JP2573290B2 - Stacking transformer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial application field) The present invention relates to a stacked transformer in which a plurality of transformer bodies are stacked.

(Prior Art) In recent transformers for building power distribution, the entire equipment is made as small as possible in order to effectively utilize floor space and facilitate loading. On the other hand, power consumption in buildings is increasing due to air conditioning, lighting, automation of various facilities, installation of various office machines, etc. In addition, there is a trend to increase the voltage of this type of transformer in order to improve the economics of wiring. . For this reason, transformers for power distribution in buildings are required to reduce the floor space while promoting medium- and high-voltage capacity.
Usually, a configuration is adopted in which a plurality of transformer bodies are used, and these are stacked.

In this case, a structure is generally used in which hardware is attached to a plurality of transformer bodies, and these are stacked and connected with bolts and nuts.

(Problems to be solved by the invention) However, in such a structure, when a horizontal force such as an earthquake is applied, measures are taken to increase the strength by increasing the strength by weakening the connection between the upper and lower transformer main bodies and increasing the strength. Must be added to the weight.

SUMMARY OF THE INVENTION An object of the present invention is to provide a stacked transformer in which a plurality of transformer bodies are stacked, the seismic strength can be improved without increasing the weight.

[Constitution of the Invention] (Means for Solving the Problems) The present invention provides, for example, a U-shaped lower metal fitting which is fitted to a lower yoke of an iron core of a lower transformer main body, and has both ends of the lower metal fitting. For example, a side metal fitting formed in a U shape, for example, which is rigidly joined and engages with both leg portions of the iron core is provided. Also,
An upper metal member, for example, formed in a U-shape, which is connected to the metal members on both side surfaces and engages with the upper yoke of the iron core, is provided. Then, for example, an L-shaped fixing hardware having a flat plate-shaped portion for fixing the upper transformer main body, which is connected to, for example, a U-shaped connecting hardware engaging with the side surface hardware of the lower transformer main body, is provided between the connecting hardware. The upper transformer main body is fixed on the fixing hardware.

(Operation) With the above structure, the connecting portion between the connecting hardware and the side surface hardware of the lower transformer main body receives a horizontal force on its surface. Therefore, if the size of the contact surface is determined in accordance with the force acting on the connecting portion and the thickness of the connecting hardware is also determined in accordance with the acting force, a connecting portion having the required seismic strength can be obtained.

(Example) An example of the present invention will be described below. 1 (a) and 1 (b) are a front view and a side view showing a stacked transformer according to an embodiment of the present invention, and FIG. 2 is an exploded perspective view showing a support frame. Reference numeral 1 denotes a lower transformer main body, which is formed by winding a dry winding 1b such as a molded winding around each central leg of a three-phase five-leg wound core 1a. A lower metal part 3 having a U-shaped cross section is provided at a lower yoke part of the wound core 1a of the lower transformer main body 1 so as to fit into the lower yoke part. A fixing seat 4 having a fixing hole 4a is provided at both longitudinal ends of the lower metal member 3. At both ends of the lower metal member 3, side metal members 5, 5 each having a U-shaped cross section are provided so as to fit to both side legs of the wound iron core 1a. These side metal parts 5, 5 are rigidly joined to the lower metal part 3 to constitute a U-shaped support frame as a whole, and the lower transformer main body 1 is disposed in the support frame. A box-shaped upper metal fitting 6 is fitted to an upper yoke portion of the lower transformer main body 1, and the upper metal fitting 6 is provided with holes (not shown) provided at both ends in the longitudinal direction and side metal fittings 5,5. Are connected to the side metal parts 5, 5 with bolts, nuts 7 and the like using the holes 5a provided in the holes.

