EP1969206A1 - Closing assembly for closing the gap remaining between the first and last blade of a blade ring that is inserted into the peripheral groove of turbomachinery and corresponding turbomachinery - Google Patents

Abstract

The assembly has front and rear side parts (30, 32), by which a projection of a peripheral nut (10) that is formed with an undercut is jammed. A protection unit (36) protects the side parts against unhinging from the peripheral nut. The protection unit is pin-like designed, where the side parts are detachably connected with each other in a force-fit manner. The protection unit is designed as intermediate parts that are inserted between the side parts.

Description

CLOSING ASSEMBLY FOR CLOSING THE REMAINING INTERMEDIATE SURFACE BETWEEN THE FIRST AND LAST SHOVELS OF A SHOVELING ROLL AND CORRESPONDING FLOW MACHINE USED IN A FORM OF A FLOW MACHINE

The invention relates to a closing assembly for closing 0 of the remaining intermediate space between the first and last inserted in a circumferential groove of a turbomachine ^¬ translated blade of a blade ring, comprising Minim ^¬ least two side parts, of which at least one forming with an undercut projection of the circumferential groove 5 verkakbar and at least one securing element which secures the parts against detachment from the circumferential groove.

Final assemblies of this type are disclosed, for example, in EP 1 457 642 A2 and US 2002/0127105 A1. Both 0-circuit assemblies consist substantially of two side parts, which is in the remaining intermediate space between the first and the last blade of a blade ring ^¬ sets are. Since each side part hooks each with a projection forming the undercut of the circumferential groove 5 and thus both side parts are introduced into the space, both side parts together - be ^¬ strchtet in the axial direction - narrower than the aufzufüllende and schlie ^¬ ßende gap. After the assembly of the two side parts in turn remains a space between them free, which must be filled with an intermediate part 0. The intermediate part ensures the two side parts against the respective Ver ^¬ hakung solved axial displacement and thus against disengaging from the circumferential groove. To secure the intermediate part against detachment, it is equipped with two lip-shaped webs, each of which is made of plastic

Deformation in a provided on each side panel bag ^{¬ be} bent. As a result, the intermediate part is positively locked with each side part, which also causes the two Side parts are kept in the circumferential groove. In addition, US 2002 / 0127105A1 proposes that the intermediate part is hooked by means of a dovetail with the first and the last blade of the blade ring, whereas according to EP 1 457 642 A1, each side part of the final assembly with the first and the last blade of the blade ring ver ^¬ is hooked. Thereby, a gap formation and enlargement between adjacent blades and the end assembly in the circumferential direction is substantially prevented.

A disadvantage of the known final assembly, however, is that to remove the final assembly this at least partially ^¬ must be consuming destroyed in the field of positive engagement. It should also be noted that the final assembly must withstand the occurring thermal and mechanical loads, in particular the centrifugal force occurring during operation, if it is mounted in the rotor of a turbomachine.

Furthermore, from the published patent application DE 29 34 298 a Schaufelfußverriegelung with a split nut formed from two elements known. The two elements are hooked in each case with one of the projections of the circumferential groove. By screwing in a grub screw, the two elements are kept at a distance and thus hooked.

Furthermore, from GB 659 592 a multi-part closing assembly is known, in which the parts can be used simultaneously in the remaining space. In this case, a screw is provided in the middle, conically shaped in cross-section intermediate part. The screw which is supported on the groove base can lift the intermediate part in the direction of the slot opening. Due to arranged on the side parts, corresponding to the intermediate part inclined side surfaces, these can be hooked securely each with the circumferential groove by lifting the intermediate part. In addition, DE 103 10 431 A1 discloses a rotor closure for rotors of thermal turbomachines, which consists of two end halves. The two end halves are connected by a dovetail attachment when installed. Here are the elements of

Dovetail so formed on the two halves that by a directed in the circumferential direction displacement of the two halves to each other to the dovetail suspension is made. As a result, it is necessary for the gap between the first and the last blade of a blade ring to be closed by the rotor closing so that a residual space seen in the circumferential direction remains. Thus, despite the use of the rotor closure of DE 103 10 431 Al, a further residual space remains between the blades used, which, however, can be distributed along the circumference of the circumferential groove.

