JP2010251079A - Switch - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a switch of high reliability and long life through restraint of chattering. <P>SOLUTION: In the switch provided with a fixed contact 21 arranged at a fixed contactor 8, and a movable contact 20 arranged at a movable contactor 6 in opposition to the fixed point 21, with each center part of the fixed contact 21 and the movable contact 20 formed thicker than other parts and contacting with each other to make a contact point, the fixed contact 21 and the movable contact 20 has groove parts 23, 22, respectively, formed from an outer periphery side up to a position near the center part toward directions shifted from the center, and shifting directions of the groove parts 23, 22 are structured in the same rotation direction at the fixed contact 21 and the movable contact 20. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention is a switch for switching current, and main application switches are an electromagnetic contactor, an electromagnetic switch, a circuit breaker, and a relay.

  A conventional switch includes a mounting base formed of an insulating material, a fixed iron core laminated with a silicon steel plate on the mounting base, a movable iron core disposed opposite to the fixed iron core and laminated with a silicon steel plate, and a movable iron core. An operation coil for applying a driving force for attracting an iron core and a fixed iron core against a tripping spring, a cross bar formed of an insulator and having a square window, and a movable iron core held at the lower end thereof are provided. Furthermore, a movable contact inserted into the square window of the crossbar and held by a push spring, a movable contact provided on the movable contact, and a fixed contact provided to face the movable contact to conduct current. And a fixed contact provided on the fixed contact and a terminal of the fixed contact. Furthermore, a terminal screw for connecting the electromagnetic switch main body to an external circuit, a base to which a fixed contact is attached, and a cover for covering the upper surface of the electromagnetic switch are provided.

  In the conventional electromagnetic switch, when the operating coil is excited, the movable iron core is attracted to the fixed iron core against the tripping spring, and the crossbar and movable contact move accordingly, and the movable contact contacts the fixed contact. To do. The movable iron core and crossbar continue to move even after contact is made, but the movable contact cannot move because the movable contact is in contact with the fixed contact, the push spring shrinks, and the joint between the movable contact and the fixed contact is pressurized. . For this reason, when the movable contact contacts the fixed contact, chattering due to rebound is suppressed. However, bounce cannot be suppressed completely, and when an electric current is applied, an electromagnetic repulsive force is generated between the contacts, resulting in chattering. When chattering occurs, the contacts are separated and an arc is generated. Due to the heat of the generated arc, the metal material of the contact boils and metal vapor is generated. The generation of metal vapor added a force to separate the contacts, and chattering was more likely to occur. When chattering occurs, contact wear is accelerated by arc heat. Therefore, in order to prevent this, a through hole is formed at each contact. However, when the current value is high, the electromagnetic repulsion force is large and chattering cannot be suppressed (for example, see Patent Document 1).

JP 2006-6516 A

  In conventional switches, chattering occurs after contact collision due to the influence of electromagnetic repulsion, and chattering is more likely to occur due to the pressure of metal vapor due to arcing, so contact consumption is accelerated. There was a problem of short life.

  The present invention has been made to solve the above-described problems, and an object thereof is to provide a switch that suppresses chattering, has high reliability, and has a long life.

The present invention includes a fixed contact disposed on the fixed contact and a movable contact disposed on the movable contact so as to face the fixed contact, and each central portion of the fixed contact and the movable contact is located at other locations. In a switch that is thick and contacts each central part,
The fixed contact and the movable contact are provided with a groove formed to a position near each central part in a direction shifted from the center from the outer peripheral side,
The groove portion is configured so that the directions shifted in the fixed contact and the movable contact are the same in the rotation direction.

The switch according to the present invention includes a fixed contact disposed on the fixed contact and a movable contact disposed on the movable contact so as to face the fixed contact. In a switch that is formed thicker than the part of the
The fixed contact and the movable contact are provided with a groove formed to a position near each central part in a direction shifted from the center from the outer peripheral side,
Since the groove portion is configured with the same rotational direction in the direction of displacement between the fixed contact and the movable contact, since a suction force is generated between the fixed contact and the movable contact, chattering is suppressed, and the reliability is high. Long life.

It is a figure which shows the structure of the switch of Embodiment 1 of this invention. It is a figure which shows the detail of a structure with the movable contact and fixed contact of the switch shown in FIG. It is the top view which showed the structure of each electrode of the movable contact shown in FIG. 2, and a fixed contact. It is a figure for demonstrating the flow of the electric current of the conventional switch. It is a figure for demonstrating the flow of the electric current of the switch shown in FIG. It is the top view which showed the other structure of each electrode of the movable contact and fixed contact of the switch shown in FIG. It is the top view which showed the other structure of each electrode of the movable contact and fixed contact of the switch shown in FIG. It is the top view which showed the other structure of the movable contact of the switch shown in FIG. 1, a stationary contact, and each electrode. It is a figure which shows the other structure of the switch of Embodiment 1 of this invention. It is the top view which showed the structure of the movable contact and fixed contact of the switch shown in FIG.

