JPH1037892A - Bearing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prolong the service life of bearing in a way of supplying a bearing with lubricating water in time of pump starting by installing a pan, connected to a shaft, storing this bearing lubricating water, in an upper part of the bearing, in a seawater pump with a stuffing box. SOLUTION: A pan 13 connected to a shaft 1, for storing seawater, is set up in the upper position of an intermediate shaft bearing 3 where lubricating water is not supplied. In time of pump stoppage, seawater 20 is stored in this pan 13. In time of pump starting, the shaft 1 gets rotating, and the seawater 20 stored in the pan 13 connected to the shaft 1 is dispersed outside by means of centrifugal force, flowing into the intermediate shaft bearing 3. The streamed seawater 20 flows into the intermediate shaft bearing 3 by a guide without leaking to the outside. Since the guide is provided with a bearing supplying hole 21 inside, the seawater 20 can be supplied for a proper time. Thus, since bearing application condition is wet enough, bearing service life can be prolonged.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seawater pump bearing used for condensate cooling and auxiliary equipment cooling in a nuclear power plant.

[0002]

2. Description of the Related Art As shown in FIG. 4, a conventional lubrication method for a submersible bearing in a seawater pump is such that a stuffing box 2, an intermediate bearing 3, and a lower bearing 4 are connected by an upper protective tube 11 and a lower protective tube 15. , The discharge port 10 in the upper protective tube 11
FIG. As shown in (1), there is a non-water injection type that employs an intermediate bearing that can be started in a dry state and uses pumped water as it is as lubrication water. Incidentally, as a related known example,
It is described in JP-A-16293.

[0003]

The water injection type seawater pump has the problems that the installation cost of the external lubricating water piping is required, and that maintenance and inspection work are required. I am doing it. However, in the non-water injection type, since the bearing does not have lubricating water at the time of starting, the bearing life is reduced.

An object of the present invention is to provide a non-injected seawater pump to which lubricating water is supplied when the pump is started.

[0005]

In order to solve the above-mentioned problems, the present invention according to the first aspect of the present invention provides a seawater sump tray connected to a shaft at an upper position of an intermediate bearing to which lubricating water is not supplied. The lubricating water in the pan was allowed to flow to the bearings by the centrifugal force generated by the rotation of the shaft when the pump was started.

In order to solve the above-mentioned problem, the present invention according to claim 2 is directed to a centrifugal force generated by rotation of the shaft, in which lubricating water accumulated in a pan connected to the shaft above the intermediate bearing is generated. A guide mechanism is provided so that the lubricating water flows to the bearing accurately.

In order to solve the above-mentioned problem, the present invention according to claim 3 has a dual structure in which a tray connected to a shaft is provided above an intermediate bearing, and the centrifugal force generated by rotation of the shaft causes the tray to receive the tray. The internal lubricating water was allowed to pass through the double structure and flow to the bearing.

According to the first aspect of the present invention, water pumped by the impeller when the pump is stopped is stored in the tray connected to the shaft. When the pump is started, the seawater stored in the tray is scattered outward by centrifugal force and spills out to the bearings.

According to the second aspect of the present invention, the pump stopped state is the same as in the first aspect,
When the pump is started, the seawater stored in the receiving tray is scattered outward by centrifugal force and spilled out to the bearing by the guide.

According to the third aspect of the present invention, the pump stopped state is the same as in the first aspect,
When the pump is started, the seawater stored in the tray is scattered outward due to centrifugal force, but an appropriate amount of water spills out to the bearing for a long time by a rotating guide installed outside the tray.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of a non-injected seawater pump according to the present invention will be described in detail with reference to FIG. 1, FIG. 2, FIG. 3, and FIG.

FIG. 1 shows an embodiment of the present invention. When the pump is stopped, seawater 20 is stored in the tray 13. When the pump is started, the shaft 1 rotates, and the seawater 20 stored in the tray 13 connected to the shaft 1 scatters outward due to centrifugal force and flows out to the intermediate bearing 3.

FIG. 2 shows an embodiment of the present invention. To start the pump, the shaft 1 rotates.
The seawater 20 stored in the receiving tray 13 connected to the water is scattered outward by the centrifugal force and flows out to the intermediate bearing 3. The seawater 20 that has flowed out flows through the guide 14 to the intermediate bearing 3 without leaking.

FIG. 3 shows an embodiment according to the third aspect of the present invention. When the pump is started, the seawater 20 stored in the tray 13 connected to the shaft 1 is scattered by centrifugal force,
Seawater is guided to a rotating guide 14 attached to the outside of the tray 13. A guide supply hole 21 is provided inside the guide 14.
, So that the seawater 20 can be supplied for an appropriate time.

That is, each of them has a self-lubricating structure that does not particularly require a function of injecting the bearing lubrication water from the outside at the time of startup.

[0016]

According to the seawater pump of the present invention, an external lubricating water pipe is not required because of a receiving mechanism in which lubricating water is stored above each bearing and a guide mechanism for accurately flowing lubricating water. It is possible to provide a non-injected seawater pump that can provide improved construction cost and improved reliability in maintenance / inspection work and the like as compared with a seawater pump. Further, since the bearing is used under wet conditions, the life of the bearing can be extended.

[Brief description of the drawings]

FIG. 1 is a vertical sectional view of an upper part of a seawater pump showing one embodiment of the present invention.

FIG. 2 is a longitudinal sectional view of an upper portion of a seawater pump showing another embodiment of the present invention.

FIG. 3 is a vertical sectional view of an upper part of a seawater pump showing another embodiment of the present invention.

FIG. 4 is a longitudinal sectional view showing a conventional water injection type seawater pump.

FIG. 5 is a longitudinal sectional view showing a conventional non-injection type seawater pump.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Shaft, 2 ... Staffing box, 3 ... Intermediate part bearing, 9 ... Discharge casing, 10 ... Pump discharge port, 13 ... Receiving tray, 20 ... Seawater.

Claims (1)

[Claims] 1. A shaft is supported by an intermediate bearing and a lower bearing, seawater is pumped into a casing by rotation of the shaft and an impeller, and a member for sealing between the shaft and the casing is supported above the shaft. In a seawater pump having a stuffing box, a bearing for storing bearing lubrication water connected to the shaft is provided above the bearing.