JP2643674B2 - Electromagnetic contactor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic contactor for controlling the turning on and off of an electric circuit by opening and closing a contact.

[0002]

2. Description of the Related Art FIG. 3 is a cross-sectional view showing the structure of a conventional electromagnetic contactor, FIG. 4 is a side view of an internal part which models the acting force of the electromagnetic contactor, and FIG. FIG. 4 is a cross-sectional view illustrating an example of a movable unit that performs unstable sliding of the movable unit.

[0003] In the figure, reference numeral 101 designates a framework of a movable part.
It is a crossbar that slides right and left in the figure. Movable contact 10
2 is incorporated in the crossbar 101. The movable contact 102 has movable contacts at both ends thereof, and opens and closes current by contacting and separating with a fixed contact (not shown) facing the movable contact 102.

A pressing spring 103 is provided between the crossbar 101 and the movable contact 102 so as to apply pressure to the movable contact 102 to generate a contact pressure. The crossbar 10 is composed of a movable core, a fixed core, a coil, and the like.
1 is provided with an electromagnet 4 for giving a driving force. Also,
A cover 105 for slidably housing the crossbar 101 and holding fixed contacts and terminals (not shown) is provided. The cover 105 is combined with the case 6 that houses the electromagnet 4.

The movable part including the crossbar 101 and the electromagnet 1
04 is insulated by an insulating plate. Also,
A coil-shaped trip spring 108 is provided to apply a reaction force to the crossbar 101 against the driving force of the electromagnet 4.

Reference numeral 109 denotes a driving force generated by the electromagnet 4 and transmitted to the crossbar 101 via the link.
Reference numeral 10 denotes a reaction force applied to the crossbar 101 by the tripping spring 108, and reference numeral 111 denotes a reaction force received by the movable contact 102 from the movable contact 102 when the contact is closed by the pressing spring 103.

In the conventional electromagnetic contactor configured as described above, when the electromagnet 4 is excited, the driving force 109 from the electromagnet 4 is increased.
As a result, the crossbar 101 slides leftward in FIG.
Until the closing operation is completed, the pressing spring 103 and the releasing spring 108 are further compressed from the initial state. Then, a corresponding reaction force 110 or reaction force 111 is applied to each portion of the crossbar 101. In this state, the driving force 109 for releasing the excitation disappears, and the crossbar 101 moves as shown in FIG.
To the right and return to the original position.

When the movable part is assembled into the cover 105, the tripping spring 108 is temporarily fixed by inserting its end into the upper projection of the crossbar 101. Pushed into. The space between the trip spring 108 and the cover 105 is held by the reaction force 110 of the trip spring 108. However, as shown in FIG. 5, the tripping spring 108 may jump out to the sliding surface of the crossbar 101 due to insufficient pushing during assembly or misalignment due to repetition. At this time, there was a risk that the crossbar 101 would be restrained between the tripping spring 108 and the insulating plate 107.

The force acting on the crossbar 101 is as follows:
The size is balanced with respect to the sliding direction. However, since the position where the reaction force 110 is received is above the crossbar 101 and deviates from the line of action of the driving force 109 and the reaction force 111, a rotational moment in the sliding direction is generated, and Empower. For this reason, on the sliding surface between the crossbar 101, the cover 105, and the insulating plate 7, the compressive force due to the rotational force acts to increase the frictional force. As a result, a large driving force 109 is required at the time of closing.

FIG. 6 is a sectional view of a conventional electromagnetic contactor disclosed in Japanese Patent Application Laid-Open No. 58-140940. In this electromagnetic contactor, each of the electromagnet 4, the crossbar 101, the movable contact 102, the pressing spring 103, and the tripping spring 108 is arranged in the longitudinal direction. As a result, the forces acting on the crossbar 101 are made to coincide on the same line of action.

However, unlike the electromagnetic contactor in which the sliding of the crossbar 101 and the sliding of the electromagnet 4 are separated as shown in FIG. Then all the parts are lined up vertically. For this reason, the external dimensions in the vertical direction are large, and this is not suitable for an electromagnetic contactor that requires miniaturization.

On the other hand, the electromagnetic contactor shown in FIG. 3 has been successfully reduced in size as compared with the electromagnetic contactor shown in FIG. 6, but requires a space for accommodating the trip spring 108, and the crossbar 101
And the cover 105 is large only by the storage space of the trip spring 108.

[0013]

That is, since the electromagnetic contactor shown in FIG. 3 is constructed as described above, one end of the trip spring 108 must be a free end in terms of assembly as shown in FIG. . For this reason, there has been a problem that the displacement of the trip spring 108 hinders the sliding of the crossbar 101.

As shown in FIG. 4, the crossbar-1 depends on the positional relationship between the driving force 109, the reaction force 110, and the reaction force 111.
Since a rotational force is applied to the motor 01, there is a problem that the frictional force is increased during sliding.

The present invention has been made in view of the above, and has as its object to provide a small-sized and stable operation electromagnetic contactor.

