• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The invention relates to a plug (50) for preventing corrosion of a fixing orifice (22), comprising: ▪ a lower face (51) comprising an opening (60) intended to receive a head (27) of screwing means (23), ▪ an upper face (52), ▪ a substantially cylindrical side wall (53) extending between the lower face (51) and the upper face (52), said side wall (53). comprising a first lateral zone (66) characterized in that: ▪ the plug (50) consists of an elastically deformable material, and has a diameter (Db) at rest and an elasticity allowing it to obstruct and be maintained in an upper part (22b) of the fixing orifice (22) by elastic deformation, ▪ the upper face (52) comprises at least a first blind hole (64, 94) whose shape is such that when the plug (50 ) is elastically deformed causing a bead between the upper face (5 2) and the first lateral region (66) of the plug (50), said bead is eliminated by elastic deformation of said first blind hole (64, 94).
    公开号:FR3032223A1
    申请号:FR1550822
    申请日:2015-02-03
    公开日:2016-08-05
    发明作者:Pierrick Chevallier；Patrick Jean-Louis Reghezza
    申请人:SNECMA SAS；
    IPC主号:
    专利说明:

    [0001] TECHNICAL FIELD OF THE INVENTION The field of the invention relates to the field of turbomachine rectifiers and more particularly to the stator vanes. BACKGROUND OF THE INVENTION A turbofan engine 10 for aerospace propulsion is shown schematically in Figure 1. It comprises a fan 11 delivering a flow of air, a central portion, called FP primary flow is injected into a compressor 12 which feeds a turbine driving the blower 11. The peripheral portion, called secondary flow FS, of the air flow is ejected towards the atmosphere to provide a portion of the thrust of the turbomachine 10, after having crossed a blade crown disposed downstream of the fan 11. This ring, called rectifier 14 (also known by the acronym OGV for "Outlet Guide Vane") allows to straighten the air flow at the outlet of the fan 11 while by limiting the losses to the maximum. Figure 2a schematically illustrates a blade 20 of rectifier 14 including a body 30 and a foot 21, while Figure 2b is an enlargement of the foot 21 of said blade 20 along a cutting plane A-A. The vanes of the rectifier 14 are intended to be fixed on a hub 15. For this purpose, the root 21 of the vane 20 has two fixing orifices 22 situated on either side of the body 30, enabling the receiving means to be received. screwing to mechanically connect the blade 20 to the hub 15. An attachment hole 22 in which is positioned a screwing means 23 is shown in FIG.
    [0002] Each fixing orifice 22 comprises: a cylindrical lower portion 22a opening at a lower surface 25 of the root 21 of the blade 20, adapted for the passage of a rod 24 of the screwing means 23, a cylindrical upper portion 22b opening at an upper surface 26 of the foot 21, adapted for the passage of a head 27 of the screwing means 23, a shoulder 28 between the upper part 22b and the lower part 22a, such that the upper part 22b has a diameter Ds greater than the diameter Di of the lower part 22a. In addition, a ring or cup 29 is intended to be positioned in the upper part 22b between the head 27 of the screwing means 23 and the shoulder 28, as shown in FIG. 3. The cup 29 makes it possible to avoid the matting or marking of the shoulder 28 by the screwing means 23.
    [0003] However, it has been found corrosion at the fixing holes 22, explained by the presence of stagnant water in the upper portions 22b of said orifices 22. A first solution to this problem is to reform the mounting holes, then possibly to put in place bushings in said orifices. However, once these repairs are made, the water can again stagnate in the upper parts of the fixing holes and thus cause corrosion of the fixing holes again. In addition, successive repairs end up weakening the blade root, which impacts its life. A second solution is to fill the upper parts of the fixing holes (once the blade is in position on the hub) with a silicone compound known by the acronym RTV Silicone for "Room Temperature Vulcanizing" in order to plug said orifices . However, the use of this silicone-based compound requires a long drying time and therefore causes an increase in the duration of assembly operations. The use of silicone for filling the fixing holes also increases the disassembly time, especially during maintenance operations because it is necessary to remove the compound and clean the orifices before reassembly.
    [0004] A third solution is described in the patent application FR No. 1454953. According to this third solution, and with reference to FIGS. 4a and 4b, shutters 31 are used to fill the upper portions 22b of the fixing orifices 22 after the mounting of the stator vanes 20 on the hub 15. A shutter 31 comprises a plug 32 and a suitable cup 35. The head of the screwing means is intended to be placed in the cup 35 and to be covered by the cap 32. Furthermore, the cup 35 is intended to be held fixed in the fixing hole 22 by means of pins 36. A slot 34 formed on a side wall of the cup 35 guides the plug 32 by interlocking and sliding a protruding portion 33 of the plug 32 in the slot 34. This male-female system allows to ensure the correct positioning of the plug 32 in the fixing orifice 22.
