a dissolved oxygen flotation device contains a power unit, a transmission unit, a base unit and a water vehicle leaf unit. The power unit includes a drive motor. The transmission unit include a transmission housing connected with the driving motor, a worm arranged in the transmission case, a worm wheel in the transmission case and a transmission shaft which is arranged in the transmission case. The shoulder of the worm arranged is provided with an upper bearing. The bottom of the worm arranged is provided with a lower bearing. The base unit includes a base having buoyancy. The drive unit is arranged on the base. The water wheel unit includes plural impeller which is connected to the transmission shaft. The upper bearing or the lower bearing uses an umbrella bearing which can support the forces generated when the plurality of impellers is tapping the water surface.一種增氧水車裝置,包含一動力單元、一傳動單元、一底座單元,及一葉輪單元。該動力單元包括一驅動馬達。該傳動單元包括一與該驅動馬達連接之傳動殼體、一設置於該傳動殼體之蝸杆、一設置於該傳動殼體之蝸輪,及一穿設於該傳動殼體之傳動軸,該蝸杆之肩部設有一上軸承,該蝸杆之底部設有一下軸承。該底座單元包括一具有浮力之底座,該傳動單元設置於該底座上。該葉輪單元包括複數連接該傳動軸之葉輪。該上軸承、該下軸承之其一或同時使用傘型軸承,用以撐抵該蝸杆推動該蝸輪及該複數葉輪拍打水面時所產生的作用力。3‧‧‧動力單元31‧‧‧驅動馬達311‧‧‧驅動軸5‧‧‧傳動單元51‧‧‧傳動殼體511‧‧‧加油口512‧‧‧卸油口513‧‧‧封口蓋514‧‧‧封口螺絲515‧‧‧透氣孔52‧‧‧蝸杆521‧‧‧上軸承522‧‧‧下軸承53‧‧‧蝸輪531‧‧‧轉動方向54‧‧‧傳動軸56‧‧‧軸承撐抵環