Accordingly, the object of the invention is the creation of a final assembly for completely closing the remaining gap between the first and the last inserted in a circumferential groove of a turbomachine ^¬ blade of a blade ring, which is simple and inexpensive solvable and yet the high mechanical stresses reliable and durable endures.

To achieve the object, a gat ^¬ tungsgemäße final assembly is specified according to the invention, which is designed according to the features of claim 1.

According to the invention, the parts are successively inserted into the circumferential groove and then releasably connected together by means of a stiftarti ^¬ gen fuse element. So far in the prior art was the trained as an intermediate part finished fuse element held len between the Seitentei ^¬ form-fitting, so that the final assembly as a whole was secured against falling out of the circumferential groove. The invention is based on the knowledge that contrary to the usual Conceived a detachable connection of the parts of the final construction ^¬ group solves the task reliably. In addition, the final assembly can be detached from the circumferential groove non-destructively by also removing the securing element used with a suitable tool. Furthermore, all used ^¬, which saves the cost of parts already used once again. For example, the releasable connection can be made by a locking screw.

In addition, the invention for the first time also specifies a first embodiment in which only the first part inserted into the circumferential groove, for example the front side part, can be hooked with a projection of the circumferential groove. The second inserted, the rear side part of the rear ^¬ assembly used to cover the remaining opening of the gap after insertion of the first side part. Fer ^¬ ner prevents the second side part a displacement of the first side part, which could solve its entanglement. The acting on the two side parts of the final assembly

Centrifugal load is taken in total by the projection, which is hooked to the first side part. Following ^¬ Lich the hooked with the projection first side ^¬ part prevents the release of the final assembly as a whole from the circumferential groove.

In order to prevent an axially directed gap formation between two adjoining parts due to a game formation or due to the parts pressing apart parts securing element, these are positively interlocked with each other via a dovetail guide. The

Dovetail guide thus allows an entanglement of two adjacent parts of the final assembly, which ensures a detachable and, depending on the requirements, a particularly reliable frictional connection of the parts of the final assembly by means of the securing element. An unwanted release of the fuse element by moving away from each other Securing element encompassing parts is thus safely avoided.

Advantageous embodiments of the inventions are specified in the dependent claims.

Preferably, the dovetail guide is arranged in such a way on the parts of the final assembly, that engage in the radial insertion of the last part, the elements of the dovetail guide into one another. During the insertion of the last part of this is hooked together with the already used part or with the parts already used. This has the advantage that the closing assembly completely, that is to say in the circumferential direction, completely encloses the space to be filled of the circumferential groove. can fill without play. A displacement of the blades used in the circumferential groove both after assembly of the final assembly and during operation of the turbomachine can be safely avoided.

In the context of a second embodiment of the invention, the closing assembly comprises an intermediate part which can be inserted between the two lateral parts which can now be hooked up with the circumferential groove. Since each side part can be hooked in each case with a protruding on a side wall of the circumferential groove and protruding in the axial direction projection, and the two side parts are successively inserted into the circumferential groove, between these another space, which is filled by the subsequently inserted intermediate part. The filling of the further space prevents the displacement of the side parts in the axial direction, so that their secure entanglement remains ensured. The securing element is are angeord ^¬ net that both the two side parts detachably with- as well as the rule ^¬ Between the seats lying intermediate part of the closing assembly interconnected. The individual parts of the final assembly and these as a whole are then secured against detachment from the circumferential groove. A particularly advantageous security against disengaging from the circumferential groove is provided when the locking sub-assembly comprises a wide ^¬ res pin-like securing element, each of Be is ^¬ tenteil secured to the intermediate part by means of in each case one of the two pin-like securing elements. Thus verbin ^¬ det each securing member only two of the three parts of the closing assembly with each other, whereby the mechanical Bela ^¬ tung each securing element with respect to the embodiment with only one fuse element is low.

