JPH0894176A - Liquid heating device utilizing electromagnetic induction heating - Google Patents

Abstract

PURPOSE: To increase heat transforming efficiency and improve the utility of a liquid heating device utilizing safe and clean electromagnetic induction heating. CONSTITUTION: A liquid heating device is provided with at least a flux generating coil 1, a high-frequency oscillator, supplying high-frequency current to the coil 1, a main heat exchanging unit 3, formed of a material generating heat by receiving flux, and an auxiliary heat exchanging unit 4, formed of a material generating heat by receiving the flux also. The main heat exchanging unit 3 is equipped with a passage 30 therein to pass liquid to be heated and is arranged at the inside A of the coil 1. The auxiliary heat exchanging unit 4 is equipped with a passage 40 for passing liquid to be heated therein and is arranged at the outside B of the coil 1. The main heat exchanging unit 3 is heated by the electromagnetic induction of the coil 1 and heats the liquid passing through the inside of itself while the auxiliary heat exchanging unit 4 is heated by the electromagnetic induction of the coil 1 and heats the liquid passing through the inside of the unit.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid heating device utilizing electromagnetic induction heating.

[0002]

2. Description of the Related Art Gas instantaneous water heaters are widely used as instantaneous water heaters, but attention must be paid to ignition, carbon monoxide poisoning, explosive flames, fires, burns, gas leakage and exhaust gas ventilation. Since it is necessary, a water heater using electromagnetic induction heating that does not have such a concern is drawing attention.

The principle of this electromagnetic induction heating will be explained. For example, when induction hardening is performed on the surface of a pipe b as shown in FIG. 12, a spirally wound conductor wire or coil a is used.
Place this pipe b in the center of (inside A) of
And a high-frequency oscillator (not shown) are short-circuited to generate a magnetic flux Φ from the coil a and generate a heating current in the pipe b itself to heat the pipe b.

Therefore, when the principle of such electromagnetic induction heating is applied to an instantaneous water heater, as in the induction hardening of the pipe b, the water guiding pipe c is provided inside the coil a, The water d is passed through the water guiding pipe c, and the water guiding pipe c is subjected to induction heating to indirectly heat the water d (FIG. 13).

However, the water heater having such a principle has a very poor efficiency of conversion of electric energy into heat energy (hereinafter referred to as heat conversion efficiency) of about 40%. This is mainly due to the generation of a magnetic flux φ as shown in FIG. 14 (which expands in the air outside the coil due to the repulsive force of each other), and such magnetic loss, transmission line loss, and internal oscillator The electrical loss and the coil loss of the above lead to the above-mentioned decrease of the heat conversion efficiency (in FIG. 14, the water conduit c is omitted in order to avoid complication of the drawing).

Therefore, not only the water heater but also the device using the technique of induction heating can reduce the leakage magnetic flux (ineffective magnetic flux, air attenuation) as much as possible, and increase the coil efficiency. is there. As shown in FIG.
A magnetic path is formed by arranging an iron core e made of a silicon steel plate at an appropriate position on the outer side B of the coil a, that is, a magnetic flux is passed into the iron core e to eliminate a decrease in magnetic force. It was general to improve the heat conversion efficiency.

However, even if the expensive iron core e of silicon steel plate is provided in this way, the heat conversion efficiency of the water heater should be 50 to 60% (conditionally. Some are easier to achieve, but this is generally the case). This is because loss such as heat generation occurs in the iron core e. Even so, as for the instantaneous water heater using induction heating, the one with such a numerical value is the one with substantially the best performance at present.

[0008]

SUMMARY OF THE INVENTION It is an object of the present invention to improve the heat conversion efficiency of a liquid heating device such as a water heater, which utilizes safe and clean electromagnetic induction heating, to improve its practicality. It is intended.

