JP3553627B2 - Electromagnetic induction heat converter - Google Patents

Description

[0001]
[Industrial applications]
The present invention relates to an apparatus for heating a liquid and a gas by direct heat transfer by causing a metal body to generate heat in a liquid and a gas by electromagnetic induction heating.
[0002]
[Prior art]
Examples of the heating device include boilers, various heat exchangers, and various dryers for industrial use, and various types of heaters, instantaneous water heaters, bath water heaters, boilers for central heating, and the like for home use. There are various types of heat sources, such as those for oil, those for gas, and those for electricity, which are broadly divided into those having the following structures.
[0003]
(B) An external heat source, such as a burner or a nichrome wire heater, is heated to heat a container that separates the liquid and gas from the heat source, and heats the liquid and gas by transferring heat from the heated container to the liquid and gas. how to. According to this method, when the heat source heats the container, heat is released to parts other than the container. Next, heat transferred to the container facing the outside in addition to the liquid or gas to be heated is radiated to the outside in addition to the liquid or gas. Since the heat radiation to the outside is directly a heat loss, in order to prevent the heat loss, a device such as a heat insulating material must be used so that the heat does not move to the outside.
[0004]
(B) In recent years, various methods using electromagnetic induction heating as a heat source have been adopted. These generate heat in the container itself by electromagnetic induction heating. However, even in this method, the heat loss is reduced because the heat transfer from the heat source to the container is not necessary, but the same heat loss occurs when transferring the heat from the container to the liquid or gas.
[0005]
(C) Some of the ready-made products use a heat source such as an electric heater and install a heat source in the liquid by mechanical insulation to suppress heat loss to the outside. Since the insulation is very poor, there is a possibility that the insulation may be broken due to corrosion or the like.
[0006]
(D) It is well known that impurities (scale) stick between the liquid or gas and the container. However, since these impurities adhere to the container, heat transfer between the container, the liquid and the gas becomes poor, As a result, heat transfer to the outside increases, and heat loss increases. To prevent this type of conventional heat loss, a method of peeling the mechanical impurities, a method of dissolving the impurities using chemicals, using pure water or the like from the beginning, and a method to avoid contamination of impurities row However, it is very time-consuming and expensive.
[0007]
(E) There are also means to transfer the heat of the heat source directly into the gas, such as gas heaters and dryers. However, it is dangerous because the temperature is high immediately after the heat is transferred into the gas. Measures were needed to avoid this.
[0008]
[Problems to be solved by the invention]
It is an object of the present invention to convert electric energy into heat energy and directly heat liquids and gases to be heated without any physical heat loss from a heat source and a container as described in the related art. The point is how to move. Further, there is a point of preventing a decrease in thermal efficiency at the time of scale adhesion, and a point of how to increase the heat transfer area of the metal body to lower the surface temperature.
[0009]
[Means for Solving the Problems]
In a case where a coil connected to an AC power supply is wound, a metal body to be a heating element is placed at a position soaked in the liquid or gas to be heated, and the metal body in the liquid or gas is heated by electromagnetic induction heating. Is heated, and is brought into direct contact with heat transfer. A coil (2) connected to an AC power supply (1) is wound around the outside of the case (3), and a metal body (4) serving as a heating element is installed inside the case (3). 4) is either formed by constituted by bundling multiple metal pipe (8), metallic plate (10) or wire mesh (9) is wound, ing which are stacked in a spiral shape.
[0010]
[Action]
When an alternating current is passed through the coil, the metal body serving as a heating element is heated by electromagnetic induction heating. A liquid and a gas are brought into contact with the heated metal body, and the liquid and the gas can be heated by heat transfer. At this time, all the heated metal bodies are in a state of being immersed in the liquid or gas, so that all the heat energy generated in the metal bodies by the electric energy is transferred to the liquid or gas.
[0011]
【Example】
FIG. 1 is a cross-sectional view showing an arrangement relationship of a coil, a case, and a heating element according to an embodiment of the present invention. In FIG. 1, a coil (2) connected to an AC power supply (1) is wound around a case (3), and a metal body (4) serving as a heating element is installed inside the case (3). An alternating current is passed through 2) to heat the metal body (4), and the liquid and gas inside the case (3) are brought into direct contact with the metal body (4) for heating.
[0012]
FIG. 2 is a cross-sectional view showing another arrangement relationship between the coil, the case, and the heating element for reference. In FIG. 2, a coil (2) connected to an AC power supply (1) is wound inside a case (3), and a metal body (4) serving as a heating element is installed outside the case (3). An alternating current is applied to 2) to heat the metal body (4), and a liquid or gas outside the case (3) is brought into direct contact with the metal body (4) for heating.
