The flow rate of the three-screw pump is linear with the speed. Compared with the low-speed screw pump, the high-speed screw pump can increase the flow rate and lift, but the power is obviously increased. The high speed accelerates the wear between the rotor and the stator. The screw pump is prematurely disabled, and the high-speed screw pump has a short stator length and is extremely wearable, thereby shortening the service life of the screw pump.
The speed is reduced by the reducer or the stepless speed regulation mechanism, so that the surveying 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 the high speed running screw pump. At present, there are many kinds of screw pumps on the market. Relatively speaking, the imported screw pump has reasonable design and excellent materials, but the price is high, the service is not in place, the price of accessories is high, and the order period is long, which may affect the normal production. run.
Most of the domestically produced products are imitation imported products, and the quality of the products is mixed. When selecting domestically produced products, when considering the cost performance, the products with low speed, long lead, good transmission parts and long service life are selected.
First of all, we must ensure that the sundries do not enter the pump body. The solid impurities mixed in the wet sludge will cause damage to the metal Rubber material stator of the screw pump, so it is very important to ensure that the debris does not enter the pump cavity. Many sewage plants A pulverizer is installed in front of the pump, and some grilling devices or screens are installed to block debris from entering the screw pump. The grille should be cleaned in time to avoid clogging.
Secondly, to maintain a constant outlet pressure, the screw pump is a positive displacement rotary pump. When the outlet end is blocked, the pressure will gradually increase, so that the predetermined pressure value is exceeded. At this time, the motor load increases sharply. The load will also exceed the design value, and in severe cases, the motor will burn out. The transmission parts are broken. In order to avoid damage to the screw pump, a bypass relief valve is usually installed at the outlet of the three-screw pump to stabilize the outlet pressure and keep the pump running normally.
Finally, to avoid material breakage, the three-screw pump must not be allowed to run under the condition of material breakage. Once it happens, the rubber stator burns due to dry friction and instantaneously generates high temperature. Therefore, the crusher is intact and the grille is smooth. One of the necessary conditions, for this reason, some screw pumps are also equipped with a material shut-off device on the pump body. When the material is broken, due to the self-priming function of the screw pump, a vacuum will be generated in the cavity, and the vacuum device will cause the screw. The pump stops running.
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Label: Three screw pump work precautions
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1) Quick-latch adapter is designed to offer easier, faster and safer makeup for casing;
2) Be able to couple with two plugs simultaneously, simplifying cementing operation and preventing cement pollution;
3) Positive lever indicates plug releasing;
4) Balance pipe is developed.
Puyang Junhong Rubber Co., Ltd. , https://www.pyjhxs.com