Cold dryer

**Working Principle** High-temperature, high-humidity compressed air first enters a pre-cooling heat exchanger to exchange heat with the dried low-temperature gas for preliminary cooling. It is then sent into an evaporator, where the refrigerant circulates to cool the gas to a dew point temperature of 2–5°C. The saturated water vapor in the air condenses into liquid water droplets upon cooling. The airflow mixed with water vapor passes through a gas-water separator, where centrifugal force and baffle interception separate the liquid water, which is then periodically discharged by an automatic drain valve. The dewatered low-temperature dry air returns to the pre-cooling heat exchanger to recover cold energy, heats up, and is then discharged from the equipment. This not only prevents condensation on the outer walls of pipelines but also improves refrigeration efficiency, continuously outputting low-dew-point dry compressed air. **Application Fields** 1. **Laser cutting industry**: Prevents water ingress and frosting in the optical path of the laser head, protecting lenses and cutting heads to ensure cutting accuracy. 2. **Spray painting process**: Removes moisture from the air source to prevent bubbles, pinholes, and peeling defects on painted workpieces. 3. **Pneumatic automation production lines**: Prevents water ingress, rust, and jamming in solenoid valves, cylinders, and pneumatic valves, extending the service life of pneumatic components. 4. **Chemical and pharmaceutical production**: Ensures a dry, water-free air source for material conveying and filling processes, preventing raw materials from becoming damp and deteriorating. 5. **Food packaging industry**: Dehumidifies the air source for bottle blowing, sealing, and packaging to maintain stable quality of finished packaged products.