JP6463848B2 - Wheel disc assembly with easy-to-install seal plate - Google Patents

Description

  The present invention relates to a wheel disk assembly comprising a wheel disk and a plurality of blade devices fixed to the wheel disk and a plurality of seal plates fixed to an annular slot of the wheel disk according to the preamble of claim 1.

  A wheel disc assembly of the type mentioned at the beginning is known in the prior art in a very wide variety of embodiments, in which the wheel disc extends in the direction of the disc axis on the outer circumference. A plurality of blade root positioning slots are provided. The blade device is located there by the blade root. To cover the end face of the blade root positioning slot, a seal plate is inserted and, for this purpose, is typically attached to an annular slot. Patent Document 1 discloses a typical example of this. In this case, the wheel disc has an inner annular slot that surrounds and opens outwardly, where the end of the seal plate facing the disc axis is fixed axially. On the opposite outer end of the seal plate is provided an outer annular slot that opens inward. The outer annular slot is formed by blade devices adjacent to each other in the circumferential direction.

  During installation, the blade device is inserted into the blade root positioning slot of the wheel disc, and subsequently the seal plate is also inserted between the two annular slots. In order to introduce the last two blade devices, all the seal plates must already be pre-installed, and within the annular slot by an overlap of the seal plates by the distance that the blade device is installed in the relevant slot of the wheel disc. Must be moved with. The seal plate is then pushed back to the specified position in the circumferential direction, where it is properly fixed against movement in the circumferential direction.

  The disadvantage of the known wheel disc assembly is that it is difficult to remove the sealing plate during service, since two adjacent blade devices, which are actually very expensive, must first be removed. .

UK Patent Application Publication No. 905,582

  From this prior art, the object of the present invention is to create a wheel disc assembly of the type mentioned at the outset in which a higher flexibility is achieved with regard to the mounting of the seal plate.

  A typical wheel disc assembly includes a wheel disc, a plurality of blade devices, and a plurality of seal plates. In this case, the wheel disc has a blade positioning portion arranged on the outer periphery. The blade device is fixed here in a removable and circumferentially distributed manner. In addition, the wheel disc has an annular projection at an axial distance from the blade positioning portion. An annular slot is disposed between the blade positioning portion and the annular protrusion. The edge region directed towards the disc shaft attaches the seal plate to the annular slot and is axially fixed by the blade positioning portion and the annular projection. The disc axis clearly coincides with the central rotational axis of the rotor disc. The edge region of the seal plate is adjacent to the end of the seal plate, the end of the seal plate being directed to the disc axis and extending perpendicularly in a radial direction corresponding to the arrangement in the annular slot.

  To achieve the object, according to the present invention, the annular slot is expanded axially by at least one recess defining a seal plate mounting area. In this respect, the recess extends axially from the annular slot to the blade positioning portion and / or the annular projection. In this case, the length of the recess in the circumferential direction needs to be longer than the length of the seal plate in the edge region.

  Such a recess allows the seal plate to be screwed into the associated annular slot in a simple manner, even if all the blade devices are already attached to the wheel disc, resulting in a very flexible way. Installation is designed. In this case, the seal plate can be inserted into the recess, for example, obliquely from above by means of the edge region, and the seal plate can be tilted in the direction of the wheel disc. Thereafter, the seal plate can be moved circumferentially along the annular slot. Similarly, the individual seal plates can be removed in a simple manner in the reverse order.

  In the first case, it is essentially irrelevant whether the annular slot is segmented and / or discontinuous, and a discontinuous region is not necessary for mounting the seal plate. In a simple and particularly advantageous embodiment, apart from the recess, the annular slot in the cross section is always a surrounding design.

  According to one embodiment of the invention, all seal plates are designed in the same way as identical parts, so that the manufacture and storage of the seal plates is simplified.

  It is also particularly advantageous if the recess extends radially towards the disc axis. That is, the recess over a limited length enlarges the axial and radial cross section of the annular slot.

