8966780 B2 abstract a tumble dryer includes a housing which has an enclosable drying chamber a heater mounted in the enclosable drying chamber a gate for closing opening the enclosable drying chamber and a tumbler rotatably mounted in the drying chamber an intake pipeline equipped with an intake control valve for guiding outside air into the drying chamber an exhaust pipeline equipped with an exhaust control valve for guiding air out of the drying chamber to the atmosphere an air suction pipeline equipped with a pipeline control valve and having a pump installed therein for pumping air out of the drying chamber to the atmosphere application_number US 85707810 A description referring to fig1 a tumble dryer in accordance with a first embodiment of the present invention is shown comprising a housing 10 an intake pipeline 20 an exhaust pipeline 30 and an air suction pipeline 40 the housing 10 comprises a drying chamber 12 that can be closed a heater 13 mounted in the drying chamber 12 and adapted for heating the air in the drying chamber 12 a gate 14 arranged at one side of the drying chamber 12 and openable for enabling the during chamber to be in communication with the outside space and a tumbler 15 rotatably mounted in the drying chamber 12 for holding things to be dried further a barometer 16 a thermostat 17 and a timer 18 are mounted on the top side of the housing 10 the barometer 16 can indicate the value of the air pressure in the drying chamber 12 the timer 18 is adapted for setting the operation time of the tumbler 15 the thermostat 17 is adapted for controlling the setting of the heating temperature of the heater 13.