JPS6182699A - Induction heater and induction heating using the same - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] (Industrial Application Field) This invention is based on the natural phenomenon that when a good conductor such as a metal is placed in an alternating magnetic field, eddy current flows through it due to electromagnetic induction, causing the good conductor to generate heat. The present invention relates to an induction heating device using an induction heating device and an induction heating method using this device.

The object of this invention is that the object to be heated! This article provides an efficient induction heating device for long materials and an induction heating method using this device.

In this specification, thin material refers to narrow round rods, square rods, or wire rods with an outer diameter of φ35 or less or a corner of 25 wn or less, as well as pipes with a nominal size of 308 or less.

The material is not limited, and may be a good conductor such as iron, or a dark-colored material such as ceramic or vinyl.

(Prior Art) Conventionally, when heating an elongated material by induction heating, a method has been used in which high-frequency alternating current (3000 flz or more) is used to insert the elongated material into a hollow coil.

(Problems to be Solved by the Invention) This conventional method is inefficient because it can only heat the strips one by one, and it is also difficult to heat induction heating because the mass of the strips inserted through the coil is small and the high frequency is used. This effect occurs only on the surface of the elongated material and is not only small, but also has the problem that the elongated material made of an insulator such as ceramic cannot be heated.

This invention was completed to solve these problems.

(Another means to solve the problem) An induction heating element having two or more elongated holes through which the elongated material is inserted, and a hollow coil in which at least a part of the induction heating element is internally disposed, By providing an induction heating device in which the inner diameter of the hole is slightly larger than the outer diameter of the elongated material, and using this device, feeding the wire into the elongated hole at a predetermined speed while passing an alternating current through the coil, solve the problems.

(Example) Hereinafter, an example of the present invention will be described in detail based on the drawings.

FIG. 1 is a front view illustrating an induction heating device according to the present invention, and FIG. 2 is a sectional view taken along the line A-A in FIG. 1.

In Figures 1 and 2, ■ indicates an induction heating device, (2)
(3) is the frame of the coil (2);
(4) is a heat insulating material, the plate is an induction heating element that performs induction heating by electromagnetic induction, and (6) is a silicon steel plate.

The induction heating method consists of a coil (2), a frame (3), a heat insulator (4), an induction heating system, and a silicon steel plate (6).

The coil (2), the heat insulating material (4), and the induction heating blood vessel are arranged approximately concentrically.

The induction heating body has a plurality of basic elongated holes (7) drilled on the same circumference (a solid, thick-walled pipe-like cylinder (8) fits into these basic elongated holes (7)). It consists of a long and narrow pipe (9).

The cylinder (8) and the elongated pipe (9) are made of a good conductor.

The hollow part of the elongated pipe (9) is an elongated hole (11) through which an elongated material αω (wire in this example) to be heated is inserted.

A collar (9a) is provided at one end of the elongated pipe (9), and the other end (9b) protrudes from the end (5a) above the induction heating body.

The inner diameter (dl) of the elongated hole (11) is the elongated material 4101 (7
) The outer diameter (d2) is also slightly larger.

The inner diameter (d3) of the basic elongated hole (7) is set to φ5 to φ40.

Using this induction heating apparatus constructed as described above, the elongated material GO+ is efficiently (heated) in the following procedure.

■ AC current (5011z or 6
011y,), the induction heating device is heated by induction due to electromagnetic induction.

■ Measure the temperature of the induction heated blood with a thermometer (not shown).

■ After confirming that the temperature of the induction heating body wall 5 can be maintained at the specified temperature, insert the elongated material 00 into all the elongated holes (11).
is inserted at a constant speed in the direction of arrow (B).

(2) At this time, the elongated material 00) absorbs the temperature from above the induction heating element and is heated to a constant temperature. Incidentally, when the elongated material 00) is a good conductor, the elongated material αO) itself also receives induction heating due to the electromagnetic induction action and is promoted to be heated.

Furthermore, the phenomenon of this induced force p5 occurs most effectively when the inner diameter (di) of the elongated hole (11) and the outer diameter (d2) of the elongated material α0) are approximately equal.

(Effects of the Example) As explained above, the induction heating device (1) according to this example and the induction heating method using this device set simultaneously exhibit the following excellent effects.

■ Since it is induction heating, the temperature of the induction heating device rises quickly, so the device starts up quickly and is therefore efficient.

(2) Since a plurality of elongated holes (11) are provided, a large number of elongated materials aω can be heated at once, which is efficient.

■ Since the elongated holes (11) are provided on the same circumference of the induction heating blood vessel, and the coil (2), frame (3), and heat insulating material (4) are arranged approximately concentrically, each elongated material α0) There is no variation in temperature rise.

