A self-priming starting device for a centrifugal pump, wherein the self-priming starting device is mounted on a water inlet pipe of the centrifugal pump and comprises an outer housing, an inner housing, a drum, a three-blade support, a primary spacer, a secondary spacer, a tertiary spacer, an opening and closing disc, and an elastic steel plate;
- the outer housing has a bottom being in communication with the water inlet pipe, and the primary spacer, the secondary spacer and the tertiary spacer are provided sequentially in the outer housing—from top to bottom;
- the primary spacer is provided with a primary spacer through-hole, the inner housing is provided above the primary spacer through a support, an outer wall of the inner housing forms an outer self-priming chamber with an inner wall of the outer housing and a top wall of the primary spacer, the inner housing is provided with a plurality of air inlet pipes and a plurality of air discharging pipes, the air inlet pipes are in communication with the outer self-priming chamber, and the air discharging pipes are in communication with an atmosphere;
- the drum is provided in the inner housing and fits within an inner wall of the inner housing, the drum is provided with a. plurality of drum chambers, and the air inlet pipes, the air discharging pipes and the drum chambers have an equal number and are evenly distributed in a circumferential direction, the drum forms an inner self-priming chamber inside, the three-blade support has a rotating body and three support rods evenly distributed on the rotating body in a circumferential direction, the three-blade support is rotatably arranged in the inner self-priming chamber, the drum is provided with two limit blocks on an inner wall of the drum, a. top of a support rod of the three support rods is located between the two limit blocks, each of the drum chambers is provided with a piston, and the piston is connected to the rotating body via a connecting rod;
- the secondary spacer and the primary spacer form a gas-liquid separation chamber-therebetween, and a gas-liquid cutter is provided in the gas-liquid separation chamber, the gas-liquid cutter has spiral blades attached to a surface of the gas-liquid cutter, the secondary spacer is provided with a secondary spacer through-hole, the secondary spacer has a plurality of gas-liquid inlets near the inner wall of the outer housing, and a gas-liquid separation plate is provided beside the gas-liquid inlets;
- the secondary spacer, the tertiary spacer and the outer housing form a gas-liquid chamber therebetween, the opening and closing disc is installed in the gas-liquid chamber and is configured to slide up and down along a wall surface of the outer housing and divide the gas-liquid chamber into an upper gas-liquid chamber and a lower gas-liquid chamber, the opening and closing disc is provided with a plurality of secondary drainage holes, the opening and closing disc is provided with a vertical rod in a middle, and the vertical rod is provided with a transverse through-hole and a longitudinal through-hole, a first end of the longitudinal through-hole is in communication with the transverse through-hole, and a second end of the longitudinal through-hole is in communication with the water inlet pipe, and the opening and closing disc has a bottom wall being configured to fit completely against an upper wall of the tertiary spacer;
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- the tertiary spacer is provided with a plurality of tertiary spacer through-holes, the tertiary spacer through-holes communicate the lower gas-liquid chamber with the water inlet pipe, the elastic steel plate in a curved shape is fixed on an inner wall surface of the water inlet pipe, the elastic steel plate is provided with a plurality of elastic steel plate through-holes, a bottom end of the vertical rod extends through the tertiary spacer and the elastic steel plate, and the bottom end of the vertical rod is provided with a limit boss.