In the selection of fluid conveying equipment,different working conditions impose vastly different performance requirements on pumps.When dealing with high-viscosity materials,media containing solid particles,or production scenarios requiring frequent maintenance,traditional pump types often struggle to balance efficiency and reliability-this is precisely why cam rotor pumps have gained such widespread application.As a typical representative of positive displacement rotor pumps,cam rotor pumps achieve continuous suction and discharge of media through a pair of synchronously counter-rotating cam rotors that create periodic volume changes within the pump casing.

-Bonve Cam-Type Dual Rotor Pump Structure Diagram-

Core Structure and Component Composition

Cam rotor pumps come with a rich variety of rotor profiles,including two-lobe linear,two-lobe butterfly,three-lobe linear,three-lobe butterfly,and three-lobe helical types.Material options include 42CrMo alloy steel,304 stainless steel,316L stainless steel,2205 duplex stainless steel,904L super stainless steel,and even titanium alloy,adaptable to various corrosion and wear conditions.The quick-access pump cover is secured by several ring nuts,allowing inspection without dismantling the pipelines and significantly reducing maintenance downtime.

The pump casing adopts an integral casting process,optimized through CFD flow field design with ample flow cross-section and smooth flow characteristics,delivering excellent anti-clogging performance and solid-particle passing capability.Four protective wear plates are installed inside the pump casing:the upper and lower curved plates are radial wear plates,while the left and right plates are axial wear plates.The outer axial wear plates can be used on both sides,effectively extending their replacement cycle.The transmission system consists of synchronous gears and two sets of bearings;the gears are manufactured to AGMA Class 9 precision and operate in a lubricated environment to ensure stable transmission.

Working Principle and Operating Characteristics

Equipment operation follows three consecutive stages:as the rotors rotate away from the inlet area,a vacuum is formed and media is drawn into the pump chamber under atmospheric pressure;the rotors continue turning,pushing media along the chamber wall toward the outlet side;the volume in the rotor meshing zone contracts,forcing media out through the discharge port.Metal rotors maintain a designed clearance without contact,and the rotors and pump casing also feature high-precision clearance fitting,balancing sealing effectiveness and friction prevention-this is the technical foundation that enables rotor pumps to withstand short-duration dry running.

Under high-pressure conditions,rotors may experience slight contact due to elastic deformation,and their wear characteristics differ from metal rotors,requiring judgment based on working condition parameters during selection.Thanks to synchronous rotation and maintained clearances,the equipment experiences virtually no rotor wear,can convey media containing solid particles,and will not suffer immediate damage under short-duration feed interruption scenarios.

-Bonve Pump Industry Cam-Type Dual Rotor Pump-

Key Parameters and Performance Boundaries

Flow rate,pressure,rotational speed,viscosity,and self-priming height are the five core indicators for pump selection.Flow rate is essentially proportional to rotational speed;pressure determines conveying distance and resistance-overcoming capability;the viscosity application range reaches up to 1 million centipoise,approaching the consistency level of paste-like materials.The theoretical self-priming height can reach 8 to 9 meters,while in practical engineering applications it is typically 6 to 7 meters,with specific values affected by pipeline losses and media properties.

Comprehensive Advantages and Applicable Limitations

Cam rotor pumps offer four major technical advantages:first,high-viscosity adaptability,handling media up to 2.5 million cP;second,online maintenance capability,allowing seal and rotor replacement without pipeline disassembly;third,low-shear conveying,preserving the structural integrity of sensitive materials;fourth,reversible rotation support,meeting both conveying and cleaning requirements in both directions.

Meanwhile,the equipment has three limitations:the initial procurement cost is relatively high,typically exceeding that of screw pumps for the same specifications;for ultra-pure clean media scenarios,centrifugal pumps offer better economic efficiency;and there is an upper limit to the solid content rate,with special customization required beyond the conventional range.Currently,this type of pump is widely used in sludge conveying in sewage treatment,transfer of viscous materials in food and beverage,production of shear-sensitive products in pharmaceutical and daily chemical industries,as well as conveying coatings,resins,and lithium battery slurries in the chemical and new energy sectors.

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.