JP2001267051A - Heating element for electromagnetic induction heating - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heating element for electromagnetic induction heating with high heating efficiency. SOLUTION: The heating element 1 generates heat by electromagnetic induction. The heating element 1 is provided with several conductive pipes 2 to 4 and fixing means 5 fixing each conductive pipe with the other. The heating element for electromagnetic induction heating 1 is structured in a stable connected condition of respective conductive pipes 2 to 4. Thus fixing each conductive pipe with the other with the fixing means, the conductive pipes 2 to 4 are all connected stably, then an electrical load of the heating element for electromagnetic induction heating 1 becomes stable, and, therefore, the matching of electrical load with each characteristic value is in the best and most stable condition, and the maximum high heating efficiency is provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heating element for electromagnetic induction heating which heats a heating element which is heated by alternately generating an eddy current.

[0002]

2. Description of the Related Art When a fluid is heated by a heating element for electromagnetic induction heating, only a heating element having a thickness necessary for effectively transferring heat to the fluid by a contact surface between the heating element and the fluid or heat conduction. Heating is sufficient, and such a region will generally be cylindrical if the fluid passage is circular. For this reason, in order to achieve efficient heating of the fluid with the induction heating element with the smallest heat capacity, it is necessary to configure an electromagnetic induction heating element in which a plurality of stainless steel tubes with specified outer diameters and plate thicknesses are bundled. Is suitable.

[0003]

However, the conventional heating element for electromagnetic induction heating has a problem that the heating efficiency is poor.

[0004] The present invention has been made in view of the above problems, and an object of the present invention is to provide a heating element for electromagnetic induction heating having good heat generation efficiency.

[0005]

Means for Solving the Problems In order to solve the above-mentioned problems, the present inventors have made intensive studies and as a result found out the cause of deterioration of the heat generation efficiency of the conventional heating element for electromagnetic induction heating. Since a passivation film is formed on the surface of the stainless steel pipe, the contact resistance of the stainless steel pipe is generally much higher than that of gold, silver, copper, etc., except immediately after polishing. When stainless steel pipes having this characteristic are bundled, the places where they come into strong contact make electrical contact, but the places where they come into weak contact do not come into electrical contact. In this way, since the weak contact does not reach the electrical contact state, the heating element that simply bundles stainless steel pipes,
The electrical load becomes unstable. Further, the thickness of the passivation film changes depending on the environment such as temperature and humidity, and accordingly, the contact resistance also changes. As described above, since the electrical contact state changes every moment under the influence of the environment, the electrical load of the heating element in which the stainless steel tubes are bundled becomes unstable. The electric load is an inductance or an equivalent resistance measured when a coil is wound around a stainless steel tube bundle.

If the electrical load is unstable for the above reasons, various characteristic values such as the frequency of a power supply for supplying a high frequency to the heating element for electromagnetic induction heating, the oscillation voltage width, and the voltage waveform may be changed for each individual electromagnetic induction heating. It may be necessary to adjust each time to match the electrical load of the heating element for heating, and various characteristics of high-frequency power supply etc. may be adapted to the fluctuation of the electrical load of the heating element for electromagnetic induction heating due to daily environmental changes. The value must be adjusted each time. However, even if the various characteristic values are adjusted, if the electric load of the heating element for electromagnetic induction heating changes, the matching between the electric load and the various characteristic values deteriorates. The knowledge that the high frequency power supply is damaged was obtained.

The invention according to claim 1, which has been completed based on the above knowledge, is a heating element which generates heat by heating by electromagnetic induction, and comprises a plurality of conductive pipes and a fixed part for fixing the conductive pipes to each other. Means, wherein the conductive pipes are heating elements for electromagnetic induction heating formed in a stable connection with each other.

