HOT AIR CIRCULATION FURNANCE - NIPPON FURNACE KOGYO KK

Title:

HOT AIR CIRCULATION FURNANCE

Document Type and Number:

WIPO Patent Application WO/2006/021994

Kind Code:

A1

Abstract:

A hot air circulation furnace for heating an object to be heated up to a specified temperature by circulating hot air in the furnace. Although small in size, the furnace enables continuous processing and is capable of being provided with a heating zone and a soaking zone by using flows of hot air with the same temperature. The furnace is separated into an outer periphery side region (6) and an inner region (7) by an annular partition (8), floor, and paths (9, 10) near the ceiling. Hot air supplied from a heat source (5) is expelled by an axial-flow fan (11) toward a hearth (2), to the inner region (7). This forms in the furnace a circulation flow passing a to-be-heated object placement table (23) in an annular shape on the rotating hearth (2) installed in the outer periphery side region (6), and while the hearth (2) makes one rotation, to-be-heated objects on the table (23) are raised in temperature up to a predetermined level before taken out in sequence to the outside of the furnace. Further, a partition (12) whose opening on the exit side Ѳ₂ is smaller than whose opening on the entrance side Ѳ₁ is provided inside the annular partition (8). By this, the speed of a high-temperature gas discharged from the axial-flow fan (11) is partially increased and supplied to the to-be-heated object placement table (23).

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Inventors:

KURITA KIYOBUMI (JP)
SASAKI NOBORU (JP)
ITAKURA YUKIHARU (JP)

Application Number:

PCT/JP2004/012169

Publication Date:

March 02, 2006

Filing Date:

August 25, 2004

Export Citation:

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Assignee:

NIPPON FURNACE KOGYO KK (JP)
TOYOTA MOTOR CO LTD (JP)
KURITA KIYOBUMI (JP)
SASAKI NOBORU (JP)
ITAKURA YUKIHARU (JP)

International Classes:

F27B9/16; (IPC1-7): F27B9/16

Foreign References:

JPS5938322A	1984-03-02
JPH11201660A	1999-07-30
JP2002173708A	2002-06-21

Attorney, Agent or Firm:

Murase, Kazumi (12-7 Nishishimbashi 2-chom, Minato-ku Tokyo 03, JP)

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