Diaphragm pump

Abstract

A diaphragm pump includes a driving assembly including a base seat and an electric motor provided to the base seat; a pump body connected to the base seat so as to define a chamber; a connecting rod assembly disposed in the chamber and including an eccentric wheel connected with an electric motor shaft of the electric motor; a photoelectric shielding sheet separately provided to the eccentric wheel and configured to rotate synchronously with the eccentric wheel and the electric motor shaft; and a photoelectric sensor provided to the base seat and cooperating with the photoelectric shielding sheet so as to detect a rotational speed of the electric motor shaft and send a detected signal to an electric motor controller. The electric motor controller adjusts the rotational speed of the electric motor shaft of the electric motor according to the detected signal.

Dependencies are inferred from the claim text.