In a particularly advantageous embodiment of the invention, the two adjoining side parts or each side part lies against each other at the intermediate part in a contact plane, wherein the securing element or the securing elements extends or extend longitudinally within the contact plane. The fuse element is therefore arranged in half in the contact plane and connects two adjacent parts releasably together. As an alternative to the last-mentioned embodiment, the securing element or the securing elements can extend transversely through the contact plane, through one of the two or both contact planes.

A detachable final assembly can be achieved in particular advantageously with a non-positive connection. The force acting on the two frictionally interconnected side parts of the final assembly centrifugal load is taken in total by the projection or the projections, which is or which is hooked to the side part or the side parts.

A particularly easily detachable final assembly can be specified with a further embodiment in which the securing element is a locking screw. The fuse screw connects mindestes two parts of the fuse element ^¬ frictionally with each other. At least one threaded section for the locking screw is provided in each part of the final assembly. The aligned thread sections take a common locking screw for possibly frictionally connecting the parts, so that the locking screw extends transversely through the contact plane on which the two parts lie against each other. Alternatively, the thread over its entire height can be divided into two Gewindehälf ^¬ th, each half of the thread is disposed on one of the parts of the final assembly. By this is meant that each thread of the thread is divided into two halves, one half being provided at a first of two abutting parts in a contact plane and the other half of each thread being disposed at the second of the two abutting parts. Although the halves are designated as such, they do not have to be the same size.

By using a locking screw a special ^¬ DERS reliable and releasable and possibly positive connection of the parts of the closing assembly is given, which even with a force acting on the closing assembly Fliehkraftbe- a detachment of the parts utilization of the closing assembly from the circumferential groove prevented. In addition, the Siche ^¬ approximately bolt due to increased friction forces by the centrifugal force itself is secured against loosening.

In particular, the provision of the dovetail guide reliably prevents moving away from each other, the two threaded halves, whereby the release of the encompassed locking screw is reliably prevented.

In order to obtain a particularly aerodynamic surface of the final construction ^¬ group, which completes the opening of the gap at ^¬ approaching flush, the locking screw is designed as a grub screw so that the necessary for screwing and unscrewing approach for a turning tool no additional space required.

Particularly advantageous is the embodiment in which each part can be applied to a side wall, the one of the undercut forming projection of the circumferential groove is formed. This prevents that the entire circuit module as a unit can rotate within the circumferential groove, when the gap between the first and the last blade of the blade ring increases from unvorher ^¬ foreseeable reasons, in the circumferential direction. Even for this case, the proposed development provides a particularly reliable closing assembly secured against detachment from the circumferential ^groove .

To achieve a particularly reliable against disengaging from the circumferential groove to secure closing assembly ^¬ indicate the securing element may additionally be mechanically secured against loosening, for example by means of a Anstemmung. Typically, the closing assembly is provided for closing the interim ^¬ rule space of a circumferential groove which is arranged in a rotor of a turbomachine.

The further explanation of the invention will be made with reference to the embodiments illustrated in the drawings.

Show in detail

1 shows a circumferential groove in a cross-sectional view with a consisting of two side parts and a fuse ^¬ element final assembly,

2 shows the final assembly of FIG 1 in a ^plan view,

3 shows a second embodiment of the final assembly with a three parts of the final assembly obliquely durchgreifendem fuse element,

4 shows a third variant of the invention with a comprehensive three parts and two fuse elements final assembly, 5 shows the plan view according to FIG 4 and

6 shows the plan view according to FIG 4 in another

Design variant.

