KR20110041542A - Electromagnetic contactor - Google Patents

Abstract

Vacuum valve (1) with fixed contact (1a) and movable contact (1b), insulating frame (2) for holding and holding vacuum valve (1), and insulating rod (6) connected to movable contact (1b) side And an opening / closing lever 10 and an opening / closing lever 10 for reciprocating the main circuit section 8 having the contact spring 7 and the insulating rod 6 in the fold direction of both contacts. Drive mechanism 17 having a rotating shaft 11 provided on the side, a movable member 12 fixed to the rotating shaft 11, and an electromagnetic magnet 13 for sucking the movable member 12 to rotate the rotating shaft 11. And the magnetic contactor having the base 9, the main circuit part 8 is fixed to the base 9 via the insulating frame 2, and the driving mechanism part 17 does not pass through the insulating frame 2. It fixed to the base 9 and comprised.

Description

Magnetic contactor {ELECTROMAGNETIC CONTACTOR}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic contactor that performs opening and closing control of a power device such as a step-down motor or a power factor correction capacitor, and more particularly, a drive for opening and closing the main contact. It is about a mechanism part.

As a conventional magnetic contactor (switch), a switch as shown in Fig. 6 is known, for example. Fig. 6A is a front view and Fig. 6B is a side sectional view. As shown in Fig. 6A, three vacuum valves 32 for three phases are stored in the insulating frame 31, and are not shown in the vacuum valve 32. The fixed rod 33 and the movable rod 34 are pulled out from the contact. The movable rod 34 is equipped with a contact spring 36 via an insulating rod 35. As shown in FIG. 6B, an opening and closing lever 38 having one end fixed to the rotation shaft 37 is disposed below the contact spring 36. The rotating shaft 37 is rotatably supported by the bearing 39 on both side walls of the insulating frame 31. In addition, the movable iron piece 40 is fixed to the rotation shaft 37. This movable iron piece 40 is attracted by the suction force of the electromagnetic magnet 41 which consists of an iron core and a coil, and is pressurized in the opposite direction by the open spring 42 (refer FIG.6 (a)). .

The suction force of the electromagnetic magnet 41 and the opening force of the opening spring 42 are transmitted to the opening / closing lever 38, the insulating rod 35, and the movable rod 34 through the rotation shaft 37 to provide the vacuum valve 32. The ON / OFF operation of the main contact is performed. By energizing the coil of the electromagnetic magnet 41 and generating an electromagnetic force, the movable iron piece 40 is attracted to maintain the input state of the main contact, and when the current is interrupted, the electromagnetic force is lost, so that the open spring 42 is opened. The main contact is cut off by the force (see Patent Document 1).

Patent Document 1: Japanese Patent Application Laid-Open No. 11-67022 (Second page, Fig. 7, 8)

In the magnetic contactor, if a gap occurs in the contact portion between the yoke constituting the magnet and the movable iron piece, the electromagnetic force is greatly reduced. The size of the gap is determined by the accumulation of tolerances of the components interposed between the yoke and the movable iron piece. In the switchgear of patent document 1, many component parts, such as a yoke-base-insulation frame-bearing-rotating shaft-movable iron piece, are interposed between the yoke and the movable iron piece. In addition, since the insulating frame is made of, for example, a mold insulator, the dimensional accuracy is inferior to that of the metal product. For this reason, in order to secure the required electromagnetic force, there existed a problem that it was necessary to perform delicate dimensional adjustment between a movable iron piece and a yoke, or generate a large electromagnetic force using a large coil.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and it is possible to easily adjust the configuration between the yoke and the mover by improving the configuration of the interposed parts between the yoke and the mover (movable iron piece) without increasing the size of the coil. An object of the present invention is to obtain a magnetic contactor.

The magnetic contactor according to the present invention is operated by being equipped with a vacuum valve having a fixed contact and a movable contact, an insulating frame for accommodating and holding the vacuum valve, and a contact spring for providing a contact pressure between both contacts. A main circuit portion having an insulating rod connected to the contact side, an opening / closing lever for reciprocating the insulating rod in the folding direction of both contacts through a contact spring, a rotating shaft provided at a point of the opening / closing lever, A drive mechanism portion having a movable shaft fixed to the rotating shaft and interlocked with the open / close lever, an electromagnetic magnet disposed opposite the movable member to attract the mover to rotate the rotating shaft, and a base for fixing the main circuit portion and the driving mechanism portion. In the magnetic contactor provided, the main circuit part is fixed to the base through an insulating frame, and the driving mechanism part is fixed to the base without passing through the insulating frame. Will.

