JPH0736419U - Cast Transformer - Google Patents

Abstract

(57) [Abstract] [Purpose] In a case where a transformer main body with insulating tape wound around the winding is housed in a case and resin is injected and filled into the case, the adhesion between the resin and the winding is improved. Provides an enhanced casting transformer. [Structure] In the case, windings 3 and 5 are wound around a winding body portion 1a of a coil bobbin 1, an insulating tape 4 is wound around outer circumferences of the windings 3 and 5, and an iron core 6 is incorporated. In a casting transformer in which a transformer main body is housed and a resin 8 is filled inside, the insulating tape 4 has a tape-shaped tape sticking portion 4b on its inner surface, which is narrow and narrow in width relative to the tape width.
The configuration is provided in.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a small-sized transformer for consumer use, more specifically to a casting transformer in which the transformer body is sealed with resin.

[0002]

[Prior art]

 Conventionally, this type of transformer generally uses an insulating tape 4'as shown in FIG. 4 in which a tape adhesive portion 4b 'is provided on almost the entire inner surface of the tape 4a'. That is, FIG. 4 shows a cross section of the casting transformer, in which the lower winding 3'and the upper winding 5'are wound around the winding body 1a 'of the coil bobbin 1', but on the outer periphery thereof. The insulating tape 4'having the above structure is wound.

Then, the transformer main body thus assembled is housed in the case 7 ', and the inside thereof is filled with the resin 8', so that the casting transformer is manufactured.

[0004]

[Problems to be solved by the device]

 However, in this case, the tape adhesive portion 4b 'is provided on almost the entire inner surface of the insulating tape 4', and since the insulating tape 4'is provided over almost the entire width of the windings 3 ', 5', the resin It is difficult for 8'to enter the windings 3 ', 5'sides, the adhesiveness between the resin 8'and the respective windings 3', 5'is poor, and a tape adhesive portion 4b 'is provided to facilitate the entry of the resin 8'. It is sufficient to use a tape that is not available, but this has the problem that the workability of the tape is reduced when it is wound.

The present invention has been proposed in view of the above points, and an object thereof is to house a transformer main body in which an insulating tape is wound around the outer circumference of a winding in a case and inject resin into the case. -For filling, a casting transformer with improved adhesion between resin and winding is to be provided.

[0006]

[Means for Solving the Problems]

 According to the present invention, the windings 3 and 5 are wound around the winding body 1a of the coil bobbin 1, the insulating tape 4 is wound around the outer circumference of the windings 3 and 5, and the iron core 6 is incorporated in the case. In a casting transformer in which the main body of the transformer is housed and the resin 8 is filled therein, the insulating tape 4 is provided on the inner surface thereof, and the tape-shaped tape adhesive portion 4b having a narrower width than the tape width is provided on the tape 4a. The above-mentioned purpose is achieved.

[0007]

[Action]

 In the present invention, since the tape adhesive portion 4b that adheres to the windings 3 and 5 is provided on the inner surface of the tape 4a, the workability of winding the insulating tape 4 is not impaired.

Further, in this case, since the tape adhesive portion 4b is made of a thin strip and is provided substantially in the center of the inner surface of the tape 4a, the resin 8 is wound on both sides of the tape 4a. It can easily enter the 4 side, thus improving the adhesion between the resin 8 and the windings 3, 5.

[0009]

【Example】

 FIG. 1 shows an embodiment of the present invention. In the figure, reference numeral 1 is a resin coil bobbin, and this coil bobbin 1 is provided with a winding barrel portion 1a and flanges 1b integrally provided at both ends thereof. A thick portion 1c is formed in a part of one of the flanges 1b, and a plurality of pin terminals 2 are planted therein.

Reference numeral 3 denotes a lower winding, which is wound on the winding drum portion 1 a, and after winding this winding, the insulating tape 4 is wound.

As shown in FIG. 2, the insulating tape 4 has a thin film-shaped tape 4a provided with a thin strip-shaped tape adhesive portion 4b substantially at the center of the inner surface thereof. Therefore, during winding, the tape adhesive portion 4b is adhered to the winding 3, so that the winding workability is good and the insulating tape 4 is not displaced. The width of the tape adhesive portion 4b is determined to be the optimum width with respect to the width of the tape 4a, and is usually in the range of 2 mm to 10 mm.

The insulating tape 4 is provided across a pair of flanges 1b that are spaced apart from each other and are opposed to each other, so that the winding 3 is prevented from being broken. It also serves as an interlayer tape, on which the upper winding 5 is wound.

After that, the insulating tape 4 is wound around the outer periphery thereof, and the EE type or EI type iron core 6 is incorporated. As is well known, the lead wires (not shown) of the windings 3 and 5 are entangled with the roots of predetermined pin terminals 2 and then soldered to ensure electrical connection. The transformer body is assembled in this way.

Next, the transformer main body is housed in the case through the opening 7 a of the case 7 having a cylindrical shape with a bottom and an appropriate shape, and a resin 8 such as an epoxy resin is injected into the case.

The injected resin 8 enters the windings 5 and 3 side through the gap between both sides of the insulating tape 4 and the inner surface of the flange 1b. In this case, since the tape adhesive portions 4b are not provided to both ends of the insulating tape 4, the resin 8 is smoothly permeated, the resin 8 is filled around the windings 5 and 3, and the windings 5 and 5 are filled. Stick with 3. In the above description, the tape adhesive portion 4b is provided at the substantially central portion of the tape 4a. However, the tape adhesive portion 4b may be offset to the right or left side.

FIG. 3 shows an example of a casting transformer that is different from the above-described embodiment in the shape of the coil bobbin 1A and is constructed by using a case 7A having a shape corresponding thereto. Thus, this proposal can be applied to each shape. Since the other basic configurations are the same, the same parts are denoted by the same reference numerals, and detailed description thereof will be omitted.

[0017]

[Effect of device]

 As described above, according to the present invention, since the tape adhesive portion 4b is provided, there is no particular hindrance to the work of winding the insulating tape 4, and the tape adhesive portion 4b is larger than the tape width. Since the width is narrow, the resin 8 can be filled around the windings 5 and 3 and can be closely adhered thereto.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a casting transformer according to an embodiment of the present invention.

FIG. 2 is an explanatory view of an insulating tape used in the present invention.

FIG. 3 is another example of the casting transformer of the present invention.

FIG. 4 shows a conventional example.

[Explanation of symbols]

 1, 1A Coil bobbin 1a Winding body 1b Flange 1c Thick part 2 Pin terminal 3 Winding 4 Insulating tape 4a Tape 4b Tape adhesive part 5 Winding 6 Iron core 7,7A Case

Claims (1)

[Scope of utility model registration request] 1. A winding (3), (5) is wound around a winding body (1a) of a coil bobbin (1) in a case, and an insulating tape is provided on the outer periphery of the winding (3), (5). (4) is wound,
In addition, in a casting transformer that houses a transformer main body in which an iron core (6) is incorporated and is filled with a resin (8), the insulating tape (4) has a thin strip shape on the inner surface, which is narrower than the tape width. Tape adhesive part (4b) is tape (4a)
Casting transformer characterized by being provided in.