    [0005] Such a shutter however has drawbacks: - it is necessary to modify the cups usually used, making lights in said cups, and equipping pawns, it is necessary to perform two holes in the lower part of the in the upper part of the orifice via the pins, the contact surface between the plug and the outside diameter of the fixing orifice is small, which allows the water to infiltrate around the cap and may cause the cap to disengage during operation of the turbomachine. GENERAL DESCRIPTION OF THE INVENTION In this context, the aim of the invention is to provide a solution for preventing corrosion of a fixing orifice of a stator blade root, which is simple and quick to implement, and does not require modification of the fixing orifice or the cup. According to a first aspect, the invention therefore relates to a plug for preventing corrosion of a fixing orifice, comprising: - a lower face comprising an opening for receiving a head of a screwing means, - an upper face, - a substantially cylindrical side wall extending in an axial direction between the lower face and the upper face, said side wall comprising a first lateral zone.
    [0006] In addition, the plug is made of an elastically deformable material, and has a diameter at rest and elasticity allowing it to obstruct and be maintained in the fixing hole by elastic deformation. In addition, the upper face comprises at least a first blind hole whose shape is such that when the plug undergoes an elastic deformation showing a bead between the upper face and the first lateral zone of the plug, said bead is eliminated by elastic deformation of said first blind hole. The plug according to the first aspect of the invention solves the aforementioned problems.
    [0007] Indeed, the cap is composed of an elastically deformable material, for example an elastomer, which allows its simple and rapid introduction into a hole of appropriate size by elastic deformation. By choosing a plug whose resting dimensions are slightly greater than those of the orifice, the plug is inserted compressed into the fixing orifice, then relaxes after its introduction. The cap then completely obstructs the orifice to prevent the infiltration of water therein, thus avoiding its corrosion. By "at rest" is meant the state in which the plug is located when it is not deformed. In addition, the dimensions and the material used make it possible to avoid disengagement of the plug during operation of the turbomachine. In addition, the first blind hole makes it possible to eliminate the beads of material that form when the plug is in position in the orifice. In addition, the first blind hole allows the plug to be removed using an appropriate removal tool, which makes the plug easily removable and interchangeable. Finally, no modification of the orifice and the cup is required. Indeed, the plug inserted into the orifice is sufficient to obstruct the latter.
    [0008] The plug according to the first aspect of the invention may also have one or more of the features below, considered individually or in any technically possible combination. According to a non-limiting embodiment, the first blind hole comprises a blind end portion inclined relative to the first lateral zone.
    [0009] This configuration is such that when the plug undergoes an elastic deformation showing a bead between the upper face and the first lateral zone of the plug, said bead is removed by deformation of said first blind hole. According to a non-limiting embodiment, the angle of inclination of the blind end portion relative to the first lateral zone is substantially between 80 and 100 degrees, preferably 90 degrees. This is the optimal configuration to remove material bumps from the plug. According to a non-limiting embodiment, the first blind hole has an opening end portion, said opening end portion having a slot shape.
    [0010] Thus, the tip of a withdrawal tool introduced into the opening end portion engages directly in the blind end portion of the first hole by rotation of the removal tool. It is noted that the opening end portion is advantageously oriented in the orifice so that when the tip of the withdrawal tool is wedged in the blind end portion, the cap is removable without the tool being impeded by the blade. Indeed, the tool then has only one degree of freedom: only rotations of the tool in a plane parallel to the pale are possible. This prevents the pale is damaged or is an obstacle to the removal of the cap. According to a non-limiting embodiment, the upper face comprises a second blind hole, said second blind hole being diametrically opposed to the first blind hole.
    [0011] The second blind hole is such that when the plug undergoes an elastic deformation showing a bead between the upper face and a second lateral zone of the side wall diametrically opposite the first side wall, said bead is removed by deformation of said second blind hole. Thus, beads of material that appear after insertion of the plug into the fixing hole are removed on both sides of the plug. According to a non-limiting embodiment, the first blind hole is positioned in the center of the upper face, and has a cylindrical opening portion followed by a cylindrical blind portion, the blind end portion having a diameter greater than the diameter of the opening end portion. .
    [0012] Thus, when the lower face and the upper face of the plug are parallel, the plug can be positioned in the orifice in any orientation because it is symmetrical. This configuration makes it possible to avoid any placement error when mounting the plug in the fixing orifice. The blind end portion being of greater diameter than that of the opening end portion, a wedging of the tip of the withdrawal tool in the blind end portion is possible. Moreover, the mold used for the manufacture of such a cap is simple to make. According to a non-limiting embodiment, the side wall comprises a succession of circumferential corrugations and perpendicular to the axial direction of said plug.
    [0013] The corrugations present on the side wall of the plug make it possible to improve the strength and adhesion of the plug in the fastening orifice. In addition, such corrugations can avoid material beads that appear when the cap is held tight in the orifice. According to a non-limiting embodiment, the material constituting the plug has a hardness substantially between 30 and 80 shores. Thus, the plug has a hardness such that it is not damaged by environmental constraints, in particular during the operation of the turbomachine. The hardness of the plug also allows it to not be broken or torn by the screwing means or by the removal tool when removed from the fixing hole. With such a cap, the life of the screwing means and the part with the orifice is increased. The invention also relates to a closure system comprising: - an aperture for fixing a blade root, the fixing orifice comprising an upper part - a plug according to the first aspect. By foot, indifferently means the radially inner platform or the radially outer platform of the blade 20 when it is in position in the turbomachine 10.
