Patent ID: 7947173

Claim:
A seawater filter, comprising: a main body, which is hollow and has a first end surface and a second end surface, the first end surface, the second end surface, and the main body forming an accommodating space in the main body, the first end surface has at least one seawater inlet, a hollow duct is disposed at the center of the second end surface and extends into the accommodating space, the second end surface has at least one seawater outlet, the duct has at least one fresh water outlet for filtered fresh water to flow out of the main body, and a fresh water pipeline is connected to the duct and in fluid communications with the duct; a driving unit disposed on the outer side of the first end surface of the main body, wherein a rotating axis protrudes from the driving unit into the accommodating space of the main body, the rotating axis is provided with at least one pumping fan, at least one centrifugal fan, and at least one pressurizing fan, the at least one pumping fan draws and guides seawater to enter the accommodating space via the at least one seawater inlet, the at least one centrifugal fan throws out impurities whose densities are larger than seawater, the at least one pressurizing fan is disposed in the duct for processing fresh water to flow out via the fresh water pipeline, the maximum outer diameter of the at least one pumping fan and the at least one centrifugal fan is smaller than the inner diameter of the accommodating space of the main body and the space between the maximum outer diameter of the at least one pumping fan and the inner diameter of the accommodating space is defined as a dense seawater region, the dense water region enables dense water with a higher impurity concentration of impurities to flow from top to bottom and leave via the at least one seawater outlet, the minimum outer diameter of the at least one pumping fan and the at least one centrifugal fan is larger than the diameter of the duct, and the maximum outer diameter of the at least one pressurizing fan is smaller than the inner diameter of the duct; and a floating object, which is interposed between the main body and the driving unit for the driving unit to float on the water level, wherein the rotating axis penetrates through the floating object into the accommodating space.