JPS6120097B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electromagnetic contactor that interlocks an auxiliary switch.

1 and 2 show a conventional electromagnetic contactor, in which 1 is a case housing the electromagnetic contactor, 2 is a bottom plate attached to the lower part of the case 1, and 3 is mounted on the bottom plate 2 via a buffer plate 4. 5 is a coil wound around the fixed core 3, 6 is a movable core facing above the fixed core 3, and 7 is connected to the movable core 6 with a pin 8, and is always pushed upward by a spring (not shown). The movable contact base is pushed up, 9 is an upper case attached to the upper part of case 1, and 10 is a movable contact that is attached to movable contact base 7 and makes contact with and separates from a fixed contact (not shown) fixed to case 1. 10a is a contact spring that presses the movable contact 10 downward; 11 is an auxiliary switch attached and fixed to the side surface of the case 1; 12 is an auxiliary switch 11
The movable contact bar is always pressed downward by a spring 13 and is engaged with a protrusion 7a of the movable contact base 7 that protrudes toward the auxiliary switch 11 side. 14a, 15
b is an auxiliary movable contact mounted on the movable contact bar 12, 15a and 15b are auxiliary fixed contacts fixed to the auxiliary switch 11, 14a and 15a are normally open contacts, and 14b and 15b are normally closed contacts. .

When current is applied to the coil 5, the fixed core 3 is excited and attracts the movable core 6, and the movable contact 10 descends via the movable contact base 7 and contacts a fixed contact (not shown) to close the circuit. At the same time, auxiliary switch 1
The movable contact bar 12 of 1 moves down in conjunction with the movable iron core 6, and the auxiliary movable contact 14a moves downwards in conjunction with the movable iron core 6.
5a, and the auxiliary movable contact 14b opens the auxiliary fixed contact 15b.

However, in the above state, the force from the spring 13 of the auxiliary switch 11 is applied to the protrusion 7a of the movable contact base 7, so if the auxiliary switch 11 is mounted asymmetrically on only one side, the initial suction In this state, the movable core 6 becomes unbalanced left and right, causing a phenomenon in which it is attracted to the fixed core 3 while tilted and collides with it.
There were drawbacks such as wear due to uneven contact of the iron core and chattering of the contact, which hindered the contact/separation operation of the contact. According to experimental results, the inclination of the movable core at the initial stage of suction determines most of the subsequent movement of the movable core, so it is important to eliminate the inclination of the movable core at the initial stage.

The present invention has been made in view of the above-mentioned drawbacks, and includes moving an auxiliary switch attached to the side of the case on an inclined surface provided on the movable contact base to move the interlocking rod in a direction perpendicular to the moving direction of the movable contact base. By moving the movable contact bar of the auxiliary switch on the other inclined surface of the interlocking rod to open and close, the influence of the auxiliary switch spring on the movable contact base is eliminated, and the movable core is flush with the fixed core. An object of the present invention is to provide an electromagnetic contactor which is made to collide with the iron core, thereby reducing wear on the iron core and improving reliability of the contactor.

An embodiment of the present invention shown in the drawings will be described below. In FIGS. 3 and 4, parts having the same functions as those in FIGS. 1 and 2 are designated by the same reference numerals, and their explanations will be omitted. 16 is the rear part 1 of the auxiliary switch 11 on the case 1 side passing through a groove provided on the side of the case 1.
This is an interlocking rod inserted into a hole provided in 1a and slidably mounted in a direction perpendicular to the moving direction of the movable contact base 7. Slanted surfaces 16a and 16b of about 60 degrees are provided at both ends of the interlocking rod 16 so that the upper part is narrower. Contact bar 1
It is made to oppose the inclined surface 12a provided in 2. 17
is a spring installed in a hole 16c provided in the interlocking rod 16, and is brought into contact with a spring receiver 18 whose one end is locked to the rear surface portion 11a to bias the interlocking rod 16 in the direction of the movable contact base 7. are doing. Furthermore, Teflon is applied to the bottom and side surfaces of the interlocking rod 16 (not shown) so that the interlocking rod 16 can slide with less wear. In this case, the movable contact rod 1 of the auxiliary switch 11
The direction of movement with respect to the movable contact base 7 of No. 2 is opposite to that shown in FIG.
b, 15b constitute a normally open contact.

