JPS591355Y2 - induction heating coil - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an induction heating coil, and particularly to an induction heating coil used in an induction cooking device.

Litz wires are widely known as induction heating coils used in induction heating cookers, but these litz wires have problems in that they are expensive and require time and effort to process.

Further, since a large current flows through the induction heating coil, self-heating occurs, and radiation or conduction heat from the object to be heated is also added, and the coil itself is heated to a considerably high temperature.

This heating temperature reaches about 180° C., but litz wires used at this temperature are much more expensive than those used at room temperature, and have poor workability.

The present invention has been made in view of these points, and one embodiment will be described below based on the drawings.

In FIG. 1, 1 and 2 are spiral induction heating coils made of conductive plates such as copper or aluminum, respectively.
It is formed by punching a conductive plate such as a copper plate or an aluminum plate.

In this case, the punching pattern is designed so that when the punched portion and the remaining portion are reversed, they will have the same pattern.

Reference numeral 3 denotes an insulating member, such as a glass fiber sheet, which is interposed between the two induction heating coils 1 and 2, and has a hole 4 formed in its center.

The induction heating coils 1 and 2 are arranged with the front and back reversed,
The center portions are connected within the hole 4 by solder, rivets, or the like.

FIG. 2A 90 shows a plan view and a sectional view of the same embodiment, and shows the arrangement relationship between the induction heating coils 1 and 2.

The arrangement of both coils 1.2 is set so that the spiral direction from the outside to the inside of the induction heating coil 1 on the top surface and the spiral direction from the inside to the outside of the induction heating coil 2 on the bottom surface are in the same rotation direction. .

The thickness of the induction heating coils 1 and 2 is approximately 1 mm, and the width is approximately 1Qm.
The appropriate thickness is approximately
mm to 2. □mm, and the width can be set arbitrarily from a range of approximately 5 mm to 15 mm.

The thickness of the coils 1 and 2 is determined based on the fact that the area through which current flows due to the skin effect is approximately Q, 5 mm, and the width is determined based on the outer shape of the entire coil and the number of turns.

For example, the diameter of the coil is about 20 cm, the number of turns is 2, and there are 10 coils (
turn), the width of the winding is lQmm, and the pitch is 2
It becomes 0mm.

The edges of the induction heating coils 1 and 2 having the above structure can be bent by press processing or the like to have an L-shaped or U-shaped cross section, thereby increasing their mechanical strength and making them easier to handle. .

As described above, the induction heating coil of the present invention has two patterns that are the same when one conductive plate is punched out and one side is turned upside down.
Since the spiral coils are arranged so that the current direction is constant, the conductive plates can be used without waste.

Further, since the conductive plate is made of a relatively inexpensive material such as a copper plate or an aluminum plate, and is formed by a simple method of punching, manufacturing costs can be kept low.

[Brief explanation of drawings]

1 is an exploded perspective view of an embodiment of the present invention, FIG. 2A is a plan view of the same side, and FIG. 2A is a sectional view taken along line II' in FIG. 1.2... Induction heating coil, 3... Glass fiber sheet, 4... Hole.

Claims (1)

[Scope of utility model registration request] Two spiral induction heating coils formed by punching out a conductive plate so that the punched part and the remaining part have the same pattern are overlapped with an insulating member in between, with one coil being reversed relative to the other coil. An induction heating coil in which both coils are connected at the center.