Setting method of flow meter device and flow meter device

Patent metadata

Field	Value
Publication number	US-9683880-B2
Application number	US-201214367810-A
Country	US
Kind code	B2
Filing date	Dec 26, 2012
Priority date	Dec 26, 2011
Publication date	Jun 20, 2017
Grant date	Jun 20, 2017

Abstract

A setting method of a flow meter device comprises (A) measuring a compensation coefficient in a case where a fluid is flowed with a flow within a predetermined range, and deriving a first function representing as a linear function a relationship between a measurement compensation coefficient which is the measured compensation coefficient and a conversion value which is obtained by converting a set flow which is the flow of the flowed fluid, using a predetermined function; (B) setting a reference flow which is an arbitrary flow within the predetermined range and calculating a reference compensation coefficient which is a compensation coefficient corresponding to the reference flow based on the reference flow and the first function; and (C) storing the reference flow and the reference compensation coefficient corresponding to the reference flow.

First claim

The invention claimed is:

1. A flow meter device comprising:
a main fluid passage having a rectangular cross-section, through which a fluid flows;
a plurality of fluid passages provided by arranging a plurality of partition plates in a layer form such that the partition plates are spaced apart from each other in an interior of the main fluid passage;
a pair of ultrasonic transducers which are placed at an upstream side and a downstream side within a measurement fluid passage including a part or all of the plurality of fluid passages, respectively, and transmit and receive an ultrasonic wave;
a propagation time measurement unit for measuring a propagation time of the ultrasonic wave between the pair of ultrasonic transducers;
a storage unit storing a plurality of set flow values and a plurality of compensation coefficients corresponding to the set flow values, the compensation coefficients configured to be preset as to the set flow values such that the compensation coefficients are obtained after the set flow values are obtained;
a flow calculation unit for calculating an actual flow of the fluid flowing through the measurement fluid passage by adjusting a flow calculated based on a flow velocity derived from the propagation time measured by the propagation time measurement unit with a corresponding compensation coefficient; and
wherein the storage unit further contains a plurality of reference flow values and a plurality of reference compensation coefficients corresponding to the reference flow values, wherein the reference flow includes arbitrary flow values within a predetermined range;
wherein the flow calculation unit calculates the reference compensation coefficients in such a manner that a first function representing, as a linear function, a relationship between each compensation coefficient and a conversion value, is derived based on the set flow values and the compensation coefficients,
wherein the conversion value corresponds to a converted value of the set flow values using a predetermined function; and
the reference compensation coefficients are set based on the first function and the reference flow values.

2. A flow meter device comprising:
a main fluid passage having a rectangular cross-section, through which a fluid flows;
a plurality of fluid passages provided by arranging a plurality of partition plates in a layer form such that the partition plates are spaced apart from each other in an interior of the main fluid passage;
a pair of ultrasonic transducers which are placed at an upstream side and a downstream side within a measurement fluid passage including a part or all of the plurality of fluid passages, respectively, and transmit and receive an ultrasonic wave;
a propagation time measurement unit for measuring a propagation time of the ultrasonic wave between the pair of ultrasonic transducers;
a flow calculation unit for calculating a flow of the fluid flowing through the measurement fluid passage and comprising a microcomputer;
a storage unit that stores a plurality of set flow values and measurement compensation coefficients corresponding to the set flow values;
a predetermined program, when executed, causes the microcomputer to:
derive a first function representing as a linear function a relationship between a measurement compensation coefficient and a conversion value, wherein the conversion value is obtained by converting a set flow which is the flow of the flowed fluid, using a predetermined function;
set a reference flow which is an arbitrary flow within a predetermined range; and
calculate a reference compensation coefficient which is a compensation coefficient corresponding to the reference flow based on the reference flow and the first function;

wherein the storage unit further stores the reference flow and the reference compensation coefficient.

3. The flow meter device according to claim 2 , wherein the predetermined program, when executed, further causes the microcomputer to:
plot the set flow and the measurement compensation coefficient to derive an approximate curve;
set as the predetermined function a function in which the set flow is a parameter, of an arithmetic expression representing the derived approximate curve; and
determine the first function by setting the predetermined function in the arithmetic expression to a variable.

4. The flow meter device according to claim 3 , wherein the predetermined program, when executed, further causes the microcomputer to:
calculate a first flow which is a value obtained by converting the reference flow, based on the reference flow set and the predetermined function; and
calculate the reference compensation coefficient based on the first flow calculated and the first function.

5. The flow meter device according to claim 2 ,
wherein the predetermined function is a logarithm function.

6. The flow meter device according to claim 2 ,
wherein the reference flow includes more values than the measured set flow.

Assignees

• Panasonic Corp
• Panasonic Ip Man Co Ltd

Inventors

• Takemura Kouichi
• Watanabe Aoi
• Koba Yasuo
• Satou Masato

Classifications

• G01F25/0007

  Physics · mapped topic

• G01F1/667 Primary

  Arrangements of transducers for ultrasonic flowmeters; Circuits for operating ultrasonic flowmeters · CPC title

• G01F1/66 Primary

  by measuring frequency, phase shift or propagation time of electromagnetic or other waves, e.g. using ultrasonic flowmeters · CPC title

• G01F7/00

  Volume-flow measuring devices with two or more measuring ranges; Compound meters · CPC title

• G01F25/10

  of flowmeters · CPC title