JPH03108222A - Rotary bearing device - Google Patents

Abstract

PURPOSE:To improve the sealing force by arranging a ring-shaped shielding member made of a nonmagnetic substance for blocking the movement of a magnetic fluid at a proper interval from the outer periphery end section of a partition plate. CONSTITUTION:A partition plate 11 is moved to the left side by the pressure of insulating gas, a gap 9c sealed by a ring-shaped shielding member 20 made of a nonmagnetic substance at the upper end section between the plate 11 and a magnetic substance 9b on the atmosphere side, a magnetic fluid 12 is held in the gap 9c, the plate 11 has no direct contact with the magnetic substance 9b, airtightness is maintained, thus insulating gas can be sealed. The upper end section of the gap 9c is sealed by the ring-shaped shielding member 20 made of a nonmagnetic substance, the magnetic fluid 12 in the gap 9c can be prevented from being scattered to the outside by the rotation of the plate 11, and the magnetic flux of the gap 9c is prevented from being decreased to cause the sharp reduction of the sealing force.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Field of Industrial Application) The present invention relates to a rotary bearing device used in gas-insulated switchgear and the like.

(Prior Art) Generally, a gas insulated switchgear has a contact portion housed in a container filled with an insulating gas such as SF6 gas, and the contact portion is driven by an operating device provided outside the container. A rotary 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 is constructed as shown in FIG. That is, an opening 1a is formed 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 opening 1a via a packing 3. Further, a main shaft 6, which is rotatably supported by bearings 4 and 5 and transmits driving force, is inserted through the through hole 2a. Further, a Y-shaped gasket 7.8 for maintaining airtightness between the housing 2 and the main shaft 6 is attached to the through hole 2a.

By the way, circuit breakers, disconnectors, etc. that constitute a gas-insulated switchgear are generally operated very infrequently. For this reason, the lip portion 7a of the packing 7.8.

The lubricant 8a may be removed and the gasket 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 account. However, when the frictional force is reduced, excessive force is transmitted to various parts of the operating device, which may damage the component parts.

Therefore, a rotary bearing device using magnetic fluid as shown in FIG. 3 has been proposed. That is, on the side surface of the container 1 on the atmosphere side,
A magnet storage case 9 for holding permanent magnets is provided. This magnet storage case 9 is an annular magnetic body 9a with an L-shaped cross section.

9b are arranged symmetrically to each other, a permanent magnet 13 is fixed in a space 9d formed on the outer circumferential side of both, and a gap 9c is formed on the opposing surfaces on the inner circumferential side. ing. Moreover, on the atmosphere side side surface of the magnetic body 9b,
A housing 10 having an opening 10a is secured.

A main shaft 6 rotatably supported by bearings 4 and 5 is inserted through the opening 1-11a of the container 1 and the opening 10a of the housing, respectively. Further, a disk-shaped partition plate 11 is fixed to the main shaft 6 to be inserted into the gap 9C, and the gap is filled with a magnetic fluid 12 held by the magnetic force of the magnetic bodies 9a and 9b.
2 maintains airtightness. Note that the container 1 and the magnetic body 9a, and the magnetic body 9b and the housing 10 are airtightly fixed through a gasket 3, respectively. Furthermore, the opening 1a of the container 1 and the opening 10a of the housing 10 are arranged on the same axis.

(Problems to be Solved by the Invention) However, in a rotary bearing device using a magnetic fluid as shown in FIG. 3, there are problems to be solved as described below. That is, when the magnetic fluid 12 is scattered due to the rotation of the partition plate 11 fixed to the main shaft and adheres to the inside of the permanent magnet 13 as shown in FIG. The magnetic flux in the gap 9C, which was 100 degrees, decreased significantly, causing a significant decrease in sealing force.

The present invention was proposed in order to eliminate the following two drawbacks, and its purpose is to provide a rotary bearing device with improved sealing force.

[Structure of the Invention] (Means for Solving the Problems) The present invention provides a method in which, on the outside of a container in which an insulating gas is sealed,
A gap is formed on the inner periphery side, and a ring-shaped magnet storage case holding the magnet is fixed airtightly, and a part of the partition plate fixed to the main shaft is inserted into the gap, and a magnetic field is inserted into the gap between the two. A rotary bearing device filled with fluid, characterized in that a ring-shaped shielding member made of a non-magnetic material for preventing movement of the magnetic fluid is disposed at an appropriate distance from the outer peripheral end of the partition plate. That is.

(Function) According to the rotary bearing device of the present invention, a ring-shaped shield made of a non-magnetic material is disposed at an appropriate interval from the outer peripheral end of the partition plate to prevent movement of magnetic fluid. Therefore, the magnetic fluid filled in the gap can be prevented from scattering or flowing out to the outside.

(Example) Hereinafter, an example of the present invention will be specifically described based on FIG. Note that the same members as those of the conventional type shown in FIGS. 2 to 4 are designated by the same reference numerals, and the description thereof will be omitted.

In this embodiment, as shown in FIG. 1, a magnet storage case 9 for holding a permanent magnet is provided on the side surface of the container 1 facing the atmosphere. This magnet storage case 9 has annular magnetic bodies 9a and 9b each having an L-shaped cross section arranged symmetrically to each other, and a space 9 formed on the outer circumferential side of the two.
A permanent magnet 13 is fixed to d, and a gap 9c is formed between the opposing surfaces on the inner peripheral side. Further, a magnetic fluid 1 filled in the gap 9C is located inside the permanent magnet 13 and in contact with the − end of the gap 9c.
A ring-shaped shielding member 20 made of a non-magnetic material is provided to prevent the movement of the shield member 2 .