    [0014] The plug is of external shape substantially complementary to the shape of the upper part of the fixing orifice and external dimensions at rest greater than the dimensions of said upper part. Such a system makes it possible to mount the stopper tightly in the orifice, thus preventing the penetration of water into the orifice and thus the corrosion of the screwing means or of said orifice. According to a non-limiting embodiment, the upper face of the plug is inclined relative to the lower face so that when the plug is placed in the orifice, the upper face of the plug is in the geometric continuity of the blade root. An advantage of such an asymmetrical geometry is to avoid any disturbance of the aerodynamic flow at the foot of the pale, the upper face of the plug being in line with that of the foot of pale. According to a non-limiting embodiment, the upper face of the cap comprises visual cues for placing the plug in the upper part of the fixing orifice in a predetermined position.
    [0015] Thus, since the cap is not symmetrical, the visual cues help to correctly place the plug in the hole and thus avoid any error during assembly. In one embodiment, the visual cues include an arrow to indicate the direction in which the cork must be placed, for example a direction in which the arrow points to the front of the engine. Such visual cues and ensure a good aerodynamic flow at the foot of the pale. According to a non-limiting embodiment, the system comprises a screwing means comprising: a rod intended to be positioned in a lower part of the fixing orifice; a head intended to be positioned in the upper part of the orifice of fixing and blocked by a shoulder between the lower part and the upper part, and the opening on the underside of the cap has a geometry substantially complementary to that of the head of the screwing means. Such an opening makes it possible to guarantee the maintenance of the screwing means in the lower face of the plug by means of a slightly tightened mounting while avoiding the rotation of the plug during the operation of the turbomachine. Indeed, during its operation, said turbomachine generates vibrations propagating in particular at the level of the rectifier. Moreover, said opening also makes it possible to avoid material bulges at the opening. According to a non-limiting embodiment, the system comprises a cup adapted to be held against the shoulder of the fixing orifice by the head of the screwing means, and in which: the rod of the screwing means is positioned in the lower part of the fixing orifice, the cup is held against the shoulder of the fixing orifice, the head of the screwing means is positioned and locked in the upper part of the fixing orifice against the cup, - The cap covers the head of the screwing means, the bottom face of the plug and the cup being separated by a non-zero distance. A cup positioned in the blind bore of the fixing orifice between the screwing means and the shoulder of said orifice makes it possible to avoid the caulking or the marking of the pieces. Indeed, during operation, a turbomachine produces vibrations propagating in particular in the fixing hole and giving rise to a friction zone between the screwing means and the shoulder. The cup avoids this friction and thus increase the life of the pale.
    [0016] Such a system makes it possible to protect the fixing orifice, the cup and the screwing means against any external aggressions such as ingestions of chippings, sand etc. Moreover, the system makes it possible to preserve the lubricating grease placed between the rod of the screwing means and the lower part of the fixing orifice. In addition, the presence of a space between the underside of the plug and the cup avoids the formation of material beads of the plug. The invention will be better understood in the light of the description which follows and with reference to the figures listed below.
    [0017] BRIEF DESCRIPTION OF THE FIGURES The figures are presented for guidance only and in no way limiting. FIG. 1, already described, schematically represents a turbomachine with a double flow comprising a rectifier. FIG. 2a, already described, schematically represents a blade of the straightener shown in FIG. 1. FIG. 2b, already described, is an enlargement of a root of the blade shown in FIG. 2 in a sectional view, the foot having two fixing holes. Figure 3, already described, is an enlargement of a blade root attachment hole shown in Figure 2b, in which is placed a screwing means and a cup.
    [0018] Figure 4a, already described, is an exploded view of a shutter of the prior art intended to be housed in a fixing hole shown in Figure 2b. Figure 4b, already described, schematically shows the assembled shutter shown in Figure 4a. FIG. 5a is seen from above of the blade root of FIG. 2b, and of a closure system comprising a plug according to a first embodiment of the invention. Figure 5b is a side view of the elements of Figure 5a. Figure 6 shows a bottom face of a plug of the system of Figures 5a and 5b. Figure 7 shows an upper face of the plug of Figure 6. Figure 8a shows the sealing system of Figures 5a and 5b being positioned in a fixing hole of Figure 2b.
    [0019] Figure 8b is an enlargement of a portion of the plug shown in Figure 8a, undergoing elastic deformation forming a bead. Figure 8c shows the portion of the plug shown in Figure 8b, the bead having been removed.
    [0020] Figures 9a, 9b and 9c schematically show steps of extracting the plug of Figure 5a by a removal tool. Figure 10a is a side view of a cap according to a second embodiment of the invention. FIG. 10b shows a closure system comprising the plug of FIG. 10a, positioned in a fixing orifice of FIG. 2b. FIG. 11 represents a closure system comprising a plug according to a third embodiment of the invention, positioned a fixing orifice of FIG. 2b. Figure 12 shows an upper face of a plug according to a fourth embodiment of the invention.
