Device for generating negative pressure by means of a pressurized fluid, comprising an inflow channel and an outflow channel , and an injection channel , the outlet of which is arranged at a distance from the inlet of the inflow channel , wherein the inflow channel , the injection channel and the outflow channel are arranged along a common longitudinal center axis , the injection channel and the outflow channel have round internal cross-sections, and the injection channel tapers in a first section from its inlet and has an outlet in a terminal section , and the injection channel is contained, at least in sections, in a carrier projecting radially into the inflow channel , and the inlet of the injection channel is connected to a supply line for pressurized fluid, which is arranged inside the carrier and has a connection section extending radially to the longitudinal center axis , wherein the inflow channel forms a region of annular cross-section around the cantilevered portion of the injection channel to adjacent the inlet of the outflow channel , the inlet of the outflow channel is arranged at a distance from the outlet of the injection channel or the outlet of the injection channel is arranged inside the outflow channel , and the outflow channel tapers in a first section from its inlet to a second section of constant diameter and adjacently widens in a third section to its outlet , wherein the carrier , the injection channel and the feed line are contained in a central piece , characterized in that the outflow channel is formed in a tubular element which is detachably connected to the central piece exclusively in that an end portion of the tubular element , in which the outflow channel is formed, encompasses or is encompassed by the portion of the central piece in which the cantilevered portion of the injection channel is arranged, and in that the central piece contains the injection channel including its cantilevered portion and the feed line and is formed in one piece. the inflow channel , the injection channel and the outflow channel are arranged along a common longitudinal center axis , the injection channel and the outflow channel have round internal cross-sections, and the injection channel tapers in a first section from its inlet and has an outlet in a terminal section , and the injection channel is contained, at least in sections, in a carrier projecting radially into the inflow channel , and the inlet of the injection channel is connected to a supply line for pressurized fluid, which is arranged inside the carrier and has a connection section extending radially to the longitudinal center axis , wherein the inflow channel forms a region of annular cross-section around the cantilevered portion of the injection channel to adjacent the inlet of the outflow channel , the inlet of the outflow channel is arranged at a distance from the outlet of the injection channel or the outlet of the injection channel is arranged inside the outflow channel , and the outflow channel tapers in a first section from its inlet to a second section of constant diameter and adjacently widens in a third section to its outlet , wherein the carrier , the injection channel and the feed line are contained in a central piece , characterized in that the outflow channel is formed in a tubular element which is detachably connected to the central piece exclusively in that an end portion of the tubular element , in which the outflow channel is formed, encompasses or is encompassed by the portion of the central piece in which the cantilevered portion of the injection channel is arranged, and in that the central piece contains the injection channel including its cantilevered portion and the feed line and is formed in one piece. <EOS>