FIG. 2, FIG. 5 and FIG. 6 each show a section of a plan view of a circumferential groove 10 into which moving blades 12a, 12b of an axial compressor of a gas turbine are inserted. Instead of the compressor, the invention could also be used in a steam turbine or in a turbine unit of the gas turbine.

The endless circumferential groove 10 is provided on an outer surface 11 of the rotor of the compressor. The circumferential groove 10 could also be provided on an annular inner housing of the compressor, are mounted in the guide vanes. As viewed in the axial direction of the rotor, the peripheral groove 10 has a front side wall 16 and a rear side wall 18, on each of which projections 20, 22 extending in the circumferential direction and extending in the axial direction are arranged, each having a front and a rear undercut 24 , 26 form (FIG. 1, FIG. 3 and FIG. 4).

In the circumferential groove 10 blades 12a, 12b is einge- which have blade roots to the undercuts 24, 26 korrespondie ^¬ rend executed, hammer shaped. For assembly, the blades 12a, 12b inserted into the circumferential groove 10 and then so far, for example, rotated by 45 ° or 60 ° until the hammer-shaped blade roots, the projections 20, 22 engage behind.

The remaining between the first blade 12a and the last blade 12b gap, the otherwise fully equipped with blades 12 of a blade ring and possibly interposed intermediate elements circumferential groove must be called by means of a special device, the final assembly 33, paddle lock or rotor-end will be closed.

The first embodiment of the He ^¬ invention shown in Figures 1 and 2 is essentially characterized by the fact that the closing assembly comprises only a front side portion 30 and a rear side part 32, wherein only the front side member 30 with the projection 20 of the circumferential groove 10 is hooked. The front side part 30 is seen in cross-section (FIG 1) C-shaped and has an outer arm 50 and an inner arm 52, which are connected to each other via a radially extending web 54. The inner arm 52 engages the undercut 24, which is formed by the projection 20. Consequently, the arm 52 on the projection 20 and prevents the falling out of the circumferential 10. The rear side portion 32 closes the Publ ^¬ voltage of the gap 28 after the front side member has been inserted into the space 28 of the circumferential groove 10 30th The first embodiment of the invention is characterized in particular by the fact that the rear side part 32 viewed in cross-section is only L-shaped and not, like the front side part 30, C-shaped. The rear side part 32 does not engage in the undercut 26 and is not hooked to the projection 22.

The front side part 30 is, as shown in FIG 2, hooked with the rear side ^¬ ter part 32 via a dovetail guide 46 with positive locking. The dovetail guide 46 comprises two elements, a recess with undercuts and a correspondingly formed extension, the undercuts the

Recess can engage behind. One of each of the elements is provided on one of the dovetail guide parts. Both the recess with the undercuts and the extension have an outline in the form of a dovetail seen in cross-section - ie perpendicular to the guide direction.

The dovetail guide 46 of the end assembly 33 is so aligned, that during the radial insertion of the rear side part 32 in the circumferential groove 10 this is hooked with the already inserted front side part 30. The dovetail guide 46 prevents possible gap formation between the two side parts 30, 32.

The front side member 30 and the rear side portion 32 lie ^¬ gene in a plane of contact 48 to each other. In the contact plane 48, an internal thread 61 having bore 62 is provided, in which the formed as a locking screw 64

Secured element 36 is screwed. The internal thread 61 is arranged in half in the front side part 30 and in the rear side part 32. Half means that one half of each Ge ^¬ windegangs of the internal thread 61 on the front side part 30 and the other half of each thread on the rear side part 32 is formed.

By screwing a trained example of a grub screw locking screw 64 into the internal thread 61, the two side parts 30, 32 are releasably connected to each other again. The grub screw can be clamped in the expiring internal thread 61 to form a particularly high frictional engagement. Due to the axial gap formation between the two parts 30, 32 prevented by the dovetail guide 46, the locking screw 64 is reliably screwed into the internal thread 61, although this is formed by two separate parts 30, 32.

