JPS6236623B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates to electromagnetic induction devices such as high impedance transformers, shunt reactors, high capacity transformers, and the like.

In this type of equipment, since there is a large amount of leakage magnetic flux from the coil, an auxiliary iron core for leakage magnetic flux is required in addition to the main iron core for the main magnetic flux. The auxiliary core is installed integrally with the main core. Conventionally, the auxiliary core was integrally tightened and fixed to the main core, but a band was wrapped around both cores and the entire core was tightened or fixed. A stud was passed through both iron cores and then tightened and fixed. However, in the former case, it is extremely difficult to firmly tighten both cores at once, and problems such as increased noise or deterioration of core characteristics due to magnetostrictive vibration of the core, vibration during transportation, etc. may occur. In the latter case, a stud long enough to penetrate both cores is required, and the longer the stud, the lower the mechanical strength, so the core's own weight,
It becomes difficult to withstand large external forces such as magnetostrictive vibrations. Therefore, the same problem as in the former case may occur. In order to increase the mechanical strength of the stud, it would be possible to use a stud with a larger diameter, but this would require the through hole in the core to be larger, which would reduce the core cross-sectional area, which would affect the core properties. begins to decline.

This invention does not significantly impair the core properties,
The purpose is to firmly tighten and fix the main core and auxiliary core.

Embodiments of the invention will be described with reference to the drawings. 1 is the main core, 2 is the auxiliary core, 3 is the center leg 4 of the main core 1
It is a coil that is wound around. The main core 1 is configured in an open magnetic path shape, with clamping fittings 5 applied to both sides thereof, and studs 6 passing through the main core 1 and the clamping fittings 5, and nuts 7 screwed onto both ends thereof. tighten. The auxiliary core 2 is configured in a closed magnetic path so as to surround both the upper and lower end surfaces and the left and right sides of the coil 3, and is fastened and fixed to the main core 1 so as to come into contact with each surface of the main core 1. For this purpose, in one embodiment of the present invention, the boss 8 is fixed to the fastening fitting 5 by welding or the like, as shown in the enlarged view of FIG. Insert it into the auxiliary core 2, screw the tightening nut 10 onto the other end, and connect the main core 1.
Tighten by pressing to the side. Note that 11 is a tightening fitting for the auxiliary core 2, 12 is a hole formed in the auxiliary core 2, 13 is a locking nut to be screwed into the stud 9, and 14 is an insulating collar placed in the hole 12 if necessary. .

With this configuration, the auxiliary core 2 is connected to the main core 1.
When tightening and fixing the main core 1, a different stud 9 is used for tightening the main core 1, so unlike the conventional method where both the main and auxiliary cores are tightened with a common stud 9, it is not necessary to use long studs. It is not necessary to use studs, therefore, they can be tightened firmly enough to withstand mechanical vibrations and other external forces, and studs with a large diameter are sufficient because they only need to be long enough to pass through the auxiliary core 2. Since it is no longer necessary to use a hole 12, the diameter of the hole 12 can be made correspondingly small, so that the core characteristics are not significantly impaired. Of course, the tightening force is stronger and the tightening is much more stable than the conventional tightening with a band.

The embodiment shown in FIG. 3 uses a bolt 15 instead of the stud 9, and the head 16 of the bolt 15 is
is similarly fixed to the clamping fitting 5 by welding or the like, and its threaded rod 17 is inserted into the auxiliary iron core 2, and a tightening nut 18 is tightened at its tip. In another embodiment shown in FIG. 4, the nut 19 is fixed to the fastening fitting 5, contrary to the embodiment shown in FIG.
, and screw it onto nut 19 and tighten.
These configurations also enable tightening and fixing that is no different from that shown in FIG. 22 is the head of the bolt 20.

As can be understood from each of these embodiments, the key point is to insert screw shafts such as the stud 9 and screw rods 17 and 21 into the auxiliary core 2, and fix or screw them onto the fastening fitting 5 of the main core 1. The auxiliary core 2 may be pressed and tightened toward the main core 1 using this screw shaft.

As described in detail above, according to the present invention, the auxiliary core can be securely tightened and integrally fixed with the main core, and the core characteristics are not significantly impaired.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing an embodiment of the invention, Fig. 2 is a perspective view showing an embodiment of the invention;
The figure is an enlarged sectional view of the main part, and FIGS. 3 and 4 are enlarged sectional views of the main part showing other embodiments of the present invention. 1... Main core, 2... Auxiliary core, 3... Coil, 5... Tightening fitting, 8... Boss, 9... Stud, 10... Tightening nut, 15, 20... Bolt, 17, 20...Rabo, 18, 19...Natsuto.

Claims (1)

[Claims] 1. In an electromagnetic induction device consisting of a main core having legs around which a coil is wound, and an auxiliary core for leakage magnetic flux of the coil, a screw shaft is inserted into the auxiliary core, and a screw shaft is inserted into the auxiliary core, and the screw shaft is inserted into the tightening metal side of the main core. An electromagnetic induction device in which one end of the screw shaft is fixed or screwed together, and the auxiliary core is pressed against the main core by the screw shaft and integrally tightened and fixed.