Principle and installation requirements of Venturi tube flow meter

Abstract: The principle and installation requirements of Venturi tube flowmeter are provided by excellent flowmeter and flowmeter manufacturers. The principle of the Venturi flowmeter is that when the wind blows over the block, the air pressure is relatively low near the port above the leeward side of the block, which produces adsorption and causes the flow of air. The principle of the venturi is actually very simple, it is to change the airflow from coarse to coarse. For more flowmeter manufacturers to select models and price quotations, you are welcome to inquire. The following is the details of the article on the principle and installation requirements of Venturi tube flowmeters. The principle of the Venturi flowmeter is that when the wind blows over the block, the air pressure is relatively low near the port above the leeward side of the block, which produces adsorption and causes the flow of air. The principle of the venturi is actually very simple. It is to change the air flow from thick to thin to speed up the gas flow rate, so that the gas forms a gas on the back side of the venturi outlet.“vacuum”Area. When this vacuum zone is close to the workpiece, it will have a certain adsorption effect on the workpiece. The compressed air enters from the inlet A of the venturi, and a small part is discharged through the nozzle B with a small cross-section. As the cross section gradually decreases, the pressure of the compressed air increases, and the flow velocity also increases. At this time, a vacuum is generated in the inlet of the D adsorption chamber, causing the surrounding air to be sucked into the venturi, and the compressed air flows into the diffusion chamber to increase the flow rate of the gas, and then reduce the airflow vibration through the muffler device. The vacuum generator is a new type of high-efficiency, clean, economical, and small vacuum component that uses a positive pressure air source to generate negative pressure. It becomes very easy and convenient to obtain negative pressure in places. Vacuum generators are widely used in industrial automation in the fields of machinery, electronics, packaging, printing, plastics and robots. The traditional use of vacuum generators is to cooperate with suction cups for adsorption and handling of various materials, especially suitable for adsorption of fragile, soft, thin non-ferrous, non-metallic materials or spherical objects. In this type of application, a common feature is that the required pumping volume is small, the vacuum degree is not high, and the work is intermittent. When the upstream installation conditions are limited and cannot meet the above requirements, special tests are recommended to understand the influence of installation conditions on the uncertainty of flow measurement, and/or the influence of installation conditions on the first verification to determine the outflow coefficient Cd,. This standard gives the p>o. Correction method for calculating mass flow under 25 conditions. 2. Upstream large space If the distance from the primary device axis or the primary device population plane, see JJG 620-2008 [this section“Structure type”Medium 1. Flared throat venturi nozzle described in (1), or see 2. Cylindrical throat critical flow Venturi nozzle] there is no pipe wall within 5d, it can be considered that the upstream of the primary device is a large space. In the case of large upstream space or for large flow, multiple J critical flow venturi nozzles can be used. 3. Downstream Requirements There are no other requirements for the outlet piping except that it should not prevent the critical flow venturi nozzle from reaching critical flow. 4. Drain Holes Pipes can be equipped with necessary drain holes to drain condensation or other impurities that may collect in certain applications. When measuring flow, no fluid should pass through these drain holes. If drain holes are required, they should be located upstream of the pressure tap in the pipe wall upstream of the nozzle. The diameter of the discharge hole should be less than o. 06D. The axial distance from the drain hole to the plane of the upstream pipe wall pressure taking port should be greater than D, and the drain hole should be set on another axial plane different from the axial plane of the pipe wall pressure port. When measuring, the flow upstream and throat should be single-phase and non-condensing, and all internal surfaces must be kept clean to maintain their surface finish. The above is the whole content of this article. You are welcome to inquire about the flowmeter selection and quotation of our factory. 'Venturi Tube Flow Meter Principle and Installation Requirements'

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