JPH113644A - Electromagnetic contactor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the stability at the time of attracting a movable iron piece to a fixed iron piece, and improve the contact condition of contacts with each other by providing a stage difference in a bottom surface of a lower case, and forming a part just under a groove higher than a part as a tip of a lateral arm, and forming width of a lateral arm of the movable iron piece so that width of a tip is wider than that of a shaft part. SOLUTION: In a lateral arm 72 of a movable iron piece 7, width of a tip part 72a is formed wider than that of a shaft part 72b as the center of turning so as to obtain a large kinetic energy at the time of turning the movable iron piece 7 with the excitation of a coil. With this structure, the lateral arm 72 is stably attracted to a fixed iron piece 61 for abutment. At this stage, the fixed iron piece 61 is turned around the position of a step 13 at the bottom surface of a lower case 12, and the impact force at the time of abutment of the movable iron piece 7 is lowered. In a spool 62, a top surface of an upper end flange part 61b and a lower surface of a lower end flange part 62c are formed into inclined surfaces so that the movable iron piece 7 is hard to abut on the upper end flange part 62b of the spool 62 at the time of turning the movable iron piece 7 and the fixed iron piece 61.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic contactor used for opening and closing a motor and the like.

[0002]

2. Description of the Related Art FIG. 4 is a schematic structural view showing the inside of a housing of a conventional electromagnetic contactor. The housing 1 includes an upper case 11 and a lower case 12, and the upper case 11
An insulating plate 2 is fixed to the lower end of the base, and a contact support 3 is mounted on the insulating plate 2 so as to be movable left and right. A movable contact 32 is attached to the contact support 3 via a contact spring 31, and a return spring 4 is interposed between the contact support 3 and the upper case 11. In the upper case 11, a fixed contact 5 fixed to the upper case 11 side is disposed at a position facing the left side of the movable contact 32.

In the lower case 12, an electromagnet including a fixed iron core 61, a spool 62 and a coil 63 is housed. The fixed iron cores 61 are arranged at predetermined intervals.
The spool 62 is composed of book legs 61a, 61b, 61c and a yoke 61d connecting these lower ends. A spool 62 having flanges 62b, 62c at upper and lower ends of a cylindrical body 62a is attached to a central leg 61b. I have. A coil 63 is wound around the cylinder 62a of the spool 62.

[0004] A side plate 8 is provided on the upper end flange 62b of the spool 62 so as to sandwich both sides of a movable iron piece 7 described later. A groove member 81 having a groove 81a for fitting the shaft 71 of the movable iron piece 7 is provided at a position above the right leg 61c of the fixed iron core 61. The groove member 81, the side plate 8, and the spool 62 are integrally formed.

FIG. 5 is a perspective view of the movable iron piece. The movable iron piece 7 is rotated by the operation of the electromagnet to move the contact support 3, and is fitted into the groove 81a of the groove member 81. A pair of shaft portions 71, a lateral arm 72 disposed between the fixed iron core 61 and the insulating plate 2 and extending in the lateral direction, and bent in a “V” shape diagonally upward and inward (left side) from the right end of the lateral arm 72. And a vertical arm 73 whose tip is slightly outwardly bent. The tip of the vertical arm 73 is located in the groove 33 of the contact support 3 in the upper case 11 and is in contact with the contact support 3.

Therefore, when the coil 63 is excited,
Since the horizontal arm 72 of the movable iron piece 7 is attracted to the fixed iron core 61 and rotates counterclockwise around the shaft portion 71, the vertical arm 73
Moves the contact support 3 to the left. Thereby, the movable contact 32 moves and comes into contact with the fixed contact 5, and the main circuit is closed. Here, the contact spring 31 constantly urges the movable contact 32 to the left to maintain good contact between the contacts.

When the excitation of the coil 63 is stopped, the fixed core 6
Since the suction force of 1 is lost, the return spring 4 moves the contact support 3 to the right. As a result, the movable iron piece 7 rotates clockwise, the movable contact 32 separates from the fixed contact 5, and the main circuit is opened.

[0008]

In such an electromagnetic contactor, there is room for improvement in the conventional movable iron piece in terms of stability when attracted by a fixed iron core.

