| 摘要 |
A friction regenerative pump of this invention comprises: a partition portion formed in a section from a high-pressure outlet to a low-pressure intake along an impeller rotation direction; and a tongue portion provided in the partition portion such that it is elastically deformable. The tongue portion receives a back pressure from high-pressure fluid on the side of the high-pressure outlet and is elastically deformed in a direction of reducing a gap formed between the tongue portion and the outer peripheral portion of an impeller. Consequently, leakage of the high-pressure fluid from the high-pressure outlet to the low-pressure intake is reduced, thereby improving pump efficiency.
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