Liquid pump

The utility model provides a liquid pump can make the circulation of foreign matters such as wearing and tearing particle smooth and easy and prevent efficiency of pump reduction. Between the outer peripheral face (7a) of curb plate (7) of impeller (6) of the suction oral -lateral of circulation flow path (11) and the inner peripheral surface (5a) with pump shell (5) of this outer peripheral face (7a) opposition, be provided with trough of belt grommet (21) that have along axially extended groove (22), consequently, pass through to change the height of this trough of belt grommet, the internal diameter, groove depth etc, can adjust the outer peripheral face (7a) of curb plate (7) and the length and the size (width) in the clearance of the inner peripheral surface (5a) of pump shell (5) easily from this. Owing to can adjust the length and the size in above -mentioned clearance like this easily, therefore can freely adjust the volume of revealing of liquid and the circulation volume of foreign matter, consequen