[0009]

A liquid heating apparatus utilizing electromagnetic induction heating according to a first aspect of the present invention includes at least one magnetic flux generating coil 1 and a high frequency oscillator 2 for supplying a high frequency current to the coil 1. And a main heat exchange section 3 made of a material that receives heat from the magnetic flux to generate heat, and a sub heat exchange section 4 also made of a material that also receives heat from the magnetic flux to generate heat. The main heat exchange section 3 is provided inside the coil 1 with a passage 30 for passing the liquid to be heated. The sub heat exchange section 4 is provided on the outside B of the coil 1 with a passage 40 for passing a liquid to be heated. The main heat exchange section 3 generates heat by electromagnetic induction of the coil 1 and heats the liquid passing through the passage 30, and the sub heat exchange section 4 also generates heat by electromagnetic induction of the coil 1 and passes through the passage 40. It heats the liquid.

A liquid heating apparatus utilizing electromagnetic induction heating according to the second aspect of the present invention is the apparatus according to the first aspect of the present invention, further having the following configuration. That is, the coil 1 is formed by arranging a long conductor 11 in a spiral shape, and further, the conductor 11 is a tubular body which forms a passage 13 through which a liquid passes, It is characterized in that the liquid passing through the passage 13 is heated by the resistance heat generation of the conductor 11 when energized.

A liquid heating apparatus utilizing electromagnetic induction heating according to a third invention of the present application is the apparatus according to the first or second invention, wherein the main heat exchange section 3 is formed as a substantially columnar body. Is provided inside the coil 1, and collar-shaped portions 6 and 6 are provided near both ends of the coil 1. The collar-shaped portions 6 and 6 are located near both ends of the coil 1 and are adjacent to the main heat exchange portion. 3 projecting outward in the radial direction.

A liquid heating apparatus utilizing electromagnetic induction heating according to a fourth aspect of the present invention is the liquid heating apparatus according to the first, second or third aspect of the present invention, wherein the heat exchange section 2 is provided inside the high frequency oscillator 2.
a is formed, and a proper passage 20 for passing the liquid to be heated is also provided in the heat exchange portion 2a.

[0013]

In the liquid heating apparatus utilizing electromagnetic induction heating according to the first aspect of the present invention, the auxiliary heat exchange section 4 is disposed on the outer side B of the coil 1 for magnetic flux generation, which causes a large energy loss in the related art. The magnetic flux generated on the outside of the coil 1 that has been used also enables heat exchange. As a result, the heat exchange rate was 90% or more, which was a marked improvement over the conventional one.

A liquid heating apparatus utilizing electromagnetic induction heating according to the second invention of the present application not only exhibits the operation of the apparatus according to the first invention, but also allows the heat exchange liquid to pass through the coil 1 itself. Therefore, the heat generated by the coil 1 itself when energized can be used for heating the liquid, and the heat conversion efficiency is further improved.

A liquid heating apparatus utilizing electromagnetic induction heating according to a third aspect of the present invention has the function of the apparatus according to the first or second aspect of the present invention, and has a main heat exchange section 3 in the coil 1 inside A. By arranging the iron-made collar-shaped portions 6 and 6 at the position where the magnetic flux passes between the outside B and the auxiliary heat exchange portion 4, a magnetic path is formed in the collar-shaped portions 6 and 6. , The significant decay of magnetism that occurs in the air has been eliminated. That is, by forming the magnetic paths in the collar-shaped portions 6 and 6 by using the iron-shaped collars 6 and 6, the spontaneous magnetism of iron does not cause significant attenuation of the magnetism that occurs in the air. Of.
The flange-shaped portions 6 and 6 form a magnetic path from the sub heat exchange portion 4 to the main heat exchange portion 3 to prevent magnetic loss. In addition to this, since heating of liquid such as water is prioritized, unnecessary portions other than this are not heated.

A liquid heating apparatus using electromagnetic induction heating according to the fourth invention of the present application has the function of the apparatus according to the first, second, or third invention, and has an electric resistance inside the high-frequency oscillator 2. Regarding heat generation due to electrical loss due to
The heat can be converted, and the heat conversion efficiency can be improved.

[0017]

EXAMPLES An example of the present invention will be specifically described below.

