To keep a risk lower and to prevent the generation of fracture trouble caused by abnormal pressure inside a hollow body in advance by reducing water leakage when the hollow body is developed with such as cracks.
A oven lid 12 comprises a hollow body 18 comprising an inner steel plate 14 and an outer steel plate 16 as a main body and a cooling means 19 is arranged to the inside of the hollow body 18. A discharging hole 26 is arranged to the hollow body 18 and cooling water being injected to the inside of the hollow body from the cooling means 19 and heat exchanged is discharged through the discharging hole 26 to the outside. A duct 28 is arranged to the outer steel plate 16 and the inside of the hollow body 18 is connected to the air through an opening 28a that is formed to the duct 28. A damper 30 being arranged to the free edge of the duct 28 openably closes the opening 28a with self-weight usually. When the internal pressure of the hollow body 18 exceeds a predetermined value, the damper 30 opens the opening 28a.
WATANABE TATSUYOSHI
NOMURA KIYOSHI
NAKANISHI YOICHI
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