公开(公告)号：US11953119B2

公开(公告)日：2024-04-09

申请号：US18474975

申请日：2023-09-26

Applicant: SHENZHEN KEYTO FLUID TECHNOLOGY CO., LTD.

Inventor： Cheng Zhang ,  Xiyuan Xiao ,  Jin Liu ,  Yi Wu

IPC: F16K37/00 ,  A61M5/20 ,  A61M5/315 ,  F04B17/03 ,  F04B49/06 ,  F16K11/074 ,  F16K31/04

CPC classification number: F16K37/005 ,  A61M5/20 ,  A61M5/31546 ,  A61M5/31565 ,  A61M5/31568 ,  A61M5/3157 ,  A61M5/31576 ,  A61M5/31585 ,  F04B17/03 ,  F04B49/06 ,  F04B49/065 ,  F16K11/0743 ,  F16K31/042 ,  F16K37/0041 ,  A61M5/31573 ,  A61M2005/31588 ,  F04B2201/0201 ,  F04B2205/03

Abstract: A micro-metering device with a constant flow rate, including a rotary shear valve, a mounting seat, a rotation drive assembly, an injection drive assembly and a controller. The rotary shear valve includes a valve main body and a valve spool. The valve main body is provided with a main flow channel and a plurality of branch flow channels. The valve spool is rotatably arranged inside the valve main body, and is configured to communicate the main flow channel with different branch flow channels. A pressure sensor is provided inside the valve main body, and is communicated with the main flow channel. The pressure sensor is configured for detecting a pressure inside the main flow channel. Whether the switching of the liquid path is correct is determined according to the pressure in the main flow channel.