JPH0510345Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to transformers used in various power supply equipment, video equipment, audio equipment, industrial equipment, etc.

Conventional technology A conventional transformer is shown in the perspective view of Fig. 4, the perspective view of Fig. 5,
It had a structure as shown in the cross-sectional view of FIG.
That is, a plurality of guide grooves 7 for passing a plurality of lead wires 6 are formed on the outer periphery of both end surfaces of the coil bobbin 1.
An enlarged part 3 having a plurality of terminals 5 implanted therein is provided on the left flange 2 and the right flange 3, and a middle flange 4 is provided in the center part. Furthermore, two pairs of notches 16 are provided on the coil side at both ends of the left flange 2 and the right flange 3. 1 for the above coil bobbin 1
The secondary coil 9 and the secondary coil 10 are wound, and the iron core 11 is assembled so as to surround the outer peripheral surface of the coil bobbin 1 to complete the coil portion 12. A protective case 14 protects a pair of plate-shaped insulating walls 13 that fit from the notch 16 of the left flange 2 to the notch 16 of the right flange 3.
The insulating wall 13 was passed through between the coil bobbin 1 and the iron core 11, and the coil part 12 was housed in a protective case 14.

Problems to be Solved by the Invention In the conventional structure described above, the insulating wall 13 of the protective case 14 is inserted between the coil bobbin 1 of the coil part 12 and the iron core 11 to be inserted therethrough. The insulating wall 13 did not fit into the notch 16 of the coil bobbin 1, making it impossible to secure the creepage and clearance distance of 2.0 mm between the primary coil 9, secondary coil 10 and iron core 11, which was the design goal, and was fully satisfied from a safety standpoint. It was hard to call it a trance that could do that. Insulating wall 1
3 is passed through the coil part 12, so the insulating wall 1
The occurrence of warpage in No. 3 had drawbacks such as a significant deterioration in workability.

Means for Solving the Problems In order to solve the above problems, the present invention provides a method for winding a coil around a coil bobbin having flanges at least on both ends with notches on the coil side, and surrounding the outer peripheral surface of the coil bobbin. As shown in the figure, an iron core is assembled to form a coil part that becomes the transformer body, an inclined part is formed at the upper end, and a plurality of convex ribs are provided that contact the inner surface of the iron core to connect the coil bobbin of the coil part and the iron core. The inner surface is provided with a pair of plate-shaped insulating walls that are inserted between the two and fit into the notches of the collar.

Function As mentioned above, since the insulating wall has a sloped part, when the coil part is stored in the protective case, the sloped part of the insulating wall acts as a guide, and the slope part of the insulating wall acts as a guide. The convex ribs act on the iron core from plate-like surface contact to linear contact, making it easier to insert the coil part. After insertion, the convex rib hits the iron core and receives stress in the direction of pressing the insulating wall toward the coil bobbin, so that the insulating wall can be completely fitted into the notch provided in the coil bobbin.

Embodiment An embodiment of the present invention will be described below with reference to the drawings. The perspective view of FIG. 1 and the cross-sectional views of FIGS. 2 and 3 each show an embodiment of the present invention. That is,
A left flange 22 and a right flange 23 are provided on the outer periphery of both end faces of the coil bobbin 21, and a middle flange 24 is provided in the center thereof. The left flange 22 and the right flange 23 have a plurality of guide grooves 27 through which a plurality of lead wires 26 are passed, and are provided with an enlarged portion 28 in which a plurality of pin terminals 25 are implanted. Two pairs of notches 36 are provided at both ends of the coil 23 on the coil side, into which the insulating walls 33 integrated with the protective case 34 are fitted. A primary coil 29 and a secondary coil 30 are wound around the coil bobbin 21, and an EE type or EI type iron core 31 is assembled to surround the coil bobbin 21 to form a coil portion 32 which becomes a transformer body. A pair of plate-shaped insulating walls 33 are formed on the inner surface of the protective case 34 at positions that fit into the notches 36 provided in the coil bobbin 21. The insulating wall 33 is formed integrally with the protective case 34, and has a shape with a sloped portion 38 at the open end. The angle of inclination can be arbitrary, but
The higher one is at a position slightly lower than the bottom surface of the protective case 34, and the lower one is such that it reaches the bobbin base 39 of the coil bobbin 21 when the coil part 32 is assembled in the protective case 34. Here, the inclined part 38
A recess 37 in the center is provided with an ejection pin for ejecting the protective case 34 from the mold during molding. Further, on the surface of the insulating wall 33 that is in contact with the iron core 31 side, from a position lower than the upper end of the insulating wall 33 to the inner bottom surface of the protective case 34, a layer of 3/1 or more of the stacking thickness of the iron core 31 is applied. A plurality of convex ribs 35 having a length and an arbitrary width are provided. Using the inclined part 38 provided at the upper end of the insulating wall 33 as a guide, the insulating wall 3
3 and insert the coil part 3 into the protective case 34.
2 is housed to complete the transformer. At this time,
The convex rib 35 of the insulating wall 33 comes into contact with the inner surface of the iron core 31, and the insulating wall 33 is pushed toward the coil bobbin 21 and tightly fits into the notch 36 of the coil bobbin 21.

Effects of the Invention As described above, in the transformer of the present invention, the inclined part provided at the upper end of the insulating wall acts as a guide, and the contact surface between the insulating wall and the iron core is connected to the convex part provided on the insulating wall. Due to the effect of the shaped ribs, the plate-like surface contact changes to a line contact of the convex ribs, making it easy to insert the coil section when storing it in the protective case. In addition, because the insulating wall is pressed against the coil bobbin side due to the effect of the convex ribs provided on the insulating wall, the insulating wall tightly fits into the notch provided in the coil bobbin, and there is no gap between the iron core and the coil. Creepage of
Spatial distance can be ensured and highly safe transformers can be supplied. Furthermore, since the convex ribs are provided, the insulating wall is less susceptible to warping, etc., and the coil part and the protective case can be easily and reliably assembled, which has great industrial effects.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an embodiment of the transformer of the present invention, FIGS. 2 and 3 are sectional views showing an embodiment of the transformer of the present invention, and FIG. 4 is a perspective view showing a conventional transformer. FIGS. 5 and 6 are cross-sectional views showing conventional examples. 21...Coil bobbin, 22...Left guard, 23...
...Right tsuba, 24...Middle tsuba, 25...Pin terminal, 26
...Output lead wire, 27...Guide groove, 28...
...Ampullary part, 29...Primary coil, 30...Secondary coil, 31...Iron core, 32...Coil part, 33...
... Insulating wall, 34 ... Protective case, 35 ... Convex rib, 36 ... Notch, 38 ... Inclined part.

Claims (1)

[Scope of utility model registration request] A coil is wound around a coil bobbin having a flange provided with notches on the coil sides of both ends at least at both ends, and an iron core is incorporated so as to surround the outer peripheral surface of the coil bobbin to constitute a coil portion that becomes a transformer body, A pair of plate-shaped insulating walls are formed with an inclined part at the upper end and have a plurality of convex ribs that abut against the inner surface of the iron core, and are inserted between the coil bobbin of the coil part and the iron core and fit into the notch of the collar. A transformer in which the above-mentioned coil part is housed in a protective case with a