Why is the toilet suction on the plane so great

The suction power of the toilet on the plane is not large, and it is a false proposition to say that the vacuum toilet on the plane has a large suction power.

Taking the Airbus A320 aircraft as an example, the construction principle of the toilet on the aircraft:

A320 aircraft, on the ground or flying below the set altitude (4877M), through the vacuum motor will create negative pressure in the waste water tank, this negative pressure is transmitted to the toilet basin through the pipeline, the dirt is sucked into the waste water tank, the blue path in the figure is the vacuum motor to generate negative pressure, the air in the tank is pumped out of the machine.

When the flight altitude exceeds the set altitude, the vacuum motor will not work, and the negative pressure path at this time is provided by the red line. Because, when the flight altitude is high, the air density outside the aircraft is small and the air pressure is low, so the pressure difference between the inside and outside of the fuselage can be relied on to generate negative pressure in the pipeline and suck the dirt from the toilet basin to the waste water tank.

The data shows that this negative pressure is about. (psi(lb in2) pound square inch), 1psi(Lb in2) = bar=

According to the above formula, it is about kilogram force square centimeters, generally speaking, a punch of a normal strong man is about 150 kilograms, so compared to the negative pressure of the vacuum toilet compared to the fist, the two are far from the same.

White has little appeal to the toilets on airplanes. It is a false proposition to say that vacuum toilets have a lot of suction power on airplanes.

Taking the Airbus A230 aircraft as an example, the construction principle of the toilet on the aircraft:

The A230 aircraft is on the ground, or at a set altitude (877 meters), through the vacuum motor will produce negative pressure wastewater, through the pipeline negative pressure pumping toilet, sucking dust into the waste water tank, the blue path map is the vacuum motor to generate negative pressure, the air tank inside the closed path diagram.

When the flight altitude exceeds the set altitude, the vacuum motor does not work, and the negative pressure path is provided by the red loop. Because, when flying at higher altitudes, the air outside the aircraft is less dense and the air pressure is low, and the pressure difference between the inside and outside of the fuselage can cause negative pressure in the pipes, which will suck the dirt from the toilet into the waste water tank.

The result is negative pressure approximately. 9psi。(psi (pound inch) pound square inch).

PSI (lb) 7dukgf cm. zhi89 bar 89kPa

According to the above formula,. 9psi approx. Kilogram force square centimeters. Generally speaking, a normal person's fist is about a knife kilogram, which is far from the negative pressure of a vacuum toilet compared to the negative pressure of a fist.

The outside of the aircraft is in the stratosphere, the flight altitude of the general civil airliner is between 18000m-20000m, due to the high altitude, the atmospheric pressure is very small, the air pressure on the ground is in the aircraft at the time of takeoff, therefore, when flying, there is a large pressure difference between the inside and outside of the aircraft, in addition, the atmospheric turbulence caused by the high-speed flight of the aircraft can also be considered, so it is more troublesome.

Because it avoids the leakage of dirty substances and affects the safety of the aircraft.

The storage pool of the airplane toilet is negative-pressurized.

Because it's an airplane, everything has its own characteristics.