  As a result of the enlargement provided both axially and radially by the recess, a convenient free space for the attachment of the seal plate by the edge region is created. In particular, it is possible to initially insert the seal plates into the recesses so that these seal plates are arranged closer to the disc axis than the position corresponding to the final position. Thereafter, the seal plate can be moved outwards in the radial direction and thus can be repositioned to its final position.

  The annular projection on the side facing the annular slot advantageously has a bevel in the area of the recess, and the bevel is designed so that the annular projection is flattened towards the annular slot. Such a slope also simplifies the insertion and removal of the seal plate in the area of the recess.

  According to an embodiment of the invention, the annular projection on the side facing the annular slot has a cavity-shaped undercut area in the recessed area that opens towards the annular slot.

  Two recesses are advantageously provided which are formed in the wheel disk diametrically opposite each other. The second recess can avoid imbalances during the specified installation of the wheel disc assembly. Furthermore, the seal plate can be installed and removed more quickly. It is also conceivable to provide a large number of recesses distributed over the outer periphery in a rotationally symmetrical manner with respect to the disk axis.

  According to one embodiment of the invention, the annular slot is of an undercut design and has at least one retaining projection that projects axially in the direction of the seal plate when viewed in cross section. The retaining protrusion is selectively disposed corresponding to the blade positioning portion and / or the annular protrusion and is disposed radially outward of the annular slot. In this case, the holding projection has a holding surface on the side facing the annular slot, that is, the disk axis. In the first case, it is irrelevant whether the holding projection is provided on one side or both sides and whether one holding surface or a plurality of holding surfaces is provided on the holding projection. Embodiments having a retaining projection extending circumferentially along the annular slot, on which the retaining surface is constructed, are suitable and advantageously simple. Correspondingly, the seal plate in the edge region has at least one axially extending support projection provided with a support surface. Thus, the edge region with the support projections serves as a thickened portion for the region of the seal plate that is radially outward of the edge region.

  The holding surface of the holding protrusion and the supporting surface of the supporting protrusion are such that the supporting surface of the seal plate is supported against the holding surface of the holding protrusion under the influence of centrifugal force during the specified operation of the wheel disc assembly. Composed. According to this embodiment, the natural weight of the seal plate under the influence of centrifugal force is absorbed by the wheel disc, so that the blade device is released from the load.

  At least one filling piece configured in the recess is preferably provided. The filling piece prevents the seal plate from accidentally slipping out of the annular slot or partially deforming the seal plate in such a position that the seal plate is arranged over a part of the length of the recess area. be able to. In order to achieve this purpose, it is necessary for the filling piece to abut the seal plate.

  In this case, on the one hand, it is expedient for the filling piece to abut axially against the edge region of the seal plate by means of a contact surface extending in the radial direction. Thus, axial fixation of the seal plate is ensured in the area of the recess.

  Furthermore, it is advantageous for the filling piece to have an axially extending contact surface directed radially outwards against which the inner circumference of the seal plate abuts. Correspondingly, the seal plate in the region of the recess can be supported on the filling piece, so that the seal plate can be used, for example, when the disc assembly is stationary, especially when the recess extends radially to the wheel disc. Does not move toward the disc axis.

  The filling piece is advantageously designed so that the slope provided on the annular projection is filled. As a result, on the one hand, imbalances due to material gaps that would otherwise be present on one side can be prevented, and in particular when the load is applied in the axial direction, better support of the filling piece by the seal plate Is provided.

  Furthermore, if a cavity is provided that opens towards the recess, it is advantageous for the filling piece to protrude relative to this cavity. Due to the undercut design in this region, the cavity achieves radial fixation of the filling piece.

  In a particularly advantageous embodiment, the blade device has annular slot segments each extending around the disk axis and radially open towards the disk axis. In this case, the seal plate is accommodated in the annular slot segment at its outer periphery, and in this case is fixed in the axial direction. In this case, it is irrelevant whether the sealing plate is provided with further contours arranged axially adjacent to the outer circumference considered here. Instead, it is essential to fix the position of the seal plate on the outer circumference in the direction of the disk axis.

