The invention discloses a low-
noise self-priming combined pump. According to the low-
noise self-priming combined pump,
diffusion guide vanes and a guide disc of a traditional self-priming jet pump are removed, a single-baffle-tongue single-outlet centrifugal vortex chamber or a multi-baffle-tongue multi-outlet centrifugal vortex chamber which is higher in hydraulic performance and efficiency is adopted, a single
entry type runner is designed, centrifuged and accelerated fluid is reasonably guided into a distribution pumping chamber or a distribution tee joint, scraping among the guide vanes, the guide disc and a centrifugal
impeller and strong
impact of the high-speed fluid to the guide vanes and the guide disc are eliminated essentially, transitional flowing between the centrifugal vortex chamber and the distribution pumping chamber or the distribution tee joint is more smooth, and the flowing losses and flowing
noise are lower. Through the reasonable arrangement of the single
entry type runner, continuous supply of the
working fluid at the inlet section of a
spray nozzle can be guaranteed, so that negative pressure is maintained, and strong self-priming capacity is obtained. The traditional large-sized distribution pumping chamber can be replaced with the distribution tee joint, and thus the structure is more compact.