JPH03190207A - Winding securing device - Google Patents

Abstract

PURPOSE:To easily mount a wedge by providing a core clamping band secured at a predetermined pitch at a plurality of longitudinal positions of a core leg, and the wedge having a spiral groove to be engaged with the band between the band and the leg. CONSTITUTION:A core leg 1a is clamped fixedly with a core leg clamping band 2, and a wedge 14 has a spiral guide groove 14a having a sectional size to be engaged with that of the band 2. Accordingly, when the groove 14a is made to abut on the band 2 and slid with the band 2 as a guide from a direction of an arrow A while rotating the wedge 14, the wedge 14 is advanced in the direction of the arrow A, and can be inserted until it coincides with the lower end of a winding 3. Thus, the wedge for burying a gap between the leg 1a and the winding 3 can easily be mounted.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a winding fixing device that fixes between the core and winding of electrical equipment such as a transformer.

(Prior Art) Iron cores of electrical equipment such as transformers have a structure in which the outer periphery is tightened with appropriate pressure for the purpose of improving mechanical strength, electromagnetic characteristics, and reducing noise. , tightened using glass tape or partially insulated steel bands. On the other hand, the winding wire is often wound onto a coil bobbin and combined with an iron core, but at this time a gap is created between the coil bobbin and the iron core. In the event of a short circuit, the amount of this gap is appropriately set in consideration of the buckling stress on the inside of the winding caused by the electromagnetic force generated in the winding, and the structure is such that the mechanical force due to the buckling is supported on the iron core side. There is. That is, as shown in FIG. 6, in order to improve workability, the mechanical force is borne by the coil bobbin itself, and some gap is left.

Further, in the invention disclosed in Japanese Patent Application Laid-Open No. 60-74409, as shown in FIGS. 9 to 12, when wrapping the core tightening band 2 around the core leg 1a, a mount 6 having a spacing piece 5 is attached. Then, a wedge 4 is driven between the mount 6 and the iron core la to fix it. Further, in a relatively small capacity electric device, after winding the winding 3 around the iron core 1, a wedge 4 may be driven into the gap between the iron core 1 and the winding 3 to fix the winding 3.

(Problem to be Solved by the Invention) In the above-mentioned conventional technology, in the case of a coil bobbin 7 having a gap, it is necessary to increase the wall thickness of the coil bobbin 7 to maintain strength against buckling stress. The problems were the decline in the number of coils and the high cost of the coil bobbin 7. In addition, iron core leg 1
When tightening the core tightening band 2, the work becomes complicated because a large number of mounts 6 having the spacing pieces 5 are rolled up, and the mounts 6 are made of insulating paper such as press ports.
It was not easy to adjust the tightening force to a constant value.

Further, if the wedges 4 are directly driven in, there is a risk that the core tightening band 2 may be cut, so there is a problem that the core leg 1a may not be fully fixed.

In view of the above problems, the present invention provides an iron core tightening band 2.
After tightening and fixing only the core leg 1a and winding three windings, the core leg 1a is tightened without cutting the core attachment band 2.
It is an object of the present invention to provide a winding fixing device to which a wedge 4 can be easily attached in order to fill the gap between the winding 3 and the winding 3.

(Means for Solving the Problem) The above object is to provide a core clamping band that is fixed at a plurality of locations in the longitudinal direction of the core leg at a predetermined pitch, and a core clamping band that is fitted between the clamping band and the core leg. This is achieved by means of a winding securing device having a wedge with mating helical grooves.

(Operation) With the above configuration, when the wedge is inserted from above, the tightening band and the spiral groove are brought into contact, and the wedge is rotated,
The spiral groove slides using the tightening band as a guide, and the wedge can be gradually lowered and inserted to the lower end of the winding.

(Example) An embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a cross-sectional view of essential parts showing an embodiment of a winding fixing device according to the present invention, and FIG. 2 is a longitudinal cross-sectional view of the same, showing a core leg 1.
The wedge 14 is shown inserted between the coil bobbin 7 and the coil bobbin 7. The core leg 1a is tightened and fixed by a core tightening band 2.

As shown in FIG. 3, the wedge 14 is provided with a spiral guide groove 14a having a cross-sectional size that can be fitted to the cross-sectional size of the core tightening band 2. The optimum outer diameter of the wedge 14 is selected from several pre-prepared sizes depending on the size of the gap between the core leg 1a and the coil bobbin 7.

In the above configuration, the guide groove 14a of the wedge 14 is brought into contact with the core tightening band 2, and the spiral groove 14a is slid with the core tightening band 2 as a guide while rotating the wedge 14 from the direction indicated by the arrow shown in FIG. and wedge 14
can be inserted in the direction of arrow A until it coincides with the lower end of winding 3 of the coil.

According to this embodiment, after the core leg 1a is tightened using the core tightening band 2 and the core 1 and the winding 3 are tied together, the wedge 14 can be inserted without applying an undue external force. , to prevent buckling stress from occurring inside the winding.
The gap between the core leg 1a and the winding 3 can be filled and fixed. Therefore, there is no risk of cutting the core tightening band 2.

(Effects of the Invention) According to the present invention, when assembling electrical equipment such as a transformer, it becomes possible to extremely easily attach a wedge to fill the gap between the core leg and the winding, and to attach the wedge to the inside of the winding. It was possible to provide a highly reliable winding fixing device that completely fixes the core and the windings without producing buckling stress.

[BRIEF DESCRIPTION OF THE DRAWINGS] FIG. 1 is a cross-sectional view of the main part showing an embodiment of the winding fixing device according to the present invention, FIG. 2 is a longitudinal cross-sectional view of the same, and FIG. 4 is a diagram showing the configuration of the core of the present invention, FIG. 5 is a cross-sectional view showing the assembly of the core and windings according to the present invention, and FIGS. 6 and 7 are respectively diagrams of the prior art. FIG. 8 is an external perspective view of a wedge according to the prior art; FIGS. 9 and 10 are a cross-sectional view and a longitudinal sectional view of a main part of another prior art, and FIG. The figure is a perspective view of a mount according to the prior art, and FIG. 12 is a perspective view of a wedge according to the prior art. 1... Iron core

Claims (1)

[Claims] 1. In a winding fixing device for fixing a coil winding to a core leg configured to have a circular cross section by stacking steel plates of multiple widths in a stepwise manner, a predetermined number of predetermined points are attached to a plurality of locations in the longitudinal direction of the core leg. Iron core tightening band fixed at pitch,
A winding fixing device comprising a wedge provided between the winding of the coil and the core leg and having a helical groove that fits into the tightening band.