Diaphragm pump

A diaphragm pump, comprising:

• a pump body comprising an upper cover, a valve seat and a cylinder body connected in sequence, the valve seat having a water inlet hole and a water outlet hole, the upper cover and the valve seat defining a water inlet cavity and a water outlet cavity independent from each other, the water inlet hole being in communication with the water inlet cavity while the water outlet hole being in communication with the water outlet cavity, a mounting base being provided to a bottom of the water outlet cavity, and a plurality of spaced first position-limiting members being formed at a top of the water outlet cavity and extending downwards;
• a water inlet valve block provided to a bottom surface of the valve seat to open or close the water inlet hole;
• a diaphragm assembly mounted to the mounting base to control opening or closure of the water outlet hole, and comprising a plurality of water outlet valve blocks arranged opposite to the plurality of first position-limiting members;
• a piston assembly connected to a bottom of the valve seat, and comprising a capsule body having a capsule cavity, the capsule cavity being communicated with the water inlet cavity and the water outlet cavity through the water inlet hole and the water outlet hole respectively;
• a connecting rod assembly driving the capsule body to swing up and down between an upper movement dead point and a lower movement dead point to squeeze or stretch the capsule cavity so as to realize a function of pumping fluid, the connecting rod assembly comprising:
• a connecting rod connected with the capsule body, a steel shaft having an upper end connected with a connecting hole, and an eccentric wheel connected with a lower end of the steel shaft;
• a driving assembly comprising:
• a base seat connected to the pump body to define a chamber and an electric motor having an electric motor shaft connected with the eccentric wheel.