JPH0635341Y2 - Electromagnetic contactor - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an electromagnetic contactor including a surge absorber that absorbs an arc generated at a contact when a main circuit is opened and closed.

[Background Art] An electromagnetic contactor has a problem that an arc is generated by opening and closing a contact, and the arc is transmitted as noise to another device via a power supply line, causing another device to malfunction. Therefore, a surge absorbing element is used to absorb the arc generated when the electromagnetic contactor is opened and closed. A general surge absorbing element 1'of this type is shown in FIG. As shown in FIGS. 4A to 4C, the surge absorbing element 1'is composed of a resistor R and a capacitor C, or an arrester A, or an arrester A, a resistor R, and a capacitor C.

However, when the surge absorbing element 1'of this type is attached to the electromagnetic contactor, the surge absorbing element 1'must be attached to each pole individually, which causes a problem of troublesome attachment of the surge absorbing element 1 '. there were. Further, there is a problem that vibration and shock are applied to the surge absorbing element 1'when the contacts of the electromagnetic contactor are opened and closed, and the surge absorbing element 1'is adversely affected.

[Object of the Invention] The present invention has been made in view of the above-mentioned points, and an object of the present invention is to install a surge absorber easily and in a state where it is strong against vibration and shock. It is to provide an electromagnetic contactor capable of performing.

[Disclosure of the Invention] An embodiment of the present invention will be described with reference to FIGS. 1 and 2. In the electromagnetic contactor X of the present embodiment, an outer shell is composed of a box-shaped body 6 having an open top surface and a terminal cover 20 attached to the top surface of the body 6, and the terminal cover 20 is an assembly screw.
It is combined with the body 6 at 21. A fixed iron core 9 is housed in the body 6, and a coil frame 7 in which a coil 8 is wound so as to pass through the upper portion of the fixed iron core 9 is housed. Inside the terminal cover 20, a movable body 12 to which a movable iron core 10 is integrally attached is housed so as to be vertically movable. Here, the movable body 12 is biased upward by the spring 11 so that the movable body 12 is positioned upward when the coil 8 is not excited. A movable contact plate 14 having movable contacts 15 fixed to both ends is integrally attached to the upper part of the movable body 12. The movable contact plate 14 is biased downward by a spring 13. Both sides of the terminal cover 20 are recessed, and a plurality of terminal portions 16 are provided on the bottom surface of the recess. This terminal portion 16 includes a fixed terminal plate 17 to which a fixed contact 18 for contacting and opening the movable contact 15 is fixed, and a fixed terminal plate 17.
The terminal screw 19 is screwed to the screw 17, and the outer conductor of the main circuit is connected to the fixed terminal plate 17 by the terminal screw 19. The fixed terminal plate 17 is fixed to the terminal cover 20.

In this electromagnetic contactor, when the coil 8 is energized, the spring 11
The movable iron core 10 is attracted to the fixed iron core 9 against the spring force of
By the suction, the movable body 12 integrated with the movable iron core 10 moves downward, and as the movable body 12 moves, the movable contact 15 fixed to the movable contact plate 14 comes into contact with the fixed contact 18.

When the coil 8 is not energized, the movable iron core 10 is separated from the fixed iron core 9 by the spring force of the spring 11, the movable body 12 moves upward, and the movable contact plate 14 moves accordingly, whereby the movable contact point is moved.
15 and the fixed contact 18 are separated. Here, the outer conductor of the main circuit is connected to the fixed terminal plate 17 by the terminal screw 16, and the main circuit is opened and closed by contact and opening of the contacts 15 and 18.

A surge absorber B shown in FIG. 2 is attached to the electromagnetic contactor X. In the following description, the electromagnetic contactor X has a three-pole structure. Surge absorber B is
The surge absorber body 2 is formed by integrally molding the three surge absorber elements 1 having any one of the configurations shown in FIG. 4 corresponding to the respective poles.
It has a structure in which 4 are installed vertically. The terminals 3 and 4 are bent downward in a substantially L-shape, and extend outward from the lower end, respectively, and are fixed pieces.
3a and 4a are formed, and insertion holes 5 are formed in these fixing pieces 3a and 4a.

As shown in FIG. 1, the surge absorber B is placed on the center upper portion of the terminal cover 20, and the fixing pieces 3a and 4a are fixed to the fixed terminal plate 17 with the terminal screws 19 and attached to the electromagnetic contactor X. To be The hanging pieces of the terminals 3 and 4 of the surge absorber B are bent according to the shape of the central portion of the terminal cover 20. According to the surge absorber B of this embodiment, the surge voltage generated by opening and closing the pair of contacts 15 and 18 inserted into each pole causes a current to flow through the surge absorbing element 1, thereby opening and closing the contacts 15 and 18. Absorb the generated surge voltage.

