Pump apparatus
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United States of America Patent
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Dec 5, 2023
Grant Date -
Sep 15, 2022
app pub date -
Jun 10, 2020
filing date -
Aug 28, 2019
priority date (Note) -
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status (Latency Note)
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Abstract
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.
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