KR20120079165A - Electromagnetic contactor - Google Patents

Abstract

A vacuum valve incorporating the electromagnetic magnet 13, the movable element 12 driven by the excitation of the electromagnetic magnet 13, and a pair of main contacts driven and folded in conjunction with the driving of the movable element 12 ( In the magnetic contactor provided with 1), the electromagnetic magnet 13 is inserted into the bobbin 17 wound around the bobbin 17 having the collar portion 17a at both ends, and inserted into the bobbin 17 to move to one end side. An iron core 19 having a magnetic pole head 19a facing the ruler 12 and a yoke 20 fixed to an outer end side of the iron core 19 to surround the side of the electromagnetic coil 18, the magnetic pole head ( The vehicle plate 22 was provided on the collar 17a of the bobbin 17 on the 19a side so as to cover the magnetic pole head 19a.

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, to a main contact. , ON / OFF).

The magnetic contactor is inserted and blocked by the main contact point using the suction force of the electromagnetic magnet. As a conventional magnetic contactor, what is shown, for example in FIG. 5 is known. The iron core 31, the electromagnetic magnet 34 which consists of the coil 32 and the yoke 33 wound around the iron core 31, is provided, and when the coil 32 is excited, a movable iron plate ( 35 is aspirated, the rotating shaft 36 on which the movable steel plate is mounted rotates, and in conjunction with this, the support plate 37 rotates upwards, and the operating rod of the vacuum valve 38 connected to the support plate moves upward. The main contact built into the vacuum valve 38 is introduced. When the excitation of the coil 32 is released, the main contact is opened by rotating the rotation shaft 36 counterclockwise by a spring member (not shown).

In the gap between the iron core 31 portion of the electromagnetic magnet 34 and the movable iron plate 35, a vehicle plate 39 is provided. The magnetic shield plate 39 is intended to reduce the cross-sectional area of the magnetic path to prevent malfunction due to residual magnetism, and serves substantially as a void. In the case of FIG. 5, the vehicle plate 39 made of a flexible member is fitted to the washer and bolted to the iron core 31 (see Patent Document 1).

Patent Document 1: Japanese Patent Application Laid-Open No. 61-151305 (pages 2-4, FIG. 1)

The attraction force of the electromagnetic magnet is largely changed by the gap of the contact portion between the movable element (movable steel plate) and the yoke (or iron core). The mover and the yoke (or iron core) collide each time the main contact becomes ON and the contact state changes with the number of collisions. Therefore, the suction force changes greatly with the opening and closing times of the electromagnetic magnet. For this reason, when the vehicle board is inserted into the gap, it is firmly mounted without being loosened, and there is little dimensional change due to the impact during opening and closing, and it is easy when the vehicle board is worn or deteriorated by repeated collisions. It is desirable to be able to replace it.

In the magnetic contactor using the electromagnetic magnet shown in Patent Document 1, since the magnetic shield plate is fixed to the iron core by bolts, there is a problem that the bolts may loosen and fall off due to repeated shocks. In addition, when replacing, it is necessary to remove the bolts and replace them, which causes a problem that the replacement is troublesome. Moreover, since the washer part used as a magnetic pole head is exposed, there existed a problem that a foreign material and dust were easy to adhere.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to provide an electromagnetic contactor which is strong against repeated shocks, is hard to attach foreign matter and dust to the magnetic pole portion, and has an easy-to-mount car panel. do.

The magnetic contactor according to the present invention includes an electromagnetic magnet, a mover driven by an excitation of the magnet and a vacuum valve incorporating a pair of main contacts driven and foldable in conjunction with driving of the mover. In one electromagnetic contactor, an electromagnetic magnet includes an iron coil wound around a bobbin, an iron core having a magnetic pole head inserted into the bobbin and opposed to the mover at one end thereof, and the other end side and the electromagnetic coil of the iron core. It is formed in a 'co' shape so as to surround both sides of the yoke, and has a yoke for contacting the mover at the cross section of the opening side, and has a shape almost the same as that of the pole head, and is fixed to the pole head so that the main contact point is closed. It is equipped with a permanent magnet to hold.

According to the electromagnetic contactor of the present invention, an electromagnetic magnet for driving a main contact includes: an iron coil wound around a bobbin, an iron core having a bobbin head inserted into the bobbin and opposed to a mover at one end thereof, the other end side of the iron core, and It is formed in a 'co' shape so as to surround both sides of the electromagnetic coil, and has a yoke for contacting the mover at the cross section of the opening side, and has a shape almost the same as that of the magnetic pole head, and is fixed to the magnetic pole head to insert the main contact point. Since the permanent magnet is provided to maintain the state, the movable element is brought into contact with the end face of the opening side of the yoke, making it difficult to cause abnormalities in the parallelism with the magnetic pole head even in long-term use, resulting in highly reliable electrons. Contactors can be provided.

