Industrial production involves fluid media with vastly different characteristics, ranging from large-particle slurries to high-viscosity polymers, from corrosive chemical raw materials to shear-sensitive food materials, which impose diverse and stringent requirements on conveying equipment. The core reason cam rotor pumps stand out among numerous pump types lies in their complete classification system and targeted structural design, which can accurately match the needs of various complex industrial working conditions. As an important branch of positive displacement rotor pumps, their classification mainly revolves around three core dimensions: blade count, rotor materials and special structural designs.

-Bonve Cam-type Twin Rotor Pump-

Classification by blade profile count is the most fundamental categorization method. Single-blade rotors are designed for materials with large particles like whole fruits and coarse slurries, featuring the lowest particle breakage rate, but suffer from large flow pulsation, low pressure and small displacement, making them rarely used in engineering. Two-blade rotors apply to small/medium particle materials and poor-fluidity media, with relatively low breakage rate and slight pulsation, and their displacement capacity is smaller than three-blade rotors. Three-blade rotors are the most widely used type, boasting the largest displacement and comprehensive performance superior to single and two-blade models, and are insensitive to impurities, suitable for high-viscosity, high-concentration and particle-laden materials. Multi-blade rotors serve scenarios requiring extremely high conveying stability; as blade count increases, displacement decreases while pulsation diminishes, but they tend to break particles and are unsuitable for high-solid-content media.

Rotor materials directly determine the service life and working condition adaptability of the equipment, with significant performance gaps between metal and rubber rotors. Metal rotors are commonly made of 304/316L stainless steel, duplex steel and QT450 cast iron, with relatively low manufacturing costs, but perform poorly in dusty or harsh chemical environments. The non-contact fit between metal rotor and pump chamber results in weak self-priming capability, high leakage, low volumetric efficiency and limited outlet pressure. Rubber rotors leverage rubber's high elasticity to form an interference fit with the pump chamber, drastically improving self-priming performance and volumetric efficiency. They also possess excellent wear and corrosion resistance, support long-time dry running, and are widely applied in oilfields, pharmaceuticals, sewage treatment and other industries.

Different rubber materials are tailored for specific media: Nitrile rubber (NBR) exhibits excellent oil and wear resistance, making it suitable for clean water, domestic sewage and other simple media. Ethylene propylene diene monomer (EPDM) resists alcohols, cleaning agents and polar solvents, and has good heat and aging resistance. Fluororubber (FKM) adapts to complex conditions like crude oil, seawater and chemical media, with superior corrosion and high temperature resistance. Perfluoroelastomer boasts the best chemical resistance performance but comes with a very high price tag.

In terms of structural design, helical rotors eliminate inherent conveying pulsation through a special helical angle design, achieving nearly zero pulsation output. Most mainstream cam pumps adopt a three-blade helical full rubber coating design, which enhances vacuum degree, wear and corrosion resistance, and effectively reduces flow/pressure pulsation and pump body vibration.

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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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.