JPS607010Y2 - Terminal sealing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates to a terminal sealing device that seals between a base and a terminal projecting outwardly through the base.

Conventionally, in sealed electrical equipment such as electromagnetic relays and microswitches, as shown in FIG.
3 is filled with a sealing material 24 such as synthetic resin and sealed.

By the way, the operation of injecting the sealing material 24 is performed using an injection device such as a syringe, but since the recess 23 is small, this operation is extremely difficult, and if the injection operation is too busy, the upper part of the terminal 22 may be damaged. In other words, the sealing material 24 adheres to the soldering portion, impairing the soldering workability, prolonging the heating time, and heating the terminal 22 more than necessary.

This is a factor in thermally deteriorating the sealing material 24 due to heat shock during soldering and reducing sealing performance.

In addition, in the conventional sealing structure, since the terminal insertion hole 25 connecting the bottom of the recess 23 and the inside of the base 21 is slightly larger than the terminal width, the sealing material filled in the recess 23 24 fills the terminal insertion hole 25 due to capillary action and leaks into the base 21 through the terminal 22.
The sealant may adhere to electrical components located inside the base 21, causing malfunction.

In view of the above points, this invention facilitates the injection work for filling the sealant, prevents the sealant from adhering to excess parts such as the soldered parts of the terminal, and prevents the sealant from flowing inside the base. It is an object of the present invention to provide a terminal sealing device that can prevent leakage, prevent malfunctions, and improve sealing performance.

Hereinafter, embodiments of this invention will be described based on the drawings.

In FIGS. 1 and 2, 11 is a case housing electrical equipment (not shown), 12 is a base fitted into the open part of the case 11, and the base 12 has a plurality of recesses 13. is formed.

A terminal insertion hole 14 is formed in the recess 13 at an eccentric position, and the terminal 15 is inserted through the terminal insertion hole 14 and protrudes from the inside of the case 11 to the outside of the base 12.
3 is divided into a wide portion 16 and a narrow portion 17 by a terminal 15.

The terminal insertion hole 14 is formed in a tapered shape with an inclined surface 26 that gradually becomes wider from the communicating portion with the recess 13 toward the inside of the base 12 (downward in FIG. 2).

Further, at the bottom of the wide portion 16 of the recess 13, a narrow portion 1 is provided.
A downwardly inclined tapered surface 18 is formed on the 7 side.

19 is a sealing material filled in the recess 13 and made of thermoplastic or thermosetting synthetic resin.

In the above configuration, since the recess 13 filled with the sealant 19 is divided into a wide part 16 and a narrow part 17 by the terminal 15, the sealant 19 can be injected into the wide part 16. This makes the injection work of the sealing material 19 extremely easy, and automatic injection becomes possible.

Also, apply sealant 1 to excess parts such as the soldered part of the terminal 15.
Since 9 does not stick, it improves soldering workability, prevents overheating of the terminal 15, and prevents sealing material 19 from heat shock.
Prevents thermal deterioration and improves sealing performance.

Furthermore, since the dimension W of the narrow portion 17, that is, the gap between one side of the terminal 15 and the inner surface of the recess 13, is extremely small, the sealing material 19 rises within the narrow portion 17 due to capillary action. Sealing performance is improved by making the sealing level of the wide part 16 higher than that of the wide part 16.

In this case, the sealing material 19 also tries to flow into the base 12 by capillary action, but since the terminal insertion hole 14 is formed so that it gradually becomes wider toward the inside of the base 12, the terminal insertion hole 14 is There is no substantial gap between the hole 14 and the terminal 15, so the sealing material 19 fills the recess 13.
Inward flow due to capillary action is prevented even at the bottom of the terminal insertion hole 14, that is, the narrowest part of the terminal insertion hole 14.

As a result, the capillary phenomenon occurs concentratedly in the narrow portion 17, and the sealing material 19 injected into the wide portion 16 reliably rises within the narrow portion 17, ensuring a sufficient sealing level in the narrow portion 17. Therefore, incomplete sealing due to insufficient sealing material can be eliminated.

Moreover, as a result of being able to prevent the sealing material 19 from flowing inward, it is possible to prevent the sealing material from adhering to internal parts, etc., thereby preventing malfunctions.

In the above embodiment, since the tapered surface 18 is formed at the bottom of the wide part 16 of the recess 13 and is inclined downward toward the narrow part 17, the seal injected into the wide part 16 of the recess 13 The material 19 smoothly flows toward the narrow portion 17 side.

FIG. 3 shows a modification of this invention, in which the wide part 1 of the recess 13
6 and the narrow portion 17 are connected via a communication path 20,
The terminal 15 protrudes from the narrow portion 17.

Therefore, the opposing distance between the outer circumferential surface of the terminal 15 and the inner circumferential surface of the narrow portion 17 is all reduced, and from the wide portion 16 to the communicating path 2.
The sealing material 19 that has flowed into the narrow portion 17 through the terminal 15 has a high sealing level due to the capillary phenomenon that occurs on the entire outer circumferential surface of the terminal 15, thereby making it possible to perform an appropriate seal.

As described above, according to this invention, the recess formed in the base is divided into a wide part and a narrow part by the terminal inserted into the terminal insertion hole, and the sealing material is injected into the wide part. Therefore, the injection work of the sealant is easy and it is possible to prevent the sealant from adhering to the terminals.

Moreover, since the terminal insertion hole is gradually made wider from the communicating part with the recess toward the inside of the base, the capillary action of the sealing material filled in the recess stops at the bottom of the recess, sealing the inside of the base. This prevents the material from entering and allows the capillary action to concentrate in the narrow part of the recess.

As a result, it is possible to further promote the capillary phenomenon in the narrow part, maintain a high level of sealing in the narrow part, and obtain good sealing performance. It has the effect of preventing

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing an embodiment of the terminal sealing device according to this invention, Fig. 2 is an enlarged sectional view taken along the line 2-2 in Fig. 1, and Fig. 3 is a partial view showing a modification of this invention. The enlarged plan view and FIG. 4 are sectional views of the conventional example. 12...Base, 13...Recess, 14
...Terminal insertion hole, 15...Terminal, 16
...Wide part, 17...Narrow part, 19.
...Sealing material, 26...Slope surface.

Claims (1)

[Claims for Utility Model Registration] A recess that opens outward is formed in the base, a terminal insertion hole that communicates with the recess and opens inward of the base, and a terminal is inserted into the terminal insertion hole. In the terminal sealing device in which the terminal is inserted into the terminal and a sealing material is injected into the recess, the recess is divided into a wide part and a narrow part by the terminal, and the sealing material can be injected from the wide part. In addition, the terminal sealing device is characterized in that the terminal insertion hole is formed in a tapered shape that gradually becomes wider toward the inside of the base from the communicating portion with the recess.