As described above, since the conductive pipes are fixed to each other by the fixing means, the conductive pipes do not vibrate or sway even when a fluid flows through the conductive pipes. The body's electrical load stabilizes. Therefore, matching between the electrical load and various characteristic values such as the frequency of the power supply, the oscillating voltage width, and the voltage waveform can be optimally and stably performed, and the matching does not deteriorate. At the same time, damage to the high-frequency power supply can be prevented. Further, the heating element for electromagnetic induction heating according to the present invention,
Since it is formed of a plurality of conductive pipes, heat generation efficiency is higher than that of a heating element for electromagnetic induction heating formed of a single conductive pipe. The electric load is an inductance or an equivalent resistance measured when a coil is wound around the heating element for electromagnetic induction heating of the present invention.

According to a second aspect of the present invention, in addition to the configuration of the first aspect, the fixing means is formed of a conductive material, and the conductive pipes are formed in an electrically connected state to each other. Heating element for electromagnetic induction heating. In this manner, by fixing the conductive pipes to each other with the fixing means formed of a conductive material, all the conductive pipes having a large contact resistance can be electrically connected to each other. The electrical load stabilizes. Therefore, matching between the electrical load and various characteristic values such as the frequency of the power supply, the oscillating voltage width, and the voltage waveform can be optimally and stably performed, and the matching does not deteriorate. At the same time, damage to the high-frequency power supply can be prevented.

According to a third aspect of the present invention, in addition to the configuration of the first or second aspect, the plurality of conductive pipes are arranged on the radiation, and the thickness of the conductive pipe is
The electromagnetic induction heating element is formed to be thicker as the conductive pipe is arranged closer to the center. In this way, by forming the conductive pipe closer to the center to be thicker, the fluid to be heated can be uniformly heated.

According to a fourth aspect of the present invention, in addition to the configuration of the first aspect, the fixing means fixes the conductive pipes at a predetermined interval from each other, It is a heating element for electromagnetic induction heating formed of a plate material extending along the axial direction of the conductive pipe. In the present invention, the fluid to be heated passes through the inside and outside of the conductive pipe. However, since the conductive pipes are fixed at a predetermined distance from each other, it is easy to clean the outer peripheral surface of the conductive pipe and the fixing means. Can be done.

According to a fifth aspect of the present invention, in addition to the configuration of the fourth aspect, the fixing means is a heating element for electromagnetic induction heating, which is formed detachably from the conductive pipe. As an example of the case where it is formed so as to be removable, a groove is formed on the outer peripheral surface of the conductive pipe for fitting the fixing means formed of a plate material, and the fixing means and the conductive pipe are fitted. If it is. As described above, since the fixing means and the conductive pipe can be separated at the time of cleaning by being formed to be removable, the fixing means and the conductive pipe can be thoroughly washed.

According to a sixth aspect of the present invention, in addition to the configuration of any one of the first to third aspects, the conductive pipes are bundled, and the fixing means is connected to each of the conductive pipes. The electromagnetic induction heating element is formed by a member that is surrounded by an outer peripheral surface of the conductive pipe and that is filled with at least axially both ends of the conductive pipe. In the case where the heat insulating material and the coil are wound directly along the outer circumference of the bundled conductive pipe, the gap surrounded by the outer peripheral surface of each conductive pipe is filled at both ends in the axial direction of the conductive pipe so that the flowable food can be obtained. Even when the liquid food flows, the liquid food does not enter the gap, so that the liquid food is not trapped in the gap as in the related art. For this reason, it is possible to prevent a state in which the fluid food cannot be removed even by washing after being heated and cured, and the danger of bacteria growing there is also eliminated. As in the case of the flowable food, the flowable heated product, that is, a chemical product such as a drug or a resin, has the same effect of being washed out when a polymer or a deposit adheres to the surface of the heating element.

