The screw pump is widely used in sewage treatment plants for conveying water, wet sludge and flocculant liquids due to its variable capacity, strong self-priming ability, reversible, and ability to transport liquids containing solid particles. Pump selection should follow the principle of economy, reasonableness and reliability.
The screw pump is widely used in sewage treatment plants for conveying water, wet sludge and flocculant liquids due to its variable capacity, strong self-priming ability, reversible, and ability to transport liquids containing solid particles. Pump selection should follow the principle of economy, reasonableness and reliability. If the design is not well thought out, it will cause trouble for future use, management and maintenance. Therefore, a screw pump that is selected according to actual needs/reasonable and reliable is selected. Can ensure smooth production, but also reduce repair costs.
First, the speed of the screw pump is selected
The flow rate of the screw pump is linear with the rotational speed. Although the high-speed screw pump can increase the flow rate and the lift with respect to the low-speed screw pump, the power is obviously increased. The high rotational speed accelerates the wear between the rotor and the stator, and the screw must be made. The pump fails prematurely, and the fixed rotor length of the high speed screw pump is very short and easy to wear, thus shortening the service life of the screw pump.
Reduce the speed through the reducer or stepless speed regulation mechanism, so that the survey speed can be kept within the reasonable range of less than 300 revolutions per minute. Compared with the high speed screw pump, the service life can be extended several times.
Second, the quality of the screw pump
Nowadays, there are many types of screw pumps on the market. The imported screw pump has reasonable design, excellent material but high price, lack of service, high price of parts and long order period, which may affect the normal operation of production. Domestic production Most of the imitation imported products have different quality. When selecting domestically produced products, we should consider the cost-effective products with low speed, long lead, good transmission parts and long life.
Third, to ensure that debris does not enter the pump body
The solid impurities mixed in the wet sludge will cause damage to the 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 install the pulverizer in front of the pump, and some installations are also installed. The grille or filter screen is used to block debris from entering the screw pump, and the grille should be cleaned in time to avoid blockage.
Fourth, avoid breaking materials
The screw pump must not be allowed to run under the condition of breaking the material. Once the rubber stator is burnt due to the dry friction, the crusher is intact and the grille is smooth. It is one of the necessary conditions for the normal operation of the screw pump. Some screw pumps A shut-off device is also installed on the pump body. When the material is broken, the vacuum pump will stop the screw pump because of the self-priming function of the screw pump.
Fifth, maintain a constant export pressure
The screw pump is a positive displacement rotary pump. When the outlet end is blocked, the pressure will gradually increase, so that the motor load will increase sharply when the predetermined pressure value is exceeded. The load of the transmission machinery related parts will exceed the design value. In the event of motor burnout and broken drive parts, in order to avoid damage to the screw pump, a bypass relief valve is usually installed at the outlet of the screw pump to stabilize the outlet pressure and keep the pump running normally. Article from: http://NewsDetail244T1.html China Hardware Business Opportunity Network http://news.chinawj.com.cn Editor: (Hardware Business Network Information Center) http://news.chinawj.com.cn
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