Blowing nozzle for supporting a weft thread in a weaving machine

Blowing nozzle for supporting a weft thread in a weaving machine, said nozzle including a flow-through canalisation for a fluid flowing into the environment via at least one outlet opening;

• a jet pipe formed in the flow-through canalisation, wherein the flow-through canalisation narrows from a part preceding the narrowest section up to the narrowest section of the jet pipe, namely a critical section;
• wherein the flow-through canalisation widens from the critical section up to the outlet opening;
• and wherein a part of the flow-through canalisation which extends from the critical section up to the outlet opening has an upper wall which is made exclusively concave and which extends from the critical section to the outlet opening, and has a lower wall which first has a convex curve from the critical section and then a straight or almost straight section.

Blowing nozzle for supporting a weft thread in a weaving machine, said nozzle provided with a flow-through canalisation for a fluid flowing into the environment via at least one outlet opening wherein the flow-through canalisation has at least one duct in which is integrated a jet pipe, wherein the jet pipe is integrated in a bend of the flow-through canalisation, wherein said at least one duct has a rectangular section at least at the respective jet pipe, and wherein a part of said flow-through canalisation preceding a critical section of said jet pine narrows to the critical section, and a part of said flow-through canalisation extending from said critical section to said outlet opening has an upper wall which is exclusively concave and which extends from said critical section to said outlet opening.