| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a pump structure capable of efficiently pressure-feeding fluid from a delivery port of a pump chamber. Ž<P>SOLUTION: The pump structure 10 is provided with an impeller 34 having a blade part 34A and an extension portion 34B, the pump chamber 24 housing the impeller 34 and disposed with a suction port 26 and the delivery port 28, and a second volute part 58 formed of an inner wall facing the blade part 34A and projecting than the inner wall of the pump chamber 24 facing the extension portion 34B in a radial direction. The fluid flowing in from the suction port 26 of the pump chamber 24 is delivered from the delivery port 28 by rotation of the impeller 34. As the second volute part 58 projecting from the inner wall of the pump chamber 24 is provided, a clearance between the inner wall of the pump chamber 24 and an end of the blade part 34A is small comparing to a structure in which an inside diameter of an inner wall is constant. Thus, pressure acted on the fluid is not readily relieved and the fluid can be efficiently pressure-fed from the delivery port 28. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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