JP2009002616A - Induction heating water heater - Google Patents

Abstract

【Task】
An easy-to-use and safe induction heating water heater that can be connected to a water pipe to supply hot water by induction heating is provided.
[Solution]
A main body constituting the outer shell 1, a pipe 2 made of a magnetic material in which water is circulated inside the main body, a heating coil 12 wound around the outer periphery of the pipe 2, and a high-frequency current supplied to the heating coil 12 A high-frequency inverter circuit, an inner case 13 provided around the heating coil 12, and a cooling fan 14 for cooling the heating coil 12 using the inner case 13 as an air passage 13a. The intake port 15 and the exhaust port 16 are provided in the outer shell 1 of the main body below the heating coil 12.
[Selection] Figure 1

Description

  The present invention relates to an induction heating hot water supply apparatus mainly used in a water field such as a bathroom.

  In this type of conventional induction heating water heater, a stainless steel pipe, which is a magnetic material, is connected to a water supply, a heating coil is wound around the outer circumference of the stainless steel pipe, and a high-frequency current is passed through the heating coil to generate the heating coil. The stainless steel tube itself is induction-heated by the generated high-frequency magnetic field to generate heat, and the water in the stainless steel tube is heated by the heat of the stainless steel tube to supply hot water (for example, see Patent Document 1).

JP 2001-174055 A

  However, the following problems are raised in the above prior art. As the means for cooling the heating coil, which is a heating means, is only natural cooling by heat dissipation, there is a risk of exceeding the heat resistance of the heating coil itself, the temperature around the heating coil becomes high, and the adverse effect of heat on surrounding parts However, safety considerations are lacking.

  In addition, as a realistic container structure, a structure in which an outer case of the container is provided around the heating coil and electrical components such as the heating coil are insulated is considered. If an exhaust hole or the like for exhausting the heat accumulated in the upper part to the outside of the container is provided above the container, an induction heating water heater used in a water field is a heating coil by water intrusion from the exhaust port. Risks such as electric shock from are estimated and are not taken into account.

  In view of the above problems, an object of the present invention is to provide a safe induction heating hot water supply apparatus that is connected to a water supply and is mainly used in a water field and can supply hot water by induction heating.

  The present invention has been made in order to solve the above-described problems, and includes a main body constituting an outer shell, a pipe made of a magnetic material through which water is circulated, and an outer periphery of the pipe. A heating coil, a high-frequency inverter circuit for supplying a high-frequency current to the heating coil, an inner case provided around the heating coil, and a cooling fan for cooling the heating coil using the inner case as an air path Provided, and an inlet and an exhaust port of the cooling fan are provided on the outer periphery of the main body below the heating coil.

  Also, magnetic flux leakage prevention means made of a ferromagnetic material is provided on the surface facing the heating coil inside the inner case provided around the heating coil.

  The magnetic flux leakage prevention means is provided with a recess of a size that allows the magnetic flux leakage prevention means to enter the inner case in order to suppress an increase in air resistance of the cooling fan. The surfaces are provided so as to coincide with each other.

  The magnetic flux leakage prevention means is held by a holding plate having a gentle surface with respect to the windward so as to suppress an increase in air resistance of the cooling fan.

  Since the induction heating hot water supply apparatus of the present invention is configured as described above, the heating coil can be prevented from being heated to a high temperature, and the heat resistance of the heating coil itself can be prevented and adverse effects due to heat on surrounding components can be prevented. .

  In addition, since it is possible to prevent water droplets or the like poured from the upper part of the main body from entering the main body, it is possible to provide an induction heating hot water supply apparatus having excellent safety.

  In addition, leakage magnetic flux leaking around the body can be reduced, heating of the inner case and the like provided around the heating coil can be prevented, heating efficiency for hot water heating can be improved, and a high-frequency inverter circuit is included. The influence on the operation of the substrate unit can be reduced.

  Further, since the cooling air in the cooling air passage smoothly passes through the air passage, the heating coil can be efficiently cooled.

  An embodiment of the present invention will be described below with reference to FIGS.

  FIG. 1 is a longitudinal sectional view of an essential part of an induction heating hot water supply apparatus showing an embodiment of the present invention, FIG. 2 is a transverse sectional view along line AA of FIG. 1, and FIG. 3 is a pipe and heating according to an embodiment of the present invention. FIG. 4 is a sectional view for explaining the structure of the heating coil, FIG. 5 is a longitudinal sectional view of a main part of an induction heating water heater showing another embodiment of the present invention, and FIG. FIG. 7 is a sectional view taken along the line AA of FIG. 6, and FIG. 8 is an induction heating hot water supply showing another embodiment of the present invention. It is a principal part cross-sectional view of an apparatus.

  In the figure, the induction heating water heater main body constituting the outer shell 1 is used by being installed on a wall of a bathroom or the like.

