In the field of industrial fluid transfer, the rotary pump is often referred to as the "rubber-bellied porter" on the production line. Unlike common vane pumps or piston pumps, it does not rely on intense squeezing to move the medium. Instead, it employs a special rotating rotor to smoothly cradle and transfer the liquid, making it particularly adept at handling viscous, impurity-containing, or shear-sensitive products.

（Bonve Cam Rotor Pump）

The core of the rotary pump lies in a pair of uniquely shaped cam-type rotors that mesh and rotate within the pump casing. The working process can be divided into three steps: when the rotors gradually separate on the suction side, an expanding space forms between them and the pump casing, generating suction to draw in the liquid; subsequently, the liquid is enclosed in the cavity formed by the rotors and the pump casing and is transported toward the outlet as the rotors rotate; upon reaching the discharge port, the rotors re-mesh, reducing the cavity volume and steadily expelling the liquid. This process causes almost no damage to the fluid, hence its vivid nickname, "rubber-bellied porter."

Its advantages are particularly notable:  

Firstly, it is not picky about the medium, easily transferring high-viscosity fluids such as asphalt and syrup, as well as particle-laden wastewater, slurries, or sensitive food-grade liquids, thanks to its internal clearance that prevents clogging. Secondly, the transfer process is smooth and continuous, with minimal flow fluctuations. Additionally, the rotary pump has a strong self-priming capability, enabling quick startups, and allows for the interchange of inlet and outlet functions by reversing the rotor direction, facilitating process adjustments. More importantly, due to its gentle transfer action with very low shear, it is highly suitable for handling delicate substances like cosmetics and fruit juices.

（Exploded View of Bonve Rotor Pump）

However, it also has clear limitations:  

The output pressure of a rotary pump is generally not very high, making it suitable for medium-to-low pressure applications but unsuitable for high-pressure demands. Moreover, it must never run dry, as the rotors and casing rely on the medium for lubrication and cooling—dry operation can quickly cause wear and seizure. Due to the clearance between the rotors, some internal leakage is inevitable, resulting in lower volumetric efficiency compared to piston pumps. When handling high-viscosity media, it is also necessary to control the rotational speed to avoid insufficient filling, which could affect suction efficiency.

In practical applications, the rotary pump is like a reliable veteran worker who can handle all sorts of tough and dirty jobs but must be "fed well before working." It is widely used in industries such as chemical, food, pharmaceutical, and shipbuilding, specializing in handling special media like lubricants, paints, medicinal liquids, and slurries. The key to maintenance lies in strictly preventing dry running and regularly inspecting for wear, especially when the medium contains particles, as enlarged clearances can reduce efficiency.

Bonve 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.