Shape Design
Contour Curve: The contour curve of the cam rotor generally adopts a special curve design, such as a cycloid, an arc, or a combination of multiple curves. The cycloid contour curve enables the rotor to achieve a relatively smooth motion during the rotation process, reducing pulsation and vibration, thus realizing low-shear conveying. It avoids damage to the pulp particles and other components in the strawberry jam, and better maintains the original structure and taste of the strawberry jam.
Blade Shape: The blades on the rotor are usually in the shape of a helix or an involute. The helical blades can generate an axial thrust during the conveying process, which helps to smoothly push the strawberry jam from the inlet to the outlet. At the same time, it can also increase the contact area between the rotor and the strawberry jam, improving the conveying efficiency. The involute-shaped blades have good meshing performance, can form a better seal with the inner wall of the pump casing, and reduce the leakage of strawberry jam.
Size Design
Diameter and Length: The diameter and length of the cam rotor need to be determined according to the flow rate and pressure requirements of the pump, as well as the overall structure of the pump body. Generally speaking, a pump with a larger flow rate requires a rotor with a larger diameter and length to increase the volume of the sealed chamber, thereby improving the conveying capacity. At the same time, the size of the rotor also needs to take into account the fit clearance with the pump casing to ensure normal operation under different working conditions.
Blade Thickness: The blade thickness should comprehensively consider the strength and stiffness of the rotor, as well as the characteristics of the strawberry jam. For pumps used to convey high-viscosity strawberry jam, the blade thickness is usually appropriately increased to withstand greater pressure and shear force, preventing the blades from deforming or being damaged during operation. However, the blade thickness should not be too large, otherwise it will increase the weight and moment of inertia of the rotor, affecting the starting and operating performance of the pump.
Material Selection
Stainless steel cam rotors usually use food-grade stainless steel materials, such as 304 stainless steel or 316 stainless steel. 304 stainless steel has good corrosion resistance and mechanical properties, which can meet the requirements for general strawberry jam conveying. 316 stainless steel, due to the presence of molybdenum element, has stronger corrosion resistance, especially has better resistance to chloride ions, and is suitable for some occasions with high hygiene requirements or where the strawberry jam contains corrosive components such as a high salt content.
Surface Treatment
In order to improve the wear resistance, corrosion resistance, and surface finish of the rotor, the stainless steel cam rotor is usually subjected to surface treatment. Common surface treatment methods include polishing, passivation, etc. Polishing treatment can make the surface of the rotor smoother, reduce the adhesion and residue of strawberry jam during the conveying process, facilitate cleaning, and at the same time reduce fluid resistance and improve the efficiency of the pump. Passivation treatment forms a dense oxide film on the surface of the rotor, further improving its corrosion resistance and preventing the stainless steel from rusting during use.