According to the electromagnetic contactor of the present invention, the main circuit portion is fixed to the base via an insulating frame, and the driving mechanism portion is fixed to the base without passing through the insulating frame, thereby providing a yoke between the yoke and the mover constituting the electromagnetic magnet of the driving mechanism portion. Since the intervening parts can be reduced in assembly, and the insulating frame which is difficult to give dimensional accuracy is not interposed, it can be assembled with high precision and the clearance gap between a yoke and a mover is reduced. Therefore, the electromagnetic force required for the input of the contact can be stably obtained without enlarging the coil.

Moreover, at the time of assembly, it becomes possible to assemble a main circuit part and a drive mechanism part separately, and the dimension adjustment and assembly work become easy.

1 is a front view showing a magnetic contactor according to Embodiment 1 of the present invention.
FIG. 2 is a side sectional view seen from arrow II-II of FIG. 1. FIG.
3 is a partial side cross-sectional view of the main part seen from arrow III-III of FIG. 1.
Fig. 4 is a partial view showing the electromagnetic magnet portion of Fig. 1, (a) is a perspective view, and (b) is a sectional view of the bearing support portion thereof.
5 is a perspective view showing an electromagnetic magnet portion of the magnetic contactor according to Embodiment 2 of the present invention.
6 is a view showing a conventional magnetic contactor (switching and closing), (a) is a front view, (b) is a side cross-sectional view.

Embodiment 1

EMBODIMENT OF THE INVENTION Hereinafter, the magnetic contactor which concerns on Embodiment 1 of this invention is demonstrated based on drawing.

First, the overall configuration of the magnetic contactor will be described with reference to FIGS. 1 and 2. The vacuum valve 1 in which the fixed contact 1a and the movable contact 1b are incorporated is housed in three phases inside the insulating frame 2. The fixed contact 1a is connected to the fixed rod 1c, and the fixed rod 1c is led out of the container of the vacuum valve 1 to be connected to the fixed side terminal 3 and fixed to the insulating frame 2. It is.

On the other hand, the movable contact 1b is connected to the movable rod 1d which is movable in the folding direction of the contact. The movable rod 1d is led to the outside via the flexible conductor 4 and connected to the movable side terminal 5, and on one side of the insulating rod 6 coaxial with the movable rod 1d. It is connected. On the other side of the insulating rod 6, a contact spring 7 is provided which gives a contact pressure between both contacts.

Main parts of the above-mentioned vacuum valve (1), insulating frame (2), fixed side terminal (3), flexible conductor (4), movable side terminal (5), insulating rod (6), contact spring (7) The circuit part 8 (refer FIG. 1) is comprised. The main circuit portion 8 is bolted to and fixed to the base 9 via the insulating frame 2.

In addition, the material of the base 9 is a metal plate, for example, is formed by pressing a steel plate.

In addition, the shape of each component of the main circuit part 8 has shown the example, and is not limited to the shape of drawing.

The front end side of the insulating rod 6 is connected to one end of the opening / closing lever 10 via the contact spring 7. The other end of the opening / closing lever 10 is fixed to the rotation shaft 11, and is rotated by pivoting the shaft center of the rotation shaft 11 to a point, and is connected to the insulating rod 6 through the contact spring 7 and to it. The movable rod 1d is reciprocated in the folding direction of both the contacts 1a and 1b.

Further, the movable shaft 12 is fixed to the rotating shaft 11 so as to rotate in conjunction with the opening / closing lever 10. Then, an electromagnetic magnet 13 for sucking the movable element 12 by the electromagnetic force and rotating the rotating shaft 11 in the direction in which the contact is inputted is disposed on the base 9 facing the movable element 12. have. The detail of this electromagnetic magnet 13 and the structure of the support part of the rotating shaft 11 are mentioned later.

In addition, the base 9 is provided with a stopper 14 having an L-shaped cross section in order to restrict the movement in the direction opposite to the suction direction of the movable element 12.

