JPS6228534B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a hinge-type electromagnetic contactor, which is capable of reducing the size of an electromagnetic device and providing stable operation.

The electromagnet for operation of a magnetic contactor is generally 10 to 1000
It is required to be able to ensure stable operation during repeated operations 10,000 times, and to be low-cost and compact. Therefore, electromagnetic contactors having structures that meet this requirement have been manufactured. By the way, the general structure of a conventional electromagnetic contactor is that the hinge part of the movable iron piece supported by the yoke is extended to form a protruding piece, and a tension spring is interposed between the protruding piece and the yoke to The spring provides a restoring force to the movable iron piece and also obtains a force to press the hinge portion against the yoke.

However, the conventional electromagnetic contactor having such a structure requires a space for arranging the tension spring, and has the disadvantage that the electromagnet becomes large in size. In addition, in this structure, the load on the tension spring increases with the movement of the movable iron piece, so an electromagnet with sufficient adsorption force is required, which has the disadvantage of preventing the miniaturization of the electromagnet. Ta.

The present invention eliminates these drawbacks and provides a hinge-type electromagnetic contactor that is smaller and has a built-in operating electromagnet that is highly reliable against repeated opening and closing operations.

One embodiment of the present invention will be described with reference to FIGS. 1 and 2. Reference numeral 1 denotes a frame made of synthetic resin, which houses all of the following fixed contacts, movable contacts, electromagnets, etc. This frame 1
A plurality of fixed contacts 2 are attached at regular intervals on the upper part of the contact plate 2, and a movable contact 5 attached to a support plate 3 via a contact spring 4 is located between them. The support plate 3 is provided with a projection 3a, and a return spring 6 is interposed between the projection 3a and the inner wall 1a of the frame 1. The support plate 3 is also provided with a protrusion 3b on the lower side, and the tip of a push rod 7, which will be described later, comes into contact with the protrusion 3b.

The inside of the frame 1 is partitioned by an insulating plate 8, and a fixed core 9, a coil 10 wound around the outer periphery of the fixed core 9, and a coil 10 are arranged at the bottom of the frame 1.
Specifically, an electromagnet 13 is housed, which is comprised of a substantially L-shaped yoke 12 that supports a spool 17, which is a coil winding frame, via a wire spring 11. That is, the wire spring 11 presses and supports the yoke 12 against one case wall on the one hand, and the spool 17 against the other case wall on the other hand. 14 is the case back.

The yoke 12 is provided with a hole 12a having a width D, and the base end of an armature 15 made of a plate is inserted into the hole 12a and is rotatably supported. The armature 15 has a shape as shown in FIG. 3, and the protrusion 15a at the lower end fits into the hole 12a of the yoke 12. A projection 15b is formed approximately at the center of this armature 15, and this portion receives the lower end of a compression spring 16, which will be described later.

A stopper 15c consisting of a protrusion is formed on the outer surface of the armature 15. This stopper 15
c indicates the inner wall 1 of the frame 1 when the movable contact 5 is not in contact with the fixed contact 2 as shown in FIG.
It is now in contact with b. The tip 15d of the armature 15 is formed in a shape that gradually becomes thinner as shown in FIGS. 3 and 4, and is reduced by a distance S from the frame 1 as shown in FIG. I'm starting to be able to do it a little bit. This tip 1
5d is in contact with the base end of the push rod 7, as shown in FIG.

Note that the tip 15d of this armature 15 is the fifth
As shown in the figure, the plate may be formed to have the same thickness as the base side.

As shown in FIG.
A compression spring 16 is interposed diagonally between the armature 15a and the protrusion 15b of the armature 15. FIG. 5 shows the dimensional relationship and force relationship between the armature 15 and the compression spring 16. That is, the distance from the tip of the armature 15 to the stopper 15c is L, the distance from this stopper 15c to the upper surface of the yoke 12 is M, and the inclination angle of the armature 15 is θ ₁
It is.

