Gas sensor with improved structure of protective cover,申请号US20040759175-传众专利搜索

Gas sensor with improved structure of protective cover

申请公布号：US7413641(B2)

申请号：US20040759175

申请日期：2004.01.20

申请公布日期：2008.08.19

申请人：

DENSO CORPORATION

发明人：YAMADA KOHEI;YAMAMURA TAKESHI

分类号：G01N27/407;G01N27/409;G01N27/416;G01N33/00

主分类号：G01N27/407

摘要：An improved structure of a protective cover assembly of a gas sensor is provided. The protective cover assembly is of a double-walled structure made up of an inner and an outer cylindrical cover with gas holes. A sensing element is disposed within the inner cover. At least one of the gas holes of the outer cover partially faces a side wall of the inner cover. A top end surface of the inner cover lies within a range defined between opposed portions of a perimeter of the at least one of the gas holes of the outer cover closest to a top and a base end of the cover assembly, respectively. This structure works to avoid breakage of the sensing element arising from wetting with water and to improve a response rate of the gas sensor.