Vacuum-pumping type centrifugal pressure pump and vacuum-pumping method thereof

The invention provides a vacuum-pumping type centrifugal pressure pump and a vacuum-pumping method thereof. The vacuum-pumping type centrifugal pressure pump comprises a pump body, wherein a water pumping cavity is processed in the pump body; the upper part of the pump body is assembled with a power module; the output shaft of the power module vertically downwards extends into the water pumping cavity inside the pump body from the lower part of the power module; the lower end of the output shaft in the water pumping cavity of the pump body is fixedly connected with a horizontal rotary disc; the lower part of the rotary disc is uniformly distributed with vertical centrifugal blades through a vertical connecting shaft along the vertical centre axis; the connecting shaft is connected with therotary disc through a torsion spring; and the upper part of the pump body communicates with a jet-flow vacuum-pumping module through a gas valve. Water body resistance borne on centrifugal blades ofthe pump and rotation spee