JP2561720Y2 - Equipment with seal - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sealing device for sealing a terminal connecting portion of an electric wire with a sheet-like sealing material.

[0002]

2. Description of the Related Art As a conventional seal attaching device, for example, there is one as shown in FIG. 9 (JP-A-1-206573).
Reference). This apparatus includes upper and lower dies 1 and 3, and upper and lower dies 1 and 3 are provided with recesses 5 and 7, respectively. Then, the outer periphery of the elastic sheet 9 surrounding the connection portion to be sealed by the upper mold 1 and the lower mold 3 is pressed.

Here, the elastic sheet 9 will be described. The elastic sheet 9 is made of a PVC sheet, and has a viscous sealing material 11 in a mat shape on one surface as shown in FIG. The viscous sealing material 11 is, for example, butyl rubber (polyisobutylene + aluminum hydroxide + plasticizer) or the like. The connection part to be sealed is the connection terminal 15 of the electric wire 13. Then, as shown in FIG.
When the elastic sheet 9 and the viscous sealing material 11 are folded in two, the connection terminal 15 is positioned as shown in FIG.
Is surrounded by the viscous sealing material 11 and the elastic sheet 9. In this way, the elastic sheet 9 and the viscous sealing material 11 surrounding the connection terminals 15 are arranged between the upper mold 1 and the lower mold 3 as shown in FIG. 9, and pressure is applied as shown by arrow 17 in FIG. The outer periphery of the elastic sheet 9 is pressed between the mold 1 and the lower mold 3. By this pressing, the elastic sheet 9 is crushed as shown in FIG. 12, and is completed as shown in the sectional view of FIG.

In this state, the viscous sealing material 11 is
It is possible to bite around and between the terminals 3 and between and around the connection terminals 15 to waterproof the connection terminals 15.

[0005] In the above process, the upper mold 1
In addition, since the lower mold 3 is provided with the concave portions 5 and 7, the elastic sheet 9 is not excessively pressed by the connection terminal 15, and the elastic sheet 9 is prevented from being broken by the connection terminal 15. I can do it.

[0006]

However, in the above device, if the size of the connection terminal 15 has a certain size corresponding to the size of the concave portions 5 and 7 of the upper die 1 and the lower die 3, A desired state can be obtained. For example, as shown in FIGS.
If it is too small or too large, the following problem may be caused.

That is, when the connection terminal 15 is small as shown in FIG. 14, no pressing force is applied to the central portion of the elastic sheet 9 and the viscous sealing material 11 does not sufficiently penetrate into the terminal 15 to cause a problem in the sealing property. May occur.

If the connection terminal 15 is large as shown in FIG. 15, the elastic sheet 9 may be broken, which may cause dielectric breakdown.

More specifically, FIG.
FIG. 17 shows the winding state of the viscous sealing material 11 when the connection terminal 15 is large, and FIG. 17 shows the winding state of the viscous sealing material 11 when the connection terminal 15 is large. This figure 1
6, in FIG. 17, H ₁ and H ₂ indicate distances at which the viscous sealing material 11 cuts into the terminal center. In each case, no pressure was applied.

FIG. 18 shows the relationship between the pressing force and the bite amount of the viscous sealing material, and has a substantially directly proportional relationship as shown by the solid line in FIG. The figure broken line shows the pressure acting on the surface of the connection terminal 15 in the state of FIG. 15, during the 0 to P ₁ elastic sheet 9 between the upper and lower molds 1 and 3
Are not in contact with the concave portions 5 and 7, and between P _{1 and} P ₂ , the concave portions 5 and 7 compress the viscous sealing material 11 and pressure is directly applied to the connection terminals 15, and between P _{2 and} P ₃ Is the connection terminal 15
There is no space around the show pressurized state to push the viscous sealant 11 to H _2. As shown in this figure, it can be seen that a large pressing force W ₃ finally acts on the surface of the connection terminal 15.

