EP2787175A1 - Securing system and method for securing a fixing region of at least one rotor blade or a rotor blade segment in a mounting area of a rotor base body - Google Patents

Abstract

The invention relates to a securing system (16) for securing a fastening region (22) of at least one rotor blade (14) or a rotor blade segment in a mounting region (24) of a rotor base body (12), wherein the securing system (16) comprises at least a first retaining part element (26a) and a second holding part element (26b), each comprising a holding area (28a, 28b) and a connecting area (30a, 30b), wherein the connecting areas (30a, 30b) of the holding part elements (26a, 26b) for producing a clip connection in the assembly area (26) 24) and in the mounting area (24) are latched together, and wherein the holding portions (28a, 28b) of the holding part elements (26a, 26b) are formed, the mounting portion (22) of the at least one rotor blade (14) or the rotor blade segment in the locked state the connecting portions (30a, 30b) in the mounting area (24) set. The invention further relates to a method for securing a fastening region (22) of at least one rotor blade (14) or a rotor blade segment in a mounting region (24) of a rotor base body (12) and a rotor (10) with a securing system (16).

Description

The work leading to this invention was supported under the grant agreement under the Seventh Framework Program of the European Union ( FP7 / 2007-2013 ).

description

The invention relates to a securing system and a method for securing a fastening region of at least one rotor blade or a rotor blade segment in a mounting region of a rotor base body. The invention further relates to a rotor with at least one such security system.

Such a security system is for example already out of the US 2009/0060746 A1 refer to. For fixing rotor blades on a rotor base body first formed as a so-called Retainerbleche security systems are used in individual mounting areas of the rotor body. Subsequently, the rotor body is bladed by the mounting portions of the rotor blades or rotor blade segments are inserted into the corresponding mounting areas. To secure the rotor blades or rotor blade segments, end portions of the individual security systems are bent over to form a kind of clip around the attachment area.

A disadvantage of the known security systems is the fact that in cases where these Retainerbleche be damaged when bent, the entire rotor body has to be de-scooped to replace the defective security system. This leads to significantly increased monthly costs and times.

Object of the present invention is to provide a security system of the type mentioned, which allows improved assembly and disassembly. Further objects of the invention are a corresponding method for securing a fastening region of at least one rotor blade or a rotor blade segment in a mounting region of a To provide rotor body and a rotor with a corresponding security system.

The objects are achieved by a security system with the features of claim 1, by a method having the features of claim 11 and by a rotor having the features of claim 12. Advantageous embodiments with expedient developments of the invention are specified in the respective subclaims, wherein advantageous embodiments of the security system are to be regarded as advantageous embodiments of the method and the rotor and vice versa.

A first aspect of the invention relates to a securing system for securing a fastening region of at least one rotor blade or rotor blade segment in a mounting region of a rotor base body. For improved assembly and disassembly of the security system, it is provided according to the invention that the security system comprises at least a first holding part element and a second holding part element, each comprising a holding portion and a connecting portion. The connection areas of the holding part elements can be inserted into the assembly area for producing a clip connection and can be locked together in the assembly area. The holding regions of the holding sub-elements are designed such that they define the attachment region of the at least one rotor blade or the rotor blade segment in the latched state of the connecting regions in the assembly region. In other words, a two-part securing system according to the invention is provided, the two holding sub-elements are clipped together to secure the rotor blade or the rotor blade segment on the rotor body in the respective mounting area, the holding portions of the holding part elements are formed in the assembled state of the holding part elements such that without further steps such as bending or the like effect a positional fixation of the relevant rotor blade or the relevant rotor blade segment. As a result, a particularly simple, fast and cost-effective installation of the securing system and a correspondingly simple, fast and cost-effective position securing of the rotor blade or the rotor blade segment are made possible. To remove or replace the security system, it is also sufficient to release the clip connection between the holding part elements. The again separated holding sub-elements can then be easily removed from the mounting area and optionally replaced by new holding sub-elements. A defibration of the entire rotor body is not required in contrast to the prior art, whereby considerable time and cost advantages can be achieved. The security system is basically independent from the required mounting direction and can be mounted, for example, in the axial or radial direction, from the front or from the back of the rotor main body. After making the clip connection, the security system continues to ensure a defined flow of force.

