Clothes Dryer Compressor Lubricant Return for Heat Pump Durability

The system performs preliminary action by operating the compressor at a high rotation rate during a predetermined time period after the drying operation is terminated. This preliminary high-speed operation creates a strong suction force that draws lubricant from the refrigerant pipe back into the compressor before the system shuts down, preventing lubricant discharge into the refrigerant pipe while maintaining compressor durability.

The system applies periodic action by using different rotation rates at different time periods. During the drying operation, the compressor operates at a normal rotation rate. After the drying operation terminates, it switches to a high rotation rate for a predetermined time period to retrieve lubricant, then returns to normal or shuts down. This periodic variation in operation mode optimizes both lubricant management and compressor durability.

The system ensures continuity of useful action by maintaining adequate lubricant levels in the compressor through periodic high-speed operation after the drying cycle. This continuous lubricant retrieval process ensures that the compressor always has sufficient lubricant for both compression function and heat exchange efficiency, eliminating the trade-off between durability and productivity.

The system applies discarding and recovering by allowing lubricant to temporarily move into the refrigerant pipe during normal operation, then recovering it through high-speed compressor operation after the drying cycle. This recovery process ensures that lubricant is not permanently lost to the refrigerant pipe but is instead retrieved and reused, maintaining both compressor durability and heat exchange efficiency.