Waste exhaust ventilation door automatic control device and vehicle body having the same

A waste exhaust ventilation door automatic control device, comprising:

• a core body, one or more inner door bodies and a plurality of outer door bodies;
• the core body is fixed on a ventilation opening of a waste exhaust ventilation door, a top of each outer door body is movably hinged on an outer side of the core body, and a bottom of each inner door body is movably hinged on an inner side of the core body;
• when there is no pressure fluctuation outside the core body, each outer door body and inner door body will open, and when there is pressure fluctuation outside the core body, each outer door body and/or each inner door body will be closed automatically due to a pressure difference between inside and outside the core body;
• wherein when there is no pressure fluctuation outside the core body, an air pressure inside the core body is 30 Pa-50 Pa and is smaller than an air pressure inside the core body when outside pressure fluctuation occurs;
• wherein in case there is pressure fluctuation outside the core body, each outer door body is closed when an air pressure outside the core body is greater than an air pressure inside the core body;
• each inner door body is closed when the air pressure outside the core body is smaller than the air pressure inside the core body;
• and the outer door bodies and the inner door bodies are both closed when the air pressure outside the core body is equal to the air pressure inside the core body;
• and
• wherein the core body comprises a core plate and brackets, wherein the core plate communicates with the ventilation opening of the waste exhaust ventilation door, two brackets respectively stand on the core plate oppositely, an outer side of each bracket is movably hinged to the top of one outer door body, and an inner side of each bracket is movably hinged to the bottom of one inner door body, when at least one of the outer door bodies and at least one of the inner door bodies are closed, the at least one of the outer door bodies and at least one of the inner door bodies are connected hermetically with the bracket respectively.