公开(公告)号：US11714016B2

公开(公告)日：2023-08-01

申请号：US17396233

申请日：2021-08-06

Applicant: YAMASHIN-FILTER CORP.

Inventor： Nobuki Sasaki ,  Megumi Nomoto ,  Tatsuhiro Oshita

IPC: G01L19/14 ,  F16J15/02 ,  G01L13/02

CPC classification number: G01L19/147 ,  F16J15/022 ,  G01L13/025

Abstract: A leakage of liquid inside a differential pressure detection device is reliably preventable. A diaphragm portion that detects a differential pressure as a pressure difference between a high pressure side and a low pressure side includes an annular member, a strain gauge provided in a hollow portion of the annular member, and a first plate and a second plate provided such that the annular member and the strain gauge are sandwiched. The first plate and the second plate each abut on a first annular packing. A first groove and a second groove (the first annular packing) overlap with the annular member when viewed from a first direction along an axis of the first hole.

公开(公告)号：US12025526B2

公开(公告)日：2024-07-02

申请号：US17245911

申请日：2021-04-30

Applicant: YAMASHIN-FILTER CORP.

Inventor： Nobuyuki Kitajima ,  Nobuki Sasaki ,  Megumi Nomoto

IPC: G01L9/14 ,  G01L9/00

CPC classification number: G01L9/14 ,  G01L9/0089

Abstract: A differential pressure measurement range is widened and differential pressure can be measured particularly during low differential pressure. A first spool facing a space in a high pressure side is lighter than a second spool facing a space in a low pressure side in a state where a magnet is provided. Urging force of a first elastic member that urges the first spool toward the space in the high pressure side is smaller than urging force of a second elastic member that urges the second spool toward the space in the high pressure side, and the first elastic member and the second elastic member are disposed in series.