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Cone flowmeter

『Cone flowmeter』Related information(clamp on meter|electromagnetic meter|venturi meterrotameter|orifice meter|ultrasonic flow meter|mass flow meter|coriolis mass flow meter|coriolis flow meter|magnetic flow meter|magmeter flow meter|magflow flow meter|mag meter flow meter|electromagnetic flow meter|vortex flow meter|turbine flow meter|thermal mass flow meter|thermal flow meter|rotameter flow meter)

1. It is not certain whether the rotor of the rotor flowmeter has a taper

. As long as one of the rotor or outer tube has a taper, it can form a rotor flowmeter. A rotor flowmeter that relies on the taper of the rotor to operate has a circular orifice plate in the outer tube, and the rotor only moves in the circular hole of the orifice plate during operation. By relying on the taper of the outer tube to operate the rotary flow meter, the rotor lead rod can be a spherical shape, or a shape similar to a screw or other shapes. The purpose of the spherical or other shapes (including cones) is only to keep the rotor stable.

2. The structural principle of metal float flowmeter

The flow detection element of metal float flowmeter is composed of a vertical conical tube that expands from bottom to top and a float group that moves up and down along the axis of the conical tube.

. The working principle is shown in Figure 1. When the measured fluid passes through the annular gap 3 formed by the conical tube 1 and the float 2 from bottom to top, a differential pressure is generated at the upper and lower ends of the float, forming a force for the float to rise. When the upward lift force on the float is greater than the weight of the float immersed in the fluid, the float rises, and the annular gap area increases accordingly. The fluid flow velocity at the annular gap immediately decreases, and the differential pressure between the upper and lower ends of the float decreases. The upward force acting on the float also decreases until the upward lift force is equal to the weight of the float immersed in the fluid, and the float stabilizes at a certain height. There is a corresponding relationship between the
Cone flowmeter
height of the float in the conical tube and the flow rate it passes through. The basic equation for volumetric flow rate Q is (1) when the float is a non solid hollow structure (load adjustment amount), then in equation (2), α - the flow coefficient of the instrument varies depending on the shape of the float; ε - the coefficient of gas expansion when the measured fluid is a gas, which is usually ignored due to its small correction amount and has been included in the flow coefficient through verification. If it is a liquid, ε=1; △ F - circulating annular area, m2; g - local gravitational acceleration, m/s2； Vf - Float volume, including any extended body, m3; ρ f - Float material density, kg/m3； ρ - the density of the fluid being measured, such as the density of gas on the upstream cross-section of the float, kg/m3； Ff - cross-sectional area at the working diameter (maximum diameter) of the float, m2; Gf - mass of the float, kg. The relationship between the circulating annular area and the height of the float is shown in equation

(3). When the structural design is determined, d and β are constants. There is a quadratic term for h in the equation, and this nonlinear relationship cannot be ignored. It can only be considered approximately linear when the cone angle is very small. In equation m2 (3), d represents the maximum diameter (i.e. working diameter) of the float, m; h represents the height at which the float rises from the point where the inner diameter of the cone tube is equal to the maximum diameter of the float, m; β represents the cone angle of the cone tube; a. B - Constant. The typical structure of a transparent conical tube float flowmeter with a diameter of 15-40mm is shown in Figure 2. The most common

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