JPS6112613B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electromagnetic relay in which a terminal hole through which an external terminal is inserted is sealed, and at the same time an insulating layer is formed between an electromagnetic coil and an iron core using the sealing material.

Conventionally, in an electromagnetic relay in which external terminals 40 are led out to the lower part of a box-shaped base 41 as shown in FIG.
is sealed from the outside of the base bottom portion 42 with a sealing material 44 . This sealing material 44 swells up on the external terminals 40 as shown in the figure, so when each external terminal 40 is inserted into the terminal hole of a printed circuit board (not shown), the sealing material 44 with a high bulging height forms the terminal hole of the printed circuit board. The inlet becomes clogged, and the stability of the box-shaped base 41 is impaired.

Furthermore, an insulating sheet 48 is interposed between the electromagnetic coil 46 and the iron core 47 of the electromagnetic block 45, but since there is a gap 49 between the insulating sheet 48 and the electromagnetic coil 46, there is a gap 49 between the electromagnetic coil 46 and the iron core 47.
Since the heat dissipation effect to the electromagnetic coil 7 is poor, it is difficult to maintain the life of the electromagnetic coil 46. In addition, it takes time and effort to attach the insulating sheet 48, and each of the terminal holes 43 is
Another drawback is that the work efficiency is not improved due to the fact that it is sealed.

This invention solves the above-mentioned drawbacks, stabilizes the seating of the box-shaped base on the printed circuit board, and efficiently seals each terminal hole and insulates between the iron core and the electromagnetic coil at the same time. The purpose of the present invention is to provide an electromagnetic relay that not only extends the life of the relay but also can firmly fix external terminals and electromagnetic blocks.

Embodiments of the present invention will be described below based on the drawings.

In FIG. 1, 10 is a relay main body set within a box-shaped base 11. The electromagnetic block of the relay body 10 has upwardly bent pieces 13 at both ends.
14, the bent pieces 13, 14
The spool 16 fitted in between, this spool 16
It consists of an electromagnetic coil 17 wound around. 18 is a through hole formed in the center of the spool 16, and a movable iron piece 20 to which a movable contact piece 19 is fixed is inserted into the through hole 18. The base end 21 of the movable iron piece 20 is supported by the bent piece 14 of the iron core 15, and the tip end 22 is arranged on the other bent piece 13. By energizing the electromagnetic coil 17, the iron core 15
The tip 22 of the movable iron piece 20 is attracted to the bent piece 13 of the movable contact piece 19, and the movable contact 23 provided at the tip of the movable contact piece 19 changes from the normally closed fixed contact 24 to the normally open fixed contact 25.
Switch to . When the electromagnetic coil 17 is de-energized, the hinge spring 26 formed at the base of the movable contact piece 19 causes the movable iron piece 20 to return, and the movable contact 23 to switch to its original state.

The external terminal 27a of the movable contact piece 19 supported by the bent piece 14 of the iron core 15, the external terminal 27b with the normally closed fixed contact 24, the external terminal 27c with the normally open fixed contact 25, and the electromagnetic coil 17 are connected. A pair of external terminals (only one of which is shown) 27d is inserted into each terminal hole 29 formed in the base bottom 28, and the lower end lead portion of each is inserted into the base bottom 28.
It protrudes from the bottom of 8. After each external terminal 27 (a to d) is inserted into the respective terminal hole 29 and the electromagnetic block 12 is set in the box-shaped base 11, the sealing material 30 is poured into the box-shaped base 11. , each terminal hole 29 is sealed at once. Since the sealing material 30 that has flowed into the box-shaped base 11 does not adhere to the terminal lead-out surface 31 of the base bottom 28, the box-shaped base 11 can be seated stably on the printed circuit board (not shown).

The sealing material 30 is flowed to a depth that at least fills the gap between the iron core 15 and the electromagnetic coil 17. As a result, each terminal hole 29 is sealed, and at the same time,
Insulating layer 32 between iron core 15 and electromagnetic coil 17 is efficiently formed, and each external terminal 27 (a to d) and electromagnet block 12 are firmly fixed to box-shaped base 11. Further, the insulating layer 32
In other words, the sealing material 30 connects the iron core 15 and the electromagnetic coil 1.
Since the gap between the electromagnetic coil 17 and the iron core 15 is completely filled, heat is actively radiated from the electromagnetic coil 17 to the iron core 15, and the life of the electromagnetic coil 17 is extended.

Note that if a recess 33 is formed on the terminal lead-out side of the terminal hole 29, even if the sealing material 30 leaks from the terminal hole 29, the leaked sealing material will be stretched and hardened in the recess 33, and the terminal lead-out surface will be cured. No adhesion to 31.
Also, as shown in Fig. 2, the case 34 is attached to the box-shaped base 1.
When the case 34 is fitted to the upper end 35 of the peripheral wall 1, the case 34
By immersing the lower end portion 36 of the peripheral wall into the sealing material 30 within the box-shaped base 11, the fitting portion 37 between the box-shaped base 11 and the case 34 can be sealed.

As described above, according to the present invention, the box-shaped base can be seated stably on the printed circuit board, and the sealing of each terminal hole and the insulation between the iron core and the electromagnetic coil can be efficiently performed at the same time. In addition to extending the life of the electromagnetic coil, the external terminal and electromagnetic block are firmly fixed.

[Brief explanation of drawings]

Fig. 1 is a partially cutaway side view of an electromagnetic relay according to an embodiment of the present invention, Fig. 2 is a partially cutaway side view showing the sealing structure between the case and the base, and Fig. 3 is a partially cutaway side view of a conventional example. It is a diagram. 10...Relay body, 11...Box-shaped base, 2
7a, 27b, 27c, 27d...external terminal, 2
9...Terminal hole, 30...Sealing material, 33...Recess, 37...Fitting part.

Claims (1)

[Scope of Claims] 1. A relay main body is set in a box-shaped base having a terminal hole, an external terminal is inserted into the terminal hole, a sealing material is caused to flow into the box-shaped base, and the relay body is set in a box-shaped base having a terminal hole. An electromagnetic relay that seals and fills at least the gap between the electromagnetic coil and the iron core. 2. The electromagnetic relay according to claim 1, wherein a recess is formed on the terminal lead-out side of the terminal hole. 3. The electromagnetic relay according to claim 1 or 2, wherein the fitting portion between the box-shaped base and the case is sealed with a sealing material poured into the box-shaped base.