On the other hand, reference numerals 8 and 8 denote connecting hardware, each of which is formed in a U shape, is loosely fitted to the side metal parts 5, 5 and is commonly connected to the side metal parts 5 and the upper metal body 6 by bolts 7. At the upper end of the connecting hardware 8,8, a pair of fixing hardware 10,10 is provided with both connecting hardware 8,10.
8 between them, these are holes 8 provided in each
Using a and 10b, the bolts 9 are connected via holes 5b provided in the side metal parts 5,5. The fixing hardware 10 is formed in an L shape to form a flat portion for fixing the upper transformer main body 12, and a plurality of fixing holes 10a are provided in the flat portion. I have. Upper transformer body 12
Is formed by winding a dry winding 12b around a central leg of a single-phase three-leg wound core 12a. It is arranged. An upper frame 13 having a U-shaped cross section is fitted to the upper yoke portion, and the lower transformer 11 and the upper frame 13 are connected to support the upper transformer main body 12. The upper transformer main body 12 is provided with a fixing seat 11b having a fixing hole 11a at a lower corner of the lower frame 11, and is fixed to the fixing hardware 10 by a bolt and a nut 15 through the fixing seat 11b. Have been.

By adopting such a stacked structure, the weight of the upper transformer main body 12 acts vertically on the side metal parts 5, 5 which are in contact with the fixed metal body 10, so that the metal body having increased strength can be used. The upper transformer main body 12 can be supported without using it.
The connecting hardware 8, 8 is formed in a U-shape, and the three surfaces are provided in a state of surface contact with the corresponding three surfaces of the side surface hardware 5, so that the upper transformer main body 12 in the horizontal direction due to an earthquake or the like. When a force is applied, the bending moment acting on the connecting portions of the upper and lower transformer main bodies 1 and 12 is not borne by the bolts 7 and 9 alone, but is also borne by the connecting hardware 8. Moreover, the degree of the burden can be increased or decreased by changing the length of the dimension a. For this reason, it is possible to provide a connection structure that can withstand the required seismic strength without increasing the weight such as increasing the strength of bolts and hardware.

The connecting hardware 8 is connected to the side metal fittings 5 of the lower transformer main body 1.
If you shift the position of the holes such as the bolts 9 to be fixed to the hole or make a plurality of holes so that the fixing position can be selected,
It is also possible to adjust the height of the upper transformer main body 12 according to the installation conditions.

In the above description, the lower transformer main body 1 is constituted by a three-phase transformer, and the upper transformer main body 12 is constituted by a single-phase transformer. Similar effects can be obtained.

Further, the shape of the connecting hardware 8 is not limited to the U shape, and two L shapes may be used in combination.
Any shape may be used as long as it can make surface contact.

Further, the fixed metal part 10 has the metal parts 16 having a U-shaped cross section as shown in FIGS. 3 and 4 or the flat plate-shaped parts of the pair of L-shaped metal parts 10 facing inward each other according to the upper transformer main body 12. The same effect can be obtained even if the mounting is performed.

[Effect of the Invention] As described above, according to the stacked transformer structure of the present invention, the seismic strength can be improved, and the height of the upper transformer main body can be easily adjusted.

[Brief description of the drawings]

1 (a) and 1 (b) are a front view and a side view showing an assembled state of a stacked transformer according to the present invention. FIG. 2 is an exploded perspective view of the support frame used in FIG. FIGS. 3 and 4 are partial perspective views showing other embodiments of the present invention. 1… Lower transformer main body, 1a… Winding core, 1b… Winding, 3… Lower metal, 5… Side metal, 6… Upper metal, 8… Connection metal, 10… Fixed metal , 11… Lower frame, 12… Lower transformer body, 13… Upper frame.

Claims (1)

(57) [Claims] 1. A lower transformer main body having a winding wound around an iron core;
A lower metal fitting that engages with the lower core yoke portion of the lower transformer main body, and a pair of side metal fittings that are rigidly joined to both ends of the lower metal fitting and engage with the iron core leg of the lower transformer main body, An upper metal member connected to the pair of side surface metal members and engaging with the upper core yoke portion of the lower transformer main body; a fixed metal member abutting on the upper metal member and having a flat plate portion; and both ends of the fixed metal member And a connecting metal body connected to the side metal part in surface contact with the side metal part, and an upper transformer main body fixed to the flat plate-shaped part of the fixed metal part.