Circulation purifier in 3D printing apparatus

The utility model discloses a circulation purifier in 3D printing apparatus, a circulation purifier in 3D printing apparatus includes the trachea of putting through mutually with the unit that takes shape, has connected gradually fan and filter core on the trachea and has formed closed circuit with shaping unit, the both ends of every filter core are provided with admission valve and air outlet valve respectively, still are provided with the blowback unit in every filter core. The utility model discloses a circulation purifier has avoided printing the in -process filter core and has changed the inconvenience that brings through adopting the parallelly connected alternate use of many filter cores, has guaranteed the continuation of the work of printing, the blowback unit that every filter core has can blow off absorbent impurity on the saturated filter core, recovers the state that can recycle with the filter core, accomplishes that every filter core recycles, simple structure, convenient to use has fine pract