JPH08213255A - Transformer - Google Patents

Abstract

PURPOSE: To mutually fix each iron piece of the core of a transformer without using any impregnation agent and to prevent the beat of the transformer on conduction. CONSTITUTION: Polyester one-side adhesive tape 19 is applied to an iron piece lamination surface 16a of an EI-type core 16. Circular holes 20, 20... are provided nearly uniformly at the polyester one-side adhesive tape 19 and an iron piece lamination surface 16a is exposed from the circular holes 20, 20.... Thus, by applying acryl 2-liquid adhesive 21 to the exposed part, each E-type core and I-type core of the EI-type core 16 are mutually fixed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transformer, and more particularly to a transformer in which iron pieces of a core are fixed by using an adhesive without using an impregnating agent.

[0002]

2. Description of the Related Art In a conventional transformer of this type, after a winding step and a core inserting step, a polyester tape is attached to each iron piece laminated surface of the core and impregnated with an impregnating agent such as varnish or wax to remove each iron piece. By fixing them to each other, we are trying to prevent humming when energized. Since the impregnating agent is at high temperature and emits flammable, toxic, and malodorous gas, in addition to the assembly equipment that normally performs the winding step and core inserting step, an impregnating equipment is separately provided to perform the core inserting step. After that, it is sent to the impregnation equipment for impregnation. In the procedure of the impregnation step, first, the core is heated so that the impregnating agent is easily glued, and then the impregnation tank is impregnated. Then, after the impregnation is completed, it is pulled out of the impregnation tank and left for a while to dry and cool.

In some cases, the iron pieces of the core are connected to each other by electric welding in addition to the impregnation.

[0004]

When passing through the impregnation step, an additional impregnation facility is required in addition to the assembly facility.
Since a series of operations such as heating, impregnation, and drying / cooling in the impregnation step requires about 2 hours, the transformer assembly cannot be made into a line. In addition, the high heat, flammability, toxicity, and odorous gas generated from the impregnating agent adversely affect not only the characteristics of the product itself but also the surrounding environment. Furthermore, the in-line process does not proceed because the storage time is required for 24 to 48 hours. On the other hand, electric welding is complicated and the running cost increases.

Therefore, there arises a technical problem to be solved in order to fix the core iron pieces to each other by means other than electric welding without passing through the impregnation step, and the present invention solves the problem. The purpose is to

[0006]

The present invention has been proposed in order to solve the above-mentioned problems, and a hygroscopic pressure-sensitive adhesive tape is attached to each iron piece laminated surface of the core, and the hygroscopic pressure-sensitive adhesive tape is A transformer is provided in which holes are formed substantially uniformly and an acrylic two-component adhesive is applied from the holes to the iron piece lamination surfaces of the cores to fix the iron piece lamination surfaces of the cores to each other. is there.

[0007]

After the winding step and the core inserting step, a hygroscopic adhesive tape is attached to each iron piece laminated surface of the core. Since the holes in the hygroscopic pressure-sensitive adhesive tape are formed substantially uniformly, the laminated surfaces of the iron pieces are exposed through the holes. Therefore,
The iron pieces of the core are fixed to each other by applying an acrylic two-component adhesive to the exposed portion and curing it.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to FIGS. FIG. 1 is an exploded perspective view of a power transformer 1 for an AC adapter as an example of a transformer. AC power input plugs 3 and 4 are vertically provided under a bobbin 2 made of synthetic resin, and a left AC power input plug 3 is attached to the AC power input plug 3. After the connected primary coil 5 is wound around the winding chamber 6 below the bobbin 2,
It is connected to the AC power supply input plug 4 on the right side via a fuse 7. Further, a protruding piece 8 is provided on the rear side of the upper surface of the bobbin 2.
And three L-shaped terminals 9 and 1 on the protruding piece 8.
0 and 11 are planted. Then, one secondary coil 12 is connected to the terminal 9, and yet another one secondary coil 13 is connected to the terminal 10. Both of the secondary coils 12 and 13 are located above the bobbin 2. After being wound in the winding chamber 14, the secondary coil 12 coming out of the terminal 9 is
The secondary coil 13 connected to the terminal 11 and connected to the terminal 11 is connected to the terminal 11. Thus, the power supply voltage taken from the AC power supply input plugs 3 and 4 is transformed by the primary coil 5 and the secondary coils 12 and 13 and output from the terminals 9, 10 and 11.

On the other hand, a square hole 15 is opened at the top and bottom of the bobbin 2. Then, the EI core 16 is attached to the bobbin 2 through the square hole 15. The EI core 1
6 is composed of E-shaped iron pieces 17, 17 ... And I-shaped iron pieces 18, 18 ... As many as to completely fill the square holes 15, and these E-shaped iron pieces 17, 17 ... And I-shaped iron pieces 18, 18 ...
Is formed by stamping a thin silicon steel plate. Further, the left and right vertical pieces 17a and 17a, 17a and 17a of the E-shaped iron pieces 17, 17 ... And the central vertical piece 1
7b, 17b ... Are formed so that the length thereof is equal to the height of the bobbin 2, and the left or right vertical piece 1 is formed.
The distance between 7a or 17a, 17a or 17a ... and the central vertical pieces 17b, 17b ... Is formed so as to be equal to the distance from the left and right ends of the bobbin 2 to the hole edge of the square hole 15, and The width of the central vertical pieces 17b, 17b ... Is formed so as to be equal to the left and right widths of the square hole 15.

