JPS642422Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to an improvement of a device that supports the contents of a transformer within a case.The purpose of this invention is to make the transformer smaller by simplifying the structure of the support device. The object is to be lightweight and to produce it economically.

Conventionally, when supporting the contents of a transformer within a case, for example, as shown in FIG.
Clamps 3, 3' are placed above and below the core 2 wrapped with
The L-shaped mounting arms 6 welded to the upper surface of both longitudinal ends of the clamp 3 attached to the upper part of the iron core 2 are attached to the case 5. The transformer contents 4 were supported in the case 5 by bringing the transformer body 4 into contact with a mounting seat 7 welded to the inner wall surface of the transformer 5, and then tightening the mounting arm 6 to the mounting seat 7 with a tightening bolt 8. However, in the above supporting method, the mounting seat 7 for fixing the mounting arm 6 is attached to the case 5 as shown in FIG.
It protrudes from the inner wall of the case 5 toward the center of the transformer. Therefore, assembling the transformer is very time-consuming and troublesome.In addition, since the mounting seat 7 protrudes into the case 5, the case 5 must be closed to prevent the transformer contents 4 from coming into contact with the mounting seat 7. 5, the case 5 itself must necessarily be made larger, and furthermore, the large size of the case 5 has the disadvantage of increasing the manufacturing cost of the transformer. For this reason, recently, instead of providing the mounting seat 7 on the inner wall surface of the case 5, as shown in FIG.
A method is adopted in which a cap nut 9 is inserted through the side wall of the case 5 corresponding to the mounting arm 6 from the outside, and a tightening bolt 8 is tightened to the cap nut 9 to secure the mounting arm 6 to the cap nut 9. has been done. However, in this method, a through hole 10 is bored in the case 5 and the body of the cap nut 9 is passed through the through hole 10 and the cap nut 9 is welded to the outside of the case 5. By reducing the degree to which the body protrudes into the case 5, it is possible to make the case 5 somewhat smaller than in the case described above, but on the other hand, it is possible to make the case 5 somewhat smaller than in the case described above. If the work is not done properly, there is a risk of insulating oil leaking from the through hole 10, and the cap nut 9 itself is expensive, increasing the cost of the damaged transformer. Since the heat dissipation fins 11 of the case 5 cannot be provided to cover the cap nut 9 in order to check for oil leakage, there is a risk that the cooling capacity of the transformer will be reduced.

The present invention eliminates the above-mentioned drawbacks and provides a simple structure and low cost support device for the transformer contents that can quickly and reliably support the transformer contents to the transformer case without increasing the size of the transformer case. It provides
Below, an embodiment of the present invention will be explained with reference to FIGS. 4 and 5. Reference numeral 21 denotes an iron core of a transformer;
A coil 22 is wound around both legs of the transformer, and clamps 23 and 24 are attached to the top and bottom of the iron core 21 to form a transformer body 25. Reference numeral 26 denotes a mounting arm formed by bending a metal plate such as an iron plate into an L-shape, and this mounting arm 26 corresponds to the inner wall surface of the body of the case 28 with its vertical portion a protruding outside the outer periphery of the coil 22. The upper clamp 23 is attached perpendicularly to the upper surface of both longitudinal ends thereof. 27 is a bolt hole drilled in the vertical part a of the mounting arm 26, and 28 is a case for storing the transformer contents 25. On the inner wall surface of the case 28 corresponding to the mounting arm 26, as shown in FIG. At a position on the same line as the bolt insertion hole 27 provided in the vertical part a of the mounting arm 26,
A recessed portion 29 is integrally formed with the case 28 and recessed on the outside thereof. This concave portion 29 is
When the body of the case 28 is formed from a steel plate into a circular or rectangular shape, it is formed by punching the body into a circular or rectangular shape using a press in a step prior to forming the body into a circular or rectangular shape. Reference numeral 30 denotes a tightening seat having a screw hole 31 in the center of the nut, etc., which is welded in the recessed portion 29 facing the mounting arm 26;
is attached to the recessed portion 29 in such a manner that it matches the bolt insertion hole 27 of the mounting arm 26 and protrudes slightly into the case 28 from the inner wall surface of the case 28.

In the figure, 32 is a washer, and 33 is a tightening bolt 34, which is a heat dissipation fin provided on the outside of the case 28.

Next, to explain the case where the transformer contents 25 are supported by the case 28, first, the transformer contents 25 are attached to the case by aligning the mounting arm 26 with the position of the tightening seat 30 provided in the recessed part 29 inside the case 28. Stored in 28. When the transformer contents 25 are placed in the case 28, the vertical portion a of the mounting arm 26 comes into contact with the tip of the tightening seat 30, and the bolt insertion hole 27 of the vertical portion a comes into contact with the tightening seat 3.
Since it is provided to match the screw hole 31 of 0, in this state, tighten the tightening bolt 33 with the washer 3
2 through the bolt insertion hole 27, and tighten the tightening seat 30.
When the screw holes 31 are screwed, the transformer contents 25 can be firmly supported within the case 28 via the mounting arms 26.

