Self-priming Pump Apparatus for Rapid No-Water Startup

The patent applies the self-service principle by enabling the centrifugal pump to perform its own priming operation without requiring an external vacuum pump. The pump chamber is equipped with a self-priming structure that automatically creates negative pressure and draws water into the chamber during startup, making the system self-sufficient for water filling and eliminating the need for additional energy-consuming equipment.

The self-priming structure integrates the water filling function directly into the pump chamber, eliminating the need for separate external vacuum pump equipment and complex operational procedures. The automatic priming mechanism simplifies the startup process to a single operation while ensuring reliable water filling.

The patent applies preliminary action by automatically filling the pump chamber with water before the main pumping operation begins. The self-priming structure creates negative pressure that draws water into the chamber in advance, ensuring the chamber is properly primed before startup. This preliminary water filling prevents cavitation and component damage while maintaining simple operation.

The self-priming structure utilizes periodic action through the reciprocating motion of the piston, which creates alternating periods of negative pressure (suction stroke) and positive pressure (discharge stroke). During each suction stroke, water is drawn into the pump chamber, and this periodic cycling continues until the chamber is fully primed. This periodic mechanism accelerates the water filling process compared to traditional methods.