| 摘要 |
1,196,094. Axial-flow compressors and turbines. SOC. NATIONALE D'ETUDE ET DE CONSTRUCTION DE MOTEURS D'AVIATION. Feb.22, 1968 [Feb. 27, 1967], No.8659/68. Headings F1C and F1T. In an axial-flow multi-stage fluid handling machine, such as a compressor or a turbine, including two interleaved contra-rotating rotors of which the outer rotor comprises rows of blades permanently secured to the inner surface of a shell, the inner rotor comprises axially stacked discs rigid with a common shaft and to the outer periphery of which the inner rotor blades are removably secured through elongated sections each rigid with a root adapted to be secured to the corresponding disc and with a platform rigid with the actual blade and lying in alignment with the inner platforms of the outer rotor blades lying to either side of the inner rotor blades considered, the platforms bounding inwardly the fluid-flow through the machine. The outer rotor comprises blades 2 which may each be provided with an outer platform 5, the platforms of each row of blades being welded together to form a transverse element 6, 7, 8 or 9 of an annular shell 1. The inner rotor comprises blades 4 each having a platform 4a and an elongated inner section 4c terminating in a root 4b. A locking tongue 22 is fitted tightly into an axially extending groove in each root 4b, with a projection 22a entering a peripheral groove 4e. To assemble the inner rotor, the blades 4 of the first row RI, are temporarily supported by an annular assembly jig 23 which may be formed with peripherally spaced slots 23a each engaging a pair of grooves formed in the sides of the section 4c of each blade. The jig 23 is itself supported by its engagement within the row RE 2 of blades 2 of the outer rotor. The rotor disc 24 which is to carry the first inner blade row RI, is then moved in the direction f 4 until it is within the blade row RI. Locking tongues are then turned down at f 5 to secure the blades 4 on the disc 24. The jig 23 is then removed. Any disc associated with the following outer blade row RE 2 is then inserted and secured by locking tongues similar to the locking tongues 22. The operation is repeated for the following stages. The discs of the inner rotor are secured to a central shaft while any discs of the outer rotor may be journalled on the shaft. |
