JP2002164158A - Fluid heating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fluid heating device having a heat radiation body enabled to efficiently perform a thermal conversion, hardly generating uneven heating. SOLUTION: The fluid heating device comprises one or a plurality of porous foamed bodies, an induction heating coil for induction-heating the foamed bodies, an intermediate frequency oscillator supplying a current to the induction heating coil, and a fluid path through which, the fluid to be heated by the heat generated at the foamed bodies flows. A core body forming a closed circuit, is arranged so that the core body penetrates through the central part of the foamed body and the induction heating coil.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an apparatus for heating a fluid, and more particularly, to an apparatus for heating a fluid by electromagnetic induction heating.

[0002]

2. Description of the Related Art A general structure of a fluid heating device for heating a fluid by electromagnetic induction heating is to dispose a heating element, which is a conductor, in the fluid and apply a high-frequency current to an external coil provided around the heating element. By applying the voltage, the heating element is induction-heated.

[0003] That is, by applying an alternating current to the external coil, a magnetic flux crossing the heating element is generated. The magnetic flux generates an eddy current in the heating element to generate Joule heat. The fluid is heated by this Joule heat.

[0004] As the heating element used in the conventional induction heating apparatus, a cylindrical heating element, a columnar heating element having a large number of holes penetrating vertically, and the like have been used.

[0005]

The conventional cylindrical heating element has a problem that heat conversion efficiency is poor.

That is, since the heat conversion area between the fluid and the heating element is small, efficient heat conversion cannot be performed.

[0007] Further, there is a problem in that a columnar heating element having a large number of holes penetrating in the vertical direction causes uneven heating.

In other words, a large amount of eddy current is generated in the hole near the peripheral edge of the heating element, and heating can be performed better. However, eddy current is less generated in the vicinity of the center, and heating cannot be performed well.

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a fluid heating device having a heating element which can perform efficient heat conversion and hardly cause uneven heating in view of the above-mentioned problems of the prior art.

[0010]

Means for Solving the Problems In order to solve the above problems, the fluid heating device according to the first aspect has the following configuration.

[0011] One or a plurality of porous foams that are conductors are provided.

An induction heating coil for induction heating the foam is provided.

[0013] A medium frequency oscillator for supplying a current to the induction heating coil is provided.

A fluid passage is provided for passing a fluid heated by the heat generated by the foam.

[0015] The core body forming a closed circuit is arranged such that the center of the foam and the center of the induction heating coil pass through the core.

Further, in the fluid heating device according to the second aspect,
A plurality of foams were laminated with a gap.

Hereinafter, how the above-mentioned solving means works to solve the problem will be described.

In the fluid heating device according to the present invention, a porous foam is used as a heating element. Since the foam is porous, it has a large heat exchange area with the fluid, and in the present invention, because the medium frequency heating is performed, the foam is heated to the center of the foam, so that the heat conversion efficiency is high. .

Further, since the core of the closed circuit is arranged so that the core passes through the center of the foam and the center of the induction heating coil, it is possible to efficiently prevent the magnetic flux from diffusing. The eddy current can be efficiently generated in the foam while being prevented. Therefore, the heat conversion efficiency is high.

Further, since the intermediate-wave heating is used, not only the surface of the heating element is heated but also the center of the heating element as in high-frequency heating, so that uneven heating is unlikely to occur. It becomes.

Further, in the fluid heating device according to the second aspect,
By providing a gap between the foams, it is possible to exert a pressurizing effect on the foam by the fluid, and it is possible to further increase the heat conversion efficiency.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a schematic diagram illustrating the present invention, FIG. 2 is a perspective view of a foam, and FIG. 3 is a schematic diagram illustrating another embodiment.

As shown in FIG. 1, the fluid heating device according to the present invention mainly comprises a foam 1, an induction heating coil 2, a medium frequency oscillator 3, a fluid passage 4, and a core body 5.

Here, the foam 1 is a sponge-shaped metal body through which a fluid can pass, and one or a plurality of foam bodies are provided.