The assembled closing assembly 33 is about the Verha- kung of the front side member 30 with the projection 20 as

Entire held in the circumferential groove 10 and thus secured against loosening ^¬ out of the circumferential groove 10.

The rear side part 32 is held securely despite the absence of Verhink- with the projection 22 in the circumferential groove, since the forces acting on the rear side part 32 centrifugal forces are transmitted by means of the locking screw 64 on the front side part 30, so that the rear side part 32 indi- rect also from the projection 20, which serves as an abutment for the interlocked inner arm 52 is worn.

Although the forces acting on the locking screw 64 and to the two side parts 30, 32 centrifugal force prevents an automatic disengagement of the locking screw 64, this can become ^¬ additionally secured by a Anstemmung again against unscrewing, whereby a secure especially against disengaging from the circumferential groove 10 closing assembly 33 is specified.

3 shows a second embodiment of the invention, in which the final assembly of three, in the space 28 ^{einsetzable ¬} parts 130, 131, 132 consists. The two lateral, in cross-section C-shaped side parts 130, 131 are inserted one after the other in the circumferential groove 10 and axially displaced so that their respective inner arms 52 are hooked to the projections 20 and 22 by each arm 52 respectively in one of the undercuts 24, 26 engages. Subsequently, the distance between these two side parts 130,

131 remaining space by the insertion of an intermediate part

132 filled, which secures the two side parts 130, 131 against axial displacement and prevents the release of the entanglement. The intermediate part 132 has a width B extending in the axial direction, which corresponds at least to the dimension a with which the projection 20 or 22 projects into the circumferential groove 10 in the axial direction.

The parts 130 and 132 lie in a contact plane 148 and the parts 131 and 132 in a contact plane 149 to each other. A bore 162 extends obliquely through the Kontaktebe ^¬ nen 148 and 149. To the parts 130, 131 and 132 to connect to each other non-positively with a pin-like Sicherungsele ^¬ element 136 is provided, which can be inserted into the bore 162. The bore 162 extends along an axis

140, which obliquely penetrates the contact surfaces 148, 149 and the three parts 130, 132, 131. Inside the bore 162, an internal thread 161 is provided, in which formed as a locking screw 164 fuse element 136 can be screwed. Thereby, the three parts, 130, 131, 132, which each have a threaded portion, releasably connected to each other, whereby the intermediate piece 132 and the final assembly 133 are secured as a whole against Herauslö ^¬ sen from the circumferential groove. It is even possible that only the intermediate part 132 has the internal thread 161 and the locking screw 164 is supported on the groove bottom of the circumferential groove 10 in order to secure the end assembly 133 as a whole. In addition, instead of a support on the groove bottom of the circumferential groove and a screw head provided with a locking screw 164 the side parts 130, 132 and this force-locking with each other.

Likewise, the parts 130, 131 132 of the final construction ^¬ group 133 can be hooked together with a dovetail guide according to the first embodiment.

As an alternative to the embodiment shown in FIG. 3, the three parts 130, 132, 131 could also be secured by two securing elements axially offset from one another. For this case, the securing element 136 would only the side member 131 with the intermediate part 132 frictionally ver ^¬ bind and another, not shown, also obliquely extending securing element only the two parts 130 and 132. Further, the second embodiment, a dovetail guide the parts 130, 132, and 131, 132 interconnect.

A third embodiment of the invention is shown in FIG 4 in a cross-sectional view and FIG 5 in a plan view. The successive insertable into the circumferential groove 10 side parts 230, 231 are each hooked with one of the projections 20 and 22 respectively. The two side parts 230, 231 are formed in cross-section substantially C-shaped and each have an outer arm 250 which partially closes the gap 28 to the outside partially, and an inner arm 252 which hooks with the projections 20, 22 is. The inner arms 250 are connected to the outer arms 252 by a web 254, respectively.

