JP2004316943A - Water heater - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To heat water with a simple structure without generating CO and CO<SB>2</SB>. <P>SOLUTION: This water heater has a rotary magnet cylindrical body 1 for fixing a permanent magnet in a nonmagnetic cylindrical body so that an N pole and an S pole are alternately arranged in the circumferential direction on a cylindrical body surface, and a conductive pipe 2 wound in a coil shape by surrounding the periphery of the magnetic cylindrical body 1, heated by induction heating by generating an alternating filed by rotation of the magnet cylindrical body 1, and allowing hot water to flow out by heating the water from the other end by flowing in from one end. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a water heater for heating water by passing water through a conductive pipe heated by induction heating by rotation of a permanent magnet.
[0002]
[Prior art]
In order to heat water, there are known one that uses heat generated by a nichrome heater, one that uses heat generated by a ceramic heater, and one that uses heat generated by gas combustion. Further, a device utilizing high-frequency induction heating is known (see Patent Document 1).
[0003]
[Patent Document 1]
JP-A-11-3770
[Problems to be solved by the invention]
Among conventional heating systems, those utilizing heat generated by a nichrome heater are inferior to gas combustion in terms of thermal power and heating speed, and are not suitable for instantaneous water heaters. A heater utilizing heat generated by a ceramic heater has higher thermal efficiency than a nichrome heater, but is used only for a small heater. In the case of using heat generated by gas combustion, although there is a heating speed, CO / CO ₂ which causes global warming is emitted, so an exhaust / ventilation device is required. Further, the high-frequency induction heating has a drawback that the manufacturing cost of the apparatus is increased because the high-frequency is used.
[0005]
Thus, the present invention provides a water heater that can heat water with a simple structure without generating CO / CO ₂ .
[0006]
[Means for Solving the Problems]
The water heater of the present invention comprises: a rotating magnet cylinder in which permanent magnets are fixed such that N poles and S poles are alternately arranged in a circumferential direction on a surface of the cylinder in a non-magnetic cylinder; It is wound in a coil shape around the cylindrical body, and the rotation of the magnet cylindrical body generates an alternating magnetic field, generates heat by induction heating, water flows in from one end, is heated from the other end, and warm water flows out And a conductive pipe.
[0007]
BEST MODE FOR CARRYING OUT THE INVENTION
The water heater of the present invention is composed of a strong permanent magnet in which N poles and S poles are alternately arranged, and the magnet cylinder uses a motor as a drive source and can rotate at high speed. A good conductive pipe such as a copper pipe is arranged on the outer periphery of the magnet cylinder. This pipe has two entrances. By rotating the magnet cylinder at high speed, an alternating magnetic field is generated, an induced current (eddy current) is generated in the pipe, and heat is generated by Joule heat. At this time, when water is poured from one of the pipes, hot water can be continuously obtained from the other.
[0008]
FIG. 1 is a schematic view showing a main part of a water heater of the present invention, FIG. 2 (a) is a sectional view taken along the line AA in FIG. 1, and FIG. 1 (b) is a sectional view showing the arrangement of magnets in a magnet cylinder.
[0009]
1 and 2A, a conductive pipe 2 is arranged around a rotating magnet cylinder 1. The shaft 3 of the magnet cylinder 1 is supported by a pair of bearings 4 arranged with the magnet cylinder 1 interposed therebetween, and one end of the shaft 3 is connected to a driving motor 6 via a coupling 5.
[0010]
The conductive pipe 2, for example, the copper pipe 2 is wound in a coil shape around the magnet cylinder 1, water flows in from one end, and the inflowing water is heated by the copper pipe 2 heated by the induction heating. It flows out as warm water from the other end. The copper pipe 2 and the magnet cylinder 1 are arranged so that the distance between them is as short as about 10 mm for efficient induction heating.
[0011]
In FIG. 2B, a permanent magnet 7 is fixed to a magnet cylinder 1 in a nonmagnetic cylinder 1a such as stainless steel so that N poles and S poles are alternately arranged on the surface of the cylinder. I have. A strong magnet is used as the permanent magnet 7, and for example, a neodymium-based magnet is suitable.
[0012]
When the magnet cylinder 1 is rotated at several hundred rpm to two hundred and several hundred rpm by the driving motor 6, an eddy current is generated in the copper pipe 2 by the alternating magnetic field, and heat is generated, and flows into the copper pipe 2 from one end. The generated water is heated by the heated copper pipe 2 and flows out from the other end as warm water.
[0013]
The heat generated by the copper pipe 2 can be adjusted by appropriately changing the strength of the permanent magnet of the magnet cylinder 1, the number of magnets, and the rotation speed.
[0014]
【Example】
A magnet cylinder having a surface magnetic velocity density of 12 and a 5600 gauss neodymium magnet fixed in a 135 mm diameter stainless steel cylinder so that N and S poles are alternately arranged is rotated at 1500 rpm. When water of a water pipe flows at a flow rate of 2 liters / min from one end of a copper pipe having an inner diameter of 150 mm, a thickness of 1.2 × 8 mm, and a number of turns of 30 and surrounding, water of 18 ° C. flows from the other end to 45 ° C. Came out to rise.
[0015]
【The invention's effect】
The water heater of the present invention has the following effects.
[0016]
(1) Unlike the gas combustion method, since electricity is used, CO / CO ₂ is not generated in the use environment, so that an exhaust / ventilation device is unnecessary.
[0017]
(2) Since it is composed of a magnet rotating body having a permanent magnet, a pipe-shaped conductor surrounding it, and a highly versatile motor as a drive source, the structure is simple and can be manufactured at low cost. It is hard to break down, and even in the event of a breakdown, it is easy to quickly obtain a replacement and easy to maintain.
[0018]
(3) Compared with the nichrome heater and the ceramic heater, the induction heating method is used, so that the object to be heated can be directly heated, so that the thermal efficiency is high.
[0019]
(4) The temperature can be easily adjusted by adjusting the number of revolutions of the motor with an inverter or the like.
[Brief description of the drawings]
FIG. 1 is a schematic view showing a main part of a water heater of the present invention.
2A is a cross-sectional view taken along line AA of FIG. 1, and FIG. 2B is a cross-sectional view showing an arrangement of magnets in a magnet cylinder.
[Explanation of symbols]
1: magnet cylinder 1a: cylinder 2: conductive pipe (copper pipe)
3: shaft 4: bearing 5: coupling 6: drive motor 7: permanent magnet

Claims (1)

A rotating magnet cylinder in which permanent magnets are fixed such that N poles and S poles are alternately arranged circumferentially on the surface of the cylinder in a non-magnetic cylinder, and a coil surrounding the magnet cylinder. And a conductive pipe that generates an alternating magnetic field by rotation of the magnet cylinder and generates heat by induction heating, water flows in from one end and is heated from the other end, and hot water flows out. Characterized water heater.

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