JP2012009366A - Electromagnetic contactor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To achieve a structure of an electromagnetic contactor which restrains repulsion due to a collision between a housing and a movable insulation base of the electromagnetic contactor when releasing an electromagnet, and has little contact bounce at a closed contact point to improve longevity of the contact point.SOLUTION: A collision surface between a movable insulation base and a housing are formed by two surfaces, one surface vertical to a moving direction of the movable insulation base and another surface parallel to the moving direction, in order to make sure that the surface vertical to the moving direction of the movable insulation base collides first, and then the surface parallel to the moving direction collides. Further, a movable core is positioned slightly apart from the housing so that the movable core contacts the other side of a housing step part when the support of the surface parallel to the moving direction of the movable insulation base collapses. When the surface vertical to the moving direction of the movable insulation base collides, the movable insulation base rotates and is stopped by the surface parallel to the moving direction, and thus a repulsion of the movable insulation base becomes a repulsion in a rotating direction so that the movable insulation base does not go back in a direction which reduces bending of a contact point spring of a closed contact point.

Description

  The present invention relates to a durable electromagnetic contactor in which contact bounce of an auxiliary normally closed contact is suppressed.

  An electromagnetic contactor is composed of a movable insulating base connected to a movable core that supports a movable contact and a housing that stores a fixed core that supports a fixed contact. Between the attraction force of an electromagnet and the movable part and the fixed part, Using the return force of the return spring arranged to open and close the electric circuit by operating the contact, use the normally open contact that closes the electric circuit using the attractive force of the electromagnet and the return force of the return spring There are normally closed contacts that close the electrical circuit.

  The movable insulating table moved by the return force of the return spring collides with the surface perpendicular to the moving direction of the movable insulating table after the contact of the normally closed contact, and is maintained by the return spring.

  The structure of a conventional electromagnetic contactor is shown in FIG. The electromagnetic contactor in which the coil 60 is excited is configured such that the return spring 70 is disposed between the coil 60 and the movable core 30 and the return spring 70 is compressed. When the excitation is stopped, the attractive force is lost between the movable core 30 and the fixed core 40, and the movable insulating base 20 connected to the movable core 30 supporting the movable contact 22 is moved by the return force of the return spring 70, and is normally closed. After the contact is closed, the movable insulating table 20 and the housing 10 collide. The collision at that time occurs between the collision pieces 25, 25 of the movable insulating stand 20 and the first support portions 81, 81 ′ of the housing 10. Then, the repulsion of the movable insulating base 20 occurs in the bending direction of the contact spring 23 of the normally closed contact, and the contact bounce is generated to shorten the contact life. Incidentally, while the electrical durability is about 500,000 times, the mechanical durability is expected to be 10 million times or more.

  Patent Document 1 discloses an invention relating to an improvement of an electromagnetic contactor having a structure in which an electromagnet movable iron core and a movable insulating base that supports a movable contact are connected by a shaft and slides in the opening / closing direction and the circumferential direction of the contact. ing. In this invention, when the movable part is returned, one shoulder of the movable insulating base in a plane perpendicular to the connecting axis between the movable iron core and the movable insulating base comes into contact with the first locking part of the fixed insulating base. Next, a part of the back surface of the movable iron core is brought into contact with the second locking portion of the fixed insulating base on the opposite side of the first locking portion across the connecting shaft in the same plane. The other part of the plane of the movable iron core is received by the first locking part via the movable insulating stand, and in the return completion state, both the magnetic poles of the movable iron core in the same plane are substantially equal to the opposite magnetic poles of the fixed iron core. This is accomplished by configuring it to be kept at a distance.

  Further, Patent Document 2 includes a stopper portion that is formed substantially plane-symmetrically with a plane having a moving direction as a plane direction as a symmetry plane, and collides with the stopper portion of the fixed frame at the moving end to determine the moving end position. The structure that can reduce the impact shock noise at the end of the movement of the movable contact support to a sufficiently low level without causing the movable contact support to be damaged or rebounding. A contactor is disclosed. According to the present invention, a convex portion or a concave portion is fitted on one side of the symmetrical surface of each stopper portion of the fixed frame and the contact support so that they are fitted to each other at the moving end of the support, and one of them is an impact relaxation material. In order to suppress the inclination of the support after fitting, or to provide a buffer on one side of the symmetry surface of either one of the stoppers, and to collide with this buffer A structure is provided in which a shock absorber is arranged at a position to receive the rotation of the subsequent support.

  As described above, Patent Document 1 discloses that the movable insulating base is supported by two surfaces, that is, a locking portion perpendicular to the moving direction and a guide opening portion parallel to the moving direction. It is disclosed that the movable insulating base is supported by a surface of an elastic buffer perpendicular to the moving direction and two surfaces on the upper case side parallel to the moving direction.

  Patent Documents 3 to 5 disclose techniques for buffering by rotating a movable insulating stand after a collision.