The rotation shaft 11 is provided with a lever 15 (see FIG. 1) for opening a contact separately from the opening / closing lever 10 for driving the insulating rod 6 described above, and is opposed to the lever 15. An open spring 16 is provided. Details of this portion will be described with reference to FIG. 3. 3 is a cross-sectional view taken from III-III of FIG. 1.

One end of the lever 15 is fixed to the rotational shaft 11 by a bolt or the like, and the other end is opened by the open spring 16 so that the open spring 16 is pressed in the direction opposite to the suction direction of the mover 12. ) Is arranged. The side opposite to the lever 15 side of the open spring 16 is supported and fixed to the base 9. Even if the lever 15 is pressed against the open spring 16 and the rotating shaft 11 rotates, the above-described angle does not rotate by the action of the stopper 14 described above.

Drive mechanism for driving the contact portion of the opening and closing lever 10, the rotating shaft 11, the mover 12, the electromagnetic magnet 13, the stopper 14, the lever 15, the open spring (16) 17 (refer FIG. 1) is comprised. The drive mechanism 17 is fixed directly to the base 9 side without passing through the insulating frame 2.

In addition, the shape of each component of the drive mechanism part 17 is not limited to drawing. For example, the lever 15 may be used in combination with the mover 12.

Next, the detail of the assembly structure of the electromagnetic magnet 13 and the rotating shaft 11 is demonstrated with the sectional drawing of FIG. 2, and the perspective view of FIG.

As shown in the cross-sectional view of FIG. 2, the iron core 18 is located at the center of the electromagnetic magnet 13, and the electromagnetic coil 19 is wound around the iron core 18. The yoke 20 is disposed so as to surround the three directions of the electromagnetic coil 19, and the yoke 20 and the iron core 18 are integrally fixed by bolts. A mounting leg 20a is provided on the lower side of the yoke 20 and is fixed to the base 9 by bolting or the like.

The bearing support part 20b for supporting the rotating shaft 11 is provided in the upper part of the groove-shaped yoke 20 opening side, and the circular bearing mounting hole 20c is formed in the bearing support part 20b. . 4B is a cross-sectional view of the vicinity of the bearing support 20b of (a). As shown in the drawing, the bearing 21 is inserted into the bearing mounting hole 20c, and the cross section is inserted into the bearing 21. The square rotating shaft 11 is inserted and supported so that rotation is possible.

When the movable element 12 is attached to the rotation shaft 11 so as to face the electromagnetic magnet 13, and the electromagnetic magnet 13 is operated to attract the movable element 12, the face of the movable element 12 The surface of the yoke 20 is in contact with the surface of the opening side with almost no gap.

The opening / closing lever 10 described above is fixed to the mounting hole 11a on the upper surface side of the rotation shaft 11 by bolting or the like. Moreover, the lever 15 mentioned above is attached to the mounting hole 11b of the side surface.

In addition, the rotational shaft 11 is positioned so that the rotational shaft 11 does not shift in the axial direction by using the mounting portion of the movable element 12 over approximately the entire length of the bearings 21 of the rotational shaft 11.

In addition, the cross-sectional shape of the rotational shaft 11 is made into a rectangle because the movable element 12, the opening / closing lever 10, and the lever 15 are easy to fix, but it is not necessarily limited to the square.

The operation of the magnetic contactor configured as described above will be described.

When the contact of the vacuum valve 1 is open, the yoke 20 and the mover 12 of the electromagnetic magnet 13 are in the same state as FIG. When the input instruction is issued to the magnetic contactor, the electromagnetic coil 19 is excited, and a magnetic flux that turns the iron core 18, the yoke 20, and the mover 12 is generated to generate an electromagnetic magnet ( 13) suction force is generated. By this suction force, the movable element 12 is attracted to the yoke 20 and rotates clockwise in FIG. 3 with the rotational shaft 11 as a point. In conjunction with this, the open / close lever 10 pushes the insulating rod 6 and the movable rod 1d through the contact spring 7 so that the movable contact 1b of the vacuum valve 1 abuts on the fixed contact 1a. All. In addition, the contact spring 7 is compressed to a state as shown in FIG. Both contact 1a, 1b is added with the contact pressure required for a contact by the contact pressure of the contact spring 7. As shown in FIG. The input state is maintained by continuously flowing a current through the electromagnetic coil 19. In order to maintain the closing state, the suction force of the electromagnetic magnet 13 is designed to exceed the sum of the contact pressure of the contact spring 7 and the open force of the open spring 16.

