JPH0741136Y2 - Power transformer - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power transformer for consumer use, more specifically to a power transformer in which a cover is attached to a transformer body so that the transformer can be easily impregnated with resin.

[0002]

2. Description of the Related Art Generally, a transformer body is impregnated with a resin in order to ensure insulation from peripheral components. That is, conventionally, in this type of power transformer, as shown in FIG. 3, a transformer main body 1 in which a coil 7 is wound around a coil bobbin 6 having a terminal 5 on a flange 2 and an iron core 8 is incorporated has an opening 11A. It is housed in the box-shaped cover 9A that it has, and then the cover 9A is filled with resin.

[0003]

In this case, it is necessary to fix the transformer main body 1 at a predetermined position inside the cover 9A, and the inner shape of the cover 9A becomes complicated. Further, when impregnating the resin tank filled with the resin with the cover 9A attached, the terminal 5 side is soaked up in the resin tank so that the resin does not adhere to the terminal 5. Has a bottomed portion 9a and is like a container. Therefore, if the cover 9A functions as a container after the impregnation and is pulled up from the resin tank, there is a problem that excess resin accumulates in the cover 9A. there were.

The present invention has been proposed in view of the above, and an object thereof is to easily attach a cover to the transformer main body, fix the cover at a predetermined position, and easily perform impregnation. Another object of the present invention is to provide a power transformer that can prevent excess resin from being accumulated in the cover after impregnation.

[0005]

According to the present invention, an engaging portion 4a is formed on one flange 2 of a coil bobbin 6 constituting a transformer body 1, and a cover 9 attached to the coil bobbin 6 is provided with the engaging portion 4a. Is formed on the side of the cover 9 opposite to the side where the cover 9 is attached to the coil bobbin 6.
The above-described object is achieved by forming the opening 12 through which the resin 14 impregnated with is freely movable.

[0006]

In this invention, since the engaging portion 4a is formed on the flange 2 of the coil bobbin 6 constituting the transformer body 1 and the engaging hole 10 which is engageable with the engaging portion 4a is formed on the cover 9, the transformer body is formed. When the cover 9 is mounted so as to cover the periphery of 1, the engaging hole 10 engages with the engaging portion 4a, and the cover 9 can be mounted and fixed at a predetermined position of the transformer main body 1 and very easily. I am trying.

Since the cover 9 has an opening 12 on the opposite side of the opening 11 for inserting the transformer main body, when the terminal 5 is faced upward and immersed in the resin tank 13, the cover 9 is opened through the opening 12. The resin 14 quickly enters the inside, and the transformer body 1 can be impregnated in the resin.
When pulled up, the excess resin 14 in the cover 9 flows down from the opening 12 into the resin tank 13.

[0008]

1 shows an embodiment of the present invention. In the figure, reference numeral 1 denotes a transformer body, and the transformer body 1 has flanges 2 and 3 at both ends, and a plurality of terminals 5 projecting downward in the illustrated state are planted in a thick portion 4 of one flange 2. The coil bobbin 6, the coil 7 wound around the coil bobbin 6, and the iron core 8 incorporated in the coil bobbin 6 having the coil 7 are provided. Each lead wire of the coil 7 is entwined with a predetermined terminal 5 and soldered in a known manner. It should be noted that the transformer main body 1 may have a structure in which the coil bobbin 6 has various multi-divided structures other than the type in which the lower winding and the upper winding are wound around the single coil bobbin 6.

Therefore, on both sides of each side of the thick portion 4 of the flange 2 on the side where the terminal 5 of the coil bobbin 6 is implanted,
In the illustrated state, the engagement portions 4a each formed of a taper portion protruding downward from above are formed.

Reference numeral 9 in the drawing denotes a resin cover mounted around the transformer main body 1, and in this embodiment, it corresponds to the planar shape of the coil bobbin 6 and is formed into a simple substantially rectangular tube shape. There is. Further, a substantially rectangular engaging hole 10 that can engage with the engaging portion 4a is formed below the side portion of the cover 9 corresponding to the engaging portion 4a formed on the side portion of the flange 2. The positions of the engaging portion 4a and the engaging hole 10 are not limited to those in the illustrated embodiment, but may be other positions.

Below the cover 9, the transformer body 1 is provided.
An opening 11 for attachment to is formed, and an opening 12 is also formed on the opposite side.

When the cover 9 is attached to the transformer main body 1, if the cover 9 is covered with the transformer main body 1 as shown by the arrow, since the cover 9 is made of resin, it has some elasticity due to its material. Since it is deformed, the engaging hole 10 can be engaged with the engaging portion 4a, and the transformer body 1 can be attached and fixed at a predetermined position of the cover 9.

FIG. 2 shows a transformer body 1 with a cover 9 attached.
Shows a state in which the resin tank 13 is impregnated with, for example, an epoxy resin 14. That is, upon impregnation,
When the transformer main body 1 having the cover 9 is impregnated in the resin 14 with the terminal 5 side facing upward, the resin 9 is not covered by the cover 9.
Since the opening 12 through which the resin 4 can freely move in and out is formed, the resin 14 can be promptly introduced into the cover 9 through the gap between the cover 9 and the coil bobbin 6 to impregnate the resin main body 1 with the resin 14. After the impregnation, if the transformer main body 1 having the cover 9 is pulled up, excess resin in the cover 9 can be dropped and removed from the opening 12.

FIG. 3 shows another embodiment of the present invention. In this example, a part of a bottomed portion 9a corresponding to a so-called top plate of the cover 9 is cut off to form an opening 12. Opening 12
The shape of is not limited to a rectangle, but may be an ellipse or other shapes. Other configurations, operations and the like are similar to those of the above-mentioned embodiment.

As described above, according to the present invention, while the engaging portion 4a for mounting the cover 9 while positioning the cover 9 is formed on the coil bobbin 6, the cover 9 is also engageable with the engaging portion 4a. Since the joint hole 10 is formed, the cover 9 can be extremely easily attached and fixed to the coil bobbin 6, that is, the predetermined position of the transformer body 1. Further, the cover 9 may have a simple shape, and since the opening 12 through which the resin 14 can freely enter and exit is formed, the impregnation work is easy,
Moreover, after the impregnation, when the transformer main body 1 to which the cover 9 is attached is pulled up from the resin tank 13, the excess resin 14 can be removed from the opening 12 to the outside of the cover 9.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of an embodiment of the present invention.

FIG. 2 is an explanatory sectional view showing an impregnated state.

FIG. 3 is another embodiment of the present invention.

FIG. 4 shows a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Transformer body 2,3 Flange 4 Thick part 4a Engagement part 5 Terminal 6 Coil bobbin 7 Coil 8 Iron core 9 Cover 10 Engagement hole 12 Opening part

Claims (1)

[Scope of utility model registration request] 1. An engaging portion 4a is formed on one flange 2 of a coil bobbin 6 constituting a transformer main body 1, and a cover 9 attached to the coil bobbin 6 can be engaged with the engaging portion 4a in correspondence with the engaging portion 4a. Forming the engagement hole 10,
A power transformer, characterized in that an opening 12 through which a resin 14 impregnating the transformer body 1 can freely enter and exit is formed on the side of the cover 9 opposite to the side where the coil bobbin 6 is attached.