FR2514409A1 - DEVICE FOR IMPLANTING AUBES IN SECTIONS ON A TURBOMACHINE ROTOR DISK - Google Patents

Abstract

LAYING OF AUBES IN SECTORS ON A TURBOMACHINE ROTOR DISC. THE AUBES SECTOR 1 HAS A SINGLE FOOT 3 WHICH HAS AT LEAST ONE CIRCULAR RIB 5, 6 WHICH IS ENGAGED IN A CIRCULAR THROAT 7, 8 PROVIDED ON THE UPPER FACE OF THE RIM OF DISC 9, THIS SEGMENT BEING MAINTAINED IN SUPPORT AGAINST THE DISC 9 BY A FLANGE 10 FIXED ON THE UPSTREAM SIDE OF THE DISC. THE INVENTION IS USED FOR THE REALIZATION OF TURBOMACHINE ROTORS.

Description

Device for planting blades in sectors on a

Turbomachine rotor disk.

  The present invention relates to a device for im-

  blade area planting on a turbomachine rotor disk. The casting of turbomachine blades by sectors makes it possible to lower the cost price, to achieve a more sealed vein by eliminating numerous vanishing points, and

  to increase the life of the blades because the

  many blades at a time on a single foot provides better vibration resistance and better

impact resistance.

  The use of blades in sectors is practically generalized in turbine distributors or rectifiers On the other hand, as regards the rotors, their use

  is still very limited because of the difficulties

  in the design and construction of fasteners.

  According to a known means, a "hammer" fastener is used, so that the blade is slid through a window in a groove of the tail-shaped disk.

  this throat is difficult to

  If large areas of blades are used, then the window is necessarily large and

  its filling can not be achieved in a simple way.

  On the other hand, the presence of this large window of

  mension introduces very poor form factors.

  to the life of the disc.

  take the circumferential effort due to penetration into

  abradable organs or shocks, during impacts.

  There are also sectors of blades which are mounted on the disc by so-called fir feet, however such a device allows to use a limited number

of blades for each cluster.

  The present invention relates to a blade sector fixing device that overcomes these disadvantages. According to the present invention, the blade sector comprises a single foot which has at least one circular rib cooperating with at least one circular groove provided on the upstream face of the disk rim, said sector being held in abutment against the disk by a

  flange fixed on the upstream side of the disc.

  Other features and advantages of the invention are

  will be better understood by reading the description that will

  follow of several embodiments and with reference to the accompanying drawings, in which: Figure 1 is a perspective view of a blade sector and its fixing means; FIG. 2 is a perspective view of a disk

  rotor having the securing means of a sec-

blade maker;

  FIG. 3 is a radial sectional view of a section

  blade nozzle mounted on a rotor disk; Figure 4 is a perspective view of a holding flange; Figure 5 is a radial sectional view of another embodiment of the fastening means; Figure 6 is a perspective view of an embodiment of the bead of a blade sector portion; Figure 7 is a perspective view of a blade section without peripheral heel; Figure 8 is a perspective view of an embodiment of a seal; Figure 9 is a radial sectional view of another embodiment of a fastener according to the invention.

  Figures 1 and 3 show a sector 1 comprising

  in particular six blades 2 which are connected to their ends.

  mitted by a single foot 3 and a peripheral heel 4.

  The foot 3 of the blade sector has two circular ribs

  5, 6 which are radially and longitudinally offset

  and which are respectively engaged in circular grooves 7, 8 provided on the upstream face of the rim

  a disk 9 (FIGS. 2 and 3) of a turbomachine rotor.

  The set of sectors 1 is locked axially by a flange 10 fixed by means of bolts 11 on the disk 9, said flange being supported by a lip 12 (FIGS. 3 and 4) against the upstream face of the foot 3 of the sectors 1 A U-shaped sealing ring 13 (FIGS. 3 and 8) is arranged in a housing formed between the flange

  and the upstream face of the foot 3 sector.

  On the upstream face of the foot 3, it is planned for its part

  lower central one tooth 14 (Figures 1 and 3) constitutes

  killing a circumferential stop of the sectors which is engaged in a housing 15 (Figure 4) formed on the downstream face of the flange 10 In the radial faces of the foot 3 and the heel 4, at their ends, are provided grooves

  16, 17 in which metal plates are engaged in

  18, 19 which ensure radial sealing between

  adjacent sectors The orientation of the lower platelets

  res 18, with a slight curvature, is such that

  contributes to a better impact on the air

  leaving the vein after cooling the foot 3 of the blades or -4-

the rim of the disc 9.