Embodiment 1 FIG.
Embodiments of the present invention will be described below. 1 is a diagram showing a configuration of a switch according to Embodiment 1 of the present invention, FIG. 2 is a diagram showing details of a configuration of a movable contact and a stationary contact of the switch shown in FIG. 1, and FIG. 4 is a plan view showing the configuration of each electrode of the movable contact and the fixed contact shown in FIG. 2, FIG. 4 is a diagram for explaining the current flow of the conventional switch, and FIG. 5 is the switch shown in FIG. It is a figure for demonstrating the flow of the electric current of a device.

  In the figure, the switch is a mounting base 1 made of an insulating material, a fixed iron core 2 laminated on the mounting base 1 with a silicon steel plate, and a movable core that is placed opposite to the fixed iron core 2 and laminated with a silicon steel plate. An operation coil 4 for applying a driving force for pulling the iron core 3, the movable iron core 3 and the fixed iron core 2 against each other and adsorbing them against the spring, and an insulator are formed. A cross bar 5, a movable contact 6 inserted in a square window of the cross bar 5 and held by a push spring 7, a movable contact 20 provided on the movable contact 6, and a movable contact 6 In order to connect the stationary contact 8 provided oppositely and conducting the current, the stationary contact 21 provided on the stationary contact 8, the terminal 13 of the stationary contact 8, and the electromagnetic switch body to an external circuit. The terminal screw 9 and fixed contact 8 And over scan 10, and a cover 11 for covering the electromagnetic switch top.

  The movable contact 20 is formed in a rivet shape by a movable electrode 202 and a movable electrode base 201 that supports the movable electrode 202. The fixed contact 21 is configured in a rivet shape with a fixed electrode 212 and a fixed electrode base 211 that supports the fixed electrode 212. In addition, each central part of the fixed side electrode 212 and the movable side electrode 202 is formed thicker than the other part, and each central part comes into contact to form a contact point (in the drawing, each central part is the other part). The point where the thickness is formed thicker than the part is omitted.) Each movable contact 20 and fixed contact 21 is formed with a through hole 22 at the center.

  Further, FIG. 3A is a plan view of the fixed side electrode 212 viewed from above in FIG. 2, and the movable side electrode 202 is a plan view of FIG. 2 viewed from below in FIG. As shown in FIG. 3 (b), the movable side electrode 202 and the fixed side electrode 212 have groove portions 23 formed in the vicinity of the respective central portions serving as contact points in a direction shifted from the outer peripheral side to the center. 24. Therefore, the groove portions 23 and 24 are not formed at the positions of the central portions of the fixed contact 21 and the movable contact 20 which are contacts of the switch. And each groove part 23 and 24 is comprised in the rotation direction with the same direction which shifted | deviated in the stationary contact 21 and the movable contact 20. FIG. Further, three grooves 23 and 24 are formed at equal intervals on the outer periphery of the fixed contact 21 and the movable contact 20.

  The operation of the switch of the first embodiment configured as described above will be described. First, when the operation coil 4 is excited, the movable iron core 3 is attracted to the fixed iron core 2 against a tripping spring (not shown), and the crossbar 5 and the movable contact 6 move accordingly, and the movable contact 20 is moved. Contacts the fixed contact 21. The movable iron core 3 and the crossbar 5 continue to move after the contacts 20 and 21 come into contact with each other, but the movable contact 6 cannot move, so that the push spring 7 contracts, and the movable contact 20 is fixed by the push spring 7. 21 is pressed. Then, the joint between the movable contact 20 and the fixed contact 21 is pressurized.

  When a current A is applied from the outside in the direction of the arrow at the left end of the drawing in FIG. 2, the left terminal 13 passes through the fixed contact 8 and the fixed side base 211 passes through the fixed side electrode 212. At this time, the current A of the fixed-side electrode 212 flows from the outer peripheral side toward the center counterclockwise as shown in FIG. 3A because the groove 23 is formed. When the fixed contact 21 and the movable contact 20 are closed, the central portion of the fixed contact 21 and the central portion of the movable contact 20 are thicker than the other portions. The center part of the side electrode 20 contacts. The current A flows from the central portion of the fixed side electrode 21 to the central portion of the movable side electrode 20. Next, since the groove 24 is formed, the current A flowing in the central portion of the movable electrode 20 flows clockwise from the center to the outer peripheral side as shown in FIG. It flows to 201.

  This current flow will be described in comparison with the conventional case and the case of the first embodiment of the present invention. First, in the conventional case, since the current A flowing through the fixed contact and the movable contact flows as shown in FIG. 4A, the forces act in the directions in which the forces repel each other. Therefore, chattering occurs and the contacts are separated. For this reason, an arc is generated as shown in FIG. However, in the first embodiment of the present invention, the current A flowing through the fixed contact 21 and the movable contact 21 flows as shown in FIG. Therefore, a suction force is generated as shown in FIG. Thus, in Embodiment 1 of this invention, since an electromagnetic attractive force acts between the fixed contact 21 and the movable contact 20, chattering can be suppressed.

