| 摘要 |
In a liquid pump, n sets of concavities are formed in an outer circumference of an impeller. In a case where an angle between an ith first line and an ith second line is a pitch angleθi and an ith difference of adjacent pitch angles isσi (σi=θi+1−θi) (the i may be any integer of 1 to n), the pitch anglesθi may be inhomogeneous. For each of the pitch anglesθi, there may be one or more other pitch angleθk (the k maybe any integer of 1 to n and other than i) being equal to the pitch angleθi. Formulas 0.05≰σ′/(average ofθ)≰0.30 and 0.15≰C′≰0.35 may be satisfied. |
