Multiple air channel air amount measuring method and device in large air channel

A measurement method and measurement device technology, which is applied in the direction of volume/mass flow generated by mechanical effects, fluid flow through measurement of pressure difference, etc., can solve problems such as on-site conditions and spatial locations that cannot meet measurement requirements, and achieve the effect of reducing requirements

Inactive Publication Date: 2003-01-22
ZHEJIANG UNIV
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Problems solved by technology

To measure accurately, it is necessary to stabilize the rectification to meet the requirements of the measu

Method used

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  • Multiple air channel air amount measuring method and device in large air channel
  • Multiple air channel air amount measuring method and device in large air channel
  • Multiple air channel air amount measuring method and device in large air channel

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Embodiment Construction

[0018] The method of measuring the air volume of the large-section air duct is to transmit the pressure difference to the signal collector through the pressure sensor, and use the pressure difference of each wind measuring device in parallel to generate a pressure difference for transmission, or use the pressure difference of each wind measuring device to transmit separately.

[0019] The flow coefficient of the wind measuring device in the sub-air duct in the calculation of the air volume of the air duct completed by the host computer of the above system is calculated according to the individual calibration value.

[0020] The large-section air duct partition air volume measuring device is provided with a rectifying device 1, an air measuring device 2, and an air duct dividing plate 3 in sequence in the air duct. The rectification device is a uniform or non-uniform grid. The wind measuring device 2 is an airfoil wind measuring device, a Venturi wind measuring device, a flute ...

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Abstract

The measurement method includes separating large air channel into several parts, measuring the total pressure and static pressure difference of the parts separately with several wind-measuring devices, transferring pressure difference via pressure sensor to signal collector and completing air channel wind amount calculation and display via system unit. The present invention has the advantages of raised measurement precision owing to the grille to commutate; lowered space position precision requirement in wind-measuring device owing to the reduced channel equivalent diameter and size of wine-measuring device; and reduced size of required straight pipe section owing to the reduced channel equivalent diameter.

Description

technical field [0001] The invention relates to a method and device for measuring the air volume of multiple air ducts in a large air duct. Background technique [0002] For a long time, the online measurement of air volume in large-section air ducts has been a difficult problem. The air flow in large air ducts is often affected by external factors such as dampers, flow channel turning, diversion and confluence, and expansion and reduction of pipe cross-sections, making the flow of large air ducts develop into Flows with complex velocity distributions. [0003] The influencing factors of flow measurement are various, because there are: 1. The diversity of fluid properties, such as the difference of fluid viscosity, single-phase and multi-phase, compressible and incompressible, the level of pressure and density parameters, The cleanliness of the fluid, etc.; 2. The diversity of the pipeline system, such as the circular or non-circular cross section of the pi...

Claims

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Application Information

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IPC IPC(8): G01F1/34G01F1/44
Inventor 岑可法蒋啸池作和周昊
Owner ZHEJIANG UNIV
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