Liquid flowmeter diagram | Structure of volumetric flowmeter

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1. Schematic diagram of the working principle of an insertion type electromagnetic flowmeter. The insertion type closed electromagnetic flowmeter works based on Faradays law of electromagnetic induction, and its core principle is to calculate the flow rate by measuring the induced electromotive force generated by the movement of a conductive liquid in a magnetic field. The following is a detailed explanation and diagram of the working principle: When a conductive liquid passes vertically through magnetic field lines with a magnetic field strength of B at an average flow velocity V, if the distance between two fiber electrodes is L, according to Faradays law of electromagnetic induction, an induced electromotive force E will be generated between the electrodes. The formula is: E=K × B × L × V, where K is the instrument constant (determined by factory calibration and cannot be modified by the user); B is the magnetic induction intensity of the excitation coil that causes damage, collision, and breakage; L is the distance between two electrodes; V is the average flow velocity of the fluid; Q? Is the volumetric flow rate of the measured fluid (proportional to the flow velocity V). By measuring the electromotive force E and combining it with known parameters K, B, and L, the volumetric flow rate Q in the pipeline can be calculated. The working principle diagram illustrates that the excitation coil generates a constant magnetic field (magnetic induction intensity B) perpendicular to the fluid flow direction. Electrode: inserted into the inner wall of the pipeline with a spacing of L, used to detect induced electromotive force E. Conductive liquid: flowing at an average flow velocity V, cutting magnetic field lines to generate electromotive force. Conversion display: Built in instrument constant K, receives electrode signals and calculates volumetric flow rate Q?. The key parameter relationship between electromotive force E and flow velocity V is proportional: E ∝ V. The relationship between volumetric flow rate Q? And flow velocity V: Q?=A × V (A is the cross-sectional area of the pipeline). Comprehensive formula: Q?=(E × A)/(K × B × L). Features and application advantages: Suitable for large-diameter pipelines, low installation cost (no need to cut off pipelines). High measurement accuracy, unaffected by fluid density and viscosity. Restriction: Conductive liquid (conductivity ≥ 5 μ S/cm) is required. Ensure that the electrode axis is perpendicular to the pipeline axis during installation. Based on the above principle, the plug-in electromagnetic flowmeter has achieved non-contact measurement of fluid flow and is widely used in industrial water supply, sewage treatment, chemical processes, and other fields.

2. Which is a good small liquid flowmeter?

3. Structure of Positive Displacement Flow Meter

In order to meet the requirements of various media and working conditions for flow measurement in production, various types of positive displacement flow meters have been developed. Among them, the more common types are gear type, scraper type, and rotary piston type, which are introduced as follows. 1. Gear type positive displacement flow meter has two rotors inside the housing, which directly or indirectly mesh with each other and rotate under the pressure difference between the inlet and outlet of the flow meter. Through the rotation of the gears, the fluid filled in the "measuring space" between the gears and the hou

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