JPH048599Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention is an improved armature support mechanism in a relay.

An example of a conventional relay is shown in FIGS. 1 to 3.

The yoke 1 is formed into a substantially E-shape with three iron core parts 1a to 1c standing upright, and the central iron core part 1b
An electromagnetic coil 20 is wound around it to constitute an electromagnet.
When the yoke 1 is magnetized, the armature 2 is attracted by the electromagnetic force.
The two end portions located at a and 1c are pressed toward the yoke 1 by the presser portion 4a of the presser spring 4, which is held between the yoke 1 and the presser block 3 and has one end fixed, and the end portions are held as fulcrums. The U-shaped portion 4b of the presser spring 4 is fitted into the hole 5 to prevent vertical movement. In FIG. 2, one of the presser springs 4 is shown in a partially broken state.

On the other hand, in a direction opposite to the armature 2 with respect to the yoke 1, a pair of movable contacts 6a, 6b and a fixed contact 7 connected to an electric circuit (not shown) are arranged in a direction parallel to the direction in which the iron core portions of the yoke 1 are arranged. A plurality of pairs of movable contacts 6a and 6b are arranged, and each fixed contact 7
The movable contacts 6a are arranged on the yoke side, and the movable contacts 6b are arranged on the opposite side of the yoke, with the fixed contact 7 in between. Furthermore, the movable contacts 6a and 6b are
One end engages with the two projections 2a of the armature 2, and the other end is linked to a card 8 supported by a load spring 10. The load spring 10 always elastically biases the armature 2 in a direction away from the yoke 1 via the card 8. Further, the fixed contact 7 is fixed by a support plate 9 that is fitted and fixed to the yoke 1 and also serves as a backstop for the armature 2.

In this relay, each movable contact 6a, 6
With the spring force of b and the elastic force of the load spring 10, all the back side movable contacts 6b located on the opposite side of the yoke come into contact with the corresponding fixed contacts 7, and these contacts 6b,
7 is closed. From this state, when the electromagnetic coil 20 is energized, the yoke 1
The upper ends of the iron core parts 1a to 1c serve as magnetic poles, and the armature 2 is suction-adhered against the elastic force of the movable contacts 6a, 6b and the load spring 10, and as the card 8 moves, the movable contacts 6b and each corresponding fixed contact 7
At the same time, the front side movable contact 6a located on the yoke side is brought into contact with the fixed contact 7, and an electric circuit of a different system than the above connected to these is closed.

When the power to the electromagnetic coil 20 is cut off, the movable contacts 6a, 6b, the load spring 10, the card 8, the armature 2, etc. return to their previous positions due to the elastic restoring force of the movable contacts 6a, 6b and the load spring 10. Then, the original electric circuit is closed again.

However, in the conventional relay having such a configuration, among all the movable contacts 6a arranged parallel to the direction in which the iron core parts of the yoke 1 are arranged, only the movable contacts 6a located on one of the iron core parts are welded, for example. If the movable contact 6a becomes unable to be disconnected from the fixed contact 7 due to locking, etc., and the electromagnetic coil 20 is de-energized, the movable contact 6a, which has become inseparable, cannot return to its previous position, whereas the other side The normal movable contact a side located on the iron core side is the movable contact 6a, 6
b and the elastic restoring force of the load spring 10 make it possible to move toward the old side. For this reason, a torsional moment centered on the vertical direction in the figure due to the elastic restoring force acts on the armature 2, causing the armature 2 to be twisted, and the presser spring 4 cannot overcome this torsional moment. , one of the fulcrums of the armature 2 lifts up. As a result, even though the front side movable contact 6a and the fixed contact 7 are in a closed state, there is a possibility that the back side movable contact 6b and the fixed contact 7 may be closed on the other hand.

It should be noted that if the spring force of the presser spring 4 is increased or if a rigid member is used to support the armature 2, the movable contact 6b and the fixed contact 7 will be closed due to the generation of the torsional moment. Although the problem is eliminated, the load on the normal operation of the armature 2 increases, and there is a possibility that the smooth operation of the armature 2 will be hindered. If a play is created between the armature and the armature 2 in order to reduce the load, the fulcrum of the armature 2 will float from the beginning, which is undesirable for the magnetic circuit.

The present invention was developed in view of the above points, and prevents the lifting of the end of the armature on the fulcrum side without deteriorating the operating characteristics of the relay due to the use of a rigid body or a presser spring with strong spring force. By providing a stopper with such rigidity, the above-mentioned conventional disadvantages can be solved.

An embodiment of the present invention will be described below with reference to FIGS. 4 and 5. Incidentally, the same elements as those in the conventional example are given the same reference numerals, and the explanation thereof will be omitted.

