JPH017944Y2 - - Google Patents

Description

[Detailed explanation of the idea] [Industrial application field] The present invention relates to an electromagnetic contactor.

[Conventional technology]

In general, an electromagnetic contactor consists of an electromagnetic operation section whose main components are an operation coil, an iron core, a yoke, and a movable armature, a support metal fitting that receives this electromagnetic operation force via a lever, a contact base, a movable contact, and a flexible armature. It consists of a movable contact section whose main component is a conductor, a fixed contact section which also functions as a blowing coil, an iron core, a fixed contact, and a fixed arc horn, an arc chute, and an interlocking contact.

[The problem that the idea attempts to solve]

In the above conventional electromagnetic contactor, the movable contact contacts the fixed contact and has sufficient overtravel (wipe).
There was a problem in which microscopic japs (chatter) occurred in the contact during transient phenomena.

The purpose of the present invention is to minimize the time of the primary chatter that occurs at the moment the movable contact contacts the fixed contact and the secondary chatter that occurs thereafter, or at least minimize the time of the secondary chatter to zero.
To provide an electromagnetic contactor which prevents damage and welding of contacts and has a long life.

[Means to solve the problem]

In order to achieve the above object, the present invention arranges a fixed contact, a movable contact, a contact base, a supporting metal fitting, and an electromagnetic operation part between a pair of left and right insulating bases, and also arranges the movable contact in the A first spring that pulls in the direction of separation from the fixed contact is provided across the contact base and the insulating base, and a second spring that pulls the movable contact in the direction of contact with the fixed contact. A spring is provided across the contact base and the support fitting.

〔Example〕

Embodiments of the present invention will be described below with reference to FIGS. 1 to 4. First, an electromagnetic contactor can be roughly divided into an electromagnetic operating part, a movable contact part, and a fixed contact part.
and is held between the insulating base 2 on the right side.
The yoke 3 of the electromagnetic operation section is approximately L-shaped, and its end face is supported by fastening screws 3a, 3a, etc. from both sides. This yoke 3 has an iron core 5 through which an electromagnetic operation coil 4 is inserted.
is supported by fastening screws or bolts 5a, 5a. The head 5b of the iron core 5 returns the movable armature 6 against the spring 8 and magnetically attracts it. The stopper 8 positions the movable armature 6 before operation;
An interlocking auxiliary contact 41 and an insulating stand 43 are mounted on the back. A support shaft 9 is provided at the tip of the movable armature 6, and supports a lever 10 movably. This lever 1
The end of 0 is connected to a supporting metal fitting 12 constituting a movable contact portion by a support shaft 12a to constitute a link. The support fitting 12 is connected to the insulating bases 1 and 2 by the support shaft 11.
It is rotatably supported by a member attached to the. The support fitting 12 is connected to the contact base 14 by a support shaft 15.
The movable contact 16 and the terminal 22a of the flexible conductor 22 are fastened to the contact base 14. Then, the contact base 14 and the insulating base 1,
Wipe and return spring 1, which is the first spring, between
7 is straddled. On the other hand, the other end of the flexible conductor 22 is guided to the conductor 23 and drawn out as a terminal 23a. Mechanical contact of the movable contactor 16 with the fixed contactor 18 on the other side is performed by magnetic attraction of the movable armature 6. That is, the magnetic attraction of the armature 6 uses the knife edge 6a as a hinge and moves counterclockwise against the component force of the wipe/return spring 17 until it abuts against the core head 5b. This movement causes the lever 10 supported by the support shaft 9 to move from the illustrated inclination to a more vertical direction. With this movement, the spindle 11
The support fitting 12 moves in an arc counterclockwise around the center. At this time, the contact base 14 is
The fixed contact 18 moves in the same counterclockwise direction against the force of the wipe/return spring 17 applied to a.
come into contact with.

A fixed contact 18 constituting a fixed contact portion is fixed to a fixed contact stand 21 and connected to one end of a blowing coil, and is further connected to a blowing coil 20 wound around an iron core 19.
It is drawn out from the terminal 20a through the terminal 20a.

