JPH08287807A - Electromagnetic relay - Google Patents

Abstract

PURPOSE: To improve withstand voltage between a primary coil, a secondary fixed contact a movable contact, and a movable spring. CONSTITUTION: A spool 2 on which a coil 1 is wound is stored in a coil storing part 13 integrated with a base 15. Both ends of spool 2 as well as inner walls at both ends of the part 13 are brought into close contact in connecting an end of a core 3 protruding forwards and a yoke 4 mechanically and magnetically after the core 3 is made to pass through holes at both ends of the part 3. A large improvement in withstand voltage is made possible since the insulation distance between the coil 1, a movable contact 9, a fixed contact 8, and a movable spring 7 is made long.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a small electromagnetic relay.

[0002]

2. Description of the Related Art Conventionally, this electromagnetic relay, in which a current is applied to a coil to form a magnetic field and thereby opens and closes a contact, includes an armature attracted to a core, a yoke or a core, a rester spring supporting the armature and a movable contact. It is configured to have a movable spring and the like.

FIG. 5 is an exploded perspective view of an electromagnetic relay showing an example of the related art. As shown in FIG. 5, in such a conventional electromagnetic relay, a core 3 is inserted into a spool 2 around which a coil 1 is wound, and one end of a yoke 4 is fixed to one end of the core 3. An armature 6 is supported by the rester spring 5 fixed to the yoke 4 at the other end of the yoke 4 that is bent in an L shape. The armature 6 faces the magnetic pole surface that is the other end of the core 3. One end of the armature 6 bent in a dogleg shape presses a movable spring 7, and the movable spring 7 has a movable contact 9 at a position facing the fixed contact 8 at the end. The base 10 is fitted with the case 11, and the lower surface opening is sealed with an epoxy sealant 12 as shown in FIG.

When a current is passed through the coil 1 of the electromagnetic relay, the armature 6 is attracted to the core 3 and the electromagnetic contact / disconnection operation between the movable contact 9 and the fixed contact 8 becomes possible. This electromagnetic relay has a coil 1 on the primary side and a movable contact 9 on the secondary side,
Since the insulation distance cannot be made large due to the lack of the space distance and the creepage distance between the fixed contact 8 and the movable spring 7,
Withstand voltage performance is low.

Conventionally, as a structure for enhancing the withstand voltage performance,
There are various examples. For example, in a polarized electromagnetic relay,
A coil block body composed of a coil, a spool, and a core is horizontally stored in a coil housing part integrally molded with a base, and a contact is opened and closed through an armature made of a plastic molded body, a permanent magnet, and a soft magnetic material ( First method),
Similarly, the coil block body is housed, but the housing part is not integrally formed with the base and also serves as an armature (second method), or conversely to the above, movable contact, fixed contact, movable spring, etc. A coil molding in which a contact block made of a material is surrounded by a plastic molding (third method), and further, a spool around which the coil is wound and an insulating cover as a secondary molding which covers the surface of the coil are provided (fourth method ), Etc.

[0006]

The conventional electromagnetic relay described above is complicated in the first method because the insulation distance between the coil on the primary side, the movable contact and the fixed contact on the secondary side, and the movable spring is large. In addition to the fact that it is necessary to mold the coil storage portion having a different shape, it is difficult to fix the stored coil block in a stable state with little variation.

In the second and third methods, since the coil and the contact mechanism portion are provided with a certain space distance, it is impossible to obtain a dielectric strength voltage higher than a certain level.

Further, in the first to third methods, the armature of the plastic molding provided for increasing the insulation distance or the armature of the plastic molding or the contact mechanism portion of the plastic molding that also serves as the coil storage portion is directly movable. Since it is in contact with the contact, there is a risk that the contact part and its surroundings may be melted by the movable spring which becomes hot when the contact is energized.

The fourth method has a drawback that the coil is broken by the high-temperature and high-pressure secondary molding resin when molding the spool around which the coil is wound and the surface of the coil. Further, there is a problem that the manufacturing cost is significantly increased because the spool and the coil are molded again.

[0010]

The electromagnetic relay of the present invention comprises:
The spool around which the coil is wound is housed in a hollow part that is integrally molded with the base, and is mechanically and magnetically joined to the core that penetrates the holes provided at both end faces of the spool housing and one end of this core. The yoke is supported by the inside of both ends of the spool housing so that both ends of the spool come into close contact with each other, and a contact mechanism unit interlocking with the armature arranged facing the magnetic pole surface of the core is provided outside the spool housing. ing.

