The screw pump has small flow and pressure pulses, little noise and vibration, and self-priming capability, but screw machining is difficult. Therefore, selection requires certain knowledge.
First, the speed of the screw pump selection screw pump flow and speed linear relationship, compared to low speed screw pump, high speed screw pump can increase the flow and head, but the power is significantly increased, the high speed speed up the rotor and Abrasive wear between the stators will definitely lead to premature failure of the screw pump, and the fixed rotor length of the high-speed rotary screw pump is very short and it is easy to wear, thus shortening the service life of the screw pump.
By reducing the speed through a speed-reducing mechanism or a stepless speed-regulating mechanism, the speed is kept within a reasonable range of less than three hundred revolutions per minute, and the service life can be extended several times compared with a high-speed screw pump.
Second, the quality of the screw pump There are many types of screw pump on the market, relatively speaking, the imported screw pump design is reasonable, excellent material, but the price is higher, some services are not in place, accessories, high prices, long order period , may affect the normal operation of production.
Most of the domestic production of imitation of imported products, product quality varies greatly, in the selection of domestic production of products, when considering its cost-effective, choose low-speed, long lead, transmission components, material quality, long life rating of the product.
Third, to ensure that debris does not enter the pump wet sludge mixed with solid debris will damage the rubber pump stator stator, so to ensure that debris does not enter the pump cavity is very important, many sewage treatment plant in front of the pump The pulverizer is installed, and some grid devices or screens are installed to prevent debris from entering the screw pump. The grid should be cleared in time to avoid clogging.
According to the different bearing series and sizes, there are two different designs. The seal ring is made of stamping steel, usually with a cylindrical extension at the inner diameter of the sealing ring, forming a long sealing gap with the inner ring shoulder. Some seals do not extend.
Bearing with low friction seal ring: the suffix is RSL, 2RSL or RZ, 2RZ, according to different bearing series and size, it also has different structural design.A very narrow gap to form a cylindrical surface or the inner concave contour of the sealing ring and the inner ring shoulder, is actually not contact, therefore, a low friction bearing seal and bearing with Z can run the dustproof cover at the same speed, but its better sealing performance.
Bearing with contact seal ring, the suffix is RSH, 2RSH or RS1, 2RS1
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