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Flow measurer

A flow measuring device and flow technology, applied in the direction of measuring device, measuring flow/mass flow, liquid/fluid solid measurement, etc.

Inactive Publication Date: 2006-01-18
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Conventional systems do not set conditions based on gas type

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0046] figure 2 The structure of the gas type identification system according to Example 1 of the present invention is shown. Such as figure 2As shown, the gas type identification system includes a flow path 7 , an ultrasonic measurement section 8 disposed in the flow path 7 , and a calculation section 9 for performing arithmetic operations on signals output from the ultrasonic measurement section 8 .

[0047] The calculation section 9 includes a sound velocity calculation section 10 , a comparison section 11 , a sound velocity storage section 12 , a flow calculation section 13 and a flow compensation coefficient setting section 14 .

[0048] Next, the operation and function of the gas type identification system will be described.

[0049] The sound velocity calculation section 10 calculates the sound velocity from the signal output from the ultrasonic measurement section 8 . The comparison section 11 compares the sound velocity calculated by the sound velocity calculatio...

example 2

[0082] Figure 7 The structure of the gas type identification system according to Example 2 of the present invention is shown.

[0083] Such as Figure 7 As shown, the gas type identification system includes a flow path 7, an ultrasonic measurement part 8 arranged in the flow path 7, and a calculation part 9 for performing arithmetic operations on signals output from the ultrasonic measurement part 8, arranged in the A dual mode valve 32 in the flow path 7, and a control section 33 for controlling the dual mode valve 32. The dual mode valve 32 is arranged downstream of the ultrasonic measuring portion 8 in the flow path 7 .

[0084] Apart from figure 2 In addition to the structure shown in , the calculating section 9 also includes an abnormality determining section 34 . The abnormality determination section 34 determines whether an abnormal gas is flowing through the flow path 7 . For example, if the type of gas expected to flow through the flow path 7 (i.e., gas type A)...

example 3

[0096] Figure 9 The structure of the gas type identification system according to Example 3 of the present invention is shown.

[0097] Such as Figure 9 As shown, the gas type identification system includes a flow path 7, an ultrasonic measurement part 8 arranged in the flow path 7, and a calculation part 9 for performing arithmetic operations on signals output from the ultrasonic measurement part 8, arranged in the A dual mode valve 32 in the flow path 7, and a control section 33 for controlling the dual mode valve 32. The dual mode valve 32 is arranged downstream of the ultrasonic measuring portion 8 in the flow path 7 .

[0098] Apart from figure 2 In addition to the structure shown in , the calculating section 9 also includes a security standard setting section 43 and an abnormality determining section 44 .

[0099] In Example 3, the same constituent elements as in Example 1 are denoted by the same reference numerals, and their descriptions are omitted.

[0100] F...

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PUM

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Abstract

A flow measuring device includes: a flow pathway; an ultrasonic measuring part which is arranged in the flow pathway and includes a pair of ultrasonic transducers; a flow calculating part which is used for calculating the flow of gas that flows through the flow pathway according to one signal from the ultrasonic measuring part; a sound velocity calculating part which is used for calculating the sound velocity of the gas that flows through the flow pathway according to one signal from the ultrasonic measuring part; a sound storing part which is used for storing the predetermined sound velocity in advance; a comparison part which is used for comparing the sound velocity that is calculated by the sound velocity calculating part with the predetermined sound velocity that is stored in the sound storing part in advance. The temperature of the gas is derived according to the sound velocity of the gas which is calculated by the sound velocity calculating part. And according to the derived temperature, the flow of the gas calculated by the flow calculating part is compensated.

Description

[0001] This application is a divisional application with application number 99810813.8 submitted on September 10, 1999. technical field [0002] The present invention relates to a gas type identification system for identifying the type of gas flowing in a flow path and automatically setting conditions suitable for the gas type. Background technique [0003] In general, several methods are known that utilize the sound velocity of gas in a flow measuring device for diagnosing a malfunction of a flow meter. Such a method is described, for example, in Japanese Patent Application No. 8-304135. [0004] figure 1 The structure of a flow measuring device described in Japanese Patent Application No. 8-304135 is shown. [0005] Such as figure 1 As shown, the flow measurement device includes an ultrasonic measurement part 1 , a sound velocity calculation part 2 , a sound velocity setting part 3 , a temperature measurement part 4 , a sound velocity calculation part 5 and a comparison...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01F1/66G01N29/02G01N29/024G01N29/22G01N29/32
CPCG01N2291/102G01N2291/02836G01N29/326G01N29/024G01N2291/011G01N29/222G01N2291/02881G01N2291/0215G01N29/036
Inventor 名和基之长冈行夫难波三男
Owner PANASONIC CORP
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