  The pipe 2 is made of magnetic stainless steel or the like made of a magnetic material having rust prevention properties, and is arranged vertically in the outer shell 1 so as to be substantially vertical.

  The lower end of the pipe 2 is connected to the water pipe 5 via the lower joint 3 and the connecting pipe 4a, and the outlet 7 with a faucet is attached to the upper end via the upper joint 6a, the connecting pipe 4b and the upper joint 6b at the upper end. The outlet hose 8 is connected, and water from the water pipe 5 is circulated inside and can be discharged from the outlet 7 with a faucet. Moreover, the upper part and the lower part of the pipe 2 are being fixed to the outer shell 1 with the support member (not shown).

  The connection pipe 4a is provided with a water flow sensor 9, which can detect that water is flowing through the connection pipe 4a.

  A temperature detection sensor 10 is provided in the upper part of the pipe 2 so that the temperature of the water flowing through the pipe 2 can be detected.

  Around the pipe 2, a nonmagnetic cylinder 11 made of a nonmagnetic material such as ceramic is provided with a concentricity by a concentric plate 20 so as to be concentric with a certain gap.

  As shown in FIG. 3, the concentric plate 20 is provided with a plurality of alternately notches 20b and support portions 20a along the circumferential direction at the contact portion with the pipe 2, and adheres to the surface of the pipe 2 from the notches 20b. The dew condensation water 2b is allowed to flow downward.

  The nonmagnetic cylinder 11 is configured to be longer than its diameter, and the length of the nonmagnetic cylinder 11 is such that both ends of the pipe 2 protrude above and below the both ends of the nonmagnetic cylinder 11. It is a length. A heating coil 12 made of a litz wire 12a is wound around the outer peripheral surface of the non-magnetic cylinder 11, and a high frequency current is supplied to the heating coil 12 to inductively heat the pipe 2.

  As shown in FIG. 4, the litz wire 12a is wound with a coating material 12b made of, for example, a waterproof epoxy resin on the surface, and the litz wires 12a are fixed to ensure insulation.

  Around the heating coil 12, an inner case 13 made of a non-magnetic metal constituting an air passage 13a for cooling the heating coil is provided.

  The inner case 13 is provided with a cooling fan 14 that cools the heating coil 12. The cooling fan 14 takes in air from an air inlet 15 provided in the outer shell 1 of the main body below the heating coil 12, and takes in the air. Is provided between the inner case 13 and the heating coil 12 wound around the outer peripheral surface of the non-magnetic cylinder 11 to cool the heating coil 12 and then to the outer shell 1 of the main body below the heating coil 12. It is discharged out of the main body through the exhaust port 16. Further, the inner case 13 is integrally joined and fixed to the outer case 1 by screws or the like via a fixing member (not shown) that is fixed to the outer case 1.

  A plurality of magnetic flux leakage prevention means 17 composed of a vertically elongated ferromagnetic ferrite or the like is provided on the surface of the inner case 13 facing the heating coil 12 as a center. The inner case 13 is heated by the leakage magnetic flux of the heating coil 12 and the temperature rises, and the heating efficiency when heating the pipe 2 to warm water is improved.

  The magnetic flux leakage prevention means 17 is provided with a recess having a size that allows the magnetic flux leakage prevention means 17 to enter the inner case 13 so as not to cause an air resistance of the air blown by the cooling fan 14 that cools the heating coil 12. The surface of the inner case 13 and the surface of the magnetic flux leakage prevention means 17 are provided so as to coincide with each other.

  As shown in FIG. 5, the magnetic flux leakage prevention means 17 is a streamlined holding plate having a gentle inclined surface with respect to the windward so that the air resistance of the cooling fan 14 for cooling the heating coil 12 does not increase. 21 may be attached along the inner surface of the inner case 13. By doing so, it is not necessary to provide the inner case 13 with a recess large enough for the magnetic flux leakage prevention means 17 to enter, the structure is simplified, and the magnetic flux leakage prevention means 17 can be securely attached to the inner case 13. Further, the cooling air can smoothly pass through the air passage 13a and the heating coil 12 can be efficiently cooled.

  Further, as shown in FIGS. 6 and 7, the magnetic flux leakage prevention means 17 is provided on four surfaces in the circumferential direction of the heating coil 12 having a length substantially the same as the diameter of the heating coil 12, and the same in the vertical direction. A plurality of sets of magnetic flux leakage prevention means 17 having the shape may be provided to prevent magnetic flux leakage.

  Further, the inner case 13 may be formed in a cylindrical shape instead of a square box shape as shown in FIG. 8, and by adopting such a shape, the inner case 13 and the non-magnetic material are compared with those in the square shape. Cooling air flows smoothly between the heating coils 12 wound around the outer peripheral surface of the cylinder 11, and the heating coils can be cooled more efficiently.

