JPH083950Y2 - Circuit and disconnector housing - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Field of Industrial Application) The present invention relates to a casing of a circuit breaker or a circuit breaker having a structure capable of withstanding a large internal pressure during a breaking or breaking operation.

(Prior art) Circuit boards and circuit breakers molded with synthetic resin require strength to withstand the pressure rise due to arcing at the time of breaking or breaking, while demand for smaller sizes requires thinner walls. Has been done. For this reason, as a structure of the housing that can withstand a large internal pressure, as shown in FIG. 6, a molding structure in which a bridge portion 1a is provided at a part of the opening side of the case 1 to reinforce the side wall, or as shown in FIG. A structure in which a screw hole 1b is provided on the side wall of the case 1 on the opening side and the cover 2 is fixed with a screw 3 to reinforce the side wall has been used.

(Problems to be Solved by the Invention) In the above-described conventional structure, in the case 1 having the bridge portion 1a formed by molding on the opening side, the bridge portion 1a
Has to be provided between the arc-extinguishing chamber and the terminal 4 in view of the arrangement of the internal equipment, which deteriorates the workability of assembling the terminal 4 and
There is also a problem that it is difficult to carry out because the shape is restricted and the parts cannot be inserted vertically in the assembly by the automatic machine. Further, there is a problem that a complicated forming die is required for the bridge portion 1a at the time of molding.

Next, in the case of the structure in which the cover 3 is supported by the screw 3, the thickness of the side wall of the case 1 needs to be at least twice the screw diameter, and such a thickness cannot often be adopted due to the demand for downsizing. There's a problem.

The present invention has been made in view of the above circumstances, and provides a housing for a circuit or circuit breaker that can be easily assembled without thickening the side wall of the circuit or circuit breaker housing. It is in.

[Structure of the Invention] (Means for Solving the Problem) In the case of the circuit breaker and the circuit breaker of the present invention, the side wall of the case and the interphase wall facing the case are formed by separate members at the mating surfaces of the case and the cover. It is characterized by being connected by a bridge member consisting of.

(Operation) According to the circuit and disconnector housing of the present invention, the side wall of the housing and its interphase wall can be connected and reinforced after assembling the housing components in the case, so that the assembly is easy. The bridging member prevents the case from expanding due to a short-circuit current or a large internal pressure at the time of disconnection, thereby preventing damage to the case and the cover.

(Embodiment) An embodiment of the circuit and breaker casing of the present invention will be described with reference to FIGS. In FIG. 1, a case 5 molded with a synthetic resin accommodates a three-pole circuit breaker, a breaker breaker, and a breaking mechanism, and a space between the poles is partitioned between a pair of side walls 5b. It is in the form of a box with a one-sided opening provided with 5a. External connection terminals 6 are respectively arranged before and after the bending and breaking mechanism of each pole. The cover 7 fitted to the case 5 is the interphase wall 5a and side wall 5b of the case 5.
Is a box-like box having an interphase wall 7a, a side wall 7b, and an upper surface 7c having an operation handle hole 8, and the box body together with the case 5 by being fastened with screws 9 to the case 5. Make up. Each of the mating surfaces of the case 5 and the cover 7 has an opening 10a located in the vicinity of the mounting portion of the external connection terminal 6 and facing the pair of interphase walls 5a, 7a adjacent to the side walls 5b, 7b. A semi-disc shaped groove 10 is formed. Then, by utilizing these grooves 10 and attaching a bridge member 11 which is a member separate from the housing, the interphase wall 5
The a, 7a and the side walls 5b, 7b are connected. The bridging member 11 is formed of a steel material having a strength higher than that of the synthetic resin forming the housing or a ceramic material when insulation is required, and has a rod shape having disc-shaped brim portions 11a at both ends. Has been formed.

In assembling the bridging member 11 into the housing, first, a not-shown breaking mechanism and other storage parts are incorporated between the interphase walls and between the interphase wall and the side wall in the case 5, and then the side wall 5b of the case 5 and The disc-shaped brim portion 11a of the bridge member 11 is fitted into the groove 10 of the interphase wall 5a simply, and then the groove 10 provided in the cover 7 is fitted to the brim portion 11a, and the cover 7 is screwed with the screw 9. This is done by attaching it to the case 5.
Thereby, the bridge member 11 is fixed to the case 5 and the cover 7, and the interphase walls 5a, 7a and the side walls 5b, 7b are reinforced.

According to this embodiment, the interphase walls 5a, 7a and the side walls inside the housing
Since the reinforcing bridging member 11 is provided between the 5b and 7b, the side walls 5b and 7b of the case 5 and the cover 7 are prevented from expanding outward and deforming even with a large internal pressure due to the arc pressure at the time of breaking or breaking. To be done. Further, since the groove 10 formed on the mating surface of the case 5 and the cover 7 is used for connection by the bridge member 11, it is possible to reduce the wall thickness as compared with the case of being reinforced by the conventional screw mounting. Becomes Further, the bridge member 11 has a simple structure and can be easily incorporated.

In this embodiment, the brim portion of the bridging member has a disc shape. However, the bridging member may have a polygonal shape, and the bridging member may have a tip as shown in FIGS. 4 and 5. The same effect can be obtained by using a bent bar member 12 and a plate member 13 whose tip is bent. Further, the same effect can be obtained by using a part of the frame body of the bending mechanism as a bridge member. Further, in the above-mentioned embodiment, the groove is provided in both the case and the cover, but the same reinforcing effect can be obtained even if the groove is provided in either one and the bridge member is fitted therein.

[Advantages of the Invention] In the present invention, since the side wall of the housing and the interphase wall opposite thereto are connected by the bridge member at the mating surface of the case and the cover, the side wall is not thickened even with a large internal pressure at the time of breaking or breaking. A high-strength housing that can withstand is obtained with a simple structure, and assembly can be performed very easily.

[Brief description of drawings]

FIG. 1 is a partially cutaway plan view showing an embodiment of the circuit and disconnector housing of the present invention, FIG. 2 is a partial sectional view taken along the line II-II of FIG. 1, and FIG. FIG. 1 is a perspective view of a bridging member applied to FIG. 1, FIGS. 4 and 5 are perspective views showing another embodiment of the bridging member, and FIGS. 6 and 7 are conventional casings for circuits and circuit breakers. It is a partially broken plan view showing. 5 ... Case, 5a, 7a ... Interphase wall, 5b, 7b ... Side wall, 7
...... Cover, 9 ...... screw, 10 ...... groove, 10a ...... opening, 1
1, 12, 13 …… Bridge member, 11a …… Brim part.

Claims (1)

[Scope of utility model registration request] 1. A case formed of synthetic resin, having an interphase wall therein, and housing a squeezing and breaking mechanism between the interphase wall and the side wall, and an interphase wall of the case formed of synthetic resin and internally. In a casing of a circuit or disconnector configured by combining an interphase wall fitted to a side wall and a cover having the side wall, a side wall of the casing and an interphase wall opposite to the side wall of the case are formed at a mating surface of the case and the cover. A casing for a circuit or a breaker characterized by being connected by a bridge member which is a member separate from these walls.