As an example of the foam 1, a columnar member having a hole 1a at the center as shown in FIG. 2 can be considered. Of course, the shape of the foam 1 is not limited to the columnar shape shown in the drawing, but may be any shape as long as heat exchange can be performed efficiently.

The foam 1 may be made of any material as long as it generates eddy current. However, if the foam 1 is made of nickel, titanium, manganese, tungsten, cobalt or the like, the temperature of the foam 1 becomes extremely high, so that heating is not possible. Efficiency is high and running costs can be reduced.

When a plurality of foams 1 are stacked and used, it is preferable to provide a gap between the foams 1.
This is because the fluid exerts a pressurizing effect on the foam.

The induction heating coil 2 is connected to a medium frequency oscillator 3 which outputs a medium frequency signal (400 Hz to 8 Hz).
00HZ).

In FIGS. 1 and 2, the induction heating coil 2 is disposed outside the foam 1, but the position of the induction heating coil 2 is inside the foam 1, above and below the foam 1, and so on. It goes without saying that the position may be any position where an eddy current can be generated.

As an example of the fluid passage 4, as shown in FIG. 1, a fluid introduced from the outside passes through the inside of the foam 1 (the arrow in the figure indicates the direction in which the fluid flows). It is conceivable that it passes through the inside of the container housing 1 and is led out. Passing through the inside of the foam 1
This is for improving the heat conversion efficiency. Of course, it is possible to heat the fluid only by passing through the container housing the foam 1 without passing through the foam 1.

The core body 5 is a rectangular frame as shown in FIG. Of course, the shape is not limited to this shape, and any shape may be used as long as a closed circuit can be formed.

The core 5 has a central portion of the induction heating coil 3 and a central portion of the foam 1 arranged in a shape through which the core 5 passes. Specifically, as shown in FIG.
The induction heating coil 2 is arranged in a shape surrounding the core, and the core is arranged so that one side of the core 1 passes through the center of the foam 1.
Alternatively, as shown in FIG. 3, the induction heating coil 3 is arranged in a shape surrounding one side of the core body 5, and the core body 5 is arranged so that the other side of the core body 5 passes through the center of the foam 1. Configurations are possible.

[0034]

In the fluid heating apparatus according to the present invention, if the foam is made of, for example, nickel, the heat generation temperature of the foam can be reduced to about 800 ° C., and the fluid can be efficiently heated. It becomes possible. For example, when heating water with a nickel foam, it can be heated to 100 ° C. steam at the stage of passing through the first stage foam, and heated to 800 ° C. or higher at the stage of reaching the eighth stage foam. It becomes possible.

As described above, in the fluid heating device according to the present invention,
Since the fluid can be heated to a very high temperature, it is possible to not only heat the fluid but also burn out impurities contained in the fluid. For example, as described above, if a plurality of foams are stacked and a fluid is heated to 950 ° C. or higher, it is possible to burn out harmful substances such as dioxin contained in the fluid, and not only a mere fluid heating effect, An apparatus having a fluid purification effect can also be obtained.

Further, in the fluid heating device according to the second aspect,
By providing a gap between the foams, it is possible to exert a pressurizing effect on the foam by the fluid, and it is possible to further increase the heat conversion efficiency.

[Brief description of the drawings]

FIG. 1 is a configuration diagram schematically illustrating the present invention.

FIG. 2 is a perspective view of a foam.

FIG. 3 is a configuration diagram schematically illustrating another embodiment.

[Explanation of symbols]

 1. Foam 1a. Hole 2. Induction heating coil 3. Medium frequency oscillator 4. Fluid passage 5. Core body

Claims (2)

[Claims] 1. One or a plurality of porous foams 1, which are conductors, are provided; an induction heating coil 2 for induction heating the foams 1 is provided; A medium frequency oscillator 3 for supplying a frequency current; a fluid passage 4 through which a fluid heated by the heat generated by the foam 1 passes.
A fluid heating device, wherein the core body 5 forming a closed circuit is arranged in a shape in which the core body 5 passes through the center of the foam 1 and the center of the induction heating coil 2. 2. The fluid heating device according to claim 1, wherein a plurality of foams 1 are stacked with a gap therebetween.