This apparatus comprises at least one coil 1 for generating a magnetic flux, a high frequency oscillator 2 for supplying a high frequency current to the coil 1, a main heat exchange section 3 formed of a material for receiving and heating a magnetic flux. Similarly, the auxiliary heat exchange part 4 formed of a material that receives and heats magnetic flux is provided. 1, FIG. 2, FIG. 3 and FIG. 7, first, an embodiment of the configuration of the peripheral edge of the heat exchange section will be given (the high frequency oscillator 2 is omitted in these figures).

The coil 1 is connected to a high frequency oscillator 2,
An alternating current is received from the high frequency oscillator 2 to generate a magnetic flux. The coil 1 may be formed simply as a conductive wire, but in order to provide the heat of the coil itself for heating the liquid, a hollow tubular body (copper tube) formed of a conductor such as copper or copper alloy is also used. It is effective to adopt a spirally shaped resin, and to let a liquid such as water to be heated pass inside. In this case, the heating of the coil 1 itself can be suppressed. When the coil 1 is formed as a copper tube as described above, it is suitable to use an insulating coating made of a material such as Nomex paper. Of course, it is also possible to use another material instead of Nomex paper as long as it can provide insulation and thermal conductivity. In this embodiment, the coil 1 has an outer diameter of about 10 mm and a thickness of about 1 mm, but the invention is not limited to such numerical values and can be changed as appropriate. In the embodiment shown in FIG. 7, the copper tube forming the coil 1 is shown to be double, but the coil 1 can be implemented even if it is triple or more. There may be only one, not a plurality of overlapping ones. The coil 1 may be a copper tube, but it is more effective in terms of thermal conductivity if it is formed of stainless steel.

The main heat exchange section 3 is disposed inside the coil 1 and receives a magnetic flux from the coil 1 to generate a heating current and generate heat. The sub heat exchange section 4 is disposed outside the coil 1 and receives a magnetic flux generated from the coil 1 to generate a heating current to generate heat. Both heat exchange parts 3, 4
As the material capable of electromagnetic induction heating to form the above, a metallic material is suitable regardless of whether it is iron or non-ferrous, but in practical use, particularly, aluminum, aluminum alloy, SUS material and other metals such as iron are suitable. There is. However, besides this,
If there is a material capable of electromagnetic induction heating within a practical range, it is possible to use such a material instead of the above material. Hereinafter, the main heat exchange section 3 and the sub heat exchange section 4 will be described in detail in order.

The main heat exchange section 3 is provided with a passage 30 through which a liquid to be heated is passed. In this example,
The main heat exchange section 3 is formed as a columnar body that can be housed inside the coil 1 and the passage 30 is formed inside the columnar body 31. However, the present invention is not limited to such an embodiment, and the passage 3
It is also possible to implement it by forming the tubular body 30a having 0 inside by forming it in a spiral shape or the like (FIG. 4). When forming as a cylindrical body as described above,
It is suitable to be formed by casting or the like, but in this case, it is also possible to adopt a form other than a spiral so that casting can be easily performed. For example, the tubular body 30a shown in FIG. 5 may be arranged in a ninety-nine folded shape. Furthermore, it is possible to implement the arrangement of the passages 30 other than this. The arrangement other than the spiral shape, including the embodiment shown in FIG. 5, is not limited to the tubular body 30a, and can be similarly applied to the one in which the passage 30 is formed inside the heat exchange portion formed as a columnar body. (In this case, the embodiment of FIG. 5 is as shown in FIG. 6). Particularly, in the case of molding by casting, it is advantageous to adopt the arrangement of the passages 30 shown in FIG. 5 in terms of ease of molding.

In the embodiment shown in FIG. 7, a main pipe 31 is passed through the center of the main heat exchange portion 3 formed as a columnar body, and a passage 30 is formed in a spiral shape on the outside thereof. There is. The main pipe 31 also allows the liquid to be heated to pass through inside the passage 30 or as a part of the passage 30, and receives the heat generated by the main heat exchange section 3 to heat the liquid. The main pipe 31 is preferably made of SUS, but can be formed by using other materials. In this embodiment, the main pipe 31 has an inner diameter larger than that of the passage 30, and in this embodiment, about 15
It has an inner diameter of around mm. However, it is not limited to such a numerical value, and can be changed as appropriate. When the outer diameter of the main heat exchange section 3 is large, the main pipe 31 has the passage 3
This is particularly effective in such a case, because the diameter of the spiral formed by is large and it becomes difficult to perform heat exchange in the center of the main heat exchange section 3.

