Sewage truck is a kind of sanitation vehicle. It has the advantages of self-priming and self-draining, fast working speed, convenient transportation, etc.
The sewage truck is mainly composed of two parts: the special chassis for sanitation and the upper body. Today, Xiaobian will take you to understand the working principle of the sewage truck.
The working principle of the sewage pump:
The main power of the sewage suction pump comes from the engine, which is transmitted to the vacuum pump through the gearbox, power take-off and driveshaft;
During the sewage suction operation, the vacuum pump draws out the air in the sealed tank to form a negative pressure, and uses the atmospheric pressure outside the tank to press the sewage into the tank through the sewage 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 trucks, one is a vacuum oil pump and the other is a water circulation pump.
The vacuum oil pump is also called a rotary vane vacuum pump, which belongs to a low vacuum pump and can be used alone or as a front auxiliary for other advanced vacuum pumps or super-advanced vacuum pumps.
Let’s introduce the characteristics of this vacuum pump.
- The degree of vacuum is relatively high;
- The gas compression in this vacuum pump is isothermal. Since there is no exhaust valve and friction surface, it can pump out dusty gas, condensable gas and soda-water mixture. These outstanding features make it widely used;
- The structure is simple, and the technical precision of production is not high;
- Equipped with an anti-oil-return device for stopping the pump, which is convenient for restarting;
- The exhaust port is equipped with an oil mist trap to avoid environmental pollution;
- Can maintain high speed under low pressure; The water circulation pump is relatively expensive, and its working principle is:
The vanes 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 vanes 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 realizes suction, compression and exhaust by the volume change of the pump cavity, thus completing the suction and discharge of the sewage suction truck. Operation.
Its use has the following advantages:
- Long service life, small size, high working efficiency and stable operation;
- No carbon brush, no pollution, electronic commutation;
- The shaft of the pump body adopts high-performance ceramic shaft, which has high precision and good wear resistance.
The above is the knowledge explanation of the sewage suction truck, I hope it can help you!