Classification and working principle of positive displacement flow meter

Abstract: The classification and working principle information of positive displacement flowmeters are provided by excellent flowmeter and flowmeter manufacturers. As a mechanical flowmeter, the positive displacement flowmeter is characterized by no requirement for front and rear straight pipes and high measurement accuracy. It is widely used in the measurement of viscous media such as oil. 1. Double-rotor flowmeter is the main variety of positive displacement flowmeter, with various forms and specifications. More flowmeter manufacturers choose models and price quotations. You are welcome to inquire. The following is the classification and working principle of positive displacement flowmeters. As a mechanical flowmeter, the positive displacement flowmeter is characterized by no requirement for front and rear straight pipes and high measurement accuracy. It is widely used in the measurement of viscous media such as oil. 1. Double rotor flowmeter is the main variety of positive displacement flowmeter. 2. Oval gear flowmeter, its flow part is mainly composed of two intermeshing oval gears and their outer casing (measuring chamber). 3. Waist wheel volume flowmeter, waist wheel volume flowmeter is also called Roots type volume flowmeter. The working principle and working process of this flowmeter are basically the same as those of the oval gear type. It also relies on the pressure difference between the inlet and outlet fluids to generate movement, and discharges four parts per revolution.“Metering space”volume of fluid. The difference is that there are no teeth on the waist wheel, they are not directly meshed with each other to rotate, but are driven by a transmission gear set installed outside the casing. 4. Scraper type, the fluid pushes the scraper and the rotor to rotate, and the scraper extends and retracts radially along a special trajectory. The distance between the end faces of each two opposing scrapers is a certain value. When the scraper rotates continuously, a fixed measuring chamber is formed between the two adjacent scrapers, the rotor, the inner cavity of the casing and the upper and lower cover plates. One circle, the volume of four (or six) measuring chambers is discharged, that is, the circulation volume. According to the non-contact between the scraper and the cavity wall, it can be divided into two types: elastic scraper and rigid scraper. The front end of the elastic scraper is in elastic contact with the cavity wall. , It is suitable for measuring liquids containing impurities such as sand particles; the front end of the rigid scraper and the cavity wall maintain a fixed and extremely small gap, which is used for cleaning or liquids with fine powder impurities. The structure of rigid scraper can be divided into groove type (British Avery Hardoll type) and cam type (American Smith type). 5. Rotary piston type. Insert the annular piston into the shell of the two-layer cylindrical cylinder to form a form in which the annular piston rotates in the shell with the flow of the liquid. The diameter of the flowmeter is DN20~100mm, and the measurement accuracy is 0.5%R. Can be used for oil and food measurement. 6 reciprocating piston type. Driven by fluid, the piston reciprocates in the cylinder to measure the volume flow. Usually, the fuel dispenser in the gas station is this type. The flow rate is 60L/min, and the measurement accuracy is±(0.15~0.3)%R. 6. Disc type. Also known as Nutating Flowmeter, the disc with the center ball rotates and oscillates up and down in the metering chamber, enters and discharges the liquid. Compared with other PDFs, the accuracy is poor and the viscosity is more affected. big. Our country has produced to measure petroleum products, but it is less used. In North America, it is mostly used for household water meters and industrial water meters. 7. The drum type, also known as the wet gas meter, is used to measure the total amount of gas. The casing of the flowmeter contains about half of the sealing liquid (water or oil), half of the drum is immersed in the sealing liquid, and the gas flows in to make it rotate, and its sealing form is no leakage. The wide range is 20:1, the performance is stable, and high accuracy can be obtained under careful operation.±(0.2~0.5)%R, mostly used in the laboratory, often used as a table or standard table for the transfer of values. There are so many positive displacement flowmeters, each with its own advantages used in the measurement of different media. Common positive displacement flowmeters are oval gear flowmeters, dual rotor flowmeters, waist wheel flowmeters and scraper flowmeters. However, the volumetric flowmeter is more expensive than the general electronic meter, especially the large diameter is many times more expensive. The above is the whole content of this article. You are welcome to inquire about the flowmeter selection and quotation of our factory. 'Classification and working principle of positive displacement flow meter'
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