Importance

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Abstract

An electric water pump rotating in the correct direction, comprising a water pump body (2) that has a chamber (3), which is basically cylindrical in shape, and a chamber cover (8), which is fitted at the axial outward end of said chamber (3); an impeller (42) is accommodated and rotates inside said chamber (3) coaxially; said impeller (42) includes at least two impeller vanes (45) that project from the impeller disc surface (44) and said impeller vanes (45) bend to the same direction around the rotating axis OO' of said disc surface (44); Assuming V as the volume inside said chamber (3) and v as the volume enveloped by all the said impeller vanes (45) when said impeller (42) rotates, a design can be made about relations of geometrical parameters between volume of said chamber (3) in said electric water pump and said volume enveloped by all the impeller vane (45) rotating inside said chamber (3) to be in the following range, i.e., ratio between volume enveloped by all the said impeller vane (45) in rotation and volume of said chamber (3):v/V=0.08.about.0.18,then said impeller (42) will rotate in the direction against that of all the impeller vane (45) bend to, and liquid resistance will be less and water output higher at this time. The said electric water pump has a correct design in relations of geometrical parameters between the volume of said chamber (3) and the volume of said impeller (42) rotating inside said chamber (3), thus making it possible to install the single-phase synchronous or asynchronous motors, which are simple in structure and low in cost, to drive said water pumps while ensuring correct rotating direction each time when said water pumps are started with high output.

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First Claim