| 摘要 |
A reversibly operated dual impeller pump which simultaneously pumps and filters wash liquid. The pump includes upper and lower assemblies. The upper assembly defines a recirculation impeller chamber and a filter chamber which are separated by a cylindrical wall. A recirculation impeller housed within the recirculation impeller chamber pumps wash liquid, a majority of the pumped wash liquid being directed toward one or more wash rotatably mounted arms while a portion of the pumped wash liquid is supplied to the filtration chamber via a hole in the cylindrical wall. A novel vane structure is provided to direct the pumped wash liquid from the recirculation impeller to the wash arm. The lower assembly includes a lower pump housing, a separator plate, and a macerator assembly. The macerator assembly includes a vertical cylindrical wall which spaces the macerator blade from a bottom of the lower pump housing to prevent damaging contact between heavy or settled material and the blade. The macerator assembly also includes a drain impeller which, when the pump is operated in a recirculation mode, pumps wash liquid to the filtration chamber and, when the pump is operated in the drain mode, pumps wash liquid and soil from the sump and filtration chamber to drain.
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