JPH10334784A - Electromagnetic contactor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce force for pushing back a moving core, reduce the fluttering of the moving core and contact jump by absorbing the collision energy of the moving core as strain energy and dispersing it in an electromagnetic contactor. SOLUTION: An electromagnetic contactor has a fixed core 12 formed by winding a coil 31, a moving core 22 moving in the same direction as the contact parting direction, a moving insulation table 21 supporting a moving contact 24, a return spring 32 arranged so as to part the moving core 22 from the fixed core 12, and a fixed insulation table 11 which houses each component and supports the fixed contact 14. The fixed core 12 is fixed to the fixed insulation table 11 with a buffer member 41 formed by stacking plate-shaped bodies.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic contactor, and more particularly, to absorbing and dispersing a flutter of a movable core caused by a collision between a movable core and a fixed core caused by suction of an electromagnetic coil by a buffer structure acting on the fixed core and the movable core. To reduce the contact jump of the movable contact that moves with the movable core,
The present invention relates to an electromagnetic contactor that suppresses contact wear.

[0002]

2. Description of the Related Art An electromagnetic contactor is known as a device for opening and closing an electric circuit using an electromagnet, and is used for remote control in electric equipment such as a motor circuit. In an electric facility for starting a load having a large starting current, when there is no margin in the capacity of a power supply for supplying power to the load, there is a phenomenon in which the voltage of the circuit is reduced by the starting current in the starting state of the load. In this electric equipment, if the power supply for the coil of the electromagnetic contactor is taken from the same power supply as the load, a voltage drop due to the starting current of the load causes a shortage of the attractive force of the movable core. FIG. 5 illustrates this phenomenon. Curve A is an attractive force curve representing the relationship between the attractive force of the coil and the distance between the movable core and the fixed core when a rated voltage is applied. The curve A moves to a curve B due to a decrease in the attraction force in a state where a voltage drop of the circuit occurs due to the starting current. Note that the characteristic C represents a load force by the return spring and the contact spring of the electromagnetic contactor. FIG. 6 is a timing chart showing the operating voltage, the opening and closing of the main contact, and the load current, and shows that the operating voltage of the coil is reduced by closing the main contact and flowing the starting current. In this state, if the movable core of the electromagnetic contactor collides with the fixed core and flutters, the depolarization distance between the movable core and the fixed core increases due to insufficient suction force, and the movable contact that moves accompanying the movable core becomes a contact. Make a jump.

Since a large starting current is opened and closed by the contact jump, there is a problem that the contact is worn out and the electrical durability is reduced. It has been proposed to employ various buffer structures for the movable core and the fixed core. ing. For example, as described in JP-A-59-123205, there is a device using an elastic material such as rubber as a cushioning member. In this case, the collision energy between the movable core and the fixed core due to the attraction of the electromagnet coil is temporarily absorbed as the strain energy of the buffer member, but there is no structure for dispersing this energy. Therefore, when the strain energy is released in this buffer structure, the movable core is pushed back when the strain energy is released, and the movable core is separated from the fixed core and flutters. If this flutter occurs when the voltage applied to the electromagnet coil decreases, the separation distance between the cores increases, causing a contact jump at the contact part that moves accompanying the movement of the movable core. There was a phenomenon of wear.

Further, the use of a fluid viscous damper or particles as a buffer structure is disclosed in Japanese Utility Model Laid-Open No. 6-71982,
Although known as described in Japanese Patent Application Laid-Open No. 4-83312, these methods have problems in handling, such as the necessity of preparing a container for containing a fluid or particles.

[0005]

SUMMARY OF THE INVENTION The present invention reduces the force for pushing back the movable core by absorbing and dispersing the collision energy of the movable core as strain energy, thereby reducing fluttering of the movable core and contact jump. , Which are easy to handle.

[0006]

According to the present invention, there is provided a fixed core having a coil wound thereon, a movable core provided to be movable in the same direction as the opening direction, a movable insulating table for supporting a movable contact, In an electromagnetic contactor including a return spring arranged to open a core from the fixed core and a fixed insulating table that stores the components and supports a fixed contact, the fixed core includes a plate-shaped body. It is an electromagnetic contactor attached to the fixed insulating base with a laminated buffer member.

