Life cabin emergency breathing air switching system

The invention discloses an emergency breathing air switching system for a life cabin, which belongs to the field of medical pressure containers and comprises a life cabin, a gas transmission mask, a treatment breathing gas source, an emergency breathing gas source, a breathing gas switching device, a fire detector and a fire extinguishing device. The supply of the treatment breathing air source and the supply of the emergency breathing air source are switched by the breathing air switching device, so that the oxygen content in the life cabin is reduced; the fire extinguishing device comprises a fire extinguishing cavity communicated with the life cabin; the fire extinguishing device is used for extinguishing fire in the life cabin in a suction circulation mode. The life cabin can effectively improve the survivability of personnel in the life cabin when a fire occurs, and reduces the risk of respiratory tract burn and suffocation of the personnel in the life cabin. 本发明公开了一种生命舱应急呼吸空气切换系统，属于医用压力容器领域，包括生命舱、输气面罩、治