JPH02309065A - Rotary bearing device for gas insulation opening/closing device - Google Patents

Abstract

PURPOSE:To reduce the friction force by sealing insulating gas with a disk- shaped partition plate fixed to a main spindle, a circular magnet having a gap inserted with this end section, and a magnetic fluid filled in the gap, and restricting the movement of the partition plate within the gap with a thrust bearing. CONSTITUTION:Insulating gas of several atm higher than the atmospheric pressure is generally sealed in a container 1. The pressure of this insulating gas is applied to a partition plate 11 from the right to the left, thereby the partition plate 11 is moved to the left, and an end section is brought into contact with a thrust bearing 13. The partition plate 11 and a permanent magnet 9 are not brought into direct contact with each other, a sufficient magnetic fluid 12 is held between them, thus the insulating gas can be sealed. When a main spindle 12 is rotated under this condition, a friction force is generated only between the main spindle 6 and bearings 4 and 5 and between the partition plate 11 and the thrust bearing 13, thus the value can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a rotating bearing device for a gas-insulated switchgear using a magnetic fluid.

(Prior Art) Generally, a gas insulated switchgear has a contact portion housed in a container filled with an insulating gas such as SF or gas, and the contact portion is driven by an operating device provided outside the container. A bearing device with an insulating gas sealing function is used in a portion that transmits the driving force into the container.

A conventional rotary bearing device has a configuration as shown in FIG.

That is, an opening 1a is provided in a part of the container 1 filled with insulating gas. A housing 2 having a through hole 2a in the center is airtightly attached to this frontage 1a via a packing 3. Further, a main shaft 6 that is rotatably supported by bearings 4 and 5 and transmits driving force is inserted through the through hole 2a. Furthermore, the housing 2 and the main shaft 6 are provided in the through hole 2a.
Y-shaped gaskets 7.8 are installed in two stages to maintain airtightness between the two.

By the way, circuit breakers, disconnectors, etc. that constitute a gas-insulated switchgear are generally operated very infrequently. For this reason, the lubricant on the lip of the seal 7.8 is removed, and the seal 7.8 may become stuck to the main shaft 6.

As a result, a phenomenon is observed in which the frictional force when rotating the main shaft 6 increases. Therefore, there was a need for an operating device that takes this frictional force into consideration. However, if the frictional force is small, excessive force will act on each part, damaging the components.

Therefore, a rotary bearing device using a magnetic fluid as shown in FIG. 3 has been proposed. In other words, there is a gap 9 on the side of the container 1.
An annular permanent magnet 9 having a shape is fixed, and this permanent magnet 9
Further, a housing 10 having an opening 10a is fixedly attached to the side surface of the housing 10. A main shaft 6 rotatably supported by bearings 4 and 5 is inserted through the opening 1a of the container and the opening 10a of the housing. Further, a disk-shaped partition plate 11 is fixed to the main shaft 6 to be inserted into the gap 9a.
A magnetic fluid 12 is filled in the gap 9a. The magnetic fluid 12 maintains airtightness.

However, even in this case, the partition plate 11 is pressed against the permanent magnet 9 due to fluctuations in insulating gas pressure.
This will inevitably lead to fluctuations in frictional force.

(Problems to be Solved by the Invention) As described above, in the conventional solid bearing device, it was not possible to keep the frictional force acting on the main shaft low during rotation.

The present invention has been made in consideration of the above points, and an object of the present invention is to provide a rotating bearing for a gas-insulated switchgear in which frictional force is reduced.

[Structure of the invention]

(Means for Solving the Problem) In order to achieve the above object, the present invention includes a disc-shaped partition plate fixed to the main shaft, and an annular magnet having a gap into which the end of the partition plate is inserted. The magnetic fluid filled in the gap seals the insulating gas, and the movement of the partition plate is restricted within the gap by a thrust bearing.

(Function) With this configuration, it is possible to provide a rotary bearing device for a gas-insulated switchgear that reliably seals the insulating gas and reduces frictional force.

(Example) An example of the present invention will be described below with reference to FIG. Note that parts equivalent to those shown in FIG. 2 or 3 will be described with the same reference numerals. That is, an opening 1a is provided in a container 1 filled with an insulating gas such as SF or gas.

