The working principle of the nozzle flowmeter and its advantages and disadvantages
First, the working principle of the nozzle flowmeter.
The nozzle flowmeter is a common differential pressure flowmeter that calculates the flow rate by means of a small differential pressure of the nozzle shrinkage section and downstream obstacles according to the Bernoulli equation. Specifically, the nozzle flowmeter has a nozzle and an obstacle, and the liquid flows through the nozzle when working, and the flow rate increases and the pressure decreases due to the action of the nozzle shrinking section. Subsequently, the pressure rises at the obstacle, and the pressure difference between the upstream and downstream of the obstacle is the differential pressure signal of the nozzle flowmeter. According to the principle of fluid mechanics, the flow rate can be calculated from this differential pressure signal.
Second, the advantages and disadvantages of nozzle flowmeter.
1.Merit.
1) High accuracy: Because the working principle of the nozzle flowmeter is relatively accurate, its measurement accuracy is relatively high, which can meet the requirements of high-precision measurement.
2) Wide range of application: Nozzle flowmeter can measure various fluids from low speed to high speed, and is suitable for a variety of fields, such as chemical industry, water conservancy, environmental protection, etc.
3) Good stability: due to the simple structure of the nozzle flowmeter, its stability is high, and it can work stably for a long time.
2.Shortcoming.
1) Large pressure loss: Because the nozzle flowmeter needs to increase the flow rate through the shrinkage section of the nozzle when working, its pressure loss is large.
2) High requirements for selection and use: due to the complex application of nozzle flowmeter, its selection and use requirements are high, and it is necessary to select according to the actual needs, and it is necessary to pay attention to the nature of the fluid and the working state of the flowmeter when using.
3. Application scenarios of nozzle flowmeter.
Due to the advantages of high accuracy, wide application range and good stability, nozzle flowmeter has been widely used in many fields. Here are some of the specific application scenarios of nozzle flowmeters:
1) Chemical industry: nozzle flowmeter can be used for liquid metering in chemical processes, such as measuring acids and alkalis.
2) Environmental protection field: Nozzle flowmeter can be used for flow measurement in environmental protection fields such as air pollution detection and wastewater treatment.
3) Water conservancy engineering: nozzle flowmeter can be used in water conservancy engineering, water quantity measurement, hydraulic machinery, etc.
To sum up, the nozzle flowmeter is a common differential pressure flowmeter, and its advantages include high accuracy, wide application range, good stability, etc. However, there are also shortcomings, such as large pressure loss, high selection and use requirements. In practical application, it is necessary to select according to the actual needs, and it is necessary to pay attention to the nature of the fluid and the working state of the flowmeter when using.