JP2591350B2 - Electromagnetic relay - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic relay, and more particularly to an electromagnetic relay having an improved fixed contact terminal structure.

[0002]

2. Description of the Related Art Conventionally, many electromagnetic relays of this type have a structure in which a coil assembly or an armature assembly is mounted on an insulator base, covered with a cover, and sealed with a resin.

FIG. 7 is an exploded perspective view of an electromagnetic relay showing an example of the related art. As shown in FIG. 7, in a conventional armature assembly 10 of an electromagnetic relay, a movable contact spring 3 having a movable contact 1 and a hinge spring 2 is arranged on both sides of an armature 4 and integrally fixed by an insulating fixed body 5. It is composed. This is also called a movable contact spring block. Further, the coil assembly 17 winds a coil around a coil spool 8 in which the U-shaped iron core 6 and the coil terminal 7 are embedded, and fixes the permanent magnet 9 in a permanent magnet mounting hole provided in the central part inside the iron core 6. It is composed. Note that the tilting movement of the armature 4 is performed in a state where the protrusion on the lower surface of the central portion of the armature serves as a fulcrum and is in contact with the upper end surface of the permanent magnet 9. Further, the insulator base 15 includes a fixed contact terminal 12 to which the fixed contact 11 is fixed and a neutral terminal 13.
And the coil lead-out terminal 14 is embedded. When assembling, the coil assembly 1 is placed inside the insulator base 15.
7 is mounted, and the coil terminal 7 and the coil lead-out terminal 14 are joined by a method such as welding. Next, mounting of the armature assembly 10 as a movable contact spring block is performed by fixing the hinge spring 2 and the neutral terminal 13. Finally, the cover 16 is attached, the lower surface of the insulator base 15 and the peripheral portion of the inner wall of the cover 16 are filled with a sealant, and heat is applied to cure the sealant, thereby forming a relay. The fixed contact terminal 12 in such an electromagnetic relay is a single plate and is embedded in the insulator base 15.

FIG. 8 is a cross-sectional view of a fixed contact terminal portion for explaining the carbonizing action in the electromagnetic relay shown in FIG.
As shown in FIG. 8A, a fixed contact terminal 12 having a conventional fixed contact 11 is a single plate and is buried in an insulator base 15. Therefore, the difference between the height of the fixed contact 11 and the surface of the terminal holding portion 15A of the insulator base 15 is a. At this time, as shown in FIG. 8 (b), when the terminal pressing portion 15A is carbonized by the heat of the arc discharge generated between the contacts, a carbonized portion 18 is formed, and the height of the terminal pressing portion 15A is fixed to the fixed contact. 11 may be exceeded.

[0005]

In the above-mentioned conventional electromagnetic relay, a fixed contact terminal having a contact terminal is embedded in an insulator base. For this reason, the insulator of the insulator base, that is, the terminal pressing portion, is higher than the upper surface of the fixed contact terminal. Therefore, since the distance between the insulator and the fixed contact fixed to the fixed contact terminal is short, when a large current or a large voltage is cut off between the contacts, the insulator is melted by the heat of the generated arc discharge and It is carbonized and rises. As a result, there is a drawback that the withstand voltage between the contacts is reduced and the voltage / current interruption capability is reduced.

[0006] An object of the present invention is to provide an electromagnetic relay capable of increasing the withstand voltage between the contacts and improving the voltage / current interruption capability.

[0007]

