The sewage suction truck is a type of sanitation vehicle. It has the advantages of self-suction and self-discharge, fast working speed and convenient transportation. It is mainly used for the suction, loading and unloading of sewage in sewers and plays an important role in the sanitation work in urban areas. The sewage suction truck is mainly composed of two major parts: the special chassis for sanitation and the upper body. There is an important accessory in the upper body, which is the sewage suction pump. The sewage suction and discharge operation of the sewage suction truck is entirely dependent on it. Today, let's take a look at this accessory.

The working principle of the sewage suction pump The main power source of the sewage suction pump comes from the engine. The engine transmits the power to the vacuum pump through the transmission, power take-off and drive shaft. During the sewage suction operation, the vacuum pump extracts the air in the sealed tank to create a negative pressure. By using the atmospheric pressure outside the tank, the sewage is forced into the tank through the sewage suction pipe. During the sewage discharge process, the vacuum pump brings the atmospheric pressure outside the tank into the tank and uses the air pressure to expel the sewage outside the tank.
There are two most commonly used types of sewage pumps for sewage suction trucks: one is the vacuum oil pump, and the other is the water circulation pump.

The vacuum oil pump, also known as the rotary vane vacuum pump, is a low vacuum pump that can be used independently or as an auxiliary to other advanced vacuum pumps or ultra-advanced vacuum pumps. Now let's introduce the features of this type of vacuum pump.

The vacuum degree is relatively high;

2. In this type of vacuum pump, gas compression is isothermal. Due to the absence of exhaust valves and friction surfaces, it can extract dusty gas, condensable gas and steam-water mixtures. These outstanding features have made it widely used.

3. The structure is simple and the technical precision requirements for manufacturing are not high.

4. It is equipped with a pump stop and oil return prevention device, making it convenient to restart.

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

6. It can still maintain a high rotational speed under low pressure.
The water circulation pump is relatively expensive. Its working principle is: The blades are eccentrically installed in the pump body, which is filled with an appropriate amount of water as the working fluid. When the blades rotate, the water in the pump body is thrown to the periphery by the impeller. Due to the centrifugal force, a closed water ring similar in shape to the pump cavity is formed. The water ring pump achieves suction, compression and exhaust by the change in the volume of the pump cavity, thereby completing the suction and discharge operations of the sewage suction truck. Its use has the following advantages:
1. Long service life, small size, high working efficiency, and stable operation;

2. Brushless, pollution-free, and electronic commutation;

3. The pump body shaft center adopts a high-performance ceramic shaft, which features high precision and good wear resistance.

The above is the knowledge explanation of the sewage suction pump of the sewage suction truck. I hope it can be helpful to everyone!