Sewage suction truck is a kind of environmental sanitation vehicle. It has the advantages of self-priming and self-discharging, fast working speed, convenient transportation, etc. It is mainly used for sewage suction, loading and unloading, and plays an important role in the sanitation work in urban areas. Function, the sewage suction truck is mainly composed of two parts, a special chassis for environmental sanitation and an upper garment. There is an important accessory in the upper garment, which is the sewage suction pump. The sewage suction and discharge operation of the sewage suction truck depends on it. Today we will take a look this accessory.

Working principle of the sewage suction pump: The main power of the sewage suction pump comes from the engine. The engine is transmitted to the vacuum pump through the gearbox, power take-off, and drive shaft. When the sewage suction works, the vacuum pump draws out the air in the sealed tank to form negative pressure. The atmospheric pressure outside the tank presses the dirt into the tank through the suction pipe. When the sewage is discharged, the vacuum pump pushes the atmospheric pressure outside the tank into the tank, and uses the air pressure to discharge the dirt out of the tank.

There are two most commonly used sewage suction pumps for sewage suction trucks, one is a vacuum oil pump, and the other is a water circulation pump.

Vacuum oil pumps are also called rotary vane vacuum pumps, which are rough vacuum pumps and can be used alone or as a front aid for other advanced vacuum pumps or ultra-advanced vacuum pumps. Let's introduce the characteristics of this vacuum pump.

1. Relatively high vacuum;

2. The gas compression in this vacuum pump is is othermal. Because there is no exhaust valve and friction surface, it can extract dusty gas, condensable gas and steam-water mixture. These outstanding features make it widely used;

3. The structure is simple, and the production technical precision is not high;

4. Equipped with pump stop anti-oil return device, easy to start again;

5. The exhaust port is equipped with an oil mist trap to avoid environmental pollution;

6. It can maintain high speed under low pressure

The water circulation pump is relatively expensive. Its working principle is: the blades are eccentrically installed in the pump body, and an appropriate amount of water is installed in the pump body as the working fluid. When the blades rotate, the water in the pump body is thrown around by the impeller. Due to the centrifugal effect, the water will form a closed water ring similar in shape to the pump cavity. The water ring pump relies on the volume change of the pump cavity to achieve suction, compression and exhaust, thereby completing the suction and discharge of the sewage suction truck. Unloading operations. Its use has the following advantages:

1. Long service life, small size, high working efficiency and stable operation;

2. No carbon brush, no pollution, electronic commutation;

3. The pump body adopts high-performance ceramic shaft with high precision and good wear resistance.