In addition, by maintaining the input state of the main contact with the permanent magnet provided in the magnetic pole head, it is possible to provide a highly reliable magnetic contactor without requiring a special latch for the input holding.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows the structure of the electromagnetic contactor by Embodiment 1 of this invention, (a) is a side side cross section, (b) is a partial front view of the electromagnetic magnet part seen from the arrow b of (a).
FIG. 2 is a perspective view of the electromagnetic magnet part of FIG. 1. FIG.
3 is a perspective view illustrating a mounting method of a vehicle board of an electronic coil of the electronic magnet of FIG. 1.
4 is a diagram showing the relationship between the gap between the mover and the magnetic pole head and the electromagnetic force.
5 is a view showing the configuration of a conventional magnetic contactor.

Embodiment 1

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

First, the whole structure will be described based on FIG. The three-phase vacuum valve 1 with the main contact which consists of the fixed contact 1a and the movable contact 1b is accommodated inside the insulating frame 2. As shown in FIG. 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. The other side of the insulating rod 6 is connected to one end of the open / close lever 8 via a contact spring 7 which provides a contact pressure between both contacts.

The other end of the opening / closing lever 8 is fixed to the rotation shaft 9, and by rotating the shaft center of the rotation shaft 9 to a point, the insulating rod 6 and the movable connected thereto through the contact spring 7 are rotated. The rod 1d is reciprocated in the folding direction of both the contacts 1a and 1b. As shown in FIG.1 (b), this rotating shaft 9 is rotatably supported by the bearing 11 at both side surfaces of the insulating frame 2 fixed to the base 10. As shown in FIG.

In addition, the movable shaft 12 is fixed to the rotating shaft 9 by the movable member 12 which rotates in association with the opening / closing lever 8. Then, an electromagnetic magnet 13 for sucking the movable element 12 by the electromagnetic force and rotating the rotating shaft 9 in the direction in which the contact is put is disposed on the base 10 opposite to the movable element 12. . The details of the vicinity of the contact portion between the electromagnetic magnet 13 and the electromagnetic magnet 13 and the mover 12 will be described later.

In addition, as shown in FIG.1 (b), the lever 14 for contact opening is provided in the rotating shaft 9, and the opening spring 15 is arrange | positioned facing the lever 14. As shown in FIG. The opening spring 15 is pressed in a direction opposite to the suction direction of the mover 12. The opening spring 15 is operated by pressing the lever 14 to rotate the pivot shaft 9 to open the main contact. .

The stopper 16 is provided on the side opposite to the suction side of the mover 12 so that the lever 14 is pressed against the open spring 15 so that the pivot shaft 9 does not rotate over a predetermined angle. have.

As described above, the magnetic contactor drives the movable element 12 by excitation of the electromagnetic magnet 13, and moves the movable contact 1b of the main contact point of the vacuum valve 1 in conjunction with the driving of the movable element 12. Although the main contact points 1a and 1b are opened and closed by driving and folding, the structure of the main circuit part from the vacuum valve 1 to the rotation shaft 9 shows an example, and is not limited to the shape of FIG.

Next, the detail of the vicinity of the electromagnetic magnet 13 and the movable element 12 is demonstrated based on sectional drawing of FIG. 1A, FIG. 2, and FIG.

As shown in the cross-sectional view of FIG. 1A, the electromagnetic magnet 13 includes an electromagnetic coil 18 wound around a trunk portion of a bobbin 17 having collar portions 17a at both ends, and a trunk of the bobbin 17. A cylindrical iron core 19 having a magnetic pole head 19a formed at one end thereof facing the mover 12 on one side thereof, and fixed to the other end side of the iron core 19 by bolts or the like, is fixed to the electromagnetic coil ( It is comprised with the yoke 20 (refer also FIG. 2) provided so that the side part of 18 may be enclosed. The yoke 20 is bolted to the mounting leg 20a installed on the lower side is fixed to the base 10.

On the magnetic pole head 19a side of the iron core 19, a permanent magnet 21 is arranged to suck the movable element 12 and to maintain the input state of the main contact point of the vacuum valve 1. The size of the permanent magnet 21 is approximately the same as the outer diameter of the iron core (19).

As shown in FIG.2 and FIG.3, the tea plate | board 22 of the magnitude | size which covers the magnetic pole head 19a in the collar part 17a of the bobbin 17 by the side of the magnetic pole head 19a of the iron core 19 is removable. Is installed. When the permanent magnet 21 is provided, it is the size which covers the permanent magnet 21 naturally. The vehicle plate 22 is provided to stabilize the suction force, but details of the operation will be described later.

