JP2000268686A - Switchgear - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a switchgear enabling the time of sealing work to be shortened and enabling its manufacturing cost to be reduced if a main-circuit switching part and a ground switching part are disposed within a vacuum container. SOLUTION: In this switchgear, flanges 2a, 2a made by erecting peripheral parts of a tube member 2 substantially at a right angle to a circumferential surface of the tube member 2 are formed by press molding on opposite ends, respectively, of the tube member 2, an inner edge of one plate member 3 mounted with various components or an inner edge of the other plate member 3 is caused to abut on one flange 2a, and they are sealed up by brazing. An inner edge of the other plate member 3 mounted with various components or an inner edge of the one plate member 3 is caused to abut on the other flange 2a, and they are brazed to each other while internal air is exhausted by heating them to an appropriate temperature.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a switchgear having a main circuit opening / closing section for connecting / disconnecting a bus-side conductor and a load-side conductor, and a grounding opening / closing section for connecting / disconnecting a load-side conductor and a grounding conductor. .

[0002]

2. Description of the Related Art FIG. 5 is an explanatory view for explaining a conventional switchgear using a vacuum switch. In FIG. 5, reference numeral 31 denotes a bus, and reference numeral 40 denotes a vacuum holding the inside at a high vacuum. Switch. FIG. 6 is a side sectional view showing the vacuum switch 40 shown in FIG.

As shown in FIG. 6, a vacuum switch 40 is formed by sealing both ends of an insulating cylinder 41 made of ceramics with sealing plate members 42, 42 having a hole formed in the center. Member 42
A conductive movable electrode rod 44 is inserted into the hole of the sealing plate member 42 so as to be able to move forward and backward, and a conductive fixed electrode rod 43 is inserted into the hole of the other sealing plate member 42.
Is tightly fitted while maintaining the airtight state. One end of a cylindrical bellows 48 is sealed inside the insulating cylinder 41 around the hole of the sealing plate member 42 into which the movable electrode rod 44 is inserted.
The airtightness of the vacuum switch 40 is maintained by sealing the other end of the bellows 48 to the peripheral surface of the movable electrode rod 44 penetrating the 48.

A movable electrode 46 is provided at the tip of a movable electrode rod 44 inserted into the insulating cylinder 41, and a fixed electrode 45 disposed opposite to the movable electrode 46 is supported by the fixed electrode rod 43. Then, the movable electrode rod 44 is driven forward and backward by a driving device (both not shown) which is connected via an insulator.

[0005] Such three vacuum switches 40, 40, 40
Are provided corresponding to the three buses 31, 31, 31, and each bus
The 31, 31, 31 are connected to the movable electrode rods of the corresponding vacuum switches 40, 40, 40 via disconnectors 32, 32, 32, respectively. Power transmission cables (not shown) are connected to the fixed electrode rods of the vacuum switches 40, 40, and 40, respectively. Each fixed electrode rod can be grounded via a grounding switch 33, 33, 33. It has become.

In such a conventional switchgear, the disconnectors 32, 32, 32, the vacuum switches 40, 40, 40 acting as circuit breakers, and the earthing switches 33, 33, 33 are not shown. The switchgear cannot be miniaturized because it is disposed inside the metal box with a required electrical insulation distance from each other.

For this reason, the applicant of the present invention has disclosed in Japanese Patent Application Laid-Open No. 9-264614 a switchgear in which a main circuit opening / closing section for disconnecting and disconnecting and a grounding opening / closing section are arranged inside a vacuum vessel. In such a switchgear,
A vacuum container having a larger capacity than that of the vacuum switch shown in FIG. 6 is required, and if such a vacuum container is formed of an insulating tube as described above, the sealing operation requires a long time, resulting in a high manufacturing cost. was there.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object thereof is to provide a flange at a joint portion of at least one container member to be joined and a joint portion of another container member to be joined. By providing a vacuum vessel brazed to the flange and the flange, even if the main circuit opening and closing section and the grounding opening and closing section are arranged inside the vacuum vessel, the sealing operation can be performed in a short time, and An object of the present invention is to provide a switchgear that can reduce costs.

[0009]

According to a first aspect of the present invention, there is provided a switchgear for connecting and disconnecting a main circuit between a bus-side conductor and a load-side conductor, and connecting the load-side conductor with a grounding conductor. The detachable grounding opening / closing part is housed inside a metal vacuum container, the vacuum container is formed by joining a plurality of container members to each other, and a flange is provided at a joint portion of at least one of the joined container members. The joint portion of the other container member to be joined and the flange are brazed.

