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Product Introduction
Detailed Overview:
Introduction to V-cone flowmeter in coal mines:
The V-cone flowmeter in coal mines is a novel differential pressure flowmeter that utilizes the throttling effect generated by the V-cone in the flow field to measure flow rate. Compared with ordinary throttling components, it has changed the throttling layout from central throttling to circular throttling. Compared with general differential pressure flow meters, V-cone flow meters have the advantages of high long-term accuracy, high repeatability, limited installation conditions, wear resistance, wide measurement range, suitability for dirty media, and low pressure loss.
Measurement principle of V-cone flowmeter in coal mines:
The V-shaped internal cone throttling device includes a pointed cone and corresponding pressure tapping port coaxially installed in the measuring tube. The measuring tube is pre precision machined, generating differential pressure at both ends of the pointed cone. The high pressure (positive pressure) of this differential pressure is the static pressure measured at the pressure port on the pipe wall before the upstream fluid contracts, while the low pressure (negative pressure) is obtained by opening a pressure hole at the center axis of the cone facing downstream.
The square root of the difference between high and low pressure is directly proportional to its volumetric flow rate, and the flow rate is obtained by measuring the differential pressure upstream and downstream of the V-cone. This measurement method is based on the principles of flow continuity equation (law of conservation of mass) and Bernoulli equation (law of conservation of energy). Therefore, its flow calculation formula is the same as other differential pressure flow meters.
Characteristics of V-cone flowmeter in coal mines:
1. The sensor body can shape the fluid flow state.
2. Wide range ratio, high accuracy, and good repeatability.
3. Wear resistant and have good long-term stability.
4. The required straight pipe section is very short, and there is no need to install a flow regulator upstream of the flowmeter.
5. The flow meter structure has a self-cleaning function and will not produce dirt and grime, making it very suitable for flow measurement of dirty fluids such as coke oven gas and wet gas.
6. The inner cone can reduce the amplitude of pulsating oscillations in the measured pressure differential field, thereby reducing the noise in the differential pressure signal.
7. No movable parts, good reliability, easy installation.
8. When fluid flows through an inner cone with a special profile, a boundary layer is formed around it and guides the fluid away from the edge of the cone tail, reducing its likelihood of wear.
9. Low pressure loss, suitable for flow measurement of low static pressure fluids.
10. Circular channel provides more accurate and effective flow measurement for dirty and dirty flows.
Installation method of V-cone flowmeter in coal mine:
1: The method of installing pipeline flanges is as follows: the V-cone flowmeter has two flanges at each end, which are connected to the flanges on the pipeline. This is a commonly used connection method in industry, especially suitable for connecting various pipeline diameters. This installation method can be installed separately with differential pressure transmitters and is usually used to measure the flow rate of steam and high-temperature media.
2: The flange clamping installation method is as follows: both ends of the V-cone flowmeter are equipped with flanges. When the connected pipeline has no flange connection, welding can be used for connection, and then the V-cone flowmeter is installed between the flanges.
3: The pipeline welding installation method is to directly weld the V-cone flowmeter to the pipeline without flange connection. This method has a lower installation cost and reduces the cost of four flanges. It is suitable for installation sites with large caliber flow meters and is a one-time installation method.
Technical parameters of coal mine V-cone flowmeter:
1. Uncertainty: ± 0.5%, ± 1%.
2. Wide range: 10:1.
3. The repeatability is better than ± 0.1%.
4. Installation of straight pipe section length: upstream 0-3D, downstream 0-1D
5. Reynolds number range: 8 × 103 to 1 × 107
6. Pipeline diameter: 15mm ≤ D ≤ 2000
7. Nominal pressure: PN ≤ 42Mpa
8. Medium temperature: -250 ℃ ≤ t ≤ 500 ℃
9. Reference standards: GB/T2624-2006, JJG640-94, and Design Manual for Flow Measurement Throttle Devices
10. Connection methods: flange connection, welding, threaded connection
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