Accordingly, when the connection terminals 15 is large as shown in FIG. 15 described above, this pressure W ₃ is there is a possibility that the elastic sheet 9 broken.

[0012] Therefore, the present invention aims to provide a seal attaching device capable of attaching an appropriate seal regardless of the size of a connection portion to be sealed.

[0013]

According to the present invention, there is provided an upper and lower mold having a viscous sealing material on one surface and pressing an outer periphery of an elastic sheet surrounding a connecting portion to be sealed. At least one of the upper and lower molds is characterized in that an intermediate portion corresponding to the connecting portion is formed of a soft material capable of compressing the viscous sealing material.

[0014]

When the outer periphery of the elastic sheet surrounding the connecting portion to be sealed is pressed by the upper and lower molds when the connecting portion is large, it corresponds to at least one of the upper and lower mold connecting portions. Since the soft portion of the intermediate portion bends according to the size of the connecting portion, an excessive load is not applied to the connecting portion. Further, since the degree of softness of the intermediate portion is such that the viscous seal material can be compressed, there is no problem in biting the viscous seal.

[0015]

Embodiments of the present invention will be described below.

FIGS. 1 and 2 show a sealing device according to an embodiment of the present invention. Also in this device, a connecting portion to be sealed is a connection terminal 15 of an electric wire. Since the provided viscous sealing material 11 is butyl rubber, the elastic sheet, the viscous sealing material, the electric wires and the connection terminals will be described using the reference numerals described in FIGS. This sealing device also includes an upper mold 21 and a lower mold 23. The upper mold 21 has, for example, a soft rubber 27 disposed in the center of a base 25 of a metal plate, and hard rubbers 29 on both sides.
Is arranged. The soft rubber 27 is stiffer than the viscous sealing material 11 described with reference to FIGS.
1 can be compressed. The hard rubber 29 is harder than the soft rubber 27, and is of such a degree that both ends of the elastic sheet 9 can be accurately suppressed.

The lower mold 23 has the same structure as the upper mold 21. A soft rubber 33 and a hard rubber 35 are provided on a base 31 of a metal plate.

As shown in FIG. 3, the connection terminal 15 is surrounded by the elastic sheet 9 and the viscous sealing material 11, and is disposed between the upper die 21 and the lower die 23 as shown in FIG.

Next, when a pressing force in the direction of arrow 37 is applied as shown in FIG. 2, the result becomes as shown in FIG. In this state, the outer surface of the elastic sheet 9 is pressed by the hard rubber 29, 35 at the portion of the electric wire 13, and the viscous sealing material 11 is
Around and between each other. Also, upper and lower dies 21, 23
At the center, the soft rubbers 27 and 33 bend in accordance with the size of the connection terminal 15, and the reaction force presses down the connection terminal 15, causing the viscous sealing material 11 to bite into and around the connection terminal 15. . Therefore, even if the connection terminal 15 is small, the viscous sealing material 11 can sufficiently penetrate into the inside of the connection terminal 15 and stable waterproof processing can be performed. In addition, soft rubber 27,3
The pressing force applied to the connection terminal 15 due to the flexure of 3 does not become excessive.

FIG. 5 shows a state in which the connection terminal 15 is large. Since the soft rubbers 27 and 33 increase in flexure in accordance with the size of the connection terminal 15, the pressure applied to the connection terminal 15 is as shown in FIG. Although it is slightly increased compared to the one, it does not become excessive. Therefore, even if the connection terminal 15 is large, the elastic sheet 9 can be prevented from being broken.

FIG. 6 shows the relationship between the pressing force and the bite amount of the viscous sealing material 11, and H ₁ and H ₂ are shown in FIGS.
7, the distance that the viscous sealing material 11 bites into the center of the terminal in the state of FIGS. 4 and 5 is shown. As shown by the solid line in the figure, the relationship between the amount of penetration of the viscous sealing material 11 and the pressing force is almost directly proportional. The broken line in the figure indicates the relationship between the pressing force applied to the terminal surface in the case of the large connection terminal 15 in FIG.
7 shows a case in which 7, 33 is further softened.
Accordingly, by adjusting the soft rubbers 27 and 33, it is possible to prevent the pressing force applied to the terminal surface from becoming excessive even in the case of the large connection terminal 15, and to reliably prevent the elastic sheet 9 from being broken. I understand.

