Comparison with Centrifugal Pumps (Milk Pumps): Centrifugal pumps have gained widespread use due to their simple structure and low cost. Compared to rotor pumps, they have the following main differences: Chemical Pumps, Sanitary Pumps.
(1) The rotor pump is a positive displacement pump, allowing for precise control of flow rate and can easily be converted into a variable flow pump. In contrast, the output flow of a centrifugal pump is uncontrolled and decreases with increasing resistance; rotor pumps have strong self-priming capabilities, whereas centrifugal pumps must be filled with liquid before operation.
(2) The rotor pump operates at a low speed, typically ranging from 200 to 600 rpm, ensuring that the material being conveyed is smoothly discharged without damaging its composition. In contrast, centrifugal pumps run at high speeds, causing the conveyed material to be subjected to strong impacts and centrifugal forces, often resulting in inconsistent composition of the mixture being transported, thereby lowering the quality of the finished product. The universal conveying pump is the ideal solution to this issue, making it particularly suitable for conveying mixed materials, including those containing solid particles.
(3) Positive displacement pumps, also known as colloidal pumps, are suitable for transporting highly viscous substances. Centrifugal pumps do not possess this characteristic.
(4) Positive displacement pumps can be easily manufactured in high-pressure models, such as 150 kgf/cm², suitable for long-distance or high-resistance precise delivery.
(5) The manufacturing process of positive displacement pumps is more complex and precise, with higher costs, which distinguishes it from centrifugal pumps.
Routine Maintenance
In everyday use, pay attention to storing stainless steel rotor pumps in a dry, clean, and non-corrosive gas environment. Keep each part well-preserved and replace with identical parts. When disassembling and inspecting high-viscosity rotor pumps, ensure each part is preserved. Pay special attention to the explosion-proof surface of the explosion-proof parts, as it should not be damaged or roughened, including the insulating liner and sleeve. In case of damage, replace with new identical parts. Do not use substitute materials that fall below the performance of the original materials or parts that do not match the original specifications. When assembling, make sure all parts are reassembled in their original positions without any omissions.
Stainless steel rotor pumps often require lubrication, while electric drum pump operate at high speeds, with lubricants prone to evaporation. Therefore, it is crucial to maintain clean lubrication at the bearing and to regularly replace it. High-viscosity rotor pumps should be regularly inspected and maintained. Electric drum pumps should also be inspected and serviced frequently, including checking the power lines: internal wiring, plugs, and switches for proper condition, as well as ensuring normal insulation resistance. Check for loose brush holders, ensure good contact between the commutator and brushes, inspect for any intermittent circuit breaks in the armature winding and stator winding, and check for damage to the bearings and rotating parts. Pay attention to insulation resistance in high-viscosity rotor pumps. For electric submersible pumps that have been stored unused for a long time or used in damp conditions, measure the insulation resistance of the winding with a 500-volt meter before use. If the insulation resistance between the winding and the motor housing is less than 7, the winding must be dried.