On the other hand, the clearance (at the time of separation) and the degree of contact (at the time of contact) between the fixed contact and the movable contact are assembling accuracy of the lower case and the upper case forming the housing, the fixed iron core and the spool in the lower case. It is determined by the installation position, the position of the groove on the spool side, the gap between the groove and the shaft of the movable iron piece, the dimensional accuracy of each component, and the like.
The gap and the degree of contact may greatly deviate from the design values and affect the contact / separation performance.

The present invention has been made in view of such problems of the prior art, and improves the stability of a movable iron piece when attracted to a fixed iron core to improve the contact state between contacts. It is another object of the present invention to reduce variation in the arrangement accuracy of a spool in a housing and improve the contact / separation performance between a fixed contact and a movable contact.

[0011]

According to a first aspect of the present invention, a housing includes an upper case and a lower case, and fixed contacts are mounted in the upper case. In addition, a contact support having a movable contact that comes into contact with and separates from the fixed contact is housed, and a fixed iron core and a spool attached to the fixed iron core and having a flange at upper and lower ends of a cylindrical body are housed in the lower case. An electromagnet composed of a coil wound around the spool is housed, and a lateral arm extending laterally above the electromagnet in the lower case, and a tip extending upward from one end of the lateral arm and having a tip in the upper case. A movable armature composed of a vertical arm that abuts the contact point support and a shaft part that is fitted in a groove provided in the upper part of the spool and serves as a rotation axis, with the shaft part fitted in the groove as a fulcrum. By rotating, contact support In the electromagnetic contactor where the fixed contact and the movable contact move and move away from each other, a step is provided on the bottom surface of the lower case so that the part directly below the groove is higher than the part on the tip side of the horizontal arm and the movable iron piece The width of the lateral arm of the electromagnetic contactor is formed so that the tip side is wider than the shaft side.

According to this electromagnetic contactor, since the width of the tip of the lateral arm of the movable iron piece is wider than the width of the shaft, the kinetic energy when the movable iron piece rotates with coil excitation increases.
The movable iron piece is stably attracted to the fixed iron core and comes into contact with the fixed iron core. Further, with the contact of the movable iron piece, the fixed iron core also rotates around the step provided on the bottom surface of the lower case. Thereby, the impact force when the movable iron piece abuts on the fixed iron core is reduced, so that the contact state between the contacts due to the rotation of the movable iron piece is stabilized, and the contact performance is improved.

If the flatness of the lower surface of the horizontal arm is poor and the surface roughness has a large variation within the surface, a large variation occurs in the holding force of the horizontal arm when the movable iron piece is attracted to the fixed iron core. However, if the width of the tip of the side arm of the movable iron piece is wider than the width of the shaft side, the flatness of the wide side surface will be reduced when the movable iron piece is formed by pressing. Since the movable iron piece can be improved, the holding force of the horizontal arm when the movable iron piece is attracted to the fixed iron core is less likely to vary, and the contact life is improved.

According to a second aspect of the present invention, in the electromagnetic contactor according to the first aspect, a protrusion or a recess is provided outside a member integrated on an upper end of the upper end of the spool, and the upper case and the lower case are provided. At least one of the inner surfaces is provided with an engaging portion for engaging with the convex portion or the concave portion.

According to this electromagnetic contactor, since the spool is easily positioned with respect to the upper case and / or the lower case, the dispersion of the arrangement accuracy of the spool in the housing is reduced.

[0016]

Embodiments of the present invention will be described below. FIG. 1 is a schematic configuration diagram showing an electromagnetic contactor corresponding to one embodiment of the present invention, FIG. 2 is a perspective view showing a movable iron piece, and FIG. 3 is a plan view showing an attached state of a spool to a lower case. FIG.

The electromagnetic contactor of FIG. 1 is the same as the above-described conventional electromagnetic contactor shown in FIG. 4 except for the shape of the movable iron piece, the spool structure, and the inner surface structure of the lower case.
As can be seen from FIGS. 2 and 3, the movable iron piece 7 is formed such that the width of the tip side portion 72 a of the horizontal arm 72 is wider than the width of the shaft portion side portion 72 b. Tip portion 72a and shaft portion 72
The boundary with b is near the right end position of the center leg 61c of the fixed iron core 61. As can be seen from a comparison with the conventional movable iron piece 7 shown in FIG. 5, the shaft side portion 72b has the same constant width as the conventional one. Thus, the width of the distal end portion 72a is set to a constant width which is wider than the conventional one. However, the width of the distal end portion 72a is limited
It is formed narrower than the width between the two. Otherwise,
The movable iron piece 7 has the same shape as the conventional one.

