Water pump structure and oral irrigator

A water pump structure, comprising:

• a pump body;
• a sleeve, wherein at least a part of the sleeve is provided in the pump body, and the sleeve has a movable cavity therein;
• a piston assembly, wherein the piston assembly comprises a piston and a connecting member, an end of the connecting member is connected to the piston, and the piston is provided in the movable cavity and is in sliding fit with an inner wall of the movable cavity;
• and
• a driving assembly, wherein the driving assembly comprises a seat body, a cam, a connecting rod and a driving member, wherein an end of the cam is fixed on the seat body, and the cam is rotatably provided in the connecting rod;
• the connecting rod is provided with a sliding groove, an end of the cam away from the seat body is provided with a protrusion which is in sliding fit with an inner wall of the sliding groove;
• the connecting rod is connected to an end of the connecting member away from the piston;
• an output end of the driving member is provided to pass through the seat body and is fixedly connected to the seat body, and
• an opening direction of the sliding groove is same as a moving direction of the piston in the movable cavity,
• wherein when the output end drives the seat body to rotate, the cam rotating in the connecting rod can drive the connecting rod to make reciprocating motion.