The present invention provides a circulation system with dissolved oxygen. The circulation system comprises a cover body, which forms a gas chamber and stores oxygen and downwardly positioned into a water tank and fixed in the tank. An air outlet is formed in one side of the cover body for connection with an air delivery conduit and communication with the interior of the cover body. The bottom of the water tank forms a water outlet in connection with an end of a water delivery conduit, which has an opposite end connected to the air delivery conduit. The connection between the air delivery conduit and the water delivery conduit is connected to an output pipeline that is connected to the water tank corresponding to the gas chamber and having an end equipped with an inlet. The air delivery conduit is capable of withdrawing oxygen from the gas chamber to be mixed with the water withdrawn by the water delivery conduit from the water tank in order to forming dissolved oxygen, which is injected into the water tank through the output pipeline for circulating and supplying oxygen dissolved in the water, thereby maintaining a level of dissolved oxygen in the flowing water.本發明係有關於一種溶存氧量循環系統,其循環系統設有一存有氧氣具氣室之罩體由上往下置入於一水槽內並固定其槽中,於罩體一方處開設一出氣口以連接一輸氣導管與罩體內部相通,且於水槽之底方處開設一出水口與一輸水導管之一端接通,另一端與輸氣導管連接相通,並於輸氣導管及輸水導管之接連處連接一可相通至水槽中且末端具進給口之輸出管路與氣室相對應,令輸氣導管可抽取氣室內的氧與輸水導管抽出水槽中的水相容混合形成溶氧後,由輸出管路注入水槽內以供循環施予其水中之溶存氧量,達到保持流動活水之溶氧狀態。