When the excitation is released by blocking the current of the electromagnetic coil 19, the suction force of the electromagnetic magnet 13 is lost, the force of the contact spring 7 and the force of the open spring 16 to press the lever 15 by the force The rotating shaft 11 rotates counterclockwise in FIG. 2, and the opening / closing lever 10 is pushed down, and the movable contact 1b is separated from the stationary contact 1a to be in a blocking state. At this time, as shown in FIG. 3, the movable element 12 is in contact with the stopper 14 so as not to rotate further.

Next, the effect | action of the electromagnetic magnet 13 and the rotating shaft 11 which employ | adopted the structure similar to FIG. 4 which is the characteristic part of this embodiment is demonstrated.

In general, the attraction force of the electromagnetic magnet is greatly reduced when a gap occurs in the contact portion between the yoke (or iron core) and the mover constituting the electromagnetic magnet. Therefore, it is necessary to combine the mover and the magnet so that the gap is minimal. The size of the clearance is determined by the accumulation of the tolerances of the intervening parts in the mechanical joints of the assembly between the yoke and the movable iron piece.

In this embodiment, as shown in FIG. 4, the rotation shaft 11 is rotatably supported by the bearing 21 by the bearing support part 20b formed by protruding a part of the member which comprises the yoke 20. As shown in FIG. . By such a configuration, the yoke 20 and the mover 12 are combined into four parts by the yoke 20-the bearing 21-the rotating shaft 11-the mover 12, and the background art Compared with the switch of the prior art document 1 described above, it can be seen that the intervening parts are decreasing. In addition, there is no intervening insulating frame 2 between the yoke 20 and the movable element 12 that is difficult to obtain dimensional accuracy. Since the insulating frame 2 is comprised from the insulator of a mold, for example, dimensional accuracy is inferior to a metal product.

For this reason, the deviation of the clearance between the movable element 12 and the yoke 20 (or iron core 18) at the time of assembly is reduced, and adjustment is simplified because it does not require adjustment, such as fine adjustment, and it is accurate. It is possible to assemble the mover 12. Therefore, the gap can be reduced to a minimum, and as a result, the electronic magnet 13 can be miniaturized.

In addition, since there are few intervening parts in the middle, the gap dimension is prevented from changing due to deterioration, wear, or the like, and a magnetic contactor with stable quality can be provided.

In addition, the main circuit portion 8 includes a driving mechanism portion 17 composed of an electromagnetic magnet 13 portion, a bearing 21, a rotation shaft 11, an open / close lever 10, a lever 15, and an open spring 16. Since the main circuit unit 8 and the drive mechanism unit 17 can be separately assembled, they can be fixed separately and directly to the base 9 without passing through the insulating frame 2 on the side. This facilitates assembly.

As described above, according to the electromagnetic contactor of the first embodiment, the main circuit portion having the vacuum valve, the insulating frame and the insulating rod, the drive mechanism portion having the open / close lever, the rotating shaft, the mover, the magnet, the main circuit portion and the drive mechanism portion In a magnetic contactor having a fixed base, the main circuit portion is fixed to the base via an insulating frame, and the drive mechanism portion is fixed to the base without passing through the insulating frame, so that the yoke and the mover constitute the electromagnetic magnet of the drive mechanism portion. Since the intervening parts can be reduced in the assembly between them, and since there is no intervening insulating frame which is difficult to achieve dimensional accuracy, the assembly can be performed with high accuracy, and the gap between the yoke and the mover is reduced. Therefore, the electromagnetic force required for the input of the contact can be stably obtained without enlarging the coil.

In addition, during assembly, it is possible to assemble the main circuit portion and the drive mechanism portion separately, thereby facilitating the adjustment and assembly work.

In addition, the rotating shaft of the drive mechanism is rotatably supported by the bearing support provided in the yoke constituting the electromagnetic magnet through the bearing, so that the yoke and the mover are combined with the yoke-bearing-rotating shaft-operator and four parts. The intervening parts in the middle are reduced, and the above effects can be sufficiently exhibited.

Embodiment 2 Fig.

