BCF yarn deformer

The utility model relates to the technical field of spinning, in particular to a BCF (bulked continuous filament) deformer, which comprises a deformation nozzle, a bulking deformation device, a vacuumcover box and an output pipe, wherein the puffing deformation device is arranged in the vacuum cover box; the deformation nozzle penetrates through the first end part of the vacuum cover box and is fixedly connected with the upper end of the puffing deformation device; the output pipe penetrates through the second end part of the vacuum cover box and is fixedly connected with the lower end of thepuffing deformation device; the first end of the vacuum cover box is fixedly connected with the deformation nozzle, and the second end of the vacuum cover box is fixedly connected with the output pipe. The BCF filament deformer provided by the embodiment of the utility model is composed of the deformation nozzle, the puffing deformation device, the vacuum cover box and the output pipe, the structure is simple, the filamen