JPH086357Y2 - Multi-pole circuit breaker - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a multi-pole circuit breaker, and in particular, it is possible to check the operation of the switching mechanism during the assembly process and The present invention relates to a configuration of a multi-pole circuit breaker capable of preventing a decrease in insulation resistance during (between).

[Conventional technology]

As a conventional multi-pole circuit breaker of this type, those shown in FIGS. 3 to 5 are well known. FIG. 3 is a longitudinal sectional view of an essential part showing an outline of the configuration of a multi-pole circuit breaker, FIG. 4 is a perspective view of an upper case, and FIG. 5 is a perspective view of a lower case in which an opening / closing mechanism is housed.

As shown, the outer shell of the multi-pole circuit breaker is the upper case 1
And a lower case 2, and a partition wall 3 for inter-electrode insulation
In each of the chambers divided by, a fixed contactor 4 having a fixed contact 4a, a movable contactor 5 having a movable contact 5a, an opening / closing mechanism which is inserted into a recess 6 provided in the lower case 2 and fixed in position. The unit 7, an electromagnet device 8 for detecting an overcurrent, and the like are arranged. The insulation between the electrodes (between the adjacent electrodes) is maintained by the partition wall 3 for insulating the electrodes.

Reference numeral 9 denotes an interlocking lever for simultaneously tripping and operating the two opening / closing mechanism parts 7,7, which has two arms 91,91 engaged with the tabs 7a of the opening / closing mechanism part 7, and both end shaft parts 9a, 9a. 9a is inserted into a U-shaped support groove 2a formed on both side walls of the lower case 2, and a central portion 9b is inserted into a U-shaped support groove 3a formed in the middle stage of the inter-electrode insulating partition wall 3. At the same time, the lower case 2 is rotatably supported by being pressed by the shaft stopper 1a of the upper case 1.

[Problems to be solved by the invention]

By the way, the opening / closing mechanism 7 having a complicated structure often requires adjustment, and in order to improve productivity, the interlocking lever 9 is operated to normally operate the interlocking trip before assembling the upper case 1. Although it is preferable to check whether or not the operation is performed, in the conventional multi-pole circuit breaker, the central portion 9b of the interlocking lever 9 is connected to the shaft stopper 1a of the upper case 1.
Since it is configured to be pressed by, the operation check can be performed only after the upper case 1 is covered with the lower case 2.

Further, a minute melt or gas generated when a large current such as a short-circuit current is cut off from a gap between the inter-electrode insulating partition wall 3 and the interlocking lever 9 flows in and out between the divided chambers. As a result, there is a drawback that soot adheres particularly to the central portion 9b of the interlocking lever 9 and the insulation resistance between the poles is significantly reduced.

The present invention has been made in view of the above problems, and an object of the present invention is to enable an operation check whether or not the interlocking trip operation is normally performed in the process before assembling the upper case. An object of the present invention is to provide a multi-pole circuit breaker capable of preventing a decrease in insulation resistance between electrodes after short-circuit interruption.

[Means for solving problems]

The above-mentioned object is to divide the inside of one sealed case composed of an upper case and a lower case having a two-part upper and lower structure into a plurality of chambers by a partition wall for inter-electrode insulation, and to divide the plurality of chambers into a plurality of chambers. An opening / closing mechanism part is housed in each, and an interlocking lever that penetrates through the inter-electrode insulating partition wall and engages with the plurality of opening / closing mechanism parts is provided, and all the opening / closing mechanism parts are tripped and operated simultaneously by this interlocking lever. In the multi-pole circuit breaker configured as described above, the partition wall for inter-electrode insulation is provided in the lower case, and the opening / closing mechanism is fixed on the lower case, and the partition wall for inter-electrode insulation of the interlocking lever is further provided. A flange that closes the through hole of the partition wall is provided in the vicinity of the penetrating portion, and a supporting piece having bearing holes that open to the inside of both side walls of the lower case is provided to utilize the elasticity of the interlocking lever. Fitted to both end shaft portions from the inner side of the support piece to the bearing bore, it is achieved by rotatably supported to the interlocking lever by the lower case.

[Action]

In such a structure, by inserting both end shafts of the interlocking lever into the bearing holes of the support pieces provided on both side walls of the lower case, the interlocking lever is rotatably supported only by the lower case. Therefore, it is possible to check whether or not the interlocking trip operation is normally performed without assembling the upper case.

Further, since a flange is provided at a position close to the through hole formed in the inter-electrode insulating partition wall of the interlocking lever, a minute melt or gas generated at the time of interruption is blocked by this flange, and each chamber is blocked. There is no inflow or outflow between. Therefore, since soot does not adhere to the central portion of the interlocking lever, it becomes possible to maintain the insulation resistance between the electrodes in the initial state.

〔Example〕

Hereinafter, a preferred embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a longitudinal sectional view of an essential part showing an outline of the configuration of a multi-pole circuit breaker according to the present invention, and FIG. Incidentally, the same parts as those of the conventional example shown in FIGS. 3 to 5 are designated by the same reference numerals and the description thereof will be omitted.

As shown in FIGS. 1 and 2, the outer shell of the multi-pole circuit breaker according to the present invention is composed of an upper case 11 and a lower case 12.

The lower case 12 is integrally formed with a lower partition plate 121 extending in the longitudinal direction at the center of the inside thereof, and has supporting pieces 122 having bearing holes 122a formed on both side walls, and further, at both ends center. A guide 123 provided with a groove 123a is erected on this.

