JP3267660B2 - Electromagnetic contactor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic contactor having a hinged movable iron piece.

[0002]

2. Description of the Related Art An electromagnetic coil is inserted into a central leg of an E-shaped fixed iron core supported on a lower case, and a hinge-shaped movable iron piece having an end surface of one outer leg of the fixed iron core as a fulcrum slides on the upper case. An electromagnetic contactor for operating a movable contact support movably held is generally known, and is disclosed in Japanese Patent Publication No. 1-36.
No. 216, Japanese Utility Model Laid-Open No. 57-180941, Japanese Utility Model Laid-Open No. 58-26146, and the like.

[0003]

The upper case of an electromagnetic contactor having a hinge-shaped movable iron piece is usually provided with an upper case.
An insulating plate that separates the movable contact support from the electromagnetic coil is mounted, and the opening and closing of the contacts for each phase is surrounded by the upper case and the insulating plate, and is separated by a phase separation wall integral with the upper case. Each is done within. However, in such an electromagnetic contactor, conventionally, when a large current is cut off, a generated short-circuit accident may occur when the generated arc gas enters each other's switching space between the phases. Accordingly, an object of the present invention is to provide an electromagnetic contactor that prevents a short circuit between phases due to invasion of arc gas.

[0004]

[Means for Solving the Problems] In order to solve the above-mentioned problems
According to the present invention, an electromagnetic coil is inserted into a central leg of an E-shaped fixed core supported by a lower case, and a hinge-shaped movable iron piece having an end surface of one outer leg of the fixed core as a fulcrum is attached to the upper case. with operating the slidably retained movable contact support, the insulating plate separating between said movable contact support and the movable iron piece is mounted on the upper case, before
The movable contact support has a plurality of fixed to the upper case.
Multi-phase movable contact is held relative to fixed-phase contact
And surrounded by the upper case and the insulating plate
The space is defined by the interphase walls integral with the upper case.
Opening and closing space in which the movable contact and the fixed contact are accommodated.
In There electromagnetic contactor which is divided, the near movable contact of the insulating plate, in said arc gas at the time of current interruption lower case
A vent hole for exhausting the gas shall be provided.

[0005]

[Function] Conventionally, the space surrounded by the upper case and the insulating plate is almost closed, so the arc gas must be treated only in that space, and the internal pressure rises excessively and the arc gas moves between the phases. did. According to the present invention, a gas vent hole is provided near the movable contact of the insulating plate to discharge arc gas to the outside of the open / close space so as to prevent intrusion between phases.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. Here, FIG. 1 is a longitudinal sectional view of the electromagnetic contactor in a released state, FIG. 2 is a sectional view taken along the line II-II, FIG. 3 is an exploded perspective view of a main part of FIG. 1, and FIG. FIG. 5 is an enlarged perspective view of the metal fitting, FIG. 5 is a perspective view showing the appearance of the electromagnetic contactor of FIG. 1, and FIG. 6 is a partial cross-sectional view along the line VI-VI. First, in FIGS. 1 to 3, reference numeral 1 denotes a lower case, 2 denotes an upper case connected thereto, 3 denotes an E-shaped fixed core housed in the lower case 1, and 4 denotes a central leg 3 a of the fixed core 3. The magnet coil 5 is a hinge-shaped movable iron piece having the end surface of the outer leg 3b on one side (the right side in FIG. 1) of the fixed iron core 3 as a fulcrum, and 6 is a front end of the contact pole portion 5b of the movable iron piece 5 and the lower case 1.
A compression coil spring obliquely inserted between
A return spring 7 is a movable contact support slidably held in the upper case 2 in the left-right direction of FIG. 1, and 8 is a spring receiving projection 9 inside the upper case 2 and a spring receiver on the upper part of the movable contact support 7. This is a second return spring composed of a compression coil spring inserted between the projection and the projection.

