Flow rate measurement apparatus
AssigneeMatsushita Electric Co., Ltd.
InventorsFumikazu Shiba, Yuji Nakabayashi
Life of this patent
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Abstract
A flow rate measurement apparatus includes: a plurality of flow paths 13 provided between an inflow port 11 and an outflow port 12; opening/closing sections 14 for opening/closing the plurality of flow paths 13; measurement sections 15 for measuring a flow rate of fluid flowing through at least one of the plurality of flow paths 13; and a control section 17 for controlling the opening/closing sections 14 and the measurement sections 15; The control section 17 includes a gain adjustment section 16 for correcting a gain of the measurement section 15 in a flow path which is closed by the opening/closing section 14.
Claims23
A flow rate measurement apparatus, comprising:
- a plurality of flow paths provided between an inflow port and an outflow port;
- opening/closing sections for opening/closing each of the plurality of flow paths;
- measurement sections for a measuring of flow rate of fluid flowing through each one of the plurality of flow paths;
- and
- a control section for controlling the opening/closing sections and the measurement section;
- wherein the control section includes:
- a section for switching a flow path so as to be closed by the opening/closing section;
- and
- a gain adjustment section for correcting a gain of the measurement section in a flow path which is closed by the opening/closing section.
A flow rate measurement apparatus, comprising:
- a plurality of flow paths provided between an inflow port and an outflow port;
- a plurality of opening/closing sections for opening/closing each of the plurality of flow paths;
- measurement sections for measuring a flow rate of fluid flowing through each of the plurality of flow paths;
- and
- a control section for controlling the opening/closing sections and the measurement sections;
- wherein the control section includes:
- a section for switching a flow path so as to be closed by the opening/closing section;
- and a zero-point examination section for detecting and correcting a zero-point of the measurement section in a flow path which is closed by the opening/closing section.
A flow rate measurement apparatus, comprising:
- a plurality of flow paths provided between an inflow port and an outflow port;
- opening/closing sections for opening/closing at least one of the plurality of flow paths;
- measurement sections for measuring a flow rate of fluid flowing through the plurality of flow paths;
- and
- a control section for controlling the opening/closing sections and the measurement sections;
- wherein the control section includes at least one of:
- a zero-point examination section for detecting and correcting a zero-point of the measurement section in a flow path which is closed by the opening/closing section;
- a gain adjustment section for correcting a gain of the measurement section in a flow path which is closed by the opening/closing section;
- and a total flow rate measurement section for measuring a total flow rate of fluid flowing from the inflow port to the outflow port, and
- the measurement section includes:
- a first transducer and a second transducer which transmit and receive an ultrasonic wave signal;
- a transmission section for transmitting a periodic drive signal to the first transducer and the second transducer;
- an amplifying section for amplifying the received ultrasonic wave signal;
- a comparison section for comparing a signal output from the amplifying section with a reference signal;
- a repetition section for repeating ultrasonic wave transmission a plurality of times between the first transducer and the second transducer according to an output of the comparison section;
- a delay section for delaying the ultrasonic wave signal by a predetermined time during the repetition of the ultrasonic wave transmission;
- and
- a flow rate calculation section for calculating a flow rate based on a propagation time of the ultrasonic wave signal between the first transducer and the second transducer.
Dependencies are inferred from the claim text.