    [0021] FIG. 13 schematically represents a closure system comprising the plug of FIG. 12, positioned in a fixing orifice of FIG. 2b. DETAILED DESCRIPTION OF EMBODIMENTS OF THE INVENTION Unless otherwise specified, the same element appearing in different figures has a unique reference.
    [0022] The invention relates to a plug for preventing the corrosion of a fixing orifice of a foot of a stator blade such as the fixing orifice 22 of the foot 21 of the blade 20 previously described and illustrated in FIG. 2b. . Figures 5a and 5b show said foot 21 in perspective according to two viewing angles: the upper surface 26 of the foot 21 is visible in Figure 5a, while the lower surface 25 of the foot 21 is visible in Figure 5b. As explained above, the foot 21 has two fixing orifices 22 located on either side of the body 30 of the blade 20. Each fixing orifice 22 is intended to receive a screwing means as well as a cup such as the screwing means 23 and the cup 29 previously mentioned and illustrated in Figure 3. Said screwing means 23 and said cup 29 are visible in Figure 5b. In addition, each fixing orifice 22 has a cylindrical lower portion 22a opening at the lower surface 25, and a cylindrical upper portion 22b opening at the upper surface 26. The upper portion 22b has a diameter Ds greater than the diameter Di of the lower part 22a so as to form a shoulder 28 between the lower portion 25 and the upper portion 26 serving to support the cup 29 and the head 27 of the screwing means 23. Figures 5a and 5b also show a cap 50 according to a first embodiment. Said cap 50 is shown more precisely in FIGS. 6 and 7, on which are visible respectively a lower face 51 and an upper face 52 of said plug 50. The plug 50 is of external shape substantially complementary to the shape of the upper part 22b of the fixing orifice 22 and outer dimensions at rest greater than the dimensions of said upper portion 22b. Thus, the plug 50 is of generally cylindrical general shape, and extends in an axial direction X. In other words, the plug 50 has a generally cylindrical side wall 53 extending in the axial direction X between its lower face 51 and its upper face 52. However, the lower face 51 and the upper face 52 of the plug 50 are slightly inclined relative to each other. In other words, the lower face 51 and the upper face 52 of the plug 50 are not parallel to each other. This configuration is advantageous because the lower surface of the root 21 of the blade 20 and the shoulder 28 are not perfectly parallel to each other. Placing the upper face 52 of the plug 50 in the extension of the upper surface 26 of the foot 21 of the blade 20, as can be seen in FIG. 8a, makes it possible to prevent the flow of air flowing at the level the upper surface 26 of the foot 21 of the blade 20 is disturbed by geometric discontinuities. It should be noted that in other embodiments, the lower face 51 and the upper face 52 are substantially parallel with respect to each other, to the detriment of the quality of the aerodynamic flow in the secondary vein. These configurations, however, make it possible to limit the risks of incorrect positioning of the plug 50 in the upper part 22b of the fixing orifice 22. Moreover, the upper face 52 of the plug 50 comprises a visual cue 54 making it possible to place the plug 50 in the upper portion 22b of the fixing hole 22 in a predetermined position. Indeed, when the upper face 52 and the lower face 51 of the plug 50 are not symmetrical, the visual reference 54 can help to correctly place the plug 50 in the upper part 22b of the fixing orifice 22 and thus avoid any mistakes during assembly. For example, the front or rear of the turbomachine is indicated by the tip of an arrow shown on the upper face 52 of the cap 50. It is noted that such a visual cue 54 is optional. In addition, the plug 50 is composed of an elastically deformable material, for example an elastomer, which allows it to be held in a tight position in the upper part 22b of the fixing orifice 22. state of rest, that is to say in the state in which the plug 50 is not subjected to external stresses, the diameter Db of the plug 50 is slightly greater than the diameter Ds of the upper part 22b of the fixing orifice 22. Thus, it is necessary to compress the stopper 50 to introduce it into the upper part 22b of the fixing orifice 22. When the stopper 50 is positioned in the upper part 22b of the fixing orifice 22 it seeks to relax and presses on the walls of the fixing orifice 22, preventing the infiltration of water around the plug 50. The contact surface between the plug 50 and the walls of the upper part 22b of the fixing orifice 22 is then optimal. Note that the material constituting the plug 50 is also impervious, to prevent the introduction of water into the fixing orifice 22 through the plug 50. In addition, the plug 50 has an opening 60 formed on its underside 51 The opening 60 is intended to receive the head 27 of the screwing means 23. As can be seen in FIG. 6, the opening 60 has cavities 61 intended to match the shape of the head 27 of the screwing means 23. In other words, the opening 60 made on the lower face 51 of the plug 50 has a geometry substantially complementary to that of the head 27 of the screwing means 23. Thus, the plug 50 fits perfectly, and advantageously according to a slightly tightened mounting, on the head 27 of the screwing means 23 to abut on the end portion of said head 27. An optimal maintenance of the cap 50 on the head 27 of the screwing means 23 is ensured, and rotations or movements of said plug 50 during operation of the turbomachine are avoided. Moreover, such a configuration makes it possible to avoid material bulges that could appear with a mounting comprising a plug 50 whose opening 60 on the lower face 51 would not be complementary to that of the head 27 of the screwing means 23.
