JPH0745870Y2 - Arc extinguishing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to an arc extinguishing device used for a breaker.

[Prior Art] A conventional breaker is shown in FIG. As shown in FIG. 4, the power supply terminal 32 to which the power supply line of this breaker is connected has a terminal plate 13 having a substantially Z shape, and a terminal screw having a washer attached to one end of the terminal plate 13 is attached. It is composed of 35 and a nut 36. A fixed contact 12a is fixed to the other end of the terminal plate 13, and a contact 12 is formed by the movable contact 12b fixed to one end of the movable contactor 11 which is rotated by the opening / closing mechanism section A. When the contact 12 is opened / closed. An arc extinguishing device 1 for extinguishing the generated arc is provided. The arc-extinguishing device 1 includes an insulating box 5 having a box-like shape that opens downward, and an arc-extinguishing grid 6 provided therein, and a pair of upper and lower arc traveling plates 2 for guiding an arc into the insulating box 5.
And arc-extinguishing side plates 3 made of an insulating material and arranged on both sides of the arc traveling plate 2 to prevent the arc gas from flowing out to the side.

Here, as shown in FIG. 4, the arc traveling plate 2 on the fixed contact 12a side has a horizontal piece 2a placed on the fixed contact 12a of the terminal plate 13 near the terminal screw 35 and the horizontal piece 2a. 30 ° from part 2a
It is composed of an inclined portion 2b which is inclined and raised at an angle of -60 ° and a vertical piece portion 2c which is vertically raised from the tip of the inclined portion 2b. Then, in the portion of the terminal plate 13 where the horizontal piece portion 2a of the arc traveling plate 2 is placed, slits 7 are formed on both sides along the horizontal piece portion 2a, and the lower portions are inserted into the slits 7, respectively. And a pair of arc-extinguishing side plates 3 are installed upright.
A gap is formed on both outer side surfaces of these arc-extinguishing side plates 3, and fixed contact portions 12a of both arc-extinguishing side plates 3 are notched, whereby gaps and notches 3a formed on both outer sides of arc-extinguishing side plate 3 are formed. The arc gas generated by the generation of the arc when the contact 12 is opened and closed is circulated so that the arc can be satisfactorily guided to the arc extinguishing grid 6.

[Problems to be Solved by the Invention] However, in such an arc-extinguishing device 1, positioning of the arc-extinguishing side plate 3 is insufficient, and therefore the arc-extinguishing side plate 3 is prone to fall down. For this reason, a tool such as tweezers is used. It is necessary to assemble the arc extinguishing device 1, and there is a problem that the assembling work becomes complicated. In addition, due to thermal shock and gas pressure at the time of short circuit, the arc-extinguishing side plate 3
In some cases, cracks occurred in the.

The present invention has been made in view of the above points, and an object thereof is to provide an arc-extinguishing device that is easy to assemble and that can prevent cracking of the arc-extinguishing side plate during a short circuit. It is in.

[Means for Solving the Problems] In order to achieve the above object, the present invention forms a flexible holding piece on the arc traveling plate for holding the outer surface of the arc extinguishing side plate from the outside.

When it is desired to increase the driving force of the arc of the arc extinguishing device, the arc traveling plate may be made of a magnetic material.

Further, in order to improve the circulation efficiency of the arc gas, the holding piece may be formed in a shape that guides the arc gas to the notch formed by notching the contact portion of the arc extinguishing side plate for the circulation of the arc gas.

[Operation] The present invention is configured as described above, and by holding the outer surface of the arc-extinguishing side plate by the holding piece of the arc traveling plate,
Prevent the arc-extinguishing side plate from falling outward, and position it sufficiently to facilitate assembly.
Further, since the holding piece of the arc traveling plate has flexibility, the impact at the time of short circuit can be weakened by the holding frame and the arc extinguishing side plate can be prevented from cracking.

[Embodiment] FIGS. 1 and 2 show an embodiment of the present invention. First, the breaker in which the arc extinguishing device according to the present invention is used
A brief description will be given according to the figure. In this breaker, the contact 12 can be opened and closed by remote control in a remote control section C that operates according to a remote control signal.

The breaker housing 20 is composed of a body 21 for accommodating and arranging each component except the remote control section C, a cover 22 attached to the body 21, and a base 23 attached to the lower surface of the body 21. The remote control unit C is housed and arranged in the base 23.

The handle 10 has an operating portion protruding from the upper surface of the cover 22, and by rotating the handle 1 to the left in FIG. 2, the remote control portion C can be operated according to a remote control signal, and the opening / closing mechanism portion is opened. By driving A, the interlocking plate 31 is moved up and down, whereby the movable contactor 11 whose base end is rotatably supported is rotated, and the contact 12 can be opened and closed. There is. Here, this breaker has a three-pole structure, and the movable contactor of each pole is
11 is driven integrally by the interlocking plate 3.