The tea plate 22 uses, for example, a rectangular thin plate made of brass or phosphor bronze. The thickness is, for example, 0.26 mm, and the width is a dimension in which the magnetic pole head 19a (or the permanent magnet 21) is covered as described above, and the bent surface 22a bent at right angles to two opposite sides. Is formed. In each of the bent surfaces 22a, rectangular mounting holes 22b are formed.

On the other hand, the projection part 17b which engages with the mounting hole 22b is formed in the upper and lower sides of the collar part 17a by the side of the pole head 19a of the bobbin 17. As shown in FIG. The dimension between the outer end surfaces of the upper and lower protrusions 17b is set slightly longer than the dimension between the bent surfaces 22a of the vehicle plate 22.

As shown in FIG. 3, the vehicle plate 22 is fitted with one projection hole 17b engaged with one mounting hole 22b of the bent surface 22a, and the other is pushed as shown by an arrow. By utilizing the elasticity of the surface portion 22a, the other projection portion 17b is inserted into the other mounting hole 22b so as to be engaged. The engaged state is FIG. 2.

The relationship between the electromagnetic magnet 13, the vehicle plate 22, and the movable element 12 configured as described above is such that the magnetic pole head 19a of the movable element 12 is attracted when the movable element 12 is attracted to the magnetic pole head 19a. The surface opposite to) is arranged so as to face the surface of the vehicle plate 22 substantially equally so that the gap disappears.

When the movable element 12 is attracted, the surface of the movable element 12 may be in direct contact with the vehicle plate 22, but in contact with the end face of the opening side (the magnetic pole head 19a side) of the yoke 20. Even if it is used for a long time, abnormality is unlikely to occur in parallel with the magnetic pole head 19a.

Next, the operation of the magnetic contactor will be described.

When the contact of the vacuum valve 1 is open, the movable element 12 is pressed by the open spring 15 and is in contact with the stopper 16. When the input instruction is issued to the magnetic contactor, the magnetic coil 18 is excited to generate magnetic flux that turns around the iron core 19, the yoke 20, and the movable element 12, and a suction force is generated in the electromagnetic magnet 13. do. By this suction force, the movable element 12 is attracted to the magnetic pole head 19a side and rotates clockwise in FIG. In conjunction with this, the open / close lever 8 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 is connected to the fixed contact 1a. Abuts. In addition, the contact spring 7 is compressed to a state as shown in Fig. 1 is completed. 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. After the closing is completed, the movable element 12 is attracted by the suction force of the permanent magnet 21, and the closing state is maintained.

When the electromagnetic coil 19 is energized in the reverse direction with the closing command by the blocking command, the repulsive force that overcomes the suction force of the permanent magnet 21 acts on the mover 12, and the force and the open spring of the contact spring 7 are applied. By the force of the pressure pushing the lever 14, the pivot shaft 9 rotates counterclockwise in FIG. 1, and the open / close lever 8 is pushed down, and the movable contact 1b is fixed to the fixed contact 1a. Will be blocked. At this time, the movable element 12 is in contact with the stopper 16 so as not to rotate further.

Next, the operation of the vehicle board 22 will be described.

Generally, the magnetic contactor like this embodiment is used as an opening / closing switch of a power equipment, and therefore opens and closes several hundred thousand times. As for the magnetic pole head 19a of the movable element 12 and the iron core 19 (permanent magnet 21, when providing the permanent magnet 21), it is difficult to make the clearance completely zero, and a slight micro clearance exist. If the gap is changed by the above-described multiple repetitive operations, the electromagnetic force also changes, and the degree of change causes a problem in opening and closing.

4 is a diagram schematically showing the relationship between the gap of the movable part and the electromagnetic force in the magnetic circuit of the electromagnetic magnet. For example, if the initial gap was 0.2 mm and decreased to 0.1 mm due to wear of the contact surface due to prolonged opening and closing operations, the electromagnetic force changes by? F1. If the initial value was 0.5 mm and decreased to 0.4 mm, the electromagnetic force changed by ΔF 2. Even if the amount of decrease in the gap is 0.1 mm which is the same, the amount of change in the electromagnetic force is ΔF1> ΔF2, and it can be seen that the initial gap is greatly different. Therefore, in order to reduce the amount of change in the electromagnetic force, it is preferable that the initial gap is large. However, when the gap becomes large, the electromagnetic force naturally decreases.

Therefore, the magnetic shield plate 22 uses a nonmagnetic member, and advances the magnetic gap having a value of which the electromagnetic force does not decrease much, in advance of the magnetic pole head 19a (or permanent magnet 21) of the movable element 12 and the iron core 19. It is to set between)). Due to the thickness of the magnetic shield plate 22, the magnetic clearance between the movable element 12 and the magnetic pole head 19a (or the permanent magnet 21) is kept substantially constant. As a result, even if a small dimension is reduced, the amount of change in the electromagnetic force can be suppressed small. As described above, the thickness of the vehicle plate 22 serving as the gap is, for example, about 0.26 mm.