In an advantageous embodiment of the invention, it is provided that the connecting region of the first holding part element comprises a shaft with at least one protruding latching lug, which can be clipped into a clip receptacle of the connecting region of the second holding part element for producing the clip connection. As a result, a simple and flexible way to produce a clip connection is created. By varying the shaft length, a simple adaptability of the security system to different rotor types is also given. It can be provided in principle that the first holding part element comprises a shaft with two or more locking lugs. This allows a particularly simple adjustment of Einclips- and Ausclipskräfte that can be adjusted substantially independently. Thus, for example, a firm and secure connection of the holding part elements can be ensured with great Ausclipskraft.

Further advantages arise when the clip receiving the second holding part element comprises at least one latching tongue. As a result, the insertion kinematics required for clipping or latching of the retaining sub-elements and the associated clipping forces can be set in a particularly simple and precise manner. In principle, it can be provided that each latching lug of the first holding part element is associated with a latching tongue of the second holding part element.

In a further advantageous embodiment of the invention it is provided that the at least one latching tongue for producing the clip connection is elastically deformable between a rest position and a deflected position and / or forms an insertion bevel for clipping the at least one latching lug of the first holding part element. By the latching tongue is elastically deformable between a rest position and a deflected position, the latching tongue can be elastically deformed during insertion of the locking lug out of the rest position until the latch has reached its desired final assembly position and the clip connection is made. Preferably, the latching tongue returns to its rest position after or during the manufacture of the clip connection. By the at least one latching tongue an insertion bevel for clipping forms the at least one latching lug of the first holding part element, the Einführkinematik and the Einclipskräfte can be adjusted very easily and precisely, so that a correspondingly simple and quick installation is possible.

A simplified assembly of a further advantageous embodiment of the invention is achieved in that the at least one locking lug on its side facing away from the holding region has a rounded and / or beveled Einführkontur. A particularly precise adjustment of the necessary for disassembly Ausclipskraft is alternatively or additionally achieved in that the at least one locking lug on its side facing the holding portion comprises a locking edge which includes a predetermined angle with a longitudinal axis of the shaft. For example, it can be provided that the latching edge of the latching lug runs at a right angle or at an acute angle to the longitudinal axis of the shaft in order to ensure particularly high Ausclipskräfte. It can further be provided that the Ausclipskräfte be set so high that the clip connection can not be solved without destruction. Conversely, by setting an obtuse angle lower Ausclipskräfte be achieved. A mechanically particularly stable and non-destructive releasable clip connection is achieved in that the clip receptacle engages in the locked state in an undercut of the detent.

Further advantages result if the connecting region of the second holding part element comprises a receptacle in which the at least one latching lug of the first holding part element is arranged in the latched state of the holding part elements. This represents a structurally simple way to define the final assembly position of the holding part elements.

A particularly precise adaptability to different geometries of the assembly area is achieved in a further embodiment of the invention in that the longitudinal axis of the shaft and / or a main extension axis of the clip receiving a predetermined angle with a main extension axis of the associated holding portion includes. As a result, the securing system can be adapted in a particularly simple manner to mounting regions extending obliquely or non-parallel to a rotational axis of the rotor main body.

In a further advantageous embodiment of the invention, the connecting regions of the first holding part element and the second holding part element comprise each other corresponding Stops, by means of which a relative movement between the holding part elements can be limited. This is a structurally simple and cost-effective way to limit the relative mobility of the two holding part elements and to define a final assembly position.

In a further advantageous embodiment of the invention, it is provided that the connection areas of the first holding part element and the second holding part element are designed such that they can be clipped only destructive after locking. As a result, a particularly reliable backup of the rotor blade or the rotor blade segment is achieved without disassembly is basically impossible.

A mechanically particularly stable securing of the rotor blade or the rotor blade segment and a particularly advantageous force flow are achieved in a further embodiment of the invention in that the holding portion and the connecting portion of the first holding member and / or the second holding member are formed in cross-section substantially L-shaped.