As can be seen from FIG. 1, the lower case 12
Is formed such that a step 13 is provided on the bottom surface, and a position immediately below the groove 81a of the groove member 81 and a part 13a on the right side thereof are higher than a part 13b on the tip side of the horizontal arm 72. As can be seen from FIGS. 1 and 3, the inner surface of the lower case 12 in the front-rear direction (vertical direction in FIG. 3)
A projection (engaging portion) 14 having a predetermined shape is provided. The protrusions 14 are provided at four positions corresponding to protrusions 82 provided on the outer surface of the side plate 8 described later, protrude from the inner surface of the lower case 12 by a predetermined thickness, and have a lateral surface 14 a for receiving the side surface of the protrusion 82 and the protrusions 82. It has a bottom surface 14b for receiving the lower surface.

The difference of the spool structure from the conventional one is that the side plate 8
On the outer surface of the lower case 12, a projection (convex portion) 82 that engages with the projection 14 of the lower case 12, an upper surface of the upper edge portion 62b and a lower surface of the lower edge portion 62c are inclined, and a lower edge portion 62c of the lower edge portion 62c is inclined. That is, a holding plate 9 for holding the fixed iron core 61 is provided at a lower portion.

As can be seen from FIGS. 1 and 3, in this spool structure, the side plate 8 raised from the lower surface of the upper end brim 62b so as to sandwich both side surfaces of the movable iron piece 7 and the groove member as in the prior art. 81 are integrally formed with the spool 62, and the shaft 71 of the movable iron piece 7 is fitted into the groove 81 a of the groove member 81. A rectangular projection 82 is provided at a position approximately halfway between the heights of the groove members 81 and at the left end of the side plate 8 and the right end of the groove member 81.

As can be seen from FIG. 1, the upper surface of the upper collar 62b is formed in a slanted shape inclined downward from the cylindrical body 62a toward the left and right sides, and the lower surface of the lower collar 62c is It is formed in the shape of a slope inclined upward from the body 62a toward the left and right sides. As can be seen from FIGS. 1 and 3, a pair of parallel holding plates 9 that sandwich the fixed core 61 with a small gap therebetween in the front-rear direction (vertical direction in FIG. 3) of the fixed core 61 are formed by a lower end flange 62c. It is integrated at the bottom. The position of the fixed iron core 61 in the front-rear direction with respect to the spool 62 is regulated by the holding plate 9.

Therefore, the cylindrical body 62a of the spool 62
Is fitted to the central leg 61b of the fixed iron core 61 installed in the lower case 11 from above, and the yoke 61d of the fixed iron core 61 is sandwiched by the holding plate 9, so that the lower surface of the projection 82 provided on the spool 62 side is lower. Bottom 1 of protrusion 14 of case 12
4b, and the horizontal position of the projection 82 is regulated by the lateral surface 14a of the projection 14, so that the spool 62 is easily positioned in the lower case 12. Thereby, the variation in the arrangement accuracy of the spool 62 in the housing 1 is reduced.

Further, the lateral arm 72 of the movable iron piece 7 is wider at the tip end portion 72a than at the shaft portion 72b, which is the center of rotation, so that when the movable iron piece 7 rotates due to coil excitation. Kinetic energy is greater than before. Thereby, the horizontal arm 72 is stably sucked and abuts against the fixed iron core 61. At this time, the step 13 on the bottom surface of the lower case 12
Since the fixed core 61 also rotates around the position, the impact force when the movable iron piece 7 abuts on the fixed core 61 is reduced. In addition, since the upper surface of the upper flange 62b and the lower surface of the lower flange 62c of the spool 62 are inclined,
When the movable iron piece 7 and the fixed iron core 61 rotate, the movable iron piece 7 hardly hits the upper end flange 62b of the spool 62.

