Insufficient Flow Rate
Rotor Wear: After long-term use, friction occurs between the flexible rotor and the pump body or other components, resulting in a change in the shape of the rotor and an increase in the clearance. This causes the liquid to flow back inside the pump, affecting the flow rate. For example, during the transportation of chili paste, particles such as chili seeds will accelerate the wear of the rotor.
Suction Pipeline Blockage: Impurities, agglomerates, or other foreign objects in the chili material may block the suction pipeline, preventing the liquid from smoothly entering the pump. For instance, chili skins may wind around the filter of the suction pipe, reducing the flow area.
Low Pump Rotation Speed: Malfunctions of the driving motor, insufficient power supply voltage, or failures of the transmission components may all lead to a decrease in the rotation speed of the pump, thereby reducing the flow rate.
Insufficient Head
Change in Liquid Viscosity: The viscosity of the chili material may change due to factors such as temperature and composition. When the viscosity increases, the head of the pump will be affected. For example, in winter, the viscosity of chili sauce will increase to some extent.
Impeller Damage: The impeller is a key component affecting the head. If the impeller has cracks, damage, or deformation, the impeller's ability to do work on the liquid will decrease, resulting in insufficient head.
Excessive Resistance in the Discharge Pipeline: The valve in the discharge pipeline not being fully opened, excessive bends in the pipeline, or a too small pipe diameter will all increase the pipeline resistance, reducing the actual head of the pump.
Seal Leakage
Aging of Sealing Elements: Components such as mechanical seals or packing seals will age and wear after long-term use, losing their sealing performance and causing the chili material to leak.
Improper Installation of the Shaft Seal: During the installation process, improper installation of the shaft seal, uneven sealing surface, or uneven pressure of the shaft seal spring will all cause seal leakage.
Wear of the Pump Shaft: The wear of the pump shaft will increase the clearance between the shaft and the sealing elements, resulting in seal failure and material leakage.
Motor Overload
Excessive Pump Flow Rate: If the actual operating flow rate exceeds the rated flow rate of the pump, it will increase the load on the motor, leading to overload. It may be due to the excessive opening of the outlet valve or the system resistance being less than the design value.
Increase in Material Viscosity: As mentioned before, when the viscosity of the chili material increases, the load on the pump will increase, and the motor needs to output more power to maintain operation, which is likely to cause overload.
Motor Malfunction: Malfunctions such as winding short circuits and bearing damage in the motor itself may also cause an increase in the motor current and result in an overload phenomenon.
Excessive Vibration and Noise
Rotor Unbalance: During the manufacturing or use of the flexible rotor, the mass distribution may be uneven, resulting in an unbalanced force when the rotor rotates, causing vibration and noise.
Misalignment between the Pump and the Motor: If the axes of the pump and the motor are not aligned during installation, it will generate additional radial forces and torques when the pump is in operation, leading to vibration and noise.
Unstable Foundation: An unstable installation foundation of the pump or loose anchor bolts will cause the pump to vibrate during operation, and the vibration will be transmitted to other components through the foundation, generating noise.
Cavitation Phenomenon: When the suction pressure of the pump is lower than the vaporization pressure of the liquid, bubbles will form in the liquid. The bubbles will burst in the high-pressure area inside the pump, generating impact forces, causing vibration and noise. For example, excessive resistance in the suction pipeline or too high liquid temperature may trigger cavitation.
