| 摘要 |
In a subway ventilating system where two stations are connected by a pair of tunnel tubes, a cross-connection is provided between the tubes adjacent each of the stations. The cross-connections are not open to the outside atmosphere. Fans are located in the cross-connections for withdrawing a fractional amount of the air pushed ahead of the train as it moves through one of the tubes and for injecting it through a nozzle into the other tube in the direction toward the station from which the train departed. Due to the injection of a portion of the air into the other tube, the remaining portion of the air pushed ahead of the train is pulled into the other tube and is directed back toward the station from which the train departed. Further, for ventilating the tunnel tube and the station, a ventilating shaft is located in a mid-portion of the tubes intermediate the stations for withdrawing air from the tubes and directing it into the outside atmosphere and for pulling air in from the outside atmosphere and circulating it into the tubes.
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