The present invention is also an electromagnetic contactor in which a part of the plate-like body is a vibration-damping steel plate in which a metal plate is coated with a resin.

According to the present invention, there is provided a fixed core having a coil wound thereon, a movable core provided to be movable in the same direction as the opening direction, a movable insulating table supporting a movable contact, and the movable core fixed to the fixed core. A return spring arranged to open from the core,
In the electromagnetic contactor containing the respective components and a fixed insulating table supporting a fixed contact, the contact surface of the movable core and the contact surface of the fixed core are each formed of two planes,
The electromagnetic contactor is parallel to each other, and is further arranged so that the intersection of the two planes is shifted in a direction orthogonal to the opening direction.

Further, the present invention provides a fixed core having a coil wound thereon, a movable core provided to be movable in the same direction as the opening direction, a movable insulating table for supporting a movable contact, and the movable core fixed to the fixed core. A return spring arranged to open from the core,
In the electromagnetic contactor including the respective components and a fixed insulating table supporting a fixed contact, the fixed insulating table includes an elastic member, and the elastic member is separated from the movable core by a space before the contact. And a magnetic contactor that presses the movable core from both sides when contacting.

The present invention also provides a fixed core having a coil wound thereon, a movable core provided to be movable in the same direction as the opening direction, a movable insulating table for supporting a movable contact, and the movable core fixed to the fixed core. A return spring arranged to open from the core,
A fixed insulating table that houses the components and supports a fixed contact, wherein the fixed insulating table rotates on both sides in the longitudinal direction of the fixed core in accordance with the movement of the movable core. And the rotation supporting member keeps space with the movable core by a cushioning member spring attached to both rotation supporting members before the contacting pole, and
An electromagnetic contactor that is rotated by a projection provided on the movable core at the time of contact.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described. An embodiment of the electromagnetic contactor of the present invention will be described with reference to FIGS.

FIG. 1A is a side sectional view of an electromagnetic contactor according to a first embodiment, and FIG. 1B is an explanatory view of a fixed core, a movable core and a cushioning member of the electromagnetic contactor. is there. The electromagnetic contactor of this embodiment includes a fixed insulating base 11, a fixed core 12, a movable insulating base 21, a movable core 22, a coil 31, and a return spring 32.
Etc. are provided. The fixed core 12 and the movable core 22 are arranged to face each other with the coil 31 interposed therebetween. The movable core 22 is connected to the movable insulating base 21 by a connecting member 23,
The movement of the movable core 22 is transmitted to the movable contact 24. The movable contact 24 is arranged to face the fixed contact 14 in a state where the movable contact 24 is supported by the movable insulating table 21 by the pressing of the contact spring 25. These are accommodated in the fixed insulating stand 11. In a state where the electromagnetic contactor is not operating (OFF state), the movable core 22 is pressed by the return spring 25 in a direction away from the fixed core 12, and is separated from the fixed core 12 by a predetermined first interval Ga. It is in an extreme state. This state is transmitted to the movable contact 24 via the movable insulating base 21, and the movable contact 24 and the fixed contact 14 are also separated from each other by a predetermined second interval Gb. When an operation voltage is applied to the coil 31 of the electromagnetic contactor, the movable core 22 is attracted to the fixed core 12 by the attraction force of the magnetic flux generated by the coil 31 and starts moving. When the moving distance becomes the second interval Gb, the movable contact 24 and the fixed contact 14 come into contact, and the electromagnetic contactor is turned on. Further, when the movable core 22 moves and the moving distance becomes the first interval Ga, the movable core 22 collides with the fixed core 12 and comes into contact with the movable core 22 to terminate the operation. At the moment when the movable core 22 collides with the fixed core 12 in this process, a repulsive force acts between the movable core 22 and the fixed core 12 due to the collision energy of the movable core 22, and the movable core 22 retreats from the fixed core 12 to become a force that retreats from the fixed core 12. And the fixed core 12 are separated. This depolarization is transmitted to the movable contact 24 by the movable insulating base 21, which may lead to the separation between the movable contact 24 and the fixed contact 14,
A contact stroke G is provided between the movable contact 24 and the fixed contact 14.
If there is c (= Ga−Gb) and the depolarization does not exceed the contact stroke Gc, the movable contact 24 and the fixed contact 14 do not separate. In order to reduce this depolarization, a hole 12a is provided in the fixed core 12, and a buffer member 41 is inserted into the hole. The cushioning member 41 consumes and disperses the collision energy of the movable core 22 by the deformation and friction of the cushioning member 41, and reduces the repulsive force of the fixed core 12 to the movable core 22.