In this embodiment, the main heat exchange section 3 is made of aluminum, which is easy to form, and has an external steel pipe 32.
Is fitted. Main heat exchange part 3 made of aluminum
Both the main body and the iron pipe 32 outside the main body receive magnetic flux to generate heat. The iron pipe 32 is arranged for the purpose of forming a better magnetic path inside the coil 1. If it is unnecessary, the iron pipe 32 may not be provided and only the aluminum part 33 may be formed (on the contrary, only iron is used for the main heat exchange part 3).
May be formed, but it is necessary to impart corrosion resistance in order to come into contact with a liquid, and since it becomes heavy, it is not practical for normal use). The iron pipe 32 is made of SS material in this embodiment, and has an outer diameter of about 40 mm and about 3.
It has a thickness of 5 mm. However, these values can be appropriately changed according to changes in the dimensions of the main heat exchange section 3.

The outside of the iron pipe 32 is appropriately covered with a heat insulating material 34 such as paper. If it is unnecessary, the heat insulating material 34 may be omitted.

Further, at the both ends of the main heat exchanging portion 3, brim portions 6 made of iron are arranged. In the embodiment shown in FIG. 7 equipped with the iron pipe 32, the brim portions 6 are formed integrally with the iron pipe 32. However, unlike the above, the iron pipe 3
The 2 and the collar-shaped portions 6 and 6 may be formed separately. For example, the collar-shaped portions 6 and 6 may be formed as separate disks and arranged at both ends of the main heat exchange portion 3. In this case, it is suitable to fit the main heat exchange section 3 as an annular body (a disk having a hole in the center) separate from the main heat exchange section 3. Considering the convenience of mounting the coil 1, only one flange-shaped portion 6 is formed integrally with the iron pipe 32,
The other brim-shaped portion 6 may be detachably formed as a separate body from the iron pipe 32. The outer diameters of the collar portions 6 and 6 are substantially the same as the inner diameter of the sub heat exchange portion 4. Such iron-shaped brim-shaped portions 6 and 6 form a magnetic path inside themselves, and spontaneous magnetism is generated due to the characteristics of iron, which is a magnetic material, and significant attenuation such as magnetic flux in the air occurs. Does not happen. Further, for example, when the collar-shaped portions 6 and 6 are formed of copper or aluminum, large magnetic attenuation occurs even if it is not in the middle of air. Therefore, by being formed of a material such as iron as described above, the attenuation of magnetism due to spontaneous magnetism (spontaneous magnetization) can be suppressed. Further, by arranging the collar-shaped portions 6 and 6 to form a magnetic path, the iron pipe 32 and the collar-shaped portions 6 and 6 are formed.
6 and the sub heat exchange section 4 form a closed magnetic path, and the magnetic flux outside the coil naturally passes selectively through the magnetic field (as a result, it is forced). ). In this way, the magnetic force is confined (closed magnetic path) between the peripheral edges of the collar-shaped portions 6 and 6, and as a result, the auxiliary heat exchange portion 4 is formed.
Can be securely contained in the position where In the embodiment shown in FIG. 7, an iron pipe 32 covering the outer periphery of the main heat exchange section 3
The space surrounded by the collar-shaped portions 6 and 6 on both sides of the side wall and the inner peripheral surface of the auxiliary heat exchange portion 4 accommodates the coil 1 as the coil chamber 10 (see FIGS. 2 and 3). Further, as shown in FIGS. 1, 2 and 3, it is also possible to mount the lids 5 and 5 on both ends of the auxiliary heat exchange part 4, and in this case, the lids 5 and 5 can be fitted.
The collar-shaped portions 6 and 6 are located along the surfaces 5a and 5a. The lids 5 and 5 are made of the same material as the main heat exchange section 3, that is, a material such as aluminum.
As shown in FIG. 2, from the collar portion 6 to the end portion 3 of the main heat exchange portion 3.
5 so as to project (when the collar-shaped portion 6 is formed separately from the iron pipe 32, the end portion 3 is formed at the center of the collar-shaped portion 6.
It is appropriate to provide a through-hole for passing through 5. ), On the other hand, a recess 50 is provided in the center of the surface 5a of the lid 5 which faces the flange 6 side, and the end 35 of the main heat exchange section 3 is inserted into the recess 50.
It is also effective to be able to fit. Reference numeral 51 denotes a groove into which the end portion of the sub heat exchange portion 4 is fitted. A fastener that penetrates the center of the lid body 5 from the outer surface of the lid bodies 5 and 5 in a state where the lid bodies 5 and 5 are fitted and the recess 50 and the end portion 35 of the main heat exchange portion 3 are fitted to each other. 52 is screwed with the screwing portion 36 provided at the center of the end portion 35 of the main heat exchange portion 3. The screwing portion 36 is a hole having an internal thread formed on the inner peripheral surface thereof, and is screwed with a male screw provided near the tip of the fastener 52. Main pipe 3 shown in FIG.
When 1 is provided, a passage for passing the liquid connected to the main pipe 31 may be formed in the center of the fastener 52 (not shown).
In this case, as shown in FIG. 1, the connector 52 is provided with a connecting portion 52a which communicates with another to form a liquid passage. or,
In order to securely fix the lids 5 and 5, as shown in FIG. 1, an appropriate number of intervening rods 53 ... Are passed between the lids 5 and 5, and the screws 54 are screwed together to form the lids 5 and 5. It is also effective to make the intervening rod 53 ...

