JPS5826500Y2 - liquid cooled wound core - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a liquid-cooled wound core that enhances the cooling effect of the wound core.

Wound iron cores are widely used in electromagnetic induction equipment, but when used particularly in high magnetic fields, they generate heat due to iron loss, causing various problems.

For example, the amount of heat generated by a saturable reactor (hereinafter referred to as a reactor), which is a typical device whose wound core is used in a high magnetic field, increases with weight. 200-300 per hit
The weight is about 1 kg, and the amount of heat generated reaches 2 to 3 kW.

On the other hand, the reactor has a wind-cooled wound core structure as shown in FIG. 1, and the only way to cool it is from the outside, so the cooling efficiency was very low.

That is, in this structure, the iron core 1 is wound along the through window 2.

The amount of heat generated in the reactor is dissipated by the cooling air coming into contact with the surface of the accelerator, as shown by arrow W in FIG.

This has the following drawbacks:

(1) The cooling effect is extremely low because the heat is radiated by wind from the surface of the accelerator.

(2) If a support frame or the like is attached to the reactor, the heat radiation area becomes smaller and the cooling effect becomes worse.

(3) It is necessary to support the reactor and use materials with high heat resistance, which increases costs.

(4) It is necessary to make the reactor itself highly heat resistant, which also increases cost.

(5) It is necessary to consider a circulation route that will not affect other equipment due to the increased temperature of the reactor.
The structure becomes complicated.

The object of the present invention is to eliminate the above-mentioned conventional drawbacks and provide a liquid-cooled wound core with excellent cooling effects.

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

FIG. 3 is a plan view showing an embodiment of the liquid-cooled wound core according to the present invention, and FIG. 4 is a front view thereof.

This embodiment has a wound core structure in which the core 1 is wound along a rectangular through window 2, and the upper and lower surfaces on which the core laminations are rolled, that is, the surface 3 where the end surfaces of each layer are visible, are cooling pipes 4 through which the liquid cooling medium passes. is in contact with the integrally attached cooling piece 5, and is sandwiched between the two cooling pieces 5.

The cooling piece 5 is made of a plate-shaped material such as copper having good thermal conductivity, and a thin insulating material 6 (for example, silicon compound) is inserted between it and the iron core 1.

In other words, it has a five-layer structure consisting of two cooling pieces 5, two insulating materials 6, and an iron core 1.

In general, the thermal conductivity in the direction perpendicular to the lamination direction (parallel to the lamination plane) is higher than that in the lamination direction of the iron core.
The heat is about 10 times more likely to be transferred to the end faces of each layer.

Therefore, the loss generated in the wound core 1 is guided in the direction of good thermal conductivity, from the plane 3 with a good cooling effect, passes through the insulating material 6 to the cooling piece 5, and is transferred to the outside by the liquid cooling medium passing through the cooling pipe 4. carried.

The insulating material 6 is originally intended to electrically insulate between the iron core 1 and the cooling piece 5 and to improve the electrical insulation at the end of the iron core.
It is inserted to the extent that it fills the gap between the iron core 1 and the cooling piece 5.

In other words, the thickness of the insulating material 6 can be selected to be around 1 mm at the thickest part to account for the unevenness of the iron core 1, so the temperature gradient here is small, and since it fills the air layer with high temperature insulation, the cooling effect can be improved. It works to enhance.

In addition, since this insulating material 6 comes into contact with the cooling piece 5 and is sufficiently cooled, it is possible to use insulating materials such as A and B types, which have low heat resistance and are inexpensive. can be obtained.

FIG. 5 is a perspective view showing the main parts of a modified example of the cooling piece.

This cooling piece 5A is provided with a liquid circulation hole 4A through which a liquid cooling medium directly flows therein, and the temperature gradient in the cooling piece 5A is reduced to enhance the cooling effect.

As mentioned above, the liquid-cooled wound core according to the present invention has the following excellent effects because it is arranged adjacent to the surface on which the winding layer of the wound core is coated and is provided with a cooling piece through which the cooling liquid refrigerant passes. have

(1) Effective cooling can be achieved by liquid cooling the surface from which the heat generated in the wound core is most easily extracted.

(2) The cooling piece is made of a metal with good thermal conductivity such as a copper plate,
By interposing a general-purpose insulating material such as a silicon compound between the wound core and the wound core, a cooling method that directs heat in a direction with good thermal conductivity can be realized without using a complicated mechanism.

(3) It is possible to increase the cooling effect by filling the air layer between the core surface and the cooling piece with the insulating material, and at the same time to improve the electrical insulation between the core layers at the ends.

(4) By lowering the temperature of the iron core, the heat resistance specifications of the iron core itself can also be lowered, which simplifies manufacturing, including selection of impregnating agents, and reduces costs.

(5) Since the heat resistance of equipment and parts surrounding the core can be lowered, costs can be reduced and the degree of freedom in design can be increased.

[Brief explanation of the drawing]

Fig. 1 is a plan view showing a conventional wound core, Fig. 2 is a front view thereof, Fig. 3 is a front view showing an embodiment of the liquid-cooled wound core according to the present invention, and Fig. 4 is a plan view thereof. FIG. 5 is a perspective view showing the main parts of another example of the cooling piece. In each figure, the same reference numerals indicate the same or corresponding parts, 1
3 is a wound core, 3 is a wound layer surface, 4 is a cooling pipe, 4A is a liquid flow hole, 5 and 5A are cooling pieces, and 6 is an insulating material.

Claims (1)

[Scope of utility model registration request] It has a wound core having a plurality of winding layers, and a cooling piece to which a cooling pipe through which a cooling liquid refrigerant for cooling the wound core is passed is integrally attached, and the winding layer surface of the wound iron core and the cooling piece are connected to each other. A liquid-cooled wound core characterized in that the core is fixed through an insulating material.