1. Product Introduction
1.1 Product Description
The measurement of fluid flow plays an important role in industrial production and process control. Due to the complexity of fluid properties, flow state, flow conditions and sensing mechanism, the diversity, specialization and price difference of flow measurement instruments are nowadays. The flow sensor as its core part is of various types and developing rapidly.
The Venturi tube is a throttling flow sensor. Its working principle is based on the Venturi effect, that is, when the restricted flow passes through the reduced flow section, the fluid flow rate increases, and the flow rate is inversely proportional to the flow section. The Venturi tube consists of three parts: the contraction section, the throat and the diffusion section. It is widely used in energy and power industries such as gas, electricity, and cement for its simple structure, wide range of applicable working conditions, and easy real-time monitoring. The measurement method of the Venturi tube is based on the fluid flow continuity equation and the Bernoulli equation. The flow rate is calculated by measuring the pressure difference before and after the throat of the Venturi tube.
The orifice flowmeter is a differential pressure flowmeter. Its working principle is that when the fluid flows through the throttling device in the pipeline, the flow beam forms a local contraction at the throttling device, resulting in an increase in flow velocity and a decrease in static pressure, thereby generating a pressure drop before and after the throttling device, that is, a pressure difference. The greater the flow rate of the medium, the greater the pressure difference generated before and after the throttling device. The size of the fluid flow is measured by measuring the pressure difference. This measurement method is based on the law of conservation of energy and the law of flow continuity. The orifice flowmeter has the characteristics of simple structure, easy maintenance, stable performance, and reliable use. It is widely used in the flow measurement of gas, steam and liquid.
Rotor flowmeter (Rotometer), also known as float flowmeter, works on the principle that in a vertical cone tube that expands from bottom to top, the flow of the fluid impacts the rotor and generates a force on it. When the flow rate is large enough, the generated force lifts the rotor. At the same time, the measured fluid flows through the annular section between the rotor and the conical tube wall, and there are three forces acting on the rotor: the dynamic pressure of the fluid on the rotor, the buoyancy of the rotor in the fluid, and the gravity of the rotor itself. When these three forces are balanced, the rotor floats steadily at a certain position in the cone tube, and the position of the rotor in the cone tube corresponds to the flow rate of the fluid flowing through the cone tube. The rotor flowmeter is suitable for the flow measurement of small and medium diameter pipes, and has the advantages of small and constant pressure loss, wide measurement range, large range ratio, reliable operation and linear scale, and convenient use and maintenance.
These three flowmeters have their own characteristics and applicable scenarios. In experimental equipment, they can be used to accurately measure and control the flow rate of fluids, which is of great significance for the teaching and research of fluid mechanics.
1.2 Product Features
1. The product design is beautiful, sturdy and durable.
2. The product structure is clear and the principle is clear.
3. The product has rich experimental modules and can be used for rich experiments.
2. Technical specifications
2.1 Technical parameters
Rotor flowmeter measurement range: 0-4m³/h.
Level meter measurement range: 0-570mm.
Working environment conditions: Ambient temperature: 10℃～30℃ Relative humidity ＜ 75% (25℃).
2.2 Dimensions and weight
Dimensions: 905x383x832mm
Weight: 30kg
