| 摘要 |
PROBLEM TO BE SOLVED: To cool members such as a valve disc or casing and to improve heat resistance by forming a vent part at an upstream side of the disc to close an air supply side at the time of exhausting, and supplying a small amount of the air from a vent part via a periphery of the disc even at the time of closing it. SOLUTION: When a valve disc 7 is forwarded to be brought into contact with a valve seat 6 at the time of burning the regenerative burner 4, a valve part of an exhaust passage 2 is closed, and the valve part of an air supply passage 1 is opened. Accordingly, the air from an upstream side of the passage 1 is supplied from a passage 3 to the burner 4 via a valve seat 5 for burning. The exhaust gas fed via the burner 4 is exhausted from the passage 3 at the passage 3 via the seat 6 by suction of an exhaust blower. In this case, ambient temperature air of the passage 1 is fed from a vent hole 11 of a plate 10 to a gap 12 between the hole 11 and a valve disc 7 by suction of suction of an exhaust blower, fed via a periphery of the disc 7, and exhausted via the passage 2 together with exhaust gas. At this time, the ambient temperature air fed from the passage 1 cools the disc 7 and the casing. |
