As the core technology of rotor pump, the first primary function of the rotor profile is to form a sealed and variable-volume chamber during the continuous meshing operation of the rotor pair. Therefore, the curvature characteristics of the profile affect sealing properties and volume efficiency. The rate of volume change in the rotor chamber affects pump suction and discharge efficiency, cavitation, hydraulic vibration etc. The second primary function of the profile is to establish torque transmission and motion transmission between the inner and outer rotor, determining contact stress, friction wear life, mechanical vibration and noise, mechanical efficiency, and other indicators.
The widely adopted Gerotor profile in the industry has a history of over a century. There have been few new rotor profiles introduced in the past century, and the few variations are simple modifications of the Gerotor profile. This is because the conjugate solution algorithm is complex, and the simplest circular arc as the base curve function algorithm has been used due to its simplicity. While the circular arc profile is easy to solve, its sealing and driving characteristics are often contradictory, and its space efficiency is low, posing a significant obstacle to further improving rotor pump performance.
The composite integral algorithm (Cotegral® Algorithm) developed by APT breaks through the barriers of traditional profile solutions, enabling the conjugate solution based on complex and segmented curves as base functions. Compared to rotor profiles generated with a traditional circular arc base, the new series of rotor profiles based on the Composite Integral Algorithm can be highly flexible in multi-parameter optimization. Depending on actual working conditions and technical requirements, customization of volume efficiency, drive angle, drive curvature, sealing range, sealing curvature, etc., can be done as needed. This allows rotor pumps to achieve better hydraulic performance, transmission performance, and reliability.
The rotor profile types developed by APT are illustrated in the above images, with various profile types maturely applied in the automotive and aviation industries. APT can also customize entirely new specialized profiles according to customer-specific requirements or specific technical needs.