includes a tail extending pad type radial bearing including a backing metal and an auxiliary material, the backing metal having a plurality of tapers tapering toward the rotating shaft. The method is characterized in that a hole is provided, a part of the brewing aid material is filled in the tapered hole, and is integrated with the brewing aid material.

[Effect]

The tail extended pad type radial bearing of the present invention includes a backing metal and a auxiliary material, the backing metal has a number of tapered holes that taper toward the rotating shaft, and the resin that is the auxiliary material is molded into the tapered holes. , has an integrated structure. Because the hole is tapered, the movement of the melting aid material peeling off from the backing metal is restrained by a wedge effect, and the protrusion formed on the mold part of the melting aid material toward the tapered hole is restrained by the tangential force. The roots receive the shearing force.

〔Example〕

The structure of the bearing section of the present invention will be explained based on FIGS. 1 and 2. FIG. 1 is a cross-sectional view of an embodiment of the tail extension pad type radial bearing of the present invention, and FIG. 2 is a cross-sectional view of the expansion aid shown in FIG. 1.

In order to support the rotating shaft 16, a plurality of pad supports 32, 33 and pads 29 are arranged in the housing 35. Pad 29 is sandwiched between pad supports 32, 33 by b'%. The pad 29 and the pad support 32 are made by drilling a hole 311 in the pad support 32 and inserting the pad support 3 into the pad support 3.
Positioning is carried out by inserting a hole 311 into the head of the pivot 34 attached to 2. The pad 29 is composed of a metal backing 31 that receives the external force of the pump shaft 16, and a sliding material 30 that takes into consideration the sliding properties of the pad 29 with respect to the pump shaft 16. Resin is used as the material for the auxiliary material 30.

The back metal 31 is provided with a large number of tapered holes 301 that taper toward the pump shaft 16.
The shape is such that it can be filled by molding into 1.

FIG. 3 is a partial perspective view of only the molding aid 30 made of resin to be molded. Shiyuu aid material 30 is back money 3
1, a tapered protrusion 302 is formed on the auxiliary material 30.

A large number of protrusions 302 are formed in the circumferential direction and the axial direction. The plurality of tapered protrusions 302 prevents the phenomenon of the spreading aid 30 being pulled out by its wedge action, and in response to tangential forces, the bases of the protrusions 302 receive shearing force. Also, because the tapered holes 301 are distributed over the entire surface.

Local peeling of the back metal 31 and the auxiliary material 30 can be prevented. A tapered surface 303 is attached to the welding aid 30 at the inlet portion of the lubricant 36 in the gap between the pad 29 and the pump shaft 16. The tapered surface 303 is an inclined surface of 45 degrees or less with respect to the tangential direction, suppresses unstable vibrations that occur in the pad 29 even if the lubricant 36 collides with the pad 29, and
The lubricating liquid 36 is made to easily flow into the gap between the lubricant 6 and the auxiliary material 30.

An example of the use of the present invention will first be described with reference to FIGS. 5 and 6.

FIG. 5 is a cross-sectional view of a boiling water reactor to which the present invention is applied;
FIG. 6 is a cross-sectional view of the recirculation pump of FIG. 5.

In FIG. 5, 1 is a reactor pressure vessel, and a shroud 3 surrounding a reactor core 2 is provided within the reactor pressure vessel 1. Control rods 4 are attached to the reactor core 2, and the activities of the reactor core 2 are regulated. The steam generated in the reactor core 2 is dehydrated by a steam separator 5.

It is dried in a steam dryer 6 and sent from the main steam lower through the main steam pipe to the turbine.

A plurality of recirculation pumps 8 are provided at the four bottoms of the reactor pressure vessel 1. Recirculation pump 8 recirculates reactor water within reactor pressure vessel 1 .

Next, the configuration of the recirculation pump 8 will be explained with reference to FIG.

The pump body 9 is provided in an annular flow path between the reactor pressure vessel 1 and the shroud 3, and functions to send reactor water from the top to the bottom in the figure. 14 is a motor case, which is welded to the bottom of the reactor pressure vessel 1. Motor case 14
A wet type motor 15 is built inside. 15
1 is a stator, and 152 is a rotor. The wet type motor 15 and the impeller 11 of the pump body 9 are connected to the pump shaft 16.
are connected via. The pump shaft 16 is supported in radial bearings 17,18 and thrust bearings 19.20. The auxiliary impeller 21 circulates the reactor water in the motor case 14 through the heat exchanger 22 as shown by the arrow in the figure.
The inside of the motor case 14 is maintained at a constant temperature. 23 is a lid of the motor case 14. A cylindrical stretch tube 24 is inserted into the nozzle section 141 of the motor case 14 and fixes the upper differential user 13 to the nozzle section 141. The upper differential user 13 is fixed by pulling it downward with a stretch tube nut 25 installed at the lower end of the stretch tube 24.
1 is firmly attached. 26 is a purge water inlet, and purge water is sent from the purge water inlet 26 into the gap 27 between the stretch tube 24 and the pump shaft 16 through an opening 241 attached to the stretch tube 24.

In addition, by injecting purge water, the cooling water in the reactor pressure vessel 1 and the reactor water in the motor case 14 are connected to the slit 27.
Block distribution through .

According to this embodiment, it is possible to provide a tail-length butt type radial bearing with a high bearing load capacity.

The tapered hole 301 of the back metal 31 may be a two-stage hole with different hole diameters, or a straight hole with a groove in the middle, as shown in FIG.

〔Effect of the invention〕

According to the present invention, it is possible to improve the adhesion between the back metal and the auxiliary material of the tail extended pad type radial bearing, and it also improves the flow of lubricant into the pads, promoting the shape of the lubricant film. The load carrying capacity of the bearing is improved.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of an embodiment of the tail extension pad type radial bearing of the present invention, Fig. 2 is a sectional view of the swelling material shown in Fig. 1, and Fig. 3 is a sectional view of the swelling material shown in Fig. 2. 5 is a sectional view of a boiling water reactor to which the present invention is applied; and FIG. 6 is a sectional view of another embodiment of the hole in the back metal. FIG. 3 is a cross-sectional view of the pump. 16...Pump shaft, 29...Pad, 3o...Drying aid material, 31...Back metal, 32.33...Pad support, 34...Pivot. Kukai YZ diagram

Claims (1)

[Scope of Claims] 1. In a tailing pad type radial bearing including a backing metal and a moving material, the backing metal is provided with a plurality of tapered holes tapering toward the rotating shaft, and a part of the moving material 1. A tail-tension pad type radial bearing, characterized in that the tapered hole is filled with the material, and the material is integrated with the moving material.