| 摘要 |
Centrifugal pump, in particular drain pump for washing machines, comprising a casing ( 10 ) that defines a chamber ( 11 ) within which an impeller formed by a hub ( 14 ) and a disk ( 15 ) provided with blades ( 16 ) is capable of rotating. The impeller is provided with at least a slit ( 20 ) adapted to generate a negative pressure on the rear surface of the disk ( 15 ) during the rotation of said impeller. The solution is very simple and rational; it enables a clogging of the impeller, as it may be caused by the presence of foreign matters and bodies in the washing liquor, to be avoided. It also enables axial thrusts, as they occur during the rotation of the impeller, to be compensated for.
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