As shown in FIG. 3, the electromagnetic coil 4 is formed by winding a winding 12 around a rectangular spool 11, and a lead wire 12a of the winding 12 is connected to a tie terminal 13a of a terminal fitting 13 (FIG. 4). It is kinked. Spool 11 is lower case 1
A pair of support projections 1 integrally formed facing the inside of the side wall
4 and is supported by the lower case 1. At this time, two parallel positioning protrusions 15 formed on the bottom surface of the lower flange cover the support protrusions 14 and are positioned in the front-rear direction (FIG. 1).
(Left-right direction). Spool 11
A pair of side walls 16 are raised on the left and right sides of the upper flange, and the terminal fittings 13 are inserted from sideways into slits 17a cut in accordance with the contours of the terminal fittings 17 integrated with the side walls 16. Has been held. The terminal fitting 13 has a tongue piece 13b (FIG. 4) cut and bent to one side fitted into the concave portion 17b of the terminal fitting mounting portion 17, and is positioned in the front-rear direction.

On the other hand, the fixed iron core 3 inserted into the lower case 1 has a side serving as a fulcrum of the movable iron piece 5, that is, the bottom surface on the outer leg 3b side is in contact with the step 1a on the bottom surface of the lower case 1, and the other outer leg 3c. The bottom surface on the side is cantilevered so as to rise from the bottom surface of the lower case 1 as shown in FIG.
Further, a moderate play is provided between the central leg 3a of the fixed core 3 and the center hole of the spool 11 through which the fixed core 3 penetrates, and between the periphery of the fixed core 3 and the inner wall surface of the lower case 1.
The movable iron piece 5 that rotates about the end face of the outer leg 3b of the fixed iron core 3 has arms 5a projecting to both sides rotatably inserted into grooves 18 provided inside the side wall of the lower case 1 so as to face each other. Front-back and left-right positioning is performed.

A spring receiving projection 5c is provided at a front end of the armature 5b of the movable iron piece 5, and the first return spring 6 is connected to the spring receiving projection 5c and the spring receiving projection 1 inside the lower case 1.
9 are fitted at both ends. A pair of left and right spring holding projections 20 are provided inside the lower case 1 above the spring receiving projections 19, and the first return spring 6 has a linear line formed by the spring holding projections 20 and the spring receiving projections 19. And the upward lifting is suppressed.

Reference numeral 21 denotes an insulating plate which separates the electromagnetic coil 4 and the movable contact support 7 from each other, and is fitted to the bottom of the upper case 2 via four dovetail-shaped projections 21a shown in FIG. I have. The movable contact support 7 holds a multi-phase movable contact 22 having movable contacts 22 a (FIG. 2) at both ends together with a contact spring 23, and the upper case 2 faces each movable contact 22, Fixed contact 24a
A pair of left and right fixed contacts 24 having the same number of phases as the movable contact 22 having (FIG. 2) are fixed.

The space in which the movable contact support 7 is held is surrounded by the upper case 2 and the insulating plate 21, and this space is defined by the movable contact 22 and the fixed contact of each phase by the phase spacing wall 25 integral with the upper case 2. 24 is partitioned into an open / close space 26 in which is accommodated. In the vicinity of the movable contact 22 of the insulating plate 21, a gas vent hole 27 composed of four small holes is formed in each open / close space 26. Reference numeral 28 denotes a coil terminal which is fixed to the upper case 2 so that the contact piece 13c of the terminal fitting 13 elastically contacts.

As shown in FIG. 1, the arm 5a of the movable iron piece 5 fitted in the groove 18 is held by a holding portion 16a formed on the side wall 16 of the spool 11. The spool 11 receives a force from the upper case 2 via the insulating plate 21 on the upper surface of the side wall 16 and is pressed and fixed to the support projection 14. The movable iron piece 5 receives a force from the first return spring 6 in the clockwise direction in FIG.
The position of the stopper 21a is regulated by hitting a stopper 21a integrally formed with the stopper 1. The operating portion 5d of the movable iron piece 5 is inserted into the concave portion 7a of the movable contact support 7, and receives a force from the second return spring 8 in the rightward direction in FIG.
Is restricted in position by abutting the operation unit 5d.

