JPH0625857Y2 - Electromagnetic contactor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to an electromagnetic contactor, and more particularly to a means for transferring an arc generated at the time of interruption in a large capacity thereof to an arc extinguishing plate of an arc extinguishing chamber.

[Conventional technology]

As a magnetic contactor with special consideration given to the transfer of the generated arc to the arc extinguishing plate, a fixed contact can be used, for example, as shown in the longitudinal sectional views of the main parts at the time of closing and opening in FIGS. 4 and 5. It is known that consideration is given to approaching the arc-extinguishing plate in a wide range. In the figure, a contactor device of an electromagnetic contactor includes two fixed contactors 1, 1 as a pair, a contactor support 2 and a movable contactor 3 supported in a groove of the contactor support 2, and a fixed contactor 1. , 1 and the arc-extinguishing chamber 4 covered with the movable contactor 3 constitute a main part. The fixed contacts 1 and 1 are L-shaped, and the vertical leg pieces are arranged to face each other with a gap. The fixed contacts 5 are fixed to the ends of the vertical leg pieces of the fixed contact pieces 1 and the lateral leg pieces, respectively. The piece is fastened to the terminal 6 with a screw 7. Although the lower end of the contactor support 2 is not shown, it is connected to a driving device such as an electromagnet. The movable contactor 3 is provided with contact springs 9 to which movable contacts 8 are fixed at both ends. The arc-extinguishing chamber 4 has fixed contacts 5, 5 and movable contacts 8,
Outside the contact portion with 8, the arc-extinguishing plate 10 which is parallel to the contact surface and is opposed to each other and is stacked at intervals, and is provided above the arc-extinguishing plates 10 and 10 on both sides to connect both sides. Bridge panel 11
It has and. The arc-extinguishing plates 10, 10 located on the lowermost side of both sides can be approached within the range of the same level as the contact surfaces of the fixed contacts 5, 5 and the movable contacts 8, 8.
The arc generated at the time of interruption is blown between the arc extinguishing plates 10 to be cooled.

[Problems to be solved by the invention]

In such a conventional device, when the breaking capacity becomes as large as several hundreds to tens of thousands amperes, naturally the energy at the time of breaking also becomes large, and the fixed contact is made at the moment when the arc is blown into the space of the arc extinguishing plate 10. Outer corners 1a, 1 of the child 1, 1
concentrate on a. Since the fixed contacts 1 and 1 are generally made of copper, they have a low melting point. Therefore, there is a drawback in that the concentrated portion of the arc is melted and ionized, which deteriorates the breaking performance.

An object of the present invention is to eliminate the above-mentioned conventional drawbacks, and to provide a large-capacity electromagnetic contactor having stable improved breaking performance without increasing the size and cost.

[Means for solving problems]

In order to achieve the above-mentioned object, the present invention has a pair of fixed contacts, which are L-shaped and have vertical leg pieces arranged to face each other and each lateral leg piece is fastened to a terminal by a fastening screw. A contact support which is reciprocally guided between the pair of fixed contacts and has a groove along one end thereof along the axis of the fixed contact, and the other end of which is guided by the groove of the contact support. A movable contactor that opens the bridge between the fixed contacts by the driving device, and an outer side of a contact surface between the movable contact of the movable contactor and the fixed contact of the fixed contactor that is covered by the movable contactor and the fixed contactor. And an arc-extinguishing chamber having arc-extinguishing plates which face each other in parallel with each other in parallel with the contact surface and are stacked at a distance, and are clamped together with the fastening screw of the fixed contact, The upper leg with the screw head of the fastening screw and the lower leg with the screw of the fastening screw. There is the provision of the arc transition plate by magnetic material overlapping with the arc extinguishing plates closely spaced than the opening distance has an insertion through hole that allows each.

[Action]

In the electromagnetic contactor according to the present invention, by providing the arc transfer plate made of a magnetic material which is fastened together with the screw fastening portion between the fixed contact and the arc extinguishing plate, the arc is extinguished without being concentrated at one place. The cooling arc is extinguished by being driven by the arc plate.