Therefore, when the central vertical pieces 17b, 17b ... Are inserted vertically into the square hole 15 and the horizontal pieces 17c, 17c ... of the E-shaped iron pieces 17, 17 ... Are brought into contact with the upper surface or the lower surface of the bobbin 2. , The central vertical pieces 17b, 17b ... and the left and right vertical pieces 17a and 17a, 17a and 17a ... on the opposite side to the side connected to the horizontal pieces 17c, 17c. Or it will be located on the same plane as the top surface. Then, the lateral pieces 17c, 1
By contacting the I-shaped iron pieces 18, 18 formed in the same size as 7c, the flow flows upward or downward in the square hole 15 and splits in the left and right direction at the upper or lower opening of the square hole 15. Thus, two magnetic circuits are formed that go around the left and right outer sides of the primary coil 5 and the secondary coils 12 and 13 and meet at the lower opening or the upper opening of the square hole 15.

The E-shaped iron pieces 17, 17 ... And the I-shaped iron pieces 18, 18 ...
Staggered inserts are stacked. Further, only the E-shaped iron pieces 17, 17 are inserted in the foremost stage and the last stage.

FIG. 2 shows a polyester single-sided adhesive tape 19, and the polyester single-sided adhesive tape 19 has circular holes 20, 20 ... The holes formed in the polyester single-sided adhesive tape 19 are the circular holes 2
It is not limited to 0, 20 ..., It may be opened in a slit shape.

Then, as shown in FIG. 3, the polyester single-sided adhesive tape 19 is adhered to the entire circumference of the iron piece laminated surface 16a of the EI-shaped core 16 in the vertical and horizontal directions. Then, as shown in FIG. 4, the acrylic two-component adhesive 2 is applied to the iron piece laminating surface 16a exposed at the back of the circular holes 20, 20 ...
Apply 1. The acrylic two-component adhesive 21 has a quick-drying property, a sufficient adhesive force with respect to silicon steel, and a low viscosity so that it has a high permeability. Further, since the polyester one-sided adhesive tape 19 has good hygroscopicity, the acrylic two-component adhesive 21 is deep in the gap between the E-shaped iron pieces 17, 17 ... And the I-shaped iron pieces 18, 18 ... Hardens while diffusing, and each E-shaped iron piece 1
7 and 17 and I-shaped iron pieces 18 and 18 are fixed to each other. Thus, the production of the AC adapter power transformer 1 is completed.

Here, the acrylic two-component adhesive 21
The test conducted by the inventor with respect to the characteristics will be described. The inventor prepared 10 transformers (Applicant's product model number R1285X) that went through the winding process and the core insertion process, and applied a trace amount of acrylic two-component adhesive to 2 of them and left 8 2 times as much acrylic as above for each 2
After applying a liquid adhesive and adhering the iron pieces of the core to each other, these transformers are respectively welded into an outer casing for AC adapter (Applicant product model number ADP-35J12. Material: PPE polyphenylene ethanol). First, when the presence or absence of abnormal noise and beating of core peeling was checked, neither of the core peeling, abnormal noise nor beating was confirmed in all of the 10 transformers.

Next, these transformers, together with the outer casing for AC adapter, were dropped 6 times from a height of 1.5 m, respectively, and then checked for snarls and abnormal noises. Beating occurred in one of the two transformers coated with the sexual adhesive, but neither the beat nor the abnormal noise was confirmed in the other nine transformers. From this, it was found that when an appropriate amount of acrylic two-component adhesive was used according to the type of transformer, no beat or noise was generated. Further, after the acrylic two-component adhesive was applied, the time until the surface was dried was about 20 minutes.

Therefore, when the iron pieces of the core are fixed to each other by the impregnation step to prevent the beat of the transformer, after the winding step and the core insertion step, the impregnation step takes about 2 hours to complete the transformer. However, according to the present invention, the 2 hours can be shortened to 20 minutes, and the beat can be prevented as in the case of impregnation. Moreover, since only the adhesive is applied and no impregnation equipment such as an impregnation tank is required, the core iron pieces can be directly bonded on the assembly line where the winding process and the core inserting process are performed, and one line Not only can it be realized, but also a significant cost reduction can be achieved.

The present invention can be modified in various ways without departing from the spirit of the present invention, and it goes without saying that the present invention extends to such modifications.

[0018]

As described in detail in the above one embodiment, the present invention replaces the impregnation step by using a hygroscopic pressure-sensitive adhesive tape having substantially uniformly opened holes and an acrylic two-component adhesive. Meanwhile, the iron pieces of the core can be fixed to each other easily and in a short time, and the beat of the transformer can be prevented.
Further, the transformer can be assembled in one line together with the winding process and the core inserting process, which is extremely efficient and can significantly reduce the cost. Furthermore,
This is an invention that has various kinds of effects, such as little influence on the environment and products as when impregnation is performed.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of a transformer.

FIG. 2 is a plan view showing an embodiment of the polyester single-sided adhesive tape according to the present invention.

FIG. 3 is a perspective view showing a state in which a polyester single-sided adhesive tape is being attached to each iron piece laminated surface of the core.

FIG. 4 is a perspective view showing an embodiment of the present invention.

[Explanation of symbols]

 1 AC Adapter Power Transformer 2 Bobbin 5 Primary Coil 12, 13 Secondary Coil 15 Square Hole 16 EI Type Core 16a Iron Piece Laminated Surface 17 E Type Iron Piece 18 I Type Iron Piece 19 Polyester One Side Adhesive Tape 20 Circular Hole 21 Acrylic Two-Liquid adhesive

Claims (1)

[Claims] 1. A hygroscopic pressure-sensitive adhesive tape is adhered to each iron piece laminated surface of the core, and the hygroscopic pressure-sensitive adhesive tape is provided with substantially uniform holes, and an acrylic two-component adhesive is applied from the holes. A transformer characterized in that the iron piece lamination surfaces of the core are fixed to each other by applying the iron piece lamination surfaces of the core.