In addition, since the vehicle panel 22 is subjected to impacts by opening and closing a plurality of times as described above, wear and deformation may occur due to long-term use. Therefore, it is preferable to replace the vehicle board 22 regularly to maintain stable performance. . In this embodiment, since the vehicle board 22 is detachable, when the vehicle board 22 is replaced, it can be easily removed in the reverse order of the mounting procedure of FIG. It does not require, and can be easily replaced with a new one without using a tool or the like.

In addition, the outer diameter of the permanent magnet 21 is almost the same as the outer diameter of the magnetic pole head 19a, so that the outer diameter of the permanent magnet 21 is fitted to the inner diameter of the trunk portion of the bobbin 17. There are some gaps. Metal foreign matter, dust, or the like may adhere to the gap and the surface of the permanent magnet 21. When a metal foreign material, dust, etc. adhere, a "gap" mentioned above will change.

In this embodiment, since the outer diameter of the permanent magnet 21 (≒ magnetic pole head 19a) is obstructed, the permanent magnet 21 has a shape covered by the primary magnetic plate 22. It can be suppressed that a metal foreign material, dust, etc. adhere. In addition, since the vehicle plate 22 covers a wide surface, it is excellent in impact resistance and hardly causes abrasion or deformation.

In addition, in the above description, the permanent magnet 21 is used as the maintenance of the closing operation. However, after the closing, the current is kept flowing through the electromagnetic coil 18 to maintain the closing or latch mechanism. There is also a way to maintain the input by using, in that case does not require a permanent magnet (21). As there is no permanent magnet 21, adhesion of foreign metal particles is reduced, but the relationship between the gap between the magnetic pole head 19a and the mover 12 is equivalent to the above, and the intrusion of foreign matter and adhesion of dust to the surface The same effect can be expected.

As mentioned above, according to the electromagnetic contactor of Embodiment 1, the electromagnetic magnet which drives a main contact is formed with the electromagnetic coil wound by the bobbin which has a collar part at both ends, and the magnetic pole head which is inserted into the bobbin and opposing a mover at one end side is provided. A large core covering almost the collar of the bobbin by having a yoke fixed to the iron core and the other end side of the iron core so as to surround the side of the electromagnetic coil, and providing a tea plate to cover the pole head of the bobbin on the side of the pole head. It is possible to reduce the amount of deformation and abrasion even in repeated impacts, and to prevent metal foreign matters and dust from adhering to the gap between the bobbin and the iron core and the magnetic pole head.

In addition, the vehicle plate is made of a rectangular plate material, by forming a mounting hole in the bent surface formed on the two opposite sides, by attaching the mounting hole to the protrusion formed on the collar of the bobbin, detachably mounted. It is possible to easily attach and remove the vehicle board without using a fastening member, a tool, or the like, and to provide a highly reliable magnetic contactor in which the vehicle board is not dropped even by opening and closing vibration.

In addition, by providing a permanent magnet for maintaining the state of injection of the main contact between the magnetic pole head and the vehicle plate, a special latch mechanism for holding the input is not required. Can be suppressed, and a highly reliable magnetic contactor can be provided.

1 vacuum valve 12 mover
13 Electromagnet 17 Bobbin
18 Electromagnetic coil 19 Iron core
19a stimulation head 20 yoke
21 Permanent Magnet

Claims (5)

A vacuum valve incorporating an electromagnetic magnet, a mover driven by an excitation of the electromagnetic magnet, and a pair of main contacts driven and foldable in conjunction with driving of the mover; In the magnetic contactor equipped with a vacuum valve,
The electromagnetic magnet,
Electromagnetic coil wound in bobbin,
An iron core inserted into the bobbin and having a magnetic pole head facing the mover at one end thereof;
A yoke provided in a 'co' shape so as to surround the other end side of the iron core and both sides of the electromagnetic coil, the yoke for abutting the movable member at a cross section of the opening side;
And a permanent magnet having an external shape substantially the same as the external shape of the magnetic pole head and fixed to the magnetic pole head to maintain the input state of the main contact point. Claim 1
The iron core has a cylindrical shape, and the outer shape of the magnetic pole head and the outer shape of the permanent magnet are circular magnetic contactor. The method according to claim 1 or 2,
The permanent magnet is fitted to the inner diameter of the body portion of the bobbin. The method according to claim 1 or 2,
And a gap is formed between the mover and the permanent magnet while the mover is in contact with the yoke. The method of claim 4,
The magnetic contactor which covers the said permanent magnet in the said gap is provided.

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