# US 5,350,901 A · Electromagnetic induction steam generator

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- Number: US 5,350,901 A
- Document ID: US5350901A
- Status: Granted
- Kind: A
- Application number: 08/004,118
- Filed: 1993-01-13
- Granted: 1994-09-27
- Earliest claimed: 1992-07-27
- Assignees: Nikko Co., Ltd.; Senko Denki Corporation Ltd.
- Inventors: Atsushi Iguchi; Kuniaki Iguchi
- Web page: https://patentgrep.com/patent/US5350901A

## CPC

- H05B 6/108: {for heating a fluid}
- B24B 49/105: {using eddy currents}
- F22B 1/281: {other than by electrical resistances or electrodes}
- H05B: ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- B24B: MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING (grinding of gear teeth B23F, of screw-threads B23G1/36; by electro-erosion B23H; abrasive or related blasting B24C; tools for grinding, buffing or sharpening B24D; polishing compositions C09G1/00; abrasives C09K3/14; electrolytic etching or polishing C25F3/00; grinding arrangements for use on assembled railway tracks E01B31/17); DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- F22B: METHODS OF STEAM GENERATION; STEAM BOILERS

## Abstract

An electromagnetic induction steam generator is compact or ultra-compact and highly efficient, and capable of continuous operation, intermittent operation and empty-heating operation. Magnetic flux passes through a closed magnetic circuit of two leg iron cores, a heater, and a yoke iron core after a low-frequency alternating current is supplied from a power supply to electric wire coils. Joule heat is generated inside the heater by the permeation of magnetic flux. When fluid such as water, is supplied from the fluid supply port, it is heated and becomes steam within the heating chamber. The steam then emerges from the steam output port.

## Claims

### Claim 1

An electromagnetic induction steam generator comprising:
at least two leg iron cores wrapped by electric wires to form a coil around each core, said coil receiving a low-frequency alternating current from a power supply connected to said electric wires;
and a closed magnetic circuit directly connecting the inner side of each said leg iron core, at least one part of said closed magnetic circuit being a heater made of a metallic material to permit flux permeation and to resist corrosion which can be heated by Joule heat,
wherein said heater has a fluid supply port and a steam output port, and said heater has a hollow chamber in its central portion and uses a gas-liquid separator, wherein said heater is capable of producing steam from fluid supplied to said hollow chamber through said fluid supply port.

### Claim 2 (depends on 1)

An electromagnetic induction steam generator as set forth in claim 1, wherein a part of said closed magnetic circuit connecting each end of at least two leg iron cores is a yoke iron core.

### Claim 3 (depends on 1)

An electromagnetic induction steam generator as set forth in claim 1, wherein parts of said closed magnetic circuit connecting the inner sides of each leg iron core are heaters.

### Claim 4 (depends on 3)

An electromagnetic induction steam generator as set forth in claim 3, wherein said heaters are linked by a connecting hose.

### Claim 5 (depends on 1)

An electromagnetic induction steam generator as set forth in claim 1, wherein said leg iron cores comprise wound cores.

### Claim 6 (depends on 1)

An electromagnetic induction steam generator as set forth in claim 1, wherein said fluid supply port is connected to a base of said heater and said steam output port is connected to a cover of said heater.

### Claim 7 (depends on 1)

An electromagnetic induction steam generator as set forth in claim 1, wherein a temperature detecting terminal connected to the metallic material, and is also connected to a temperature control

### Claim 8 (depends on 1)

An electromagnetic induction steam generator as set forth in claim 1, wherein said hallow chamber is located in a flow path of magnetic flux.

### Claim 9 (depends on 4, 5, 6, 7, 8)

An electromagnetic induction steam generator as set forth in one of claims 4-8 further comprising means to operate at a low-frequency alternating current of 50 Hz or 60 Hz.