CRITICAL FLOW NOZZLE TYPE GAS FLOWMETER AND ADJUSTMENT METHOD OF GAS FLOWMETER

Title:

CRITICAL FLOW NOZZLE TYPE GAS FLOWMETER AND ADJUSTMENT METHOD OF GAS FLOWMETER

Document Type and Number:

Japanese Patent JP2017181213

Kind Code:

A

Abstract:

PROBLEM TO BE SOLVED: To provide a gas flowmeter which can correct and price the measured value of a gas flow rate obtained by a gas flowmeter over a wide pressure range or a wide flow rate range.SOLUTION: A critical flow nozzle type gas flowmeter 1 according to the present invention includes a plurality of critical flow nozzles 4 and on-off valves 7 corresponding to the critical flow nozzles 4, at least two of the critical flow nozzles 4 having different throat diameters.SELECTED DRAWING: Figure 5

Inventors:

MORIOKA TOSHIHIRO
ITO MASARU
FUJIKAWA SEIICHI
INOUE GOICHI

Application Number:

JP2016066864A

Publication Date:

October 05, 2017

Filing Date:

March 29, 2016

Export Citation:

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Assignee:

IWATANI INT CORP
AIST

International Classes:

G01F25/00; G01F1/42

Domestic Patent References:

JPS6320027U	1988-02-09
JPS56117122A	1981-09-14
JP2011515660A	2011-05-19

Foreign References:

US5614655A

1997-03-25

Other References:

森岡敏博、伊藤優、藤川静一、石橋雅裕、中尾晨一: "高圧水素大流量の実流校正設備の構築とその評価", 日本機械学会論文集Ｂ編, vol. 79巻, 800号, JPN6019023008, 25 April 2013 (2013-04-25), JP, pages 533 - 540, ISSN: 0004058933
森岡敏博、中尾晨一、石橋雅裕: "高圧水素ガス計測用臨界ノズル式流量計の特性評価", 日本機械学会論文集（B編）, vol. 77巻,776号, JPN6019048669, 25 April 2011 (2011-04-25), JP, pages 1088 - 1097, ISSN: 0004173556
浅野裕、中尾晨一、八鍬武史: "低レイノルズ数における臨界ノズルの形状に関する研究", 日本機械学会論文集（B編）, vol. 77巻, 779号, JPN6019048670, 25 July 2011 (2011-07-25), JP, pages 1550 - 1556, ISSN: 0004173557

Attorney, Agent or Firm:

Makoto International Patent Office

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