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U/trasonic vortex flowmeter having clamp-on housing

A flowmeter and eddy current technology, applied in the improvement field of liquid flowmeter, can solve the problem of destroying the quality of the production process

Inactive Publication Date: 2004-02-11
阿萨希美国有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, removing the flowmeter from the pipeline will allow external contaminants to enter the pipeline, thus, further disrupting the production process or potentially sacrificing the quality of the product produced

Method used

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  • U/trasonic vortex flowmeter having clamp-on housing
  • U/trasonic vortex flowmeter having clamp-on housing
  • U/trasonic vortex flowmeter having clamp-on housing

Examples

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Embodiment Construction

[0021] Referring to Figures 1-4, there is shown an ultrasonic vortex flowmeter 10 according to the present invention having a flowmeter housing 12 formed by a metering head 14 pivotally mounted on a slidingly mounted fork 16 . The fork 16 is arranged to slide over a separate bluff body-containing line connector 18 and is held in place by a locking profiled pin 20 . In addition, a pair of rubber bushes 21 are respectively placed in cavities 23 and 25 formed on opposite sides of the inner side of the fork 16 and made to protrude slightly outward from the inner surface of the fork so that once the fork As member 16 slides, a friction fit is formed between fork member 16 and the bluff body-containing tubing connector 18 .

[0022] During initial installation, the line connector 18 containing the bluff body is fitted to the liquid line or pipeline, after which the flow liquid to be detected enters a flow channel 24 containing the bluff body through the first open end 22 , and fina...

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PUM

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Abstract

An improved ultrasonic vortex fluid flowmeter (10) includes a housing (12) having a slip-on yoke (16) which removably mates with a bluff body conduit connector (18) permanently installed in a fluid conduit to be monitored. An ultrasonic transmitter (40) and receiver (42) are respectively positioned within the legs of the yoke so as pass an ultrasonic wave through vortices (43) shed by the fluid as it flows by the bluff body (28). The slip-on yoke eliminates both the need to shut down fluid flow during meter servicing, and the potential for external contaminants entering the fluid. The flowmeter further utilizes a simple phase detector formed from an Exclusive Or gate (44) in combination with an optimal phase range detecting means (108). The optimal phase range detecting means triggers a 90 degree phase shift whenever the phase difference between the transmitted wave and the received wave approaches 0 or 180 degrees.

Description

technical field [0001] This invention relates to improvements in liquid flow meters, and more particularly to vortex flow meters of the type incorporating a bluff body in the liquid flow line and utilizing ultrasonic sensing circuits. Background technique [0002] Ultrasonic vortex flowmeters are well known and operate on the principle that an obstacle, such as a bluff body, placed in a liquid flowing in a straight line generates a number of vortices flowing downwards on the downstream side of the obstacle. These eddies cause local oscillatory changes in observable flow parameters such as pressure or flow rate. When the transmitted ultrasonic wave propagates through the eddy current, the eddy current causes a phase difference between the transmitted wave and the received wave, which depends on the strength of the eddy current and the flow velocity. These phase differences are then detected and used to calculate the flow rate of the liquid. [0003] However, the phase diffe...

Claims

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Application Information

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IPC IPC(8): G01F1/66G01F1/32
CPCG01F1/3281G01F1/3282G01F15/18G01F23/80
Inventor D·W·马希L·O·罗斯恩E·J·罗斯恩
Owner 阿萨希美国有限公司
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