JPH0218912Y2 - - Google Patents

Description

[Detailed description of the invention] [Technical field to which the invention pertains] This invention relates to a reset mechanism for a magnetic latch relay used in a protective relay or the like.

[Prior art and its problems]

Conventionally, mechanical latching type relays have been used in protective relays, etc., and these types of mechanical latching type relays are shown in Figures 1 and 2. Figure 1 is a side view of the main parts, and Figure 2 is a side view of the main parts. It is a rear view of the main part.

In FIG. 1, reference numeral 1 denotes a housing, and in this housing 1, a reset button 2 is pressed against a reset rod 19 by a spring 3. As shown in FIG. 2, a base 5 to which terminals 5a, 5b and fixed contact plates 16a, 17a are fixed is fixed to the printed board 4 in the housing 1. A yoke 8 is attached to the base 5 via a spacing piece 5c, and an iron core 7 around which a coil 6 is wound is magnetically coupled and attached to the yoke 8, and a reset rod support 9 is fixed with a screw 10. ing. An auxiliary yoke 8a is fixed to the yoke 8, and an armature 12 hinged to the auxiliary yoke 8a at a hinge portion 12a is locked to the other end of the return spring 11, which has one end locked to the auxiliary yoke 8a. There is.
A movable contact plate 15a and an insulating plate 14 are fixed to the yoke 8 via a spacing piece 13, and the movable contact plate 15
The movable contact 15 of a becomes the fixed a contact 16 at the time of reset.
is in contact with. A locking pawl 18 is coupled to the insulating plate 14, and the locking pawl 18 engages with a reset surface 19a of a reset rod 19. The reset rod 19 is supported by a reset rod support 9, and a spring 21 having a stronger force than the spring 3 is attached to the reset rod 19. 20 is a retaining ring.

When a trip signal is input to terminals 5a and 5b from a control circuit (not shown) in the reset state shown in FIGS. 1 and 2, coil 6 is excited and armature 12 is attracted to iron core 7. When the armature 12 is attracted to the iron core 7, the movable contact 1
5 is separated from the fixed a contact 16 and comes into contact with the fixed b contact 17. Further, as the armature 12 is attracted to the iron core 7, the engagement between the locking pawl 18 and the reset surface 19a of the reset rod 19 is released, and the reset rod 19 moves the reset button 2 upward in FIG. 1 by the force of the spring 21. At the same time, the trip surface 19b of the reset bar 19 faces the locking pawl 18 and engages with the locking pawl 18. As a result, the armature 12 is maintained in a state where it is attracted to the iron core 7, and even when the excitation of the coil 6 is released, it is maintained in a trip state. This relay is reset by pressing the reset button 2 from the outside of the housing 1. When the reset button 2 is pressed, the reset rod 19 moves downward in FIG. When released, the armature 12 is reset by being rotated counterclockwise in FIG. 2 by the action of the return spring 11. The locking pawl 18 is connected to the reset surface 19 of the reset rod 19.
The reset state is maintained by engaging with a.

By the way, the electromagnet of this relay attracts the armature 12 to the iron core 7 against the force of the return spring 11 and the force of disengaging the reset surface 19a of the reset rod 19 from the locking pawl 18 during the trip operation. Since force is required, the capacity of the coil 6 must be increased, and the reset surface 1 of the reset rod 19 must be increased.
The sliding part between 9a and the locking claw 18 is the contact point 1 of each
5, 16, and 17, there is a drawback that abrasion powder from the sliding parts may adhere to the contacts and cause poor contact. Another drawback is that if the reset button is pressed while the relay is in a tripped state, the contacts will instantly return to normal, which is dangerous.

[Purpose of invention]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a magnetic latch relay reset device which eliminates the drawbacks of conventional devices and is simple in construction and highly reliable.

[Key points of the idea]

The main points of this invention are an iron core around which a coil is wound,
In a magnetic latch relay in which a magnetic circuit is formed by a yoke magnetically coupled to the iron core and an armature having one end hinged to the yoke and the other end facing the iron core, one end of the armature hinged to the yoke is extended. A reset piece is formed, and a reset rod is provided that comes into contact with this reset piece. By pushing the reset rod while the armature is attracted to the iron core, the armature rotates around the iron core as a fulcrum, and the armature and the yoke come into contact with each other. The point is that it separates the two.

