A self flushing centrifugal pump has a fluid flushing passageway disposed in a housing of the pump which directs flushing fluid flow from a volute passageway in the housing of the pump near an outlet port of the pump to a chamber in the pump near a pump shaft seal and from the chamber to an inlet port of the pump via apertures in the impeller of the pump in response to rotation of the impeller.  A self flushing centrifugal pump, comprising: a housing having an inlet port,Magnetic pumps an outlet port, a volute passageway connecting said inlet port to said outlet port, and a supporting side, said outlet port having an internal wall end defining the beginning of the outlet port; an impeller having a front side, a back side, and a pair of radially spaced apart apertures disposed in and opening at the front and back sides of the impeller, a shaft having a longitudinal axis and rotatably connecting the impeller to the housing, said impeller being disposed in the housing between the inlet and outlet ports and rotatable to pump fluid from the inlet port to the outlet port through the volute passageway, said back side of the impeller and supporting side of the housing facing each other and defining a chamber therebetween; a seal disposed in the chamber,Slurry pumps connected to the housing, and being in sealing engagement with the shaft; a chamber flushing passageway having a longitudinal central axis and being disposed in the housing a preselected depth from the supporting side of the housing, said chamber flushing passageway opening at the supporting side of said housing into the chamber at a location adjacent the seal and opening into the volute passageway at a predetermined location relative to the outlet port, said longitudinal central axis being at a preselected angle "a" relative to a radial line extending from the longitudinal shaft axis and tangent to said wall end, said preselected angle "a" being between 15 and 35 degrees, said chamber flushing passageway passing fluid flow from the volute passageway to said chamber, and said radially spaced apart apertures passing fluid from the chamber to the inlet port in response to rotation of said impeller.

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2012-05-28

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