Electromagnetic vortex street flowmeter for measuring flow of gas-containing conductive liquid

A technology of vortex flowmeter and conductive liquid, which is applied in the direction of measuring flow/mass flow, detecting the dynamic effect of fluid flow, volume/mass flow generated by mechanical effect, etc., and can solve the problem of not getting flow signal frequency and signal distortion , large measurement errors, etc.

Active Publication Date: 2018-02-13
CHONGQING CHUANYI AUTOMATION
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Problems solved by technology

Due to the interference of bubble noise, the signal is distorted. At this time, if the processing method of single-phase flow is still used, the correct flow signal frequency may not be obtained, r

Method used

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  • Electromagnetic vortex street flowmeter for measuring flow of gas-containing conductive liquid
  • Electromagnetic vortex street flowmeter for measuring flow of gas-containing conductive liquid
  • Electromagnetic vortex street flowmeter for measuring flow of gas-containing conductive liquid

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Embodiment Construction

[0021] Below in conjunction with accompanying drawing, the present invention will be further described.

[0022] figure 1 It is a schematic diagram of the structural composition of the primary instrument of the electromagnetic vortex flowmeter, which is mainly composed of a vortex generator, a permanent magnet, a lining, an electrode and a casing. The shape of the vortex generating body adopts the trapezoidal structure, that is, the structure used in ordinary vortex flowmeters, which is located outside the magnetic field and upstream of the magnetic field. Permanent magnets provide a stable magnetic field for the primary meter. The lining acts as an insulation to prevent the induced signal voltage from being short-circuited by the metal case. The electrode adopts the attached electrode used in the current ordinary electromagnetic flowmeter. The process is relatively mature and the structure is firmer. It is composed of a reference electrode and a working electrode. The refer...

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Abstract

The invention relates to an electromagnetic vortex street flowmeter for measuring flow of a gas-containing conductive liquid, comprising a hardware system and a software system. The hardware system iscomposed of a signal conditioning and acquiring module and a digital signal processing and control module, wherein the signal conditioning and acquiring module uses a two-stage alternating-current amplifier circuit and a DC-offset circuit to effectively extract a weak near-sinusoidal signal related to flow velocity, so that the requirements of a subsequent processing circuit are met. The digitalsignal processing and control module uses a DSP (digital signal processor) as a core. The software system is composed of a master monitor program, an initializing module, a watchdog module, an algorithm module, a human-machine interface module and an interruption module. The flow signal frequency is calculated by using a signal processing method based on signal differential and FFT (fast Fourier transform) spectral analysis, spectral center-of-gravity correction and medium filtering are also performed, and stable frequency output to reflect changes in the flow velocity is obtained.

Description

technical field [0001] The invention relates to the field of flow measurement, and is an electromagnetic vortex flowmeter, in particular an electromagnetic vortex flowmeter based on differential and fast Fourier transform for measuring the flow of gas-containing conductive liquid. Background technique [0002] The electromagnetic vortex flowmeter is a flow meter based on the principle of Karman vortex street and electromagnetic induction. It has many characteristics such as simple and reliable structure, small pressure loss and long service life. The electromagnetic vortex flowmeter uses electromagnetic methods to detect the frequency of the vortex. Compared with the vortex flowmeter, its output signal is not affected by the interference of pipeline vibration and surrounding vibration sources, and the measurement reliability is high; compared with the electromagnetic flowmeter , low signal processing difficulty, no zero drift. For the flow of single-phase conductive liquid,...

Claims

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Application Information

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IPC IPC(8): G01F1/32
CPCG01F1/3209G01F1/325
Inventor 徐科军汪春畅许伟吴建平梁利平熊伟闫小雪
Owner CHONGQING CHUANYI AUTOMATION
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