Metallurgical apparatus – Means for melting or vaporizing metal or treating liquefied... – Spray refining means
Reexamination Certificate
2006-12-19
2009-06-30
Mayes, Melvin C (Department: 1793)
Metallurgical apparatus
Means for melting or vaporizing metal or treating liquefied...
Spray refining means
C075S343000
Reexamination Certificate
active
07553443
ABSTRACT:
A metal powder production apparatus includes a supply part for supplying molten metal and a nozzle provided below the supply part. The nozzle is provided with a flow path defined by an inner circumferential surface of the nozzle through which the molten metal supplied from the supply part can pass. The inner circumferential surface of the nozzle has a gradually reducing inner diameter portion whose inner diameter is gradually reduced in a downward direction. The nozzle is further provided with an orifice opened at a bottom end of the flow path and adapted to inject water toward the flow path. The nozzle has a first member having the gradually reducing inner diameter portion and a second member provided below the first member with a space left between the first member and the second member. The orifice is defined by the first member and the second member. A heat absorption body is provided on the first member. The absorption body serves as a restraint means for, when heated, deforming a surrounding region of the gradually reducing inner diameter portion of the first member to thereby restrain the orifice from being enlarged by the pressure of the water passing through the orifice.
REFERENCES:
patent: 4624409 (1986-11-01), Takeda et al.
patent: 5058856 (1991-10-01), Gordon et al.
patent: 5366204 (1994-11-01), Gigliotti, Jr. et al.
patent: 03-55522 (1991-08-01), None
Nakabayashi Koei
Shimura Tokihiro
Tanaka Mitsutoyo
Tanaka Yoshinari
Corno James
Harness & Dickey & Pierce P.L.C.
Mayes Melvin C
Seiko Epson Corporation
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