Patent ID: 6557408
Filing Date: 2003-05-06
Classification: G01F

Abstract:
In a device (1) for measuring the mass of a medium flowing in a line (2) along a primary flow direction (3), in particular the air flow rate for an internal combustion engine, having a measurement housing (6) provided in the line (2), which housing communicates with a carrier part, whose common longitudinal axis (8) extends perpendicular to the primary flow direction (3),having a measurement conduit (40) in the measurement housing (6), which conduit extends from an inlet opening (11) and an inlet conduit (13), which is adjoined by a first portion (16) of a deflection conduit (15), within which portion the medium flows from the inlet conduit (13) and is deflected from a peripheral face (20) of the first portion (16) into a second portion (17) of the deflection conduit (15), and an outlet conduit (19) to an outlet opening (12) that discharges into the line (2) at an outer face (21) of the measurement housing (6), wherein at least one part of the center line (23) of the inlet conduit and at least one part of the center line (22) of the outlet conduit extends inclined toward the primary flow direction (3), and having a measuring element (10) bathed by the flowing medium located in the measurement conduit (40) and disposed on a sensor carrier (9), the improvement wherein the flow cross section of the inlet conduit (13) narrows in the primary flow direction (3) toward the deflection conduit (15), and the peripheral face (20) of the first portion (16) of the deflection conduit (15) is located in the projection of an outlet opening (14) of the inlet conduit (13) in the flow direction (25) in the inlet conduit (13) onto the opposite wall of the first portion (16) and is embodied as inclined counter to the flow direction (25) in the inlet conduit (13), and the sensor carrier extends from a first side of the inlet conduit (13) which is remote from the outlet conduit (19) to a second side (27) of the inlet conduit which is closer to the outlet conduit and together with second side (27) forms a flush transition (50), so that no flow around the sensor carrier (9) occurs there.