Device for supplying a chemical reactant into the exhaust system of an internal combustion engine, comprising - a mixer housing (8, 8.1, 8.2) with an inlet opening (15, 15.1), through which the exhaust gas flow enters into the mixer housing (8, 8.1, 8.2), - a metering pipe (9, 9.1, 9.2, 9.3) with a first end and a second end, towards which the exhaust gas flow flowing into the mixer housing (8, 8.1, 8.2) flows in a transverse direction, - a metering unit, which is arranged at the first end of the metering pipe (9, 9.1, 9.2, 9.3) and can be connected to a reactant supply, for discharging reactant into the metering pipe (9, 9.1, 9.2, 9.3), and - means for generating a swirl flow of the exhaust gas flow, wherein these means are designed to generate this within the metering pipe (9, 9.1, 9.2, 9.3), and for this purpose the metering pipe (9, 9.1, 9.2, 9.3) has at least one in-flow opening (17; 17.1, 17.2), extending over at least one section of the length of the metering pipe (9, 9.1, 9.2, 9.3) located within the mixer housing (8, 8.1, 8.2), with at least one shovel-shaped hood (18; 18.1, 18.2, 18.3, 18.4, 18.5, 18.6) arranged on the metering pipe (9, 9.1, 9.2, 9.3), directing the exhaust gas flow eccentrically into the in-flow opening (17; 17.1, 17.2), wherein this at least one shovel-shaped hood (18; 18.1, 18.2, 18.3, 18.4, 18.5, 18.6) encloses the at least one in-flow opening (17; 17.1, 17.2) at the side and at the back and at least mostly covers it in the radial direction, and wherein a gap remains between the at least one hood (18; 18.1, 18.2, 18.3, 18.4, 18.5, 18.6) and the inner casing surface of the mixer housing (8, 8.1, 8.2), characterised in that the metering pipe (9, 9.1, 9.2, 9.3) engages through the mixer housing (8, 8.1, 8.2), and the at least one in-flow opening (17; 17.1, 17.2) of the metering pipe (9, 9.1) extends over a casing surface segment of no less than 45° in the circumferential direction, and in an angular configuration of this exhibits a trapezoidal outline geometry, wherein the shorter side of this outline geometry, in relation to the inflow direction of the exhaust gas, is the same as the rear edge following the longitudinal extension, that the metering unit injects the reactant under pressure into the metering pipe (9, 9.1, 9.2, 9.3), and that the spray cone of the reactant being injected into the metering pipe (9, 9.1, 9.2, 9.3), in the longitudinal extension of the metering pipe (9, 9.1, 9.2, 9.3) in the direction towards its second end, only emerges behind the at least one in-flow opening (17, 17.1, 17.2) onto the inner wall of the metering pipe (9, 9.1, 9.2, 9.3), and the exhaust gas flowing into the device (5, 5.1, 5.2, 5.3, 5.4) flows on the outside of this inner wall section of the metering pipe (9, 9.1, 9.2, 9.3). - a mixer housing (8, 8.1, 8.2) with an inlet opening (15, 15.1), through which the exhaust gas flow enters into the mixer housing (8, 8.1, 8.2), - a metering pipe (9, 9.1, 9.2, 9.3) with a first end and a second end, towards which the exhaust gas flow flowing into the mixer housing (8, 8.1, 8.2) flows in a transverse direction, - a metering unit, which is arranged at the first end of the metering pipe (9, 9.1, 9.2, 9.3) and can be connected to a reactant supply, for discharging reactant into the metering pipe (9, 9.1, 9.2, 9.3), and - means for generating a swirl flow of the exhaust gas flow, wherein these means are designed to generate this within the metering pipe (9, 9.1, 9.2, 9.3), and for this purpose the metering pipe (9, 9.1, 9.2, 9.3) has at least one in-flow opening (17; 17.1, 17.2), extending over at least one section of the length of the metering pipe (9, 9.1, 9.2, 9.3) located within the mixer housing (8, 8.1, 8.2), with at least one shovel-shaped hood (18; 18.1, 18.2, 18.3, 18.4, 18.5, 18.6) arranged on the metering pipe (9, 9.1, 9.2, 9.3), directing the exhaust gas flow eccentrically into the in-flow opening (17; 17.1, 17.2), wherein this at least one shovel-shaped hood (18; 18.1, 18.2, 18.3, 18.4, 18.5, 18.6) encloses the at least one in-flow opening (17; 17.1, 17.2) at the side and at the back and at least mostly covers it in the radial direction, and wherein a gap remains between the at least one hood (18; 18.1, 18.2, 18.3, 18.4, 18.5, 18.6) and the inner casing surface of the mixer housing (8, 8.1, 8.2), characterised in that the metering pipe (9, 9.1, 9.2, 9.3) engages through the mixer housing (8, 8.1, 8.2), and the at least one in-flow opening (17; 17.1, 17.2) of the metering pipe (9, 9.1) extends over a casing surface segment of no less than 45° in the circumferential direction, and in an angular configuration of this exhibits a trapezoidal outline geometry, wherein the shorter side of this outline geometry, in relation to the inflow direction of the exhaust gas, is the same as the rear edge following the longitudinal extension, that the metering unit injects the reactant under pressure into the metering pipe (9, 9.1, 9.2, 9.3), and that the spray cone of the reactant being injected into the metering pipe (9, 9.1, 9.2, 9.3), in the longitudinal extension of the metering pipe (9, 9.1, 9.2, 9.3) in the direction towards its second end, only emerges behind the at least one in-flow opening (17, 17.1, 17.2) onto the inner wall of the metering pipe (9, 9.1, 9.2, 9.3), and the exhaust gas flowing into the device (5, 5.1, 5.2, 5.3, 5.4) flows on the outside of this inner wall section of the metering pipe (9, 9.1, 9.2, 9.3).