  Considering a convenient recess extending radially on the wheel disc, the mounting method is such that the seal plate first descends into the recess and moves radially outward on the wheel disc after pivoting or pushing. can get. Thereby, the insertion of the seal plate into the annular segment by the outer periphery is executed. In this case, whether the sealing plate is accommodated in each case in an annular slot segment or whether the sealing plate is conveniently arranged over the blade device and engages in this respect with an adjacent annular slot segment Is irrelevant.

  The seal plate advantageously has in each case a circumferential movement lock that holds the corresponding seal plate in a designated position during a designated use of the wheel disc assembly, thereby preventing circumferential movement.

  According to one embodiment of the present invention, the seal plate has a hole, the wheel disc has an associated opening, a connecting member extending through the hole engages the associated opening, and the process Conveniently secured to the seal plate inside. By fixing the connection member to the seal plate, unnecessary weakening of the wheel disk due to a notch effect or the like can be prevented.

  The openings are expediently designed in the form of elongated holes extending in the radial direction. Correspondingly, the seal plate can be moved radially outward under the influence of centrifugal force during the specified use of the wheel disc assembly.

  According to an embodiment of the invention, the first annular slot and / or the support projection and / or the plurality of edges and corners of the filling piece are provided with radii. As a result of such a radius, weakening of the corresponding component as a result of the notch effect is avoided.

  The invention further provides a method of installing a wheel disc assembly according to the invention, wherein all blade devices are fixed to the wheel disc in a first step and a seal plate is attached in a further step.

  Further features and advantages of the present invention will become apparent from the following description with reference to the accompanying drawings.

Figure 3 shows a perspective view of a wheel disc assembly. FIG. 4 shows a perspective view of a wheel disc in a recessed area. Figure 2 shows a cross-sectional view through a wheel disc in the area of the recess. FIG. 3 shows a view similar to FIG. 2 with the seal plate inserted. Figure 5 shows an enlarged perspective section through a recess with a sealing plate and an inserted filling piece. FIG. 6 shows a cross-sectional view of the embodiment of FIG. FIG. 6 shows a side view of the filling piece of FIG. 5. FIG. 6 shows a perspective view of FIG. 5. Fig. 6 shows a perspective cross section similar to Fig. 5 with an alternative design of recesses and filling pieces.

  1 to 8 show a wheel disc assembly 1 and its components according to a first embodiment of the present invention. The wheel disc assembly 1 includes a wheel disc 2, a plurality of blade devices 3 fixed along the outer periphery to a blade positioning portion 24 of the wheel disc 2 associated with an axially extending blade root positioning slot 4, and a radial direction. And a plurality of seal plates 5 held between the wheel disc 2 and the blade device 3 in annular slot segments 6 and 7. The annular slot 6 is in this case provided in the wheel disc 2 and is bounded axially outside by a continuous annular projection 8. On the opposite side, an annular slot segment 7 is formed in each of the blade devices 3.

  The annular slot 6 provided in the wheel disk 2 has an undercut design, and has a holding projection 9 protruding in the axial direction when viewed in cross section. The projection 9 is provided with a holding surface 10. . Correspondingly, when viewed in cross section, the seal plate 5 has an axially projecting support projection 11 designed to correspond to the holding projection 9 in the edge region of the inner diameter. A support surface 12 is provided.

  In order to facilitate the mounting of the seal plate 5, two recesses 13 (one recess 13 of which is shown in the figure) that are diametrically opposed and of the same design are provided in the annular slot 6. And each define a seal plate positioning region. The length of the circumferential recess 13 is longer than the length of the seal plate in the edge region accommodated in the annular slot 6. The recess 13 extends in the axial direction and widens the annular slot 6. The annular projection 8 on the side facing the first annular slot 6 in the region of the recess 13 has a slope 14 which is designed so that the annular projection 8 is flat towards the annular slot 6. Yes.

