JPS63110611A - Output transformer - Google Patents

Abstract

PURPOSE:To unnecessitate the winding of a coil for cooling water inside a transformer by a method wherein the cooling efficiency of the device is increased by directly using the secondary side winding as a heat pipe, and radiation fins are attached to the other end of the heat pipe which is brought out to outside the coil, or the heat pipe is cooled with water. CONSTITUTION:The secondary side coil 1 shown in the diagram indicates the single-wound type, and it is formed in the shape where is surrounding a magnetic core using a plane-surfaced plate which is brought in line with the size of a magnetic core. The cooling pipe 2, to be used for heat radiation, is directly wound on the secondary side coil 1, or it is wound on the secondary side coil with an electric insulated layer 5 placed between the cooling pipe 2 and the secondary coil 1. A conducting wire, on which an electric insulating coating 5 is performed on the surface where an electric insulating material wound on the secondary side coil 1, is wound on the primary coil 3. A finishing winding is performed on the whole surface of the secondary side coil 1 and the primary coil 3, for which a winding operation is finished, of a transformer. As a result, the pipe arrangement for cooling by water inside the transformer is unnecessitated, and the method of water cooling can be simplified.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an output transformer configured to rapidly radiate heat generated by an output transformer with a large output used in a high frequency induction heating device or the like.

The high frequency induction heating device has a frequency of 201 Hz or more, and some products are used in the MHz band.

On the other hand, in order to achieve impedance matching between the oscillation circuit and the load heating coil, it is necessary to use a transformer between the oscillation circuit and the load heating coil, and since the secondary side has low impedance, it is necessary to use a transformer between the oscillation circuit and the load heating coil. The secondary winding is 1
It consists of a volume or several volumes. On the other hand, the transformer for high 1M wave induction heating equipment has a high excitation frequency, so the transformer has a large transmission capacity and a small shape. For this reason, the heat generated due to transmission loss inside the transformer is more than two orders of magnitude more heat per volume than transformers used at commercial frequencies, and the output of devices with large power capacity is In transformers, the heat dissipation means for this purpose is: 1. In order to match the impedance of the heating coil, the secondary coil has one or several turns, and a copper vibe for water cooling is directly brazed to the secondary coil. Alternatively, the electrical insulator is placed in close contact with an object so that the heat generated in the coil or magnetic core is radiated to the outside of the transformer.

Braze a steel vibrator for water cooling directly to the secondary coil, or
The method of radiating the heat generated in the transformer by bringing the transformer into close contact with each other through a t'X gauze material has a large cooling effect and is simple.

The present invention uses a heat pipe directly to the secondary coil as a heat generation method for such a transformer, which allows for more efficient cooling of the device. The present invention provides a transformer that can be easily electrically insulated without being wrapped around the transformer.

Next, the present invention will be explained.

Figure 1 is a diagram showing the internal structure of the output transformer of a high-frequency induction heating device. 1 is the secondary coil, and in this example it is a one-turn case. It has a shape that surrounds the 2 is a cooling vibrator for heat dissipation,
It can be wrapped directly around the secondary coil, or it can be wrapped around the secondary coil with an electrical insulation layer placed between it and the secondary coil.

Figure 2 is a diagram showing the structure of the secondary coil of the transformer.

Figures 1 and 3 show the primary coil, in which electrical insulation is wrapped around the secondary coil, and a conducting wire is wrapped with electrical insulation. After the transformer's secondary coil and primary coil are wound up, they are finished by wrapping them all with electrical insulating tape (No. 4).

Figures 3(a) and 3(b) show heat dissipation using a heat pipe when the secondary coil of the transformer of the present invention has one turn.In this example, fins are used as the heat dissipation method. A water-cooled vibrator may be used instead of the heat dissipation fin. 1 is
It is a coil made by winding a steel plate, and a heat pipe is used as a T1 gas conductor from both ends of the coil.
The terminal M' is connected to part 8. At one end of the heat pipe, a heat dissipation fin or a water-cooled cooling vibe is attached to dissipate heat.

Furthermore, although the example shown in FIG. 3 is a method of radiating heat by wrapping a heat pipe around a one-turn coil on the secondary side, it is also possible to use a method in which the heat pipe itself is made into a flat plate shape and shared with the coil.

A heat pipe is a device that has a metal mesh called a wick placed inside a high-pressure steel vibrator, and has a high heat transfer ability because it has water inside it under reduced pressure. The outer shell of the heat pipe is made of copper, which has good thermal conductivity, and since copper is also a good conductor of electricity, it is used as a conductor for dissipating heat and transmitting power.

Figures 4(a) and 4(b) show a heat pipe formed into a coil shape, which serves both as an electric conductor and as a heat dissipator. 8 is an electric terminal from which current is taken out.

9 is a cooling vibrator that has high-pressure water passed through it.The heat generated inside the transformer is transferred to the outside of the transformer via a heat pipe, and the heat led outside the transformer is cooled by water cooling.

It is an output transformer with an output of 5 KW and an efficiency of 90%, the secondary winding is one turn, heat is transferred by a heat pipe as shown in Figure 3, and the other end of the heat pipe is cooled by direct water cooling. Ta.

The heat pipe is made of copper and has an outer diameter of +5. Oa/raφ, the working fluid was water, and the temperature inside the transformer of the secondary coil was 62°C at a temperature of 4°C and 20°C.

The method of the present invention does not require winding a vibrator for water cooling inside the transformer, and therefore, the method of applying water cooling is easy to handle and operate, and is practical and industrially useful.

Further, although this embodiment is a soil quadrance for a high-frequency induction heating device, it goes without saying that the present invention can also be applied to heat radiation of an output transformer used in other high-frequency devices.

[Brief explanation of the drawing]

Figure-1, High 1ffl wave induction heating equipment, output transformer 2
The figure which shows the structure of the transformer when water-cooling the next coil. 2 is a diagram showing a method of cooling a transformer and a secondary coil in the method of FIG. 2 and FIG. 1; FIG. Figure 3: Heat pipe arrangement, radiation fins, and electrical terminals when using the heat pipe of the present invention. IA-4 is a diagram of a configuration when the heat pipe of the present invention is used as a transformer secondary coil. l...Conductor of the secondary coil of the transformer (1 turn), 2
...Water-cooled vibrator, 3...Conductor of transformer primary coil, 4.5...Electrical insulation, 6...Magnetic core, 7.
...Heat pipe, 8...Electric terminal, 9...Radiating fin, lO...Water cooling vibrator.

Claims (1)

[Claims] The secondary winding of the output transformer is used as a direct heat pipe,
An output transformer that cools the other end of the heat pipe taken out to the outside of the coil by attaching heat radiation fins or by water cooling.