| 摘要 |
FIELD: mechanics, heating. ^ SUBSTANCE: one-piece spiral air duct incorporates a curvilinear box and rectilinear connecting boxes arranged on both ends of the aforesaid curvilinear box. Note here that the curvilinear box is made integral with the connecting rectilinear boxes in a spiral manner so as to avoid joints. ^ EFFECT: ease of manufacture, higher quality and efficiency, longer life. ^ 6 cl, 9 dwg |
