JPH06123486A - Induction water heater - Google Patents

Abstract

PURPOSE:To improve a heat efficiency and a heating capability using electric power by providing an annular heating coil, and magnetic heating pipes oppositely disposed on the face and rear of the heating coil separated away by a predetermined distance and arranged densely on parallel virtual flat planes, folded on the face and rear of the heating coil. CONSTITUTION:An induction water heater 10 includes a heating coil 1 mounted annularly, and a proper coil driver circuit is connected with a terminal T of the heating coil 1. A heating pipe 2 is disposed on one surface side 1a of the substantially disk-shaped heating coil 1 oppositely to the coil separated away by a predetermined distance from the surface side flat face 1a. The heating pipe 2 comprises a magnetic material and is wound densely into a spiral layer to occupy substantially the same area as that of the heating coil 1. Alternating magnetic fluxes produce an eddy current in the heating pipe 2 located oppositely to the coil flat face 1a, and the heating pipe 2 produces heat with use of Joule heat due to the eddy current to heat water flowing in the pipe and making direct contact with the pipe.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an induction water heater which utilizes induction heating by alternating magnetic flux and can be used for an instantaneous water heater or the like.

[0002]

2. Description of the Related Art Conventionally, for heating water, it is generally known to use heat obtained by burning a fuel such as gas or petroleum. In some cases, hot water is prepared and stored in the boiler in advance and is used for hot water supply as needed.However, hot water is supplied from one end of a heat-resistant thin tube to the inside, and the thin tube is rapidly heated and discharged from the thin tube outlet. It is also often used as an instant water heater. In addition, although the boiler type has conventionally used electric power, there is no one using electric power as an instantaneous water heater.

By the way, the water heater using fuel as a heating source has the following drawbacks. 1. It is not good for the natural environment because it produces harmful components when burned. 2. A large amount of heat is released into the atmosphere as a hot gas, resulting in poor thermal efficiency. 3. Ventilation is required for safety. 4. The device is large because it has a heat exchange section.

The electric type has a low heating capacity at present and the water heating rate is slow, so that it can be used only for the hot water supply type, and the electric charge is a high price as an energy source. There is.

The hot water supply system has the following problems. I. Since hot water is supplied from the hot water storage part to the hot water use point by piping, there is always a certain amount of hot water in the pipe,
When hot water is supplied intermittently, the hot water in the pipe is unnecessarily cooled during the hot water supply, which wastes energy.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in view of the fact that the conventional induction water heaters have their respective problems as described above. It is an object of the present invention to provide a novel induction water heater which is remarkably better than the conventional one and can be used as an instant water heater because of its high water heating rate.

[0007]

[Means for Solving the Problems] In order to solve the problems,
In the first invention of the present application, an induction water heater is provided with a ring-shaped heating coil, a coil drive circuit that supplies alternating power to the heating coil, and a facing surface that is spaced apart from the heating coil flat surface by a predetermined distance. It is configured to include a heat generating pipe made of a magnetic material, which is bent on an imaginary plane parallel to the back surface and is densely arranged in one layer.

The induction water heater according to the second aspect of the present invention has an annular heating coil, a coil drive circuit for supplying alternating electric power to the heating coil, and a predetermined distance between the front and back surfaces of the heating coil. 2 are magnetic bodies densely arranged in a single layer by bending so that one side of the rectangle is located on an imaginary plane parallel to the front and back surfaces and has a rectangular cross section.
A heat generating pipe, and both heat generating pipes communicate with each other at one end.

[0009]

In the induction water heater according to the present invention, the heating pipe is heated by the eddy current generated by the alternating magnetic flux generated by the heating coil driven by the coil driving circuit.
The heat generating pipe is in direct contact with the running water inside the pipe, and the heat generating pipe itself generates heat and immediately heats the running water. Because of the structure, all the heat generated is transferred from the heat generating pipe to the running water inside, so that heat loss is extremely small, and there is almost no temperature rise in other parts. For this reason, the degree of freedom in designing each part is increased, and the structure can be made extremely thin.