According to a second aspect of the present invention, in the switch gear according to the first aspect, the vacuum vessel is configured such that both openings of a cylindrical first vessel member are closed by a flat second vessel member. Are characterized in that flanges are respectively provided on the peripheral edges of both openings so as to follow the openings.

A switchgear according to a third aspect of the present invention is the switchgear according to the second aspect, wherein a cylindrical window is projected from a peripheral surface of the first container member, and a flange is formed at an opening edge of the window. It is provided so as to follow the opening, and the flange is closed by a flat third container member.

A switchgear according to a fourth aspect of the present invention is the switchgear according to the first aspect, wherein the vacuum vessel comprises two cylindrical bottomed fourth vessel members with the opening peripheral portions of both fourth vessel members facing each other. A flange portion is provided on the peripheral edge of the opening of the fourth container member so as to follow the opening.

A switchgear according to a fifth aspect of the present invention is the switchgear according to the fourth aspect, wherein one of the fourth container members is provided with a cylindrical window projecting therefrom, and a flange is formed on the periphery of the opening of the window. And the flange is closed by a flat third container member.

A switchgear according to a sixth aspect is characterized in that, in any one of the first to fifth aspects, a container member having a flange portion is formed by molding a base material.

According to the switchgear of the present invention, as in the second invention, for example, a metal flat plate-shaped second container is mounted on a flange provided on both peripheral edges of a metal cylindrical first container member. A vacuum vessel is formed by abutting the joints of the members and brazing them. In this manner, by providing a flange at the joint portion of at least one of the container members to be joined, a joint portion having high flatness is formed, and brazing is enabled. Also, in the case of joining and sealing by brazing, compared with the case of sealing by welding or the like, the work of sealing the vacuum vessel can be performed in a short time, and the main circuit opening and closing section and the grounding opening and closing section are arranged inside. Even when assembling a switchgear provided with a vacuum container having a relatively large volume, manufacturing costs can be reduced.

In the switchgear according to the third and fifth aspects of the present invention, a so-called vacuum brazing for joining the final joint portion while discharging the inside air is provided on the window portion of the first container member. It can be applied between the third container member. In this case, since the brazing area is small, the time required for vacuum brazing is short. As a result, the cost required for vacuum brazing, which requires a high manufacturing cost per unit time, can be reduced. On the other hand, before vacuum brazing, it is possible to confirm the mounting state of each component provided inside the vacuum vessel from the window.

According to the switchgear of the fourth aspect, the area to be brazed can be reduced, and the manufacturing cost can be further reduced.

In the switchgear according to the sixth aspect, since the container member having the flange is formed by, for example, press-molding a metal base material, the manufacturing cost of the container member is low. Further, even for a container member having a relatively large volume, a flange with high surface accuracy can be easily formed, and the quality of the switchgear is high.

[0019]

Embodiments of the present invention will be specifically described below with reference to the drawings. Embodiment 1 FIG. 1 is a partially cutaway front view showing a configuration of a main part of a switchgear according to the present invention. In the drawing, reference numeral 1 denotes a metal vacuum vessel. The vacuum vessel 1 is formed by sealing both openings of a tubular member 2 having a rectangular shape in plan view with plate members 3 and 3 so as to be grounded.

On the center line in the longitudinal direction of one of the plate members 3, three openings are provided at an appropriate distance from each other. The load-side bushings 31, 31, 31 having a cup shape are sealed. Load-side terminals 21, 21, 21 for connecting a power transmission cable are sealed and fixed to the respective load-side bushings 31, 31, 31 so as to penetrate the respective load-side bushings 31, 31, 31. The distal ends of the load-side terminals 21, 21, 21 are bifurcated,
At one end, first fixed electrodes 11, 11, 11 constituting main circuit switching units 13, 13, 13 are provided, and at the other end, second fixed electrodes constituting ground switching units 17, 17, 17 are provided. Electrodes 15, 15, 15 are provided.

The other plate member 3 has the first
Holes penetrating the other plate member 3 are respectively provided to face the fixed electrodes 11, 11, 11 and the second fixed electrodes 15, 15, 15. In each of the holes facing the first fixed electrodes 11, 11, 11,
The operating rods 26, 26, 26 are inserted so as to be able to move forward and backward. One end of a cylindrical bellows 18, 18, 18 is sealed around the inner surface of the other plate member 3 and around each of the holes into which the operating rods 26, 26, 26 are inserted. The other end of 18 is sealed to the peripheral surface of the operating rods 26, 26, 26 through which they are passed.