Japanese Unexamined Patent Publication No. 63-16518 JP-A-7-130267 Japanese Patent No. 4257391 Japanese Patent Laid-Open No. 61-216215 Japanese Patent Laid-Open No. 2-119024

  In the conventional magnetic contactor, when the electromagnet is de-energized, the normally closed contact is closed while the movable insulating base is moved by the return force of the return spring and collides with the surface perpendicular to the moving direction of the movable insulating base of the housing. However, the movable insulating table is repelled by a collision, and returns to a direction in which the amount of deflection of the contact spring that applies pressure to the contact is reduced. When this return amount exceeds the deflection amount of the contact spring, contact bounce occurs, and the movable contact and the fixed contact are opened, so that contact wear is large and the contact life is remarkably shortened. In addition, each of the above patent documents also discloses a technique for buffering by rotating the movable insulating table after the collision, but in the present invention, the return amount after the collision between the movable insulating table and the housing is reduced, Provided is an electromagnetic contactor that can suppress contact bounce of a normally closed contact, and at the same time can be expected to have a mechanical durability of 10 million times or more exceeding an electrical durability of about 500,000 times.

  An electromagnetic contactor according to the present invention includes a movable insulating base connected to a movable core that supports a movable contact and a housing that stores a fixed core that supports a fixed contact. In the electromagnetic contactor that operates a contact using a return force by a return spring disposed between the housing, a step is formed on a surface of the housing that faces the movable insulating base, and the movable insulating base A collision piece that collides with the stepped portion of the housing is formed only on one of the two sides, and the movable insulating base is supported in one plane perpendicular to the moving direction of the movable insulating base and parallel to the moving direction of the movable insulating base. The movable core is opposed to the other side of the stepped portion formed on the movable insulating table by a small distance, and the surface is parallel to the moving direction of the movable insulating table. When the support of the movable insulating table collapses, the movable core becomes the movable insulating table. Characterized by being configured to abut on the other side of the made a step portion.

  According to the present invention, the return amount in the moving direction of the movable insulating table after the collision between the movable insulating table and the housing is reduced, the contact bounce of the normally closed contact is suppressed, and the electrical life can be improved.

  Furthermore, according to the present invention, it is possible to expect durability exceeding 10 million times of mechanical durability exceeding about 500,000 times of electrical durability.

Structural diagram of an electromagnetic contactor that is an embodiment of the present invention Detailed view of the first collision location of the movable part and the fixed part of the magnetic contactor which is an embodiment of the present invention Detailed view of the first collision point and the second collision point of the movable part and the fixed part of the magnetic contactor according to the embodiment of the present invention. Detailed view of the first collision location of the movable part and the fixed part of the magnetic contactor according to another embodiment of the present invention The detailed drawing of the 1st collision location and 2nd collision location of the movable part and fixed part of an electromagnetic contactor which are another Example of this invention Structure of conventional magnetic contactor

  In order to solve the above-described problem, an electromagnetic contactor according to a specific embodiment of the present invention includes a movable insulating base connected to a movable core that supports a movable contact and a housing that stores a fixed core that supports the fixed contact. The electromagnetic contactor is configured to operate the contact using the attractive force of the electromagnet and the return force of the return spring disposed between the movable part and the fixed part, and the collision surface between the movable insulating base and the casing is It is characterized by two surfaces, one surface perpendicular to the moving direction of the movable insulating table and one surface parallel to the moving direction, and the support of the movable insulating table by one surface parallel to the moving direction of the movable insulating table is broken. In this case, the movable core is configured to come into contact with the other side of the step portion formed on the movable insulating base.

  In the magnetic contactor according to one embodiment of the present invention, the collision surfaces of the movable insulating table and the housing are two surfaces, one surface perpendicular to the moving direction of the movable insulating table and one surface parallel to the moving direction. Therefore, one surface perpendicular to the moving direction of the movable insulating table always collides first, and then one surface parallel to the moving direction collides. When one surface perpendicular to the moving direction of the movable insulating table collides, the movable insulating table rotates and stops rotating on one surface parallel to the moving direction. It is repelled and does not return in the direction of reducing the amount of deflection of the contact spring of the normally closed contact. A movable core is opposed to the other side of the step formed on the movable insulating stand with a slight distance.

  A mode for carrying out the present invention will be described with reference to the drawings. FIG. 1 is a sectional view of an electromagnetic contactor according to the present invention. 2 and 3 are explanatory views of the configuration of the movable insulating stand of the present invention and when the movable insulating stand collides with the casing. In the figure, the same reference numerals are used for components having the same functions as those of the conventional electromagnetic contactor shown in FIG.

