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公开(公告)号:US11835047B2
公开(公告)日:2023-12-05
申请号:US17635082
申请日:2020-06-10
申请人: Ebara Corporation
发明人: Hiroyuki Kawasaki , Takayuki Miyamoto , Miwa Hidekura , Hoechun Kim , Satoshi Yamazaki , Xinshuai Fan
IPC分类号: F04D15/00 , F04D1/00 , F04D13/06 , F04D29/22 , F04D1/06 , F04B49/06 , F04B49/20 , F04D27/02 , F04D25/06
CPC分类号: F04D15/0066 , F04B49/065 , F04B49/20 , F04D1/00 , F04D1/06 , F04D13/06 , F04D15/00 , F04D25/06 , F04D27/0261 , F04D29/22
摘要: The present invention relates to a pump apparatus for delivering a liquid. The pump apparatus includes a pump (1) having an impeller (5), an electric motor (7) for rotating the impeller (5), and an inverter (10) for driving the electric motor (7) at variable speed. The impeller (5) has a non-limit load characteristic in a predetermined discharge flow-rate range (R). The inverter (10) is configured to drive the electric motor (7) at a preset target operating point (TO) with a rotation speed higher than a rotation speed corresponding to a power frequency of a commercial power source.