According to the present invention, there is provided an electromagnetic relay comprising:
A coil assembly having a permanent magnet arranged so that a magnetic pole contacts a U-shaped iron core wound with a coil, the permanent magnet, a coil spool for integrally fixing the U-shaped iron core, and both ends of the U-shaped iron core A hinge spring that supports a seesaw operation for contacting and separating both ends of the armature and both ends of the U-shaped iron core so that both ends of the armature are opposed to each other; An armature assembly for integrally fixing a movable contact spring interlocking with a seesaw operation with an insulator; and an armature having a box shape with an open top and the permanent magnet serving as a fulcrum of the seesaw operation of the armature. An insulator base in which a fixed contact terminal having a fixed contact facing the movable contact formed on the movable contact spring when the pole assembly is disposed and a neutral terminal connected to one end of the hinge spring are implanted. And a cover that covers the insulator base on which the coil assembly and the armature assembly are disposed, and seals an opening between the cover and the insulator base with a sealant. In the electromagnetic relay, a first fixed contact terminal to which the fixed contact is attached, and a second fixed contact terminal that is coupled to the first fixed contact terminal and embedded in the insulator base, The upper surface of the first fixed contact terminal is configured to be at a position higher than the terminal pressing portion of the insulator base.

[0008]

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is an enlarged perspective view of a fixed contact terminal portion in an electromagnetic relay for explaining a first embodiment of the present invention. In this embodiment, the armature assembly 10, the coil assembly 17 including the permanent magnet 9, the insulator base 15, and the cover 16 of FIG. This is in the structure of the fixed contact terminal 12 on the base 15. Hereinafter, only the fixed contact terminal different from the above-described conventional example of FIG. 7 will be described. As shown in FIG. 1, the fixed terminal portion of the present embodiment is embedded in the first fixed contact terminal 12A having the fixed contact 11 and the corner of the insulator base 15 and welded to the first fixed contact terminal 12A. And is formed in a double structure with the second fixed contact terminal 12B fixed by.
As a result, the upper surface of the first fixed contact terminal 12A is located higher than the surface of the corner portion of the insulator base 15.

FIG. 2 is a sectional view of the fixed contact terminal portion shown in FIG. As shown in FIG. 2, the first fixed contact terminal 12A having the fixed contact 11 is electrically connected to the second fixed contact terminal 12B embedded in the insulator base 15,
Moreover, the second fixed contact terminal 12B is held by the terminal holding portion 15A. In such a shape, the carbonization of the terminal pressing portion 15A based on the arc discharge of the fixed contact 11 is prevented by the first fixed contact terminal 12A.

FIG. 3 is a cross-sectional view of the fixed contact terminal for explaining the carbonizing action in the first embodiment of the present invention.
As shown in FIG. 3A, assuming that the height of the fixed contact 11 is a and the thickness of the first fixed contact terminal 12A is b, the height of the fixed contact 11 and the terminal pressing portion on the insulator base 15 are shown. The height difference of 15A is (a + b). At this time, FIG.
As shown in (b), the heat of the arc discharge carbonizes the tip of the terminal holding portion 15 to form a carbonized portion 18 as in the conventional example, and the carbonized portion 18 has the height (a + b) of the contact 11. Never exceed.

Table 1 shows the results of the conventional example and the present embodiment.
This is a result of a load current interruption capability test of 50 Vrms and 3.0 A, and it is found that the interruption capability is improved in this embodiment.

[0013]

FIG. 4 shows a fixed contact terminal portion in an electromagnetic relay for explaining a second embodiment of the present invention.
(A) is a plan view thereof, and (b) is a cross-sectional view thereof. FIG.
As shown in (a) and (b), in the present embodiment, the fixed contact 11
In order to secure a distance between the first fixed contact terminal 12A and the corner surface of the insulator base 15, a concave portion is formed around the first fixed contact terminal 12A to increase the surface area to provide a heat radiation effect.
Has been formed. In this embodiment, the current interrupting ability can be further improved.

FIG. 5 shows a fixed contact terminal portion in an electromagnetic relay for explaining a third embodiment of the present invention.
(A) is a plan view thereof, and (b) is a cross-sectional view thereof. FIG.
As shown in (a) and (b), the present embodiment is in that the area of the heat radiating portion 20 formed above the first fixed contact terminal 12A is increased. As a result, the terminal holding portion 1 that holds the second fixed contact terminal 12B embedded in the insulator base 15 is formed.
5A can be reliably protected.

