JPH0735413A - Electromagnetic induction heat exchanger - Google Patents

Abstract

PURPOSE:To transfer heat energy from a metallic body to liquid and/or gas directly without any heat loss to the outside by a method wherein the metallic body, set in a substance to be heated or liquid and/or gas, is heated by electromagnetic induction heating without contacting with the outside of the metallic body. CONSTITUTION:A heat generating body or a metallic body 4 is set in a case 3, around which a coil 2, connected to an A.C. power supply 1, is wound, so as to be submerged into liquid or gas to be heated while an AC current is conducted through the coil 2 to generate heat by the metallic body 4 whereby the liquid or the gas is heated while being contacted directly with the metallic body 4. Accordingly, the liquid or the gas is heated by the transfer of heat. In this case, the heated metallic body is submerged into the liquid or the gas totally whereby heat energy, generated in the metallic body by electric energy, can be transferred to the liquid or the gas totally.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for heating a metal body in liquid or gas by electromagnetic induction heating and heating the liquid or gas by direct heat transfer.

[0002]

2. Description of the Related Art As a heating device, there are boilers, various heat exchangers, various dryers, etc. for industrial use, and various heaters, instant water heaters, bath water heaters, central heating for home use. There is a boiler etc. There are various types of these heat sources, one for oil, one for gas, and one for electricity, but they are roughly divided into those having the following configurations.

(A) An external heat source, for example, a burner or a nichrome wire heater is caused to generate heat to heat a container separating the heat source from a liquid or gas, and the heat is transferred from the heated container to the liquid or the gas. A method of heating gas. According to this method, when the heat source heats the container, heat is radiated to other than the container. Next, the heat transferred to the container that faces the outside in addition to the liquid or gas that is the object to be heated is radiated to the outside in addition to the liquid and the gas. Since the heat radiation to the outside causes a heat loss as it is, in order to prevent it, it is necessary to use a heat insulating material or the like to prevent the heat from moving to the outside.

(B) In recent years, various methods using electromagnetic induction heating as a heat source have been adopted. These heat the container itself by electromagnetic induction heating. However, even in this method, since heat transfer from the heat source to the container is not necessary, heat loss is reduced, but heat transfer similar to the above occurs at the time of heat transfer from the container to liquid or gas.

(C) Some of the ready-made products use a heat source such as an electric heater and the heat source is installed in the liquid by mechanical insulation to suppress heat loss to the outside. In this case, Since this is mechanical insulation, there is a risk that the insulation will break due to corrosion or other factors.

(D) Further, it is known that impurities (scale) are stuck between a liquid or gas and a container.
Since these impurities adhere to the container, heat transfer between the container and the liquid or gas deteriorates, resulting in increased heat transfer to the outside.
Heat loss increases. Conventionally, in order to prevent this kind of heat loss, mechanical removal of impurities. A method of dissolving impurities using chemicals. From the beginning, there has been a method of using pure water or the like to prevent impurities from being mixed in, but it is very laborious and expensive.

(E) There are also means for moving the heat of the heat source directly into the gas, such as a gas heater and a dryer, but the problem is that it is dangerous because the temperature is high immediately after the heat is transferred into the gas, and electricity is used. In that case, it was necessary to take measures to prevent electric shock.

[0008]

DISCLOSURE OF THE INVENTION The present invention converts an electric energy into a heat energy so that the object to be heated can be safely heated without physical heat loss from a heat source and a container as described in the prior art. The point is how to directly transfer heat to a liquid or gas.

[0009]

Means for Solving the Problems In a case in which a coil connected to an AC power source is wound, a metal body serving as a heating element is installed at a position where it is immersed in a liquid or a gas which is an object to be heated.

[0010]

Operation When an alternating current is passed through the coil, the metal body serving as a heating element is heated by electromagnetic induction heating. Liquid and gas can be heated by bringing the liquid and gas into contact with the heated metal body. At this time, since the heated metal body is all immersed in the liquid or gas, all the thermal energy generated in the metal body by the electric energy is transferred to the liquid or gas.

[0011]

EXAMPLE 1 FIG. 1 is a sectional view showing Example 1. In the first embodiment, the AC power source (1) is provided outside the case (3).
A coil (2) connected to the coil is wound, a metal body (4) serving as a heating element is installed inside the case (3), and an alternating current is passed through the coil (2) to heat the metal body (4). (3) The inside liquid and gas are brought into direct contact with the metal body (4) to heat them.