Rigid stoppers 11 as shown in FIG. 4 are provided on the support end side of the armature 2, which is constructed in the same manner as in the prior art, and serves as a pivot point. One end of each stopper 11 has a U-shaped portion 1 that fits into the hole 5 of the armature 2 to prevent vertical movement.
2a, the lower ends of the iron cores 1a and 1c on both sides of the yoke 1 and the presser block 3.
It is clamped and fixed by. The other end of the stopper faces the support end of the armature 2 with a predetermined gap therebetween. In addition, in FIG. 4, one of the presser springs 12 is shown in a partially broken state as in FIG. 2. The gap formed between the stopper 11 and the armature 2 allows the rotation of the fulcrum side end of the armature 2 during normal operation, which is necessary for the opening and closing operations of the movable contacts 6a, 6b and the fixed contact 7. If the recovery condition is such that the power to the electromagnetic coil is cut off when the movable contact 6a and the fixed contact 7 are welded together and cannot be separated, the torsional moment acting on the armature 2 causes the armature 2 to The movable contact 6b and the fixed contact 7 are set to such an extent that even if the fulcrum side end of the yoke 1 rises up from the yoke 1 and contacts the stopper 11, the movable contact 6b and the fixed contact 7 do not close. That is, armature 2
is in contact with the yoke 1 and stands upright (movable contact 6
a is connected to the fixed contact 7), the distance between the armature 2 and the stopper 11 is set to be shorter than the distance between the movable contact 6b and the fixed contact 7.

Next, the effect will be explained.

The opening/closing operations of the movable contacts 6a, 6b and the fixed contact 7 during normal operation are the same as in the past, so they will be omitted.The operation when the movable contact 6a and the fixed contact 7 cannot be separated due to welding, locking, etc. will be omitted. Explain.

When the electromagnetic coil is energized, the armature 2 is attracted, the movable contact 6a and the fixed contact 7 are closed, welded,
If the connection between one movable contact 6a and the fixed contact 7 cannot be disconnected due to locking, etc., and the power to the electromagnetic coil is cut off, the contact 6
a, 6b, due to the elastic restoring force of the load spring 10, a torsional moment about the vertical direction in the figure acts on the armature 2, and the other side of the armature 2 (the side where the movable contact 6a and the fixed contact 7 are not fixed) ) floats up and comes into contact with the stopper 11 and stops. This stopper 11
The floating distance (gap) up to the movable contact 6b
Since the distance between the armature 2 and the fixed contact 7 is set shorter than the distance between the armature 2 and the fixed contact 7, the stopper 11 stops the movement of the armature 2 due to lifting before the movable contact 6b comes into contact with the fixed contact 7, and the fixed contact 7 and the movable contact 6b are Contact can be prevented.

Even if welding or locking of the contacts occurs in this way, simply providing the stopper 11 will prevent the front movable contact 6a and the fixed contact 7 from closing at the same time, as well as the fixed contact 7 and the back movable contact 6b. It is possible to prevent electrical runaway, etc. with an inexpensive configuration.

In the above embodiment, since the fulcrum side end of the armature 2 is located in the gap between the stopper 11 and the yoke 1, the presser spring 12 is provided with a presser portion of the conventional presser spring 4. However, if it is necessary to further improve the stability at the fulcrum part of the armature 2, a presser foot formed with a presser part as in the past may be used. You can use a spring.

As explained above, according to the present invention, a rigid stopper is provided to prevent the end of the armature on the fulcrum side from lifting up, so that one side cannot be separated due to welding, locking, etc. on the movable contact side on the front side. Even if a command is issued to switch the connection to the back side movable contact in this state, it is possible to prevent the contact from closing on the back side movable contact.

Thereby, electrical runaway caused by welding, locking, etc. of contacts can be prevented with an inexpensive configuration.

[Brief explanation of drawings]

Figure 1 is a schematic front view of a conventional relay, Figure 2 is a perspective view of the main parts of the conventional relay, Figure 3 is an enlarged view of the main parts of the same, and Figure 4 is an embodiment of the present invention. FIG. 5 is a perspective view of the main parts of the relay, and FIG. 5 is an enlarged view of the main parts of the same embodiment. DESCRIPTION OF SYMBOLS 1... Yoke, 2... Armature, 3... Presser block, 6a, 6b... Movable contact, 7... Fixed contact, 8... Card, 11... Stopper, 12...
...Press spring, 10...Load spring, 20...Electromagnetic coil.

Claims (1)

[Scope of utility model registration request] A yoke with three iron cores standing upright and formed into a substantially E-shape, with an electromagnetic coil wound around the central iron core;
It is formed in a substantially U-shape, and is located at the end core portions on both sides of the yoke, straddling the electromagnetic coil, and is freely rotatable relative to the yoke with support ends pressed against the end core portions by springs as fulcrums. A supported armature is supported by a load spring, one end of which engages with a rotating end of the armature opposite to the supporting end, and the other end of which elastically biases the armature in a direction away from the yoke. a plurality of fixed contacts arranged parallel to the direction in which the iron core portions of the yoke are lined up; and a plurality of fixed contacts arranged on the yoke side and the opposite side of the yoke with the fixed contacts in between, each of which is linked to the card. In a relay configured with a plurality of pairs of movable contacts, a rigid stopper for regulating lifting of the support end of the armature is attached to the lower end of the core on both sides of the yoke. fixing the armature, and making the other end face the supporting end of the armature pressed by the yoke with a predetermined gap therebetween, and fixing the armature in a state where the armature is in contact with the yoke due to the electromagnetic attraction force in the predetermined gap. A relay characterized by having a distance shorter than the distance between the contact and the movable contact on the opposite yoke side.