With the above configuration, the switching current is from the terminal 20a,
Blowing coil 20, contact base 21, fixed contact 1
8, it passes through the movable contact 16, the flexible conductor 22, and the conductor 23, and flows to the terminal 23a. Naturally, a large arc is generated when the movable contactor 16 is opened, so the arc is extinguished by the arc shoot 40.

Furthermore, interlocking auxiliary points can also be incorporated.

Further, as shown in FIGS. 4a and 4b, the wipe/return spring 17 must be set so that the operating voltage (or current) of the contactor satisfies a desired value. The pressure (initial pressure) when the contact 16 comes into contact with the contact 18 also has the desired value (experientially 1 kg or more), and the pressure (final pressure) when fully activated also has the desired value. (4 kg or more based on experience).

Although it is theoretically possible to satisfy the initial pressure, final pressure, and contactor operating voltage using two left and right wipe/return springs 17 (see Fig. 4b), it is possible to do so in a small space within a limited space. If I wanted to, I wouldn't be able to make it bigger due to the dimensions. Therefore, if the wipe/return spring 17 is designed to give priority to the operating voltage of the contactor, after the contactor 16 has completely contacted the fixed contactor 18, the contactor base 14, The inertial energy of the contact 16 and the flexible conductor 22 is dissipated by the kinetic energy of the contact base 14.
That is, the spring hook 14a of the contact base 14 slightly moves clockwise, and as a result, the current-carrying point A is instantaneously opened. This is the secondary chatter.

This can be prevented by providing another set of second springs 27, 27 between the spring hook 14a and the support shaft 12a of the lever 10. Specifically, the spring 27 may have a spring constant that can add weight to the initial pressure and final pressure and suppress slight movement of the spring hook 14a. According to calculations and experiments, secondary chatter can be completely suppressed if it is 0.25 kg or more on one side (0.5 kg or more for one set).

Now, as shown in FIG. 4b, the spring 27 acts as a tension spring between the originally required spring hook 14a and the support shaft 12a, which was also originally required as the link shaft of the lever 10. Since no special dedicated parts are required for the spring 27, it is advantageous in terms of cost.

[Effect of idea]

According to this proposal, two problems arise as electromagnetic contactors.
This has the effect of suppressing secondary chatter and reducing primary chatter since the initial pressure can be set freely. Furthermore, since each component of the electromagnetic contactor is supported by a pair of left and right insulating bases, each component is stably supported and its life can be extended.

[Brief explanation of drawings]

Fig. 1 is a front view showing an embodiment of the electromagnetic contactor according to the present invention, Fig. 2 is a right side view of Fig. 2, Fig. 3 is a left side view of Fig. 1, and Figs. 4 a and b are FIG. 2 is an enlarged front view and a plan view of main parts. 4...Operating coil, 5...Iron core, 3...Yoke,
6... Movable armature, 10... Lever, 12... Support metal fittings, 14... Contact base, 16... Movable contact, 17... Wipe and return spring (first spring),
22... Flexible conductor, 20... Blowing coil, 19...
... Iron core, 21 ... Fixed contact base, 40 ... Arc chute, 41 ... Interlocking auxiliary contact, 14a ... Spring hook, 12a ... Support shaft, 27 ... Spring (second spring).

Claims (1)

[Scope of utility model registration request] An insulating base, a fixed contact supported by this insulating base, a movable contact that performs contact and separation operations with respect to this fixed contact, a contact base that supports this movable contact, and this In an electromagnetic contactor comprising a support fitting that pivotally supports a contactor base and is pivotally supported by the insulating base, and an electromagnetic operating section that drives the support fitting and is supported by the insulating base, the insulating base are a pair of left and right insulating bases, between which the fixed contact, the movable contact, the contact stand, the supporting metal fittings, and the electromagnetic operating section are arranged, and a first A spring is provided between the contact base and the insulating base, and a second spring that pulls the movable contact in the contact direction is provided between the contact base and the support fitting. Electromagnetic contactor.