    [0023] It should be noted that in other embodiments, the opening 60 does not have any cavities 61: the opening 60 is for example cylindrical. The manufacturing mold of the plug 50 is then simplified. Furthermore, the plug 50 has a circumferential rounding 68 between the upper face 52 and the side wall 52, as can be seen in FIGS. 7 and 8a. In addition, the cap 50 has a first blind hole 64 and a second blind hole 64 'formed on the upper face 52 of the cap 50 and diametrically opposed. The blind holes 64, 64 'are useful for removing bumps of material that could appear on the plug 50 at the rounded portion 68, more precisely in the free space between the rounded portion 68 and the periphery of the top portion 22b. of the fixing orifice 22. Providing a free space at this point allows the bead to be channeled in order to avoid any material overflow which would create an irregularity of the aerodynamic flow in the secondary vein. The first blind hole 64 is of a shape such that when the plug 50 undergoes an elastic deformation showing a bead between the upper face 52 and a first lateral zone 66 of the plug 50 located near said first blind hole 64 said bead is eliminated by elastic deformation of said first blind hole 64. Similarly, the second blind hole 64 'is of a shape such that when the plug 50 undergoes an elastic deformation showing a bead between the upper face 52 and a second lateral zone 66' of the plug 50 located near said second blind hole 64 'said bead is removed by elastic deformation of said second blind hole 64'. More precisely, with reference to FIG. 8a, the first blind hole 64 has an emergential end portion 80 on the upper face 52, and a blind end portion 81. The emergential end portion 80 extends parallel to the first lateral zone 66 of the On the contrary, the blind end portion 81 is inclined with respect to the first lateral zone 66 and towards the first lateral zone 66, with a first angle of inclination of substantially 90 degrees. The first blind hole 64 thus delimits a first hook 82 of material of which a first portion 88 extends along the first lateral zone 66 and a second portion 89 extends along the upper face 52 of the plug. When the first hook 82 of material undergoes deformation creating a bead at the intersection between the first portion 88 and the second portion 89, the second portion 89 pivots towards the lower face 51 of the plug 50, penetrating into the first blind hole 64. The bead is thus eliminated. Similarly, with reference to FIGS. 8a, the second blind hole 64 'has an emergent end portion 80' on the upper face 52, and a blind end portion 81 '. The emergent end portion 80 'extends parallel to the second lateral zone 66' of the plug 50. On the contrary, the blind end portion 81 'is inclined with respect to the second lateral zone 66' and toward the second lateral zone 66 ', a second angle of inclination a' worth substantially 90 degrees. The second blind hole 64 'thus delimits a second hook 82' of material of which a first portion 88 'extends along the second lateral zone 66' and a second portion 89 'extends along the upper face 52 of the 50. Referring to Figure 8b, when the second hook 82 'of material undergoes a deformation creating a bead 95 at the intersection between the first portion 88' and the second portion 89 ', the second portion 89' pivots in the direction the lower face 51 of the cap 50, penetrating into the second blind hole 64 ', as shown in Figure 8c. The bead 95 is thus eliminated. Note that in the embodiment shown in FIG. 8a, the first blind hole 64 and the second blind hole 64 'are substantially diametrically opposed with respect to one another: the first blind hole 64 and the second blind hole 64 'are substantially symmetrical in central symmetry of X axis and 180 degree angle. The beads of material are thus eliminated on either side of the plug 50. In addition, the blind holes 64, 64 'are useful for removing the plug 50 via a withdrawal tool 90 (shown in FIGS. 9a, 9b and 9c). To remove the plug 50 from the upper part 22b of the fixing orifice 22, the withdrawal tool 90 is inserted in the end-opening portion of a blind hole 64, 64 'and wedged in the blind end portion 81, 81 ', as shown in Figure 9b. A rotation of the withdrawal tool 90 then allows the cap 50 to be removed. It can be seen in FIG. 7 that the emergent end portion 80, 80 'is slit-shaped. Such a shape makes it possible to properly place the tip of the withdrawal tool 90 (such as a flat screwdriver) so that the location of the blind end 81, 81 'is easily identifiable, and thus facilitate the removal of the plug 50 Furthermore, by the configuration of the blind holes 64, 64 ', the withdrawal tool 90 has only one degree of freedom. Thus, by placing the plug 50 in the fixing orifice 22 so that the slot extends orthogonally to the body 30 of the blade 20, the withdrawal tool 90 can only perform rotations in a plane parallel to the body 30 of the blade 22 during the removal of the cap 50. The body 30 of the blade 22 does not therefore constitute an obstacle for the removal of the plug 50, and is not likely to be damaged.
