JP2000276989A - Electromagnetic contactor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a movable iron piece from bounding when the movable iron piece is closed if an excitation voltage of a coil varies to some extent. SOLUTION: An elastic cushion material 21 is interposed between a yoke 11B and a step part 7B. Flange parts 22A, 22C are provided on upper and lower ends, respectively, of a tube part 22B of a spool 22. A gap 13B is formed between a left-side inner wall of the tube part 22B and a middle leg 11C while the left side portions of the flange parts 22A, 22C are obliquely formed to provide slopes 13A, 13C, respectively. A projection part 22D is formed beneath the spool 22, and the projection part 22D is fittingly inserted between a pair of projection parts 7C formed on a lower case 7.

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 hinge-shaped movable iron piece for opening and closing a motor and the like.
In particular, it relates to an electromagnetic contactor having a long contact switching life.

[0002]

2. Description of the Related Art FIG. 5 is a partially broken side view showing the structure of a conventional electromagnetic contactor, in which the side walls of an upper case 1 and a lower case 7 are crushed to see the inside. Lower case 7
A fixed iron core 11 formed in an E-shape is accommodated in the inside. The fixed iron core 11 includes two legs 11A, 11D, a center leg 11C, and these three legs 11A, 11C, 11D.
And a yoke 11B that joins the lower ends of the two. York 1
1B is mounted on a step 7B formed on the right side of the bottom 7A of the lower case 7. The cylindrical portion 12B of the winding frame 12 is fitted into the central leg 11C, and flange portions 12A and 12C are provided at upper and lower ends of the cylindrical portion 12B. This reel 1
The coil 16 is wound around the second cylindrical portion 12B. The upper case 1 is connected to the upper part of the lower case 7, and the contact support 2 is placed on the insulating plate 6 fixed to the upper case 1 so as to be movable left and right.

Further, the movable iron piece 8 is connected to a shaft 9 serving as a fulcrum.
And two arms 8A and 8B extending in a V-shape.
The shaft portion 9 is arranged on the upper part of the leg 11D and is fitted in the groove of the bearing 10. The bearing 10 is provided at the right end of the collar portion 12A of the winding frame 12, and supports the shaft portion 9 so as to be freely rotatable. One arm 8B of the movable iron piece 8 is disposed in a space 20 between the insulating plate 6 and the fixed iron core 11. The other arm 8 </ b> A of the movable iron piece 8 extends into the upper case 1 and is in contact with the contact support 2. A movable contact 3A is attached to the contact support 2 via a contact spring 5, and the contact support 2
A return spring 4 is interposed between the upper case 1 and the upper case 1.
Further, a fixed contact 3B is arranged to face the left side of the movable contact 3A and is fixed to the upper case 1 side.

FIG. 5 shows a state in which the electromagnetic contactor is not excited. In FIG. 5, when the coil 16 is excited, the arm 8B of the movable iron piece 8 is attracted to the fixed iron core 11 and rotates counterclockwise. Therefore, the arm 8A also rotates counterclockwise to move the contact support 2 to the left. Move to the direction. As a result, the movable iron piece 8 is brought into the closed state where it is attracted to the fixed iron core 11, and at the same time, the movable contact 3A comes into contact with the fixed contact 3B to close the main circuit. The contact spring 5 constantly biases the movable contact 3A to the left to maintain good contact between the contacts. When the excitation of the coil 16 is stopped, the attracting force of the fixed iron core 11 disappears, so that the return spring 4 moves the contact support 2 to the right. Thereby, the movable iron piece 8 rotates clockwise and is released from the closed state, and the movable contact 3A and the fixed contact 3B are separated (in the case of the a contact). In addition, the movable iron piece 8
In some cases, the movable contact 3A and the fixed contact 3B are separated from each other by turning on, and the movable contact 3A and the fixed contact 3B are brought into contact by opening the movable iron piece 8 (in the case of the b contact).

[0005]

However, the conventional device as described above has a problem that when the movable iron piece is inserted,
There is a problem that the movable iron piece may bounce above the fixed iron core. That is, although the excitation voltage of the coil fluctuates slightly, when a high voltage is applied to the coil, the movable iron piece may obtain high energy and may vigorously collide with the fixed iron core. Thereby, the movable iron piece bounces on the upper part of the fixed core, and the movable contact and the fixed contact to be closed are closed after repeated contact and separation. As a result, the contacts may be significantly damaged and their switching life may be shortened. An object of the present invention is to prevent the movable iron piece from bouncing when the movable iron piece is inserted, even if the excitation voltage of the coil slightly fluctuates.

