的概述 Overview of a new type of differential pressure flowmeter
DXVD type V cone flowmeter is a new type of high precision differential pressure flowmeter. A special streamlined cone is suspended from the centerline of the closed pipe for central throttling, and the differential pressure measured by the upstream pipe wall and the tail of the cone is used to calculate the flow rate, hence the name V-cone flowmeter. 独特的结构设计，其性能较于其他差压式流量计更优。 Due to the unique structural design of the V-cone flowmeter , its performance is better than other differential pressure flowmeters.
DXVD V-cone flowmeter, like other differential pressure flowmeters, is based on Bernoulli's law for energy conversion in closed pipes. That is, in a stable flow field, the velocity of the medium is proportional to the square root of the differential pressure. . When the medium flows towards the cone tip at a certain speed, due to the throttling effect of the cone, a low-pressure region P2 will be immediately formed downstream of the cone. There is a pressure difference ΔP between the high pressure P1 upstream of the cone and the low pressure P2 downstream. The difference △ P is sent to the differential pressure transmitter through the pressure taking port, and the change of the flow rate can be measured according to the change of the differential pressure.
Composition of flow measurement system
DXVD type V-cone flowmeter consists of a built-in cone throttle, three valve groups, heat sink, impulse tube, differential pressure transmitter, and flow computer to form a flow measurement system. For media such as gas and steam, temperature and pressure compensation can be added to form a mass flow and standard volume measurement system. 分:精确管道型(DNl5～DN900或更大);对夹型(DNl5～DNl50) DXVD type V-cone flow metering : precise pipeline type (DNl5 ～ DN900 or larger); wafer type (DNl5 ～ DNl50)
1. High accuracy and good repeatability:
The accuracy of the V-cone flowmeter is ± 0.5% of the measured value, and the repeatability is ± 0.2%.
2. Wide range ratio and low pressure loss:
The V-cone flowmeter has a range ratio of 10: l under normal conditions. The parameters can be accurate to 30: l, and the pressure loss of the V-cone flowmeter is only l / 5 ～ l / 10 of the orifice plate, which can greatly reduce the operating energy consumption.
3.Low requirements for installing straight pipe sections:
Due to the unique central streamline throttling structure of the V-cone flowmeter, the problem of straight tube rectification is well solved, and the irregular fluid is directly rectified into the ideal fluid. .
4.Good long-term stability:
The unique design of the cone ensures that the fluid flows through the cone in a gradual process without mutation. The flow passes through the cone first and then reaches the cone edge. Therefore, the cone will not be frequently worn by the fluid. The β value can remain unchanged for a long time, so the meter can be used for a long time without recalibration.
5.Wide range of applications, can measure high temperature and high pressure and complex working medium:
The V-cone flowmeter is the same as the orifice plate throttling device. The operating temperature and pressure depend on the material and grade of the pipe and flange. Special fluid-saving makes it possible to measure multi-phase water flow, electromagnetic interference media, various mixed gases, etc. Ideal for measuring dirty media such as steam, gas, crude oil, etc.
运用工况范围非常广，温度-100℃～500℃，最大压力40MPa，雷诺数范围广8×10 3～5× 106。 V cone flowmeter has a wide range of operating conditions, temperature -100 ℃ ～ 500 ℃, maximum pressure 40MPa, and Reynolds number range 8 × 10 3 ～ 5 × 106. 等。 Gas: gas, natural gas, air, oxygen, nitrogen, hydrogen, methane, propylene, flue gas, saturated steam, superheated steam, etc.
Liquid: water, oil, emulsion, pure water, hydrogen peroxide, glycerol, alcohol, water purification, sewage, various corrosive media, etc.
6.With self-cleaning ability: