Pumps with a waterproof structure

A water pump, comprising:

• a motor housing including a first end surface;
• a motor accommodated in the motor housing and including a motor shaft;
• a pump body having a through hole, fixed on the first end surface of the motor housing and including an impeller chamber and a drainage chamber opposite to the impeller chamber, wherein the drainage chamber is a first drainage chamber comprising a second drainage chamber;
• an impeller having a shaft seal, accommodated in the impeller chamber of the pump body and fixed on the motor shaft of the motor, wherein the impeller and the impeller chamber of the pump body are sealed by the shaft seal of the impeller;
• a blocking member driven by the motor shaft of the motor and disposed in the drainage chamber of the pump body, the blocking member comprising:
• a first annular ring comprising an inclined surface partially disposed in the drainage chamber, and
• a second annular ring which extends radially outward from the first annular ring and is integrally formed with the first annular ring,
• wherein the blocking member is configured to rotate synchronously with the motor shaft;
• wherein the motor shaft passes through the blocking member and the through hole of the pump body, and is threaded to the impeller;
• and an annular wall inside the first drainage chamber and a notch on a lower position of the annular wall, wherein a side of the annular wall inside the second drainage chamber of the first drainage chamber and the second annular ring of the blocking member form the second drainage chamber.