  In addition, when chattering occurs and an arc is generated, the contact metal boils with heat, and metal vapor spreads in the vicinity of the contact, but the metal is formed by the through holes 22 formed in the movable contact 20 and the fixed contact 21. Since the steam is discharged, it is possible to prevent the movable contact 29 from being lifted by the pressure of the metal steam. The current A flowing through the movable electrode base 201 flows through the movable contact 6 and passes through the movable contact 20 and the fixed contact 21 on the opposite side (the right side in the drawing). At this time, similarly to the case shown above, an electromagnetic attractive force acts and chattering is suppressed. Then, the fixed contact 21 on the opposite side flows through the fixed contact 8 on the right side in the drawing, and the current A flows from the terminal 13 on the right side in the drawing to the outside.

According to the switch of the first embodiment as described above, not only the generation of the electromagnetic repulsive force at the fixed contact and the movable contact can be suppressed, but also the electromagnetic attractive force can be generated at a low cost. A switch having a long life can be obtained. In addition, since three grooves are formed, a current flow can be reliably obtained, and an electromagnetic attractive force can be reliably generated. In addition, since the generated metal vapor is released from the through hole, a switch with high reliability and a long life can be obtained. Moreover, since the fixed contact and the movable contact are formed in a rivet shape, they can be easily attached and detached.
Even when the current A flows in the opposite direction, the same operation as in the first embodiment is performed, and the same effect can be obtained. The same effect can be obtained when an alternating current flows.

  Moreover, although the groove part shown in the said Embodiment 1 showed the example formed in the linear shape, it is not restricted to this, For example, as shown in FIG. The grooves 25 and 26 may be formed in a spiral shape. In this case, since the current flows through the fixed contact 21 or the movable contact 20 in a clockwise direction or a counterclockwise direction, an electromagnetic attractive force can be generated between the contacts more reliably. For this reason, a switch with higher reliability and a longer life can be obtained. In this example, the groove is formed so that the rotation direction is opposite to that of the groove shown in the first embodiment, but the same effect can be obtained.

  Moreover, although the example which provided the three groove parts shown in the said Embodiment 1 was shown, it is not restricted to this, For example, as shown in FIG. 7, equal intervals in the outer periphery of the fixed contact 21 or the movable contact 20 are shown, for example. Four groove portions 27 and 28 may be formed respectively. In this case, an electromagnetic attractive force can be generated between the contacts more reliably. For this reason, a switch with higher reliability and a longer life can be obtained. If the number of the groove portions is three or more, current can be surely passed as shown in FIG. 5B, so that the suction force can be obtained more reliably. However, even if one or two grooves are formed, a certain amount of current flow can be obtained as in the first embodiment.

  Moreover, although the groove part shown in the said Embodiment 1 showed the example formed in the same width, it is not restricted to this, For example, as shown in FIG. 8, the fixed contact 21 or the movable contact 20 is shown. The grooves 29 and 30 may be formed so that the width decreases from the outer periphery to the inner periphery. In this case, an electromagnetic attractive force can be generated between the contacts more reliably. For this reason, a switch with higher reliability and a longer life can be obtained.

  In the first embodiment, an example in which the fixed contact 21 or the movable contact 20 is formed in a rivet shape is shown. However, the present invention is not limited to this. For example, as shown in FIG. It is also conceivable to configure with a brazing. In this case, it can be formed at low cost. And if the groove parts 31 and 32 are formed in the fixed contact 20 and the movable contact 21 similarly to the said Embodiment 1 as shown in FIG. 10, the effect similar to the said Embodiment 1 will be acquired.

6 movable contact, 20 movable contact, 8 fixed contact, 21 fixed contact, 22 through-hole,
23, 24, 25, 26, 27, 28, 29, 30, 31, 32 grooves,
202 movable electrode, 211 fixed electrode, A current.

Claims (6)

A fixed contact disposed on the fixed contact; and a movable contact disposed on the movable contact so as to face the fixed contact, and each central portion of the fixed contact and the movable contact is thicker than other portions. In the switch that is formed and contacts each of the central parts,
The fixed contact and the movable contact include a groove formed in the vicinity of each central portion in a direction shifted from the center from the outer peripheral side,
The switch is characterized in that the groove portion is configured with the same rotational direction in the shifted direction between the fixed contact and the movable contact. The switch according to claim 1, wherein the groove is formed in a spiral shape. The switch according to claim 1, wherein the groove is formed so that a width on a center side is smaller than a width on an outer peripheral side. The switch according to any one of claims 1 to 3, wherein three or more groove portions are formed at equal intervals on the outer periphery of the fixed contact and the movable contact. The switch according to any one of claims 1 to 4, wherein a through hole is provided in the central portion of at least one of the fixed contact and the movable contact. The switch according to any one of claims 1 to 5, wherein at least one of the fixed contact and the movable contact is formed in a rivet shape.

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