Self-priming jet pump

A self-priming jet pump, comprising:

• a pump body provided with a water inlet and a water outlet, wherein a jet tube and an impeller are arranged in the pump body,
• the jet tube is in communication with the water inlet and an inlet of the impeller, a channel is arranged on an outer periphery of the jet tube, the channel is communicated with the water inlet and the inlet of the impeller, a fluid passing through the jet tube or the channel is thrown out by the impeller to enter a pressurizing chamber,
• the channel is arranged around the outer periphery of the jet tube, and
• the channel is provided with a valve core;
• wherein a jet device is arranged in the pump body, and the jet device comprises the jet tube, a water inlet tube, and the pressurizing chamber,
• wherein the impeller is arranged in the pressurizing chamber;
• the water inlet tube is connected to the water inlet, the water inlet tube is in communication with the jet tube and a valve port of the channel;
• the jet tube is in communication with the water inlet tube and the inlet of the impeller;
• the channel is in communication with the water inlet tube and the inlet of the impeller;
• and
• the pressurizing chamber is in communication with the water outlet of the pump body,
• wherein a cross-section of the channel is circular or rectangular, and
• wherein a section of the channel adjacent to the impeller forms a guide channel, and a longitudinal section of the outer side wall surface of the guide channel is a multi-stepped surface, and a guide port of the guide channel is formed at an outer wall surface of the jet tube adjacent to the impeller.