JPH11224584A - Fixing structure of case and cover of circuit breaker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a structure to fix a case and a cover of a circuit breaker, in which peripheral walls of the case and the cover can be thinned. SOLUTION: A fitting plate 11 to be engaged with a peripheral wall 2A of a case 2 is provided at both ends of a peripheral wall 1A in a direction on which a section of each phase of a cover 1 is lined up, and a projecting part 9 and a fitting hole 10 which can be engaged with each other are formed on the peripheral wall 2A of the case 2 and in the fitting plate 11 of the cover 1. The peripheral walls of the case 2 and the cover 1 are mutually coupled, so that a peripheral wall of a circuit breaker can be thinned. Accordingly, the circuit breaker can be miniaturized. In addition, screw parts of the cover 1 and the case 2 are not likely to be damaged.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure for fixing a case and a cover of a circuit breaker, and more particularly to a structure capable of reducing the outer peripheral wall of the case and the cover.

[0002]

2. Description of the Related Art FIG. 6 is an exploded perspective view showing a structure for fixing a case and a cover of a conventional circuit breaker. Both the case 2 and the cover 1 are arranged such that one side is open and the opening sides face each other. In addition, the case 2 and the cover 1 are connected to a phase separation wall 2 in which the insides of the outer peripheral walls 1A and 2A are parallel to each other.
B. However, the phase spacing wall on the cover 1 side is not seen in FIG. 6, but is located at the same position as the phase spacing wall 2B and abuts against each other. In addition, the outer peripheral wall 1
A and 2A are also located at the same position and abut each other. In each section 12 divided by the phase interval wall 2B, a breaking mechanism (not shown) of a different phase is housed, respectively, to constitute a three-phase circuit breaker. Case 2
The cover 1 and the cover 1 are screwed at the position of the phase gap wall 2B. That is, the tapping screw 3 is passed through the hole 4 of the cover 1 and screwed into the screw hole 5 of the case 2.

FIG. 7 is a perspective view of a main part showing a configuration in which the case 2 and the cover 1 of FIG. 6 are fixed. The case 2 and the cover 1 are fixed by the tapping screw 3.
FIG. 8 is a partially crushed side view of FIG. 7, and the cross sections on both sides that are crushed are YY cross sections in FIG. 7. Case 2 and cover 1
Has generally been molded with a thermosetting resin, but recently has come to be molded with a recyclable thermoplastic resin due to environmental concerns. However, the thermoplastic resin has a problem that the flatness is relatively difficult to obtain, so that it is necessary to manufacture the thermoplastic resin so that no gap is formed on the mating surface 6A between the case 2 and the cover 1. A method of screwing the outer peripheral walls 1A and 2A to each other so that no gap is formed on the mating surface 6A can be considered, but this is impossible because there is no space. For that purpose, post-processing with high precision so that the mating surface 6A becomes flat,
Alternatively, it is molded in advance so that the mating surface is formed in an arc shape so as to have a slight gap like the one-dot chain line surface 6B in FIG. Since the thermoplastic resin has flexibility, the case 2 is finally tightened with the tapping screw 3.
There is no gap in the mating surface 6A between the cover 1 and the cover 1.

[0004]

However, the conventional circuit breaker as described above has a problem that the outer peripheral wall of the case and the cover cannot be made thin. FIG.
FIG. 9 is a partially broken side view showing a configuration at the moment when the circuit breaker in FIG. 8 is short-circuited and interrupted. When the circuit breaker detects a short circuit in the main circuit and breaks the short circuit, the pressure in the compartment 12 increases and tries to expand. Since the outer peripheral walls 1A and 2A are not fixed to each other, they become inclined as shown in FIG. 9, and cracks 7 and 8 may be generated at the roots, and the device may be broken. In order to withstand this short-circuit interruption, the outer peripheral walls 1A,
2A could not be too thin. Therefore, the circuit breaker could not be reduced in size.

An object of the present invention is to provide a structure for fixing a case and a cover of a circuit breaker in which the outer peripheral wall between the case and the cover can be made thin.

[0006]

According to the present invention, in order to achieve the above-mentioned object, both are opened so that one of them is open and the opening sides thereof are opposed to each other. The circuit breaker has a structure in which the case and the cover of the circuit breaker are partitioned and each of them has a breaking mechanism of a different phase housed therein. In a fixed structure of the case and the cover of the circuit breaker in which the cover and the case are screwed together at the position of the phase separation wall, the cover and the case are formed of a flexible material, At both ends, a mounting plate that fits with the outer peripheral wall of the case is provided on the outer peripheral wall, and a convex portion and a fitting hole that can be fitted to each other are formed on the outer peripheral wall of the case and the mounting plate of the cover. May that. As a result, since the outer peripheral walls of the case and the cover are connected to each other, even if the pressure in the compartment increases due to the short circuit interruption of the circuit breaker, the bulge of the compartment is reduced, so that a crack is generated at the root of the outer peripheral wall. Disappears. Thereby, the outer peripheral wall of the circuit breaker can be made thinner than before.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to embodiments. FIG. 1 is an exploded perspective view showing a structure for fixing a case 2 and a cover 1 of a circuit breaker according to an embodiment of the present invention. 2 is a perspective view of a main part showing a configuration in which the case 2 and the cover 1 of FIG. 1 are fixed, and FIG. 3 is a partially crushed side view of FIG. 2 X
It is a -X cross section. In this embodiment, a thermoplastic resin is used for the case 2 and the cover 1. 1 to 3 are different from the conventional circuit breakers shown in FIGS. 6 to 8 in that the outer peripheral wall 1A of the case 2 is fitted to both ends of the outer peripheral wall 1A in the direction in which the sections 12 of each phase of the cover 1 are arranged. A fitting plate 11 is provided so as to match, a convex portion 9 is provided on the outer peripheral wall 2A of the case 2, a fitting hole 10 is provided on the mounting plate 11, and the convex portion 9 is formed so as to fit into the fitting hole 10. Only where they are. Other parts are the same as those of the conventional circuit breaker, and the same parts are denoted by the same reference numerals and detailed description thereof will be omitted. As a result, the outer peripheral walls 1A and 2A of the case 2 and the cover 1 were connected without any gap and without screwing. Since the cover 1 is formed of a flexible material, the projection 9 fits into the fitting hole 10 after the mounting plate 11 is once inclined outward by the projection 9. After the outer peripheral walls 1A and 2A have been connected to each other, the cover 1 and the case 2 are tightened with tapping screws, so that it is not necessary to tighten the screws more strongly than necessary, and the screw portion is not damaged.