  The wheel disc assembly 1 also comprises a filling piece 15 which is designed to fill the area widened by the recess 13 with respect to the annular slot 6 and the area of the bevel 14. Furthermore, the filling piece 15 has a projection 16 which is axially away from the annular projection 8 and extends under the seal plate, so that the projection is positioned as an inner peripheral edge of the at least one seal plate 5. A functioning axially extending contact surface is defined. A recess 13 that also extends radially to the wheel disc 2 interrupts the base of the annular slot 6 that is otherwise provided in such a way that it encloses for seating of the seal plate 5. The axial contact surface forms a basically flush seat of the seal plate 5 in the region of the recess 13.

  Each of the seal plates 5 is designed in the same manner and includes a hole 17, and in a specified mounting state of the wheel disc assembly 1, a connecting member 18 of basically a pin-like design extends through the hole 17, and the connecting member 18 is fixed to the associated seal plate 5 and engages an opening 19 in the form of a radially extending elongated hole formed in the wheel disc 2.

  During the installation of the wheel disc assembly 1, all blade devices 3 are attached to the wheel disc 2 in a first step. In further steps, the seal plates 5 are attached one after the other. To achieve this purpose, each sealing plate 5 is inserted into the recess 13 from above by its edge region and tilted in the direction of the wheel disc 2. Thereafter, the seal plate 5 is moved upwards, ie radially outward, inserted into the annular slot segment 7 by the outer circular peripheral edge and guided in a manner guided between the annular slot 6 and the annular slot segment 7. It is moved in the circumferential direction. In this case, first the individual seal plates 5 are delimited by the recesses 13 after the last installation of the seal plates 5 by pressing them onto the other seal plates in a circumferential direction in a region where they overlap each other. The seal plate mounting part becomes free. In a further step, the filling piece 15 is inserted into the recess 13. Next, the seal plates 5 arranged adjacent to the recesses 13 are pressed against each other in the circumferential direction so as to be located at half of the protrusions 16 of the filling piece 15. Here, the filling piece 15 is fixed against accidental detachment by the overlapping seal plate 5. In a further step, the connecting member 18 is pushed through the hole 17 in the seal plate 5, and the connecting member 18 engages with an associated opening 19 arranged in alignment with the hole 17. The connecting member 18 is fixed to the seal plate 5 by peening, for example. Here, the seal plate 5 is fixed against inadvertent movement in the circumferential direction.

  During a specified operation of the wheel disc assembly, centrifugal force acts on the seal plate 5 to move the seal plate 5 radially outward and the connecting member 18 is guided inside the associated opening 19. The radially outward movement of the seal plate 5 is limited by the support projections 11 formed on the seal plate 5 as soon as the support surface 12 of the support projections 11 abuts the holding surface 10 of the holding projections 9 of the wheel disk 2. The In this state, the wheel disc 2 absorbs the force generated by the natural weight of the seal plate 5.

  An important advantage of the wheel disc assembly 1 described above is that the recess 13 causes the seal plate 5 to be screwed into the associated annular slots 6 and 7 in a simple manner even if all blade devices 3 are already attached to the wheel disc 2. As a result, the mounting is designed to be very flexible. Similarly, the seal plate can be removed in a simple manner. A further advantage is that by means of the wheel disc 2 by means of the holding projections 9 provided on the wheel disc 2 and the support projections 11 formed on the seal plate 5 the forces generated by the centrifugal force as a result of the natural weight of the seal plate 5 As a result, the load on the blade device 3 during operation of the wheel disk assembly 1 is greatly reduced.

  FIG. 9 shows an alternative embodiment of the recess 20 and the filling piece 21 inserted into the recess 20. The recess 20 has the recess 13 described in that the annular projection on the side facing the annular slot 6 in the region of the recess 20 has an undercut region with a cavity 22 open towards the recess 20. Is different. The filling piece 21 differs from the filling piece 15 in that the filling piece fills the undercut region, ie the cavity 22, and in contrast to the filling piece 15, from the annular projection on which the seal plate 5 is seated. There are no protrusions 16 facing away. Otherwise, the embodiment shown in FIG. 9 corresponds to the wheel disc assembly 1 described above, and the same components or parts are identified with the same names.