    [0024] It should be noted that in other embodiments, the opening end portions 80, 80 'of the first and / or second blind hole (s) 64, 64' have (have) a shape different from that of a slot. , for example a cylindrical or arcuate shape, at their (their) end (s) opening (s). In other embodiments, the cap 50 has on its upper face 52 a greater number of blind holes 64, 64 ', for example three or four, in order to remove beads appearing in different places of the side wall 53 of the In other embodiments, the emergent end portion 80, 80 'and the blind end portion 81, 81' of the first blind hole 64 and / or the second blind hole 64 'are in continuity one of the other, that is to say oriented in the same and single inclination. It is important that the angle of this inclination allows a sufficient lever arm to remove the plug 50 with the removal tool 90, and allows the first blind hole 64 and / or the second blind hole 64 'to deform to absorb any bumps. It is also important that the configurations of the first blind hole 64 and second blind hole 64 'are simple to avoid complicating the completion of the plug.
    [0025] FIG. 9 illustrates an embodiment in which the plug 50 has successive corrugations 92 on its lateral wall 53, said corrugations 92 being circumferential and substantially perpendicular to the axial direction X of said plug 50. Such corrugations 92 make it possible to improve the holding and adhesion of the stopper 50 in the upper part 22b of the fixing orifice 22. FIG. 10 shows the stopper 50 in position in the upper part 22b of the fixing orifice 22. It is noted that the number of 92 corrugations differs according to the embodiments, depending on the size of the cap 50 for example. FIG. 11 shows another embodiment of the plug 50 according to the invention, in position in the upper part 22b of the fixing orifice 22. The upper face 52 of said plug 50 is curved. Such a configuration makes it possible to avoid any placement error when mounting the plug 50 in the upper part 22b of the fixing orifice 22 and does not require the addition of visual markers 54 on the upper face 52 of the plug 50. , the aerodynamic flow in the vein is deteriorated because of the geometrical discontinuity between the plug 50 and the upper surface 26 of the foot 21 of the blade 20.
    [0026] Figures 12 and 13 show an alternative embodiment of the plug 50 according to the invention. The plug 50 has only one blind hole 94, in the center of the upper face 52 of the plug 50. Said blind hole 94 comprises two parts: an emergential end portion 95 on the upper face 52, and a blind end portion 96. Said parts 95, 96 are of cylindrical shape, the emergential end portion 95 having a diameter greater than the diameter of the blind end portion 96. It is therefore possible to wedge the tip of the withdrawal tool 90 in any direction in the Blind end part 96. The placement errors of the plug 50 in the upper part 22b of the fixing orifice 22 are also reduced, since the plug 50 is symmetrical. In addition, such a cap 50 is achievable with a simple mold. However, the aerodynamic flow in the vein is deteriorated because of the geometrical discontinuity between the plug 50 and the upper surface 26 of the root 21 of the blade 20.
    权利要求:
    Claims (10)
    [0001]
    REVENDICATIONS1. Stopper (50) for preventing corrosion of an upper portion (22b) of a fixing orifice (22), comprising: - a lower face (51) comprising an opening (60) intended to receive a head (27) of a screwing means (23) has an upper face (52); - a substantially cylindrical side wall (53) extending in an axial direction (X) between the lower face (51) and the upper face (52); ), said lateral wall (53) comprising a first lateral zone (66) characterized in that: - the plug (50) consists of an elastically deformable material, and has a diameter (Db) at rest and an elasticity allowing it to obstruct and be held in the upper part (22b) of the fixing orifice (22) by elastic deformation, - the upper face (52) comprises at least a first blind hole (64, 94) whose shape is such that when the plug (50) undergoes an elastic deformation showing a bead between the upper face (52) and the first lateral region (66) of the plug (50), said bead is eliminated by elastic deformation of said first blind hole (64, 94).
    [0002]
    2. Stopper (50) according to claim 1, characterized in that the first blind hole (64) comprises a blind end portion (81) inclined relative to the first lateral zone (66).
    [0003]
    3. Stopper (50) according to any one of claims 1 to 2, characterized in that the first blind hole (64) has a vented end portion (80), said emergential end portion (80) having a slot shape.
    [0004]
    4. Stopper (50) according to any one of claims 1 to 3, characterized in that the upper face (52) has a second blind hole (64 '), said second blind hole (64') being diametrically opposed to the first blind hole (64, 94).
    [0005]
    5. Stopper (50) according to claim 1, characterized in that the first blind hole (94) is positioned substantially in the center of the upper face (52), and has a cylindrical opening portion (95) followed by a blind portion cylindrical (96), the blind end portion (96) having a diameter (D1) greater than the diameter (D2) of the opening end portion (95).
    [0006]
    6. Stopper (50) according to one of claims 1 to 5, characterized in that the side wall (53) comprises a succession of undulations (92) circumferential and substantially perpendicular to the axial direction (X) of said plug (50). ).
    [0007]
    Closure system comprising: - a mounting hole (22) for a root (21) of a blade (20), the fixing orifice (22) comprising an upper part (22b) - a plug ( 50) according to claims 1 to 6, characterized in that the plug (50) is of external shape substantially complementary to the shape of the upper part (22b) of the fixing orifice (22) and of diameter (Db) at rest above the diameter (Ds) of said upper portion (22b).
