Diagnosis method based on rotation inertia

Abstract

The invention relates to a diagnosis method of a flowmeter based on turbine rotation inertia, and particularly discloses a diagnosis method based on rotation inertia. The diagnosis method comprises aflowmeter body, and comprises the following steps of: (1) establishing a pulse-time coordinate curve database of the flowmeter during interruption of air supply when the flowmeter leaves a factory; (2) detecting the rotation frequency of an impeller, and outputting a pulse signal Q; (3) detecting the rotation time of the impeller, and outputting a time signal t; (4) periodically uploading data acquired in the step (2) and the step (3) to a central processing unit, and drawing a real-time characteristic curve; and (5) intercepting a section of curve of the pulse signal Qi to 0 during interruption of air supply in the step (4), and comparing the section of curve with the characteristic curve in the step (1).

Description

technical field [0001] The invention relates to a diagnosis method of a flowmeter based on the rotational inertia of a turbine. Background technique [0002] At present, the gas turbine flowmeter is an impeller-type multi-blade fluid flow meter, which is a kind of flow meter used to measure the fluid flow and the total amount of fluid in the energy transmission environment and energy user terminals. The gas turbine flowmeter is a flowmeter that is measured by the rotation of the impeller. Its working principle is: the rotational angular velocity of the impeller placed in the fluid is proportional to the fluid flow velocity under the working conditions. By measuring the angular velocity of the impeller, the fluid flow velocity can be obtained, thereby obtaining Flow value in the pipe. [0003] When the user stops using natural gas, the impeller will continue to rotate under the action of inertia. During the process of the impeller from having a rotating speed to stopping, a ...

AI Technical Summary

Problems solved by technology

[0003] When the user stops using natural gas, the impeller will continue to rotate under the action of inertia. During the process of the impeller from having a rotating speed to stopping, a coordinate line of time t and pulse frequency Q can be obtained. The flowmeter is used for a long time Finally, there may be old or damaged bearings that cause increased friction and affect the pulse frequency, or damage to the impeller will also affect the pulse frequency

ultimately affect the accuracy of the flowmeter

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