JPH09213158A - Switching device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the manufacturing cost of a metal case used for a disconnecting portion. SOLUTION: In a member on which a packing 18 provided on an auxiliary outer cylinder 17 constituting a moving disconnecting portion 27 slides, a metal case 24 covering the outer surface of the epoxy resin 15 of a fixed disconnecting portion 26 is formed by drawing a thin metal plate. On both ends thereof a large diameter portions 24a, 24b on which the packing 18 slides are formed, and in the intermediate portion thereof a small diameter portion 24c which no packing 18 touches is formed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a switchgear, and has an improved structure of a disconnecting section.

[0002]

2. Description of the Related Art The structure of a conventional switchgear is shown in FIG. As shown in the figure, a fixed portion is formed by the base 1, the support frame 2 and the roof 3, and a drawer type switch 4 which can be pulled out and carried in is housed in the fixed portion. The power cable 6 is guided to the upper portion of the support frame 2 of the fixed portion via the cable connecting portion 7, while the power source bus bar 8 is guided to the lower portion. At the top and bottom of the support frame 2, there are disconnecting parts 5 in which the breaker 9 of the pullout switch 4 is automatically connected to or disconnected from the power cable 6 and the power bus 8 when the pullout switch 4 is loaded or unloaded. It is provided.

Next, the structure of the disconnecting section 5 will be described with reference to FIG. In the figure, 11 is an outer conductor connected to the breaking portion 9,
Reference numeral 12 is a conductor connected to the power cable 6 or the power supply busbar 8, 13 is a ring contact, 14 and 15 are epoxy resins, 16 is a main outer cylinder, 17 is an auxiliary outer cylinder, and 18 is a packing.

A metal case 19 for sliding the packing 18 when the disconnecting section 5 is disconnected or connected is provided so as to cover the cylindrical epoxy resin 15. In order to reduce the load caused by the packing 18 sliding when the pull-out switch 4 is pulled out and carried in, the metal case 19 has an outer diameter dimension at the middle portion in the longitudinal direction that is smaller than the packing 18.
The packing 18
Try not to touch. The metal case 19 is attached to the epoxy resin 15 via a holding metal fitting 20 and a bolt 21 shown in FIG. Here, 22 and 23 are O-rings. The metal case 19 is manufactured by cutting a thick pipe material by machining.

[0005]

However, since the machining of the metal case involves a large amount of cutting allowance, not only the cost required for the machining is high, but also a metal fitting is required for mounting the metal case.

On the other hand, when a metal case is formed by drawing, a material having a large wall thickness must be used, which causes cracks and cracks.

Therefore, an object of the present invention is to provide an opening / closing device that solves the above problems.

[0008]

The structure of the present invention for achieving the above object has a substantially cylindrical shape with a substantially uniform wall thickness so that a metal case on which a packing slides can be formed by drawing. The outer diameter of the intermediate portion in the length direction is set to be smaller than the outer diameter of both ends of the packing that slide.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail based on an embodiment shown in the drawings. Since this embodiment is an improvement of a part of the conventional opening / closing device, the same parts as those of the conventional device are designated by the same reference numerals, and the description thereof will be omitted. Only different parts will be described.

The structure of the switchgear according to the present invention is shown in FIG. As shown in the figure, the bolt 25 is attached to the outer peripheral surface of the epoxy resin 15.
A metal case 24 is attached via. The metal case 24 is formed in a substantially cylindrical shape having a substantially uniform plate thickness. That is, it is formed as shown in FIG. Large-diameter portions 24a and 24b having a large outer diameter are formed at the base end portion and the distal end portion of the metal case 24 so that the packing 18 contacts the disconnection portion when the disconnection portion is connected.
A small-diameter portion 24c having a small outer diameter is formed in the middle portion of 4 in order to prevent the packing 18 from sliding and to reduce the load when the pull-out type switch 4 is pulled out and carried in. The packing 18 is tapered between the large diameter portions 24a and 24b and the small diameter portion 24c so that the packing 18 starts sliding smoothly.
4d is formed. Mounting portions 24d for mounting the metal case 24 are formed on the outer peripheral portion of the end surface of the large diameter portion 24a, and mounting holes 24e are formed at equal intervals in the mounting portion 24d. Further, the mounting legs 24f are intermittently provided in the circumferential direction by bending the mounting portion 24d from the mounting portion 24d into the metal case 24 so that the mounting portion 24d does not directly contact the end surface of the epoxy resin 15.

