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

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 micro-wind speed calibration device and a calibration method, which are used for calibration and correction of testing instruments, especially for calibrating low wind speed anemometers. Background technique [0002] The hot wire anemometer must be accurately calibrated when it leaves the factory, and it needs to be calibrated after working for a certain period of time. But it is very difficult to calibrate for low wind speed (V<3m / s). At present, there are two kinds of anemometer calibration methods commonly used in the industry: one is to calibrate the anemometer moving at a constant speed in still air. This method has a complex structure, especially easy to disturb the still air, which affects the calibration accuracy; The other is the relative calibration method, which uses the pitot tube differential pressure gauge method for calibration, and calculates the wind speed in and out of the air duct acc...

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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 low wind speed calibration, which overcomes the complicated operation, low precision and low wind speed of existing calibration devices. Disadvantages of inconvenient movement and inability to perform low wind speed calibration

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