FIG. 5 is a perspective view showing an electromagnetic magnet portion of the magnetic contactor according to the second embodiment, which corresponds to FIG. 4 of the first embodiment. Equivalent parts are given the same reference numerals and detailed description thereof will be omitted. The entire view of the magnetic contactor is the same as that of Figs. 1 to 3 of Embodiment 1, and the description of the opening and closing operations of the magnetic contactor is omitted.

As shown in FIG. 5, the electromagnetic magnet 22 of this embodiment is the same as the iron core 18 (same as the iron core 18 of FIG. 2) inside the electromagnetic coil 19 and the electromagnetic coil 19, It consists of the yoke 23 arrange | positioned so that the three directions of the outer side of the coil 19 may be enclosed, and the yoke 23 and the iron core 18 are fixed by the bolt etc. The yoke 23 is fixed to the base 9.

The difference from Embodiment 1 is that the rotating shaft 11 is supported by the bearing support member 24 arrange | positioned at the both sides of the yoke 23. As shown in FIG. The bearing support member 24 is formed by bending a steel plate, for example, and the mounting leg 24a is fixed to the base 9 by bolts or the like. The bearing 21 is inserted into the bearing support hole (not shown) formed in the upper side, and the pivot shaft 11 is inserted into the bearing 21 to be rotatably supported.

When the movable element 12 is attached to the rotation shaft 11 so as to face the electromagnetic magnet 22, and the electromagnetic magnet 22 is operated to suck the movable element 12, the face of the movable element 12 The surface of the yoke 23 abuts against the opening side.

The operation of the electromagnetic magnet 22, the rotation shaft 11, and the mover 12 configured as described above will be described.

Although the base 9, the bearing support member 24, the bearing 21, and the rotation shaft 11 are interposed between the yoke 23 and the mover 12, the number of parts to be interposed increases from the first embodiment. In the same manner as in the first embodiment, the insulating frame 2 which is difficult to give dimensional accuracy is not interposed between the yoke 23 and the movable element 12. For this reason, the gap of the clearance between the movable element 12 and the yoke 23 (or iron core) becomes small at the time of assembly, and the adjustment work of clearance is simplified and it is possible to assemble the movable element 12 with high precision. do.

Moreover, the drive mechanism part 17 which consists of an electromagnetic magnet 22 part, the bearing support member 24, the bearing 21, the rotating shaft 11, the opening / closing lever 10, the lever 15, and the open spring 16. 1 is mounted on the base 9 side, and can be assembled separately from the main circuit section 8 including the vacuum valve 1 housed on the insulating frame 2 side. Assembly adjustment is possible at.

As described above, according to the electromagnetic contactor according to the second embodiment, since the rotation shafts of the drive mechanism are supported on the bearing support members fixed to the base and disposed on both sides of the electromagnetic magnet so as to be rotatable through the bearing, Since there is no intervening insulating frame, which is difficult to achieve dimensional accuracy, the gap between the mover and the yoke is reduced, the gap adjustment operation is simplified, and the mover can be assembled with high precision.

In addition, during assembly, it is possible to assemble the main circuit portion and the drive mechanism portion separately, thereby facilitating the adjustment and assembly work.

Claims (3)

A vacuum bulb having a fixed contact and a movable contact, an insulating frame for accommodating and maintaining the vacuum valve, and a contact spring for providing a contact pressure between the two contacts are mounted on the movable contact side. A main circuit portion having an insulated rod connected to the
An opening / closing lever for reciprocating the insulating rod in the fold direction of both the contact points through the contact spring, a rotating shaft provided at a point side of the opening / closing lever, and fixed to the rotating shaft to open and close A drive mechanism portion having a mover that rotates in conjunction with a lever, and an electromagnetic magnet disposed to face the mover and attracting the mover to rotate the rotation shaft;
In the magnetic contactor having a base for fixing the main circuit portion and the drive mechanism portion,
And the main circuit part is fixed to the base through the insulating frame, and the driving mechanism part is fixed to the base without passing through the insulating frame. The method according to claim 1,
And said rotating shaft of said drive mechanism portion is rotatably supported by a bearing support portion provided in a yoke constituting said electromagnetic magnet through a bearing. The method according to claim 1,
And the rotation shafts of the drive mechanism are rotatably supported by bearings on bearing support members fixed to the base and disposed on both sides of the electromagnetic magnet.

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