State determination device of liquid pumping apparatus, and liquid pumping apparatus
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United States of America Patent
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Sep 27, 2022
Grant Date -
Jul 16, 2020
app pub date -
Mar 23, 2020
filing date -
Sep 25, 2017
priority date (Note) -
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Abstract
A state determination device for a liquid pumping apparatus includes: a casing that forms a reservoir space; a feed valve that introduces working gas into the reservoir space; an exhaust valve that releases the working gas from the reservoir space; and a valve operating mechanism having a float arranged in the reservoir space, and performing a pumping stroke in which the liquid is pumped from the reservoir space under a pressure of the working gas and an inflow stroke in which the liquid flows into the reservoir space and the working gas is released. The state determination device further includes a pressure sensor that detects a pressure of the reservoir space, and a determination unit that determines whether the liquid pumping apparatus is in an operating state of performing the pumping stroke or the inflow stroke based on the pressure detected by the pressure sensor.
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