[Example of idea]

Figures 3 to 5 show one embodiment of the present invention, Figure 3 is a side view of the main part, Figures 4 and 5 are explanatory views of the operation, and each figure shows the same as shown in Figure 1. Components having the same functions as those shown in FIG.

In FIG. 3, a support 32 for supporting the movable contact plate 15a is fixed to the armature 31 which is hinged to the yoke 8, and one end of the hinge portion 12a of the armature 31 is extended to form a hole 36a in a case 36 which is attached to the base 5. It is formed as a reset piece 31a that penetrates through. armature 31
The tip of a reset rod 23 attached to the housing 1 faces the reset piece 31a. The other configurations are the same as those shown in FIG.

In this embodiment, when a trip signal is input to the terminals 5a and 5b from a control circuit (not shown), the coil 6
is excited, the armature 31 is attracted to the iron core 7, and the movable contact 15 is switched from the fixed A contact 16 to the fixed B contact 17, as shown by the solid line in FIG.
In this state, iron core 7, yoke 8, armature 31
A magnetic circuit is formed by this, and by momentarily strongly exciting the coil 6 when the coil 6 is turned on, a residual magnetic flux is generated within the magnetic circuit. Even when the excitation of the coil 6 is released due to the residual magnetic flux generated in the magnetic circuit, the armature 31 is held in a trip state where it is attracted to the iron core 7. In this embodiment, the relay is reset by pressing the reset rod 23. When the reset rod 23 is pressed, the armature 31 rotates clockwise about the iron core 7 as shown by the dotted line in FIG. is blocked.
When the armature 31 and the yoke 8 are separated and a gap is created in the magnetic circuit, the permeance of the magnetic circuit decreases, and when the residual magnetic flux rapidly decreases and disappears, the armature 31 separates from the iron core 7 as shown in FIG. The load of the return spring 11 is applied to the movable contact 1
5 and the reset rod 23, and the armature 3
1 stands out. When the pressure on the reset rod 23 is released, the return spring 11 causes the armature 31 to rotate counterclockwise about the contact point between the movable contact 15 and the fixed a contact 17. And armature 31
When the yoke 8 contacts the hinge part 12a, the armature 31 rotates counterclockwise about the hinge part 12a, and the movable contact 15 contacts the fixed a contact 1.
7 and comes into contact with the fixed b contact 16, resulting in a reset state as shown in FIG. Here, if the reset rod 31 is mistakenly pressed momentarily when the relay is in the trip state (the state shown by the solid line in Figure 4), the magnetizing force of the iron core 7 will not be weakened so much, so as shown in Figure 4. Armature 31 as shown by the dotted line
is adsorbed to the iron core 7, and the reset rod 2
When the pressure 3 is released, the state becomes as shown by the solid line in FIG. 4, and the relay maintains the trip state.

[Effect of idea]

According to this invention, there are few mechanically sliding parts, and the coil capacity can be made smaller than that of conventional devices because the only force necessary is to overcome the return spring and attract the armature when the relay trips. Further, the relay part and the reset part can be separated, a cover can be attached to protect the relay, and dust can be prevented from entering the contact part, so there is an advantage that the contact reliability of the contact part is improved. Furthermore, since the structure of the magnetic latch relay is almost the same as that of commercially available products, investment in molds is small and it is economical.

[Brief explanation of the drawing]

Figures 1 and 2 each show a conventional device, Figure 1 is a side view of the main part thereof, Figure 2 is a rear view of the main part, and Figures 3 to 5 each show an embodiment of the present invention. , FIG. 3 is a side view of the main part, and FIGS. 4 and 5 are explanatory views of the operation. 6...Coil, 7...Iron core, 8...Yoke, 1
2a...Hinge part, 23...Reset rod, 31...
... Armature, 31a... Reset piece.

Claims (1)

[Scope of utility model registration request] The magnetic latch relay includes an iron core around which a coil is wound, a yoke magnetically coupled to the iron core, and an armature having one end hinged to the yoke and the other end facing the iron core to form a magnetic circuit. One end hinged to the yoke of the armature is extended to form a reset piece, and a reset rod is provided that comes into contact with this reset piece, and when the armature is attracted to the iron core and the reset rod is pushed, the armature moves around the iron core as a fulcrum. A reset mechanism for a magnetic latch relay characterized by rotating to separate the contact between the armature and the yoke.