JPS649801B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a draw-out type high-voltage electromagnetic contactor.

Generally, it is used to open and close circuits for controlling the operation of high-voltage motors and other various high-voltage circuits.
High-voltage electromagnetic contactors are known, and some of these high-voltage electromagnetic contactors include drawer-type ones. This pull-out type high-voltage magnetic contactor is normally installed in or close to a high-voltage circuit, and is configured so that it can be pulled out from the high-voltage circuit for easy maintenance and inspection. It is. Also,
This type of draw-out type high-voltage magnetic contactor is equipped with a vacuum switch for opening and closing the circuit and a power fuse for short-circuit protection, and a part of the vacuum switch, power fuse, wiring, etc. is mounted on an insulating frame or insulating board. It is designed to have resistance to high voltage by surrounding it with .

By the way, since the power fuse is for high voltage and large current, a relatively large one is used. For this reason, in conventional draw-out type high voltage electromagnetic contactors, the front end of the power fuse is fixed on a box-shaped insulating frame fixed to the front of the base as a structure to support the power fuse, and the main body of the electromagnetic contactor is Horizontal frames made of iron plates were provided on both sides, and the rear end of the power fuse was fixed to these horizontal frames via an insulating material. However, in such a support structure using horizontal frames, since the horizontal frames themselves are large, it is difficult to maintain a sufficient withstand voltage distance between these horizontal frames and high-voltage potential parts such as the power fuses and wiring. There were problems such as it being heavy and difficult to handle.

The present invention was made in view of the above circumstances, and
It is an object of the present invention to provide a draw-out type high-voltage electromagnetic contactor that can easily set a sufficient pressure-resistant distance near a high-voltage potential part, has a simple structure, and can reduce weight.

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 and FIG. 2 are diagrams showing one embodiment of the present invention. In these figures, reference numeral 1 indicates a base. This base 1 is formed into a substantially rectangular shape, and wheels 2, 2, . . . are provided at the four corners. An insulating frame 3 integrally formed of an insulating material is fixed to the front part of the upper surface of the base 1. This insulating frame 3 has partition walls 3a, 3a inside, and the inside is divided into a plurality of (three in this case) chambers. Furthermore, the insulating frame 3 has an opening facing rearward.

A cover 4 is fixed to the front side of the insulating frame 3. A drawer handle (not shown) or the like is attached to the cover 4 as necessary. Also,
Engagement protrusions 5, 5 are formed on both sides of the insulating frame 3, and support rods 6, 6 are fixed along the upper portions of these engagement protrusions 5, 5. in this case,
The support rods 6, 6 are formed with a U-shaped cross section, and have nuts 8, 8 for bolts 7, 7, which are buried in the insulating frame 3 with their threaded portions protruding. Fixed.

Further, the support rods 6, 6 are disposed in the front-rear direction and extend above the rear end of the base 1, and near the rear ends of these support rods 6, 6 are insulated. Each end of the support member 10 is fixed. In this case, the insulating support member 10 and the support rod 6 are the same as the insulating frame 3 and the support rod 6 described above.
It is fixed using bolts and nuts in the same way as in the case of .

Vacuum switches 11, 11, 11 are installed inside the insulating frame 3. One terminal 11a of the vacuum switch 11 is connected to the insulating frame 3.
It is fixed to a conductive member 12 fixed to the upper part of. Further, the other terminal 11b of the vacuum switch 11 is connected to a wiring 14 extending from a terminal 13 fixed to the rear side of the intermediate portion of the insulating frame 3. A front end portion of a support conductor 15 fixed to the lower part of the insulating support member 10 is connected to the terminal 13 . A connect finger 16 is provided at the rear end of the support conductor 15 .

Further, on the upper part of the insulating support member 10, a support conductor 1 is provided with a connect finger 17 at the rear end.
8 is fixed.

The conductive member 12 and the support conductor 18 are each provided with a fuse fixing member 20 made of a conductive material.
21 is fixed, and each end of a power fuse 22 is detachably fixed to these fuse fixing members 20 and 21.

Further, groove-shaped fitting portions 23, 23, . . . extending in the front-rear direction are formed on both sides of the upper surface of the insulating frame 3 and on the upper portions of the partition walls 3a, 3a. Similarly, the insulating support member 10 is also formed with a groove-shaped fitting portion. These fitting parts 23, 23...
Insulating plates 24, 24... are fitted and fixed.

