What are the common faults of Dalian chemical pumps?

As an important equipment in the chemical industry, the performance and reliability of chemical pumps are directly related to the safety and efficiency of chemical production. With the continuous development of the chemical industry, chemical pumps are also constantly advancing. In the future, chemical pumps will develop towards high efficiency, energy conservation, intelligence, environmental protection, and modularization, providing more reliable and efficient support for the development of the chemical industry.

Magnetic pump is an unsealed pump that drives the impeller to rotate through magnetic coupling, avoiding the leakage problem of traditional mechanical seals. Magnetic pumps are suitable for transporting toxic, harmful, flammable, explosive or high-value liquid media, and have the characteristics of no leakage and high safety. But its power and head are relatively low, making it suitable for situations with low flow and low pressure.

What are the common faults of Dalian chemical pumps?

mechanical failure

Pump shaft damage: During long-term operation, the pump shaft may be damaged due to excessive torque, bending moment, corrosion, wear, and other effects. If the journal is worn, it will cause an increase in the clearance between the bearing and the pump, which will affect the stability of the pump; The bending deformation of the shaft can cause friction between the impeller and the pump casing, and in severe cases, it can even cause the pump to malfunction.

Bearing failure: Bearings are key components that support pump shafts and are prone to failure due to poor lubrication, overload, and foreign material intrusion. For example, insufficient lubrication can cause an increase in bearing temperature and accelerate wear; Cracks, pitting and other damages on the bearing balls or raceways can cause abnormal vibration and noise during pump operation.

Impeller damage: Impeller is the core component of chemical pumps, which is prone to wear, corrosion, cavitation and other damages under high-speed rotation and medium erosion. Wear of the impeller can cause thinning of the blades, affecting the flow rate and head of the pump; Corrosion and cavitation can form pitting and honeycomb like pits on the surface of the impeller, and in severe cases, can lead to impeller fracture, resulting in a decrease in pump performance or even failure.

seal failure

Static seal leakage: The sealing gasket at the connection between the pump body, end cover, and pipeline may leak due to aging, damage, or improper installation. Manifested as the medium seeping out from the sealing surface, it not only causes material loss, but may also pollute the environment. If the medium is corrosive, it can also cause corrosion to equipment and foundations.

Dynamic seal failure: Mechanical seal is a commonly used dynamic seal method for chemical pumps. Common failures include seal surface wear, spring failure, and aging of seal rings. Wear of the sealing surface will increase the sealing gap, leading to medium leakage; Spring failure can prevent the sealing surface from maintaining a good fit, affecting the sealing effect; When the sealing ring ages, it will lose its elasticity and cannot provide a sealing effect.

Performance malfunction

Insufficient flow: It may be caused by various reasons, such as blockage of the pump impeller, which reduces the flow area of the medium; Air leakage in the suction pipe causes air to enter the pump, affecting the suction of the medium; The speed of the pump is too low to provide sufficient power to transport the medium; Changes in the viscosity, density, and other characteristics of the medium beyond the design range of the pump can result in the actual flow rate of the pump not meeting the design requirements.

Insufficient head: Problems such as impeller damage and seal leakage can cause the medium in the pump to reflux, resulting in a decrease in head. In addition, excessive resistance in the discharge pipeline, such as pipeline blockage or incomplete valve opening, can also require the pump to overcome greater resistance in order to deliver the medium to the specified height, resulting in insufficient head.

Pump vibration is high: In addition to mechanical failures such as bearing damage, pump shaft bending, etc. that can cause vibration, it may also be due to the unstable installation foundation of the pump, which generates resonance during operation; The medium contains gas, which causes cavitation phenomenon, resulting in vibration and noise; And unreasonable pipeline layout can generate additional stress on the pump and exacerbate pump vibration.

Flow rate and head are the basic parameters of a pump, and the appropriate pump type needs to be selected according to the process requirements. Excessive or insufficient flow can affect the stability of the process, while insufficient head cannot meet the transportation requirements. Factors such as temperature, pressure, and humidity in the working environment can also affect the selection of pumps. In high temperature, high pressure, or corrosive environments, it is necessary to choose pumps that are resistant to high temperature, high pressure, and corrosion.

Regularly check the vibration, noise, temperature and other parameters of the pump, promptly detect and handle any abnormal situations. Especially key components such as mechanical seals and bearings require special attention. Regularly lubricate the bearings, gears, and other moving parts of the pump to ensure smooth operation and reduce wear. Regularly clean the pump body and pipelines to prevent medium residue or scaling. For corrosion-resistant pumps, the integrity of the anti-corrosion coating should be checked regularly and repaired or replaced if necessary.