JPS5843216Y2 - stationary induction appliance - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a static induction electric appliance such as a transformer in which the mounting structure of a magnetic barrier board is improved.

2. Description of the Related Art A magnetic barrier board for a conventional stationary induction electric appliance such as a transformer or a reactor is installed as shown in FIGS. 1 and 2.

That is, on a portion of the inner wall surface of the tank 3 that accommodates the main body consisting of the iron core 1 and the winding 2, facing the winding 2, there is provided a holding plate with one end protruding toward the winding 2 and the other end fixed to the tank 3 by welding. 4 are arranged in a plurality of rows in the vertical direction.

A rectangular magnetic drawing board 5 is arranged between the rows of the holding plates 4 so that the longitudinal direction thereof is perpendicular, and the free end side of each holding plate 4 is bent to attach it.

In this case, the magnetic drawing board 5 is a stack of a plurality of magnetic plates such as electric iron plates.

However, in the above structure, as shown in Fig. 2 a and b,
The mutual dimension of the magnetic drawing plates 5 is the welding width X dimension of the presser plate 4 and the plate thickness T dimension of the presser plate 4, so that a gap of G=(2XT)1X is created.

As this gap becomes larger, the electric field stress between the winding 2 and the magnetic shield 5 increases, resulting in a decrease in magnetic shielding characteristics.
Therefore, the insulation distance between the winding 2 and the tank 3 must be increased.

Therefore, the present invention has been devised to eliminate the above-mentioned drawbacks, and its purpose is to minimize the dimensions between the magnetic shields and drawing boards, and to minimize the insulation distance between the windings and the magnetic boards. It is an object of the present invention to provide a stationary induction electric device which can reduce the amount of noise, has a high magnetic shielding effect, and does not cause disturbances in the electric field.

An embodiment of the present invention will be described below with reference to the drawings.

In Fig. 3 and Fig. 4 a, l), the iron core 1 and the winding 2
The main body consisting of is housed in a tank 3, and at least a pair of holding plates 11 for fixing the magnetic barrier plate 12 are arranged in a plurality of rows in the vertical direction on the inner wall surface of the tank 3 at a portion facing the windings. , one end of each is made to protrude inward and the other end is welded and fixed on one side.

In this case, all the holding plates 11 are welded on one side on the same side.

A magnetic diaphragm plate 12 made of laminated magnetic plates is arranged between the pair of presser plates 11, and the free end side of each presser plate 11 is bent to fix the magnetic diaphragm plate 12 to the inner surface of the tank.

The magnetic drawing board 12 is constructed by making the width of the required number of magnetic plates 12a on the tank 3 side narrower than the width of the other magnetic plates 12b, and also has a groove portion for accommodating the welded portion of the holding plate 11. A stepped portion 12C is formed by stacking the magnetic plates with the other side aligned at the same position, and this stepped portion 12C is the welded portion of the holding plate 11. are arranged to face each other.

Therefore, the magnetic baffle plate 22 can absorb the protruding size of the welded portion by the step portion 12C, so that the magnetic baffle plate 12 can be arranged so that both sides thereof are in contact with the presser plate 11.

For this reason, the dimension g between each magnetic baffle plate 12, 12 does not require the welding width dimension as in the conventional case, and becomes almost equal to the plate thickness dimension T of the holding plate 11, which is smaller than the conventional one.
The electric field stress between the magnetic shield and the drawing board 5 can be reduced.

In this case, the presser plate 11, as shown in FIGS. 4a and 4b,
If the length of the end on the side to be bent is shorter than the length of the end on the side to be welded to form the claw portion 11a, the welded portion will be longer and the quality will be stable. It becomes easy to bend and form a.

In addition, the dimensions between each magnetic drawing board 12, 12 are
As shown in FIGS. 5a and 5b, two claws 21a and 21
By providing the two claws 21a and 21b, the adjacent magnetic plates 12 and 12 can be fixed, respectively.

In addition, as shown in FIG.
3, and by folding its end toward the tank 3 side to cover the magnetic baffle plate 12, the electrical stress can be further reduced.

As described above, according to the present invention, the holding plate to which the magnetic drawing board is attached is welded to the inner surface of the tank on the same side, and
Among the magnetic plates, a predetermined number of magnetic plates located on the tank side are made narrower in width than the other magnetic plates, and one side is attached to the other so as to form a groove for accommodating the welded part of the holding plate. Since the sides of the magnetic board are tucked in and aligned in the same position, the dimensions between the magnetic boards and the drawing board can be minimized, and the insulation distance between the windings and the magnetic board can be reduced. It is possible to obtain a stationary induction electric device that has excellent magnetic shielding effects, is easy to assemble, is accurate, and does not cause disturbances in the electric field.

[Brief explanation of the drawing]

Fig. 1 is a plan view showing a magnetic barrier board mounting structure in a conventional stationary induction electric appliance, Fig. 2 a and b are a plan view and a front view showing details of section A in Fig. 1, and Fig. 3 is a main A plan view of a stationary induction electric appliance showing one embodiment of the invention, FIGS. 4a and b are a plan view and a front view showing the main parts of FIG. 3, and FIGS. 5a and b are other embodiments of the invention. FIG. 6 is a plan view showing another embodiment of the present invention. 1... Iron core, 2... Coil, 3...
...Tank, 4...Press plate, 11.21...
... Pressing plate, 11 a, 21 a, 21 b.
...Claw part, 12...Magnetic drawing board.

Claims (1)

[Scope of utility model registration request] A main body consisting of an iron core and a winding is housed in a tank, and at least a pair of holding plates, one end of which is welded to the tank, is provided on a portion of the inner wall surface of the tank opposite to the winding, and the pair of holding plates The other end of the holding plate is bent and the magnetic plate cut out from the laminated magnetic plate is pressed from both sides to be attached to the inner surface of the tank, and the holding plate is welded to one side on the same side, and The width of a predetermined number of magnetic plates located on the tank side is made narrower than the width of the other magnetic plates, and one side of the magnetic plates is made narrower than the other magnetic plates so as to form a groove for accommodating the welded part of the holding plate. A stationary induction electric appliance characterized by being installed with the other side aligned in the same position as the other side.