| 摘要 |
A bag-type filter apparatus, whose elongate tubular filter bags (14) are supported by tubular cages (26) therewithin, is provided with an air diffuser tube (30) extending longitudinally within each tubular cage (26) for diffusing and distributing a periodic reverse purge air flow throughout each filter bag (14) to dislodge from the exterior surface of each filter bag particulate material which normally collects on the filter bags. Each air diffuser tube (30) is formed from a perforate strip of helically wound sheet metal, adjacent edges of which are interconnected by an imperforate seam (36) in which such adjacent edges overlap each other in interlocking relationship so that the seam extends helically around the respective air diffuser tube. |