Since the compression spring 16 is installed diagonally, the compression spring 16 is attached to the armature 1.
The force Pa exerted on 5 can be divided into two directional forces Pax and Pay. The distance between the direction of this force Pax and the protrusion 15c is N, and the angle between the forces Pa and Pay is θ ₂ . Pc is the force that pushes the tip of the armature 15 to the right in the figure, and P _L is the force that pushes the base end of the armature 15 to the left within the hole 12a of the yoke 12.

Next, the operation of this electromagnetic contactor configured in this way will be explained. When the coil 10 is energized and energized, the armature 15 rotates counterclockwise within the range of angle θ ₁ and pushes the protrusion 3b of the support plate 3 via the push rod 7, so that the support plate 3 It will move in the direction P in Figure 1. As a result, the movable contact 5 comes into contact with the fixed contact 2.

In this case, the load force of the return spring 6 and the contact spring 4 is transmitted to the tip 15d of the armature 15 via the push rod 7. FIG. 6 shows this change, with the horizontal axis representing the stroke (mm) at the tip of the armature 15 and the vertical axis representing the load (Kg). In this figure, A on the horizontal axis indicates the release position, B indicates the contact contact start position, and O indicates the suction completion position. Also, a is the characteristic of the compression spring 16,
b is the characteristic of the return spring 6, c is the characteristic when the contact spring 4 is extended, and d is the characteristic of the contact spring 4.
e is the characteristic of each process during compression of these a, b,
It shows the combined load characteristics of c and d, and f shows the suction force.

The force P _L pushing the lower end (hinge portion) of the armature 15 to the left is as follows (see Fig. 5).

P _L1 = N/M x Pa x = N/M x Pa sinθ P _L2 = L/M x Pc P _L = P _L1 + P _L2 Also, the force that presses the lower end of armature 15 against yoke 12 is Pay = Pa cos θ. expressed.

Since this invention is configured as described above, it has the following effects.

In relation to the arrangement of the compression springs, it is possible to achieve a smaller size than the conventional one.

A part of the force generated by interposing the compression spring in the diagonal direction acts as a force that effectively presses the base of the armature against the yoke, thereby improving the flow of magnetic flux.

Since all the loads applied to the armature are pressed against the yoke using the stopper as a fulcrum, the armature does not become unstable, and therefore its action is stabilized.

In relation to the installation angle of the compression spring, even if the load P ₀ (see Figure 6), which is important for determining the shock malfunction resistance when the movable contact opens, is increased, the load P ₁ at the point that determines the suction characteristics will decrease. Since it does not become large in comparison, the electromagnet can be made smaller.

It should be noted that if the tip portion, which is not affected by the magnetic flux density of the armature, is made thin as in the embodiment of the present invention, the smaller the tip, the more useful it will be for downsizing.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal cross-sectional view of one embodiment of the present invention;
The figure is a view taken from the - direction arrow in Figure 1, Figure 3 is a perspective view of the armature, Figure 4 is an explanatory diagram showing the mounting part of the armature, and Figure 5 shows the distance between the armature and the compression spring and the direction of force. The explanatory diagram, FIG. 6, is a graph showing the operating characteristics. 1: Frame, 2: Fixed contact, 3: Support plate,
4: Contact spring, 5: Movable contact, 6: Return spring, 7: Push rod, 13: Electromagnet, 15: Armature, 15c: Stopper, 16: Compression spring, 1
7: Spool.

Claims (1)

[Claims] 1. A spool wound with a coil is attached to a fixed core attached to a yoke, and when the coil is energized, the armature whose base end is supported by the yoke is attracted to the fixed core side, and the armature is attached to the fixed core. In a hinge type electromagnetic contactor in which a movable contact is moved toward a fixed contact via an associated push rod, a stopper consisting of a protrusion is formed on the outer surface of the armature, and the stopper is brought into contact with the frame, and A diagonally directed compression spring is interposed between the opposite side of the armature and the corner of the spool, the compression spring presses the base end of the armature against the yoke, and the stopper is fixed to the frame. A hinged electromagnetic contactor characterized in that it is configured to obtain a pressing force. 2. A hinged electromagnetic contactor, characterized in that the armature according to claim 1 has a thin tip.