Structure and Measurement Principle of Internal Venturi Flow Meter

Abstract: The information on the structure and measurement principle of the inner venturi tube flowmeter is provided by the excellent flowmeter and flowmeter manufacturers. 1. Introduction Differential pressure flowmeter, as a traditional measurement method, has a history of nearly 100 years of development, and today it is still the most widely used industrial online flow measurement instrument. The throttling parts used in differential pressure flow meters are mainly standard orifice plates, nozzles and venturis. For more flowmeter manufacturers to select models and price quotations, you are welcome to inquire. The following is the details of the structure and measurement principle of the internal venturi tube flowmeter. 1. Introduction Differential pressure flowmeter, as a traditional measurement method, has a history of nearly 100 years of development, and today it is still the most widely used industrial online flow measurement instrument. The throttling parts used in differential pressure flowmeters are mainly standard orifice plates, nozzles and Venturi tubes [1]. In view of the various defects in the technical performance of these throttling parts, in order to meet the needs of actual industrial measurement, people have successively invented several modified throttling parts based on orifice plates and nozzles, such as annular orifice plates, conical inlet holes Plate, quarter round orifice plate (nozzle), wear-resistant orifice plate [2], wedge flowmeter and V-Cone cone flowmeter, etc. These modified throttling parts can make up for some deficiencies in the technical performance of standard throttling parts under certain measurement conditions, but they have great limitations in use and low measurement accuracy. A modified throttle with relatively good performance, but due to“sharp edge abrasion”The resulting instability of the outflow coefficient has not been completely resolved. The inner venturi tube is a special-shaped venturi tube which has been modified from the traditional venturi tube. It integrates the advantages of annular orifice plate, wear-resistant orifice plate and venturi tube, and its technical performance is superior to that of orifice plate, nozzle and classic Venturi tube. The Venturi tube is also superior to other existing throttling parts. The inner venturi flowmeter is a new generation of differential pressure flow measuring instrument with unique performance, which has achieved good results in industrial measurement trials. 2. Structure and Measurement Principle 2.1 The inner Venturi tube is composed of a circular measuring tube 1 and a special-shaped core 2 placed in the measuring tube. The special-shaped core is a rotating body coaxial with the measuring tube, and its busbar is the axial section of the tube wall of a classical truncated Venturi tube with an imaginary tube wall of infinite thinness, that is, the radial outer surface of the rotating body is formed by the front section of the cone. The surface 6, the cylindrical surface 7 of the middle section, and the conical surface 8 of the tail section are composed of three parts. The special-shaped core is positioned by its supporting shafts 9 and 10 and the supporting rings 3 and 4 coaxial with the measuring tube, and is pressed and fixed by the brake (small diameter product, no front supporting shaft, only the rear shaft is supported by the rear ring positioning fixed). The support ring is composed of a coaxial inner ring, an outer ring, and 3-4 support ribs that connect the inner and outer rings into one. There is a pressure-taking joint 5 (or a remote flange pressure-taking interface) at a specific position on the pipe wall of the measuring pipe, and both ends of the measuring pipe are standard flanges used to connect with the field process pipeline. 2.2 As far as the basic measurement principle is concerned, the measurement principle of the inner Venturi tube and the traditional differential pressure flow meter such as the classic Venturi tube are exactly the same, and they are all based on the law of conservation of energy.——For the flow measurement method based on Bernoulli equation and flow continuity equation, the basic direct measurement is still the differential pressure before and after the throttle. As shown above, a different diameter annular cavity (annular gap) is formed between the outer surface of the special core and the inner surface of the measuring tube. The change rule of the flow surface of the annular cavity along the axial direction is similar to that of the classical Venturi tube, which makes the fluid flow through the inner surface. The flow change and the throttling process of the Venturi tube are basically the same as the flow change and the throttling process when the fluid flows through the classical Venturi tube. The above is the whole content of this article. You are welcome to inquire about the flowmeter selection and quotation of our factory. 'Structure and Measurement Principle of Inner Venturi Flow Meter'

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