At the tips of the operating rods 26, 26, 26, insulating rods 25, 25, 25 and main circuit movable electrode rods 24, 24, 24 are fixed in this order, and the main circuit movable electrode rods 24, 24, 24 are fixed. The first movable electrode 12, 12, 21 is provided at the tip of the first fixed electrode 11, 12,
It is provided so that it can contact 11 and 11. By the way, the other plate member 3 is provided with an opening at a distance from each hole through which the operating rods 26, 26, 26 penetrate, and the outer surface of the other plate member 3 is provided around each opening. Is sealed with a bus-shaped bushing 33 having an insulating property.
Each bus-side bushing 33, 33, 33 has a bus-side terminal 28, 28, 28 to be connected to the bus, and each bus-side bushing 33, 33, 33,
33 is sealed and fixed so that it passes through
Flexible conductors 27, 27 (27) extend between the main circuit movable electrode rods 24, 24, 24 and the corresponding main circuit movable electrode rods 24, 24, 24.

In addition, ground movable electrode rods 29, 29, 29 are inserted into the respective holes facing the second fixed electrodes 15, 15, 15 so as to be able to advance and retreat. One end of a cylindrical bellows 19, 19, 19 is sealed around the inner surface of the other plate member 3 and around each of the holes into which the ground movable electrode rods 29, 29, 29 are inserted.
The other ends of 19, 19, 19 are sealed to the peripheral surfaces of the ground movable electrode rods 29, 29, 29 penetrating them. The second movable electrodes 16, 16, 16 are provided at the tips of the ground movable electrode rods 29, 29, 29.
However, it is provided so as to be able to contact the second fixed electrodes 15, 15, 15 described above.

At both ends of the cylindrical member 2, flanges having the peripheral edge of the cylindrical member 2 erected substantially perpendicularly to the peripheral surface of the cylindrical member 2.
2a, 2a are formed by press forming, respectively, and the inner edge of one plate member 3 or the inner edge of the other plate member 3 to which each component is attached as described above is brought into contact with one flange 2a. Is sealed by brazing. At this time, the surface of the flange 2a facing the plate member 3 is
Because it is flat, sealing work can be performed in a short time,
Manufacturing costs can be reduced. In addition, sealing reliability is high.

Then, the inner edge of the other plate member 3 or the inner edge of the one plate member 3 to which the respective components are attached is brought into contact with the other flange 2a as described above, and these are heated to an appropriate temperature. The so-called vacuum brazing is performed by brazing them while discharging inside air. At this time, as before, since the flange 2a is flat, it can be sealed by brazing, and the vacuum sealing work with a high manufacturing cost per unit time can be performed in a short time, further reducing the manufacturing cost. can do.

In this embodiment, the cylindrical member 2
Although the other flange 2a of the bellows is used as a final sealing position, the present invention is not limited to this. For example, one end of one of the bellows is opened, and that portion is formed as the final sealing position. Is also good. Thereby, the vacuum sealing operation can be further shortened.

Further, since the cylindrical member 2 and the flanges 2a, 2a are formed from a metal material by press molding, a desired shape can be easily obtained, and the manufacturing cost and the material cost are low. Further, the flatness and surface accuracy of the flanges 2a, 2a are high.

Second Embodiment FIG. 2 is a schematic partial cutaway front view showing a second embodiment, in which the number of sealing portions is reduced. In the figure, parts corresponding to those in FIG. 1 are denoted by the same reference numerals, and description thereof is omitted. As shown in FIG. 2, a metal vacuum container 1 includes a pair of bat-shaped boxes 4, 4 formed by press molding.
With the openings of both boxes 4, 4 facing each other.
Flanges 4a, 4a are formed on the periphery of the opening 4 respectively. The two boxes 4, 4 are sealed by bringing their flanges 4a, 4a into contact with each other and brazing the flanges 4a, 4a.

In such a switchgear, since the area to be brazed is small, the time required for brazing can be shortened, and the manufacturing cost can be further reduced.

Third Embodiment FIG. 3 is a schematic partially cutaway front view showing a third embodiment, in which a vacuum brazing operation can be performed more easily. In the figure, parts corresponding to those in FIG. 2 are denoted by the same reference numerals, and description thereof is omitted. On the side surface of one box 4, a cylindrical window 5 communicating with the inside and outside of the box 4 is protruded, and a flange 5 a is formed on the periphery of the opening of the window 5 at the opening of the window 5. It is provided after copying. A blocking plate member 6 having an area larger than the opening area of the window 5 is brought into contact with the flange 5a, and both are vacuum brazed.

In such a switch gear, the area for vacuum brazing is small, the time required for vacuum brazing can be reduced, and the manufacturing cost can be further reduced. Before vacuum-brazing the closing plate member 6 to the flange 5a of the window portion 5, the main circuit opening / closing portion, the grounding opening / closing portion, the bellows, and the like provided inside the vacuum vessel 1 through the opening of the window portion 5. Can be inspected.

