Patent ID: 7144504

Claim:
A compact water filter comprising: a housing comprising bottom container having a top, a top cavity defined in the top and a water inlet communicated with the top cavity; a pump casing mounted on the top of the bottom container and comprising a volute mounted on the top of the bottom container to cover the top cavity and having a top; and a top casing protruding from the top of the volute and having a top driver chamber, a bottom impeller chamber isolated from the top driver chamber and a water discharge port communicating with the bottom impeller chamber; a cap attached to the top casing to cover and close the top driver chamber; and a packing ring mounted around the top of the bottom container to fasten the bottom container to the volute of the pump casing; a filter mounted and held in the top cavity of the bottom container and having a top and an axial hole; and a water pump mounted in the pump casing of the housing and comprising a driver mounted in the top driver chamber and having two driver field windings mounted in the top driver chamber around the bottom impeller chamber; an impeller holder attached to the top of the filter and having a volute inlet communicating with the axial hole in the filter; and an impeller rotatably mounted in the bottom impeller chamber and comprising a vertical shaft with a bottom end rotatably mounted in the bottom impeller chamber and multiple vanes, the bottom end of the vertical shaft extended into and held in the volute inlet, and the vanes attached to the bottom end of the vertical shaft to pump water into the water discharge port from the volute inlet as the vertical shaft rotates.