JPH0122362Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a bell mouth used for mitigating electric fields during cable termination.

[Technical background of the invention]

The epoxy bell mouth is constructed as shown in FIG.

First, by casting epoxy resin, one side
is conical, and has a conical cylinder part 3 protruding from the outer circumferential cylinder part 2 at the center of the other surface, and an annular recess part 4 that smoothly extends to the base and has an approximately semicircular arc cross section. do. Next, the cylindrical portion 3 circumferential surface,
A conductive film 6 is formed on the inner circumferential surface of the recess 4 and the outer cylinder 2 by applying a conductive paint, and a conductive wire 7 made of tin-plated annealed copper wire is fixed to this film with a conductive adhesive 8 such as silver paint. A filling material is poured into the recess 4 and solidified to form a fixing layer 9 to fix the conductive wire 7.

On the other hand, the fixed layer 9 is formed of epoxy resin or the like similarly to the base body 5, but cannot be cast together with the base body 5 at the same time. For this reason, when filling the concave portions 4 of the base 5 with the epoxy resin forming the fixed layer 9, it is necessary to reduce the amount of filler added to the epoxy resin to lower its viscosity.
However, if the amount of filler added to the epoxy resin is reduced, the materials of the base 5 and the fixed layer 9 will be different. Furthermore, the epoxy resin that forms the fixed layer 9 and the conductive paint such as silver paint that forms the film 6 are different materials, and the film 6 itself does not have adhesive properties, so the two are not completely adhered to each other. It is in.

[Problems with background technology]

Since the materials of the base 5 and the fixing layer 9 are different, there is a difference in the coefficient of thermal expansion between the two, and since the fixing layer 9 is not completely adhered to the coating 6, repeated thermal expansion and contraction causes separation between the two, and the final In this case, both the conductive wire 7 and the fixed layer 9 fall off from the base body 5. This resulted in incomplete fixation and shielding of the epoxy bell mouth, resulting in a disadvantage of reduced performance.

[Purpose of invention]

The present invention was developed based on the above-mentioned circumstances, and aims to provide a bell mouth with no fear of the fixed layer falling off.

[Summary of the idea]

In the present invention, a recessed part that bulges toward the outer periphery of the outer peripheral cylinder part is formed on the inner periphery of the outer peripheral cylinder part, and the fixing layer is completely contained in the recessed part,
The above objectives have been achieved.

[Example of idea]

In FIG. 2, in which the same parts as those in FIG.

In the epoxy bell mouth of the present invention having the above structure, the portion 9a that has entered into the groove 10 and solidified supports the fixing layer 9, so even if peeling occurs between the coating 6 and the fixing layer 9, the fixing layer 9 will not fall off. There's no fear.

FIG. 3 shows another embodiment, in which the same parts as in FIGS. 1 and 2 are given the same reference numerals. In this example,
A side of the recess 4 on the outer circumferential cylinder part 2 side is bulged toward the outer circumference of the outer circumferential cylinder part 2.

In this embodiment, the fixing layer 9 cast into the recess 4 has a bulged portion that supports the fixing layer, so there is no risk that the fixing layer 9 will fall off even if peeling occurs.

[Effect of idea]

In the epoxy bell mouth of the present invention, there is no risk of the fixed layer falling off, so the support and shielding of the bell mouth will not be incomplete, and the performance of the bell mouth will not deteriorate.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional view of a conventional epoxy bell mouth.
2 and 3 are cross-sectional views of the first and second embodiments of the present invention. 2... Outer circumferential cylinder part, 4... Recessed part, 5... Base body, 6
... Film, 7 ... Conductive wire, 8 ... Conductive adhesive, 9
... fixed layer, 10 ... groove.

Claims (1)

[Scope of utility model registration request] A conical protrusion protruding axially outward from the outer circumferential cylindrical part and an annular recess smoothly connected to the conical protrusion are formed on the side surface of the base body, and a conductive coating is provided on the protrusion and the recess. A fixed layer is formed by fixing a conductive wire to the coating with a conductive adhesive and casting and solidifying a filler into the recess, in which the outer periphery is attached to the inner periphery of the outer cylindrical part within the space where the filler is cast. A bell mouth characterized by forming a concave portion that bulges toward the outer periphery of the cylindrical portion.