Vehicle-mounted sonic nozzle gas flow standard device

The utility model discloses a vehicle-mounted sonic nozzle gas flow standard device. The device comprises a main machine assembly, a fan assembly and a control assembly which are all fixedly installedin a carriage, a counter is arranged in the carriage, a detected meter table position used for placing a detected meter is arranged on the counter, the detected meter is communicated with the main machine assembly and the fan assembly through a breather pipe section for detection, and the main machine assembly comprises a sonic nozzle set. According to the vehicle-mounted gas flow standard device, all systems needed by instrument calibration are fixedly installed in the carriage, after the vehicle is driven to the place where a user instrument is located, all calibration processes can be completed in the carriage without moving equipment down, and the working efficiency is greatly improved; the sonic nozzle group is applied to the calibration system, and compared with a standard meter method device, the sonic noz