  FIG. 6 shows a bead of a portion of the blade sector, as a variant of that illustrated in FIG. 1. The Z configuration of the circumferential ends of the bead allows the assembly by interlocking of several sectors in succession. which is represented with only one dawn, could of course, with a heel of the same configuration, for example include six

blades as in Figure 1.

  The sector (FIG. 7) can comprise only one foot 3 comprising ribs 5 and 6, the upper part of the blades having no heel. Moreover, the heel 4 can have a straight section in cross-section (FIG. Z as in Figure 6 For the cooling of the foot 3, the blade 2 and the rim of the disk 9, there is provided in the foot 3, ducts 20, 21 (Figure 3) which open, a side in the annular capacity limited by the flange 10 and the disc 9 and, on the other side,

between the foot and the disc.

  FIG. 5 shows an alternative embodiment in which the foot 3 has only one rib 5 which is engaged in a circular groove 7 of the rim of the disc 9, and the lower face of the foot 3 comprises, downstream, a bearing 22 which bears in operation

  on a corresponding scope 23 of the disc 9.

  In the solution shown in FIG. 5, the blade 2 itself being cooled, there is provided a conduit 24 in the foot 3 which puts in communication the space between the flange 10 and the disc 9 This the central cavity 25 of dawn. In FIG. 9, an embodiment variant is shown.

  in which the only modified elements were

  schematically, and where it can be seen that the foot 'ns sec-

  blade driver comprises, on its upstream face, a groove 26 in which is embedded a tooth 27 provided on the flange 10 Of course, one could predict the tooth 27 on the foot 3 of the blade sector and the groove 26 on the

  flange 10 This provision ensures a better

  their retention of the blade sector and, in particular,

  the tilting induced by the centrifugal forces.

  The flange 10 is fixed by means of bolts on the disc 9 by means of spacers leaving a clearance for ventilation Alternatively, the spacer may be replaced by an excess thickness of the flange 10 having a milling

for ventilation.

  Of course, the invention is not limiting and those skilled in the art can make modifications without leaving

  for that, the field of the invention.

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Claims (1)

1 Device for the implantation of blades into sectors on a turbomachine rotor disk, characterized in that the blade sector (1) comprises a single foot (3) which has at least one circular rib (5, 6). cooperating with at least one circular groove (7, 8) provided on the upstream face of the disk rim (9), said sector (1) being held in abutment against the disk (9) by a flange (10) fixed on the upstream side of the disc. 2 Device according to claim 1, characterized in that, on its upstream face, the foot (3) of the blade sector has a tooth (14) of circumferential abutment which is engaged in a housing (15) provided on the inner face flange (10). 3 Device according to claim 1, characterized in that the foot (3) of the blade sector has two axially offset circular ribs (5, 6) which engage in two corresponding grooves (7, 8) provided on the upstream face of the disk rim (9). 4 Device according to claim 1, characterized in that the base of the blade sector (1) comprises a circular rib (5) which is engaged in a circular groove (7) provided on the upstream face of the disk rim (9). ), said foot having, on its underside and downstream of the rib, a bearing surface (22) which is operatively supported on a corresponding circular bearing surface (23) of the disc (9). Device according to any one of claims 1 to 4, characterized in that the radial faces of the foot (3) and the heel (4) of the blade sector have grooves (16, 17) in which are engaged radially sealing plates (18, 19) between the adjacent sectors. 6 Device according to claim 1, characterized in that the flange (10) has, on its rear face, a lip (12) by which it bears against the foot (3) of the blade sectors, an annular metal seal flexible (13) being inserted between the flange (10) and the upstream face of the foot (3) of the blades. 7 Device according to claim 1, characterized in that the sector (1) has a tooth (27) which is embedded in a groove (26) provided on the flange (10). 8 Device according to claim 1, characterized in that the flange (10) has a tooth (27) which is engaged in a groove (26) provided on the sector (1). 9 Device according to any one of claims 1 to 4, characterized in that the foot (3) of the blade sector comprises cooling air ducts (20, 21) which put into communication the delimited annular capacitance by the flange (10) and the disc (9) on the one hand, and an annular enclosure between the disc 9 and the circular rib 6 on the other hand. Device according to any one of the claims   1 to 4 and 7 and 8, characterized in that the foot (3) of the   dawn driver has ducts (24) which open into   the central cavity (25) of the blade (2) of the blade 2.