A passenger transport vehicle includes an air opening connecting an environment having external pressure, to a vehicle interior for people having interior pressure. A flap opens or closes the opening and a pressure protection facility controls the flap. The pressure protection facility has a measuring apparatus detecting pressure difference between external pressure at an external pressure connection and interior pressure at an interior pressure connection, of the measuring device. A pressure evaluation facility, which monitors pressure difference values from the measuring apparatus, closes of the flap when the pressure difference reaches a predefined closing threshold value, and opens the flap if the pressure difference reaches a predefined opening threshold value. When the flap is opened, the pressure differential is formed at the measuring apparatus from the external pressure and a reference interior pressure provided by a reference apparatus simulating interior pressure behavior of the vehicle with the flap closed.

A positive and negative oxygen ion air purification system uses dielectric barrier discharge for rail transport. The system includes: an air intake device including a first damper and second damper, wherein the first damper is in communication with the second damper; an evaporator disposed within the air intake device, wherein gas flowing through the first damper and second damper passes through the evaporator; a purification device, wherein gas flowing through the first damper and second damper passes through the purification device, wherein the purification device includes a mounting plate, a power supply module and an ion generation module, the purification device is disposed on the air intake device by the mounting plate, and the power supply module includes an input end, a transformer, and an output end; a detection device; and a control device connected to the detection device, the air intake device and the purification device.

A rail vehicle and a low-vacuum rail vehicle system. The rail vehicle comprises: a ram air inlet, the ram air inlet being provided outside a carriage; a compressor, an air inlet of the compressor being communicated with the ram air inlet; a heat exchanger, a hot-side inlet of the heat exchanger being communicated with an air outlet of the compressor), a hot-side outlet of the heat exchanger being communicated with the inner space of the carriage, and a cold side of the heat exchanger being provided with a refrigerant for heat exchange; and an exhaust valve, a first end of the exhaust valve being provided on the inner side of the carriage, and a second end of the exhaust valve being provided on the outer side of the carriage.