The sub heat exchange section 4 is a cylindrical body having a sufficient inner diameter capable of accommodating the coil 1 therein. That is, as shown in FIG. 2 and FIG. 7, the auxiliary heat exchange section 4 includes the coil 1
Is disposed on the outer side B of the. A passage 40, through which the liquid passes, is formed in the thick-walled interior 41 of the sub heat exchange section 4, like the main heat exchange section 3. When the passage is formed by a pipe, if an SUS pipe is used, the outer diameter is about 10 mm and about 0.2 mm.
Those having a certain thickness are suitable. However, the material is not limited to such a material, and the dimensional values can be changed as appropriate. In this embodiment, the sub heat exchange section 4 is shown as a tubular body capable of accommodating the coil 1 therein, and the passage 40 is formed in the thick interior 41 thereof as described above. However, the present invention is not limited to such an embodiment, and may be implemented by forming a tubular body into a spiral shape or the like like the main heat exchange section 3 described above. This is similar to the embodiment of the main heat exchange section 3 shown in FIG. 4 (not shown). When it is formed as a cylindrical body as described above, it is suitable to be formed by casting or the like as in the case of the main heat exchange section 3. However, in this case as well, a shape other than spiral is used so that casting can be performed easily. It is possible to implement even if it adopts. For example, similar to the embodiment of the main heat exchange section 3 shown in FIG. 5, the main heat exchange section 3 can be arranged in a zigzag shape and implemented. Furthermore, the present invention can be implemented even if the arrangement of the passage 40 other than this is adopted. In terms of mass production, not only the above casting,
Any means such as mechanical processing, can forming or press molding, molding with a bender, etc. can be adopted. A manufacturing method advantageous in terms of cost and the like may be appropriately selected and implemented.

In this embodiment, the sub heat exchange section 4 has a main body (thickness section) made of aluminum and an outer diameter of about 13 mm.
It has a width of 2 mm and an inner diameter of about 90 mm, and the width in the longitudinal direction (the main heat exchange section 3 has substantially the same value due to the configuration) is about 250 m.
m. A large tube 42 made of SUS material and having a thickness of about 2.1 mm is provided on the inner peripheral surface of the sub heat exchange section 4. That is, the inner peripheral surface of the sub heat exchange portion 4 has a thickness of about 2.
It is covered with 1 mm of SUS material. Such a numerical value can be appropriately changed, and the large pipe 42 can be implemented without being provided if it is unnecessary.