    [0008]
    Closure system according to Claim 7, characterized in that the upper face (52) of the plug (50) is inclined with respect to the lower face (51) so that when the plug (50) is placed in the upper part (22b) of the orifice (22), the upper face (52) of the plug (50) is in the geometric continuity of the foot (21) of the blade (20).
    [0009]
    9. Shutter system according to claim 8, characterized in that the upper face (26) of the plug (50) comprises visual markings (54) for placing the plug (50) in the upper part (22b) of the fixing orifice (22) according to a predetermined position.
    [0010]
    10. Shutter system according to one of claims 7 to 9, characterized in that it comprises a screwing means (23) comprising: - a rod (24) intended to be positioned in a lower portion (22a) of the fixing orifice (22) - a head (27) intended to be positioned in the upper part (22b) of the fixing orifice (22) and blocked by a shoulder (28) between the lower part (22a) and the upper part (22b), the opening (60) made on the lower face (51) of the plug (50) having a geometry substantially complementary to that of the head (27) of the screwing means (23).
    类似技术:
    公开号 | 公开日 | 专利标题
    EP3253951B1|2020-10-21|Corrosion protection plug for filling an attachment opening, and system including said plug
    EP2425100B1|2015-02-18|Fan blade retainer with an elastomer
    EP1792110B1|2009-04-15|Gland seal and corresponding assembly
    EP2839116B1|2016-05-04|Method and tooling for assembling a guide vane stage
    EP1535840B1|2006-10-04|Arrangement for aircraft comprising a device for mounting a fairing between a nacelle of an aircraft engine and a pylon
    CA2867548C|2020-02-18|Method for disassembling a reinforcement from a part
    EP1517004B1|2014-12-17|Rotor wheel for a turbomachine and assembly method therefor
    FR2918409A1|2009-01-09|Rotating part i.e. fan, for turbine engine of aircraft, has blade with circumferential projection detected in continuity of adjacent platform forming sector, where projection participates in definition of inter-blade surface
    EP2878873B1|2017-02-22|Cartridge-type quick-coupling device
    FR2933955A1|2010-01-22|DEVICE FOR ATTACHING A VARIABLE SHIFT BLADE
    FR2911632A1|2008-07-25|Fan rotor disc for jet engine of aircraft, has axial grooves mounting and retaining vane roots, and deformable zones radially located outside grooves, where zones are placed at rear end of grooves
    EP2947328B1|2018-12-05|Microfan with improved seal for medical ventilator and method for assembling the same
    EP2633218B1|2014-09-17|Assembly having sealing gasket with locking insert
    FR2890105A1|2007-03-02|Retention ring immobilization device for e.g. engine of aircraft, has stops positioned such that stops are stopped respectively against immobilization hooks, and slot covered by other hook when retention ring is placed in groove
    EP3185086B1|2019-06-12|Timepiece dial applique
    EP3312384A1|2018-04-25|Rotary assembly of a turbine engine provided with a system for axial retention of a blade
    EP2932051A1|2015-10-21|Removable acoustic panels for turbojet engine casing
    EP2900927B2|2021-04-21|Self-clamping fastener for cmc turbine blade
    FR3056653A1|2018-03-30|CUP FOR PROTECTING A TURBOMACHINE PIECE FASTENING HOLE, PROTECTIVE SYSTEM THEREFOR
    FR3052822A1|2017-12-22|TURBOMACHINE DAWN EQUIPPED WITH AN ELASTOMER SEAL
    FR3067070A1|2018-12-07|SYSTEM FOR CUTTING A PLUG CLOSING A FIXING POSITION OF A DAWN FOOT ASSEMBLY AND METHOD FOR CUTTING THEREOF
    EP2944723B1|2017-07-12|Tactile stud
    FR3095368A1|2020-10-30|PROCESS FOR REPAIRING A BLADE IN COMPOSITE MATERIAL
    FR3101616A1|2021-04-09|Method and device for installing a fitting for positioning a fan cowl.