A second aspect of the invention relates to a method for securing a fastening region of at least one rotor blade or a rotor blade segment in a mounting region of a rotor main body. According to the invention, provision is made for a securing system according to one of the preceding embodiments to be used, the connecting regions of the retaining subelements of the securing system being introduced from opposite sides into the mounting region and latched to one another in the assembly region to produce a clip connection, such that the retaining regions of the retaining subelements enclose the attachment region the at least one rotor blade or the rotor blade segment set in the locked state of the connection areas in the mounting area. As a result, a particularly simple, fast and cost-effective installation of the securing system and a correspondingly simple, fast and cost-effective position securing of the rotor blade or the rotor blade segment are made possible. To remove or replace the securing system, it is sufficient to release the clip connection between the holding part elements. It can be basically provided that the two holding sub-elements can be nondestructively or only destructively clipped out again. The again separated holding sub-elements can then be easily removed from the mounting area and optionally replaced by new holding sub-elements. A defibration of the entire rotor body is not required in contrast to the prior art, whereby considerable time and cost advantages can be achieved. The security system can basically be used regardless of the required mounting direction. After making the clip connection, the security system also ensures a defined flow of force. The securing system is preferably introduced into the mounting area with respect to the axis of rotation of the rotor base body radially below the fastening area of the rotor blade or of the rotor blade segment. Further resulting features and their advantages can be found in the descriptions of the first aspect of the invention, wherein advantageous embodiments of the first aspect of the invention are to be regarded as advantageous embodiments of the second aspect of the invention and vice versa.

A third aspect of the invention relates to a rotor, in particular for a thermal gas turbine, having a rotor main body which comprises at least one mounting region in which a fastening region of at least one rotor blade or a rotor blade segment is fixed. According to the invention, it is provided that the rotor comprises at least one securing system according to one of the preceding exemplary embodiments, by means of which the fastening region of the at least one rotor blade or the rotor blade segment is fixed to the rotor base body. As a result, a particularly simple, fast and cost-effective installation of the securing system and a correspondingly simple, fast and cost-effective position securing of the rotor blade or the rotor blade segment are made possible. The rotor base body may be formed, for example, as a rotor disk or as a rotor ring. Further resulting features and their advantages can be found in the descriptions of the first and second aspects of the invention, advantageous embodiments of the first and second aspects of the invention being regarded as advantageous embodiments of the third aspect of the invention and vice versa.

Further advantages result from the fact that the mounting area is formed with respect to an axis of rotation of the rotor as an axial mounting opening in a radially outer edge region of the rotor base body. This allows not only a simple assembly and a mechanically particularly stable connection of the rotor blade (s) and the rotor blade segment on the rotor body.

Fig. 1

eine schematische seitliche Schnittansicht eines Rotors, an dessen Rotorgrundkörper eine Rotorschaufel mit Hilfe eines erfindungsgemäßen Sicherungssystems befestigt ist;

Fig. 2

eine teiltransparente Perspektivansicht des in Fig. 1 gezeigten Rotors;

Fig. 3

eine schematische Aufsicht eines ersten Halteteilelements des Sicherungssystems;

Fig. 4

eine schematische Aufsicht eines zweiten Halteteilelements des Sicherungssystems; und

Fig. 5

eine schematische Perspektivansicht des Sicherungssystems, wobei das erste und das zweite Halteteilelement miteinander verrastet sind.

Further features of the invention will become apparent from the claims, the embodiment and the drawings. The features mentioned above in the description and Characteristic combinations as well as the features and combinations of features mentioned below in the exemplary embodiment can be used not only in the respectively specified combination but also in other combinations without departing from the scope of the invention. Showing:

Fig. 1

a schematic sectional side view of a rotor, on whose rotor body a rotor blade by means of a securing system according to the invention is attached;

Fig. 2

a semi-transparent perspective view of the in Fig. 1 shown rotor;

Fig. 3

a schematic plan view of a first holding part element of the security system;

Fig. 4

a schematic plan view of a second holding part element of the security system; and

Fig. 5

a schematic perspective view of the securing system, wherein the first and the second holding part element are locked together.

Fig. 1 shows a schematic sectional side view of a rotor 10 for a thermal gas turbine, for example for an aircraft engine. Fig. 1 is described below in synopsis with Fig. 2 in which a schematic and partially transparent perspective view of the in Fig. 1 shown rotor 10 is shown. The rotor 10 has a disk-shaped rotor base body 12, to which a rotor blade 14 is fastened by means of a securing system 16 according to the invention. The rotor blade 14 has an airfoil 18, an underlying blade platform 20 and a radially arranged below the blade platform 20 and in the present case designed as a blade root mounting portion 22, which is inserted into a relative to a rotational axis of the rotor 10 axially extending mounting portion 24 of the rotor body 12 is. It can be seen that the securing system 16 is arranged radially below the attachment region 22 of the rotor blade 14 in the assembly region 24 and surrounds the attachment region 22 in the manner of a clip, so that the rotor blade 14 is fixed to the rotor body 12 both at the front and at the rear side.

