Method and apparatus for measuring the mass flow rate of a gas

A technology of mass flow rate and gas, applied in volume indication and recording equipment, measuring capacity, direct mass flow meter, etc., can solve problems such as high cost

Active Publication Date: 2013-09-25
AIR PROD & CHEM INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, both types of electronic flow instrumentation generally require extensive signal processing hardware and are generally high cost items

Method used

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  • Method and apparatus for measuring the mass flow rate of a gas
  • Method and apparatus for measuring the mass flow rate of a gas
  • Method and apparatus for measuring the mass flow rate of a gas

Examples

Experimental program
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Embodiment Construction

[0058] figure 1 A schematic diagram of a gas canister assembly 10 according to an embodiment of the present invention is shown. figure 1 A schematic diagram showing a situation in which the invention can be used. A gas tank 100, a regulator 150 and an instrument assembly 200 are provided.

[0059] The gas tank 100 has a gas tank body 102 and a valve 104 . The gas tank body 102 comprises a generally cylindrical pressure vessel having a flat base 102a arranged to enable the gas tank assembly 10 to stand freestanding on a flat surface.

[0060] The gas tank body 102 is formed from steel, aluminum, and / or composite material, and is adapted and arranged to withstand internal pressures of up to about 900 bar (gauge). Orifice 106 is located at the proximal end of gas canister body 102 opposite base 102a and includes threads (not shown) adapted to receive valve 104 .

[0061] Gas tank 100 defines a pressure vessel having an internal volume V. As shown in FIG. Any suitable fluid m...

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PUM

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Abstract

There is provided a meter (200; 350) for measuring the mass flow rate of a gas. The meter comprises a conduit (206) through which the gas flows in use. The conduit has a flow restriction orifice (212) through which choked flow occurs in use. The flow restriction orifice divides the conduit into an upstream portion (214) upstream of said orifice and a downstream portion (216) downstream of said orifice. The meter further comprises a sensor assembly (204), the sensor assembly including a piezoelectric crystal oscillator (218) in said upstream portion such that said piezoelectric oscillator is in contact with said gas when the meter in use. The sensor assembly is arranged: to drive the piezoelectric crystal oscillator such that the piezoelectric crystal oscillator resonates at a resonant frequency; to measure said resonant frequency of said piezoelectric crystal oscillator; and to determine, from the resonant frequency, the mass flow rate through the orifice.

Description

technical field [0001] The present invention relates to methods and devices for measuring the mass flow rate of gases. More particularly, the present invention relates to methods and apparatus for measuring the mass flow of gas through a restricted orifice using a piezoelectric oscillator. Background technique [0002] The methods and apparatus described herein are applicable to systems in which relatively high pressure (eg, about 10 bar or higher) fluids are present, such as, for example, fluid supplies in high pressure tanks or process equipment using high pressure fluids. In particular, the invention relates to "clean" gases, ie gases with little or no impurities or pollutants, such as water vapor or dust. [0003] The invention is particularly applicable to permanent gases. A permanent gas is a gas that is not liquefied by pressure alone, and, for example, a permanent gas can be used at pressures up to 450 bar (g) (bar g) (where bar (g) is a measure of pressure above a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01F15/06G01F1/78G01F15/04G01F15/12
CPCG01F1/76G01F1/78G01F15/043G01F15/063G01F15/125Y10T137/7759G01F15/04G01F15/06G01F15/12G01F1/86
Inventor N·A·道尼
Owner AIR PROD & CHEM INC
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