Further, in the induction water heater according to the second invention of the present application,
Since the above-mentioned heat generating pipe has a rectangular cross section and is densely arranged in a single layer so that one side of this rectangle is located on an imaginary plane parallel to the front and back surfaces, the maximum density portion of the alternating magnetic flux generated by the heating coil is maximized. By aligning with the above-mentioned virtual plane, a large amount of magnetic flux passes through many parts of the heat generating pipe to heat strongly. Moreover, it is arranged on both sides of the heating coil.
The two heating pipes are connected at one end and are used in series, so the heating capacity is high.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the accompanying drawings. FIG. 1 is a side sectional view (a) and a front view showing an embodiment of the induction water heater according to the first invention of the present application.
The illustrated induction water heater 10 has a heating coil 1 wound in an annular shape, and a terminal T of the heating coil 1 is connected to an appropriate coil drive circuit PW (not shown).

One side of the heating coil 1 (1
The heat generating pipe 2 is disposed on the a surface side) so as to face the coil and be separated from the front flat surface 1a by a predetermined distance. The heating pipe 2 is made of a magnetic material such as 18-0SUS (stainless steel), and is wound in a spiral more densely and occupies substantially the same area as the heating coil 1. The predetermined distance is set so that the heat-generating pipe 2 is located over the entire length at the position L where the density of the alternating magnetic flux generated by the heating coil 1 is substantially maximum. In other words, the heat generating pipes 2 are densely arranged over the entire length so as to be located on the virtual plane L parallel to the front flat surface of the heating coil 1.

Internal passage (flowing passage) 2c of the heat generating pipe 2
The running water to be heated is passed through. That is, one end of the heat generating pipe 2 is an inflow end 2a into which the running water flows, and the other end is an outflow end 2b from which the heated running water becomes hot water and flows out. Tap water or the like is appropriately connected to the inflow end 2a through a valve mechanism, and the outflow end 2b is guided to an appropriate location for use.

The coil drive circuit PW (not shown) is
The well-known various circuits may be appropriately used, and the heating coil 2
In addition, a commercial frequency current may be supplied as it is, or a high frequency current may be supplied via an inverter circuit. In addition, an appropriate output adjusting means is added for adjusting the hot water temperature, and the supply current to the heating coil 2 is turned ON / OF even if it is interlocked with the valve means connected to the running water circuit 2c.
It is configured to be F.

Each of the above-mentioned parts is supported and housed in an appropriate casing, and is used as a heating source of a hot-water supply water heater or a heating part of an instantaneous water heater. The main portion of the induction water heater according to the present invention is 100 m because the thickness is mainly determined mainly by the diameters of the heating coil 1 and the heating pipe 2.
It is possible to make a thin device having a thickness of m or less, and it is particularly suitable in a thin form when used as an instant water heater installed in a kitchen.

The induction water heater 10 having the above-mentioned structure heats the pressurized water through the flowing water passage 2c extending from the inflow end 2a to the outflow end 2b and operating the coil drive circuit PW connected to the commercial power source. Coil 1 produces an alternating magnetic flux. This alternating magnetic flux generates an eddy current in the heat generating pipe 2 located opposite to the coil flat surface 1a, and the Joule heat generated by this eddy current causes the heat generating pipe 2 to generate heat and heat the water flowing inside which is in direct contact. . Therefore, the cold water supplied from the pressurized water source such as the water supply and flowing through the running water channel 2c inside the pipe passes through the heat generating pipe 2 between the inflow end 2a and the outflow end 2b, and is continuously heated during this time to obtain hot water of a predetermined temperature. Is taken out from the outflow end 2b and used.

As described above, according to the induction water heater of the present invention, the heating pipe 2, which is the heat generating portion, directly contacts the water flowing inside to heat it, so that the heat released to the outside unnecessarily. There is little, and thermal efficiency is good. Therefore, it is possible to obtain hot water of a desired temperature from the outflow end even if it is used in an instantaneous water heater with high heating efficiency. According to the present invention, there is no combustion mechanism, no exhaust gas is generated, cleanliness, safety, consideration of ventilation are unnecessary, and no adverse effect is exerted on the natural environment.