[0006]

According to the present invention, a coil is inserted into a central leg of an E-shaped fixed core supported by a lower case, and both sides of the fixed core are provided. In an electromagnetic contactor operating a movable contact support slidably supported by an upper case with a hinge-shaped movable iron piece having a bearing at a bearing on an upper part of one leg as a fulcrum, a fixed core is a fulcrum of the movable core. It is preferable that the lower case cantilever the lower case via a cushion material. As a result, the impact energy of the movable iron piece hitting the fixed iron core is absorbed, and the movable iron piece does not bounce above the fixed iron core when the movable iron piece is inserted. Therefore, the movable contact and the fixed contact to be closed do not repeat contact and separation.

In this configuration, the cushion member may be interposed between a step provided in the lower case and an end of the fixed iron core. Further, in such a configuration, the cushion material is constituted by a thin portion and a thick portion, and the thin portion is between the upper side of the step portion and the fixed iron core, and the thick portion is the lower portion of the step portion. You may make it interpose between a fixed iron core. Since the left and right thicknesses of the cushioning material are configured to change, the left and right spring constants of the cushioning material can be selected to a value suitable for the size of the movable iron piece and the magnitude of the excitation voltage of the coil. Impact energy to the iron core can be absorbed more reliably.

In this configuration, an engagement portion may be formed at a lower portion of the winding frame of the coil, and an engagement portion that can be fitted to the engagement portion may be formed at a bottom of the lower case. . Thereby, the engagement portion determines the position of the bobbin accommodated in the lower case and fixes the bobbin.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to embodiments. FIG. 1 is a partially broken side view showing a configuration of an electromagnetic contactor according to an embodiment of the present invention. Yoke 11B
A cushion material 21 having elasticity is interposed between and the step portion 7B. Further, collar portions 22A and 22C are provided at upper and lower ends of a cylindrical portion 22B of the winding frame 22. Tube part 2
A gap 13B is provided between the left inner wall of 2B and the center leg 11C.
Are formed, and the left sides of the flange portions 22A and 22C are formed obliquely, and provided with inclined surfaces 13A and 13C, respectively. Further, a protrusion 22 is provided at a lower portion of the winding frame 22.
D is formed, and a protrusion 22D is fitted between a pair of protrusions 7C formed on the lower case 7. The rest of FIG. 1 is the same as the conventional configuration of FIG. When the movable iron piece 8 is inserted, the fixed iron core 11 slightly tilts counterclockwise. However, the gap 13B, the wedge-shaped gap between the movable iron piece 8 formed by the inclined surface 13A and the collar 22A, Yoke 1 formed by surface 13C
The inclination of the fixed iron core 11 is absorbed by the wedge-shaped gap between 1B and the collar portion 22C.

FIG. 2 is an exploded perspective view of the main part of the crusher of FIG. The upper and lower walls of the lower case 7 are partially crushed, and only the bobbin 22 is shown inside the lower case 7. The cushion member 21 is fitted into a fitting hole 7E formed between the cushion stopper 7D protruding from the bottom 7A of the lower case 7 and the stepped portion 7B. Also,
A pair of protrusions 7C are formed on both side surfaces of the lower case 7,
The winding frame 22 is inserted into the recess 7F formed between the pair of protrusions 7C.
Is fitted. That is,
The convex portion 22D and the concave portion 7F form an engaging portion that fits each other.

In FIG. 2, the engaging portion between the convex portion 22D and the concave portion 7F is used for positioning the winding frame 22 in the lower case, and the winding frame 22 is also fixed. Thereby,
The work of assembling the device becomes easier and the assembling time is reduced.

FIG. 3A is a sectional view taken along the line XX of FIG. 2, and FIG. 3B is a perspective view showing the structure of the cushion material 21 of FIG. 3A. In FIG. 3A, the cushion material 21 is fitted in the fitting hole 7E. Further, in FIG. 3B, the cushion member 21 includes a thin portion 21B and a thick portion 21A. This thick part 21A
Are fitted in the fitting holes 7E as shown in FIG.

