In many industrial scenarios such as chemical, food and papermaking, the conveyance of high-viscosity media and fluids with solid particles has always been a core pain point. Rotary lobe pumps, with their high-precision clearance fit structural design, have strong self-priming capacity and high lift force, operate stably and are not easy to block, making them the preferred equipment for such working conditions. Many front-line operators do not have a deep understanding of their basic use specifications, which is easy to cause unnecessary equipment failures. The following sorts out their core practical knowledge.

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The installation link directly determines the service life and operation reliability of the equipment. The maximum self-priming height of rotary lobe pumps can reach 9m. To avoid cavitation risk, the flooded suction installation method can be preferentially adopted; if self-priming is necessary, the suction lift should be reduced as much as possible, and the net positive suction head available of the device should be at least 0.5m higher. When the suction lift exceeds 5m, a check valve must be installed at an appropriate position of the inlet pipeline; when conveying gaseous media, an exhaust valve should be installed on the pipeline close to the pump body to prevent bubbles from entering the pump chamber and affecting operation. Rubber flexible joints or bellows joints should be installed between the pump flange and the system pipeline to eliminate the additional stress caused by pipeline vibration and thermal expansion and contraction, ensuring that the pump inlet flange does not bear any system load. At the same time, sufficient maintenance space should be reserved in front of the pump cover to facilitate subsequent rotor replacement and maintenance; coupling alignment must be corrected before starting the pump, it is strictly forbidden to start the equipment in a misaligned state, and the pump body must be fixed on a flat base.

Daily maintenance is the key to ensuring the long-term stable operation of the equipment. It is necessary to regularly check the lubricating oil quality, maintain a good lubrication state, and extend the service life of gears and bearings; inspect the operation status of the pump daily, and stop the machine immediately for troubleshooting when abnormal noise, vibration or excessive temperature rise occurs. Before maintenance, the inlet and outlet valves must be closed, and the drain valve must be opened to empty the liquid in the pump chamber to prevent pressurized liquid from hurting people. If the pump body vibration and abnormal noise intensify, it is mostly caused by coupling misalignment or excessive load; after the motor stops due to failure, power off first for inspection. If the operation process is correct, it can be preliminarily judged as a mechanical failure. If scratches are found on the cams and the chamber wall after opening the pump cover, the fit clearance should be checked first. When reassembling the pump body and the gearbox, the coupling coaxiality must be corrected again.

Speed matching needs to be combined with the working condition characteristics. The working speed of positive displacement rotary lobe pumps is usually controlled between 100-500rpm, which can be flexibly adjusted according to the viscosity and abrasiveness differences of the conveyed media. In terms of flow regulation, the flow control can only be achieved by adjusting the speed through a variable frequency motor. It is absolutely forbidden to throttle by closing the outlet valve, otherwise the pipeline will burst due to the sudden rise of system pressure.

Rotary lobe pumps fully support long-term continuous operation state. As a type of positive displacement pump, the design structure between rotors and between rotors and pump chamber will not cause obvious performance degradation during long-term operation. Moreover, the equipment has a simple structure and is convenient for maintenance, which can fully meet the needs of continuous operation of industrial production.

Bonve pump always adheres to the philosophy of "Wholeheartedly Making Good Rotor Pumps," committed to providing global customers with customized conveying and mixing solutions. If you have technical inquiries, selection needs, case references, or other cooperation intentions related to Bonve rotor pumps, please feel free to contact us.  

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We look forward to working with you to drive efficiency and innovation in industrial fluid transmission with precision technology.