In order to further enhance the heating effect, a plurality of the above-mentioned basic constituent units (10) are connected in series,
If the induction water heater is configured such that each unit sequentially heats running water, hot water of higher temperature can be obtained. Similarly, the amount of water that can be used can be increased by connecting the basic structural unit units 10 in parallel.

Next, FIG. 2 shows an embodiment of the second invention of the present application, and is a side sectional view (a) and a front view. The illustrated induction water heater 20 is also a heating coil 1 wound in an annular shape.
The coil drive circuit PW (not shown) is connected to the terminal T of the heating coil 1.

Heat generating pipes 2A and 2B are arranged opposite to each other at a predetermined distance from the front and back flat end surfaces 1a and 1b of the substantially disk-shaped heating coil 1. This heating pipe 2
A and 2B are also made of a magnetic material (18-0SUS (stainless steel), etc.) and have a rectangular cross section (flattened rectangular pipe), which is wound more closely in a spiral shape and has substantially the same area as the heating coil 1. is occupying. Further, one side of the rectangular section is arranged along the heating coil 1 so as to match the virtual planes L and L ′ having the maximum magnetic flux density parallel to the front and back flat end surfaces of the heating coil 1 over the entire length. . Both heat generating pipes are continuous at the connecting portion 2d.

In the present invention, the internal passages 2c of both heat generating pipes
Is a running waterway. That is, one end of the heat generating pipe 2A is an inflow end 2a into which flowing water flows, and the other end communicates with one end of the heat generating pipe 2B. The end of the heat generating pipe 2B is heated running water. Is the outflow end 2b. In addition, in the embodiment, the heating pipes 2A and 2B are integrally formed by a single flat-angled pipe, but they are formed separately, and then the end portions (2d) are formed.
Part) may be formed so as to be joined by separate members.

Between the running water circuit and the heating coil 1, there is provided a magnetically permeable heat insulating member for thermally insulating the two. In the embodiment, it also serves as a coil case. The coil drive circuit PW (not shown) supplies the commercial frequency current as it is or the high frequency current via the inverter circuit as in the previous invention. An appropriate output adjusting means is added for adjusting the hot water temperature, and the supply current to the heating coil 2 is turned on / off in conjunction with the valve means connected to the flowing water circuit 2c. .

Each of the above-mentioned parts is supported and housed in an appropriate casing as in the previous embodiment, and is used as a hot-water supply water heater or an instantaneous water heater. The induction water heater according to the present invention can be formed to have a main part (heating coil 1 and heating pipes 2A, 2B) having a sufficiently thin thickness, and can be a thin device of 100 mm or less.

The induction water heater 20 having the above-mentioned structure allows the pressurized water to pass through the flowing water passage 2 extending from the inflow end 2a to the outflow end 2b and is connected to the commercial power source to the coil drive circuit P.
When W is operated, the heating coil 1 generates an alternating magnetic flux. This alternating magnetic flux is located opposite to both flat end faces of the coil and generates an eddy current in the heat generating pipes 2A and 2B, and the Joule heat generated by the eddy current causes the heat generating pipes 2A and 2B to generate heat and flow inside the direct contact. Heat the water. Therefore, the cold water supplied from the pressurized water source such as the water supply and flowing in the running water channel 2 sequentially passes through the heat generating pipes 2A and 2B between the inflow end 2a and the outflow end 2b, and is continuously heated to a predetermined temperature. It is taken out from the outflow end 2b and used as warm water.

As in the case of the previous invention, the heating pipes 2A and 2B, which are the heat generating portions, are in direct contact with the water flowing inside to heat it, so that the heat efficiency is good. Further, since the heat generating pipes are connected in series, the heating efficiency is higher. Of course, like the previous invention, it does not generate exhaust gas, is clean and safe, does not require consideration for ventilation, and does not adversely affect the natural environment.

In order to further enhance the heating effect, a plurality of the above-mentioned basic constituent units (20) are connected in series,
If the induction water heater is configured such that each unit sequentially heats running water, hot water of higher temperature can be obtained. Similarly, the amount of water that can be used can be increased by connecting the basic structural unit units 20 in parallel.

