Due to its variable capacity, self-priming ability, reversible, and ability to transport liquids containing solid particles, screw pumps are widely used in sewage treatment plants for conveying water, wet sludge and flocculant liquids. . The selection of screw pump should follow the principle of economy, reasonableness and reliability. If the design and selection are not well thought out, it will bring trouble to the future use, management and maintenance. Therefore, choosing a screw pump that is reasonable and reliable according to actual production needs can ensure smooth production and reduce repair costs. Now we will introduce some of the experiences in the application of screw pumps as follows:
First, the speed of the screw pump is linear with the flow rate of the screw pump. 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, and the high speed accelerates the rotor and The wear between the stators must cause the screw pump to fail prematurely, and the rotor of the high-speed screw pump has a short stator length and is extremely easy to wear, thus shortening the service life of the screw pump.
The speed is reduced by the speed reduction mechanism or the stepless speed regulation mechanism, and the rotation speed is maintained within a reasonable range of less than three hundred revolutions per minute. Compared with the high speed running screw pump, the service life can be extended several times.
Second, the quality of the screw pump There are many types 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 the accessories is high, and the order period is long. May affect the normal operation of production.
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.
Third, to ensure that debris does not enter the pump body wet sludge mixed solid debris will cause damage to the rubber material of the screw pump stator, so it is very important to ensure that debris does not enter the pump cavity, many sewage plants in front of the pump A pulverizer is installed, and some grilling devices or screens are installed to block the inclusion of debris into the screw pump. The grille should be cleaned in time to avoid clogging.
4. Avoiding the breakage of the screw pump is never allowed to run under the condition of breaking the material. Once the rubber stator is dry and rubbed, it will burn out at high temperature for a moment. Therefore, the crusher is intact and the grille is smooth. It is necessary for the screw pump to operate normally. One of the conditions, for this reason, some screw pumps also have a material shut-off device installed 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 stop the screw pump. Running.
V. Maintaining 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 of the parts related to the transmission machinery will also exceed the design value. In severe cases, the motor will burn out and the transmission parts will break. 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.
First, the speed of the screw pump is linear with the flow rate of the screw pump. 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, and the high speed accelerates the rotor and The wear between the stators must cause the screw pump to fail prematurely, and the rotor of the high-speed screw pump has a short stator length and is extremely easy to wear, thus shortening the service life of the screw pump.
The speed is reduced by the speed reduction mechanism or the stepless speed regulation mechanism, and the rotation speed is maintained within a reasonable range of less than three hundred revolutions per minute. Compared with the high speed running screw pump, the service life can be extended several times.
Second, the quality of the screw pump There are many types 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 the accessories is high, and the order period is long. May affect the normal operation of production.
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.
Third, to ensure that debris does not enter the pump body wet sludge mixed solid debris will cause damage to the rubber material of the screw pump stator, so it is very important to ensure that debris does not enter the pump cavity, many sewage plants in front of the pump A pulverizer is installed, and some grilling devices or screens are installed to block the inclusion of debris into the screw pump. The grille should be cleaned in time to avoid clogging.
4. Avoiding the breakage of the screw pump is never allowed to run under the condition of breaking the material. Once the rubber stator is dry and rubbed, it will burn out at high temperature for a moment. Therefore, the crusher is intact and the grille is smooth. It is necessary for the screw pump to operate normally. One of the conditions, for this reason, some screw pumps also have a material shut-off device installed 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 stop the screw pump. Running.
V. Maintaining 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 of the parts related to the transmission machinery will also exceed the design value. In severe cases, the motor will burn out and the transmission parts will break. 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.
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