[0013]
FIG. 3 is a perspective view showing a heating element of the reference example . In FIG. 3, the metal body (4) serving as a heating element is constituted by a single metal rod (5).
[0014]
FIG. 4 is a perspective view showing a heating element of another reference example . In FIG. 4, the metal body (4) serving as a heating element is composed of a plurality of metal rods (5). It is a known fact that in heat transfer, a larger heat transfer area is advantageous. By using a plurality of metal rods (5), the surface area, which is the heat transfer area, can be made larger than that of one metal rod (5).
[0015]
FIG. 5 is a perspective view showing a heating element according to still another reference example . In FIG. 5, a metal body (4) serving as a heating element is constituted by a metal ball (6). The number of the metal spheres (6) may be one, or a plurality of the metal spheres (4) may be constituted.
[0016]
FIG. 6 is a perspective view showing a heating element of still another reference example. In FIG. 6, 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.
[0017]
FIG. 7 is a perspective view showing a heating element of still another reference example . In FIG. 7, the metal body (4) serving as a heating element is constituted by a single metal pipe (8). As compared with the metal rod (5) of the third embodiment in which the metal body (4) is formed as a metal body (4), the surface inside is increased, a heat transfer area can be obtained more, and a liquid and a gas can pass through. The resistance at the time of the operation is reduced.
[0018]
Figure 8 is a perspective view showing the heating element of the actual Example 1. In FIG. 8, the metal body (4) serving as a heating element is composed of a plurality of metal pipes (8). In this case, a larger heat transfer area can be obtained than in the case where the metal body (4) of the seventh embodiment is constituted by one metal pipe (8).
[0019]
FIG. 9 is a perspective view illustrating a heating element according to the second embodiment. In FIG. 9, the metal body (4) serving as a heating element is formed of a single wire net (9). The wire mesh (9) in which metal wires are woven together can have a very large surface area with respect to the actual volume due to its structure.
[0020]
FIG. 10 is a perspective view showing a heating element of the reference example. In the case of the metal body (4) composed of a single wire mesh (9) in FIG. 9, it is difficult to form the metal body (4) according to the shape of the case (3). Therefore, in the reference example, the metal body (4) serving as a heating element is constituted by a plurality of wire nets (9). In this case, molding according to the shape of the case (3) is easy.
[0021]
FIG. 11 is a perspective view illustrating the heating element according to the third embodiment. It is well known that electromagnetic induction heating is easier to heat on a surface than on a wire. From this point, the metal body (4) composed of the wire mesh (9) shown in FIGS. 9 and 10 is disadvantageous. Then, in the thing of FIG. 11, the metal body (4) used as a heating element is comprised by one metal plate (10).
[0022]
FIG. 12 is a perspective view showing a heating element of the reference example. It is difficult to form the metal body (4) composed of the single metal plate (10) in FIG. 11 according to the shape of the case (3). Then, in the thing of FIG. 12, the metal body (4) used as a heating element is comprised by a several metal plate (10). In this way, molding according to the shape of the case (3) is easy.
[0023]
FIG. 13 is a perspective view showing an example of processing a metal body that can be applied. In FIG. 13, the metal body (4) serving as a heating element is formed of a metal plate (10) on which embossing (11) has been performed. In this case, the flow of the liquid or gas is disturbed by the unevenness on the metal plate (10) formed by the embossing (11). Pneumatic fluid, when the liquid body turbulence occurs, Preference is given to the heat transfer are known. Needless to say, embossing (11) may be applied to the surface of a rod-shaped, pipe-shaped or spherical metal body.
[0024]
FIG. 14 is a perspective view showing an example of processing of an applicable metal body. In FIG. 14, the metal body (4) serving as a heating element is formed of a metal plate (10) on which a plurality of perforations (12) have been made. This is advantageous for heat transfer because the flow of liquid and gas is disturbed through the holes. Needless to say, it is preferable to form a hole (12) on the surface of a rod-shaped, pipe-shaped, spherical, or net-shaped metal body (4). Further, it is more preferable to form a hole (12) on a metal body (4) having a rod shape, a pipe shape, a spherical shape, a net shape, or a metal plate shape that has been embossed (11).
[0025]
FIG. 15 is a perspective view showing an example of processing of an applicable metal body. In FIG. 15, the metal body (4) serving as a heating element is formed of a metal plate (10) subjected to corrugation (13). In this case, the flow of the liquid or gas is disturbed by the waveform of the metal plate (10), which is advantageous for heat transfer. Needless to say, the corrugated processing (13) may be applied to a rod-shaped, pipe-shaped, spherical, or net-shaped metal body (4). It is more preferable to combine a metal body (4) in the shape of a rod, pipe, sphere, net, or metal plate with embossing (11), drilling (12), and corrugation (13).
