In industrial production, fluid transport is a fundamental operation breakthrough across numerous process stages. Different media exhibit vastly different physical and chemical properties, imposing stringent demands on conveying equipment. Cam pumps, by virtue of their unique design concept and outstanding performance, have been widely adopted in many industries.

-Bonve Cam-type Twin Rotor Pump-

The essence of any pump is to convert electrical or mechanical energy into kinetic energy of the fluid, and different pump types employ fundamentally distinct conversion methods. As a type of positive displacement pump, the cam rotor pump is designed around the core principle of “chamber displacement.” Driven by a synchronous gearbox, a pair of rotors rotate in opposite directions, remaining in mesh but without contact. A continuously expanding working chamber is formed at the suction end; the medium enters this chamber, is rigidly conveyed to the outlet as the rotors turn, and is finally squeezed out by the closing chamber to form a stable pressure flow.

This design creates three core advantages. The volumetric entrapment characteristic makes the volume change of the working chamber rigid, with a fixed volume of fluid delivered per revolution. Therefore, the flow rate is determined solely by the product of rotational speed and chamber volume, and is essentially independent of the discharge back pressure—this is the most fundamental feature of a positive displacement pump. The non-air-binding characteristic differs from centrifugal pumps that rely on centrifugal force to throw liquid out; cam pumps physically push the medium forward by means of the chamber. Even when the medium contains a large amount of gas, such as gas-liquid two-phase flow or air slugs during tank unloading, the working chamber can still effectively propel the medium without cavitation-induced flow interruption. The low-shear conveying capability comes from the rotors rotating smoothly at a low speed, typically 200–600 rpm, exerting minimal shear stress on the fluid, making them especially suitable for conveying shear-sensitive materials like jam, yogurt, and pharmaceutical liquids.

The cam rotor pump is mainly composed of three key components. The rotor is the core moving part, forming the working chamber and propelling the medium. Rotors can be classified by lobe number into single-lobe, two-lobe, three-lobe, and multi-lobe; by helix angle into helical and straight types; and by material into metal rotors and rubber-covered rotors. The synchronous gearbox adopts an external design, driving the two rotors in synchronized opposite rotation to ensure operational accuracy, and typically consists of a high-strength cast iron gear case, helical gears, and heavy-duty bearings. The shaft sealing system prevents medium leakage and isolates the pump chamber from the outside, mainly including mechanical seals and gland packing. Some models use a cartridge assembly, allowing rotor clearance adjustment without dismantling the gearbox.

Cam-type rotor pumps are usually manufactured in graded series such as food grade, chemical grade, and general-purpose grade. Core components and sealing devices are selected from different materials and forms according to the characteristics of the medium to satisfy various process requirements. The industry standard JB/T 13974-2020 was officially implemented on April 1, 2021, marking the further improvement of the industrial manufacturing standard system for cam rotor pumps in China. Inside the pump chamber, precise clearances are maintained between all mating parts, with no contact and no wear, effectively reducing operating noise and extending the overall service life. All parts in contact with the medium are mostly made of high-quality stainless steel, such as SUS304, AISI316, and 316L, conforming to hygienic standards.

By virtue of their unique design principles and excellent performance, cam rotor pumps hold an important position in the field of fluid transport. Their positive displacement conveying characteristics, non-air-binding capability, and low-shear advantages enable them to handle a wide variety of complex media transport tasks, providing reliable fluid transfer solutions for 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.  

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.