According to a seventh aspect of the present invention, in addition to the structure of the sixth aspect, the member is formed by electromagnetic induction heating in which an outer peripheral surface of the conductive pipe is continuously formed along an axial direction. Heating element. When the bundled conductive pipe is inserted into a pipe through which a fluid passes, and a coil is wound from above the pipe, the fluid food to be heated passes through the inside and outside of the conductive pipe. , Even in that case,
Since the gap surrounded by the outer peripheral surface of each conductive pipe is continuously filled, the fluid food does not enter the gap, so that the fluid food is not trapped in the gap as in the related art. For this reason, it is possible to prevent a state in which the fluid food cannot be removed even by washing after being heated and cured, and the danger of bacteria growing there is also eliminated. As in the case of the flowable food, the flowable heated product, that is, a chemical product such as a drug or a resin, has the same effect of being washed out when a polymer or a deposit adheres to the surface of the heating element.

According to an eighth aspect of the present invention, in addition to the structure of any one of the first to seventh aspects, the plurality of conductive pipes are made of stainless steel for electromagnetic induction heating. It is a heating element. The martensitic or ferritic stainless steel is suitable for the conductive pipe. This is because electromagnetic induction heating can be performed with higher efficiency. In addition, the conductive pipe is SUS444, SUS44
A ferritic stainless steel having a high Cr content such as 7 is preferable. This is because the corrosion resistance of the heating element for electromagnetic induction heating can be sufficiently ensured.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a first embodiment of the present invention will be described with reference to the drawings. As shown in FIG. 1, the heating element 1 for electromagnetic induction heating includes three conductive pipes 2 to 4 having the same shape.
, A fixing plate 5, and flanges 6 to 8, and each of the conductive pipes 2 to 4 spaced at a predetermined interval is integrally fixed by the fixing plate 5.

The conductive pipes 2 to 4 are made of stainless steel. When a magnetic flux is generated in the pipes, an eddy current flows to generate heat. Further, the thickness and the axial length of the conductive pipes 2 to 4 are formed to predetermined thicknesses and lengths.

The fixed plate 5 is formed by three blades 5a to 5c, and is formed to extend along the axial direction of the conductive pipes 2 to 4. The wings 5a to 5c have a Y-shaped cross section as shown in FIG.
5c is formed in a predetermined length such that the conductive pipes 2 to 4 are arranged at predetermined intervals. Each of the wings 5a to 5c is formed of stainless steel, which is a conductive material, and is welded to the outer peripheral surfaces of the corresponding conductive pipes 2 to 4, thereby electrically connecting the conductive pipes 2 to 4 to each other. Connected. That is, the fixing plate 5 is formed of a conductive material, electrically connects the conductive pipes 2 to 4, and integrally fixes the conductive pipes 2 to 4 arranged at predetermined intervals. It has become.

The flanges 6 to 8 are connected to the respective conductive pipes 2 to 4
The heating element 1 for electromagnetic induction heating inserted into the pipe 9 forming the fluid passage is fixed to the inner peripheral face of the pipe 9.

The number of heating elements 1 for electromagnetic induction heating is not limited to three when the number of conductive pipes is two or more. Therefore, as shown in FIG.
0 to 13 or as shown in FIG.
May be provided with a conductive pipe 14 disposed at the center of the above, and eight conductive pipes 15 to 22 disposed radially around the conductive pipe 14.

The fixed plate 23 of the type shown in FIG. 3 has four blades 23a to 23a extending in the axial direction of the conductive pipes 10 to 13.
23d, and the cross section is formed in a cross shape. The lengths of the wings 23a to 23d in the width direction are formed to have a predetermined length such that the conductive pipes 10 to 13 are arranged at predetermined intervals, similarly to the fixing plate 5 of FIG. Each of the wings 23a to 23d is made of stainless steel, which is a conductive material.

In the heating element for electromagnetic induction heating of the type shown in FIG. 4, the inner diameter of the conductive pipe 14 arranged at the center is formed larger than the inner diameter of each of the conductive pipes 15 to 22 arranged on the radiation. In addition, the thickness of the conductive pipe 14 disposed at the center is formed to be thicker than the thickness of each of the conductive pipes 15 to 22 disposed on the radiation. This is for uniformly heating the fluid passing through the pipe 9 and the conductive pipes 14 to 22.