Since the high-frequency oscillator 2 generates a large amount of heat by the transistors, transformers, capacitors, etc. provided inside, by converting the heat radiated from these devices d into liquid heating, further thermal efficiency can be obtained. It is possible to obtain. Therefore, it is also effective to form the liquid passage 20 and the heat exchanging portions 2a ... Around these devices inside the high-frequency oscillator 2 as needed and implement them (FIG. 8).

Next, a system for sending a liquid to be heated, that is, a liquid used for heat exchange will be briefly described. Main heat exchange part 3
Passage 30 (including the main pipe 31, if any),
The liquid 40 may be separately passed through the passages 40 of the auxiliary heat exchange unit 4, but may be in communication and the liquid may circulate. As described above, when heat exchange is performed also in the coil 1 and the high frequency oscillator 2, the liquid passing through these may be in contact with each other, or may not be in contact with each other. It can be selected as required.

For example, in the embodiment shown in FIG. 7, the main heat exchange section 3 (the passage 30 thereof), the coil 1 and the sub heat exchange section 4 (the passage 40 thereof) are respectively introduced from the introduction ends P1, P2 and P3. , The heating liquid L is separately fed from the outside. And
All the heated liquid is finally guided to the main pipe 31 and collectively sent to the outside. In this embodiment, the connecting pipe P2 sends the liquid, which has been heated by the high frequency oscillator 2, into the coil 1. When all the passages are in communication with each other in this way, in the liquid circulation path, the liquid first passes through the outside of the device (the passage 40 of the sub heat exchange section 4) and the inside (of the main heat exchange section 3). It is suitable that the passage 30) allows liquid to circulate later and is finally heated. However, it is appropriate that the temperature of the liquid passing through the outside of the device (the passage 40 of the auxiliary heat exchange section 4) is lower than the temperature of the liquid passing through the inside (including the coil 1) of that. is there. This is because when a liquid having a high temperature first flows to the outside, heat loss occurs due to heat radiation in the radially outward direction of the auxiliary heat exchange section 4.

Further, the main pipe 3 which becomes such a manifold
A system example of each liquid transfer in the case where 1 is not used will be briefly described with reference to FIGS. 8, 9, 10, and 11.

In FIG. 8, the passages for passing the liquid are completely independent and do not circulate. That is, the liquid such as water that has entered the passage 40 from the end P11 of the passage 40 becomes warm water and is guided to the outside from the end P16. Similarly, the liquid such as water that has entered the coil 1 from the end P12 becomes hot water and is guided to the outside from the end P14. Also, the end P
The liquid such as water that has entered the passage 30 from 13 becomes hot water and is guided to the outside from the end P15. On the other hand, also in the passage 20 provided inside the high-frequency oscillator 2, heat is exchanged by receiving heat from a device that generates a large amount of heat. That is, the liquid such as water entering from the end portion P10 receives the heat generated by the device from the heat exchanging portions 2a ... And becomes hot water and is guided to the outside from the end portion P17.

The one shown in FIG. 9 circulates the liquid in one system. That is, all passages connect. First, from the end P100 of the passage 20 to the high frequency oscillator 2
The liquid that has entered the inside is the end P170 and the end P of the coil 1.
It is guided into the coil 1 via the connecting pipe T1 which is interposed between the coil 120 and the coil 120. The liquid flowing out from the end P140 of the coil 1 is
It enters into the passage 40 of the auxiliary heat exchange section 4 through the connecting pipe T2 interposed between this end portion P140 and the end portion P110 of the passage 40. The liquid exiting the passage 40 enters the passage 30 of the main heat exchange unit 3 from the end P130 via the connecting pipe T3 interposed between the end P160 of the passage 40 and the end P130 of the passage 30. After passing through the passage 30, the liquid is guided to the outside from the end P150.

The one shown in FIG. 10 has two paths of liquid. That is, in one system, the liquid enters the passage 20 from the end P101, passes through the inside of the coil 1 via the connecting pipe T10 interposed between the end P171 and the end P121 of the coil 1, and ends of the coil 1 It goes out from the part P141. Then, in the other system, liquid enters the passage 30 from the end P131 of the passage 30, and from the end P151 of the passage 30 to this end P151 and the end P111 of the passage 40 of the auxiliary heat exchange unit 4. It is guided to the inside of the passage 40 through the communication pipe T30 interposed between the end portions P161 and outside.

