Patent ID: 7100454

Claim:
An in-line type fluid pressure sensor comprising a body member ( 1 ) and a sensor module ( 2 ), wherein: said body member ( 1 ) is provided with an upstream-side connection port ( 5 ), a downstream-side connection port ( 6 ) and an upper portion; said upstream-side connection port ( 5 ) and said downstream-side connection port ( 6 ) both are connected with a fluid flow passage ( 9 ) of a fluid flow circuit through which a fluid is circulated; said sensor module ( 2 ) is disposed in said upper portion of said body member ( 1 ); an intermediate portion of said fluid flow passage ( 9 ) extending from said upstream-side connection port ( 5 ) to said downstream-side connection port ( 6 ) is moderately bent to form a fluid introduction portion ( 9 a ) of said body member ( 1 ), which introduction portion ( 9 a ) assumes a substantially inverted V-shaped form in contour in longitudinal section of said fluid flow passage ( 9 ) so as to form an upper wall of said fluid flow passage ( 9 ) into said substantially inverted V-shaped form or into a divergent shape in contour in longitudinal section of said fluid flow passage ( 9 ), wherein an upper end portion of said fluid introduction portion ( 9 a ) forms an opening through which a fluid pressure receiving surface of said sensor module ( 2 ) is brought into contact with said fluid to realize a precise measurement of fluid pressure of said fluid; said flow passage ( 9 ) in said upstream-side connection port ( 5 ) is substantially equal in cross-sectional area to said flow passage ( 9 ) in said downstream-side connection port ( 6 ) and also to said flow passage ( 9 ) in said fluid introduction portion ( 9 a ) of said body member ( 1 ) by having a partially raised portion ( 8 ) on a bottom wall of said fluid introduction portion ( 9 a ) in said body member ( 1 ) corresponding in location and inclination to said upper wall of said fluid introduction portion ( 9 a ) in said body member ( 1 ); said upper wall of said fluid introduction portion ( 9 a ) in said body member ( 1 ) is provided with both an inlet corner portion ( 9 b ) and said outlet corner portion ( 9 c ) is constructed of a curved surface; said raised portion ( 8 ) of said fluid introduction portion ( 9 a ) in said body member ( 1 ) is provided with both a beginning end portion ( 8 a ) and a terminating end portion ( 8 b ); and, each of said beginning end portion ( 8 a ) and said terminating end portion ( 8 b ) of raised portion ( 8 ) is constructed of a moderately curved surface.