    FR3086693A1|2020-04-03|SHIM FOR TURBOMACHINE, ASSEMBLY FOR TURBOMACHINE, TURBOMACHINE AND ASSOCIATED METHOD
    同族专利:
    公开号 | 公开日
    FR3032223B1|2017-02-10|
    EP3253951B1|2020-10-21|
    CN107407157B|2020-04-07|
    WO2016124853A1|2016-08-11|
    US20180023405A1|2018-01-25|
    CN107407157A|2017-11-28|
    EP3253951A1|2017-12-13|
    US10724388B2|2020-07-28|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    DE2539551A1|1975-09-05|1977-03-10|Hermann Schmidt|Self locking nut and bolt assembly - employs bolt with additional thread of opposite pitch for locknut|
    US4850778A|1988-07-27|1989-07-25|Trw, Inc.|Push-on fastener|
    DE10156876A1|2001-11-20|2003-06-05|Seppelfricke Armaturen Gmbh &|Lock system, for a screw bolt and nut, has a shrouding cap with elastic ratchet locks to click into a lower washer requiring its destruction for access to the bolt|
    JP2006242339A|2005-03-04|2006-09-14|Thk Co Ltd|Bolt hole concealing cap|
    JP2009127729A|2007-11-22|2009-06-11|Nsk Ltd|Cap for mounting hole and linear motion guide device equipped with it|FR3056653A1|2016-09-29|2018-03-30|Safran Aircraft Engines|CUP FOR PROTECTING A TURBOMACHINE PIECE FASTENING HOLE, PROTECTIVE SYSTEM THEREFOR|
    CN108119255A|2016-11-29|2018-06-05|福特环球技术公司|Stud engagement engine lid recess plug|
    FR3081187A1|2018-05-17|2019-11-22|Safran Aircraft Engines|CUP FOR PROTECTING A MOUNTING LAMINATE WITHOUT INTERFERENCE|
    FR3082228A1|2018-06-08|2019-12-13|Safran Aircraft Engines|TURBOMACHINE PART COMPRISING A WASHER COOPERATING WITH A BLADE|US2663451A|1951-10-10|1953-12-22|Chandler P Yarnall|Closure plug|
    FR1454953A|1965-11-29|1966-02-11|Method and device for transferring dough pieces, for example from one machine to another|
    US4355729A|1981-01-15|1982-10-26|Maguire Daniel J|Single service childproof closure|
    US4696398A|1984-10-17|1987-09-29|Steinmetz Jr Floyd|Free drop liquid container with extendable spout|
    US4620641A|1985-12-12|1986-11-04|General Motors Corporation|Access plug for threaded holes in electric starting apparatus|
    US5480273A|1994-09-07|1996-01-02|Jou; Yuch-Chiou|Bolt assembly|
    US6293744B1|2000-06-14|2001-09-25|Illinois Tool Works Inc.|Fastener system including a fastener and a cap|
    US6964549B2|2002-03-25|2005-11-15|Fallon Phoenix P A|License plate mounting fastener|
    US6769563B2|2002-10-30|2004-08-03|L.L. Culmat, L.P.|Molded aerosol can cap|
    GB0820850D0|2008-11-14|2008-12-24|Domino Printing Sciences Plc|Improvements in or relating to inkjet printing|
    US8333537B2|2009-05-22|2012-12-18|Hutchinson, Sa|Nut looseness indicator and dust cap|
    TWI526633B|2013-01-15|2016-03-21|直得科技股份有限公司|Bolt-hole cap for bolt hole in linear rail|FR3048448B1|2016-03-02|2018-03-30|Safran Aircraft Engines|SEAL CAP FOR LOW PRESSURE COMPRESSOR DRUM, LOW PRESSURE COMPRESSOR DRUM AND TURBOMACHINE|
    FR3067070B1|2017-06-01|2020-01-03|Safran Aircraft Engines|SYSTEM FOR CUTTING A PLUG CLOSING A FASTENING ORIFICE FOR A BLADE BLADE ASSEMBLY AND ASSOCIATED CUTTING METHOD|
    WO2021223037A1|2020-05-08|2021-11-11|Intercrate Container Corp.|Glare screen system|
    法律状态:
    2016-02-08| PLFP| Fee payment|Year of fee payment: 2 |
    2016-08-05| PLSC| Publication of the preliminary search report|Effective date: 20160805 |
    2017-02-01| PLFP| Fee payment|Year of fee payment: 3 |
    2018-01-23| PLFP| Fee payment|Year of fee payment: 4 |
    2018-06-29| CD| Change of name or company name|Owner name: SAFRAN AIRCRAFT ENGINES, FR Effective date: 20170719 |
    2020-01-22| PLFP| Fee payment|Year of fee payment: 6 |
    2021-01-20| PLFP| Fee payment|Year of fee payment: 7 |
    2022-01-19| PLFP| Fee payment|Year of fee payment: 8 |
    优先权:
    申请号 | 申请日 | 专利标题
    FR1550822A|FR3032223B1|2015-02-03|2015-02-03|ANTI-CORROSION PLUG FOR FILLING A FASTENING ORIFICE AND SYSTEM COMPRISING SAID PLUG|FR1550822A| FR3032223B1|2015-02-03|2015-02-03|ANTI-CORROSION PLUG FOR FILLING A FASTENING ORIFICE AND SYSTEM COMPRISING SAID PLUG|
    PCT/FR2016/050217| WO2016124853A1|2015-02-03|2016-02-02|Corrosion protection plug for filling an attachment opening, and system including said plug|
    EP16707862.5A| EP3253951B1|2015-02-03|2016-02-02|Corrosion protection plug for filling an attachment opening, and system including said plug|
    CN201680015484.4A| CN107407157B|2015-02-03|2016-02-02|Corrosion-resistant plug for filling an attachment opening, and system comprising said plug|
    US15/548,285| US10724388B2|2015-02-03|2016-02-02|Corrosion protection plug for filling an attachment opening, and system including said plug|
    [返回顶部]