Next, the action will be explained. When a current is applied to the coil 5, the fixed core 3 is excited and attracts the movable core 6, and when the movable contact base 7 moves downward, the inclined surface 7b of the movable contact base 7 becomes the inclined surface 16a of the interlocking rod 16. The other inclined surface 16b of the interlocking rod 16 moves by pushing the interlocking rod 16 to the right.
The movable contact rod 12 is pushed upward and moved by acting on the inclined surface 12a of the movable contact rod 12. That is, the auxiliary movable contact 14a is disconnected from the auxiliary fixed contact 15a, and the auxiliary movable contact 14b is closed to the auxiliary fixed contact 15b. When the current in the coil 5 is cut off, the movable contact base 7
is moved upward by a spring (not shown), and the interlocking rod 16 loses its rightward pushing force, and is moved leftward by a spring 17 and returns to its original position. At the same time, the movable contact rod 12 is moved downward by the spring 13. That is, the auxiliary movable contact 14a is closed to the auxiliary fixed contact 15a, and the auxiliary movable contact 14b is opened to the auxiliary fixed contact 15b.

When the movable contact base 7 is moving upward, the connection with the interlocking rod 16 is cut off, so the auxiliary switch 1
Since the spring reaction force by the spring 13 of No. 1 does not act on the movable contact base 7, the movable contact base 7 does not tilt in the left-right direction. Further, when the movable contact base 7 moves downward, the interlocking rod 16 and the movable contact base 7 are connected, and the spring reaction force by the spring 13 acts on the movable contact base 7, but the attraction force between the iron cores It is so small that it can be ignored in comparison. Therefore, the movable iron core 6 does not collide with the fixed iron core 3 while being tilted, the eccentricity of the iron core is eliminated, the wear of the iron core is reduced, the service life is extended, and at the same time, the chattering phenomenon of the contactor is also eliminated, resulting in highly reliable electromagnetic A contactor is obtained. Further, many advantages arise, such as smoother operation of the movable iron core 6 and easier operation analysis of the movable iron core 6.

As described above, according to the present invention, the influence of the spring of the auxiliary switch on the movable contact base is eliminated, and the movable contact base does not tilt, so that the movable core does not collide with the fixed core while being tilted. This has an excellent effect in that the wear of the iron core is reduced and the service life is extended, and at the same time, there is no chattering phenomenon of the contactor, and a highly reliable electromagnetic contactor can be provided.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view showing a conventional electromagnetic contactor, FIG. 2 is a longitudinal sectional view taken along line AA in FIG. 1, and FIG. 3 is a longitudinal sectional view showing an embodiment of the electromagnetic contactor of the present invention. The top view and FIG. 4 are enlarged longitudinal sectional views showing the main parts of FIG. 3. 1...Case, 2...Bottom plate, 3...Fixed core, 5...Coil, 6...Movable core, 7...Movable contact base, 8...Pin, 9...Upper case, 11...Auxiliary switch, 12...
Movable contactor, 16... Interlocking rod, 17... Spring, 18...
Spring holder.

Claims (1)

[Claims] 1. A fixed core around which a coil is wound and fixed to a case, a movable core that faces the fixed core and is attracted by the excitation of the coil, and a movable contact that connects to this movable core and connects to and separates from the fixed contact. and an auxiliary switch that is attached to the side surface of the case and connects and separates the auxiliary movable contact attached to the movable contact bar from the auxiliary fixed contact by interlocking the movable contact bar with the contact bar. An interlocking rod is inserted into a hole provided on the rear surface of the case side of the auxiliary switch and is slidably mounted in a direction perpendicular to the direction of movement of the movable contact base, and both ends of the interlocking rod are fitted. A sloped surface is provided in the section so that the upper part is narrow, one sloped surface is formed on the sloped surface provided on the movable contact base, and the other sloped surface is formed on the sloped surface provided on the movable contact bar of the auxiliary switch. An electromagnetic contactor characterized by facing each other.