The cushioning member 41 will be described in detail with reference to FIG. 1B. The cushioning member 41 is formed by laminating plate-like bodies, is inserted into the hole 12a of the fixed core 12, and is provided with an end 41a. Are attached to the fixed insulating material 11. Due to the collision energy of the movable core 22, the fixed core 1
When 2 is pressed, the radius of curvature of the cushioning member 41 changes. This change in the radius of curvature causes the contact surface to shift between adjacent plate-like bodies due to the longitudinal expansion and contraction of the concave surface and the convex surface of the curved surface being contradictory, and a frictional force is generated. The collision energy of the movable core 22 is dispersed and consumed by this friction. As a result, the repulsive force of the fixed core 12 on the movable core 22 can be reduced.

Although a plurality of plate-like members have been described, a damping steel plate in which a metal plate is coated with a resin (rubber or the like) may be used as a part of the plate-like member. At that time, the expansion and contraction of the metal plate is absorbed by the resin,
The collision energy of the movable core 22 can be absorbed.

FIG. 2A is a side sectional view of an electromagnetic contactor according to a second embodiment, and FIG. 2B is an explanatory view of a movable core and a fixed core of the electromagnetic contactor. In this embodiment,
The structure of the electromagnetic contactor is such that a buffer portion 42 is provided instead of the buffer member 41 in the embodiment of FIG. As the buffer portion 42, the tangential surfaces of the fixed core 12 and the movable core 22 are each formed of two planes, and are parallel to each other. Further, the intersection of the two planes is shifted in a direction orthogonal to the opening direction. The arrangement has been made. The tangent surfaces are parallel to each other, and the intersection of the two planes is displaced in a direction orthogonal to the opening direction, so that when the movable core 22 moves in the direction of the fixed core 12 and comes into contact, The movable core 22 is guided to shift laterally, whereby the collision energy can be changed in the lateral direction and can be attenuated by friction or the like at a contact portion between the two cores.

FIG. 3 is a side sectional view of an electromagnetic contactor according to a third embodiment. In this embodiment, the structure of the electromagnetic contactor is:
In this embodiment, a buffer member 43 is provided instead of the buffer member 41 in the embodiment of FIG. As the buffer member 43,
An elastic member 43a is provided on a side surface of the fixed insulating base 11. The collision energy is attenuated by the buffer member 43. The elastic member 43a is deformed, and absorbs collision energy by friction between the elastic member 43a and the movable core 22. Since the deformation energy acts in a direction orthogonal to the moving direction of the movable core 22, it does not become a repulsive force for pushing back the movable core 22, and the collision energy of the movable core 22 can be attenuated.

FIG. 4 is a side sectional view of an electromagnetic contactor according to a fourth embodiment. In this embodiment, the structure of the electromagnetic contactor is:
In this embodiment, a buffer member 44 is provided instead of the buffer member 41 in the embodiment of FIG. The cushioning member 44 includes a main body 441, a rotating body 442, and a cushioning member spring 443, and is attached to both sides of the fixed core 12. Main body 441
Is rotatably supported by the fixed insulating base 11, and has a rotating body 442 at one end, a cushioning member spring 443 attached to the other end, and a cushioning member spring 4
The main body portions 441 on both sides are supported by each other via 43. When the movable core 22 moves to a position where the movable core 22 collides with the fixed core 12, the inclined portion 22 a provided on the movable core 22 hits the rotating body 442 and attempts to move the rotating body 442. When the rotating body 442 is moved, energy for contracting the buffer member spring 443 is required, and the collision energy is used as this energy, and the collision energy is absorbed. Inclined portion 22a and rotating body 44
Numeral 2 is used to move the cushioning member 44 sideways, and therefore needs to have an appropriate shape.