In FIG. 3A, the cushion 21
May be only the thin portion 21B. However, by configuring the cushion material 21 so that the left and right thicknesses are changed, the spring constant can be selected to a value suitable for the size of the movable iron piece and the excitation voltage of the coil. Impact energy can be more reliably absorbed. Thereby, the reliability of the electromagnetic contactor is further improved.

FIG. 4 is a perspective view showing the structure of a cushion member of an electromagnetic contactor according to another embodiment of the present invention.
(A) and (B) are diagrams of different embodiments.
In FIG. 4A, the cushion member 23 is composed of a thin portion 23B and a thick portion 23A, and the thin portion 23B is a thin portion 2 of FIG.
1B, but the thick portion 23A is formed in the shape of a clog. 3B, the cushion member 24 is composed of a thin portion 24B and a thick portion 24A, and the thick portion 24A is the same as the thick portion 21A of FIG. 3, but the thin portion 24B is shaped like a clog. Is formed. That is, the cushioning material is
Generally, it suffices if it is composed of a thin portion and a thick portion having different thicknesses, and the shape is arbitrary.

[0015]

As described above, according to the present invention, the fixed iron core is cantilevered to the lower case via the cushion material, so that the contact switching life is extended. Further, in such a configuration, the cushion member is constituted by a thin portion and a thick portion, and the thin portion is between the upper side of the step portion and the yoke, respectively, and the thick portion is the lower side of the step portion and the yoke. The reliability of the device is further improved by being interposed therebetween.

In this configuration, a convex portion is formed at the lower portion of the bobbin, and a concave portion that can be fitted to the convex portion is formed at the bottom of the lower case. Time is reduced.

[Brief description of the drawings]

FIG. 1 is a partially broken side view showing the configuration of an electromagnetic contactor according to an embodiment of the present invention.

FIG. 2 is an exploded perspective view of a main part of the crusher of FIG.

3A is a cross-sectional view taken along line XX of FIG. 2, and FIG. 3B is a perspective view showing a configuration of the cushioning material of FIG. 3A.

FIG. 4 is a perspective view showing a configuration of a cushion material of an electromagnetic contactor according to a different embodiment of the present invention, wherein (A) and (B) are diagrams of different embodiments.

FIG. 5 is a partially crushed side view showing the configuration of a conventional electromagnetic contactor.

[Explanation of symbols]

1: upper case, 2: contact support, 3A: movable contact, 3
B: fixed contact, 4: return spring, 5: contact spring, 6: insulating plate, 7: lower case, 7A: bottom, 7B: step, 7
F: concave portion, 8: movable iron piece, 8A, 8B: arm, 9: shaft portion,
10: Bearing, 11: Fixed iron core, 11A, 11D: Both legs, 11C: Central leg, 11B: Yoke, 22: Reel, 2
2A, 22C: collar, 22B: tubular, 22D: convex
16: coil, 21, 23, 24: cushion material, 21
A, 23A, 24A: thick part, 21B, 23B, 24
B: Thin part

Claims (4)

[Claims] 1. A hinge-shaped movable iron piece having a coil inserted into a central leg of an E-shaped fixed core supported by a lower case and having a bearing at a bearing on an upper part of one leg of both sides of the fixed core. In an electromagnetic contactor operating a movable contactor support slidably supported by an upper case, a fixed core is cantilevered to a lower case via a cushion material at an end on a side serving as a fulcrum of the movable core. Characterized electromagnetic contactor. 2. The electromagnetic contactor according to claim 1, wherein said cushion member is interposed between a step provided in a lower case and an end of a fixed core. 3. The electromagnetic contactor according to claim 2, wherein the cushion member is constituted by a thin portion and a thick portion, and each of the thin portions is provided between an upper side of a step portion and a fixed iron core. An electromagnetic contactor characterized in that a thick portion is interposed between a lower side of a step portion and a fixed iron core. 4. The electromagnetic contactor according to claim 1, wherein an engaging portion is formed at a lower portion of the winding frame of the coil, and an engaging portion that can be fitted to the engaging portion is formed at a bottom portion of the lower case. An electromagnetic contactor characterized by being made.