JPS5846835B2 - Surjihogotanshidai - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a multi-terminal terminal block used in a power distribution board, and more particularly to a surge protection terminal block that protects each conductor from surges generated by device components in the power distribution board.

Conventionally, a connecting terminal block used in a control device such as a power distribution board has a plurality of strip-shaped terminal fittings 2 spaced apart from each other at predetermined intervals on the top surface of an insulated terminal block 1, as shown in FIG. They are installed in parallel.

3 is a washer for connecting the conductor to the terminal fitting 2, and 4 is a Q-bolt for tightening.

By the way, recent power distribution boards use many electronic components using semiconductors.

As is generally known, these electronic components are extremely susceptible to surges.

On the other hand, many devices that tend to generate surges, such as vacuum switches and thyristors, are being used in power distribution boards.

Therefore, there has been an increasing need to provide protection against surges in the low voltage circuits of power distribution boards.

However, in the conventional terminal block as shown in Figure 1, many conductors are gathered in one terminal block, and the surge generated in the - conductor is generated in each conductor due to induction, and the surge occurs in all the conductors. It was almost impossible to protect them.

In addition, although some lightning arresters are installed at appropriate locations in the low-voltage circuit, it is not possible to reliably and compactly protect all conductors from surges.

The present invention has been made in order to eliminate such conventional drawbacks, and an object of the present invention is to provide a surge protection terminal block that can reliably and compactly protect all conductive wires connected to the terminal block from surges.

In order to achieve this objective, the present invention provides a rectangular parallelepiped-shaped insulated terminal block with a terminal fitting insertion hole opening on one side thereof, and a strip-shaped terminal fitting having an input and an output connection section at both ends in the terminal fitting insertion hole. A through hole is formed in the center of the insulated terminal block in a direction perpendicular to the longitudinal direction of the terminal metal fitting, and the through hole is connected to the through hole between the through hole and the terminal metal fitting. A space is formed that opens on the same side as the terminal fitting insertion hole, and a plurality of insulated terminal blocks are arranged in parallel so as to close the opening of this space, and a fastener is grounded to each through hole. A lightning arrester consisting of a spring and a non-linear resistor is installed in the space so that the non-linear resistor abuts the tightening bolt and the non-linear resistor A surge protection terminal block is constructed by storing the terminal fitting with a spring interposed between the terminal fitting and the terminal fitting.

Hereinafter, one embodiment of the present invention will be described in detail using FIG. 2 a=i, FIGS. 3 g and b, and FIG. 4.

As shown in FIG. 2 ayb and FIGS. 3 g and b, a rectangular parallelepiped-shaped insulating terminal block 5 made of a resilient molded electrical insulator such as butyl rubber has an opening on one side. A terminal fitting insertion hole 6 is provided.

A strip-shaped terminal fitting 7 having input and output connecting portions 7a7b at both ends is inserted into the terminal fitting insertion hole 6, as shown in FIG. 2g.

In addition, in Fig. 2 g and Fig. 3 g, the insulated terminal block 5
Below the terminal fitting 7, there is an input and output connection section 7a.
, 7b is provided with a hole 8a.

8b is formed.

In addition, terminal fitting 70 input, output connection part 7 a t 7
As shown in FIG. 2g, bolts 11 for attaching conductive wires are inserted through the washer 9 and the spring washer 10, respectively.

This bolt 11 can be tightened and fixed by forming a pair with a nut 12 located in the hole 8a t8b.

Further, a through hole 13 is formed in the center of the insulated terminal block 5 in a direction perpendicular to the longitudinal direction of the terminal fitting 7.

Further, between the through hole 13 and the terminal fitting 7, the through hole 1
A space 14 is formed which is continuous with the terminal fitting insertion hole 3 and opens on the same side as the terminal fitting insertion hole 6.

In this space 14, as shown in the second diagram i, a non-linear resistor 15 made of a metallized central part of a disc made mainly of zinc oxide, and a spring 16 made of a material with excellent conductivity are installed. A lightning arrester consisting of the following is housed.

The non-linear resistor 15 is brought into contact with a tightening bolt (described later) passing through the through hole 13, and the spring 16 is interposed between the non-linear resistor 15 and the terminal fitting 7.

On the other hand, on one side of the insulated terminal block 5 where the terminal fitting insertion hole 6 opens, protrusions 17 are formed on the left and right sides of the through hole 13, respectively.

Furthermore, recesses 18 are formed at positions symmetrical to the protrusions 17 on the surfaces opposite to the side surfaces on which the protrusions 17 are formed.

FIG. 4 shows the surge protection terminal block of the present invention, in which a plurality of insulated terminal blocks 5 close the opening surface of the space 14, and the protrusions 17 of the adjacent insulated terminal blocks 5 and recess 18
They are fitted together and placed side by side.

