公开(公告)号：US20210071658A1

公开(公告)日：2021-03-11

申请号：US16884301

申请日：2020-05-27

Applicant: Xiamen Koge Micro Tech Co., Ltd.

Inventor： Si-Cheng WANG

IPC: F04B45/047 ,  F04B53/10

Abstract: A diaphragm pump is revealed. The diaphragm pump includes a pump device, a pump body, a top cover, and an air release valve head. The pump body includes at least two air inlet passages, at least one air outlet passage and at least one leak-proof/sealing passage, all selectively communicating with one cavity. The top cover includes a valve port, an air vent and an air outlet duct. Air pressure in the leak-proof passage acts on the air release valve head so that the valve port is closed by the air release valve head while the pump device is pumping air. The air release valve head and the valve port are separated from each other and then the valve port is communicating with the air outlet duct when the pump device stops pumping air. The pump performance is improved and no air release valve is required.