With the rapid development of modern measurement technology, various types of flow meters have emerged one after another, the measurement accuracy has been continuously improved, the scope of use has been expanded, and installation and maintenance have become increasingly simple. The LUGB vortex flowmeter introduced in this paper is widely used in the measurement of water, steam, and compressed air in industrial production due to its wide measurement range and high measurement accuracy. This article discusses the technical features and applications of such instruments from the aspects of instrument structure, working principle, and field applications.
1 Structure and working principle
As shown in Figure 1, the vortex flowmeter consists of a vortex generator (triangle column), a test head, a watch body, a connection pillar, and a detection amplifier.
Figure 1 Vortex flowmeter composition
The LUGB type vortex flow sensor is a kind of flow sensor designed and manufactured using Karmen vortex street principle and modern electronic technology. Applicable to the measurement of liquid, gas and steam flow in various industries, and can measure turbid liquid containing impurities and tiny particles.
When the fluid to be measured flows through the vortex generator, two columns of vortices are alternately generated on the two sides of the back of the generator to form a “vortex street†as shown in FIG. 2 . The frequency of this vortex is proportional to the velocity of the fluid, and it satisfies the following formula under certain conditions:
Where: f: frequency of vortices St: Strouhal number V: flow rate d: width of vortex generator
Fig. 2 Sketch of vortex street
The vortex generates alternating fluctuating pressure at the rear of the vortex generator body, which is converted into an electrical signal by a piezo-electric signal sensor and processed by the transmitter to be transformed into a pulse or standard signal output.
2 Technical Features
(1) Wide range of flow measurement, high measurement accuracy, and low pressure loss. The nominal diameter is DN10~DN500.
(2) Simple structure, no rotating parts, reliable work, good durability and long life.
(3) Measurement accuracy is not affected by fluid pressure, viscosity, and density. Widely used and industrial measurement, accuracy class 0.5.
(4) Strong resistance to environmental shocks. Measurable temperature up to +380 °C.
(5) Signal output current +-4~20mA, pulse signal, HART protocol, etc., use a wide range.
(6) Suitable for gases, liquids, steam and other media.
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