Water pump connecting structure for oral irrigator and oral irrigator comprising the same

An oral irrigator, comprising:

• a shell, a bracket, a nozzle, a water storage tank, a water inlet pipe, and a water pump connecting structure, wherein
• the nozzle and the water storage tank are arranged at end parts of the shell respectively;
• the bracket is fixed in the shell;
• the water pump connecting structure is mounted on the bracket;
• a pump body is connected to the water inlet pipe and the nozzle respectively;
• and
• the water inlet pipe is connected to the water storage tank;
• the water pump connecting structure for an oral irrigator, comprising:
• the pump body, a piston ring, a connecting rod assembly, and a driving assembly;
• the piston ring is arranged on an inner side wall of the pump body;
• the connecting rod assembly penetrates into the pump body and penetrates through the piston ring;
• the piston ring is in interference connection with the connecting rod assembly;
• the connecting rod assembly is connected to the driving assembly, and is configured to make reciprocating motion in the pump body through the driving of the driving assembly and guidance of the piston ring;
• the connecting rod assembly and the piston ring are configured to cooperate with each other to draw liquid from a water inlet of the pump body and to pump the liquid out from a water outlet of the pump body, during reciprocating motion of the connecting rod assembly;
• and
• the piston ring comprises at least two guide rings and an outer ring, each of the at least two guide rings comprises a connection portion and an extension portion;
• the connection portion is connected to an inner side of the outer ring and the extension portion is configured to be extended towards an adjacent guide ring from an inner side of the connection portion;
• and an axial cross section of each of the at least two guide rings is L-shaped.