In this embodiment, the case where the window 5 is provided in one of the two boxes 4, 4 to be joined is shown. However, the present invention is not limited to this, and as shown in FIG. A window 5 having a flange 5a is provided on the peripheral surface of the cylindrical member 2 of the vacuum vessel 1 in which both openings of the cylindrical member 2 are closed by the plate members 3 and 3, and the flange 5a and the abutment therewith are provided. Needless to say, the closed blocking plate member 6 may be vacuum brazed.

[0033]

As described above in detail, in the switchgears according to the first and second aspects of the present invention, the joint portion of the vacuum container, which has a high flatness, is sealed by welding or the like in order to braze the joint. In comparison with the case of attaching, a vacuum vessel sealing operation can be performed in a short time, and when assembling a switchgear including a relatively large vacuum vessel in which a main circuit opening / closing section and a grounding opening / closing section are arranged. Even so, the manufacturing cost can be reduced.

In the switchgears according to the third and fifth aspects of the present invention, the cost required for vacuum brazing, which requires a high production cost per unit time, can be reduced. On the other hand, before vacuum brazing, it is possible to confirm the mounting state of each component provided inside the vacuum vessel from the window.

According to the switchgear of the fourth aspect, the area to be brazed can be reduced, and the manufacturing cost can be further reduced.

In the switchgear according to the sixth aspect of the present invention, since the container member having the flange is formed by, for example, press-forming a metal base material, the manufacturing cost of the container member is low. In addition, even if the container member has a relatively large volume, the present invention has excellent effects, such as a flange having high surface accuracy can be easily formed and the quality of the switchgear is high.

[Brief description of the drawings]

FIG. 1 is a partially cutaway front view showing a main configuration of a switchgear according to the present invention.

FIG. 2 is a schematic partial cutaway front view showing the second embodiment.

FIG. 3 is a schematic partially broken front view showing a third embodiment.

FIG. 4 is a schematic partially cutaway front view showing another embodiment.

FIG. 5 is an explanatory diagram illustrating a conventional switchgear using a vacuum switch.

FIG. 6 is a side sectional view showing the vacuum switch shown in FIG. 5;

[Explanation of symbols]

1 vacuum vessel, 2 cylinder members, 2a flanges, 3 plate members, 4 boxes, 4a flanges, 5 windows, 5a flanges, 6 closing plate members.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Seiichi Miyamoto 2-3-2 Marunouchi, Chiyoda-ku, Tokyo Mitsui Electric Co., Ltd. (72) Inventor Takayuki Itoya 2-3-2 Marunouchi, Chiyoda-ku, Tokyo Inside the Mitsubishi Electric Corporation (72) Inventor Tomotaka Yano 2-3-2 Marunouchi, Chiyoda-ku, Tokyo Inside the Mitsubishi Electric Corporation (72) Inventor Minoru 2-3-2 2-3 Marunouchi, Chiyoda-ku, Tokyo Electric Co., Ltd.

Claims (6)

[Claims] A main circuit switch for connecting and disconnecting between a bus-side conductor and a load-side conductor, and a grounding switch for connecting and disconnecting between a load-side conductor and a grounding conductor are inside a metal vacuum vessel. The vacuum container is formed by joining a plurality of container members to each other, and a flange is provided at a joint portion of at least one of the container members to be joined, and a joint portion of the other container member to be joined and the flange are provided. A switchgear characterized by being brazed with: 2. A vacuum container, wherein both openings of a cylindrical first container member are closed by a flat plate-shaped second container member, and flanges are formed on both peripheral edges of the first container member following the openings. The switchgear according to claim 1, wherein each of the switchgears is provided. 3. A cylindrical window portion is projected from a peripheral surface of the first container member, and a flange is provided along a periphery of an opening of the window portion so as to follow an opening of the window portion. 3. The switchgear according to claim 2, wherein the switchgear is closed by a third container member. 4. A vacuum container comprising two cylindrical bottomed fourth container members, the opening peripheral portions of both of which are opposed to each other, and the flanges are opened at the opening peripheral portions of both of the fourth container members. The switchgear according to claim 1, wherein the switchgear is provided in accordance with the following. 5. A cylindrical window portion protrudes from one of the fourth container members, and a flange is provided along an opening edge of the window portion so as to follow the opening of the window portion. 5. The switchgear according to claim 4, wherein said switchgear is closed by said third container member. 6. The switchgear according to claim 1, wherein the container member having a flange is formed by molding a base material.