Apparatus for producing a spun yarn

Apparatus for producing a yarn (4) spun from a loose fibre array (2) using a vortex flow acting as the sole twist-imparting means, which apparatus comprises a fibre supply duct (1), with an outlet opening (9), and a yarn take-off duct (5) with an inlet opening (11) distanced from said outlet opening (9), as well as means for generating a vortex flow in a vortex chamber (3), which essentially is arranged between said outlet opening (9) and said inlet opening (11), provided with nozzles (6) for injecting a fluid into the vortex chamber (3) and generating the vortex flow in the vortex chamber (3), and an exhaust duct (7) for draining the fluid from the vortex chamber (3),

• characterised in that the apparatus is provided with a wall limiting the vortex chamber (3) downstream zone, separating the vortex chamber (3) from the exhaust duct (7), at the centre of which said inlet opening (11) is arranged, and which for completely draining the fluid is provided with a plurality of openings (21) extending to the exhaust duct (7).