FIG. 2 is a sectional view showing a second embodiment. In the second embodiment, the coil (2) connected to the AC power supply (1) is wound inside the case (3) to form the case (3).
A metal body (4) serving as a heating element is installed outside, an alternating current is passed through the coil (2) to heat the metal body (4), and liquid and gas outside the case (3) are exchanged with the metal body (4). It is heated by directly contacting it.

FIG. 3 is a perspective view showing a third embodiment. In the third embodiment, the metal body (4) serving as a heating element is composed of one metal rod (5).

FIG. 4 is a perspective view showing a fourth embodiment. In the fourth embodiment, the metal body (4) serving as a heating element is composed of a plurality of metal rods (5). It is a known fact that a large heat transfer area is advantageous in heat transfer. By using a plurality of metal rods (5), the surface area, which is a heat transfer area, can be made larger than that of one metal rod (5).

FIG. 5 is a perspective view showing a fifth embodiment. In the fifth embodiment, the metal body (4) serving as the heating element is composed of the metal sphere (6). The number of metal spheres (6) may be one, or a plurality of metal spheres (6) may constitute the metal body (4).

FIG. 6 is a perspective view showing a sixth embodiment. In the sixth embodiment, the metal body (4) serving as a heating element is composed of metal particles (7). By using the metal particles (7), the surface area can be increased, which is advantageous for heat transfer.

FIG. 7 is a perspective view showing a seventh embodiment. In the seventh embodiment, the metal body (4) serving as a heating element is composed of one metal pipe (8). Compared with the metal rod (5) of Example 3 in which the metal body (4) is made hollow, the surface area is increased and a heat transfer area can be obtained more, and liquid and gas can pass through. This will reduce the resistance when doing.

FIG. 8 is a perspective view showing an eighth embodiment. In Example 8, the metal body (4) serving as a heating element is composed of a plurality of metal pipes (8). By doing so, the metal body (4) of Example 7 is replaced with a single metal pipe (8).
It is possible to obtain a larger heat transfer area than that of the above.

FIG. 9 is a perspective view showing a ninth embodiment. In Example 9, the metal body (4) serving as a heating element is composed of a single wire net (9). Due to its structure, the wire mesh (9) in which metal wires are meshed can have a very large surface area relative to the actual volume.

FIG. 10 is a perspective view showing a tenth embodiment. In the metal body (4) composed of the single wire net (9) of Example 9, it is difficult to form the metal body (4) according to the shape of the case (3). Therefore, in the tenth embodiment, the metal body (4) serving as a heating element is composed of a plurality of wire meshes (9).
This makes it easy to mold the case (3) according to its shape.

FIG. 11 is a perspective view showing an eleventh embodiment. It is known that electromagnetic induction heating is easier on the surface than on the wire. From this point of view, the metal body (4) composed of the wire mesh (9) shown in Examples 9 and 10 is disadvantageous. So, in the thing of Example 11, the metal body (4) used as a heat generating body is comprised by one metal plate (10).

FIG. 12 is a perspective view showing a twelfth embodiment. In the metal body (4) composed of the single metal plate (10) of Example 11, it is difficult to form it according to the shape of the case (3). Therefore, in the twelfth embodiment, the metal body (4) serving as a heating element is composed of a plurality of metal plates (10). This makes it easy to mold the case (3) according to its shape.

FIG. 13 is a perspective view showing a metal body of the thirteenth embodiment. In the thirteenth embodiment, the metal body (4) serving as the heating element is the metal plate (1) that has been embossed (11).
0). By doing so, the flow of liquid and gas is disturbed by the unevenness on the metal plate (10) formed by the embossing (11). It is known that turbulence in gas and liquid is advantageous for heat transfer. Needless to say, it is preferable to emboss (11) the surface of a rod-shaped, pipe-shaped, or spherical metal body.

FIG. 14 is a perspective view showing a metal body of the fourteenth embodiment. In the fourteenth embodiment, the metal body (4) serving as a heating element is composed of a metal plate (10) that has been subjected to a plurality of perforations (12). In this way, the flow of liquid or gas is disturbed through the holes, which is advantageous for heat transfer. Needless to say, the surface of the metal body (4) having a rod shape, a pipe shape, a spherical shape, or a net shape may be perforated (12). Further, it is more preferable that the metal body (4) having a rod shape, a pipe shape, a spherical shape, a net shape, or a metal plate shape, which is embossed (11), is perforated (12).

FIG. 15 is a perspective view showing a metal body according to the fifteenth embodiment. In the fifteenth embodiment, the metal body (4) serving as a heating element is composed of the metal plate (10) which is corrugated (13). In this case, the waveform of the metal plate (10) disturbs the flow of liquid and gas, which is advantageous for heat transfer. Needless to say, corrugation (13) may be applied to a rod-shaped, pipe-shaped, spherical, or mesh-shaped metal body (4). It is more preferable to combine the rod-shaped, pipe-shaped, spherical, mesh-shaped, and metal plate-shaped metal bodies (4) with embossing (11), drilling (12), and corrugating (13).

