The screw pump is equipped with a speed-regulating motor for variable delivery, strong self-priming ability, reversibility, and the ability to transport liquids containing solid particles. It is widely used in sewage treatment plants and chemical companies to transport sludge and flocculant drugs. Liquid aspect. The selection of screw pump should follow the principle of economy and rationality. If you don't think carefully about the selection, it will cause troubles for future use and management. Therefore, choosing a reasonable screw pump according to the actual needs of production can ensure smooth production and reduce repair costs.
1. Selection of the speed of the screw pump
The flow rate of the screw pump has a linear relationship with the speed. Compared with the low-speed screw pump, the high-speed screw pump can increase the flow rate and head, but the power is significantly increased. The high speed accelerates the wear between the rotor and the stator, which must make The screw pump fails prematurely, and the stator and rotor length of the high-speed screw pump are very short, which is easy to wear, thus shortening the service life of the screw pump.
The rotation speed is reduced by a reduction mechanism or a stepless speed regulation mechanism, so that the rotation speed is kept within a reasonable range below 300 revolutions per minute. Compared with a high-speed screw pump, the service life can be extended several times.
2. Material of single screw pump
Since the screw pump is mostly used in sewage and chemical enterprises, it is required to have good corrosion resistance. At present, the material of the screw pump produced by our company includes shaft stainless steel and overall stainless steel. The stainless steel material is 304, 316 and 316L.
3. Ensure that debris does not enter the pump body
The solid debris mixed in the sludge will cause damage to the rubber stator of the screw pump. Many sewage plants have installed pulverizers in front of the pump, and some have installed grille devices or screens to prevent debris from entering the screw pump. The grid should be cleared in time to avoid clogging. When the screw pump makes abnormal noise, please stop the pump for inspection and cleaning to ensure the long-term stable operation of the pump.
4. Avoid material breakage
The single-screw pump is never allowed to run under the condition of material cut-off. Once it happens, the rubber stator will burn out due to dry friction and high temperature in an instant. Therefore, the pulverizer is intact and the grid is unblocked. It is one of the necessary conditions for the normal operation of the screw pump. For this reason, some screw pumps are also equipped with a material cut-off stop device on the pump body. When the material is cut off, due to the self-priming function of the screw pump, a vacuum will be generated in the cavity, and the vacuum device will stop the screw pump from running.
5. Keep the outlet pressure stable
The single screw pump is a positive displacement rotary pump. When the outlet port is blocked, the pressure will gradually increase, so that it exceeds the predetermined pressure value. At this time, the motor load increases sharply. The load on the relevant parts of the transmission machinery will also exceed the design value, and the motor may burn out and the transmission parts may break. In order to avoid damage to the screw pump, a bypass relief valve is generally installed at the outlet of the screw pump to stabilize the outlet pressure and maintain the safe operation of the pump.
https://www.wxxjyby.com/