The structural characteristics of ventilation fans are applied to tunnel ventilation systems.
Tunnel ventilation fans are divided into unidirectional jet fans (SDS) and tunnel jet fans SDS (R).
The fan body, muffler, and bracket feet are made of steel plate CNC automatic welding and mechanism forming, with surface coating to ensure the strength and corrosion resistance of the fan.
Fan impeller: To meet the needs of tunnel ventilation, SDS series fans can change the number and angle of blades.
Muffler: The length of a muffler is usually twice the diameter of a fan.
When the noise requirement is high, twice the diameter of the fan can also be fixed with bolts.
Supporting motor: The SDS series jet fan is equipped with a fully enclosed squirrel cage motor and a flange mounting plate. The motor insulation level is H and the anti-corrosion level is IP55. The motor cable can be connected to the fan housing junction box, and the motor has a lubricating oil nozzle. The external metal hose is connected to the lubricating oil nozzle on the fan housing.
Reversible switching time of the fan: In emergency situations, the forward and reverse switching time of the jet fan is very important.
There are two switching methods for SDS (R) fans: electronic and mechanical, which can switch to the rated speed of the fan within 30 seconds.
SDS series jet ventilation fan testing and inspection.
Thrust test: Measure with a thrust test device.
High temperature fire test: Conducted by the Tianjin Fire Test and Inspection Center of the Ministry of Public Security.
Noise testing: Both the installation and non installation of mufflers at the inlet and outlet of the fan are tested in an open area (when the atmospheric wind speed is close to 0), and the sound pressure level of the fan is tested at a 45 ° angle along the fan axis, 10m away from the fan.
