Device for diagnosing clogging of lead pipe and method for diagnosing blockage
A diagnostic device and pressure guide tube technology, which is applied in the direction of measuring device, measuring fluid pressure, pressure difference measurement between multiple valves, etc., can solve the problem that it is difficult to display the measured value, cannot correctly measure process variables, and has a great influence on equipment And other issues
Inactive Publication Date: 2012-02-01
YAMATAKE HONEYWELL CO LTD
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Problems solved by technology
When the pressure guiding tube is completely blocked, the process and processing variables cannot be correctly measured, which has a great impact on the equipment
Also, the pressure is transmitted to the pressure signal generator before the impulse tube is completely blocked, so the effect of the blockage is difficult to show in the measured value of the process process variable
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[0093] principle of invention
[0094] Since the fluctuation phenomenon of pressure is a phenomenon of vibration, it is possible to detect information corresponding to the amplitude and frequency of the fluctuation. The techniques disclosed in Patent Document 1 and Patent Document 2 are conceptually techniques for detecting the amplitude of fluctuations.
[0095] The inventors studied the clogging phenomenon of the pressure guiding tube, and as a result, focused on the fact that the clogging state of the pressure guiding tube can also be diagnosed by detecting the frequency (fluctuation speed) of the pressure fluctuation conceptually. The method of counting the number of up and down movements of fluctuations within a certain period of time is a method of simply detecting information corresponding to the fluctuation speed.
[0096] Like the technology disclosed in Patent Document 1 and Patent Document 2, when detecting the amplitude of pressure fluctuations to diagnose the blo...
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The need for changing the threshold value used as the reference for diagnosis is reduced. A pressure transmitter detects the pressure of an object to be measured, such as liquid, slurry, or gas with fluctuation (variation) in pressure, via a lead pipe. A device for diagnosing clogging of a lead pipe comprises a number-of-vertical-movements detection unit (11) which divides the time series of a pressure value detected by the pressure transmitter into a plurality of sections and detects the number of vertical movements of the fluctuation on a section-by-section basis, a determination unit (12) which determines the clogged state in the lead pipe by comparing the number of vertical movements of the fluctuation with a predetermined threshold value, and a detection interval adjustment unit (14); which adjusts the interval of detection of the number of vertical movements of the fluctuation on the basis of the autocorrelation coefficient of the pressure value.
Description
technical field [0001] The present invention relates to a pressure measuring device for introducing measuring objects such as liquids, slurry, and gases with fluctuating pressures into a pressure signal generator through a pressure guiding tube and measuring the pressure of the measuring objects, especially relates to diagnosing the blockage of the blocked state of the pressure guiding tube Diagnostic device and blockage diagnostic method. Background technique [0002] Conventionally, pressure signal generators have been used in the process industry, for example, to detect process variables and control the process. Pressure signal generators are also called pressure transmitters. This pressure signal generator is a device that can measure process variables such as pressure, flow rate, liquid level, and specific gravity by measuring the pressure difference or absolute pressure between two points. Generally speaking, when a pressure signal generator is used to measure a proc...
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IPC IPC(8): G01L19/12G01L13/00G01L27/00
CPCG01L27/007G01L13/00G01L19/12G01L27/00
Inventor 田原铁也
Owner YAMATAKE HONEYWELL CO LTD