(2) Since a low frequency (5011z or 6011z) is used, the temperature on the induction heating body rises evenly not only on the surface but also inside the body, and an oscillation circuit is not required.

■ Even if the elongated material α0) is an insulator, it can be heated.

(2) If the material of the elongated material α0) is a good conductor that induces an induction heating effect, the elongated material α0) itself is also inductively heated by the electromagnetic induction action and its temperature is promoted. In addition, this elongated material 00)
It goes without saying that the induction heating phenomenon that occurs in the elongated material 00) occurs more effectively when the elongated material 00) is not hollow, such as a round bar, square bar, or wire.

■ A basic elongated hole (7) is provided for the induction heating phenomenon, and a elongated pipe (9) is fitted into this basic elongated hole (7).
By using the elongated pipe (9) having an elongated hole (11) with an inner diameter (di) corresponding to the outer diameter (d2) of the elongated material 00), the elongated material 00) can be heated with good efficiency.

■ A collar (9a) is provided on the elongated pipe (9), and the other end (
9b) protrudes from the end (5a) between the induction heating bodies, so it is easy to insert and take out the elongated pipe (9) into the induction heating phenomenon (when inserting, the flange (9a)
, and when taking it out, punch out the other end (9b)).

(2) Induction heating phenomenon - Since the pipe is shaped like a pipe and the silicon steel plate (6) is provided in the hollow part, the induction heating phenomenon occurs effectively.

In this invention, the shape between the induction heating bodies is not limited to this embodiment. For example, the shape between the induction heating bodies is not limited to that of this embodiment. The elongated hole (11) may be provided directly (the elongated pipe (9) is not necessarily required).

In this invention, the frequency of the alternating current flowing in the coil (2) can be suitably employed as long as it is a low frequency of about 25 tlz to 300011 z.

This is because if the frequency is lower than 2511z, the effect of electromagnetic induction is small, and the induction heating of the induction heating phenomenon is concentrated in the center, resulting in a problem that it is difficult to heat a large number of elongated materials 00). On the other hand, the frequency is 3000t
If it is larger than -1z, it is difficult to manufacture an oscillation circuit that flows a large current, and the induction heating phenomenon concentrates near the surface, and as a result, the ♀■ long material (101) cannot be heated.

In this invention, the material of the cylinder (8) is one that produces an induction heating effect (for example, one that is classified as JIS steel, excluding those that contain a large amount of N1% Cr, such as stainless steel or heat-resistant steel, or one that is classified as JIS steel). All aluminum alloys classified as non-ferrous (such as aluminum alloys) can be suitably used. In particular, it goes without saying that gray cast iron, spheroidal graphite cast iron, structural steel pipes, etc. are easily available and can be suitably used.

In this invention, the material of the elongated pipe (9) is as follows:
In addition to the same cylinder (8) as described above, an extremely long conductor such as copper or copper alloy can also be suitably used.

(Effects of the Invention) As explained above, the induction heating device according to the present invention and the induction heating method using this device simultaneously exhibit the following excellent effects.

■ Since it is induction heating, the heating of the induction heating element is quick.
The device starts up quickly and is therefore efficient.

■ Since multiple elongated holes are provided, many elongated materials can be heated at once.

■ Even if the elongated material is an insulator, it can be heated.

(81) If the material of the elongated material is a good conductor that induces induction heating, the elongated material itself will also be inductively heated by electromagnetic induction, promoting a rise in temperature.

[Brief explanation of the drawing]

FIG. 1 is a front view illustrating an embodiment of an induction heating device according to the present invention, and FIG. 2 is a sectional view taken along the line A--A in FIG. 1. (IL-m-induction heating device f2)-coil-induction heating body (7)-basic elongated hole (9)-elongated vibrator
α0) - Elongated material (11) - Elongated hole No. 1 Figure □ No. 0 Figure 1

Claims (3)

[Claims] (1) An induction heating device that performs induction heating by electromagnetic induction includes an induction heating body having two or more elongated holes through which elongated materials are inserted, and a hollow coil in which at least a portion of the induction heating body is internally installed. An induction heating device characterized in that the inner diameter of the elongated hole is slightly larger than the outer diameter of the elongated material. (2) The induction heating device according to claim 1, wherein the elongated hole comprises a basic elongated hole provided in the induction heating body and an elongated pipe fitted into the basic elongated hole. (3) In an induction heating method that performs induction heating by electromagnetic induction, an induction heating body having two or more elongated holes through which the elongated material is inserted, and a hollow coil in which at least a part of the induction heating body is internally installed. An induction heating method comprising: using an induction heating device in which the inner diameter of the elongated hole is slightly larger than the outer diameter of the elongated material, and feeding the wire into the elongated hole at a predetermined speed while passing an alternating current through the coil.