In the above configuration, three sets of the vacuum switch 11 and the power fuse 23 are provided, and between each set of the vacuum switch 11 and the power fuse 22 is the partition wall 3a of the insulating frame 3 and the insulating plate 2.
It is isolated by 4.

Although not shown, a drive mechanism for opening and closing the vacuum switch 11 is provided at a lower portion inside the insulating frame 3.

The draw-out type high-voltage magnetic contactor configured as described above, like the conventional magnetic contactor of this type, connects the connect fingers 16 and 17 connected to each vacuum switch 11 and each power fuse 22 to a high-voltage circuit. It is used by being connected to a bus bar (not shown), and is pulled out to the front for maintenance and inspection.

According to the drawer-type high-voltage electromagnetic contactor as described above,
The structure is simple because the insulating support member 10 is fixed to the rear side of the insulating frame 3 by the support rods 6, 6, and the power fuse 22 is attached to the insulating frame 3 and the insulating support member 10. In addition, since the support rods 6, 6 are fixed to the insulating frame 3 along the engagement protrusions 5, 5 formed on both sides of the insulating frame 3, the fixation is achieved by the engagement protrusions 5, 5. The holding force is supplemented and sufficient fixing strength is obtained. Further, the support rods 6, 6 may be used as long as they can support the insulating support member 10 in the vertical direction and the front-back direction.

For these reasons, the support rods 6, 6 can be relatively thin, and by using such thin rods, the electromagnetic contactor main body can be made smaller and lighter. 6,6 and
It becomes possible to set a sufficient voltage-resistant distance between the power fuse 22, the support conductor 15, and other high-voltage potential parts.

In addition, in the above embodiment, the support rods 6, 6
Although we used a U-shaped cross section, we also used an L-shaped or I-shaped one.
A beam shape or the like can also be used.

As explained above, the drawer type high voltage electromagnetic contactor of the present invention includes a base, an insulating frame fixed to the front side of the top surface of the base, and a vacuum switch provided inside the insulating frame. , in a drawer-type high-voltage electromagnetic contactor comprising a power fuse electrically connected to the vacuum switch, engaging protrusions extending in the front-rear direction are formed on both sides of the insulating frame, respectively; The front part of the support rod is fixed to the insulating frame along each of these engagement protrusions, an insulating support member is constructed and fixed between the rear parts of these support rods, and the front end of the power fuse is fixed to the insulating frame. Since the support rod is fixed to the insulating frame and its rear end is fixed to the insulating support member, the holding force of the support rod is supplemented by the engagement protrusion, and sufficient fixing strength to the insulating frame is obtained; ,
The support rod may be relatively thin as long as it can support the insulating support member. Therefore, by using a thin rod, the electromagnetic contactor main body can be made smaller and lighter, and a sufficient pressure-resistant distance can be set between the support rod and a high-voltage potential part such as a power fuse. If it becomes possible, it will have a great effect.

[Brief explanation of the drawing]

FIG. 1 and FIG. 2 are both schematic configuration diagrams showing one embodiment of a draw-out type high-voltage magnetic contactor according to the present invention, with FIG. 1 being a side view and FIG. 2 being a side view and FIG.
It is a sectional view taken along a line. DESCRIPTION OF SYMBOLS 1... Base, 3... Insulating frame, 5... Engaging protrusion, 6... Support rod, 7... Bolt, 8... Nut, 10... Insulating support member, 11... Vacuum switch, 22 ...Power fuse, 24...Insulation board.

Claims (1)

[Claims] 1 comprising a base, an insulating frame fixed to the front side of the top surface of the base, a vacuum switch provided inside the insulating frame, and a power fuse electrically connected to the vacuum switch. In the drawer-type high-voltage electromagnetic contactor, engaging protrusions extending in the front-rear direction are formed on both sides of the insulating frame, and the front of the support rod is attached to the insulating frame along each of the engaging protrusions. an insulating support member is constructed and fixed between the rear portions of these support rods, a front end portion of the power fuse is fixed to the insulating frame, and a rear end portion of the power fuse is fixed to the insulating support member. High voltage electromagnetic contactor.