FIG. 4 is a partially broken side view showing the configuration at the moment when the circuit breaker of FIG. 3 is short-circuited and interrupted. Although the pressure in the section 12 rises and tries to expand, the outer peripheral walls 1A and 2A are connected to each other, so that the outer peripheral walls 1A and 2A need only be slightly inclined, and no cracks occur. Was. Therefore, the outer peripheral walls 1A and 2A of the circuit breaker can be made thinner than conventional ones, and the circuit breaker can be downsized.

FIG. 5 is a partially broken side view showing a structure for fixing a case and a cover of a circuit breaker according to another embodiment of the present invention. The only difference from FIG. 3 is that the fitting hole 10 is provided on the outer peripheral wall 2 </ b> A of the case 2, and the protrusion 9 is provided on the mounting plate 11. Since the outer peripheral walls 1A and 2A of the case 2 and the cover 1 are connected to each other, the performance in this case is exactly the same as in FIG. 3, and no crack is generated even when the circuit breaker is short-circuited. Therefore, the outer peripheral walls 1A and 2A of the circuit breaker can be made thinner than the conventional one.
The circuit breaker can be reduced in size.

In the embodiments shown in FIGS. 1 and 5, the three-phase circuit breakers are used. However, the present invention can be applied to a single-phase circuit breaker having two sections. Can be. The fitting hole 1 in the embodiment of FIGS.
Although 0 is a through hole, the fitting hole 10 does not necessarily have to penetrate. That is, the fitting hole may be a recessed hole that can be fitted to the projection.

[0011]

As described above, according to the present invention, at both ends in the direction in which the sections of each phase of the cover are arranged, mounting plates are provided on the outer peripheral wall so as to be fitted with the outer peripheral wall of the case. By forming a fitting portion and a fitting hole that can be fitted to each other on the mounting plate, the outer peripheral walls of the case and the cover are connected to each other, and the outer peripheral wall of the circuit breaker can be made thinner than before. Therefore, the circuit breaker can be reduced in size. Further, the screw portion between the cover and the case is not damaged.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing a fixing structure of a case and a cover of a circuit breaker according to an embodiment of the present invention.

FIG. 2 is a perspective view of a main part showing a configuration in which a case 2 and a cover 1 of FIG. 1 are fixed.

FIG. 3 is a side view of the partially crushed part of FIG. 2;

FIG. 4 is a partially broken side view showing the configuration at the moment when the circuit breaker of FIG. 3 is short-circuited and interrupted.

FIG. 5 is a partially broken side view showing a fixing structure of a case and a cover of a circuit breaker according to another embodiment of the present invention.

FIG. 6 is an exploded perspective view showing a structure for fixing a case and a cover of a conventional circuit breaker.

7 is a perspective view of a main part showing a configuration in which the case and the cover of FIG. 6 are fixed.

FIG. 8 is a partially broken side view of FIG. 7;

9 is a partially broken side view showing the configuration at the moment when the circuit breaker of FIG. 8 is short-circuited and interrupted.

[Explanation of symbols]

1: cover, 2: case, 1A, 2A: outer peripheral wall, 2B:
Phase spacing wall, 3: tapping screw, 9: convex, 10: fitting hole, 11: mounting plate, 12: partition

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Makoto Ogasawara 1-1, Tanabe-Nitta, Kawasaki-ku, Kawasaki-shi, Kanagawa Prefecture Inside Fuji Electric Co., Ltd. (72) Inventor Kiyoshi Hasegawa ▼ Yoshi ▼ Field No. 1 Fuji Electric Co., Ltd.

Claims (1)

[Claims] 1. A circuit breaker having one opening and one opening facing each other, wherein the inside of an outer peripheral wall is partitioned by parallel phase separation walls, and a breaking mechanism of a different phase is housed in each partition. The outer peripheral walls of the case and the cover and the inter-space walls are butted at the same position and are formed of a flexible material, and the cover and the case are fixed to each other. In the fixing structure of the case and the cover of the circuit breaker screwed at the position of the partition wall, mounting plates are provided at both ends of the outer circumferential wall in the direction in which the sections of each phase of the cover are arranged to be fitted with the outer circumferential wall of the case. A fixing structure for fixing a case and a cover of a circuit breaker, wherein a convex portion and a fitting hole that can be fitted to each other are formed on an outer peripheral wall of the case and a mounting plate of the cover.