The one shown in FIG. 11 also has two liquid paths. In one system, liquid enters the passage 20 through the end P102 and the other end P172 of the passage 20.
From the end portion P172 to the end portion P112 of the passage 40 of the auxiliary heat exchange section 4 through the connecting pipe T11 to the passage 40, and exits from the end portion P162 to the outside of the passage 40. is there. The other system is the end P12 of the coil 1.
2 into the coil 1, and from the other end P142 of the coil 1 through the connecting pipe T12 interposed between this end P142 and the end P132 of the passage 30 of the main heat exchange section 3, Enter the passage 30 from the end P132, and then the end P15
It goes to the outside from 2.

The present invention can be carried out even if the liquid circulates through a system or route other than the above, and is not limited to the above embodiment.

In each of the embodiments described above, the main heat exchange section 3 is arranged at the center of the apparatus, one coil 1 is arranged outside thereof, and one sub heat exchange section 4 is arranged outside thereof. The present invention can be implemented even if it has the following configuration (not shown). A plurality of coils 1 having different (spiral) diameters are arranged so as to be concentric, the main heat exchange section 3 is arranged inside the outermost coil 1, and the sub heat exchange is arranged outside the outermost coil 1. Not only the part 4 is arranged, but also between the coils located in the middle between the outermost coil 1 and the outermost coil 1, 1,
Alternatively, it may be implemented by separately arranging a heat exchange section between the coil positioned in the middle of the coil and the outermost central portion and the outermost coils 1, 1. That is, all the heat exchange parts are formed between the plurality of coils. For example, when there are two coils, the heat exchange part (main heat exchange part), the coil,
The heat exchange section, the coil, and the (sub) heat exchange section are arranged. Of course, if the number of coils is increased beyond this, the number of heat exchange parts may be increased correspondingly. Even when a plurality of coils are arranged in this way, regarding one coil, if the heat exchange section located inside the coil is considered as the main heat exchange section, and the one located outside the coil is considered as the sub heat exchange section. Good (in this case the outer heat exchange part is the auxiliary heat exchange part of this coil and at the same time the main heat exchange part of the outer coil).

The liquid heating apparatus according to the present invention is for boiling water or heating other liquids by using a means of electromagnetic induction heating which is clean and highly safe. still,
The final goal may be to heat water or other liquids,
In addition, such a liquid may be heated as a medium for supplying heat to another, and can be widely used regardless of the purpose of heating the liquid.

Since the device according to the present invention does not use gas, the device according to the present invention is safe, clean, and the like. Therefore, the device according to the present invention is a hospital, a nursing home, a high-rise building, an underground mall, an office. Furthermore, in a region where the gas diffusion rate is low (including overseas), it is possible to heat a liquid such as a kettle that is extremely suitable for such an environment. Particularly, since the heat conversion efficiency is remarkably improved, the miniaturization thereof is also remarkably improved.

[0040]

By implementing the first invention of the present application, it is possible to exchange heat even with respect to the magnetic flux generated outside the magnetic flux generating coil which has been conventionally suppressed, that is, the magnetic flux outside the coil which has been conventionally suppressed. Regarding the above, we decided to actively use this as a target for heat exchange by changing the way of thinking. That is, in order to capture all the magnetic field of the generated flux (magnetic field lines) without loss, one coil forms a closed magnetic structure by confining the coil from the outside, and water is caused to flow from the heated metal body. It takes heat. As a result, the heat conversion efficiency could be significantly improved as compared with the conventional one. Also, the heating rate could be significantly improved. Furthermore, since the expensive silicon steel plate conventionally used for suppressing the magnetic flux is not used, it is also advantageous in terms of cost.

By carrying out the second invention of the present application, the above first
In addition to the effect of the invention described above, the heat generated in the coil 1 itself can be exchanged with the liquid, and the heat conversion efficiency is further improved. That is, for coil cooling,
Water was normally used, but this water was discarded. By carrying out the present invention, such water is taken in and utilized.

