When the eccentric rotor of the vacuum pump of the dung suction truck rotates, the rotating blades slide close to the inner wall of the pump under the action of centrifugal force, and the volume of the suction working chamber gradually increases, and the sucked gas is sucked into it until the rotating blades turn to suck, and the sucked gas is isolated. As the rotor continues to rotate, the isolated gas is gradually compressed and the pressure increases. When the pressure exceeds the pressure of the exhaust port, the gas is exhausted from the pump. In this way, the vacuum pump of the dung suction car circulates repeatedly, pumping up the air in the container, forming a vacuum dung suction car. The function of the vacuum pump is to pump out the air in the cylinder of the sewage suction vehicle, so that the cylinder is in a vacuum state. When you suck something, because the jar is vacuum, naturally dirty things will be sucked into the jar.
Source of information: Dongguan Shoupu Electromechanical Co., Ltd.