How to troubleshoot and solve the overheating of Dalian Chemical Pump Motor

Overheating of Dalian chemical pump motors is a common fault phenomenon in chemical production, which may lead to equipment damage, production interruption, and even safety accidents.

1、 Analysis of the causes of motor overheating

1. Electrical system reasons

Voltage abnormality: High or low voltage can cause the motor to overheat

Current imbalance: Three phase current imbalance exceeding 10% will lead to increased temperature rise

Winding fault: winding short circuit, grounding or insulation aging

Frequent startup: Multiple startups in a short period of time leading to accumulated heating

2. Mechanical system reasons

Bearing failure: Poor lubrication or bearing damage leading to increased friction

Mechanical seal too tight: increased motor load

Poor alignment of coupling: additional radial force generated

Unbalanced impeller: causing vibration and additional load

3. Process system reasons

Medium specific gravity change: Overloading caused by exceeding the design range

Abnormal flow: deviation from the optimal operating point

Cavitation phenomenon: causing vibration and load fluctuations

Increased pipeline resistance: Insufficient valve opening or blockage

4. Environmental factors

High ambient temperature: deterioration of heat dissipation conditions

Poor ventilation: blocked cooling air duct

High humidity: affecting insulation performance

2、 System troubleshooting process

1. Preliminary inspection

Sensory examination: observe whether there is smoke or odor, touch the temperature of the shell

Running status: Check for abnormal vibration or noise

Instrument reading: record parameters such as current, voltage, temperature, etc

2. Electrical system inspection

Measure three-phase voltage: Use a multimeter to check for balance

Detecting insulation resistance: Use a megohmmeter to measure the insulation of the winding to ground

Current test: Clamp meter measures the balance of three-phase current

Protection device inspection: whether the thermal relay, circuit breaker, etc. are normal

3. Mechanical system inspection

Bearing inspection: listen to sound, measure temperature, check lubrication condition

Alignment detection: Use a dial gauge to check the alignment of the coupling

Mechanical seal: Check for tightness or damage

Impeller inspection: check for wear or blockage

4. Process system inspection

Medium parameters: check if density, viscosity, temperature, etc. are normal

Traffic monitoring: confirm whether it is within the design scope

Pipeline inspection: valve status, filter blockage

Cavitation inspection: listen for the unique cracking sound of cavitation

3、 Solution

1. Electrical problem handling

Voltage adjustment: Contact the power supply department to adjust or install a voltage regulator

Winding repair: partial repair or rewinding of the coil

Protection device setting: reset the protection value of the thermal relay

Application of frequency converter: adopting frequency conversion control for frequent start stop working conditions

2. Mechanical fault handling

Bearing replacement: Choose bearings suitable for chemical environments

Re centering: Use a laser centering device to accurately adjust

Sealing adjustment: Adjust the mechanical seal compression according to the standard

Dynamic balance correction: on-site dynamic balancing of the impeller

3. Process optimization measures

Operating condition adjustment: Control the flow rate within the efficient zone

Pipeline renovation: reduce unnecessary bends and valves

Cavitation prevention and control: increase inlet pressure or reduce medium temperature

Filter maintenance: Regularly clean or replace the filter screen

4. Heat dissipation improvement plan

Forced ventilation: Install axial flow fan

Cooling fin cleaning: regularly remove dust and oil stains

Environmental control: improve the ventilation conditions of the pump room

Cooling system: Consider water-cooled jackets or air coolers

4、 Preventive maintenance recommendations

Establish inspection system: Regularly check parameters such as current, temperature, vibration, etc

Lubrication management: Replace suitable lubricating grease periodically

Insulation monitoring: Regularly measure the insulation resistance of the winding

Spare parts reserve: Maintain appropriate inventory of key components such as bearings

Operation record: Establish a complete equipment operation file

Personnel training: Improve the skills of operation and maintenance personnel

5、 Safety precautions

Before maintenance, the power supply must be cut off and verified

High temperature components need to be cooled before coming into contact

Take personal protective measures when handling chemical media

Pay attention to discharge when testing insulation

Do not remove the protective cover during operation

Through systematic investigation and targeted solutions, the problem of overheating of chemical pump motors can be effectively addressed, ensuring safe and stable production operation. The key is to establish a preventive maintenance philosophy and eliminate problems in their early stages.