  Although the present invention has been fully illustrated and described in detail by way of the preferred exemplary embodiments, the present invention is not limited by the disclosed examples and departs from the scope of protection of the present invention. Rather, other variations may be derived by those skilled in the art.

DESCRIPTION OF SYMBOLS 1 Wheel disk assembly 2 Wheel disk 3 Blade apparatus 4 Blade root positioning slot 5 Seal plate 6,7 Annular slot 8 Annular protrusion 9 Holding protrusion 10 Holding surface 11 Supporting protrusion 12 Support surface 13 Recess 14 Slope 15 Filling piece 18 Connecting member 19 Opening 20 Recess 21 Filling piece 22 Cavity 24 Blade positioning part

Claims (11)

A blade positioning portion (24), at least one annular projection (8) spaced axially, and at least one annular slot (6) defined between said blade positioning portion (24) and said annular projection (8) A wheel disk (2) having a plurality of blade devices (3), a plurality of blade devices (3) fixed to the blade positioning portion (24) in a circumferentially distributed manner, and a plurality of blade devices (3) A wheel disk assembly (1) having a plurality of seal plates (5) axially fixed in said annular slot (6) by edge regions directed towards the disk axis Because
A recess (13, 20) extending from the annular slot (6) in the axial direction into the blade positioning part (24) and / or into the annular projection (8), in the circumferential direction The length of the recess is characterized by a recess (13, 20) corresponding at least to the length of the edge region of the seal plate (5) ;
The annular protrusion (8) has a cavity (22) that opens toward the recess (20), and the cavity (22) is formed as an undercut of the annular protrusion (8), and the seal Wheel disc assembly (1) , characterized in that it receives said filling piece for fixing in a radial direction the filling piece for fixing the plate (5 ).   The wheel disc assembly (1) according to claim 1, characterized in that the recess (13, 20) further extends from the annular slot (6) towards the disc axis.   Wheel disc assembly (1) according to claim 1 or 2, characterized in that the annular projection (8) has a bevel (14) inclined towards the recess (13, 20). The wheel disk assembly according to any one of claims 1 to 3 , characterized in that two or more recesses (13, 20) arranged in a rotationally symmetrical manner with respect to the disk axis are provided. (1). The blade positioning portion (24) and / or the annular protrusion (8) are arranged radially outward of the annular slot (6), extend axially to the seal plate (5), and the annular slot Protrusion having a holding projection (9) with a holding surface (10) directed towards (6) and at least one side of which the sealing plate (5) has a support surface (12) facing radially outward The support protrusion (11), wherein the support surface (12) contacts the holding surface (10) when centrifugal force is applied to at least the seal plate (5). The wheel disc assembly (1) according to any one of claims 1 to 4 . 6. Any one of claims 1 to 5 , characterized by a filling piece (15, 21) arranged in the recess (13), partially extending in the circumferential direction and abutting against the seal plate (5). A wheel disc assembly (1) according to any one of the preceding claims. 7. A wheel disc according to claim 6 , characterized in that the contact surface extending in the radial direction and / or the contact surface extending in the axial direction of the filling piece (15) abuts on the seal plate (5). Assembly (1). The filling piece (15) protrudes into the slope (14) inclined towards the recess (13, 20) and / or into the cavity (22) opened towards the recess (20). A wheel disc assembly (1) according to claim 6 or 7 . Each of the blade devices (3) has an annular slot segment (7) that opens radially toward the disk axis, and axially extends into the annular slot segment (7) at the outer periphery of the seal plate (5). characterized in that it is fixed to, according to any one of claims 1-7 wheel disc assembly (1). At least one seal plate (5), characterized in that fixed in the circumferential direction by a circumferential movement lock, according to claim 1 of any one of 9 wheel disc assembly (1). At least one sealing plate (5 ) has a hole (17) for circumferential fixation, and the wheel disc (2) has an associated opening (19), a connecting member (18) 11. Wheel disc assembly (1) according to claim 10 , characterized in that is engaged with the opening (19) through the hole (17).

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