Miniature diaphragm pump with pressure relief protection function

The utility model relates to a miniature diaphragm pump with pressure relief protection, which is characterized in that a non-return seat is provided with a liquid return hole opposite to a drainage runner and a water inlet cavity, a liquid return pipe extending into the water inlet cavity is formed in the circumferential direction of the liquid return hole, a pressure relief sleeve sleeved on the liquid return pipe is formed on a lower sealing gasket, and the water outlet end of the liquid return pipe is sealed by the pressure relief sleeve. According to the technical scheme, additional accessories do not need to be additionally arranged, a pressure relief structure is attached to the liquid return pipe, therefore, the production cost can be greatly optimized, meanwhile, the assembly process is not changed, and the complexity and difficulty of the assembly process can be prevented from being increased. 本实用新型涉及一种带泄压保护的微型隔膜泵，其止逆座上开设有同排水流道和进水腔相对的回液孔，回液孔周向上形成有延伸至进水腔中的回液管，下密封垫上形成有套设于回液管上的泄压套，回液管的出水端由泄压套封闭，泄压套上开设有