[0026]
FIG. 16 is a perspective view showing an example of processing a metal body that can be applied. In FIG. 16, a 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). In this way, each metal plate (10) becomes an integral metal body (4) when viewed electromagnetically, and it is known that it is advantageous for heating by electromagnetic induction heating. Needless to say, welding (14) may be performed even 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 embossing (11), drilling (12), and corrugation (13) on a rod-shaped, pipe-shaped, spherical, net-shaped, or metal plate-shaped metal body.
[0027]
It should be noted that not only a combination of processing but also a combination of Embodiments 1 to 3 may be implemented as a component of one metal body.
[0028]
FIG. 17 is a cross-sectional view illustrating an arrangement example of a metal body according to a reference example . In FIG. 17, in a metal body (4) composed of a plurality of metal plates (10), the metal plates (10) are stacked so as to be perpendicular to the direction (15) in which the liquid or gas flows. Things. The components of the metal body (4) may be rod-shaped, pipe-shaped, or net-shaped, and may be embossed (11), drilled (12), corrugated (13), and welded (14). It may be done.
[0029]
FIG. 18 is a cross-sectional view illustrating an example of the arrangement of the metal bodies of Examples 1, 2 , and 3 . In FIG. 18, the metal plate (10) is laminated on a metal body (4) composed of the metal plate (10) so as to be parallel to the direction (15) of the flow of the liquid or gas. is there. In this way, it is possible to reduce the pressure loss when the liquid and the gas pass through, as compared with the one laminated at a right angle to the direction of the flow of the liquid and the gas (15). The components of the metal body (4) may be rod-shaped, pipe-shaped, or net-shaped, and may be embossed (11), drilled (12), corrugated (13), and welded (14). It may be done.
[0030]
FIG. 19 is a cross-sectional view illustrating an example of fixing the metal bodies of Examples 1, 2 , and 3 . 19, the metal body (4) as shown in FIGS. 3 to 18 is fixed by the frictional force between the metal body (4) and the case (3).
[0031]
FIG. 20 is a cross-sectional view illustrating an example of fixing the metal bodies of Examples 1, 2 , and 3 . In the case of FIG. 20, a metal body (4) as shown in FIGS. 3 to 18 is fixed by providing a projection (16) on a case (3).
[0032]
FIG. 21 is a cross-sectional view illustrating an example of fixing the metal bodies of Examples 1, 2 , and 3 . In FIG. 21, the metal body (4) as shown in FIGS. 3 to 18 is received by the support (17).
[0033]
FIG. 22 is a cross-sectional view illustrating an example of fixing the metal bodies of Examples 1, 2 , and 3 . 22, the metal body (4) as shown in FIGS. 3 to 18 is received by the flange (18).
[0034]
FIG. 23 is a sectional view showing the case. In FIG. 23, a circular case (19) is used as the case (3).
[0035]
FIG. 24 is a sectional view showing the case. In FIG. 24, an elliptical case (20) is used as the case (3).
[0036]
FIG. 25 is a sectional view showing the case. In FIG. 25, a polygonal case (21) is used as the case (3).
[0037]
FIG. 26 is a perspective view showing another arrangement example of the coil with respect to the case. In FIG. 26, a coil (2) connected to an AC power supply and wound around the case (3) is attached.
[0038]
FIG. 27 is a sectional view of a case and a coil portion. In FIG. 27, a shield plate (22) for preventing leakage of electromagnetic waves is provided outside the case (3) and the coil (2).
[0039]
FIG. 28 is another sectional view of the case and the coil portion. 28, a shield plate (22) for preventing leakage of electromagnetic waves is provided between the case (3) and the coil (2).
[0040]
FIG. 29 is still another cross-sectional view of the case and the coil portion. In FIG. 29, the coil (2) is embedded in the case (3). 27 and 28 may be combined with those in FIG.
[0041]
FIG. 30 is a cross-sectional view of the case and the heating element. In FIG. 30, a distributor (23) is provided before and after the metal body (4) so that the liquid and gas uniformly touch the metal body (4).
[0042]
FIG. 31 is a cross-sectional view of another part of the case and the heating element. In FIG. 31, a pump or a fan (24) is provided to promote the flow of liquid and gas.
[0043]
【The invention's effect】
In the present invention, by using electromagnetic induction heating, electric energy is converted to heat energy without waste, and since the heating element is in liquid or air without touching the outside, the heat efficiency is reduced due to the adhesion of scale. All the heat energy of the heating element is transferred to liquid and gas. Further, since the entire 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 the heating element is touched, there is no fear of electric shock and it is safe. In addition, since the object to be heated can be heated by a similar device regardless of whether the object is a liquid or a gas, heating of both the liquid and the gas can be easily realized by one device.
[Brief description of the drawings]
FIG. 1 is a sectional view showing an arrangement relationship of a coil, a case, and a heating element according to an embodiment of the present invention.