By carrying out the third invention of the present application, the above first
Alternatively, in addition to the effect of the second invention, the magnetic attenuation can be suppressed by forming the magnetic path in the iron between the ends of both the main heat exchange section and the sub heat exchange section. As a result, it has become possible to further reduce energy loss.

By carrying out the fourth invention of the present application, the above first
Alternatively, in addition to the effect of the second or third invention, it is possible to recover the magnetic loss generated inside the high-frequency oscillator 2 as heat, and improve the heat conversion efficiency to a more complete state. Obtained.

[Brief description of drawings]

FIG. 1 is a perspective view of an essential part showing an embodiment of the present invention.

FIG. 2 is a partial cutaway perspective view showing an embodiment of the present invention.

FIG. 3 is an exploded perspective view of essential parts showing an embodiment of the present invention.

FIG. 4 is a side view of an essential part showing an embodiment of the present invention.

FIG. 5 is a perspective view of an essential part showing an embodiment of the present invention.

FIG. 6 is a partial cutaway perspective view showing an embodiment of the present invention.

FIG. 7 is a schematic vertical sectional view of an essential part showing an embodiment of the present invention.

FIG. 8 is a schematic vertical sectional view of an essential part showing an embodiment of the present invention.

FIG. 9 is a schematic vertical sectional view of an essential part showing an embodiment of the present invention.

FIG. 10 is a schematic vertical sectional view of an essential part showing an embodiment of the present invention.

FIG. 11 is a schematic vertical sectional view of an essential part showing an embodiment of the present invention.

FIG. 12 is an explanatory diagram of the principle of electromagnetic induction heating.

FIG. 13 is an explanatory diagram of the principle of electromagnetic induction heating.

FIG. 14 is an explanatory diagram of a problem when using electromagnetic induction heating.

FIG. 15 is an explanatory diagram of a problem when using electromagnetic induction heating.

[Explanation of symbols]

 1 coil 2 high frequency oscillator 3 main heat exchange part 4 sub heat exchange part 30 passage 40 passage

Claims (4)

[Claims] 1. At least one coil for generating magnetic flux
(1), a high-frequency oscillator (2) that supplies a high-frequency current to this coil (1), a main heat exchange part (3) made of a material that receives magnetic flux to generate heat, and also generates magnetic heat by receiving magnetic flux. The main heat exchange part (3) is provided with a sub heat exchange part (4) formed of a material, and the main heat exchange part (3) is a passage (30) for passing a liquid to be heated.
Is provided inside the coil (1) (A), and the auxiliary heat exchange section (4) is a passage (40) for passing the liquid to be heated.
Is provided outside the coil (1), and the main heat exchange section (3) generates heat by electromagnetic induction of the coil (1) and heats the liquid passing through the passage (30). In addition to doing
A liquid heating apparatus using electromagnetic induction heating, wherein the sub heat exchange section (4) also generates heat by electromagnetic induction of the coil (1) and heats the liquid passing through the passage (40). 2. The coil (1) is formed by spirally arranging a long conductor (11), and the conductor (11) has a passage through which a liquid passes. The electromagnetic induction heating according to claim 1, which is a tubular body forming (13), and heats the liquid passing through the passage (13) by heat generation of the conductor (11) when energized. Liquid heating device used. 3. The main heat exchange part (3) is formed as a substantially columnar body and is arranged inside the coil (1),
Collar-shaped parts (6) (6) are provided near both ends, and these collar-shaped parts (6) (6) are located near both ends of the coil (1) to the main heat exchange part.
(3) The liquid heating device utilizing electromagnetic induction heating according to claim 1 or 2, wherein the liquid heating device protrudes radially outward. 4. A heat exchange section (2a) is also formed inside the high frequency oscillator (2), and the heat exchange section (2a) is also formed inside the heat exchange section (2a).
The liquid heating apparatus using electromagnetic induction heating according to claim 1, 2 or 3, wherein an appropriate passage (20) for passing a liquid to be heated is provided.