Variable-diameter negative pressure type breeze speed calibration device
A calibration device and variable technology, applied in the direction of measurement device, speed/acceleration/shock measurement, test/calibration of speed/acceleration/shock measurement equipment, etc. The problem of large range and insufficient static pressure change can achieve the effect of fast measurement data, simple manufacturing process and stable airflow
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[0024] Example one
[0025] See figure 1 The invention discloses a variable-diameter negative pressure type breeze speed calibration device, which mainly includes a variable-diameter standard flow tube 7, a divergent rectifying air pipe 11, a standard air duct 5, a static pressure box 4, and a centrifugal fan 1. Inverter 2. Micro differential pressure gauge 10.
[0026] The air inlet end of the device is a variable-diameter standard flow tube 7, which is connected with a gradually expanding rectifying air pipe 11, which is connected with a standard air duct 5, and the standard air duct 5 passes through a static pressure box 4 Flange connection, the static pressure box 4 is connected with the suction port of the centrifugal fan 1 through the hose 3, and the frequency converter 2 is connected with the centrifugal fan 1 through wires. The collection hole 8 is connected to the micro differential pressure gauge 10 through a rubber tube 9. The standard air duct 5 is provided with an win...
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