As described above, according to the first to fourth embodiments,
Since the collision energy of the movable core 22 is absorbed and attenuated,
The fixed core 12 does not repel the movable core 22. And the handling of the buffer member is also simple.

[0019]

According to the present invention, the collision of the movable core caused by the attraction of the coil of the electromagnetic contactor can be absorbed and dispersed by the buffer member and the buffer portion acting on the fixed core and the movable core. It is possible to reduce fluttering and contact jumps, and suppress consumption of the contacts.

[Brief description of the drawings]

FIG. 1 is a side sectional view of an example of a first embodiment of the electromagnetic contactor of the present invention.

FIG. 2 is a side sectional view of an example of a second embodiment of the electromagnetic contactor of the present invention.

FIG. 3 is a side sectional view of an example of a third embodiment of the electromagnetic contactor of the present invention.

FIG. 4 is a side sectional view of an example of a fourth embodiment of the electromagnetic contactor of the present invention.

FIG. 5 is an explanatory diagram of an attraction force curve of an electromagnetic coil and a load characteristic by a spring.

FIG. 6 is an explanatory diagram of a timing chart of a coil applied voltage, opening / closing of a contact, and a load current.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Fixed insulating stand 12 Fixed core 14 Fixed contact 21 Movable insulating stand 22 Movable core 22a Inclined part 23 Connecting member 24 Movable contact 25 Contact spring 31 Coil 32 Return spring 41, 42, 43, 44 Buffer member, buffer part 441 Buffer member body Part 442 Buffer member rotating body 443 Buffer member spring

Claims (5)

[Claims] 1. A fixed core wound with a coil, a movable core movably provided in the same direction as an opening direction, a movable insulating table supporting a movable contact, and opening the movable core from the fixed core. An electromagnetic contactor comprising: a return spring disposed so as to perform the above-described operation; and a fixed insulating table that stores the respective components and supports a fixed contact. An electromagnetic contactor mounted on a table. 2. The electromagnetic contactor according to claim 1, wherein a part of the plate-like body is a damping steel plate in which a metal plate is coated with a resin. 3. A fixed core around which a coil is wound, a movable core provided so as to be movable in the same direction as the opening direction, a movable insulating table supporting a movable contact, and opening of the movable core from the fixed core. In the electromagnetic contactor provided with a return spring disposed so as to accommodate the respective components, and a fixed insulating table supporting a fixed contact, the contact surface of the movable core and the contact surface of the fixed core are: An electromagnetic contactor comprising two planes, which are parallel to each other, and wherein the intersections of the two planes are shifted in a direction orthogonal to the opening direction. 4. A fixed core wound with a coil, a movable core movably provided in the same direction as the opening direction, a movable insulating table supporting a movable contact, and opening the movable core from the fixed core. A return spring disposed so as to accommodate the above-mentioned components, and a fixed insulating table that stores the respective components and supports a fixed contact, wherein the fixed insulating table includes an elastic member, and the elastic member includes: An electromagnetic contactor characterized in that a space between the movable core and the movable core is maintained before the contact, and the movable core is pressed from both sides during the contact. 5. A fixed core wound with a coil, a movable core movably provided in the same direction as an opening direction, a movable insulating table supporting a movable contact, and opening the movable core from the fixed core. An electromagnetic contactor provided with a return spring disposed so as to perform the above operation, and a fixed insulating table that stores the respective components and supports a fixed contact, wherein the fixed insulating table is provided on both sides in the longitudinal direction of the fixed core. A rotation support member that rotates with the movement of the rotation support member is attached, and the rotation support member maintains a space with the movable core by a buffer member spring attached to each of the rotation support members before the contact, and An electromagnetic contactor characterized in that it is rotated by a projection provided on the movable core at an extreme time.