Reference numeral 13 denotes an upper partition plate, which is provided with projecting pieces 131 at lower ends of both ends, and a U-shaped notch 13a is provided in the vicinity of one projecting piece 131. Put the protrusion 131 of the upper partition plate 13 into the lower case 1.
By inserting into the groove 123a of the second guide 123, the partition wall 14 for inter-electrode insulation is formed and the inside of the circuit breaker is divided into two chambers. The lower end of the upper partition plate 13 and the lower partition plate 12
The cross-sectional shape of the upper end of 1 is a concave shape and a convex shape, respectively, and they are fitted together without a gap.

On the other hand, the interlocking lever 15 made of a material such as synthetic resin has insulating properties and moderate elasticity, and by utilizing the elasticity, the round shaft portions 15a at both ends are provided on the support piece 122 provided on the lower case 12.
The bearing hole 122a is fitted from the inside. As a result, the interlocking lever 15 is rotatably supported by the lower case 12 that fixedly supports the opening / closing mechanism. And
The two opening / closing mechanism parts 16 are simultaneously tripped and operated by an arm which is integrally formed with the interlocking lever 15 and which is arranged for each pole forming a pair with the upper arm 151 and the lower arm 152. Further, the interlocking lever 15 is provided at a substantially central portion thereof with a notch 13a of the upper partition plate 13 and a through hole 17 of an inter-electrode insulating partition wall 13 formed by an upper end portion of one side of the lower partition plate 121, and this penetrating hole. A flange 153 having a size that closes the gap with the hole 17 is integrally formed.

Here, the two-pole interlocking trip operation will be briefly described.
Now, when one of the electromagnet devices 8 detects an overcurrent, one end of the movable iron core 81 and the claw 16a of the trip device of the opening / closing mechanism part 16 come into contact with each other. Then, the shaft 161 of the opening / closing mechanism portion 16 moves upward in a circular arc, contacts the upper arm 151 of the interlocking lever 15, and pushes it upward. At this time, the interlocking lever 15 rotates around the shaft portions 15a at both ends supported by the support pieces 122 of the lower case 12, and accordingly, the lower arm 152 in the adjacent pole also rotates to close the circuit. The other opening / closing mechanism portion 16 is brought into contact with the claw 16a of the trip device. As a result, the opening / closing mechanism section 16 housed in each chamber is interlocked to perform the tripping operation.

By the way, in the multi-pole circuit breaker configured as described above, the interlocking lever 15 that engages with the opening / closing mechanism part 16 housed in the lower case 12 and operates the interlocking trip operation of the open / close mechanism part 16 has its both end shaft parts 15a in the lower case. Support pieces 122 provided on both side walls of 12
Since it is inserted into the bearing hole 122a of the and rotatably supported, the interlock lever
You can operate the 15 to perform operation tests and adjustments.

In addition, a partition wall for inter-electrode insulation is provided at approximately the center of the interlocking lever 15.
Proximity to 14 through holes 17 and interlocking lever with this through hole 17
Since the flange 153 having a size that closes the gap with the outer peripheral surface of 15 is provided and the insulating path is lengthened, inflow and outflow of gas between the poles (between the two poles) is prevented, and the interlock lever 15 of the interlocking lever 15 is prevented. Soot does not adhere to the central portion 15b, and the insulation resistance between the electrodes can be maintained in the initial state.

[Effect of device]

As is apparent from the above description, the multipole circuit breaker according to the present invention has the following unique effects.

Since the interlocking lever that engages with the open / close mechanism stored in each chamber is rotatably supported only by the lower case, it functions so that the operation test necessary for quality control in the process before assembling the upper case, Adjustments, etc. can be easily performed, and it can be expected to reduce defects and improve productivity.

A flange that closes the gap with the through hole is provided in the inter-electrode penetration portion of the interlocking lever that penetrates the inter-electrode insulating partition wall, and the insulation path is lengthened, so gas inflow and outflow between the electrodes is prevented, and interlocking is performed. Soot does not adhere to the gap between the poles of the lever, and the insulation resistance between the poles can be maintained in the initial state.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view of a main part of a multi-pole circuit breaker according to the present invention,
FIG. 2 is a perspective view of an essential part for explaining the operation of the multipolar circuit breaker shown in FIG. 1 during an interlocking trip operation, and FIG. 3 is a longitudinal sectional view of an essential part of a multipolar circuit breaker according to the prior art. FIG. 4, FIG. 5 and FIG. 5 are respectively a perspective view of an upper case of the multi-pole circuit breaker shown in FIG. 3 and a perspective view of a lower case in which the opening / closing mechanism portion is housed. 11: upper case, 12: lower case, 122: support piece, 122a: bearing hole, 14: partition wall for electrode insulation, 15: interlocking lever, 15a: shaft part,
153: Flange, 16: Open / close mechanism, 17: Through hole.

Claims (1)

[Scope of utility model registration request] 1. An inside of a closed case composed of an upper case and a lower case having a two-divided upper and lower structure is divided into a plurality of chambers by a partition wall for inter-electrode insulation. An opening / closing mechanism part is housed in each, and an interlocking lever that penetrates through the inter-electrode insulating partition wall and engages with the plurality of opening / closing mechanism parts is provided, and all the opening / closing mechanism parts are tripped and operated simultaneously by this interlocking lever. In the multi-pole circuit breaker configured as described above, the partition wall for inter-electrode insulation is provided in the lower case, and the opening / closing mechanism is fixed on the lower case, and the partition wall for inter-electrode insulation of the interlocking lever is further provided. A flange for closing the through hole of the partition wall is provided in the vicinity of the penetrating portion, and a supporting piece having a bearing hole opening to the inside of both side walls of the lower case is provided, which utilizes the elasticity of the interlocking lever. It fitted the end shaft portion from the inner side of the support piece to the bearing bore, a multipole circuit breaker, characterized in that formed by rotatably supported to the interlocking lever by the lower case.