FIG. 2 is a cross-sectional view showing another arrangement relationship of a coil, a case, and a heating element for reference.
FIG. 3 is a perspective view showing a heating element of a reference example .
FIG. 4 is a perspective view showing a heating element of another reference example .
FIG. 5 is a perspective view showing a heating element of still another reference example .
FIG. 6 is a perspective view showing a heating element of still another reference example.
FIG. 7 is a perspective view showing still another heating element.
FIG. 8 is a perspective view showing a heating element according to the first embodiment .
FIG. 9 is a perspective view illustrating a heating element according to a second embodiment .
FIG. 10 is a perspective view showing a heating element of a reference example.
FIG. 11 is a perspective view illustrating a heating element according to a third embodiment .
FIG. 12 is a perspective view showing a heating element of a reference example.
FIG. 13 is a perspective view showing an example of processing a metal body that can be applied.
FIG. 14 is a perspective view showing an example of processing a metal body that can be applied.
FIG. 15 is a perspective view showing an example of processing a metal body that can be applied.
FIG. 16 is a perspective view showing an example of processing of an applicable metal body.
FIG. 17 is a cross-sectional view illustrating an arrangement example of a metal body according to a reference example .
FIG. 18 is a cross-sectional view showing an example of the arrangement of the metal bodies of Examples 1, 2 , and 3 .
FIG. 19 is a cross-sectional view showing an example of fixing the metal body of Examples 1, 2 , and 3 .
FIG. 20 is a cross-sectional view illustrating an example of fixing the metal body of Examples 1, 2 , and 3 .
FIG. 21 is a cross-sectional view illustrating an example of fixing the metal body of Examples 1, 2 , and 3 .
FIG. 22 is a cross-sectional view illustrating an example of fixing a metal body of Examples 1, 2 , and 3 .
FIG. 23 is a sectional view showing a case.
FIG. 24 is a sectional view showing a case.
FIG. 25 is a sectional view showing a case.
FIG. 26 is a perspective view showing another arrangement example of the coil with respect to the case.
FIG. 27 is a sectional view of a case and a coil part.
FIG. 28 is another sectional view of a case and a coil portion.
FIG. 29 is still another cross-sectional view of a case and a coil portion.
FIG. 30 is a sectional view of a case and a heating element.
FIG. 31 is a sectional view of another part of the case and the heating element.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 AC power supply 2 Coil 3 Case 4 Metal body 5 Metal rod 6 Metal ball 7 Metal grain 8 Metal pipe 9 Wire mesh 10 Metal plate 11 Embossing 12 Drilling 13 Corrugation 14 Welding 15 Liquid and gas flow direction 16 Projection 17 Support 18 Flange 19 Circular case 20 Oval case 21 Polygonal case 22 Shield plate 23 Distributor 24 Pump or fan

Claims (3)

A metal body (4) serving as a heating element is placed in a case (3) wound with a coil (2) connected to an AC power supply (1) so as to be immersed in a liquid or a gas to be heated. 2) An electromagnetic induction heat converter for heating the metal body (4) by applying an alternating current to the metal body (4) to generate heat and bringing a liquid or gas into direct contact with the metal body (4);
A coil (2) connected to an AC power supply (1) is wound around the outside of the case (3), and a metal body (4) serving as a heating element is installed inside the case (3).
Metal body comprising a heat generating element (4) is an electromagnetic induction heat converter composed configured by bundling multiple metal pipe (8). A metal body (4) serving as a heating element is placed in a case (3) wound with a coil (2) connected to an AC power supply (1) so as to be immersed in a liquid or a gas to be heated. 2) An electromagnetic induction heat converter for heating the metal body (4) by applying an alternating current to the metal body (4) to generate heat and bringing a liquid or gas into direct contact with the metal body (4);
A coil (2) connected to an AC power supply (1) is wound around the outside of the case (3), and a metal body (4) serving as a heating element is installed inside the case (3).
An electromagnetic induction heat converter in which a metal body ( 4 ) serving as a heating element is formed by winding a single metal plate (10) and laminating in a spiral shape . A metal body (4) serving as a heating element is placed in a case (3) wound with a coil (2) connected to an AC power supply (1) so as to be immersed in a liquid or a gas to be heated. 2) An electromagnetic induction heat converter for heating the metal body (4) by applying an alternating current to the metal body (4) to generate heat and bringing a liquid or gas into direct contact with the metal body (4);
A coil (2) connected to an AC power supply (1) is wound around the outside of the case (3), and a metal body (4) serving as a heating element is installed inside the case (3).
An electromagnetic induction heat converter in which a metal body (4) serving as a heating element is formed by winding one wire net (9) and stacking spirally.

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