JPS5841701Y2 - relay - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a relay used, for example, in a closing control circuit for a breaker that can open and close an electric circuit.

Figures 1a and 1) show a conventional closing circuit and closing control circuit.

In the same figure, 52Y is a normally open contact 52Ya and a normally closed contact 5
A repeat prevention relay having two contacts with 2Yb, 52X an electromagnetic contactor having a contact 52 52Cb is a normally open time limit switch that is closed by the movement of a link (not shown) just before the breaker is closed, 52Cb is a normally closed time limit switch that is opened by the movement of the link just before the breaker is closed, and C8 is for breaker closing operation. The switch SR is a resistor that prevents the relay 52Y from falling off when the normally open contact 52Ya opens for a short time (chattering) due to vibration when the breaker is turned on.

From the above configuration, when switch C5 is turned on, contactor 52X
is excited, closes its contact 52Xa, and also closes its contact 52X'a, and the electromagnet 52C is excited.

This causes the breaker to start closing. Immediately before the closing operation of the breaker is completed, the contact 52Ca closes and the contact 52Cb opens in conjunction with the movement of a link (not shown).

As a result, the relay 52Y is energized, and its contacts 52
Yb is opened and the contactor 52X is de-energized, and the electromagnet 5
2 Solve the excitation of C as well.

At the same time, when the contact 52Ya is closed and the switch C3 is turned on, the relay 52Y is self-retaining and the contactor 52Y is closed.
2X and the electromagnet 52C are held in a de-energized state to prevent repeated closing of the breaker.

That is, the breaker is turned on again by once opening the switch C3 and releasing the self-holding state of the relay 52Y.

The relay 52Y used in such a control circuit requires a contactor contact 52X'a and a time switch contact 52Ca linked to a breaker in order to operate, and also requires a contact 52Ca for self-maintenance. It requires 52 Ya.

Further, there is a drawback that a resistor SR is required to prevent the contact 52 Ya from chattering due to vibration or the like when the circuit breaker is turned on.

SUMMARY OF THE INVENTION An object of the present invention is to provide a relay that eliminates the above-mentioned drawbacks, has a simplified structure, and reliably prevents chattering.

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 2 is a block diagram showing one embodiment of the relay according to the present invention, and the following description will be made using a hinge type relay as an example.

A movable core 3 is screwed to a part of a yoke 4 to an electromagnet of a fixed core 2 around which a coil 1 is wound, and a return spring 5
The structure is such that there is a large gap between the fixed iron core 2 and the fixed iron core 2 due to the tension.

This gap is selected to have a size such that even if the coil 1 is excited by applying a rated voltage, the movable iron core 3 will not be attracted by the attractive force of the electromagnet.

For example, the design is such that the movable iron core 3 is not attracted even at about 1.50% of the rated voltage of the electromagnet.

A normally closed contact 52 Yb is connected to the movable core 3 via an insulating plate 6.
A movable contact 7A of the contact 7 whose details are shown in FIG. 5 is provided, and a fixed contact 7B of the contact 7 is fixed to an insulator 9 on which a terminal 8 is attached.

The insulator 9 is fixed to a base 10 on which the electromagnet is mounted.

A plate metal fitting 11 is provided on the outer surface of the insulating plate 6, and this metal fitting 11 has a pin 12 interlocked with the closing operation of the breaker.
moves in the direction of the arrow in FIG. 2 and comes into contact with the contact plate fitting 11 when the breaker completes closing operation, and presses the movable iron core 3 to within the suction range of the electromagnet.

Next, the operation of the above embodiment will be described with reference to FIGS. 3 and 4.

FIG. 3 shows a state in which the pin 12 is in contact with the metal plate 11 and presses the movable iron core 3 toward the electromagnet.

As shown in FIG. 3, when the movable core 3 is pressed, the movable contact 7A and the fixed contact 7B of the contact 7 are separated.

When the movable core 3 is further pressed by the pin 12, the movable core 3 comes within the range of the electromagnet and is therefore held firmly against the fixed core 2.

This suction-held state is shown in FIG.

FIG. 5 shows details of the contact 7, in which the movable contact A
is formed into a plate shape, and the fixed contact 7B has band-shaped plates made of conductive spring material such as beryllium copper or phosphor bronze disposed facing each other, and has a curved portion at the tip so that the protrusions face each other.

By forming the fixed contact 7B in this way, the movable contact 7A comes into sliding contact with the curved portion of the fixed contact 7B when the circuit is closed, and this contact pressure allows the contacts to easily open and close even when subjected to vibrations, shocks, etc. It disappears.

FIG. 6 is a characteristic curve of movable core stroke versus suction force and load torque, with the horizontal axis representing the stroke of the movable core 3 and the vertical axis representing suction force and load torque.

In FIG. 6, a straight line A represents the entire stroke of the movable iron core 3, a straight line B represents the stroke of the movable iron core 3 moved by the pin 12, a curve C represents the suction force, and a curved line represents the load torque.

FIG. 6 shows that the movable iron core 3 of the above embodiment is pressed by the pin 12 and is attracted to the electromagnet at the position indicated by the dashed line, that is, when the attraction force becomes larger than the load torque.

Figures 7a and 7l) show examples in which the relay according to the present invention is applied to a breaker closing control circuit, and as is clear from Figure 7, the circuit configuration is extremely simplified.

Therefore, the occurrence of failures, etc. is reduced, and the reliability of the circuit can be improved.

As described above, according to the present invention, even when excited with the rated power, the movable member is configured so that it will not be attracted unless it approaches the electromagnet side at a predetermined distance, and the contacts are configured so that they do not open due to vibration shock, etc. The structure is extremely simple, and even when used in a control circuit, there is no need for complex contact circuits or self-holding contacts, so the occurrence of failures is drastically reduced, and the contacts are resistant to vibration and shock. Since there is no possibility of separation, there is no chattering or the like, and there is no need to connect a resistor in parallel to the self-holding contact as in the conventional case.

[Brief explanation of the drawing]

Fig. 1 a, l) is a circuit connection diagram for explaining a conventional breaker closing control circuit, Fig. 2 is a configuration diagram showing an embodiment of the present invention, Figs. 3 and 4 are Fig. 2 Fig. 5 is an enlarged view of the contact points, Fig. 6 is a characteristic curve of stroke vs. suction force and load torque, Fig. 7 is a, l)
is a circuit connection diagram when the relay according to the present invention is used in a circuit breaker closing control circuit. 1... Coil, 2... Fixed core, 3.
...Movable iron core, 4...Yoke, 5...
...Return spring, 6...Insulation plate, 7...
...Contact, 7A...Movable contact, 7B...
... Fixed contact, 11 ... Plate metal fitting, 12
······pin.

Claims (2)

[Scope of utility model registration request] (1) An electromagnet attached to the base, a movable member that is not attracted even if the power used to excite the electromagnet is at the rated value, and a return spring with one end attached to the movable member and the other end attached to the base. , comprising a contact that does not open even when subjected to vibration or impact, with one end attached to the movable member and the other end attached to the base, and a movable member drive pin that moves the movable member within the attractable range of the electromagnet. A relay featuring: (2) The relay according to claim 1, wherein the fixed contact is made of a conductive spring material and the movable contact is in sliding contact with the fixed contact.