Between the two side parts 230, 231, an intermediate part 232 is provided, which secures the two side parts 230, 231 against axial displacement and thus against release of the hooking. The intermediate part 232 has an in Axialrich ^¬ tung on extending width B which at least corresponds to the dimension a, with which each projection 20 and 22 into the environment circumferential groove extends in the axial direction 10th

If this condition is not met, the second as to be inserted into the groove side part 130 and 131 are not ^¬ sets.

5 shows the top view of the third embodiment of the invention according to FIG 4. The intermediate part 232 is located in a contact surface 248 on the front side part 230 and is hooked via a first dovetail guide 246 with this. For this purpose, a dovetail-shaped projection and the front side part 230, the corresponding corresponding receptacle is formed on the intermediate part 232. In the same way, the rear side part 231 is hooked to the intermediate part 232, wherein these lie in a contact surface 249 against each other. In the second dovetail guide 247 and - interlocking of dovetail-shaped extension on the rear side ^¬ ren part 231 and its correspondingly shaped recess provided on the intermediate part 232nd In this case, the second dovetail guide 247 viewed in the circumferential direction can be made narrower than the first dovetail guide 246 to allow axial insertion of the narrower dovetailed extension in the larger recess during assembly of the second side member 231 or 230 and maximizing this to achieve the centrifugally stressed cross sections of the webs 254.

In the contact surfaces 248, 249, in each case in a manner analogous to the first embodiment according to FIG. 1 and FIG. ges securing element 236 is provided, which is designed as a securing screw ^¬ 264. To accommodate the Sicherungsele ^¬ elements 236 249 at least one bore 262 is provided in each contact plane 248. Each bore 262 is provided with an internal thread 263, which are each arranged in half in two parts 230, 231 and 231, 232. In each case, the pin-like securing elements 236 designed as securing screws 264 can be ^screwed into these internal threads 263 for frictionally and / or positively locking the parts 230, 231, 232 of the end assembly 233. Although each Innenge ^¬ winch 263 each half in two parts 230, 232 and 231, 232 is arranged, a reliable and against loosening ge ^¬ secured screw is possible because the two each internal thread 263 forming parts 230, 232 and 231, 232 means the respective dovetail guide 246, 247 are not axially displaced apart.

Figure 6 shows the top view of a variant of the third Substituted ^¬ staltung. In this case, the dovetail guide 247 between the parts 232 and 231, based on FIG 5, vice versa ^¬ forms. Both dovetail-shaped projections are arranged on the rule part 232 Zvi ^¬ and each side portion 230, 231 has in the corresponding contact surfaces 248, 249 a recess for receiving the respective projection on.

If in the unusual case, the blades 12 of the blade ring wander, so that a gap between the Schlussbau ^¬ group 33, 133, 233 and an immediate adjacent blade 12a and 12b occurs, could possibly be the final assembly as a whole from the circumferential groove 10th loosen by turning. This can be prevented by the webs 54, 254 of each side part 30, 32, 130, 131, 230, 231 on the ^{Seitenwän ¬} the 58 of the projections 20, 22 abut flange-like, as FIG 4 shows by way of example.

Instead of a locking screw 64, 164, 264 could also be a pin-like bolt in the bore 62, 162, 262 are used, which secured by a press fit against loosening is. To remove the final assembly, this would have to be ^{drilled out} uniquely.

Could continue to a provided with a screw head the locking screw 64, 164, are screwed into each circuit board 33 264, wherein the in one or more of the parts 30, 32, 130, 131, 132, 230, 231, 232 recessed Schrau ^¬ benkopf biased to this frictionally applied.

Overall, with the end assembly, a device for closing the remaining gap between the first and the last, inserted in a circumferential groove blades of a blade ring can be specified, which can be easily mon ^¬ animals and disassemble. Since the assembly of the final assembly does not require any plastic deformation of the components, but instead proposes the frictional connection of the parts, they can be loosened and disassembled by working in reverse. All components of the circuit ^¬ assembly can be reused. In addition, the simple design allows a relatively cheap Fertigungsauf ^¬ wall.