An annular permanent magnet 9 is airtightly fixed to the outside of the container 1 via a packing 3. A gap 9a is formed in the inner circumference of this permanent magnet 9.

Furthermore, a housing 10 having an opening 10a is airtightly fixed to the outside of the permanent magnet 9 via a packing 3. Note that the opening 1a of the container and the opening 10a of the housing are arranged on the same axis.

Further, a main shaft 6 rotatably supported by bearings 4 and 5 is inserted coaxially through the opening 1a of the container and the opening 10a of the housing, respectively.

A disk-shaped partition plate 11 whose end portion is inserted into the gap 9a of the permanent magnet is fixed to the main shaft 6.

Further, one gap 9a is filled with a magnetic fluid 12 held by the magnetic force of the permanent magnet 9.

Further, a thrust bearing 13 is fixed to the permanent magnet 9 via a seat 14 so as to come into contact with the end of the partition plate 11. In other words, the thrust bearing 13 seen from the reference plane
The height h is made larger than the height H up to the gap 9a seen from the reference plane. That is, the thrust bearing 3 serves as a guide member that allows the partition plate 11 to pass through the gap 9a without touching the permanent magnet 9. Incidentally, the thrust bearing 13 can also be arranged with the partition plate 11 on the sandwiching surface side.
It can also be arranged on the inner periphery of the permanent magnet 9.

Next, the effects of the configuration of this embodiment will be explained. Generally, the container 1 is filled with an insulating gas at several atmospheres higher than atmospheric pressure. The pressure of this insulating gas acts on the partition plate 11 from right to left in the figure. As a result, the partition plate 11 moves leftward, and the end portion comes into contact with the thrust bearing 13. Therefore, the partition plate 11 and the permanent magnet 9 do not come into direct contact with each other, and a sufficient amount of the magnetic fluid 12 can be held between them, making it possible to seal the insulating gas.

Moreover, when the main shaft 6 is rotated in this state, the frictional force is generated only between the main shaft 6 and the bearings 4 and 5 and between the partition plate 11 and the thrust bearing 13, so its value becomes small.

Note that the seat 14 may be made of an elastic body to absorb movement of the partition plate 11.

〔Effect of the invention〕

As explained above, in the present invention, insulation is provided by a disk-shaped partition plate fixed to the main shaft, an annular magnet having a gap into which the end of the partition plate is inserted, and a magnetic fluid filled in the gap. Since the gas is sealed and the movement of the partition plate is restricted within the gap by a thrust bearing, it is possible to provide a rotary bearing device for a gas insulated switchgear that reliably seals the insulating gas and reduces frictional force. can.

[Brief explanation of the drawing]

FIG. 1 is a partial cross-sectional view of a rotary bearing device for a gas-insulated switchgear according to an embodiment of the present invention, FIG. 2 is a partial cross-sectional view of a rotary bearing device for a conventional gas-insulated switchgear, and FIG. 3 is a partial cross-sectional view of a rotary bearing device for a gas-insulated switchgear according to an embodiment of the present invention. FIG. 3 is a partial cross-sectional view of a rotary bearing device of a gas-insulated switchgear preceding FIG. 1... Container, 1a... Opening, 3...
Packing, 4.5...Bearing, 6...
Main shaft, 9... Permanent magnet, 9a... Gap, 10... Housing, 10a...
Opening, 11... Partition plate, 12... Magnetic fluid, 13... Thrust bearing, 14... Seat. Agent: Patent Attorney: Ken Chika, Yudo, Ken Daishimaru, Figure 1, Figure 2.

Claims (1)

[Claims] A container filled with an insulating gas and having an opening, an annular magnet hermetically fixed to the outside of the container and having a gap formed on the inner periphery, a housing hermetically fixed to the outside of the magnet and having an opening, and the container. a main shaft rotatably supported by a bearing and inserted into the opening of the housing and the opening of the housing, a disk-shaped partition plate fixed to the main shaft and having an end inserted into the gap of the magnet; A rotary bearing device for a gas insulated switchgear comprising a magnetic fluid filled in a gap and a thrust bearing that abuts an end of the partition plate and maintains the partition plate and the magnet in a non-contact manner.