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Title:
GAS COOLING TYPE VACUUM HEAT TREATING FURNACE AND COOLING GAS DIRECTION SWITCHING DEVICE
Document Type and Number:
WIPO Patent Application WO/2005/001360
Kind Code:
A1
Abstract:
A gas cooling type vacuum heat treating furnace, comprising a gas cooling furnace having a cooling chamber allowing the stationary placement of a treated article therein and forming a gas flow passage in the vertical direction, a gas cooling/circulating device circulatingly cooling gas flowing in the cooling chamber, a gas direction switching device alternately switching the direction of the gas vertically passing the inside of the cooling chamber, and upper and lower straighteners closing the upper and lower ends of the cooling chamber to uniformize the velocity distribution of the gas passing the cooling chamber.

Inventors:
Katsumata, Kazuhiko c/o ISHIKAWAJIMA-HARIMA HEAVY INDUSTRIES CO. (LTD. 2-1 Ohtemachi 2-chom, Chiyoda-ku Tokyo 82, 10081, JP)
Application Number:
PCT/JP2004/004643
Publication Date:
January 06, 2005
Filing Date:
March 31, 2004
Export Citation:
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Assignee:
ISHIKAWAJIMA-HARIMA HEAVY INDUSTRIES CO. LTD. (2-1 Ohtemachi 2-chome, Chiyoda-ku Tokyo, 82, 10081, JP)
Katsumata, Kazuhiko c/o ISHIKAWAJIMA-HARIMA HEAVY INDUSTRIES CO. (LTD. 2-1 Ohtemachi 2-chom, Chiyoda-ku Tokyo 82, 10081, JP)
International Classes:
F27B5/16; F27B17/00; F27D7/04; F27D9/00; (IPC1-7): F27D9/00; F27B5/16
Foreign References:
JPH11153386A
JPH05230528A
JPH051887A
JPS6115079A
CN1426484A
Other References:
See also references of EP 1643199A1
Attorney, Agent or Firm:
Hotta, Minoru (ASA International Patent Firm 4F, Kenchiku Kaikan 26-20, Shiba 5-chom, Minato-ku Tokyo 14, 10800, JP)
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