The fixing plates 24-31 of the type shown in FIG.
It is a plate-like body extending in the axial direction of the conductive pipes 15 to 22. The length of the fixing plates 24 to 31 in the width direction is the same as that of the fixing plates 5 and 23 in FIGS. 2 and 3, and the conductive pipe 14 and the conductive pipes 15 to 22 disposed therearound have a predetermined distance. Is formed to have a predetermined length so as to be spaced apart from each other. The fixing plates 24 to 31 are made of stainless steel, which is a conductive material, like the fixing plates 5 and 23 in FIGS. 2 and 3.

The conductive pipes 2 to 4 and 10 to 22 are
Since heat is generated by the generation of an eddy current, it is only necessary to be formed of a conductive material, and is not limited to stainless steel. In addition, the solid plates 5, 23 to 31 need only be electrically connected to all the conductive pipes, and may be formed of a conductive material, and are not limited to stainless steel.

As described above, in the heating element 1 for electromagnetic induction heating according to the first embodiment, since all the conductive pipes 2 to 4 are electrically connected, the electric load is stabilized. In addition, since the conductive pipes 2 to 4 are arranged at predetermined intervals by the fixing plate 5, even when a fluid food is heated as the fluid to be heated, the heating of the heating element 1 for electromagnetic induction heating becomes easy. Also, the fluid food does not adhere to the outer peripheral surfaces of the conductive pipes 2 to 4 and harden.

The conductive pipes 2 to 4, 10 to 13, and 14 to 22 of the heating element 1 for electromagnetic induction heating according to the first embodiment.
May be provided with one or more holes. Since the heating element 1 for electromagnetic induction heating is used by being inserted into the pipe 9 which is a fluid passage, the fluid flows through the conductive pipes 2 to 4 and 1.
It passes inside and outside 0-13 and 14-22. When one or a plurality of holes are provided on the side surfaces of the conductive pipes 2 to 4, 10 to 13, and 14 to 22, the fluid flowing in the conductive pipe and the fluid flowing outside the conductive pipe enter and leave each other through the holes. As a result, turbulence occurs and the heat transfer coefficient is improved.

Next, a second embodiment will be described with reference to the drawings. As shown in FIG. 5, the heating element 41 for electromagnetic induction heating
Has seven conductive pipes 42 to 48 and fixing members (fixing means) 49 and 50, and the bundled conductive pipes 42 to 48 are integrally fixed by the fixing members 49 and 50. It is formed.

The conductive pipes 42 to 48 are made of stainless steel as in the first embodiment.
When a magnetic flux is generated, an eddy current flows to generate heat. Further, the thickness of the conductive pipe 42 arranged at the center is formed thicker than the thickness of the conductive pipes 43 to 48 arranged around. Further, similarly to the first embodiment, the thickness and the axial length of the conductive pipes 42 to 48 are formed to predetermined thicknesses and lengths.

The fixing members 49 and 50 are formed in a cylindrical shape so as to cover both ends in the axial direction of the bundled conductive pipes 42 to 48 by a predetermined length L.
It is formed so as to fill each of the triangular gaps formed by the outer peripheral surfaces of No. to No. 48 by a predetermined length L. The fixing members 49 and 50 are formed of a conductive material such as a braze. As described above, the fixing members 49 and 50 electrically connect the conductive pipes 42 to 48 to each other by filling the triangular gaps formed on the outer peripheral surfaces of the conductive pipes 42 to 48. At the same time, the gap is closed so that the fluid to be heated does not flow into the gap between the bundled conductive pipes 42 to 48.