As a result, the contact state between the fixed contact 5 and the movable contact 32 associated with the rotation of the movable iron piece 7 is stabilized, and the contact performance is improved. In this embodiment, the movable iron piece 7
Is divided into a tip side portion 72a and a shaft portion 72b near the right end position of the center leg 61b of the fixed iron core 61,
Although the distal end portion 72a is wider than the shaft portion 72b, the boundary position between the two portions is not limited to this position, and may be, for example, near the left end position of the central leg 61b of the fixed iron core 61. Further, the width may be gradually increased from the boundary position with the shaft portion-side portion 72b toward the front end, without making the front end portion 72a a constant width.

In this embodiment, a projection (convex portion) 82 is provided on the spool 62 side, and a projection (engaging portion) 14 for engaging the projection 82 is provided in the lower case 12. The protrusion is provided at a position above the upper end line of the lower case 12, and the engaging portion that engages with the protrusion is provided on the inner surface of the upper case 11, thereby restricting the position of the spool 61 within the upper case 11. Is also good. Further, a concave portion is provided on the spool 62 side instead of the protrusion (convex portion), and the engaging portion with which the concave portion is engaged is formed by the lower case 12 or the upper case 1.
1 may be provided on the inner surface.

[0026]

As described above, according to the electromagnetic contactor of the present invention, the impact force when the movable iron piece abuts on the fixed iron core is reduced. The contact state is stable, and the contact performance is improved.

According to the second aspect of the present invention, in addition to this, the variation in the arrangement accuracy of the spool in the housing is reduced, and the contact / separation performance between the fixed contact and the movable contact is improved.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram showing an electromagnetic contactor corresponding to an embodiment of the present invention.

FIG. 2 is a perspective view showing a movable iron piece of the embodiment.

FIG. 3 is a plan view showing an attached state of a spool to a lower case in this embodiment.

FIG. 4 is a schematic configuration diagram showing a conventional electromagnetic contactor.

FIG. 5 is a perspective view showing a movable iron piece in a conventional electromagnetic contactor.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Housing 11 Upper case 12 Lower case 13 Step 13a Part just below the groove of the lower case bottom 13b Part to be the tip side of the horizontal arm of the lower case bottom 14 Projection (engagement part) 14a Side surface 14b Bottom surface 2 Insulating plate 3 Contact support 4 Return spring 5 Fixed contact 61 Fixed iron core 61a Left leg 61b Central leg 61c Right leg 61d Yoke 62 Spool 62a Cylindrical body 62b Upper brim 62c Lower brim 7 Movable iron piece 71 Shaft 72 Cross arm 72a Front end Part 72b Shaft part side part 73 Vertical arm 8 Side plate (member integrated on upper part of upper collar) 81 Groove member (member integrated on upper part of upper collar) 81d Groove 82 Projection (convex part) 9 Nipping Board

Continuation of the front page (72) Inventor Koetsu Takatani 1-1-1, Tanabe Nitta, Kawasaki-ku, Kawasaki City, Kanagawa Prefecture Inside Fuji Electric Co., Ltd. (72) Inventor Yuji Sato 1-1-1, Tanabe Nitta, Kawasaki-ku, Kawasaki City, Kawasaki Prefecture, Fuji Electric Co., Ltd.

Claims (2)

[Claims] 1. A housing comprising an upper case and a lower case, wherein a fixed contact is mounted in the upper case, and a contact support having a movable contact which comes in contact with and separates from the fixed contact is accommodated in the housing. In the lower case, an electromagnet composed of a fixed core, a spool attached to the fixed core and having flanges at upper and lower ends of a cylindrical body, and a coil wound on the spool is housed. A lateral arm extending laterally above the electromagnet in the case, a vertical arm extending upward from one end of the lateral arm and having a tip abutting on a contact support in the upper case, and fitted into a groove provided on the upper part of the spool. The movable iron piece, which is composed of a shaft part serving as a rotating shaft, is rotated about the shaft part fitted in the groove as a fulcrum, so that the contact support moves and the fixed contact and the movable contact come and go. In a magnetic contactor that A step is provided on the bottom of the case so that the part directly below the groove is higher than the part on the tip side of the horizontal arm, and the width of the side arm of the movable iron piece is formed so that the tip side is wider than the shaft part side. Characterized electromagnetic contactor. 2. A protrusion or a recess is provided outside a member integrated on an upper end of an upper end flange of a spool, and an engagement portion of at least one of inner surfaces of an upper case and a lower case is engaged with the protrusion or the recess. The electromagnetic contactor according to claim 1, further comprising a joining portion.