  As shown in FIG. 1, the electromagnetic contactor in which the coil 60 is excited is configured such that a return spring 70 is disposed between the coil 60 and the movable core 30 and the return spring 70 is compressed. When the excitation of the coil 60 is stopped, the attractive force disappears between the movable core 30 and the fixed core 40, and the movable insulating base 20 connected to the movable core 30 that supports the movable contact 22 by the return force of the return spring 70. In FIG. 1, it moves to the left, and after the normally closed contact is closed, a collision between the movable insulating base 20 and the housing 10 occurs. The collision between the movable insulating table 20 and the housing 10 first collides with the collision piece 25 of the movable insulating table 20 and the first support portion 81 provided on the housing 10 (FIG. 2). Here, it is clear when FIG. 6 of the conventional example is compared with FIG. 1 of the present invention. In the movable insulating base 20 of the conventional example, collision pieces 25 and 25 are provided on both sides of the movable insulating base 20. However, in the movable insulating stand 20 of the present invention, the collision piece 25 is provided only on one side. Further, the casing 10 is formed with a stepped portion 80 for receiving the collision of the movable insulating stand 20, but the portion supported by colliding with the stepped portion 80 is one side of the movable insulating stand 20 ( The collision piece 25 provided only on the lower side of FIGS. 1 to 3 is a first support portion 81 that supports the collision piece 25. That is, one side of the step portion 80 (the lower side in FIGS. 1 to 3) is the first support portion 81, and this first support portion 81 is also the side where the collision piece 25 of the movable insulating base 20 is provided ( It is provided only on the lower side of FIGS. Since the collision piece 25 is not provided on the movable insulating base 20 on the other side of the stepped portion 80 (upper side in FIGS. 1 to 3), the movable insulating base 20 and the housing 10 do not collide.

  As described above, since the collision piece 25 is provided only on one side (the lower side in FIGS. 1 to 3) of the movable insulating table 20, the collision between the movable insulating table 20 and the housing 10 is performed on one side ( 1 to 3), and a rotational moment is generated in the movable insulating base 20 from the positional relationship between the operating point of the return spring 70 and the first support portion 81, and the movement of the movable insulating base 20 is the first. It changes into a rotational motion starting from the collision with the support portion 81, and rotates counterclockwise so that the tip portion of the movable insulating base 20 collides with the second support portion 82 (FIG. 3). Thus, there is no need to provide a special member or the like, the repulsive force of the movable insulating base 20 does not occur in the bending direction of the contact spring 23 of the normally closed contact, the contact bounce can be suppressed, and the contact life is improved. be able to.

  In the above embodiment, the first support portion 81 constituting the stepped portion 80 of the housing 10 is also provided only on the side where the collision piece 25 of the movable insulating base 20 is provided (the lower side in FIGS. 1 to 3). The present invention has been described with a focus on the configuration. However, the present invention does not necessarily require only this configuration. First, what is necessary in the present invention is to prevent the repulsive force of the movable insulating base 20 from being generated in the bending direction of the contact spring 23 of the normally closed contact. That is, since the first support portion 81 of the housing 10 is formed as one side of the step portion 80 (the lower side of FIGS. 4 and 5), naturally, the first support portion 81 of the case 10 is formed. A third support portion 81 ′ is formed in the step portion 80 on the opposite side (the upper side in FIGS. 4 and 5). Thus, even if the support portion is configured as a pair of support portions 81 and 81 ′ (first support portion 81 and third support portion 81 ′) in the step portion 80 of the housing 10, the other third portion is supported. There is no problem as long as the support portion 81 ′ is formed so as not to collide with the movable insulating base 20 and the movable core 30 (the degree disclosed in FIG. 5).

  Rather, in the initial design, the third support portion 81 ′ on the other side (the upper side in FIGS. 4 and 5) of the stepped portion 80 of the housing 10 is positioned so that the movable insulating base 20 and the movable core 30 do not collide with each other. It is important to form in As described above, the third support portion 81 ′ of the stepped portion 80 of the housing 10 is provided to be opposed to the movable core 30 with a slight gap, which further increases the effect of the present invention. That is, in the present invention, a highly durable electromagnetic contactor can be provided by the first support portion 81 and the second support portion 82 described with reference to FIG. 2 and FIG. In the case of a device that can withstand this, the third support portion 81 ′ described with reference to FIGS. 4 and 5 functions as a new support portion instead of the second support portion 82, thereby providing mechanical durability. It is possible to provide an electromagnetic contactor having a further increased number. For this purpose, the third support portion 81 ′ on the other side (the upper side in FIGS. 4 and 5) of the stepped portion 80 of the housing 10 is positioned so that the movable insulating base 20 and the movable core 30 do not collide intentionally. It is essential to form.

DESCRIPTION OF SYMBOLS 10 Case 20 Movable insulation stand 22 Movable contact 23 Contact spring 25 Colliding piece 30 Movable core 40 Fixed core 60 Coil 70 Return spring 81 1st support part (1st support surface)
82 2nd support part (2nd support surface)

Claims (1)

  A return spring that is composed of a movable insulating base connected to a movable core that supports a movable contact and a housing that stores a fixed core that supports a fixed contact, and is arranged between the attractive force of the electromagnet and the movable portion and the fixed portion. In the electromagnetic contactor that operates the contact using the return force of the step, a step is formed on a surface of the housing that faces the movable insulating base, and only one of the movable insulating bases Forming a collision piece that collides with the stepped portion, the support of the movable insulating table is two surfaces, one surface perpendicular to the moving direction of the movable insulating table and one surface parallel to the moving direction of the movable insulating table, On the other side of the step formed on the movable insulating table, a movable core is opposed to a small distance so that the support of the movable insulating table by one surface parallel to the moving direction of the movable insulating table is broken. When the movable core is in contact with the other side of the step formed on the movable insulating base, Electromagnetic contactor, characterized by being configured so as to contact the.