The securing system 16 consists of a first holding part element 26a, which in Fig. 3 is shown in plan view, and a second holding part element 26 b, the in Fig. 4 is shown in supervision. Each holding part element 26a, 26b has in each case a holding region 28a or 28b and a connecting region 30a or 30b, the connecting regions 30a, 30b of the holding part elements 26a, 26b being introduced from the front and the other from behind into the assembly region 24 for producing a clip connection are latched together in the mounting area 24, so that the holding portions 28a, 28b of the holding part elements 26a, 26b, the mounting portion 22 of the rotor blade 14 (or a rotor blade segment) in the in Fig. 1 and Fig. 2 position secured in the mounting area 24. The holding regions 28a, 28b and the connecting regions 30a, 30b of the first and second holding partial elements 26a, 26b are substantially L-shaped in cross section, so that the holding regions 28a, 28b are at least approximately perpendicular to the connecting regions 30a, 30b.

As in Fig. 3 can be seen, the connecting portion 30a of the first holding part member 26a comprises a shaft 32 with two laterally projecting locking lugs 34a, 34b. To produce the clip connection, the connecting region 30a is clipped into a correspondingly formed clip receptacle 36 of the connecting region 30b of the second retaining part element 26b. Fig. 5 shows for further explanation a schematic perspective view of the securing system 16, wherein the first and the second holding part element 26a, 26b are locked together. How to get in Fig. 4 recognizes, the clip holder 36 of the second holding part element 26b comprises two locking tongues 38a, 38b, which act as Einführschrägen and when inserting the locking lugs 34a, 34b in the clip holder 36 from the in Fig. 4 shown rest position elastically deformed outwardly until the locking lugs 34a, 34b their in Fig. 5 reach recognizable Montageendposition in which they are arranged in a corresponding receptacle 40 of the connecting portion 30b. One recognizes in Fig. 3 in that the latching lugs 34a, 34b have rounded insertion contours 35a, 35b on their sides facing away from the holding region 28a or their sides facing the clip receptacle 36, thereby facilitating insertion into the clip receptacle 36.

The receptacle 40, together with the stops 42a, 42b and the corresponding stops 42c, 42d of the second holding part element 26b, limits the movement of the first holding part element 26a into the clip receptacle 36 of the second holding part element 26b. In the in Fig. 5 shown position of the first holding part element 26a, the locking lugs 34a, 34b spring back into their in Fig. 4 shown rest position and form with their inner end portions stops 42e, 42f, the in cooperation with locking edges 44a, 44b of the latching noses 34a, 34b make it impossible for the first holding part element 26a to move out of the clip receptacle 36. The connecting regions 30a, 30b of the first and second holding part elements 26a, 26b are in the present case designed such that they can not be nondestructively nicked after locking. For this purpose, locking edges 44a, 44b close approximately a right angle with a longitudinal axis of the shaft 32 one. In cooperation with the stops 42e, 42f of the latching tongues 38a, 38b, it is therefore ensured that the required extracting force is so great that destruction of at least one of the holding part elements 26a, 26b occurs before reaching the extracting force.

How to get in FIG. 3 and FIG. 4 Furthermore, the longitudinal or main extension axes of the shaft 32 or of the clip receiver 36 are not perpendicular to the main extension axes of the respective holding regions 28a, 28b, but are slightly angled in order to better correspond to a geometry of the mounting regions 24.