In the second invention of the present application, a pipe having a flat cross section is used as the heat generating pipe 2, and the flat distribution position of the highest density of the alternating magnetic flux generated by the heating coil (FIG. 1 (a), L and L ') are spirally and densely wound, and one side of the rectangular cross section is parallel to the flat end faces of the front and back of the heating coil 1 over the entire length and has a maximum magnetic flux density L. By arranging the heating coil 1 along the heating coil 1 so as to match L and L ′, it is possible to most effectively generate heat.

By the way, in other configurations (for example, the circular pipe 2'in FIG. 1), only a part of the wall portion (wall portion) of the pipe is made to coincide with the above-mentioned virtual planes L and L'where the magnetic flux density becomes maximum. However, the heating efficiency is inevitably low. Since each of the heat generating pipes 2A and 2B is a flat rectangular pipe and is spirally wound,
The heating coil 1 and the heating pipe 2A (2B) are sequentially arranged in succession because the heating coil 1 and the heating pipe 2A (2B) are sequentially arranged because the heating pipe 1 and the heating pipe 2A have two substantially flat portions each having one side formed over the entire length. As a result, it is possible to generate heat from both sides of one heat generating pipe, and to make it coincide with the maximum portion of the magnetic flux density. In this way, the induction water heater having a high heating capacity can be made extremely thin.

In addition, when the induction water heater according to each invention of the present application is configured as an instantaneous water heater, it is considered that the induction water heater may coexist with gas appliances in the kitchen. is necessary.

The induction water heaters according to the inventions of the present application are not limited to the above-mentioned embodiments, but can be modified in various ways and can be implemented by appropriately changing the material of the heat generating pipe and the like. Further, an appropriate functional layer (protective layer or the like) may be provided on the surface of the heat generating pipe. Further, the heat generating pipe may be bent and meandered in addition to being wound in a spiral shape. good.

[0031]

As described above in detail, the induction water heater according to the first invention of the present application has an annular heating coil, a coil drive circuit for supplying alternating electric power to the heating coil, and the heating coil having predetermined front and back surfaces. Since it has a heat generating pipe made of a magnetic material, which is arranged to face each other with a distance, and which is bent on an imaginary plane parallel to the front and back surfaces and is densely arranged, the thermal efficiency is good while using electric power, It has a high heating capacity and can therefore be used as an instant water heater. Moreover, it can be made small (thin). Of course, it is clean and hygienic, there is no risk of environmental pollution, and ventilation is not necessary.

Further, the induction water heater according to the second invention of the present application, in the above-mentioned structure, has a rectangular cross section, and is bent so that one side of the rectangle is located on an imaginary plane parallel to the front and back surfaces, and is densely packed. In addition to the above-mentioned effect, the heating capacity is particularly higher because the two heat generating pipes are provided and both heat generating pipes are connected to each other at one end.

[Brief description of drawings]

FIG. 1 is a side sectional view and a front view showing an embodiment of an induction water heater according to the first invention of the present application.

FIG. 2 is a side sectional view and a front view showing an embodiment of the induction water heater according to the second invention of the present application.

[Explanation of symbols]

 1 ... Heating coil, 2, 2A, 2B ... Heating pipe, 10, 20 ... Induction water heater.

Claims (2)

[Claims] 1. An annular heating coil (1), a coil drive circuit (PW) for supplying alternating power to the heating coil (1), and a predetermined distance between the heating coil front and back surfaces (1a, 1b). And an induction water heater (10) including: a heat generating pipe (2) made of a magnetic material, which is densely arranged more densely on a virtual plane (L) parallel to the front and back surfaces. 2. An annular heating coil (1) and a coil drive circuit for supplying alternating electric power to this heating coil.
(PW) and the front and back surfaces of the heating coil are arranged so as to be opposed to each other with a predetermined distance therebetween, and each side of the rectangle has a rectangular cross section.
Two heat-generating pipes (2) made of a magnetic material densely arranged in one layer so as to be located on a virtual plane (L, L ') parallel to (1a, 1b)
A, 2B), and an induction water heater (20) in which both heat generating pipes (2A, 2B) are connected at one end.