JPH0739209Y2 - Mold transformer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to an improvement of a mold type transformer.

[Prior Art] FIG. 2 is a sectional view showing a configuration of a conventional rubber mold type transformer. In this figure, (1) is a base plate, (2) is an iron core supported by the base plate, (3) is a secondary coil wound around the iron core, and (4) is a secondary coil via an insulating material (5). Primary coils wound around the outer circumference of the coil, (6) and (7) are primary terminals connected to the lead-out portion (not shown) of the primary coil,
The outer ends (6A) (7A) extend substantially horizontally on both sides of the primary coil. (6B) and (7B) are holes for connection provided at the outer end of the primary terminal, (8) is a molding material, which is made of synthetic resin such as epoxy resin, EPT rubber, liquid rubber, or the like. , Primary coil (4), secondary coil (3)
And a part of the primary terminals (6) and (7). Particularly, regarding the portion covering the primary terminals (6) and (7), the exposed portion of the primary terminals (6) and (7) and the molding material (8).
In order to prevent moisture from entering the mold from the boundary with the molding material (8), the primary terminal (6) is kept for a predetermined length.
A protrusion (8A) is formed extending along (7) so that the primary terminals (6) and (7) and the molding material (8) are in close contact with each other.

[Problems to be solved by the device]

The conventional mold type transformer is constructed as described above. However, since the tensile force acts toward the center due to the shrinkage of the molding material (8) after molding, the primary terminal (6 (7) There is a problem that peeling occurs at the boundary between the protruding portion (8A) of the molding material (8) and the gap between the peeled portions is filled with an adhesive or the like.

The present invention has been made in order to solve such a problem, and an object thereof is to provide a mold type transformer capable of improving the adhesion between the primary terminal and the molding material and improving the moisture resistance reliability. .

[Means for Solving the Problems]

The mold transformer according to the present invention is such that a hole is formed in the primary terminal of the portion covered by the projecting portion of the mold material, and the hole is filled with the mold material.

[Action]

According to this invention, the hole of the primary terminal is filled with the molding material, and the molding material on the upper surface side of the primary terminal and the molding material on the lower surface side are coupled through the hole, so that the adhesion between the molding material and the primary terminal is improved. Will become stronger.

[Embodiment of the Invention] An embodiment of the invention will be described below with reference to FIG.
This figure shows the cross section of the embodiment, and in the figure (10
A) and (10B) are holes provided in the portions of the primary terminals (6) and (7) that are covered by the protrusions (8A) of the molding material (8), and when molding with the molding material (8). (8) is filled from above and below, and the primary terminals (6) and (7)
The molding material on the upper surface side and the molding material on the lower surface side are coupled through this hole. Therefore, the molding material (8) firmly adheres to the primary terminals (6) and (7) also at the protruding portion (8A). Other configurations are the same as the conventional ones, and thus the description thereof is omitted.

[Effect of device]

As described above, according to the present invention, the hole is formed in the primary terminal of the portion covered by the protruding portion of the molding material, and the molding material is filled in this hole. Therefore, at the boundary between the primary terminal and the molding material. Moisture resistance reliability can be improved without peeling.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention, and FIG. 2 is a sectional view showing the structure of a conventional mold type transformer. In the figure, (2) is an iron core, (3) is a secondary coil, and (4)
Is a primary coil, (6) and (7) are primary terminals, (8) is a molding material, and (10A) and (10B) are holes. In the figure, the same reference numerals indicate corresponding parts.

Claims (1)

[Scope of utility model registration request] 1. A primary coil and a secondary coil wound around an iron core, and a primary terminal connected to the primary coil. A part of the primary terminal and both coils are covered with a molding material, and the mold is formed. In a portion of the material where the primary terminal is exposed, a protrusion is formed in the extending direction of the primary terminal by a predetermined length, the primary terminal of the portion covered by the protrusion of the molding material. A mold-type transformer, characterized in that a hole is formed in the hole and the hole is filled with a molding material.