〔Example〕

1 to 3 are views showing an embodiment of an electromagnetic contactor according to the present invention. FIG. 1 is a longitudinal sectional view of an essential part in a closed state, and FIG. 2 is a longitudinal sectional view of an essential part in an opened state. FIG. 3 is an enlarged perspective view of a main part. In the figure, the same parts as those of the conventional device of FIG. This embodiment is different from the conventional device in that the outer end faces of the fixed contacts 1 and 1 and the arc extinguishing plate 1 of the arc extinguishing chamber 4 are different.
The arc transfer plate 12 that is fastened together by the screw 7 is provided in the gap between 0 and 10. The arc transfer plate 12 is formed of a magnetic material in a U-shape, and its height H is at the same level as the end of the vertical leg of the fixed contact 1, and the upper leg of the arc extinguishing plate 10, 10.
On the lower side, there is a dimensional relationship such that they are opposed to each other with a large overlap L at a gap g that is much smaller than the opening distance G. The arc transfer plate 12 is provided with through holes 12a, 12b through which the head portion 7a of the screw 7 can be inserted, and through which the screw portion 7b of the screw 7 can be inserted.

In the above configuration, the arc when breaking is fixed contactor 1,1
And the magnetic flux due to the current flowing through the arc transfer plates 12 and 12,
The arc-extinguishing plates 10 and 10 are sprayed at intervals so that the arcing points are fixed contact points 5 and 5-outer corners 1a and 1a of the fixed contactors 1 and 1-arc transfer plate 12 and 12-arc-extinguishing plate 10 and Driven to 10. Then, the driven arc sequentially reaches the upper side through the arc transfer plates 12 and 12 and the lower arc extinguishing plates 10 and 10 located closest to the arc transfer plates 12 and 12, and is cooled and extinguished during the period. Further, since the arc transfer plates 12 and 12 are housed in the space occupied by the fixed contacts 1 and 1 and are fastened together by the fastening screws 7, the electromagnetic contactor is not enlarged, and It can contribute to the cooling effect of the fixed contacts 1 and 1.

The magnetic material is adopted for the arc transfer plate 12 because iron, nickel, etc., which are generally called magnetic materials, have a melting point of 1000
This is due to the fact that iron etc. is about 1.5 times higher at around 1500 ° C than around ℃, and the arc is opened by reducing the gap g between arc extinguishing plate 10 and arc transfer plate 12 with respect to the opening distance G. There is no backflow to the poles, and the effect of arc point transfer is great.

[Effect of device]

According to this invention, the upper end of the arc contact plate is located on the same level surface as the fixed contact surface of the fixed contact, and is fixed together with the fixed contact by an arc transfer plate made of a U-shaped magnetic material. With the configuration provided between the electromagnetic contactor and the electromagnetic contactor, the breaking performance is stable and improved in a large capacity area without changing the shape and dimensions of the existing electromagnetic contactor, and thus without increasing the size of the electromagnetic contactor. Can be provided.

[Brief description of drawings]

1 to 3 are views showing an embodiment of an electromagnetic contactor according to the present invention. FIG. 1 is a longitudinal sectional view of an essential part in a closed state, and FIG. 2 is a longitudinal sectional view of an essential part in an opened state. FIG. 3 is an enlarged perspective view of an essential part, FIGS. 4 and 5 are views showing an example of a conventional electromagnetic contactor, FIG. 4 is a longitudinal sectional view of an essential part at the time of closing, and FIG. It is a longitudinal cross-sectional view of a main part at the time of separation. 1 ... Fixed contact, 2 ... Contact support, 2a ... Groove, 3
...... Movable contactor, 4 ...... arc extinguishing chamber, 6 ...... terminal, 7 ...... screw, 10 ...... arc extinguishing plate, 12 ...... arc transition plate, 12a, 12b ......
Through hole.

Claims (1)

[Scope of utility model registration request] 1. A pair of fixed contacts, which are L-shaped and have longitudinal leg pieces arranged to face each other with a gap and each lateral leg piece is fastened to a terminal by a fastening screw, and between the pair of fixed contact pieces. A reciprocally guided groove on one end of the fixed contact, which extends along the axis of the fixed contact, and the other end is connected to a drive device; and the fixed contact by the drive device guided by the groove of the contact support. A movable contactor bridging and opening between the children and an outer side of a contact surface between the movable contact of the movable contactor and the fixed contact of the fixed contactor which is covered with the movable contactor and the fixed contactor and is parallel to the contact surface. And an arc-extinguishing chamber having arc-extinguishing plates that are opposed to each other and are spaced apart from each other, and are fastened together with the fastening screw of the fixed contact to form a U-shape on the upper leg piece. The screw head of the fastening screw is a through hole that allows the threaded portion of the fastening screw to pass through the lower leg piece. Electromagnetic contactor, characterized in that a arc transition plate closely spaced than the opening distance has a hole by magnetic material overlapping with the extinguishing plate.