Furthermore, assuming that the dimensions of the permanent magnet 13 are Hl and the dimensions of the ring-shaped shielding member 20 made of non-magnetic material are H2, the sound of rain is as follows.
II2>)i. Further, a packing 3 such as an O-ring provided between the container 1 and the magnetic material 9a, and between the magnetic material 9b and the housing 10 is arranged so as to be located at the center of the ring-shaped shielding member 20 made of the non-magnetic material. The container 1, magnetic materials 9a, 9b, and housing 10 are arranged inside the container 1 and outside the housing 10 (
(7) It is configured to be tightened from both sides with bolts or the like to maintain internal airtightness.

The rotary bearing device of this embodiment, which incorporates such a configuration, operates as described below. That is, an insulating gas with a diffused pressure higher than atmospheric pressure is sealed in the container 1, and the pressure of this insulating gas is distributed between the insulating gas side on the right side of the figure and the left side of the figure. Acts on the side. As a result, the partition plate 11 moves to the left, but the space between the partition plate 11 and the atmosphere-side magnetic material 9b is sealed by a ring-shaped shielding member 20 made of a non-magnetic material at its two ends. Gap 9c
Further, a magnetic fluid 12 is provided within this gap 9c.
is held, the partition plate 11 and the popular side magnetic body 9b
Since there is no direct contact between the two and airtightness is maintained, it is possible to seal the insulating gas. Further, since the upper end of the gap 9c is sealed by a ring-shaped shielding member 20 made of a non-magnetic material, it is possible to prevent the magnetic fluid 12 in the gap 9c from scattering to the outside due to rotation of the partition plate 11, etc. Therefore, the magnetic flux in the gap 9c is reduced and the sealing force does not significantly decrease. Furthermore, when the main shaft 6 is rotated in this state, the partition plate 11 is exposed to the magnetic body 9a via the magnetic fluid 12.

Since it rotates between 9b, no frictional force is generated in this part,
Since the frictional force is generated only between the main shaft 6 and the bearings 4 and 5, the amount of frictional force generated in the entire device is small. Another advantage is that when the container 1, magnetic bodies 9a, 9b, and housing 10 are tightened and fixed from the outside with bolts or the like, it is possible to prevent damage to the magnets due to excessive tightening force applied to the permanent magnets. There is also.

As described above, according to the present embodiment, the ring-shaped magnetic fluid 12 filled in the gap 9c between the magnetic bodies 9a and 9b and the non-magnetic substance provided so as to seal the upper end of the gap 9c. The shielding part +4' 20 can keep the insulating gas inside the container airtight. In addition, since the magnetic fluid 12 filled in the gap 9c can be prevented from scattering or flowing out due to rotation of the partition plate 11, etc., the decrease in magnetic flux in the gap 9c due to short circuit of the magnetic path, which has been a problem in the past, can be prevented. It can be prevented.

Note that the present invention is not limited to the embodiments described above, but includes a ring-shaped shield made of a non-magnetic material disposed to prevent movement of the magnetic fluid 12 filled in the gap 9c. Part) As rA20, an elastic member such as rubber may be press-fitted, a plate-shaped non-magnetic material may be molded into a ring shape, or a filler made of a non-magnetic material may be placed in the space 9d. It may be filled with

Further, the ring-shaped shielding portion 4/I2 made of the non-magnetic material
As shown in FIG. 1, the number 0 may be provided at a portion in contact with the upper end of the gap 9c, or may be provided at an appropriate distance from the outer circumference of the partition plate. In this case, the lower surface of the ring-shaped shielding member 20 made of a non-magnetic material and the magnetic material 9a
, 9b is preferably filled with the magnetic fluid 12 that fills the gap 9c.

[Effects of the Invention] As described above, according to the present invention, the ring-shaped shielding member made of a non-magnetic material that prevents the movement of magnetic fluid is
By simply arranging the partition plate at an appropriate distance from the outer peripheral end thereof, it is possible to provide a rotary bearing device in which the sealing force is directed in the -L direction.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view showing an example of the rotary bearing device of the present invention, FIG. 2 is a cross-sectional view showing an example of a conventional rotary bearing device, and FIGS. 3 and 4 are other examples of the conventional rotary bearing device. It is a sectional view showing an example. 1... Container, 1a... Opening, 2... Housing,
2a... Opening, 3... Packing, 4, 5... Bearing, 6... Main shaft, 7, 8... Packing, 9...
・Magnet storage case, 9a, 9b...magnetic material, 9c...
・Gap, 10...Housing, 10a...Opening, 1
DESCRIPTION OF SYMBOLS 1... Partition plate, 12... Magnetic fluid, 13... Permanent magnet, 20... Ring-shaped shielding member made of a non-magnetic material.

Claims (1)

[Claims] A container in which an insulating gas is sealed and has an opening; an annular container that is airtightly fixed to the outside of the container, with a gap formed on the inner circumference side; and a ring-shaped container that holds a magnet. a magnet storage case, a housing that is airtightly fixed to the outside of the magnet storage case and has an opening, and a housing that is inserted through the opening of the container and the opening of the housing, and is rotatably supported via bearings, respectively. A rotary bearing device comprising a main shaft, a partition plate fixed to the main shaft and a part of which is inserted into a gap in the magnet storage case, and a magnetic fluid filled in the gap in the magnet storage case, A rotary bearing device characterized in that a ring-shaped shielding member made of a non-magnetic material for preventing movement of the magnetic fluid is disposed at an appropriate distance from an outer peripheral end of the partition plate.