The abnormal current detector B is a bimetal 41 that detects overcurrent.
And an electromagnet device 42 for detecting a short circuit current. Here, the electric circuit inside the breaker is the load terminal 33,
Coil 43 of electromagnet device 42, bimetal 41, movable contact 1
1, a contact 12, and a power supply terminal 32, and an excessive load current flowing in this electric path is applied to a bimetal 41 and an electromagnet device 42.
Detect with. Now, assuming that an excessive load current flows in the electric path, the bimetal 41 bends toward the opening / closing mechanism portion A side to trip the opening / closing mechanism portion A. When a short-circuit load current flows in the electric path, the output shaft 44 of the electromagnet device 42 is attracted, causing the opening / closing mechanism unit A to trip.

The remote control unit C includes an electromagnet device 45, and the contact 12 can be opened and closed by exciting or demagnetizing the coil 46 of the electromagnet device 45. Here, when the coil 46 of the electromagnet device 45 is excited by the remote control signal, the movable iron core 48 is driven so as to be attracted to the fixed iron core 47, and the conversion device 49 connected to the movable iron core 48.
The horizontal movement of the movable iron core 48 is converted into a vertical movement by means of which the interlocking plate 31 to which the other end of the conversion device 49 is connected is moved downward so that the contact 12 can be closed by remote control. It has become. Also, the coil 46
The contact 12 can be opened by degaussing.

Hereinafter, the arc extinguishing device 1, which is the gist of the present embodiment, will be described. Since the arc-extinguishing device 1 of this embodiment basically has the same structure as that of the conventional one, only the characteristic parts of this embodiment will be described below. In this embodiment, the arc traveling plate 2 is provided with holding pieces 2d for holding the respective outer side surfaces of the arc-extinguishing side plates 3 which are installed upright in the slits 7 formed in the terminal plate 13. The arc extinguishing side plate 3 is prevented from falling outward by the piece 2d. Since the arc traveling plate 2 is formed of a flexible material, the holding piece 2d is also flexible, and therefore acts to weaken the thermal shock and gas pressure applied to the arc extinguishing side plate 3 at the time of short circuit, As a result, cracking of the arc-extinguishing side plate 3 can be prevented.

By the way, the above-mentioned holding piece 2d is formed by notching the upper end of the tip in an arc shape, so that it is formed between the inner wall of the insulating box 5 constituting the arc extinguishing device 1 of the body 21 and the outer surface of the arc extinguishing side plate 4. The created gap allows the arc gas to satisfactorily flow back to the notch 3a formed in the contact portion of the arc-extinguishing side plate 3. Therefore,
The recirculation efficiency of the arc gas is improved.

When the arc traveling plate 2 is made of a magnetic material, the arc is extinguished by a large current flowing at the time of short circuit.
The magnetic force for driving in the direction of .alpha.

[Advantage of the Invention] As described above, in the present invention, since the arc traveling plate is formed with the holding piece for holding the outer surface of the arc-extinguishing side plate from the outside, the outer surface of the arc-extinguishing side plate is held by the holding piece. It is possible to prevent the arc-extinguishing side plate from falling outward, and therefore, the arc-extinguishing side plate is sufficiently positioned and the assembly is facilitated. Further, since the holding piece has flexibility, the holding frame can reduce the impact or the like at the time of a short circuit, and the cracks of the arc-extinguishing side plate can be prevented.

If the arc traveling plate is formed of a magnetic material, the magnetic force for driving the arc in the arc extinguishing grid direction is increased by the large current flowing in the holding frame at the time of short circuit, and therefore the arc driving force is increased and the arc extinguishing performance is good. Becomes

Further, in the shape of guiding the arc gas to the notch formed by notching the contact part of the arc-extinguishing side plate for the circulation of the arc gas, if the holding piece is formed, the arc gas can be favorably guided to the notch of the arc-extinguishing side plate, The recirculation efficiency of the arc gas can be increased.

[Brief description of drawings]

1 is an exploded perspective view of a main part of an arc extinguishing device according to an embodiment of the present invention, FIG. 2 is a sectional view of a breaker having the same as above, FIG. 3 is a sectional view of a conventional breaker, and FIG. FIG. 3 is an exploded perspective view of a main part of the arc extinguishing device. 1 is an arc extinguishing device, 2 is an arc traveling plate, 2a is a lateral piece, 2d is a holding piece, 3 is an arc extinguishing side plate, 3a is a notch, 6 is an arc extinguishing grid, 7
Is a slit, 12a is a fixed contact, and 13 is a terminal plate.

Claims (3)

[Scope of utility model registration request] 1. An arc-extinguishing grid, which is placed on a terminal plate having a fixed contact fixed to one end thereof, and which causes arcs generated when the contact is opened and closed by arc traveling plates arranged above and below the contact. In an arc-extinguishing device in which a pair of arc-extinguishing side plates are erected by forming slits on both sides of a portion of the terminal plate on which the arc traveling plate is placed and inserting the lower part into the slits while guiding the arc. An arc extinguishing device comprising a flexible holding piece for holding the outer side surface of the arc extinguishing side plate from the outside on the arc traveling plate. 2. The arc extinguishing device according to claim 1, wherein the arc traveling plate is made of a magnetic material. 3. The arc-extinguishing device according to claim 1, wherein a holding piece is formed in a shape for guiding the arc gas to a notch formed by notching the contact portion of the arc-extinguishing side plate for the circulation of the arc gas.