If the water cooling system of the water-cooled bearing seat is not maintained properly, it is prone to problems such as scaling, leakage, and blockage, which can affect the heat dissipation efficiency of the bearing and even lead to equipment failure. The following are the core methods and operational points for daily maintenance:

1、 Water quality management: the foundation for preventing scaling and corrosion

Water quality monitoring and treatment

Hardness control: Regularly check the hardness of the cooling water (recommended ≤ 50mg/L CaCO3). If it exceeds the standard, a softening agent (such as trisodium phosphate) should be added or a softening water equipment should be used to avoid the deposition of calcium and magnesium ions and the formation of scale.

PH adjustment: Maintain the pH of the water at 7.5-8.5 (weakly alkaline) to prevent metal corrosion. It can be adjusted by adding corrosion inhibitors (such as organic amines) or neutralizing agents (such as sodium hydroxide), and tested once a month.

Impurity filtration: Install a filter with an accuracy of ≥ 50 μ m at the entrance of the waterway, clean the filter element regularly (check once a week), and prevent particles such as sediment and rust from blocking the pipeline.

Regular water replacement and sterilization

Water replacement cycle: According to the water pollution situation, replace all cooling water every 3-6 months. When changing water, rinse the inner wall of the pipeline with clean water to remove sediment impurities.

Sterilization treatment: In summer or humid environments, add non oxidizing fungicides (such as isothiazolinone) every 2 months to prevent microbial growth and the formation of biofouling.

2、 Waterway system inspection: eliminate leaks and blockages

1. Pipeline and interface maintenance

Leakage detection:

Daily inspection of pipeline interfaces (flanges, welds, threaded connections) to observe for dripping or water stains. Use soapy water to apply and test for air tightness. If leaks are found, replace the sealing ring or repair the welding immediately.

Focus on inspecting bends, valves, and other parts that are susceptible to water flow impact to avoid interface looseness caused by vibration.

Pipeline cleaning:

Perform chemical cleaning once a year: use citric acid solution (concentration 5-8%) to cycle and flush the pipeline, dissolve scale and rust, rinse with clean water and add corrosion inhibitor after cleaning.

2. Valve and Instrument Maintenance

Valve operation:

Manually open and close the bypass valve and shut-off valve once a week to prevent the valve core from rusting; The gate valve should be kept fully open or fully closed to avoid wear on the sealing surface caused by half opening.

Instrument calibration:

Pressure gauges and flow meters should be sent for inspection every six months to ensure display accuracy (error ≤ ± 2%); The temperature sensor needs to be regularly compared with a standard thermometer, and replaced when the deviation exceeds 1 ℃.

3、 Special maintenance of bearing seat and cooler

1. Cleaning of the cooler (heat exchanger)

Surface cleaning:

Open the end cover of the cooler every month and flush the inner wall of the heat exchange tube with a high-pressure water gun (pressure ≤ 0.5MPa) to remove scale and sediment; If it is a tubular cooler, a dedicated pipe runner can be used to clear blocked pipes.

Pressure test

Every year, conduct a water pressure test on the cooler (with a test pressure of 1.25 times the working pressure), and maintain the pressure for 30 minutes without any leakage. Otherwise, replace the leaking heat exchange tube or sealing gasket.

2. Sealing inspection of bearing seat

Sealing ring replacement:

After every 5000 hours of operation, disassemble the bearing seat and inspect the water jacket sealing ring (commonly made of fluororubber or nitrile rubber). If aging, cracking, or deformation occurs, replace it immediately to prevent cooling water from seeping into the bearing chamber.

Water jacket wall thickness detection:

Measure the wall thickness of the water jacket with an ultrasonic thickness gauge. When the corrosion thinning exceeds 20% of the original wall thickness, the bearing seat component needs to be replaced.

4、 Monitoring of operating parameters and handling of exceptions

Real time monitoring indicators

Water temperature control: Inlet temperature ≤ 35 ℃, outlet temperature ≤ 50 ℃. When the temperature difference exceeds 15 ℃, there may be poor heat dissipation, and the flow rate or scaling situation needs to be checked.

Flow monitoring: Maintain the rated flow rate (such as 90-110% of the design flow rate). If the flow rate drops sharply, it may be due to pipeline blockage or pump failure, and the machine should be stopped immediately for troubleshooting.

Pressure monitoring: Maintain the inlet pressure at 0.2-0.4MPa. When the pressure fluctuation exceeds 0.1MPa, check whether the valve opening or pump head is normal.

Common exception handling procedures

Possible causes and measures for handling abnormal phenomena

Excessive outlet temperature leads to scale deposition, insufficient flow rate, blockage of the cooler, chemical cleaning of the pipeline, cleaning of the filter, disassembly and unblocking of the cooler

Sudden drop in system pressure, pipeline rupture, sealing ring leakage, shutdown to locate the leakage point, and replacement of damaged components

Abnormal water flow sound, air in the pipeline, water pump cavitation, open the exhaust valve to exhaust air, check if there is any air leakage at the water pump inlet

5、 Maintenance cycle and record management

Hierarchical maintenance plan

Daily inspection: Record water temperature, pressure, and flow data daily, and inspect the appearance of pipelines.

Monthly maintenance: clean filters, test water quality, lubricate valve transmission components.

Annual overhaul: Disassemble the cooler for deep cleaning, replace the sealing ring, and calibrate the instrument.

ledger management

Establish a maintenance record ledger, including the time, content, replacement part model, testing data, etc. of each maintenance, to facilitate traceability of equipment status and predict faults in advance (such as adjusting cleaning cycles based on scale deposition rate).

6、 Safety and energy-saving optimization

Anti scald protection: Exposed water pipes should be wrapped with insulation cotton to prevent operators from being scalded by high temperatures and reduce heat loss.

Energy saving renovation: Adopting a variable frequency water pump to automatically adjust the flow rate according to the water temperature, or installing a waste heat recovery device to use the cooled water for other process links, reducing energy consumption.

summary

The maintenance core of the water cooling system lies in "preventing scaling, controlling leakage, and maintaining flow rate". Through standardized water quality management, regular equipment inspections, and precise parameter monitoring, the system life can be effectively extended to ensure bearing heat dissipation efficiency. Suggest developing personalized maintenance plans based on equipment usage frequency and operating conditions, and providing professional training to operators to enhance emergency response capabilities.