Since the conductive pipes 42 to 48 generate heat due to the generation of eddy current, they need only be formed of a conductive material, and are not limited to those made of stainless steel.
The fixing members 49 and 50 are not limited to brazing, but may be a conductive material such as an aluminum solder or a sintered alloy. Further, the fixing members 49 and 50 are connected to the respective conductive pipes 42.
The gaps formed by the outer peripheral surfaces of No. to No. 48 may be closed by welding.

In the heating element 41 for electromagnetic induction heating according to the second embodiment, since all the conductive pipes 42 to 48 are electrically connected, the electric load is stabilized. In addition, as shown in FIG. 6, the heat generating body 41 for electromagnetic induction heating has the heat insulating material 53 wound directly along the outer circumference of the fixing members 49 and 50, so that the flowable food is flowed through the conductive pipes 42 to 48. Also,
Parts not covered by the fixing members 49 and 50 and the fixing members 4
Fluid food does not enter the portions not filled with 9, 50. Therefore, cleaning of the heating element 41 for electromagnetic induction heating becomes easy.

As shown in FIG. 7, when a heating element 61 for electromagnetic induction heating is inserted into a pipe 56 through which a fluid passes and a coil is wound from above the pipe 56, the fluid to be heated is electrically conductive. It passes through the inside and outside of the sex pipes 42-48. For this reason, when the fixing members 49 and 50 buried by the predetermined length L as shown in FIG.
Fluid food enters into the gaps between the portions where 9 and 50 are not filled. Therefore, when the heating element 61 for electromagnetic induction heating is inserted into the pipe 56 as shown in FIG. 7, the fixing member 57 has the same length as the axial length of the conductive pipes 42 to 48 as shown in FIG. Embedded continuously in the length or continuously welded. This prevents the liquid food from entering the gap surrounded by the outer peripheral surfaces of the conductive pipes 42 to 48.

The heating element 1 for electromagnetic induction heating according to the first embodiment and the heating element 4 for electromagnetic induction heating according to the second embodiment.
The shape of each of the conductive pipes 1 and 61 is cylindrical,
The present invention is not limited to this, and may be a square pipe or a trumpet-shaped conductive pipe having one end wider than the other end. Alternatively, a conductive pipe having a shape obtained by twisting each cylindrical conductive pipe may be used. In this case, since the fluid is turbulent due to the twisted portion in the conductive pipe, the heat transfer coefficient is improved.

The fixing plates 5, 23 of the heating elements 1, 41, 61 for electromagnetic induction heating according to the first and second embodiments.
Although the fixing means of the fixing members to 31 and the fixing members 49, 50, 57 are described as being formed of a conductive material, the present invention is not limited to this, and they may be formed of a non-conductive material. When formed of a non-conductive material, the conductive pipes are insulated from each other, but also when connected in an insulated state, the electrical load is stable. That is, the fixing means may be made of a conductive material or a non-conductive material, and is formed so as to maintain a stable connection state so that each conductive pipe does not vibrate or shake when a fluid flows through the conductive pipe. Anything can be used.

[0035]

EXAMPLE Next, a heat generation test was conducted using the heating element 41 for electromagnetic induction heating according to the second embodiment. The test conditions are as follows.

<Configuration of Heating Element for Electromagnetic Induction Heating> As shown in FIG. 5, the number of conductive pipes was seven. The material of the conductive pipe was SUS444 (ferritic stainless steel) and 19Cr-2Mo. The dimensions of one conductive pipe arranged at the center were 10 mm in outer diameter, 4 mm in inner diameter, and 250 mm in length. In addition, the dimensions of the six conductive pipes arranged around the outer diameter are 10 mm, the inner diameter is 8 mm, and the length is 250 mm.
And The fixing member was formed of brazing, and the length L from both ends of the conductive pipe was 4 mm. However, the fixing member was not formed so as to cover each conductive pipe in a cylindrical shape as shown in FIG. 5, but was formed so as to cover along the outer periphery of the conductive pipe as shown in FIG.

