JPH0735020A - Tapered labyrinth type main shaft water sealing device - Google Patents

Abstract

PURPOSE:To provide a main shaft water sealing device capable of adjusting a labyrinth gap between the outer peripheral surface of a runner boss fitted to a main shaft and a labyrinth ring. CONSTITUTION:The outer peripheral surface of a runner boss 2a fitted to a main shaft 1 and an inner circumferential surface of the labyrinth ring 3 in contact with each other are provided with the same inclination in the opposite directions, and a fixing height of a labyrinth ring 3 to an upper cover is changed by a liner 8, so as to adjust a labyrinth gap 6. Consequently, the labyrinth gap 6 becomes adjustable. Moreover, when leaking water is increased, the labyrinth gap 6 can narrowed by making the liner 8 thinner.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spindle water sealing device for sealing a spindle of a water turbine.

[0002]

2. Description of the Related Art FIG. 2 is a block diagram of a conventional main shaft water seal device. In FIG. 2, a runner 2 is connected to a main shaft 1, and the runner 2 is covered with an upper cover 4. There is a runner gap 5 between the outer periphery of the runner 2 and the upper cover 4, and the river water flowing in the runner 2 infiltrates from the runner gap 5 to the back surface of the runner 2. In order to prevent water from leaking to the outside from the portion where the main shaft 1 penetrates the upper cover 4, the labyrinth ring 3 is attached to the upper cover 4 with the mounting bolts 7, and the labyrinth ring 3 and the runner boss 2a fitted to the main shaft 1 are attached.
It is in contact with the outer circumference of and sealed. As the main spindle water seal device, a carbon packing or a gland packing made of a soft fiber is sometimes used, but recently, a labyrinth type which is easy to maintain is adopted.

[0003]

In the conventional main spindle water seal device, the labyrinth gap 6 is fixed because the runner boss 2a fitted into the main spindle 1 and the contact portion of the labyrinth ring 3 in contact with the runner boss 2a are vertical. It was impossible to adjust the amount of water leakage.

An object of the present invention is to provide a main shaft water seal device capable of adjusting a labyrinth gap between an outer peripheral surface of a runner boss fitted on a main shaft and a labyrinth rinse.

[0005]

In a main shaft sealing device for sealing a main shaft of a water turbine with a labyrinth ring, the outer peripheral surface of a liner boss and the inner peripheral surface of the labyrinth ring fitted in the main shaft in contact with each other are in opposite directions. The above object is achieved by adjusting the labyrinth gap between the outer peripheral surface of the runner boss and the labyrinth ring by changing the mounting height of the labyrinth ring to the upper cover with a liner.

[0006]

According to the present invention, the outer peripheral surface of the runner boss and the inner peripheral surface of the labyrinth ring fitted to the main shafts in contact with each other have the same inclination in opposite directions, so that the mounting height of the labyrinth ring to the upper cover is increased. Can be adjusted to adjust the labyrinth gap.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a block diagram of a spindle water sealing device according to an embodiment of the present invention. 1, the same parts as those in FIG. 2 are designated by the same reference numerals. In FIG. 1, the outer peripheral surface of the runner boss 2a fitted to the main shaft 1 and the inner peripheral surface of the labyrinth ring 3 have the same inclination in opposite directions. When the labyrinth ring 3 is attached to the upper cover 4 with eight or ten mounting bolts, the mounting height of the labyrinth ring 3 is changed by changing the thickness of the liner 8. The thicker the liner 8 is, the larger the labyrinth gap 6 is. The thinner the liner 8 is, the narrower the labyrinth gap 6 is. Labyrinth ring 3 along with the operation of the turbine
When the labyrinth gap 6 is abraded and the amount of water leaking from the labyrinth gap 6 increases, the thickness of the liner 8 is reduced and the labyrinth gap 6 is narrowed.

[0008]

According to the present invention, the outer peripheral surface of the runner boss fitted on the main shaft and the inner peripheral surface of the labyrinth ring in contact with this surface are provided with the same inclination in opposite directions. The labyrinth gap can be adjusted by changing the mounting height. When the labyrinth ring wears, thinning the liner can narrow the labyrinth gap.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a spindle water sealing device according to an embodiment of the present invention.

FIG. 2 is a configuration diagram of a conventional spindle water sealing device.

[Explanation of symbols]

 1 Spindle 2 Runner 2a Runner Boss 3 Labyrinth Ring 4 Top Cover 5 Runner Gap 6 Labyrinth Gap 7 Mounting Bolt 8 Liner

Claims (1)

[Claims] 1. A main shaft sealing device for sealing a main shaft of a water turbine with a labyrinth ring, wherein the outer peripheral surface of a runner boss and the inner peripheral surface of the labyrinth ring fitted in the main shaft contacting each other have the same inclination in opposite directions. A taper labyrinth type main shaft water sealing device, characterized in that the mounting height of the labyrinth ring on the upper cover is changed by a liner to adjust a labyrinth gap between the outer peripheral surface of the runner boss and the labyrinth ring. .