Hyundam Industrial Co., Ltd.

Murase Seiji

Jin-Wook Jang

Kyoung-Yong Lee

Yong-Taek Hwang

Young-seok Choi

Uk-Hee Jeong

A random pitch impeller for a fuel pump has number of blades. An incremental angle of the blades is set by the expression: where &#x394;&#x3b8;I is the incremental angle between the blades, N is the total number of blades (N=2, 3, 5, 7, 11, 13, 17, . . . ), Am is the distribution magnitude of the inter-blade interval (equally divided angle) (0&#x3c;Am&#x3c;360/N), i is the order of the blade (i=1, 2, 3, . . . , N), and Pand Pare the factors exerting an influence on the cycle (0&#x3c;P&#x3c;N, and 0&#x2266;P&#x2266;N). The incremental angle has maximum and minimum values a difference of which satisfies the expression: 2&#xb0;&#x2266;MAX&#x2212;MIN&#x2266;6&#xb0;, where MAX is the maximum value, and MIN is the minimum value of the incremental angle.

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Chita-gun, Japan

Murase Seiji