FIGS. 7 and 8 show another embodiment. In this embodiment, for example, the upper mold 39 is formed of hard rubber or metal, and the lower mold 41 is formed of soft rubber 43 and hard 45. The soft rubber 43 is arranged on the opposite side of the upper mold 39, and the hard rubber 45 is arranged on both sides of the lower mold. Therefore, the intermediate portion corresponding to the lower connection terminal 15 has a structure that is soft enough to compress the viscous sealing material.

In this example, as shown in FIG. 8, the soft rubber 43 is bent so as to enter between the hard rubbers 45 at a portion corresponding to the connection terminal 15 at the time of pressurization, thereby preventing the connection terminal 15 from being applied with excessive pressure. be able to. Therefore, in addition to having substantially the same operation and effect as the above embodiment, the upper mold 39 can be designed freely, and the structure is simplified.

The present invention is not limited to the above embodiment. For example, in the embodiments of FIGS. 7 and 8, the structure of the upper die and the lower die can be reversed. In the embodiment shown in FIGS. 1 and 2, one of the upper mold 21 and the lower mold 23 may be entirely made of hard rubber or metal.

It is desirable to attach a silicon sheet or a Teflon sheet to the surface of the connecting terminal 15 or the like, which is in contact with the viscous sealing material 11, in order to prevent adhesion to the viscous sealing material butyl rubber and to improve the releasability. It is preferable to use silicon rubber as the viscous sealing material 11.

[0026]

As is clear from the above description, according to the structure of the present invention, the viscous sealing material can be reliably penetrated irrespective of the size of the connection portion to be sealed, and an excessive pressing force is applied to the connection portion. The action can be suppressed, and the elastic sheet can be prevented from being broken.

[Brief description of the drawings]

FIG. 1 is a perspective view according to an embodiment of the present invention.

FIG. 2 is a perspective view of a pressurized state.

FIG. 3 is an explanatory view of a viscous sheet and a viscous sealing material.

FIG. 4 is an operation explanatory view.

FIG. 5 is an operation explanatory view.

FIG. 6 is a graph showing a relationship between a pressing force and a bite amount of a viscous sealing material.

FIG. 7 is a perspective view according to another embodiment.

FIG. 8 is an explanatory diagram of the operation.

FIG. 9 is a perspective view according to a conventional example.

FIG. 10 is an explanatory view of an elastic sheet and a viscous sealing material according to a conventional example.

FIG. 11 is an operation explanatory view according to a conventional example.

FIG. 12 is an operation explanatory view according to a conventional example.

FIG. 13 is an operation explanatory view according to a conventional example.

FIG. 14 is an operation explanatory view according to a conventional example.

FIG. 15 is an operation explanatory view according to a conventional example.

FIG. 16 is an operation explanatory view according to a conventional example.

FIG. 17 is an operation explanatory view.

FIG. 18 is a graph showing a pressing force and a bite amount of a viscous sealing material.

[Explanation of symbols]

 9 Elastic sheet 11 Viscous sealing material 13 Electric wire 15 Connection terminal (connection part to be sealed) 21 Upper die 23 Upper die 25 Base 27 Soft rubber 29 Hard rubber 31 Base 33 Soft rubber 35 Hard rubber 37 Arrow 39 Upper die 41 Lower die

Claims (1)

(57) [Scope of request for utility model registration] An upper and lower mold having a viscous sealing material on one surface and pressing the outer periphery of an elastic sheet surrounding a connecting portion to be sealed is provided, and at least one of the upper and lower molds is provided on the connecting portion. A sealing device, wherein a corresponding intermediate portion is formed of a soft material capable of compressing the viscous sealing material.