As mentioned above, in this invention, a concave part is integrally formed on the inner wall surface of the case in correspondence with the mounting arms provided at both ends of the upper clamp that tightens the upper part of the core of the transformer, and the tip of the case is attached to this concave part. The structure is such that the contents of the transformer are supported and fixed within the case by welding a tightening seat that protrudes slightly into the case from the inner wall surface and tightening the mounting arm to this tightening seat. It has the following effects.

In this invention, when fixing the contents of the transformer to the case, the tightening seat installed in the recessed part of the case body
Since it is provided so as to slightly protrude into the case from the recessed part, when the contents of the transformer are stored in the case, the contents of the transformer can be smoothly stored without being hindered by the tightening seat, and When the mounting arm fixed to the upper clamp inside the transformer is brought into contact with the above tightening seat, the bolt insertion hole drilled in the vertical part of the mounting arm and the screw hole of the tightening seat will match on the same line. Therefore, the mounting arm and the tightening seat can be fastened quickly and easily using the tightening bolt with a simple structure. Furthermore, the tightening seat slightly protrudes into the case from the inner wall surface of the case, and the mounting arm is provided so that its vertical portion is located outside the outer periphery of the coil, so the mounting arm is positioned inside the case. easily contact the tightening seat at the
Since it can be fastened quickly and reliably, the work of supporting and fixing the contents of the transformer inside the case can be carried out smoothly and efficiently without requiring much effort.

In addition, the recessed portion of the case body to which the tightening seat is fixed has a small diameter that is small enough to accommodate the tightening seat, and is relatively shallow so that it bulges out integrally with the case during molding of the case. This can cause problems with the installation of heat dissipation fins,
In addition, there is no need to worry about leakage of insulating oil, and since it is formed with a slight bulge on the outer peripheral surface of the case, the cooling effect and aesthetics of the transformer will not be impaired. Therefore, the case can be made smaller compared to the conventional method of fixing the contents of the transformer by providing a mounting seat inside the case or by protruding a cap nut into the case from the outside of the case. Since leakage of insulating oil can be reliably avoided, the transformer can be manufactured economically and easily without taking any special measures against oil leakage.

Furthermore, in the present invention, the mounting arm fixed to the upper clamp in correspondence with the tightening seat is provided with its vertical portion serving as a free end and protruding outward from the outer periphery of the coil. For example, even if the internal diameter of the case itself varies within the allowable range, the vertical part of the mounting arm is a free end, so it can be easily brought into contact with the end surface of the tightening seat. This allows the contents of the transformer to be supported and fixed quickly and reliably without any problems. Furthermore, when supporting the transformer, the contents of the transformer are completely housed in the case and supported, so the weight of the contents of the transformer is used effectively for support, so the support points are as follows:
It is only necessary to support and fix the contents of the transformer in two places at the top, and the upper space inside the case can be effectively used for supporting the contents. By reducing the number of parts, etc., it can be performed quickly, easily, and reliably, and the productivity of the transformer can be significantly improved.

[Brief explanation of the drawing]

Figures 1 and 2 are longitudinal cross-sectional views of a transformer showing a conventional transformer internal support device, and Figure 3 is A of Figure 2.
FIG. 4 is a vertical cross-sectional view of a transformer equipped with the transformer internal support device of the present invention;
FIG. 5 is an enlarged vertical cross-sectional view of portion B in FIG. 4. 25...Transformer contents, 26...Mounting arm, 28...
... Case, 29 ... Recessed part, 30 ... Tightening seat, 3
3...Tightening bolt.

Claims (1)

[Scope of utility model registration request] On the upper surface of the end in the length direction of the upper clamp 23 fixed to the upper part of the iron core 21 constituting the transformer contents 25, a vertical part a, which is the free end side, is projected upward in correspondence with the body of the case 28. L-shaped mounting arm 26
are fixed facing each other with the vertical portion a protruding outward from the outer periphery of the coil 22, and a bolt insertion hole 27 is bored in the vertical portion a of the mounting arm 26, and the bolt is inserted through the vertical portion a of the mounting arm 26. A small-diameter recess 29 is formed in the body of the case 28 corresponding to the hole 27, extending outward from the inner wall surface at a position on the same line as the bolt insertion hole 27. A tightening seat 30 having a screw hole 31 in the center is arranged so that the bolt insertion hole 27 and the screw hole 31 are aligned, and the end surface of the tightening seat 30 slightly protrudes from the recessed part 29 into the case 28. The vertical part a of the mounting arm 26 is attached to the concave part 29 of the case 28.
The transformer contents 25 are fixedly supported on the tightening seat 30 by tightening the mounting arm 26 and the tightening seat 30 with a tightening bolt 33. A transformer internal support device characterized by: