JPH05128959A - Connection unit of thermal relay - Google Patents

Abstract

PURPOSE:To make connection of an electromagnetic contactor and a thermal relay easy even when the mutual pitches of the connection parts are not in harmony. CONSTITUTION:A connection unit 15 which makes it possible to sufficiently adjust the mutual pitches of a terminal plate 18 in electric power source side for an electromagnetic contactor is composed and when the mutual pitches of the connecting parts of a thermal relay 6 and the electromagnetic contactor are different, the connection unit 15 is connected to the electric power source side of the thermal relay 6. Consequently, without processing the terminal of the thermal relay 6 in electric power source side or connecting a lead wire additionally, the thermal relay 6 can be set in the electromagnetic contactor by one touch.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a connection unit for connecting a bimetal type thermal relay (thermal dynamic overload relay) to an electromagnetic contactor.

[0002]

2. Description of the Related Art An electromagnetic contactor is usually combined with a thermal relay to form an electromagnetic switch. 5 to 7 show the general structure thereof, FIG. 5 is a perspective view of an electromagnetic contactor, FIG. 6 is a thermal relay combined therewith, and FIG. 7 is a perspective view of an electromagnetic switch in which both are combined. As is well known, the electromagnetic contactor 1 has a contact part and an electromagnet part housed in a molded case composed of an upper case 2 and a lower case 3, and a power supply side terminal 4 and a load side terminal 5 are provided in front of and behind the upper case 2, respectively. It is provided.

Further, the thermal relay 6 includes a heating portion for bending and displacing the bimetal in a case 7 made of mold resin, and an operation portion for switching a contact when the displacement amount of the bimetal exceeds a specified value. A power supply side connection plate 8 and a load side terminal 9 are provided. The connection plate 8 of the thermal relay 6 is fastened to the load side terminal 5 of the electromagnetic contactor 1 with the terminal screw 10, and is assembled as shown in FIG. The lower part of the thermal relay 6 is coupled to the electromagnetic contactor 1 via a claw (not shown) of the case 7.

[0004]

By the way, in such a combination of the electromagnetic contactor 1 and the thermal relay 6, the interphase pitch (x in FIG. 5) of the load-side terminals 5 of the electromagnetic contactor 1 and the connection to it. The interphase pitch (y in FIG. 6) of the power source side connection plate 8 of the thermal relay 6 may not match (for example, x <y). This is because the outer dimensions of the electromagnetic contactor 1 differ depending on whether the resin used for the cases 2 and 3 is thermosetting or thermoplastic (generally, thermosetting resin has excellent arc resistance). However, the mechanical strength is smaller than that of the thermoplastic resin, so it is necessary to increase the wall thickness, and the electromagnetic contactor using the thermosetting resin has a larger interphase pitch than the one using the thermoplastic resin).

In such a case, conventionally, as a first countermeasure, as shown in FIG. 8, the shape of the R-phase and T-phase connecting plate 8 of the thermal relay 6 is changed so that the interphase pitch becomes x = y '(<y. )
I was trying to become. Next, as the second measure,
As shown in FIG. 9, the tip of the connecting plate 8 was cut, and then the lead wire 12 having the crimp terminal 11 attached thereto was connected by resistance welding or the like. Needless to say, the lead wire 12 is flexible and can cope with an arbitrary interphase pitch. Furthermore, as the third countermeasure, the single installation unit 1 shown in FIG.
3, the thermal relay 6 is combined with the thermal relay 6 as shown in FIG. 11 and installed in the panel, and then the power supply side terminal 14 of the single installation unit 13 and the load side terminal 5 of the electromagnetic contactor 1 are again connected by lead wires. I was connected.

However, the above-mentioned first and second measures have a problem that it takes time and effort because the thermal relay 6 must be modified. In addition, the third measure has a problem that a space is required to separately install the single installation unit 13. In any case, the thermal relay 6 cannot be easily combined with the electromagnetic contactor 1, which is troublesome. Therefore, an object of the present invention is to provide a thermal relay connection unit in which a thermal relay can be easily combined with an electromagnetic contactor even if the interphase pitches do not match.

[0007]

In order to achieve the above object, the present invention allows a power source side connection plate of the thermal relay to be held in front of and behind a case made of a mold resin that is detachable from the thermal relay. The clip terminal and the connection plate connected to the load side terminal of the electromagnetic contactor are attached to form a unit, and the phase pitch of the connection plate connected to the electromagnetic contactor is adjustable, and the connection plate and the clip It shall be connected to the terminal by a flexible lead wire.