The insulated terminal block 5 disposed at the end (on the left side in FIG. 4) is made of the same material as the insulated terminal block 5, as shown in FIG. A cover plate 21 is provided with a hole 19 having a diameter in the center thereof and a recess 20 into which the protrusion 17 of the insulated terminal block 5 fits.

Further, a metal holding plate 22 as shown in FIGS. 2e and 2f is provided so as to sandwich the insulated terminal block 5 and the cover plate 21.

A hole 23 having the same diameter as the through hole 13 is formed in the center of the holding plate 22, and one side (upper side in FIG. 2 e)
A bent part 22a is formed in the middle part of.

This bent portion 22a engages with the stepped portion 5a and the stepped portion 21a of the insulated terminal block 5 and the cover plate 21.

Furthermore, the holding plate 22, the cover plate 21 and the insulated terminal block 5L
They are integrally connected by a tightening bolt 24 that passes through the holes 19 and 23 and each through hole 13 and is grounded.

This tightening bolt 24 is connected to each non-linear resistor 1 as described above.
It is in contact with 5.

Each non-linear resistor 15 is grounded via the tightening bolt 24 and the steel frame of the switchboard.

In FIG. 4, reference numeral 25 denotes conductive wires attached to the input and output connecting portions 7a and 7b of the terminal fitting 7.

In the surge protection terminal block having such a configuration, when a surge generated in a device such as a thyristor flows to one conductor 25 and is guided to the other conductor 25, the surge passes through the terminal fitting T and is transmitted through the spring 16 in a non-linear manner. It flows to the resistor 15, flows through the tightening bolt 24, the holding plate 22, the steel frame of the switchboard in that order, and escapes to the ground.

Normally used voltage is also applied to the non-linear resistor 15, but due to the characteristics of the non-linear resistor 15, it does not escape to the ground.

In the above embodiment, the dimensions of the terminal fitting insertion hole 60 are preferably smaller than the thickness of the terminal fitting 7, and the diameter of the through hole 13 is formed slightly smaller than the outer diameter of the tightening bolt 24 to form an insulated terminal block. To keep a space part 14 as airtight as possible from the outside when 5 are arranged in parallel.

Furthermore, the insulating terminal block 5 does not necessarily have to be made of butyl rubber, and may be made of an insulator made of a general thermosetting resin.

As described above, according to the surge protection terminal block of the present invention, all conductive wires connected to the terminal block can be reliably and compactly protected from surges.

Further, since each non-linear resistor is brought into contact with a tightening bolt for integrally connecting each insulated terminal block, the grounding structure is simple.

Furthermore, since the terminal fitting is pressed by the spring, the fixing of the terminal fitting can be easily stabilized.

Furthermore, since terminal fittings, non-linear resistors, etc. can be assembled through the opening on one side of the insulated terminal block, assembly work is easy.

Since the insulating terminal blocks are arranged in parallel so as to close the opening of the space, the lightning arrester can be kept airtight, and there is no risk of moisture absorption and deterioration can be prevented.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing a conventional terminal block, FIGS. 2 a to i are explanatory diagrams showing main parts in an embodiment of the present invention, and FIGS. 3 a and b are insulated terminals in an embodiment of the present invention. A front view and a vertical cross-sectional side view of the stand, and FIG. 4 are plan views showing one embodiment of the present invention. 5... Insulated terminal block, 6... Terminal fitting insertion hole, 7a, 7b... Input, output connection part, 7
...Terminal fitting, 13...-Through hole, 14.
...Space part, 15...Nonlinear resistor, 1
6... Spring, 24... Tightening bolt.

Claims (1)

[Claims] 1 A rectangular parallelepiped-shaped insulated terminal block is provided with a terminal fitting insertion hole that opens on one side, and inputs are inserted into the terminal fitting insertion hole at both ends.
A strip-shaped terminal fitting having an output connection part is inserted, a through hole is formed in the center of the insulated terminal block in a direction perpendicular to the longitudinal direction of the terminal fitting, and a transparent hole is formed between this through hole and the terminal fitting. A space is formed that is continuous with the hole and opens on the same side as the terminal fitting insertion hole, and a plurality of insulated terminal blocks are arranged in parallel so as to close the opening of this space, and each transparent Each insulated terminal block is integrally connected by passing a grounded tightening bolt through the hole, and a lightning arrester consisting of a spring and a non-linear resistor is installed in the space, with the non-linear resistor touching the tightening bolt. A surge protection terminal block, characterized in that the non-linear resistor and the terminal fitting are housed so that a spring is interposed between the terminal fitting and the non-linear resistor.