Two volute pumps

The utility model provides a two volute pumps, its characteristics lie in that the exit end of baffle is located from the anemostat mid section to the within range the spiral case horizontal cross -section. The utility model discloses an optimizing the position of baffle exit end in the spiral case, in effective balanced impeller radial force, having improved two volute pumps's characteristic curve, the lower -capacity point lift reduces to some extent promptly, the large -capacity point lift improves to some extent, makes characteristic curve become comparatively mild by precipitous, has improved hydraulic efficiency. The utility model discloses a preferred scheme has still further increaseed baffle outer flow channel flow section area, not only makes two volute pumps's characteristic curve milder, has still reduced the casting degree of difficulty of spiral case, is favorable to improving flow surface's casting quality, further improves hydraulic efficiency, and this advantage is especially outstanding to t