第1个回答 2010-06-15
Wuhan-guangzhou passenger special line and zheng west passenger railway, professional leaps 350km/h operations per set the world record, but in high speed railway passenger on the journey comfort requirements more and more is also high. High-speed actuation vehicle speed through the tunnel and pulses in/under pressure, the function, the tunnel body surface wave produced strong pressure and negative pressure of shock wave, the air inside the system caused by pressure drop, when air pressure drop speed fast, will make the human ear appear tinnitus, expansion and ear pain symptoms. In order to solve the high-speed trains passing through a tunnel and passenger vehicle, the symptoms appear, we train CRH2 type ventilation control system is studied, and provide fresh air and gas discharge waste gas function, ventilators, adopts two-way fan by a frequency conversion control principle of the shaft motor drive two pairs of high speed centrifugal fan on the passenger trains the intake and exhaust. Fresh air outside the car after adjusting plate with the contralateral to the wind, high pressure air suction fan, air conditioning units, sent two relays in return is high exhaust fan motors with inhaled, enter the ventilators, cooling fan passages from the adjustment of the plate after motor vehicle exhaust outlet. During normal operation, it can guarantee the wind from the room air exhaust air is fresh and complement, thus ensuring the air pressure inside the classroom. The design requirements for the ventilation system is installed on the throttle air passages in the car, by inside and outside pressure sensor, the detection speed through train tunnel, when interior pressure decreases, and single-chip microcomputer control, adjust the throttle discharge air inside the car, so as to ensure that the pressure change does not affect the passenger comfort.