JPH0532985Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a winding end insulating fixture for small transformers used in household electrical appliances, etc. in addition to microwave ovens.

BACKGROUND ART Conventionally, the coil of this type of small transformer has been manufactured by winding electric wire such as enameled wire along a winding frame using a winding machine. The ends of the windings are then terminal-treated as shown in FIG.

Here, a conventional method of terminal treatment of windings in a small transformer will be explained.

That is, as shown in the figure, the starting end a of the coil 10
is sequentially wound from one end to the other end of the inner edge (not shown) and from one layer to multiple layers, and the terminal end b of the coil is drawn out from the outer surface of the winding of the coil 10 in the same direction as the starting end a, apart from the end.

The starting end a is insulated from the upper end surface of the coil 10 by the first insulating paper 11 from above the coil 10, and is pulled out from the outlet 13 that opens into the second insulating paper 12 stacked on the first insulating paper 11. A terminal 14 such as a crimp terminal is connected to the end by caulking. Further, the terminal end b is connected to the first insulating paper 1 from the outer surface of the coil 10.
It is pulled out through a pull-out groove 15 opening in the first insulating paper 1 and a pull-out opening 16 opening in the second insulating paper 12, and a terminal 14 such as a crimp terminal is connected to the end thereof by caulking.

The first insulating paper 11 and the second insulating paper 12 are both of the same quality, and are made of insulating paper, such as amirad paper, which is bent into an L shape.

After the treatment, insulating tape 1 is placed between the outlet ports 13 and 13 perpendicularly to the winding direction of the coil 10.
7 and both insulating papers 11 and 12 into the coil 10.
It is fixed to

Problems to be Solved by the Invention However, although the drawn-out end of the coil bends the wound wire and brings it to the position of the drawn-out opening, the insulating papers 11 and 12 simply maintain insulation. Yes, the drawer end is not mechanically fixed. Therefore, when connecting the terminals 14, 14 with the socket of the other device, if the diameter of the winding is small (approximately 1 mm or less), the mechanical strength of the winding end is not sufficient, so the winding end may be bent. Another drawback was that the angle of inclination of the end of the winding could not be maintained constant after connection.

This idea was devised in view of the above circumstances.
It is an object of the present invention to provide an insulating fixture that can sufficiently maintain the strength of the end portion of the winding even when the wire has a small diameter.

Means for Solving the Problems The winding end insulating fixture for a small transformer according to the present invention includes a keeper made of synthetic resin into which the winding end is inserted while attached to the outer surface of the coil;
The keeper is provided with a cover made of synthetic resin that fits into the keeper and fixes the end of the winding. A substantially overhang-shaped fixing protrusion is protruded from both ends, and a vertical groove into which the winding end is inserted is formed in the inclined surface of the fixing protrusion, and the cover has a fixing protrusion that protrudes from the fixing protrusion. A pair of fixing recesses to be fitted together and a notch through which the winding passes when the fixing protrusion is fitted into the fixing recess are provided, and when the cover is fitted to the keeper, it is inserted into the vertical groove. The end of the winding is fixed.

Function: Connect a terminal such as a crimp terminal to the end of the winding, then insert the end of the winding into the vertical groove of the fixing convex part of the keeper, and fit the cover onto the keeper. At this time, the winding end is fixed in the longitudinal groove of the fixing convex part through the notch in the cover. Thereafter, the keeper and cover are fixed to the coil side using insulating tape.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is an external perspective view showing a winding end insulating fixture for a small transformer according to the present invention, and FIG. 2 is a partial plan view of FIG. 1. Note that parts that are the same as those in the conventional technology are indicated by the same symbols.

In the figure, 10 is a coil wound in the same manner as in the conventional case.

Reference numeral 20 denotes an insulating fixture, and this insulating fixture 20 is composed of a keeper 30 and a cover 40.

