Standard flow type micro wind speed calibration apparatus and calibration method thereof

A standard flow, calibration device technology, applied in measurement devices, speed/acceleration/shock measurement, testing/calibration of speed/acceleration/shock measurement equipment, etc. problems, to achieve the effect of saving length, uniform and stable airflow, and accurate measurement data

Inactive Publication Date: 2008-11-12
UNIV OF SHANGHAI FOR SCI & TECH
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  • Abstract
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Problems solved by technology

[0003] The purpose of the present invention is to provide a standard flow type micro-wind speed calibration device with convenient operation, high precision, strong stability, stable speed regulation, convenient movement and l

Method used

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  • Standard flow type micro wind speed calibration apparatus and calibration method thereof
  • Standard flow type micro wind speed calibration apparatus and calibration method thereof
  • Standard flow type micro wind speed calibration apparatus and calibration method thereof

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Embodiment Construction

[0026] Standard flow type breeze speed calibration device, such as figure 1 Shown. The air inlet end is a standard flow tube 7, which is connected to the diverging rectifying air pipe 11, which is connected to the standard air duct 5, the standard air duct 5 and the static pressure box 4 are connected by flanges; the static pressure box 4 The suction port of the centrifugal fan 1 is connected with the hose 3, and the inverter 2 is connected with the motor of the centrifugal fan 1 through a wire; the standard flow tube has a static pressure collection hole 8, and the static pressure collection hole is connected to a slight pressure difference through a rubber tube 9 The meter 10 is connected, and an anemometer measuring hole 6 is provided on the standard air duct. The frequency converter controls the motor speed and adjusts the air volume of the fan; the standard air duct adopts negative pressure to introduce air. The standard flow type breeze speed calibration device is placed as ...

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Abstract

The invention discloses a standard flow micro wind velocity calibration device which is characterized in that: a wind inlet port is a standard flow tube connected with a diverging rectification wind tube; the diverging rectification wind tube is connected with a standard air duct that is connected with a static pressure box; the static pressure box is connected with the suction inlet of a centrifugal fan by a hose; an inverter is connected with the motor of the centrifugal fan by an electrical wire; the standard flow tube is provided with a static pressure acquisition hole connected with a micropressure difference meter by a rubber tube; the standard air duct is provided with a wind velocity measuring hole, connected with the static pressure box by a flange and adopts a negative pressure manner to introduce air; the whole device is fixed on a wheelbarrow. According to the law of conservation of mass, the standard average wind velocity of the standard air duct can be calculated by standard flow and then tube axis wind velocity can be obtained by theoretical arithmetic according to the distribution and flow characteristic of flow in tubes and is taken as the wind velocity of a standard point. The device of the invention has the advantages of convenient operation, high precision, strong stability, stable adjustment velocity and convenient movement, etc.

Description

Technical field [0001] The invention relates to a standard flow type breeze speed calibration device and a calibration method, which are used for calibrating and correcting test instruments, in particular for calibrating low wind speed anemometers. Background technique [0002] The hot wire anemometer must be accurately calibrated when it leaves the factory, and must be calibrated after a certain period of operation. But it is very difficult to calibrate low wind speed (V<3m / s). At present, there are two commonly used anemometer calibration methods in the industry: one is to calibrate the anemometer in static air at a moderate speed. This method has a complex structure, especially the static air that is easily disturbed, which affects the calibration accuracy; The other is the relative calibration method, which uses the Pitot tube differential pressure gauge method to calibrate. According to the Pitot tube differential pressure gauge reading, calculate the wind speed into the ...

Claims

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Application Information

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IPC IPC(8): G01P21/02
Inventor 邹志军王非李浩路建岭
Owner UNIV OF SHANGHAI FOR SCI & TECH
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