KR19990032397A - Contactor for magnetic contactor - Google Patents

Abstract

The contactor for the magnetic contactor according to the present invention improves the bonding strength of the contact point and the contact point so that the contact point and the contact point are not easily separated by various shocks or vibrations generated when the magnetic contactor is used. And contact surfaces 32 and 42 and contacts 34 and 44 joined to the contact tables 32 and 42, wherein one surface of the contact tables 32 and 42 in contact with the contacts 34 and 44 It is characterized in that a plurality of grooves (35, 45) is formed to improve the bonding strength with the contact strip by melting a portion of the contacts (34, 44).

Description

Contactor for magnetic contactor

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a contactor for a magnetic contactor, and more particularly, to a coupling structure of a contact table and a contact forming a movable and fixed contactor.

In general, a magnetic contactor forms a magnetic switch together with a thermal relay for overload protection of a motor, and performs an opening / closing of an electric circuit. It consists of a contact portion, an electromagnet portion for controlling the operation of the contact portion, an insulating material frame provided with the contact portion and the electromagnet portion, and a crossbar provided on the frame to move up and down for interworking with the contact portion and the electromagnet portion. .

As shown in FIG. 1, the electromagnet portion has a fixed core 20, a bobbin coil 22 for magnetizing the fixed core 20, and a movable core 24 drawn by the magnetized fixed core 20. The movable core 24 is mounted at the lower end of the crossbar 12, and the return spring for returning the pulled movable core 24 to its original position is fixed between the fixed core 20 and the movable core 24. (Not shown) is mounted.

In addition, the contact portion is installed at both ends of the frame 10, and the left and right fixed contactor 30 and the cross-bar 12, which are connected to the power input side terminal and the load side terminal of the electric circuit, respectively, are moved up and down. It consists of a movable contactor 40 for electrically connecting and disconnecting the left and right fixed contactor (30).

Here, as shown in FIG. 2, the fixed contactor 30 has a contact point 32 formed at a distal end thereof with a terminal hole 32a for connection with an electric circuit terminal, and at the other end of the contact point 32. It is composed of an attached contact 34, the movable contact 40 is a contact bonded to both ends of the contact table 42, the contact table 42 so as to correspond to the contact 34 of the fixed contact 30 Each of the contact points 32 and 42 and the contact points 34 and 44 are made of metals of different materials in consideration of conductivity and durability. Has a higher melting point than contacts 34 and 44.

The junction of the contact points 32, 42 and the contacts 34, 44 is generated at the contact points between the weldments by placing and pressurizing the weldment and passing current at the same time as shown in FIG. It is formed by a spot welding method in which welds are fused with resistance heat, and thus the contacts 34 and 44 are connected to the contact points 32 because the melting points of the contact points 32 and 42 are higher than the melting points of the contacts 34 and 44. , 42).

Therefore, according to the electromagnetic contactor configured as described above, when the current is applied to the bobbin coil 22 and the fixed coil 20 is magnetized, the movable coil 24 is attracted by the magnetic force of the fixed coil 20. Accordingly, the contact 34 of the fixed contactor 30 fixed to the frame 10 and the movable contactor 40 installed on the crossbar 12 while the crossbar 12 provided with the movable coil 24 descends are lowered ( 44, the electric circuit is energized, the power supply to the bobbin coil 22 is controlled by a separate control circuit.

On the other hand, when the magnetic contactor is operated, not only severe shock occurs in the process of connecting the contact 34 of the fixed contactor 30 and the contact 44 of the movable contactor 40, but also chattering in the connected state. Due to the vibration caused by the phenomenon, a phenomenon occurs in which the contact points 32 and 42 and the contacts 34 and 44 are separated.

This phenomenon is due to the structural characteristics of the contact points 32 and 42 at the junction of the contact points 32 and 42 and the contacts 34 and 44, so that the thermal diffusion proceeds quickly and the melting temperature is easily lowered. Since the contacts 34 and 44 are not firmly fused, they are further accelerated by weakening the bonding strength of the contact points 32 and 42 and the contacts 34 and 44.

Therefore, according to the conventional contactor for magnetic contactors, there is a problem in that the operation stability of the magnetic contactor is lowered as the contact points 32 and 42 and the contacts 34 and 44 are easily separated.

The present invention has been made in order to solve the problems of the prior art, it is an object of the present invention to provide a contactor for a magnetic contactor to improve the operating stability of the magnetic contactor by improving the bonding strength of the contact point and the contact.