[0011]

Embodiments of the present invention will now be described with reference to the drawings. FIG. 1 is an exploded perspective view of an electromagnetic relay showing one embodiment of the present invention, and FIG. 2 is a rear view after assembly.
FIG. 3 is a spool storage portion 13 of the electromagnetic relay shown in FIG.
FIG. As shown in FIGS. 1 to 3, the spool 2 around which the coil 1 of this embodiment is wound is accommodated from below in a spool accommodating portion 13 formed integrally with the base 15, and the core 3 is penetrated from the side. When the yoke 4 is mechanically and magnetically joined to the end of the core 3 protruding forward, both ends of the spool 2 and the inner walls of both ends of the spool accommodating portion 13 are brought into close contact with each other. An armature 6 is supported on the other end of the yoke 4 by a rester spring 5 fixed to the yoke 4, and faces the magnetic pole surface of the core 3. The other end of the armature 6 contacts the movable spring 7, and the movable spring 7
A movable contact 9 is provided at the tip of the movable contact 9 at a position facing the fixed contact 8. The base 15 is fitted to the case 11, and the lower opening surface of the spool housing portion 13 is an insulator (insulating plate).
After being closed at 14, it is sealed with an epoxy-based sealant 12.

In the electromagnetic relay having such a structure, the coil 1 can be sealed in the coil housing portion 13,
The withstand voltage between the coil 1, the fixed contact 8, the movable contact 9, and the movable spring 10 can be dramatically increased.

FIG. 4 is a sectional view of the spool accommodating portion 13 in the electromagnetic relay for explaining another embodiment of the present invention. As shown in FIG. 4, in this embodiment, the fan-shaped flange portion 1 is provided at both ends of the spool accommodating portion 13 integrally formed with the base 15.
7 is provided to closely fit with the circular flange portions 16 provided at both ends of the spool 18. In the case of this embodiment, since the fitting of the flange portion is added, the reliability of the withstand voltage can be enhanced as compared with the previous embodiments.

As still another embodiment, when the insulator 14 shown in FIGS. 3 and 4 is deleted and the case 11 and the base 15 are sealed with the epoxy type sealant 12, the spool 2 housed in the spool housing portion 13 is closed. , 18 may be embedded with the epoxy-based sealant 12. In the case of the present embodiment, the number of parts can be reduced, the reliability of the withstand voltage can be further improved as compared with the first and second embodiments, and the manufacturing cost is not significantly increased.

[0015]

As described above, in the electromagnetic relay of the present invention, since the spool is hermetically sealed in the spool housing portion integrally formed with the base, the coil and the contact mechanism portion including the movable contact, the fixed contact, and the movable spring are formed. There is an effect that the withstand voltage can be dramatically increased, the manufacturing process is not complicated, and the manufacturing cost is not increased.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of an electromagnetic relay according to an embodiment of the present invention.

FIG. 2 is a rear perspective view of the electromagnetic relay in FIG.

FIG. 3 is a sectional view of a spool housing portion of the electromagnetic relay shown in FIG.

FIG. 4 is a sectional view of a spool housing portion of an electromagnetic relay according to another embodiment of the present invention.

FIG. 5 is a perspective view of a conventional electromagnetic relay.

6 is a rear perspective view of the electromagnetic relay of FIG.

[Explanation of symbols]

 1 Coil 2 Spool 3 Core 4 Yoke 5 Lester Spring 6 Armature 7 Moving Spring 8 Fixed Contact 9 Moving Contact 10 Base 11 Case 12 Epoxy Sealant 13 Spool Housing 14 Insulator 15 Base 16 Circular Flange 17 Flanged Flange 18 Spool

Claims (3)

[Claims] 1. A core, in which a spool around which a coil is wound is housed in a hollow spool housing portion integrally formed with a base, and a core penetrating through holes provided at both end surfaces of the spool housing portion.
A yoke, which is mechanically and magnetically joined to one end of the core, supports both ends of the spool so as to be in close contact with inner walls of both ends of the spool housing portion, and is arranged to face a magnetic pole surface of the core. An electromagnetic relay, characterized in that a contact mechanism portion interlocked with the stored armature is provided outside the spool housing portion. 2. The spool storage portion is in the shape of a semi-cylindrical rod, and fan-shaped flange portions are provided at both ends thereof, so that the circular flange portions provided at both end portions of the spool and the fan-shaped flange portions are closely fitted to each other. The electromagnetic relay according to claim 1, which is characterized in that. 3. The spool is embedded and fixed in the spool by an adhesive.
Alternatively, the electromagnetic relay according to claim 2.