FIG. 9 is a side sectional view showing a state in which flanges 51 and 52 are attached to both ends of the heating element 41 for electromagnetic induction heating. FIG. 10 is a diagram showing both ends of the heating element 41 for electromagnetic induction heating. As shown in FIGS. 9 and 10, flanges 51 and 52 were attached to both ends of the heating element 41 for electromagnetic induction heating of the example, and the contact portion was completely brazed. Further, a heat insulating material 53 containing aluminum oxide and silicon dioxide as main components was wound around the electromagnetic induction heating element 41, and a heat resistant coil 54 was wound around the outside of the heat insulating material 53. Further, a heat-resistant material 55 was wound around the outside of the heat-resistant coil 54.

<Actual machine test> When a sine wave of 25 kHz and 200 V is applied from a high frequency power supply to this electromagnetic induction heating element 41, the inductance is 31.7 μH, the equivalent resistance is 2.1Ω, and the peak current is 28. 8A, the electric load was stabilized, and heat was efficiently generated. In this state, when air was allowed to flow into the conductive pipe from one end and passed therethrough, rapid heating was achieved, and hot air or hot air was obtained.

[0039]

According to the first or second aspect of the present invention, each conductive pipe is fixed to each other by fixing means.
Even if a fluid flows through each conductive pipe, each conductive pipe does not vibrate or swing, so that the electrical load of the electromagnetic induction heating heating element is stabilized. Therefore, matching between the electrical load and various characteristic values such as the frequency of the power supply, the oscillating voltage width, and the voltage waveform can be optimally and stably performed, and the matching does not deteriorate. At the same time, there is an effect that breakage of the high frequency power supply can be prevented. Further, since the heating element for electromagnetic induction heating according to the present invention is formed of a plurality of conductive pipes, the heating efficiency is better than that of the heating element for electromagnetic induction heating formed of a single conductive pipe.

According to a third aspect of the present invention, in addition to the effects of the first or second aspect of the present invention, the fluid to be heated can be made uniform by forming the conductive pipe closer to the center to be thicker. Can be heated.

According to a fourth aspect of the present invention, in addition to the effect of the first aspect of the present invention, the fluid to be heated passes through the inside and outside of the conductive pipe. Since the pipes are fixed at a predetermined interval from each other,
There is an effect that the outer peripheral surface of the conductive pipe and the fixing means can be easily cleaned.

According to a fifth aspect of the present invention, in addition to the effects of the first to fourth aspects of the present invention, the fixing means and the conductive pipe are formed at the time of cleaning by being detachably formed. Since the separation can be performed, the fixing means and the conductive pipe can be thoroughly washed.

According to a sixth aspect of the present invention, in addition to the effect of the first aspect of the present invention, a case where a heat insulating material and a coil are directly wound along the outer periphery of the bundled conductive pipes. By filling the gap surrounded by the outer peripheral surface of each conductive pipe with both ends in the axial direction of the conductive pipe, even if the fluid food flows, the fluid food does not enter the gap, as in the past. In addition, the liquid food is not trapped in the gap. For this reason, it is possible to prevent a state in which the fluid food cannot be removed even by washing after being heated and cured, and it is possible to eliminate the risk of bacteria growing in that portion.

According to the present invention, in addition to the effect of the present invention, the bundled conductive pipe is inserted into a pipe through which a fluid passes, and a coil is wound from above the pipe. Means that the fluid food that is the fluid to be heated passes through the inside and outside of the conductive pipe, but even in this case, the gap surrounded by the outer peripheral surface of each conductive pipe is continuously filled, Since the fluid food does not enter the gap, the fluid food is not trapped in the gap as in the related art. For this reason, it is possible to prevent a state in which the fluid food cannot be removed even by washing after being heated and cured, and it is possible to eliminate the risk of bacteria growing in that portion.

