JPS593548Y2 - Porcelain shielding device for induction equipment - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an improvement of a magnetic shielding device for induction equipment such as a transformer or a steering wheel.

In general, in induction equipment such as transformers and reactors, leakage magnetic flux caused by load current flowing through the windings and leakage magnetic flux caused by current flowing through high-current lead wires connected to low-voltage windings are caused by leakage magnetic flux caused by the tank wall of the induction equipment such as transformers. and other conductive structures, causing stray loss in them and causing local heating.

Conventionally, as a magnetic shielding device for preventing this leakage magnetic flux from penetrating the tank wall, a magnetic shielding body in which a plurality of rectangular silicon steel plates or the like are stacked and arranged on the tank wall has often been used.

Figures 1a and 1l) show the structure of a conventional magnetic shielding device. The figure shows an example of the arrangement of the above-mentioned magnetic shielding body on a tank wall, where a is a front view and b is a side view. 1 is a tank wall of an induction device such as a transformer or a reactor, and 2 is a magnetic shield placed on the tank wall, which is constructed by laminating thin rectangular silicon steel plates.

In the conventional device configured as described above, due to the magnetic conductivity of the magnetic shield 2, leakage magnetic flux from the winding or high current lead wire (none of which is shown), which is a source of leakage magnetic flux, is transferred to the magnetic shield 2. This means that eddy current loss can be reduced because it does not pass through and enter the tank wall.

However, since the magnetic shielding body 2 is constructed by laminating strip-shaped silicon steel plates, the structure is more difficult to form a layered body, and to hold, support and fix the formed layered body, compared to that of a single structure. It is disadvantageous in that it is complicated, requires a great deal of labor and time, and is expensive.

This invention was made in view of the above-mentioned drawbacks, and the object is to obtain a magnetic shielding device for induction equipment that is easy to form and inexpensive.

FIG. 2 shows an embodiment of this invention, in which a plurality of non-magnetic plates 6 made of stainless steel or the like are connected to a tank wall 1 along the flow of leakage magnetic flux.
It is attached via the mouth shaped steel 7a.

The mouth shaped steel 7a forms a cooling medium passage 7b between it and the tank wall 1.

4 is a magnetic shield made by spraying a magnetic material such as silicon steel as fine particles from a spray gun.
It is a combination of fine particles and contains an appropriate amount of oxide, increasing the specific resistance value, and is very effective in suppressing the eddy current caused by leakage magnetic flux passing through the magnetic shield 4.

Reference numeral 5 denotes an end plate made of non-magnetic metal such as stainless steel.

With the above configuration, since the magnetic shield 4 is formed by thermal spraying, the magnetic shield 4 can be formed more easily than the conventional one formed by laminating silicon steel plates, and the magnetic shield 4 can be formed using a non-magnetic plate. 6, the required thermal spraying thickness of the magnetic shield 4 can be easily obtained.

Further, by providing the cooling medium passage 7b, the cooling effect is also improved.

As described above, this invention has effects such as improving the performance of the magnetic shield, being easy to manufacture, and improving the cooling effect.

[Brief explanation of drawings]

Figures 1a and 1) are front and side views of the conventional device, respectively.
FIG. 2 shows an embodiment of this invention, and FIG. 2a is a front view, FIG. 2 is a side view, and FIG. 2C is a sectional view taken along the line CC in FIG. 1... Tank wall, 4... Magnetic shield,
5... End plate, 6... Non-magnetic plate, 7a.
...Tank steel, 7a...Passway. In each figure, the same reference numerals indicate the same or corresponding parts.

Claims (2)

[Scope of utility model registration request] (1) A hammered steel that forms a plurality of passages for cooling medium between the tank wall of the induction equipment and the shaped steel that is attached to the tank wall in parallel along the flow of leakage magnetic flux of the induction equipment. A magnetic shielding device for an induction device, comprising: a plurality of non-magnetic plates, and a magnetic shield formed on the tank wall by spraying a magnetic material. (2) A magnetic shielding device for an induction device according to claim 1, wherein the magnetic material is silicon steel.