| 摘要 |
<p>PURPOSE:To restore the oxygen concentration to a preset level in a short time in case of the lowering of the oxygen concentration of a gas atmosphere in a preservation chamber for a perishable good, by using a preservation chamber receiving carbon dioxide gas generated from a combustion furnace and circulating the air from the chamber to the combustion furnace, and providing a change-over valve connectable to outer atmosphere between the combustion furnace and the preservation chamber. CONSTITUTION:Carbon dioxide gas generated in a combustion furnace 12 is introduced into a preservation chamber 1 for perishable goods through adsorption apparatuses 22, 23 and the air in the preservation chamber 1 is circulated to the combustion furnace 12. In the preservation apparatus having the above structure, change-over valves 28, 29, 33, 38 are provided at the upstream and downstream sides of the adsorption apparatuses 22, 23 and between the preservation chamber 1 and the combustion furnace 12. When the oxygen concentration in the preservation chamber is decreased below an arbitrarily preset level, the gas in the preservation chamber is discharged through the change-over valves 28, 38 to outer atmosphere and air is introduced through the change-over valves 35, 29 to return the oxygen concentration to the arbitrary preset level within a short time.</p> |
