VENTILATOR PROPELLER BLADE AND METHOD OF ITS FABRICATION

Propelersko krilo (1) ventilatora koje obuhvaća propelersku lopaticu (2) i propelersko vratilo (3) načinjeno od plastičnog materijala ojačanog vlaknima, pri čemu je propelersko krilo (1) integralna komponenta u jednom komadu koja sadrži krilnu stijenku (30), koja oblikuje komoru i načinjena je od plastičnog materijala ojačanog vlaknima, te ima laganu jezgru (24) koja ispunjava komoru, dok je propelersko krilo (1) ojačano prema propelerskom vratilu (3) s kontinuiranim ili stepenastim povećanjem debljine krilne stijenke i povećanjem slojeva vlakana u krilnoj stijenci, naznačeno time, da je propelersko vratilo (3) obloženo višeslojnom cjevastom netkanom građom (15) koja oblikuje područje preklapanja s gornjim i/ili donjim pokrovnim slojevima (17a, 17b) i/ili s krajnjim vlaknastim trakama (19). Patent sadrži još 7 patentnih zahtjeva. Production of a ventilator propeller vane, containing a blade and a shaft of fiber-reinforced plastics (FRP), as a unitary, integral construction with a chamber wall of FRP filled by a lightweight core (24), involves placing the core, covered with a fibrous structure, in the cavity of a multi-part mold (20); closing the mold; injecting a flowable resin matrix is injected to impregnate the fibrous structure; and demolding the dimensionally stable, solidified product. An independent claim is included for a ventilator propeller vane as above, where the vane is strengthened up to the shaft by a continuous or stepwise increase in wall thickness and an increase in the number of fibrous layers in the wall.