Patent ID: 9033705
Filing Date: 2015-05-19
Classification: B23K,F27B,F27D

Abstract:
1. A heating furnace for heating a subject to be heated by radiation, comprising: a first chamber in which the subject will be placed, the first chamber including a first gas feed port configured to feed a first gas and a first gas exhaust port configured to exhaust the first gas; a second chamber placed adjacent to the first chamber and housing a heating source, and including a second gas feed port configured to feed a second gas and a second gas exhaust port configured to exhaust the second gas, the second gas being different from the first gas; a separation member for separating the first chamber and the second chamber and allowing a radiant ray from the heating source to pass through; a control section for changing atmospheric gas and atmospheric pressure in the first chamber and the second chamber by feeding the first gas into and out of the first chamber through the first feed port and the first exhaust port, respectively, and feeding the second gas into and out of the second chamber through the second feed port and the second exhaust port, respectively; and a gas sensing section provided in the second chamber or in an exhaust path to which gas is discharged from the second chamber to detect a concentration of the first gas in the second chamber or exhaust path, wherein: when the gas sensing section detects that the first gas is a predetermined concentration value or higher, the control section performs safety control to prevent the concentration of the first gas in the second chamber or the exhaust path from increasing, and the safety control includes stopping feeding of the first gas into the first chamber.