| 摘要 |
PROBLEM TO BE SOLVED: To enhance detection accuracy of the outer air temperature sensor of a circulation grain dryer. SOLUTION: In a circulation grain dryer, an outer air inlet box 18 is disposed above a duct front 14 facing the hot air chamber 5 of a drying chamber 2, a burner 15 is disposed in the duct front 14 and a large number of slits 19, 19, ... are made in the upper surface 14a and the left/right side faces 14b, 14b of the duct front 14 so that outer air flows in through the slits 19, 19, ... An outer air temperature sensor 16 is disposed above the upper surface 14a of the duct front 14 at a part where the outer air passes toward the slits 19, 19, ...Since the effect of combustion heat from the burner 15 on the outer air temperature sensor 16 is reduced, temperature detection can be stabilized and since the outer air temperature sensor 16 can detects an extremely high temperature, failure of a suction fan for circulating drying air can also be detected.
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