FIG. 16 is a perspective view showing a metal body of the sixteenth embodiment. In the sixteenth embodiment, the metal body (4) serving as a heating element is composed of a plurality of metal plates (10), and the metal plates (10) are welded (14) together. In this way, the respective metal plates (10) become an integral metal body (4) electromagnetically, and it is well known that they are advantageous for heating by electromagnetic induction heating. Needless to say, the welding (14) may be performed on a rod-shaped, pipe-shaped, spherical, or net-shaped metal body (4). Further, it is more preferable to perform welding (14) on a combination of a rod-shaped, pipe-shaped, spherical, mesh-shaped, metal plate-shaped metal body with embossing (11), drilling (12), and corrugating (13).

It should be noted that not only the combination of processing but also the combination of those of the third to sixteenth embodiments may be carried out as the constituent elements of one metal body.

FIG. 17 is a sectional view showing the seventeenth embodiment. In the seventeenth embodiment, in the metal body (4) composed of a plurality of metal plates (10), the metal plates (10) are laminated so as to be perpendicular to the liquid and gas flowing directions (15). It is a thing. The constituent elements of the metal body (4) may be rod-shaped, pipe-shaped or net-shaped, and embossing (11), drilling (12) and corrugation (1
3) and welding (14) may be performed.

FIG. 18 is a sectional view showing an eighteenth embodiment. In the eighteenth embodiment, a metal body (4) composed of a metal plate (10) is laminated such that the metal plates (10) are parallel to the flowing directions (15) of liquid and gas. Is. By doing so, it is possible to reduce the pressure loss when the liquid and the gas pass, as compared with the case where the liquid and the gas are stacked at right angles to the flowing direction (15). The constituent elements of the metal body (4) may be rod-shaped, pipe-shaped, mesh-shaped, or embossed (11),
Drilling (12), corrugation (13), welding (14)
It is also possible to implement.

FIG. 19 is a sectional view showing Embodiment 19. In the nineteenth embodiment, the metal body (4) as in the third to eighteenth embodiments is fixed by the frictional force between the metal body (4) and the case (3).

FIG. 20 is a sectional view showing Embodiment 20. In the twentieth embodiment, the metal body (4) as in the third to eighteenth embodiments is fixed by providing the projection (16) on the case (3).

FIG. 21 is a sectional view showing Embodiment 21. In the twenty-first embodiment, the metal body (4) as in the third to eighteenth embodiments is received by the support (17).

FIG. 22 is a sectional view showing Embodiment 22. In the twenty-second embodiment, the flange (18) receives the metal body (4) as in the third to eighteenth embodiments.

FIG. 23 is a sectional view showing a case of the twenty-third embodiment. In Example 23, a circular case (19) is used as the case (3).

FIG. 24 is a sectional view showing the case of the embodiment 24. In the twenty-fourth embodiment, the elliptical case (20) is used as the case (3).

FIG. 25 is a sectional view showing a case of the twenty-fifth embodiment. In the twenty-fifth embodiment, a polygonal case (21) is used as the case (3).

FIG. 26 is a perspective view showing a twenty-sixth embodiment. In the twenty-sixth embodiment, the coil (2) connected to the AC power supply and attached to the periphery of the case (3) is attached.

FIG. 27 is a sectional view showing Embodiment 27. In the twenty-seventh embodiment, the shield plate (22) for preventing electromagnetic wave leakage is provided outside the case (3) and the coil (2).

FIG. 28 is a sectional view showing Embodiment 28. In Example 28, a shield plate (22) for preventing electromagnetic wave leakage is provided between the case (3) and the coil (2).

FIG. 29 is a sectional view showing Embodiment 29. In Example 29, the coil (2) is embedded in the case (3). Note that this embodiment may be combined with the twenty-seventh and twenty-eighth embodiments.

FIG. 30 is a sectional view showing Embodiment 30. In the thirty-third embodiment, the distributor (2) is provided before and after the metal body (4) so that the liquid and the gas uniformly touch the metal body (4).
3) is provided.

FIG. 31 is a sectional view showing Embodiment 31. In the thirty-first embodiment, a pump or fan (24) is provided to promote the flow of liquid or gas.