As shown in FIG. 3, a pair of front and rear connection pieces 29 in the form of a frame are integrally formed in the upper portions of the left and right side walls of the lower case 1, respectively, and a recess 30 is provided therebetween. On the other hand, as shown in FIG. 5, trapezoidal projections 31 are formed on the left and right side surfaces of the upper case 2 corresponding to the recesses 30.
The connecting pieces 29 of the lower case 1 are provided on both sides of the convex portion 31.
And a connection projection 32 that engages with the second projection. The lower case 1 and the upper case 2 are configured such that the convex portions 31
5 and press-spread out the connecting pieces 29 with the inclined surfaces 32a (FIG. 6) of the connecting protrusions 32, and are connected to each other without using screws as shown in FIG.

In such a configuration, when the electromagnetic coil 4 is excited, the movable iron piece 5 is attracted to the fixed iron core 3 against the return springs 6 and 8, and the movable contactor support 7 is moved by the operating portion 5d as shown in FIG. The movable contact 22a is pushed to the left to contact the fixed contact 24a. When the excitation is released, the movable iron piece 5 is returned to the illustrated state by the return springs 6 and 8, and the movable contact 22a is opened.

When a large current is interrupted, the contacts 22a,
An arc is generated between the electrodes 24a, and at the same time, a conductive high-temperature gas (arc gas) is generated due to evaporation of the contact material, and the open / close space 26a is opened.
Internal pressure rises. This arc gas has conventionally been used
There is a danger of invading adjacent phases through the gap 33 of FIG. However, according to the illustrated configuration, the arc gas is discharged into the wide space in the lower case 1 through the gas vent hole 27, so that an increase in the internal pressure of the open / close space 26 is suppressed, and no interphase short circuit occurs. The gas vent hole 27
Is too large, the gases discharged from this may come into contact with each other to cause a short circuit. Therefore, it is better to be as small as possible within a limit that can prevent intrusion of arc gas between phases. For example, in an electromagnetic contactor having a rated current of 11 A, a small hole having a diameter of about 1 mm is provided for each phase and a wall thickness between holes is set to about 1 mm as shown in the figure. It is good to open about four.

[0016]

According to the present invention, by providing a gas vent hole in the insulating plate of the upper case to discharge the arc gas, there is no fear of occurrence of a short circuit between the phases due to the arc gas even when a large current is interrupted.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a released state of an electromagnetic contactor according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along the line II-II in FIG.

FIG. 3 is an exploded perspective view of a main part of FIG.

FIG. 4 is an enlarged perspective view of a connection fitting in FIG. 3;

FIG. 5 is a perspective view showing an appearance of the electromagnetic contactor of FIG. 1;

FIG. 6 is a partial sectional view taken along the line VI-VI of FIG. 5;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Lower case 2 Upper case 3 Fixed iron core 4 Electromagnetic coil 5 Movable iron piece 7 Movable contact support 21 Insulating plate 27 Gas vent hole

Claims (1)

(57) [Claims] An electromagnetic coil is inserted into a center leg of an E-shaped fixed core supported by a lower case, and a hinge-shaped movable iron piece having a fulcrum at an end face of one outer leg of the fixed core slides on the upper case. Operate the movable contact support that is movably held .
Rutotomoni, insulating plate separating between said movable contact support and the movable iron piece is mounted on the upper case, the accessibility
The multi-phase fixed to the upper case is
A multi-phase movable contact is held relative to the fixed contact,
And a space surrounded by the upper case and the insulating plate.
Is in front of each phase by a phase spacing wall integral with the upper case.
The open / close space where the movable contact and fixed contact are stored
In bounded electromagnetic contactor, near the movable contact of the insulating plate, arc gas at the time of current interruption
A gas vent hole for discharging gas into the lower case .