Claims

claims 1. closing assembly (33, 133, 233) for closing the remaining gap (28) between the first and the last inserted in a circumferential groove (10) of a turbomachine blade (12a, 12b) of a blade ring, consisting of at least two side parts ( 30, 32, 130, 131, 132, 230, 231, 232), of which at least one with an undercut (24, 26) forming projection (20, 22) of the circumferential groove (10) can be hooked and at least one pin-like securing element (36, 136, 236) securing the parts (30, 32, 130, 131, 132, 230, 231, 232) from detachment from the circumferential groove (10) and releasably connecting them, characterized in that the two side parts (30, 32 ) over a Dovetail guide (46) or each side part (130, 131, 230, 231) with an interposed Intermediate part (132, 232) via one each Dovetail guide (146, 147, 246, 247) is interconnected. 2. closing assembly (33, 133, 233) according to claim 1, wherein the dovetail guide (46, 146, 147, 246, 247) in such a manner on the parts (30, 32, 130, 131, 132, 230, 231, 232) is arranged so that the elements of the dovetail guide (46, 146, 147, 246, 247) engage in the radial insertion of the last part (32, 132, 232). 3. closing assembly (133, 233) according to claim 1 or 2, which comprises the intermediate part (132, 232) and a further pin-like securing element (136, 236), wherein each side part (130, 131, 230, 231) with the Zwi ^¬ Schenteil (132, 232) by means of one of the two pin-like securing elements (136, 236) is secured. 4. closing assembly (33, 133, 233) according to claim 1, 2 or 3, wherein the two adjoining side parts (30, 32) or each side part (130, 131, 230, 231) on the intermediate ^¬ schenteil (132, 232) lie in a plane of contact (48) to each other or in a contact plane (148, 149, 248, 249) to ^¬ located each other, wherein the fuse element (36) or the Sicherungsele ^¬ elements (136, 236) longitudinally within the Contact level (48, 148, 149, 248, 249) extend or extend. 5. closing assembly (33, 133, 233) according to any one of claims 1, 2 or 3, wherein the two adjacent side parts (30, 32) or each side part (130, 131, 230, 231) on the Zwi ^¬ schenteil ( 132, 232) lie in a plane of contact (48) to each other or in a contact plane (148, 149, 248, 249) to ^¬ located each other, wherein the fuse element (36) and the fuse elements (136, 236) extends transversely extend through the contact plane (48, 148, 149, 248, 249). 6. closing assembly (33, 133, 233) according to one of the preceding claims, wherein the securing element (36, 136, 236) the parts (30, 32, 130, 131, 132, 230, 231, 232) frictionally with ^¬ connects each other. 7. closing assembly (33, 133, 233) according to one of the preceding ^¬ the claims, wherein the securing element (36, 136, 236) is a hedging screw ^¬ (64, 164, 264). End assembly (33, 133, 233) according to claim 7, wherein the locking screw (64, 164, 264) is designed as a grub screw. 9. closing assembly (33, 133, 233) according to one of the preceding ^¬ the claims, in which each part (30, 32, 130, 131, 230, 231) on a side wall (58) can be applied, the one of the Hinter- is formed (24, 26) forming projection (20, 22) of the circumferential groove (10). 10. closing assembly (33, 133, 233) according to any one of the preceding claims, wherein the securing element (36, 136, 236) is secured against loosening. 11. turbomachine with a rotor having at least one undercuts (24, 26) having circumferential groove (10) with blades (12a, 12b) mounted therein, wherein the remaining space (28) between the first and the last in the circumferential groove (10) inserted rotor blade (12a, 12b) with a closing assembly (33, 133, 233) is completely closed according to one of the preceding claims. 12. Turbomachine according to claim 11, designed as a turbine of a gas turbine, as a compressor or as a steam turbine.