The keeper 30 includes an L-shaped portion 31 made of synthetic resin and having an L-shaped cross section when viewed from the side, and two fixed convex portions 32 integrally formed on the outer vertical surface of both longitudinal ends of the L-shaped portion 31. , 32. The L-shaped portion 31 has an opening 33 at the center of its upper edge that opens upward. The fixed convex portion 32 has a trapezoidal cross section in side view, that is, a substantially overhanging shape, and the upper base is larger than the lower base. A vertical groove 34 into which the end of the winding can be inserted is formed on the slope. The width of the opening 33 is slightly larger than the width of the insulating tape 17 for fixing the keeper 30 to the coil 10.

The cover 40 is made of synthetic resin, and includes an L-shaped portion 41 having an L-shaped cross section when viewed from the side, a fixing recess 42 formed on a vertical surface of the L-shaped portion 41, and a winding end inserted through the horizontal surface. It has a notch 43 that allows the

The fixing recess 42 is formed on the inner vertical surface near both ends of the L-shaped portion 41 in the longitudinal direction.
It is formed in a shape and size to fit with the fixed convex portion 32 of No. 0. When the cover 40 is aligned with the keeper 30 in the direction of the arrow, the fixed protrusion 32 is fitted into the fixed protrusion 42.

Next, the procedure for fixing the ends of the windings using the insulating fixture 20 of the present invention will be explained.

The winding end of the coil 10 is guided from the upper surface or side surface of the coil 10 to the upper surface of the coil 10, and is drawn out of the coil 10 substantially parallel to the upper surface. After the crimp terminal 14 is caulked to the end of the winding, the end of the winding is inserted into the vertical groove 34 of the keeper 30 from outside the fixing convex portion 32.

Next, the cover 40 is aligned in the direction of the arrow shown in the figure, the end of the winding is inserted into the notch 43 of the cover 40, and the fixing protrusion 32 of the keeper 30 and the fixing recess 42 of the cover 40 are fitted. As a result, the end of the winding inserted into the vertical groove 34 can be attached to the fixed protrusion 3.
2 and the fixing recess 42. Then, the insulating tape 17 is wrapped around the keeper 30, the cover 40, and the coil 10 integrally through the opening 33 of the keeper 30 in a direction perpendicular to the winding direction of the coil 10. The insulating fixture 20 is fixed to the coil 10 by the above procedure. Note that the synthetic resin material is
Although the description has been made assuming that resins such as PBT and rhinite are used, the present invention is not limited thereto, and other types of synthetic resins may be used.

Effect of the invention The present invention inserts the winding end into the vertical groove of the fixing convex part of the keeper, and fixes the winding end by fitting the fixing convex part and the fixing recess of the cover. Since the cover is fixed by wrapping it around the coil with insulating tape, the ends of the winding can maintain mechanical strength and are firmly fixed. Further, it is possible to eliminate the drawback that the winding end is bent or deformed when the crimp terminal at the winding end is inserted into a connector of an external device.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway perspective view showing the winding end insulating fixture of a small transformer according to the present invention, Fig. 2 is a perspective view showing the terminal treatment of the winding end in the conventional technology, and Fig. 3 is FIG. 2 is a plan view showing a part of FIG. 1; 10... Coil, 14... Terminal, 17... Insulating tape, 20... Insulating fixture, 30... Keeper,
32...Fixing convex portion, 33...Opening, 34...Vertical groove, 40...Cover, 42...Fixing recess, 43...
...Notch.

Claims (1)

[Scope of utility model registration request] A keeper made of synthetic resin into which the end of the winding is inserted while being attached to the outer surface of the coil, and a cover made of synthetic resin that fits into the keeper and fixes the end of the winding. The keeper has a substantially L-shaped cross section in side view, and has substantially overhang-shaped fixing protrusions protruding from both longitudinal ends of its outer vertical surface, and the keeper has a substantially overhanging fixing protrusion on the inclined surface of the fixing protrusion. The cover has a vertical groove into which the end of the winding is inserted, and the cover has a pair of fixing recesses into which the fixing protrusions are fitted, and the cover is wound with the fixing protrusions fitted into the fixing recesses. A winding end insulating fixture for a small transformer, characterized in that the winding end insulating fixture for a small transformer is provided with a notch through which the wire passes, and when the cover is fitted to the keeper, the winding end inserted into the vertical groove is fixed. .