[0043]

According to the method of the present invention, by using electromagnetic induction heating, electric energy is converted into heat energy without waste, and the heating element is in liquid or air without touching the outside. There is no reduction in thermal efficiency due to the adhesion of scales, and all the heat energy of the heating element is transferred to liquid or gas. Further, since the total surface area of the metal body is the heat transfer area, by selecting a metal body having a large surface area, the heat transfer area can be made very large and the surface temperature of the metal body can be lowered. Moreover, even if you touch the heating element, there is no risk of electric shock and it is safe. Further, since the same device can be used to heat the object to be heated, either liquid or gas, it is possible to easily heat both liquid and gas with one device.

[Brief description of drawings]

FIG. 1 is a sectional view showing a first embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a second embodiment of the present invention.

FIG. 3 is a perspective view showing a third embodiment of the present invention.

FIG. 4 is a perspective view showing a fourth embodiment of the present invention.

FIG. 5 is a perspective view showing a fifth embodiment of the present invention.

FIG. 6 is a perspective view showing a sixth embodiment of the present invention.

FIG. 7 is a perspective view showing a seventh embodiment of the present invention.

FIG. 8 is a perspective view showing an eighth embodiment of the present invention.

FIG. 9 is a perspective view showing a ninth embodiment of the present invention.

FIG. 10 is a perspective view showing Embodiment 10 of the present invention.

FIG. 11 is a perspective view showing an eleventh embodiment of the present invention.

FIG. 12 is a perspective view showing Embodiment 12 of the present invention.

FIG. 13 is a perspective view showing a metal body of Example 13 of the present invention.

FIG. 14 is a perspective view showing a metal body of Example 14 of the present invention.

FIG. 15 is a perspective view showing a metal body of Example 15 of the present invention.

FIG. 16 is a perspective view showing a metal body of Example 16 of the present invention.

FIG. 17 is a sectional view showing Embodiment 17 of the present invention.

FIG. 18 is a sectional view showing Embodiment 18 of the present invention.

FIG. 19 is a sectional view showing Embodiment 19 of the present invention.

FIG. 20 is a sectional view showing Embodiment 20 of the present invention.

FIG. 21 is a sectional view showing Embodiment 21 of the present invention.

22 is a sectional view showing Embodiment 22 of the present invention. FIG.

FIG. 23 is a cross-sectional view showing the case of Embodiment 23 of the present invention.

FIG. 24 is a sectional view showing a case according to example 24 of the present invention.

FIG. 25 is a cross-sectional view showing a case of Example 25 of the present invention.

FIG. 26 is a perspective view showing Embodiment 26 of the present invention.

FIG. 27 is a sectional view showing Embodiment 27 of the present invention.

FIG. 28 is a sectional view showing Embodiment 28 of the present invention.

FIG. 29 is a sectional view showing Embodiment 29 of the present invention.

FIG. 30 is a sectional view showing Embodiment 30 of the present invention.

FIG. 31 is a sectional view showing Embodiment 31 of the present invention.

[Explanation of symbols]

 1 AC Power Supply 2 Coil 3 Case 4 Metal Body 5 Metal Rod 6 Metal Sphere 7 Metal Grain 8 Metal Pipe 9 Wire Mesh 10 Metal Plate 11 Embossing 12 Drilling 13 Corrugation 14 Welding 15 Liquid / Gas Flowing Direction 16 Protrusion 17 Support 18 Flange 19 Circular case 20 Elliptical case 21 Polygonal case 22 Shield plate 23 Distributor 24 Pump or fan

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[Procedure amendment]

[Submission date] September 28, 1994

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be amended] Claims

[Correction method] Change

[Correction content]

[Claims]

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0008

[Correction method] Added

[Correction content]

[0008]

SUMMARY OF THE INVENTION An object of the present invention is to convert electric energy into heat energy so that the heat source can be safely heated without physical heat loss from the heat source and container as described in the prior art. How to transfer heat directly to body liquid or gas, and when scale is attached
In order to prevent the heat efficiency of the
How to lower the surface temperature by
In point.

[Procedure 3]

[Document name to be amended] Statement

[Correction target item name] 0009

[Correction method] Added

[Correction content]

[0009]

[ MEANS FOR SOLVING THE PROBLEMS] In a case in which a coil connected to an AC power supply is wound, a metal body serving as a heating element is installed at a position where it is immersed in a liquid or gas that is a heated object, and electromagnetic induction is performed.
Direct heating causes a metal body in a liquid or gas to generate heat,
Heat transfer is performed by making contact.

Claims (1)

[Claims] 1. A metal body (4) serving as a heating element is immersed in a heated liquid or gas in a case (3) wound with a coil (2) connected to an AC power source (1). Installed electromagnetic induction heat converter