In the fields of industrial refrigeration, laboratory temperature control, and precision manufacturing, water-cooled integrated temperature controllers are widely used due to their advantages of efficient heat transfer and precise temperature control. However, as one of its common faults, "water leakage" may not only cause equipment shutdown and affect production progress, but also lead to circuit short circuits or environmental safety hazards. This article will start from the root cause of water leakage and provide systematic troubleshooting and solutions.
1、 The core cause of water leakage problem
The leakage of water-cooled temperature controllers is often caused by seal failure, component aging, or installation omissions, which can be divided into three categories:
1. Hidden dangers in pipeline connection: If the threaded interfaces between the inlet and outlet, valves, and pipelines are not tightened or the raw material tape is unevenly wrapped, leakage may occur due to pressure fluctuations; Long term vibration may cause loose joints, especially in equipment that frequently starts and stops.
2. Aging of seals: Rubber/silicone components such as water pump shaft seals and heat exchanger seals that come into long-term contact with circulating water (which may contain impurities or corrosive components) are prone to accelerated aging due to high temperature and high pressure, resulting in loss of elasticity and seal failure.
3. Internal component damage: Heat exchanger copper/stainless steel pipes may develop sand holes or cracks due to water corrosion (such as scaling, acidic water); The welding seam of the water tank may also cause water leakage due to poor welding or material fatigue cracking.
2、 Step by step investigation and solution strategy
Step 1: Locate the leakage point and distinguish between "external leakage" and "internal leakage"
After shutting down the machine and cutting off the power, observe the location of the water leakage: if it is dripping from the pipeline interface, valve, or outer wall of the water tank, it is considered as "external leakage"; If the water level continues to drop but there are no obvious external wet marks, it may be due to "internal leakage" of the heat exchanger or internal pipelines (which needs to be verified through pressure testing).
Step 2: Targeted handling of leakage issues
Interface leakage: Close the inlet valve, drain some of the circulating water to reduce pressure, and re tighten the interface with a wrench (pay attention to the force to avoid slipping); If there is still water seepage, remove the interface and clean the old raw material tape. Wrap the new tape 10-15 times clockwise (the thickness should cover the threads, as excessive thickness can easily cause compression and result in poor sealing).
Aging of sealing components: Disassemble the end cover of the water pump or heat exchanger, remove the old sealing ring (record size), replace it with a new component of the same specifications that is temperature resistant (-20 ℃~150 ℃) and corrosion-resistant (such as fluororubber), and apply a small amount of silicone grease during installation to enhance adhesion.
• Cracking of water tank welds: Small cracks can be filled with metal repair agents (such as epoxy resin adhesive) and cured; If the cracks are long or repeatedly crack, it is recommended to contact the manufacturer to replace the water tank (to avoid welding and damaging the original anti-corrosion layer).
Step 3: Dealing with internal leakage and systematic prevention
Internal leaks are often caused by damage to heat exchangers or internal pipelines, and require professional testing: use a pressure pump to fill the waterway with 0.3-0.5MPa compressed air (with fluorescent agent added to the water for observation), lock the leak point, and replace the damaged pipe section or heat exchanger.
Daily prevention requires establishing a maintenance mechanism: monthly inspection of interface tightness and sealing status; Clean the water tank quarterly and replace the circulating water (it is recommended to use deionized water or add corrosion and scale inhibitors); Perform pressure testing on heat exchangers annually to prevent accelerated corrosion caused by water quality issues.