Uniflow smoke exhaust system under subway station rail-mounted area fire working condition

The invention provides a one-way flow smoke exhaust system under a subway station rail-mounted area fire working condition. The system is suitable for a subway station adopting a one-way flow upward heat removal mode in a rail-mounted area, and can operate under the working conditions of normal operation of a train and fire occurrence in the rail-mounted area. When a one-way flow ventilation mode is adopted in a rail-mounted area for heat removal or smoke removal work, the auxiliary device installed near the shielding door is started, so that air flow can form one-way flow in the rail-mounted area, and meanwhile high-temperature air or fire smoke is effectively prevented from invading a platform through the opened shielding door. The system prevents hot air in a rail-mounted area from invading a platform under the normal operation condition of a train, and the effect of reducing the energy consumption of a station environment control system is achieved; fire smoke is prevented from invading the platform under