Impeller flowmeter | Working principle and structure of gas turbine flowmeter

『Impeller flowmeter』Related information(clamp on meter|electromagnetic meter|venturi meterrotameter|orifice meter|ultrasonic flow meter|mass flow meter|coriolis mass flow meter|coriolis flow meter|magnetic flow meter|magmeter flow meter|magflow flow meter|mag meter flow meter|electromagnetic flow meter|vortex flow meter|turbine flow meter|thermal mass flow meter|thermal flow meter|rotameter flow meter)

What are the flow regulation methods for metering pumps?

2. What are the types of flow meters and what are their characteristics?

1. Mechanical principles of volumetric flow meters: Instruments belonging to this type of principle include differential pressure type and rotor type using Bernoullis theorem.; The impulse equation and movable tube equation using the momentum theorem; Using the direct mass formula of Newtons second law; Target based on the principle of fluid momentum; Turbine type using the angular momentum theorem; Vortex type and vortex street type utilizing the principle of fluid oscillation; Utilize pitot tube type, volumetric type, weir, trough type, etc. that utilize the total static pressure difference. 2. The working principle of the impeller flowmeter is to place the impeller in the measured fluid, rotate it under the impact of fluid flow, and reflect the flow rate by the speed of impeller rotation. Typical impeller flow meters are water meters and turbine flow meters, which can be of mechanical transmission output or electric pulse output structure. The accuracy of water meters with general mechanical transmission output is relatively low, with an error of about ± 2%, but the structure is simple and the cost is low. It has been mass-produced in China and standardized, universal, and serialized. The accuracy of the turbine flowmeter output by the electric pulse signal is relatively high, with a general error of ± 0.2% to 0.5%. 3. Differential pressure flowmeter (pressure drop flowmeter) The differential pressure flowmeter consists of a primary device and a secondary device. The primary device is called a flow measuring element, which is installed in the pipeline of the measure

d fluid, generating a pressure difference proportional to the flow rate (velocity) for the secondary device to display the flow rate. The secondary device is called a display instrument. It receives the differential pressure signal generated by the measuring element and converts it into the corresponding flow rate for display. The primary device of a differential pressure flowmeter is often a throttling device or a dynamic pressure measuring device (pitot tube, averaging tube, etc.). The secondary device is equipped with various mechanical, electronic, and combination differential pressure gauges with flow display instruments. The differential pressure sensitive elements of the differential pressure gauge are mostly elastic elements. Due to the square root relationship between differential pressure and flow rate, flow display instruments are equipped with square root devices to linearize the flow scale. Most instruments are also equipped with flow accumulation devices to display accumulated flow for economic accounting. This method of measuring flow using differential pressure has a long history and is relatively mature. It is generally used in important situations around the world, accounting for about 70% of various flow measurement methods. This type of meter is used for measuring the flow of main steam, feedwater, condensate, etc. in power plants. 4. Variable area flowmeter (isobaric flowmeter) The float placed in a conical flow channel with a larger top and a smaller bottom is moved by the force of the fluid flowing from bottom to top. When this force is balanced with the "displayed weight" of the float (the weight of the float itself minus the buoyancy of the fluid it is subjected to), the trap is at rest. The heig

Impeller flowmeter | Working principle and structure of gas turbine flowmeter

What are the flow regulation methods for metering pumps?

2. What are the types of flow meters and what are their characteristics?

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