| 摘要 |
PURPOSE:To reduce noise while to improve the blow efficiency by setting a space section between inner and outer guide walls constituting the return path of an air-guide while forming a communicating section between the space section and the return path through the outer guide wall. CONSTITUTION:The curved guide wall 21 for partitioning respective return path 20 is separated into inner and outer guide walls 22, 23 to form a space section 25 set with an opening 24 at the inner end between them. While a slit section 26 for communicating between the space section 25 and an adjoining return path 20 is made through the outer guide wall 23. Consequently, the space section formed with the inner and outer guide walls will constitute a muffler for blocking noise. While when the air flow from a diffuser will flow through the return path, air is fed from the space section to balance the air flow thus to prevent separation.
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