V-cone flowmeter | DQV series V-cone flowmeter, can it measure sewage?

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1. Working principle of V-cone flow meter

The working principle of V-cone flow meter is based on the principle of differential pressure, which calculates the flow rate by measuring the pressure difference generated when the fluid flows through the cone. Its core is to use the regulating effect of the cone on the fluid velocity distribution to achieve stable measurement. 1. The application of differential pressure flow meters has a history of over a hundred years, and its core basis is the energy conversion principle in sealed pipelines: the relationship between flow rate and flow velocity: for stable fluids, the flow rate (Q) is proportional to the square root of the medium flow velocity (v) in the pipeline, that is, $Q propto sqrt {v} $. Pressure change mechanism: When the fluid flows through the cone, the flow velocity and pressure undergo dynamic changes: inlet pressure (P1): the initial pressure of the fluid before approaching the cone. Throat pressure (P2): When the fluid passes through the conical interception zone, the increase in flow velocity leads to a decrease in pressure. Differential pressure signal: The difference between P1 and P2 (Δ P=P1-P2) is transmitted to the differential pressure transmitter through the pressure port as the basis for flow calculation.

2. The unique design of the V-cone flowmeter lies in its conical flow interception element, which optimizes the fluid state in the following ways: ideal flow velocity distribution under flow state: undisturbed fluid in the pipeline follows a parabolic distribution: the flow velocity at the pipe wall is close to zero virtual feet (due to friction), and the flow velocity at the center of the pipeline is the highest.

. The cone is suspe V-cone flowmeter

nded at the center of the pipeline and directly contacts the high-speed fluid area, forcing the high-speed fluid to mix with the low-speed fluid near the pipe wall, resulting in a uniform velocity distribution. Stability at low flow rates: Conventional differential pressure instruments may experience measurement errors due to uneven flow velocity distribution at low flow rates, while V-cone flow meters ensure continuous interaction between the fluid and the highest flow velocity at the center of the pipeline through cone mixing, generating accurate differential pressure signals. 3. Optimization of upstream flow velocity distribution. In actual pipelines, components such as elbows, valves, and reducers can disrupt flow velocity uniformity and affect measurement accuracy. The V-cone flowmeter solves this problem by reshaping the flow velocity curve: the cone readjusts the upstream turbulent flow velocity distribution, even if there are changes in the pipeline (such as bends, pumps, etc.), it can still maintain a stable differential pressure signal. Anti interference ability: The presence of a cone allows the fluid to form a relatively uniform velocity distribution before reaching the pressure tap, reducing the impact of external interference on Δ P and ensuring measurement accuracy. The flow calculation formula of a V-cone flowmeter uses the standard differential pressure instrument formula, but is modified based on the characteristics of the cone. The basic formula is: $Q=C cdot A cdot sqrt {frac {2 Delta P} {rho (1- (frac {d} {D}) ^ 4) $, where $Q $: volumetric flow rate; $C $: Outflow coefficient (related to cone shape and Reynolds number); $A $: Pipeline cross-sectional area; Delta P: Differential pressure (P1-P2); Rho

V-cone flowmeter | DQV series V-cone flowmeter, can it measure sewage?

1. Working principle of V-cone flow meter

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