JPS5849218U

JPS5849218U - Karman vortex flowmeter

Info

Publication number: JPS5849218U
Application number: JP14463581U
Authority: JP
Inventors: 三分一　寛; 忠弘山本; 須合　雄孝; 太田　忠樹
Original assignee: 日産自動車株式会社
Priority date: 1981-09-29
Filing date: 1981-09-29
Publication date: 1983-04-02
Also published as: JPS6212256Y2

Abstract

(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Brief explanation of drawings]

第１図は従来装置の構成図、第２図はカルマン渦発生体
の構造図、第３図は比例関係にある領域での速度と渦の
周期、周波数を示すグラフ、第４図は本考案の実施例を
示す構成図、・第５図はそのタイムチャート図、第６図
は本考案の他の実施例　　　−を示す部分構成図、第７
図はそのタイムチャート図、第８図は同じく本考案の他
の実施例を示す部分構成図、第９図はそのフローチャー
ト図である。１・・・ダクト、２・・・渦発生体、５・・・熱線温度
制御回路、６・・・波形整形回路、８・・・エッヂコン
トローラ、９・・・カウンタ、１０・・・クロックパル
ス発生回路、１１・・・演算回路、１６・・・比較器、
１７・・・リミッタ設定回路、２０・・・エッヂパルス
発生回路、２２・・・ゲートコントローラ、２４・・・
エッヂパルスカウンタ、２５・・・リミッタ設定回路、
２６・・・比較器、２７−・・マイコン、２９・・・エ
ッヂコントローラ、３０・・・フリーライニングカウン
タ、３１・・・ＰＩＡ。３２・・・ＣＰＵ、３３・・・ＲＯＭ、３４・・・ＲＡ
Ｍ０第１薗第６図　　　　　　υFigure 1 is a configuration diagram of a conventional device, Figure 2 is a structural diagram of a Karman vortex generator, Figure 3 is a graph showing velocity, vortex period, and frequency in a proportional relationship region, and Figure 4 is a graph of the present invention. Fig. 5 is a time chart thereof, Fig. 6 is a partial block diagram showing another embodiment of the present invention, and Fig. 7 is a block diagram showing an embodiment of the present invention.
The figure is a time chart, FIG. 8 is a partial configuration diagram showing another embodiment of the present invention, and FIG. 9 is a flow chart thereof. DESCRIPTION OF SYMBOLS 1... Duct, 2... Vortex generator, 5... Hot wire temperature control circuit, 6... Waveform shaping circuit, 8... Edge controller, 9... Counter, 10... Clock pulse Generation circuit, 11... Arithmetic circuit, 16... Comparator,
17... Limiter setting circuit, 20... Edge pulse generation circuit, 22... Gate controller, 24...
Edge pulse counter, 25... limiter setting circuit,
26... Comparator, 27-... Microcomputer, 29... Edge controller, 30... Free lining counter, 31... PIA. 32...CPU, 33...ROM, 34...RA
M0 No. 1 Sono No. 6 υ

Claims

[Scope of utility model registration request]

In a Karman vortex type flow measurement device that places a vortex generator in the flow in a duct and calculates the flow rate by converting the period or frequency of the generated vortex into an electrical signal, the flow velocity and the generation period of the vortex are calculated. a means for determining a low flow velocity region where is not proportional;
means for outputting a signal with the highest period or lowest frequency in the proportional region, and calculates the flow rate based on the signal with the highest period or lowest frequency in the low flow velocity region in preference to the actual measured value. Karman vortex flowmeter.