In the field of industrial fluid transportation, the transportation of high-viscosity, particle-containing and shear-sensitive media has always been a pain point in the industry. Positive displacement pumps have become the mainstream choice due to their characteristics of stable flow rate and strong adaptability. As an important branch of positive displacement pumps, rotary pumps have derived various forms such as gear pumps, screw pumps and lobe rotor pumps. Lobe rotor pumps, with their unique structural design, exhibit comprehensive performance far superior to ordinary rotary pumps under harsh working conditions.

- Bonve Pumps Cam Type Twin Rotor Pump -

In terms of core structure, ordinary rotary pumps cover various forms such as gears, screws and vanes, mostly adopting built-in gear drive or direct drive, and there are usually extremely small gaps between rotors. In contrast, lobe rotor pumps adopt external synchronous gearbox transmission to drive a pair of synchronously counter-rotating cam-type rotors. Extremely small non-contact gaps are maintained between the rotors and between the rotors and the pump casing, which fundamentally changes the material handling capacity and service life of the pump.

In terms of basic performance, the flow range of both can reach 0.2~500 m³/h, and the flow rate of large-scale equipment is even higher. The applicable viscosity covers 1~2,500,000 cP, and the temperature range is -30℃~+300℃. Both have the characteristics of stable and pulsation-free flow and reversible rotation. However, lobe rotor pumps have obvious advantages in key indicators: their maximum outlet pressure can reach 1.2 MPa, which is higher than the conventional range of 0.6~1.2 MPa for ordinary rotary pumps; their self-priming height can reach 8~9 meters of water column, and the vacuum degree is significantly better than the 5~8 meters of water column of ordinary rotary pumps. The volumetric efficiency can still remain above 90% when transporting high-viscosity media.

Material transportation adaptability is the most core difference between the two. Due to the non-contact operation of the rotors, lobe rotor pumps have extremely low shear force, with a damage rate of less than 2% for soft particles with a diameter of less than 10 mm. They can effectively protect materials containing active ingredients or fragile particles, and can transport particle media with a maximum diameter of 5~30 mm. At the same time, they have better adaptability to gas-liquid mixed transportation. In terms of hygiene level, the internal flow channel of lobe rotor pumps is smooth without dead ends, supports Clean-in-Place (CIP) and Sterilize-in-Place (SIP), and fully meets pharmaceutical-grade and food-grade requirements. When matched with materials such as 316L, duplex steel and Hastelloy, they can also efficiently transport various highly corrosive and high-viscosity media.

To sum up, the core advantages of lobe rotor pumps are concentrated in three points: first, the low shear and low wear characteristics brought by external synchronous gear drive, and the replacement cost of wearing parts is lower than that of ordinary rotary pumps; second, higher self-priming capacity and discharge pressure, which are suitable for long-distance and high-lift transportation conditions; third, strong adaptability to hygienic-grade, corrosive high-viscosity and particle-containing media, which can solve the industry pain points that ordinary rotary pumps are difficult to handle. These advantages make them widely used in food and beverage, pharmaceutical and chemical, environmental protection, petrochemical and other industries, and can stably transport various complex media such as jam, ointment, crude oil and resin.

During engineering selection, key considerations include medium viscosity, solid content, corrosivity, hygiene level and flow pressure requirements. In daily maintenance, attention should be paid to common faults such as flow rate drop, abnormal noise and seal leakage. Regularly replace gear oil, check rotor wear, and strictly prohibit dry running and hard abrasives entering the pump body, otherwise it will cause damage to the equipment.

Ordinary rotary pumps can meet the transportation needs of clean, low-abrasive, medium and high-viscosity media with lower initial procurement cost. However, in the face of harsh working conditions such as hygienic requirements, particle-containing or corrosive high-viscosity materials, lobe rotor pumps are a better choice due to their lower full life cycle cost and more stable operation performance.

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.  

Service Hotline: 0574-87588986 13586591794  

Official Website: www.bvpumps.com  

Business Email: market@bonvepumps.com  

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