| 摘要 |
<p>PURPOSE:To discharge combustion gas containing combustible gas generated just after the starting of combustion, etc. automatically outside the hothouse, and to prevent the accumulation of ethylene gas inside the hothouse, in the device which directly forwards combustion gas into the hothouse for rearing a plant and heats the hothouse. CONSTITUTION:A changeover damper 7 closes a heated gas passage 5 while a discharged gas passage 4 is opened because an electromagnet 8 is not excited and a lifting rod 9 is under a falling condition under a condition that a burner 1 is stopped. When a solenoid valve 13 is opened and the burner 1 is burnt under this condition, a timer is started while combustion gas is discharged outside the hothouse through the discharged gas passage 4. When the setting time of the timer elapses, the electromagnet 8 is excited, the changeover damper 7 rises through the lifting rod 9, and the gas completely burnt mixes with air from a blower 12 through the heated gas passage 5 and is supplied into the hothouse through a duct 11.</p> |