FIG. 6 shows a fixed contact terminal portion in an electromagnetic relay for explaining a fourth embodiment of the present invention.
(A) is a plan view thereof, and (b) is a cross-sectional view thereof. FIG.
As shown in FIGS. 5A and 5B, this embodiment has a notch 2 above the first fixed contact terminal 12A in the embodiment of FIG.
That is, the heat radiating portion 22 provided with the first heat radiating portion 1 is formed. This embodiment can further improve the heat radiation effect.

The shape and size of the above-mentioned first fixed contact terminal 12A are not limited to those shown in the figure, and the fixing between the double fixed contact terminals 12A and 12B is performed by welding, crimping, fitting, or the like. It can be carried out.

[0018]

As described above, according to the present invention, the fixed contact terminals are doubled, and the upper surface of the first fixed contact terminal having the fixed contacts is positioned higher than the surface of the terminal pressing portion of the insulator base. As a result, the creepage distance between the corner portion of the insulator base and the fixed contact can be increased, and the reduction of the withstand voltage between the contacts due to the carbonization of the insulator can be suppressed, and the voltage / current interrupting ability can be improved. .

[Brief description of the drawings]

FIG. 1 is an enlarged perspective view of a fixed contact terminal portion in an electromagnetic relay for explaining a first embodiment of the present invention.

FIG. 2 is a sectional view of a fixed contact terminal portion shown in FIG.

FIG. 3 is a cross-sectional view of a fixed contact terminal portion for explaining a carbonizing action in the first embodiment of the present invention.

4A and 4B show a fixed contact terminal portion in an electromagnetic relay for explaining a second embodiment of the present invention, wherein FIG. 4A is a plan view and FIG. 4B is a sectional view thereof.

FIGS. 5A and 5B show a fixed contact terminal portion in an electromagnetic relay for explaining a third embodiment of the present invention, wherein FIG. 5A is a plan view and FIG.

6A and 6B show a fixed contact terminal portion in an electromagnetic relay for explaining a fourth embodiment of the present invention, wherein FIG. 6A is a plan view and FIG. 6B is a cross-sectional view.

FIG. 7 is an exploded perspective view of an electromagnetic relay showing an example of the related art.

FIG. 8 is a cross-sectional view of a fixed contact terminal portion for describing a carbonizing action in the electromagnetic relay shown in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Movable contact 2 Hinge spring 3 Movable contact spring 4 Armature 5 Insulation fixed body 6 Iron core 8 Coil spool 9 Permanent magnet 10 Armature assembly 11 Fixed contact 12A, 12B Fixed contact terminal 15 Insulator base 15A Terminal holding part 16 Cover 17 Coil assembly 18 Carbonized part 19,20,22 Heat radiating part 21 Notch

Claims (2)

(57) [Claims] 1. A coil assembly comprising: a permanent magnet disposed so that a magnetic pole contacts a U-shaped iron core on which a coil is wound; and a coil spool for integrally fixing the permanent magnet and the U-shaped iron core; An armature arranged such that both ends of the armature are opposed to both ends of the U-shaped iron core, and a hinge spring for supporting a seesaw operation for contacting and separating both ends of the armature from the two ends of the U-shaped iron core An armature assembly for integrally fixing a movable contact spring interlocking with the seesaw operation of the armature with an insulator; a box-shaped top opening and the permanent magnet having a fulcrum for the seesaw operation of the armature; A fixed contact terminal having a fixed contact opposed to a movable contact formed on the movable contact spring when the armature assembly is arranged so as to form a neutral terminal connected to one end of the hinge spring. And a cover that covers the insulator base on which the coil assembly and the armature assembly are disposed, and seals between the opening of the cover and the insulator base. An electromagnetic relay sealed with an agent, wherein a first fixed contact terminal having the fixed contact applied thereto, and a second fixed contact terminal coupled to the first fixed contact terminal and embedded in the insulator base And an upper surface of the first fixed contact terminal is located at a position higher than a terminal pressing portion of the insulator base. 2. The electromagnetic relay according to claim 1, wherein the first fixed contact terminal is provided with a heat radiating portion around the first fixed contact terminal.