JPH0244500Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a coil bobbin for a high voltage transformer that can prevent dielectric breakdown at a lead wire outlet.

[Prior art]

Conventionally, a coil bobbin used in a transformer in which crossing of the lead wires at the lead wire outlet is a problem, as shown in the perspective view of FIG. A groove 14 provided in the collar 12 for leading in and pulling out the lead wire is formed vertically. Therefore, as seen in the cross-sectional view of FIG. 4, the lead-in wire 16 at the winding start side enters the winding core obliquely from the inner corner of the groove 14, and as a result, the lead wire and the winding wire are separated. They are designed to intersect with each other in a pressed state.

[Problem that the invention attempts to solve]

In the conventional coil bobbin as mentioned above,
In order to prevent short circuits that occur at the intersections of lead wire lead-in wires, insulating tubes or tape were applied to the lead wires, but this resulted in blistering at the windings, reducing processing efficiency and reducing material and processing costs. This has the disadvantage of leading to increase in size and reducing mass productivity.

[Means for solving problems]

The coil bobbin according to the present invention includes a rectangular cylindrical winding core made of an insulating material, flanges provided at both ends of the winding core and projecting outward, and in contact with the inner surface of one of these flanges, In the coil bobbin, the coil bobbin includes a plate-shaped protrusion provided around an end of a winding core, and a plurality of grooves provided from the protrusion to the one brim for guiding a lead wire of the winding. The inner wall of the groove on the lead wire lead-in side that comes into contact with the winding at the start of winding is at least partially sloped so that it becomes wider as it gets deeper.

[Example of idea]

Next, examples of the coil bobbin according to the present invention will be described with reference to the drawings.

FIGS. 1 and 2 are perspective views and cross-sectional views, respectively, of the structure of an embodiment of the present invention, mainly showing the lead wire extraction side. In these figures, 1 is a winding core, 2 is a collar provided on one end side of the winding core 1, and 3 is a plate-shaped protrusion that is in contact with the inner surface of the collar 2 and extends around the end of the winding core 1. 4 are a plurality of grooves provided from the protrusion 3 to the collar 2 for guiding the winding lead-in wires and lead-out wires. This groove 4 is inclined so that it becomes wider as the inner wall on the drawing-in side in the winding start direction becomes deeper. Due to this inclination, as shown in FIG. 2, when applying the winding 5, the lead-in wire 6 is guided deep into the groove 4, and then enters the winding core from there, where the winding 5 is applied. be done. Therefore, the wire wound on the groove 4 side of the winding 5 and the wire pulled out when winding is completed do not intersect with the lead-in wire 6.

In the above embodiment, as shown in FIG. 1, the slopes in the plurality of grooves 4 become wider at the deeper part from the middle part of the groove provided in the protruding part 3 to the boundary with the winding core side. However, the present invention is not limited to this, and it goes without saying that the above-mentioned slope may be formed from the groove provided in the collar 2 to the groove of the protrusion 3.

[Effects of the invention] As is clear from the above explanation, according to the invention, the plurality of grooves for the lead wire provided between the collar and the protrusion of the winding core are arranged on the lead wire lead-in side relative to the winding start of the winding. By slanting the inner wall of the winding, it is possible to prevent the lead-in wire at the start of the winding from crossing the winding, eliminating the use of insulating tubes and tapes, improving processing efficiency and economy. The effects of improving sex are great.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing the structure of an embodiment of the present invention, mainly showing the lead wire extraction side, and FIG.
FIG. 1 is a cross-sectional view showing the structure of the embodiment shown in FIG. 1, mainly showing the lead wire extraction part, FIG. 3 is a perspective view showing an example of the structure of a conventional coil bobbin, mainly showing the lead wire drawing side, and FIG. FIG. 3 is a cross-sectional view mainly showing a lead wire extraction portion of a conventional structure in FIG. In the figure, 1 is a winding core, 2 is a collar, 3 is a protrusion, 4 is a groove, 5 is a winding wire, and 6 is a lead-in wire.

Claims (1)

[Scope of utility model registration request] A rectangular cylindrical winding core made of an insulating material, flanges provided at both ends of the winding core and projecting outward, and in contact with the inner surface of one of these flanges and extending around the end of the winding core. In the coil bobbin, the coil bobbin is configured of a plate-shaped protrusion and a plurality of grooves provided from the protrusion to the one brim for guiding the lead wire of the winding. A coil bobbin characterized in that an inner wall on a lead wire drawing side that comes into contact at the beginning is at least partially sloped so that it becomes wider as it gets deeper.