  A substrate unit 18 including a high-frequency inverter circuit that supplies a high-frequency current to the heating coil 12 is disposed in an appropriate space position in the outer shell 1 and is waterproofed with a filling material such as potting, and the litz wire 12a of the heating coil 12 is provided. Both terminals 19 are connected, and a high-frequency current is supplied to the heating coil 12.

  Detection signals from the water flow sensor 9 and the temperature detection sensor 10 are input to the substrate unit 18. When no water flows through the connection pipe 4 a due to the detection signal from the water flow sensor 9, the heating coil 12 is not energized. Control to ensure safety. Further, the energization control of the heating coil 12 is performed so that the hot water temperature becomes constant by the detection signal of the temperature detection sensor 10.

  The present invention has the above configuration, and the operation thereof will be described next.

  The water supplied from the water pipe 5 to the connecting pipe 4 a flows into the pipe 2 from the lower side of the pipe 2 and is heated by the heating coil 12 wound around the nonmagnetic cylinder 11 on the outer periphery of the pipe 2. From the top of the pipe 2 to the outlet hose 8 and flows out from the outlet 7 with a faucet as hot water.

  On the other hand, when the cooling fan 14 is driven by the substrate unit 18, the outside air is sucked from the intake port 15 provided in the outer shell 1 and wound around the outer surface of the inner case 13 and the nonmagnetic cylinder 11 constituting the air passage 13 a. After flowing into the heating coil 12 and cooling the heating coil 12, it is discharged to the outside of the outer shell 1 through the exhaust port 16.

  When adjusting the hot water temperature, the amount of power supplied to the heating coil 12 from the substrate unit 18 that controls the energization operation of the heating coil 12 is adjusted, or the inflow amount of water from the water pipe 5 and the outlet with a faucet Adjust the amount of hot water discharged from 7 to obtain the desired hot water temperature.

  According to the present invention, it is possible to prevent the heating coil 12 from reaching a high temperature, and to prevent the heat resistance of the heating coil 12 itself from being exceeded or adverse effects due to heat on surrounding components.

  In addition, since it is possible to prevent water droplets or the like poured from the upper part of the main body from entering the main body, it is possible to provide an induction heating hot water supply apparatus having excellent safety.

  In addition, leakage magnetic flux leaking around the main body can be reduced, heating of the inner case 13 provided around the heating coil 12 and the like can be prevented, heating efficiency for hot water heating can be improved, and a high-frequency inverter circuit The influence on the operation of the substrate unit 18 including can be reduced.

  Further, the cooling air in the air passage 13a can smoothly pass through the air passage 13a and the heating coil 12 can be efficiently cooled.

It is a principal part longitudinal cross-sectional view of the induction heating hot-water supply apparatus which shows one Example of this invention. It is the sectional view on the AA line of FIG. It is sectional drawing explaining the structure of the pipe and heating coil which concern on one Example of this invention. It is sectional drawing explaining the structure of a heating coil similarly. It is a principal part longitudinal cross-sectional view of the induction heating hot-water supply apparatus which shows another Example of this invention. It is a principal part longitudinal cross-sectional view of the induction heating hot-water supply apparatus which shows another Example of this invention. It is the sectional view on the AA line of FIG. It is a principal part cross-sectional view of the induction heating hot-water supply apparatus which shows other one Example of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Outer 2 Pipe 12 Heating coil 13 Inner case 13a Air path 14 Cooling fan 15 Intake port 16 Exhaust port 17 Magnetic flux leakage prevention means 21 Holding plate

Claims (4)

  A main body constituting the outer shell, a pipe made of a magnetic material in which water is circulated in the main body, a heating coil wound around the outer periphery of the pipe, and a high-frequency inverter circuit for supplying a high-frequency current to the heating coil; An internal case provided around the heating coil, and a cooling fan for cooling the heating coil using the internal case as an air passage, and an intake port and an exhaust port of the cooling fan are provided below the heating coil. An induction heating hot water supply apparatus provided on an outer shell of the main body.   The induction heating hot water supply apparatus according to claim 1, wherein magnetic flux leakage prevention means made of a ferromagnetic material is provided on a surface facing the heating coil inside the inner case provided around the heating coil. A feature of the induction heating hot water supply device.   3. The induction heating hot water supply apparatus according to claim 2, wherein the magnetic flux leakage prevention means is provided with a recess having a size that allows the magnetic flux leakage prevention means to enter the inner case in order to suppress an increase in air resistance of the cooling fan. An induction heating hot water supply apparatus, wherein the surface of the case and the surface of the magnetic flux leakage prevention means are provided to coincide with each other.   3. The induction heating hot water supply apparatus according to claim 2, wherein the magnetic flux leakage preventing means is held by a holding plate having a gentle surface with respect to the windward so as to suppress an increase in air resistance of the cooling fan. Heating water heater.

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