Induction melting system including gas exhaust
AssigneeFuji Electric Co., Ltd.
InventorsHiroshi Otsuka, Tsuguharu Omori, Michio Kawasaki
Life of this patent
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Abstract
An annular exhaust gas passage 2 and an airtight retention member 3 for keeping the inside of a crucible induction furnace 1 airtight are installed on the top of the furnace 1, and an exhaust system under atmospheric pressure is connected to a valve 4 via an air duct that penetrates the airtight retention member 3. In addition, a sealing cover 7 that has a valve 8, which can be opened and closed, is used to keep the inside of the furnace airtight, while a system under reduced pressure is connected to the valve 8. These two systems constitute the entire exhaust system.
Claims6
An induction melting system comprising:
- a crucible induction furnace for melting material including galvanized steel-plate scraps;
- sealing means for sealing an inside of said furnace;
- and
- first and second exhaust means in communication with the inside of the furnace for selectively exhausting gas from said furnace through said sealing means, said first and second exhaust means including means for controlling flow through the first and second exhaust means,
- said first exhaust means placing the inside of said furnace under a first pressure during a first period and including
- an exhaust gas passage having a first end portion in fluid communication with the inside of said furnace and a second end portion in fluid communication with an exhauster, said first end portion of the exhaust gas passage extending inside the furnace and including an annular portion surrounding a top potion of said furnace and having at least one inlet port,
- said second exhaust means placing the inside of said furnace under a second pressure during a second period and including
- a pressure-reducing pump.
Dependencies are inferred from the claim text.