The parameter values given in the documents for the definition of process and measurement conditions for the characterization of specific properties of the subject invention are also within the scope of deviations - for example, due to measurement errors, system errors, Einwaagefehlern, DIN tolerances and the like - as included in the scope of the invention ,

Claims (13)

Securing system (16) for securing a mounting region (22) of at least one rotor blade (14) or a rotor blade segment in a mounting region (24) of a rotor base body (12), characterized in that the securing system (16) at least a first holding part element (26 a) and a second holding part element (26b), each comprising a holding portion (28a, 28b) and a connecting portion (30a, 30b), wherein the connecting portions (30a, 30b) of the holding part elements (26a, 26b) for producing a clip connection in the mounting area (24 ) and in the mounting region (24) are latched together, and wherein the holding portions (28a, 28b) of the holding part elements (26a, 26b) are formed, the mounting portion (22) of the at least one rotor blade (14) or the rotor blade segment in the locked state of Establish connection areas (30a, 30b) in the mounting area (24). Securing system (16) according to claim 1, characterized in that the connecting region (30a) of the first holding partial element (26a) comprises a shaft (32) with at least one protruding latching lug (34a, 34b) which is adapted for producing the clip connection in a clip receiver (36 ) of the connecting portion (30b) of the second holding part element (26b) can be clipped. Securing system (16) according to claim 2, characterized in that the clip receptacle (36) of the second holding part element (26b) comprises at least one latching tongue (38a, 38b). Securing system (16) according to claim 3, characterized in that the at least one latching tongue (38a, 38b) for producing the clip connection is elastically deformable between a rest position and a deflected position and / or an insertion bevel for clipping the at least one latching lug (34a, 34b ) of the first holding part element (26a) forms. Securing system (16) according to one of claims 2 to 4, characterized in that the at least one latching lug (34a, 34b) facing away from the holding region (28a) Side has a rounded and / or beveled Einführkontur (35a, 35b) and / or that the at least one latching lug (34a, 34b) on its the holding portion (28a) side facing a latching edge (44a, 44b) having a predetermined angle with a longitudinal axis of the shaft (32) and / or that the clip receptacle (36) engages in the latched state in an undercut of the latching lug (34a, 34b). Securing system (16) according to one of claims 2 to 5, characterized in that the connecting region (30a, 30b) of the second holding part element (26b) comprises a receptacle (40), in which the at least one latching lug (34a, 34b) of the first holding part element (26 a) in the latched state of the holding part elements (26 a, 26 b) is arranged. A security system (16) according to any one of claims 2 to 6, characterized in that the longitudinal axis of the shaft (32) and / or a main extension axis of the clip receiver (36) includes a predetermined angle with a main extension axis of the associated retaining portion (28a, 28b). Securing system (16) according to one of claims 1 to 7, characterized in that the connecting portions (30a, 30b) of the first holding part element (26a) and the second holding part element (26b) comprise mutually corresponding stops (42a-f), by means of which a relative movement between the holding part elements (26a, 26b) can be limited. Securing system (16) according to one of claims 1 to 8, characterized in that the connecting regions (30a, 30b) of the first holding part element (26a) and the second holding part element (26b) are formed such that they can be clipped only destructive after locking , Securing system (16) according to one of claims 1 to 9, characterized in that the holding region (28a, 28b) and the connecting region (30a, 30b) of the first holding part element (26a) and / or the second holding part element (26b) in cross-section substantially L-shaped. Method for securing a fastening region (22) of at least one rotor blade (14) or a rotor blade segment in a mounting region (24) of a rotor main body (12), characterized in that a securing system (16) according to one of claims 1 to 10 is used, wherein the Connecting regions (30a, 30b) of the holding subelements (26a, 26b) of the security system (16) are introduced from opposite sides into the assembly region (24) and latched together in the assembly region (24) to produce a clip connection, such that the holding regions (28a, 28b) of the holding partial elements (26a, 26b) fix the fastening region (22) of the at least one rotor blade (14) or the rotor blade segment in the latched state of the connecting regions (30a, 30b) in the assembly region (24). Rotor (10), in particular for a thermal gas turbine, having a rotor main body (12) which comprises at least one mounting region (24) in which a fastening region (22) of at least one rotor blade (16) or a rotor blade segment is fixed, characterized in that the rotor (10) comprises at least one securing system (16) according to one of claims 1 to 10, by means of which the fastening region (22) of the at least one rotor blade (14) or the rotor blade segment is fixed to the rotor base body (12). Rotor (10) according to claim 12, characterized in that the mounting region (24) with respect to a rotational axis of the rotor (10) as an axial mounting opening (24) in a radially outer edge region of the rotor base body (12) is formed.

Images