[0016]

SUMMARY OF THE INVENTION According to the present invention, a plurality of movable contacts arranged substantially in parallel are supported, the movable contacts are supported via a pressing spring, and a direction in which the movable contacts are arranged. A crossbar that slides along the crossbar, an electromagnet that is installed substantially parallel to the crossbar, is connected to the crossbar via a link mechanism, and applies a driving force to the crossbar, and is provided to the crossbar. In an electromagnetic contactor having a trip spring provided against a driving force, a trip spring is disposed at an end opposite to an end receiving a driving force of a crossbar, and the trip spring is provided. And the position where the crossbar receives the driving force and the position of the pressing spring are set on a straight line along the sliding direction of the crossbar, and the tripping spring is a conical spring. It is an electromagnetic contactor.

[0017]

According to the electromagnetic contactor of the present invention, the trip spring is arranged on the same line as other forces acting on the crossbar. Therefore, the forces are balanced in directions other than the sliding direction, and the crossbar slides with minimum friction. Further, since the trip spring is a conical spring, the area of the spring seat becomes large, and the trip spring and the cover can maintain a stable positional relationship.

[0018]

Embodiments of the present invention will be described below with reference to the drawings. Embodiment 1 FIG. 1 is a sectional view showing an electromagnetic contactor according to an embodiment of the present invention, and FIG. 2 is a side view of an internal component that models the acting force of the electromagnetic contactor.

In FIG. 1, reference numeral 1 denotes a crossbar which forms a framework of a movable portion and has a spring seat projection at its tip. Crossbar-1
Is mounted with a movable contact 2 for actually opening and closing the current. A press spring 3 for applying pressure to the movable contact 2 is provided between the crossbar 1 and the movable contact 2.

The crossbar 1 is provided with a driving force by an electromagnet 4. The crossbar 1 is housed in a cover 5. Cover 5 is combined with the case 6 accommodating the electric magnet 4. The movable portion including the crossbar 1 and the electromagnet 4 are insulated by an insulating plate 7. A conical spring is attached to the tip of the crossbar 1 so as to be able to expand and contract within a small space between the crossbar 1 and the cover 5. The conical spring is a trip spring 8 that applies a reaction force to the crossbar 1.

Reference numeral 9 denotes a driving force of the electromagnet 4, 10 denotes a reaction force of the tripping spring 8, and 11 denotes a reaction force of the movable contact 2 by the pressing spring 3.

In the electromagnetic contactor thus configured, the space between the crossbar-1 and the cover-5 is effectively used. That is, the tripping spring 8 can be contracted to the plane unique to the conical spring when the crossbar 1 slides left and right.

At this time, the tripping spring 8 is housed in a space closed by the cover 5 and the insulating plate 7, so that the diameter of the spring on the cover side can be increased. Therefore, the trip spring 8 is positioned with a small amount of backlash, and does not come into contact with the cover 5 or the sliding surface of the insulating plate 7 during expansion and contraction. As a result, the load can be extremely stabilized.

As shown in FIG. 2, the driving force 9 of the electromagnet 4, the reaction force of the trip spring 1, and the reaction force 11 of the pressing spring are aligned on the same line, and the force acting on the crossbar -1 is in the sliding direction. Other than that. For this reason, the rotation mode
No friction occurs, and an increase in frictional force due to a so-called twisting phenomenon can be prevented.

[0025]

As described above, according to the electromagnetic contactor of the present invention, the trip spring is disposed at one end of the crossbar, and the force acting on the other crossbar and the reaction force of the trip spring are the same. It can work on a line. Thus, the crossbar can perform stable sliding. Further, since the tripping spring is a conical spring, the movement of the tripping spring is prevented from hindering the sliding, and the space in the crossbar sliding direction is provided without providing a separate installation space for the tripping spring. Since the processing can be performed in a metal contactor, a remarkable effect such as a reduction in the outer dimensions of the electromagnetic contactor can be achieved.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an electromagnetic contactor according to one embodiment of the present invention.

FIG. 2 is a side view of an internal component that models the acting force in the embodiment.

FIG. 3 is a cross-sectional view illustrating a conventional electromagnetic contactor.

FIG. 4 is a side view of an internal component that models the acting force in the electromagnetic contactor of FIG. 3;

FIG. 5 is a cross-sectional view showing a movable portion that performs unstable sliding in the electromagnetic contactor of FIG. 3;

FIG. 6 is a sectional view of a conventional electromagnetic contactor disclosed in Japanese Patent Application Laid-Open No. 58-140940.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 crossbar 2 movable contact 3 press spring 4 electromagnet 5 cover 6 case 7 insulating plate 8 tripping spring 9 drive force 10 reaction force 11 reaction force of push spring 101 crossbar 102 movable contact 103 press spring 105 cover −107 Insulating plate 108 Trip spring 109 Driving force 110 Reaction force 111 Reaction force of compression spring

Claims (1)

(57) [Claims] A plurality of movable contacts arranged substantially parallel to each other and supporting the movable contacts via a pressing spring;
A crossbar that slides along the direction in which the movable contacts are arranged.
An electromagnet installed substantially parallel to the crossbar, connected to the crossbar via a link mechanism, and applying a driving force to the crossbar; and an electromagnet provided against the driving force applied to the crossbar. An electromagnetic contactor having a trip spring, wherein a trip spring is disposed at an end opposite to the end receiving the driving force of the crossbar, and the position of the trip spring is
A position where the driving force is received by the crossbar and a position of the pressing spring are respectively set on a straight line along a sliding direction of the crossbar, and the tripping spring is a conical spring. Contactor.