According to the eighth aspect of the present invention, in addition to the effect of the first aspect of the present invention, when a conductive pipe is formed of martensitic or ferritic stainless steel, electromagnetic induction heating is achieved. Can be performed with higher efficiency. Also, SUS444,
When the conductive pipe is formed of a ferritic stainless steel having a high Cr content such as SUS447, the effect is obtained that the corrosion resistance of the heating element for electromagnetic induction heating can be sufficiently ensured.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating a heating element for electromagnetic induction heating according to a first embodiment.

FIG. 2 is a sectional view of the heating element for electromagnetic induction heating shown in FIG. 1;

FIG. 3 is a diagram illustrating another form of the heating element for electromagnetic induction heating according to the first embodiment.

FIG. 4 is a diagram illustrating another form of the heating element for electromagnetic induction heating according to the first embodiment.

FIG. 5 is a diagram illustrating a heating element for electromagnetic induction heating according to a second embodiment.

6 is a cross-sectional view when a heat insulating material is wound around the heating element for electromagnetic induction heating shown in FIG.

FIG. 7 is a sectional view of the heating element for electromagnetic induction heating shown in FIG. 8;

FIG. 8 is a diagram illustrating another embodiment of the heating element for electromagnetic induction heating according to the second embodiment.

FIG. 9 is a view for explaining an electromagnetic induction heating heating element shown in FIG. 5 with flanges attached to both ends.

FIG. 10 is a view of FIG. 9 as viewed from both ends.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Heating element for electromagnetic induction heating 2-4 Conductive pipe 5, 23-31 Fixing plate 6-8 Flange 9, 56 Pipe 10-13 Conductive pipe 14 Conductive pipe 15-22 Conductive pipe 41, 61 Electromagnetic induction heating Heating element 42-48 Conductive pipe 49, 50, 57 Fixing member

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Tetsutaro Ogushi 5-30-7 Shiba, Minato-ku, Tokyo Inside Nippon Metal Corporation (72) Inventor Takehisa Konishi 5-30-7 Shiba, Minato-ku, Tokyo Within Nippon Metal Co., Ltd. Taizo Kawamura 19-21 Misawa-cho, Ibaraki-shi, Osaka F-term (reference) in Seta Giken Co., Ltd. 3K059 AB23 AD38 CD52

Claims (8)

[Claims] 1. A heating element which generates heat by heating by electromagnetic induction, comprising: a plurality of conductive pipes; and fixing means for fixing the conductive pipes to each other, wherein the conductive pipes are connected to each other in a stable manner. A heating element for electromagnetic induction heating formed in a state. 2. The heating element for electromagnetic induction heating according to claim 1, wherein said fixing means is formed of a conductive material, and said conductive pipes are formed in a state of being electrically connected to each other. 3. The conductive pipe according to claim 1, wherein the plurality of conductive pipes are arranged radially, and the thickness of the conductive pipe is thicker as the conductive pipe is arranged closer to the center. 2. The heating element for electromagnetic induction heating according to item 1. 4. The fixing means according to claim 1, wherein said fixing means fixes said conductive pipes at a predetermined distance from each other, and is formed of a plate material extending along an axial direction of said conductive pipes. The heating element for electromagnetic induction heating according to any one of the above. 5. The heating element for electromagnetic induction heating according to claim 4, wherein said fixing means is formed so as to be detachable from said conductive pipe. 6. The conductive pipes are bundled, and the fixing means is surrounded by an outer peripheral surface of each of the conductive pipes, and has a gap extending in an axial direction at least at both axial ends of the conductive pipe. The heating element for electromagnetic induction heating according to any one of claims 1 to 3, wherein the heating element is formed of a filling member. 7. The heating element for electromagnetic induction heating according to claim 6, wherein the member is formed continuously along an axial direction on an outer peripheral surface of the conductive pipe. 8. The heating element for electromagnetic induction heating according to claim 1, wherein the plurality of conductive pipes are formed of stainless steel.