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Patent Searching and Data


Title:
FLOW RATE CONTROL DEVICE AND METHOD, AND CHILLER
Document Type and Number:
WIPO Patent Application WO/2021/256481
Kind Code:
A1
Abstract:
A flow rate control device according to one embodiment is provided with: a flowmeter that repeatedly generates a pulse signal according to the flow of a fluid discharged from a fluid machine being driven by a brushless motor or an AC motor and forms the pulse signal so that the pulse width of the pulse signal is inversely proportional to the flow rate of the fluid; a frequency-voltage conversion unit that subjects the pulse signal to frequency-voltage conversion to generate a voltage value which corresponds to the pulse signal; and a controller that changes the frequency of a drive input voltage for driving the brushless motor or the AC motor, according to the difference between a target flow rate which is set in advance and a converted flow rate of the fluid which is obtained by a conversion on the basis of the voltage value generated by the frequency-voltage conversion unit.

Inventors:
IKEGAMI TORU (JP)
Application Number:
PCT/JP2021/022786
Publication Date:
December 23, 2021
Filing Date:
June 16, 2021
Export Citation:
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Assignee:
SHINWA CONTROLS CO LTD (JP)
International Classes:
G05D7/06; F04B49/06; H02P6/08
Foreign References:
JP2016142216A2016-08-08
JP4569324B22010-10-27
JP2015184750A2015-10-22
JPH04284191A1992-10-08
Attorney, Agent or Firm:
NAKAMURA Yukitaka et al. (JP)
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