[0008]

The difference in the inter-phase pitch between the electromagnetic contactor and the thermal relay can be easily eliminated by inserting the connection unit having the adjustable inter-phase pitch between the electromagnetic contactor and the thermal relay.

[0009]

Embodiments of the present invention will be described below with reference to FIGS. Here, FIG. 1 is a vertical cross-sectional view of the connection unit, FIG. 2 is a plan view of the connection unit cut along a line II-II, FIG. 3 is a perspective view of the connection unit, and FIG. It is a perspective view of the mounted state.
In these figures, the connection unit 15 includes a clip terminal 17 for gripping the power source side connection plate (8 in FIG. 6) of the thermal relay 6 and a load side terminal of the electromagnetic contactor (FIG. No. 5) and the connection plate 18 connected thereto are respectively attached to form a unitized structure.

A pair of left and right arms 16a holding the thermal relay 6 from both sides are integrally formed in the case 16, and the connection unit 15 has an elastic engagement between the square hole 19 of the arm 16a and the claws 20 on both side surfaces of the thermal relay 6. According to the combination, the thermal relay 6 is detachably mounted as shown in FIG. The clip terminal 17 grips the connection plate 8 of the thermal relay 6 inserted in the direction of arrow A in FIG. 1 when the connection unit 15 is attached to the thermal relay 6, and is electrically connected to this.

The connecting plate 18 is fastened to the case 16 by a screw 21 and a nut 22 which penetrate the connecting plate 18,
The through hole 23 of the screw 21 and the hole 24 through which the connecting plate 18 penetrates the case 16 are elongated holes in the interphase direction as shown in FIG. 2, and the connecting plate 18 of the R phase and the T phase has the through hole 23 and the screw 2.
The inter-phase pitch can be changed with respect to the S-phase (central phase) connecting plate within a margin between the two. The clip terminal 17 is fixed to the case 16, and the clip terminal 17 and the connection plate 18 are connected by a flexible lead wire 25.

If the interphase pitch of the connection plate 8 of the thermal relay 6 is different from that of the electromagnetic contactor, the connection unit 1
5 is attached to the thermal relay 6 as shown in FIG. 4, the screw 21 is loosened, the connecting plate 18 is moved in the direction of arrow B in FIG. 2, and the interphase pitch y ′ is adjusted to the electromagnetic contactor. After that, connect the connecting plate 18 to the load side terminal of the electromagnetic contactor (5 in FIG. 5).
Tighten with terminal screw 10.

[0013]

As described above, according to the present invention, the electromagnetic contactor can be adjusted by adjusting the interphase pitch of the connection plates on the power source side of the connection unit detachably attached to the thermal relay. The electromagnetic contactor and the thermal relay can be easily combined without requiring complicated processing and a large space even when the phase pitch of the connection portion between the and the thermal relay does not match.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a connection unit showing an embodiment of the present invention.

FIG. 2 is a plan view of FIG. 1 with a part cut away along the line II-II.

FIG. 3 is a perspective view of the connection unit of FIG.

4 is a perspective view of a state in which the connection unit of FIG. 1 and a thermal relay are combined.

FIG. 5 is a perspective view showing a general configuration of an electromagnetic contactor.

FIG. 6 is a perspective view showing a general configuration of a thermal relay.

7 is a perspective view of the electromagnetic contactor of FIG. 5 combined with the thermal relay of FIG.

FIG. 8 is a perspective view of a conventional thermal relay.

FIG. 9 is a perspective view of another conventional thermal relay.

FIG. 10 is a perspective view showing a general configuration of a single unit of a thermal relay.

11 is a perspective view of the single installation unit of FIG. 10 combined with the thermal relay of FIG.

[Explanation of symbols]

 1 Electromagnetic contactor 6 Thermal relay 8 Connection plate 15 Connection unit 16 Case 17 Clip terminal 18 Connection plate 25 Lead wire

Claims (1)

[Claims] 1. A clip terminal for gripping a power source side connection plate of the thermal relay and a connection plate connected to a load side terminal of an electromagnetic contactor before and after a case made of a mold resin detachably attached to the thermal relay. Characterized in that the connection plate and the clip terminal are connected to each other by a flexible lead wire as well as being configured as a unit by adjusting the interphase pitch of the connection plate connected to the electromagnetic contactor. A connection unit for the thermal relay.