The metal case 24 is 1.0 to 2.0.
A thin plate material of mm is drawn by a drawing method using a die, and the mounting leg 24f is formed by punching and bending.

To attach the metal case 24 to the epoxy resin 15, the metal case 2 is attached via the O-rings 22 and 23.
4 is fitted in the epoxy resin 15, and the mounting bolt 25 is inserted into the mounting hole 24e and screwed into the epoxy resin 15. Since the mounting leg 24f contacts the end surface of the epoxy resin 15, the metal case 24 is positioned relative to the epoxy resin 15. Then, the metal case can be attached without using a conventional mounting bracket.

Next, the operation of such an opening / closing device will be described.
When the drawer type switch 4 is carried in, the packing 18 is expanded by the large diameter portion 24a of the metal case 24 and slides as shown in FIG. 1, and when the packing 18 is located at the small diameter portion 24c, it slides. Without doing so, the load is reduced, and the disconnection section 5
When the connection is completed, the packing 18 slidably contacts the large-diameter portion 24b as shown by the phantom line in FIG. 1, and the O-rings 22 and 23 and the packing 18 form a space between the fixed disconnection portion 26 and the movable disconnection portion 27. Prevents dust and rainwater from entering and prevents deterioration of insulation characteristics.

[0014]

As can be seen from the above description, according to the opening / closing device of the present invention, it is possible to draw a thin plate material to manufacture a metal case. It does not crack or crack. Further, the processing time is shorter than that of cutting a thick material, and the cost of the metal case and the opening / closing device can be reduced. Further, by using the mold, the quality of the metal case by the processor can be made uniform with little variation. Further, since it is not necessary to use a pressing metal fitting as in the conventional case, the number of steps for assembling the opening / closing device is shortened, and the manufacturing cost of the opening / closing device is reduced.

[Brief description of drawings]

FIG. 1 is a sectional view of a disconnecting portion showing an embodiment of a switchgear according to the present invention.

FIG. 2 is a front view and a right side view of a metal case in an embodiment of a switchgear according to the present invention.

FIG. 3 is a configuration diagram of a conventional opening / closing device.

FIG. 4 is a cross-sectional view of a disconnecting portion in a conventional opening / closing device.

FIG. 5 is a perspective view of a holding metal member forming a disconnecting portion in a conventional opening / closing device.

[Explanation of symbols]

 5 ... Disconnection part 11 ... External conductor 12 ... Conductor 13 ... Ring contact 14, 15 ... Epoxy resin 16 ... Main outer cylinder 17 ... Auxiliary outer cylinder 18 ... Packing 22, 23 ... O-ring 24 ... Metal case 24a, 24b ... Large diameter Part 24c ... Small diameter part 26 ... Fixed disconnection part 27 ... Movable disconnection part

Claims (1)

[Claims] 1. A conductor having a ring contact fitted therein is provided inside the base end portion of the insulating cylinder to form a fixed disconnection portion, while surrounding an external conductor inserted into and removed from the ring contact and inserted into and removed from the insulating cylinder. An insulating column is provided, an outer cylinder is provided to cover the insulating cylinder when the outer conductor is inserted into the ring contact, and a packing is provided on the inner peripheral surface of the tip of the outer cylinder to form a movable disconnection section.
In an opening / closing device in which a disconnecting portion is formed by providing a substantially cylindrical metal case on which a packing slides on the outer peripheral surface of an insulating cylinder, the metal case has a substantially uniform thickness and is formed into a substantially cylindrical shape by drawing. A switchgear which is formed and is set to have an outer diameter dimension of a middle portion in a length direction smaller than outer diameter dimensions of both ends of the packing which slide.