By integrating the surge absorbing element 1 connected to each pole of the electromagnetic contactor X in this manner, the surge absorbing element 1 can be easily attached to the electromagnetic contactor X as compared with the case where the surge absorbing element 1 is individually connected to each pole. You can Moreover, by fixing the surge absorber B to the electromagnetic contactor X by using the terminal portion 16 that connects the outer conductor of the main circuit of the electromagnetic contactor X, the surge absorber B can be firmly fixed to the electromagnetic contactor X.
It is possible to reduce the risk that the surge absorber B is affected by vibration or shock when the contacts of the electromagnetic contactor X are opened or closed. Further, attach the surge absorber B to the electromagnetic contactor X by attaching the terminal screw of the terminal portion 16.
Since 19 is used, there is also an advantage that a mounting tool is not required for mounting the surge absorber B. Moreover,
Since the surge absorber B is attached so as not to interfere with the connection of the outer conductor to the terminal portion 16, it does not affect the connection of the outer conductor to the terminal portion 16. That is, since the hanging parts of the terminals 3 and 4 are located on the side opposite to the side connecting the external conductor to the terminal portion 16, that is, inside the terminal portion 16, the surge absorber B
Even as a structure to fix the terminal part 16 with the outer conductor,
The surge absorber B does not interfere when connecting the outer conductor to the terminal portion 16.

[Advantages of the Invention] As described above, the present invention is an electromagnetic contactor that opens and closes each pole of a power supply line by contact and separation of two sets of contacts. An arc generated by opening and closing the contacts of each pole, with a plurality of terminal parts each including a fixed terminal board connected to two fixed contacts and a terminal screw for screwing the outer conductor of the main circuit to each fixed terminal board. Surge absorber that is formed by integrating a plurality of surge absorbers that absorb energy, and a plurality of terminals that are connected to both ends of each surge absorber and that are connected vertically from both sides of the surge absorber body. The surge absorber was attached to the upper part by fastening the fixing piece extending outward from the lower end of each terminal of this surge absorber to the fixed contact plate with the terminal screw of each terminal part. Connected to each pole of the electromagnetic contactor. Since the surge absorbing element is integrated, the surge absorbing element can be attached to the electromagnetic contactor more easily than if it was connected to each pole individually, and the surge absorber is a conductor of the main circuit of the electromagnetic contactor. The surge absorber can be firmly fixed to the electromagnetic contactor because it is fixed by using the terminal part that connects the In addition, since the surge absorber is attached to the electromagnetic contactor using the terminal screw of the terminal part, there is also the advantage that no separate fixture is required to attach the surge absorber. When connecting the external conductor to the terminal part, it is installed in a way that does not interfere, so even if the surge absorber is fixed to the terminal part together with the external conductor, it will affect the connection of the external conductor to the terminal part. There.

[Brief description of drawings]

FIG. 1 is a sectional view of an embodiment of the present invention, FIG. 2 (a),
(B) is a perspective view of a surge absorber, and a circuit diagram showing the internal structure thereof. Fig. 3 is a perspective view of a conventional surge absorber, and Figs. 4 (a) to (c) are conventional surge absorbers. It is a circuit diagram which shows an internal structure. X is an electromagnetic contactor, B is a surge absorber, 1 is a surge absorbing element, 2 is a surge absorber body, 3 and 4 are terminals, 16 is a terminal portion, 1
7 is a fixed terminal board and 19 is a terminal screw.

Claims (1)

[Scope of utility model registration request] 1. An electromagnetic contactor for opening and closing each pole of a power supply line by contacting and opening two sets of contacts, each pole being provided on both upper sides and connected respectively to two fixed contacts of each pole. A plurality of surge absorbing elements for absorbing an arc generated by opening and closing contacts of each pole, and a plurality of terminal portions each including a fixed terminal plate and a terminal screw for screwing the outer conductor of the main circuit to each fixed terminal plate. A surge absorber body formed by integrating
The surge absorber is equipped with a surge absorber consisting of a plurality of terminals connected to both ends of each surge absorber and extending from both sides of the surge absorber body, and extended outward from the lower end of each terminal of this surge absorber. An electromagnetic contactor characterized in that the fixed piece is fixed to a fixed contact plate with a terminal screw of each terminal portion and a surge absorber is attached to the upper part.