In order to achieve the above object, the present invention includes a contact point and a contact point joined to the contact point, wherein part of the contact point is melted and introduced into one surface of the contact point contacting the contact point, thereby improving bonding strength with the contact point. It provides a contactor for a magnetic contactor, characterized in that a plurality of grooves are formed.

1 is a cross-sectional view showing the structure of a general magnetic contactor

Figure 2 is a partial perspective view showing the structure of a fixed and movable contactor applied to a conventional magnetic contactor

Figure 3 is a partial cross-sectional view showing the thermal diffusion state of the contact point when the junction of the contact point and the contact in the conventional contactor for electronic electromotive

Figure 4 is a partial perspective view showing the contact point of the contactor for the magnetic contactor according to the embodiment of the present invention

Figure 5 is a partial cross-sectional view showing the thermal structure of the contact structure and the contact structure of the contact point and the contact in the contactor for a magnetic contactor according to an embodiment of the present invention

Explanation of symbols for the main parts of the drawings

10 frame 12 crossbar

20: fixed coil 22: bobbin coil

24: movable coil 30: fixed contactor

32: contact point 34: contact point

35: groove 40: movable contact

42: contact point 44: contact

45: home

Hereinafter, embodiments of the present invention will be described in detail with reference to FIGS. 4 to 5, and the same parts as those of the conventional structure of the present invention will be omitted with the same reference numerals.

4 is a partial perspective view showing a contact point of a contactor for a magnetic contactor according to an embodiment of the present invention, Figure 5 is a contact structure and a thermal diffusion state of the contact point and contact in the contactor for a magnetic contactor according to an embodiment of the present invention As a partial cross-sectional view showing a contactor for an electromagnetic contactor according to an embodiment of the present invention consists of a contact point and a contact bonded to one side of the contact point, as shown in FIG. 4, the contact point is in contact with the contacts 34 and 44. A plurality of grooves 35 and 45 are formed on one surface of the bases 32 and 42 by melting part of the contacts 34 and 44 to improve the bonding strength with the contacts 34 and 44.

In addition, the grooves 35 and 45 are rectangular in plan and arranged in parallel to each other, and the cross sections are formed in V-shape, and the arrangement and shape of the grooves 35 and 45 may be variously changed and applied. have.

Referring to the bonding process of the contact point and the contact in the contactor for a magnetic contactor according to the embodiment of the present invention as described above are as follows.

First, it is placed between the two electrodes (E) in a state where the contacts are in close contact with the contacts (32, 42), and a current is passed through the electrodes (E). ) And the contacts 34 and 44 are compressed, heat of resistance is generated at the contact portions of the contact blocks 32 and 42 and the contacts 34 and 44, and the contact blocks 32 and 42 and the contacts ( 34 and 44 are fused to each other, in which the grooves 35 and 45 formed in the contact points 32 and 42 serve as a thermal insulation space for preventing heat transfer in the contact points 32 and 42. The temperature of the bands 32 and 42 rises rapidly.

Therefore, since the high heat formed at the contact points 32 and 42 is applied to the contacts 34 and 44 in contact with the contact points 32 and 42, the meltability of the contacts 34 and 44 is improved, and the molten contact point ( Some of the portions 34 and 44 flow into the grooves 35 and 45 to be fused to each other, and thus the bonding areas of the contacts 34 and 44 with the contact strips 32 and 42 are conventional as shown in FIG. 5. It is much larger than that.

That is, the fusion of the contacts 34 and 44 is improved, and the bonding area of the contacts 34 and 44 and the contact points 32 and 42 is widened, thereby improving the bonding strength.

As described above, according to the present invention, the bonding strength of the contact point and the contact point is improved, and the chattering generated when the contact point of each contactor is connected to the shock generated in the process of disconnecting the fixed contactor and the movable contactor during use of the magnetic contactor. The phenomenon arises that the operation stability of the magnetic contactor is improved because the contact point and the contact are not easily separated by the phenomenon.

Claims (3)

In what consists of a contact stand and the contact joined to the said contact stand, A contactor for a magnetic contactor, characterized in that a plurality of grooves are formed on one surface of the contact surface in contact with the contact portion to improve the bonding strength with the contact portion by melting a part of the contact portion. The method of claim 1, The groove is a contact for a magnetic contactor, characterized in that the plane is made of a rectangular, arranged parallel to each other. The method of claim 1, The groove is a contactor for a magnetic contactor, characterized in that the cross section of the V-shaped.