SEALING STRIP ELEMENT AND SEALING ARRANGEMENT COMPRISING SAID SEALING STRIP ELEMENT

Abstract

A sealing strip element for sealing a gap between two components of a gas-turbine installation, and extends along a longitudinal direction and has a contoured cross section in a ribbed central region. The sealing strip element extends along the longitudinal direction, wherein at least one of the first main surface and the second main surface includes a riffle structure, wherein the riffle structure has multiple teeth extending substantially from the first strip end to the second strip end along a substantially straight line while establishing chutes between them, wherein at least one dam is provided at at least one strip end of the sealing strip element.

Claims

1. A sealing strip element for sealing a gap between two components, wherein the sealing strip element being is plate-like and comprises a strip thickness between a first main surface and a second main surface, which are opposingly arranged to one another, wherein the sealing strip element extends along a first, longitudinal direction between a first strip end and a second strip end defining a strip length therebetween and along a second direction defining a strip width, wherein the first direction is perpendicular to the second direction, wherein at least one of the first main surface and the second main surface comprises a riffle structure, wherein the riffle structure comprises teeth extending substantially from the first strip end to the second strip end along a substantially straight line while establishing chutes between the teeth, wherein at least one dam is provided at at least of i) the first strip end, ii) the second strip end, and iii) between the first and second strip ends, wherein the dam closes the respective chute at the respective strip end or the dam divides the respective chute.

2. The sealing strip element according to claim 1, comprising: multiple dams at the respective strip end for closing all chutes at the respective strip end of the sealing strip element.

3. The sealing strip element according to claim 1, wherein a height of the teeth of the riffle structure and a height of the dams are determined with regard to a bottom level of the chutes, and wherein dams have substantially the same height as the teeth.

4. The sealing strip element according to claim 1, wherein both ends of the sealing strip element comprise at least one dam.

5. The sealing strip element according to claim 1, wherein, between the first strip end and the second strip end, further dams are provided for dividing full length chutes, each of which are arranged between two directly adjacent teeth, into a series of chutes arranged along the longitudinal direction.

6. A sealing arrangement comprising: a sealing strip element according to claim 1, and two components which are spaced apart opposite one another by a gap, wherein mutually opposite walls of the components are each provided with a component groove in which the sealing strip element is arranged in order to seal the gap.

7. The sealing arrangement according to claim 6, wherein each component comprises at least two grooves intersecting each other in T-style, and wherein, in each of the two pairs of mutually opposite grooves, a sealing strip element is engaged such, that a first or second strip end of one of the two sealing strip elements is located in an intersection area next to further dams of the other of the two sealing strip elements.

8. The sealing arrangement according to claim 7, wherein both sealing strip elements comprise dams, which are located next to each other in the intersection area.

9. The sealing strip element according to claim 4, wherein both ends of the sealing strip element comprise multiple dams.

10. The sealing arrangement of claim 8, wherein both sealing strip elements comprise dams which are in contact with one another.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The present invention will be described with reference to drawings in which:

[0023] FIG. 1 shows part of a longitudinal section through a gas-turbine installation,

[0024] FIG. 2 shows the cross section through a sealing arrangement of a gas-turbine installation having a sealing strip element,

[0025] FIG. 3. shows in a plan view the sealing strip element according to a preferred exemplary embodiment and

[0026] FIG. 4 shows in a perspective view the sealing arrangement in accordance with FIG. 3.

DETAILED DESCRIPTION OF INVENTION

[0027] FIG. 1 illustrates a gas-turbine installation directed along a main axis 14. This gas-turbine installation has stator vanes 12 and rotor blades 15 alternating in the axial direction in a housing 17. The stator vanes 12 are directed along a radial axis 18 perpendicular to the main axis 14 and are arranged along the circumference of the gas-turbine installation to form a circle. The stator vanes 12 are connected to the housing 17 of the gas-turbine installation via a respective stator vane platform 16. Along the circumference, adjacent platforms 16 are spaced apart from one another by a respective gap 5 (see FIG. 2), as a result of which they can expand largely freely as a result of thermal action.

[0028] The stator vane platforms 16 separate a hot-gas region 11, which is formed around the main axis 14 of the gas-turbine installation, from a cooling air area 8, which is formed between the stator vane platforms 16 and the turbine housing 17. The rotor blades 15 extend along a respective main axis 19, which is likewise essentially orthogonal to the main axis 14 of the gas-turbine installation. The rotor blades 15 are located entirely within the hot-gas region 11. This hot-gas region 11 is separated from the cooling air area 8 along the circumference of the gas-turbine installation by a plurality of wall components 13, also known as heat shields or ring segments. The wall components 13 here are each adjacent to the moving blades 15. The wall components 13 are connected to the turbine housing 17. For the sake of clarity, in each case just one stator vane 12, one rotor blade 15 and one wall component 13 have been illustrated. As seen in the axial direction, a respective wall component 13 is spaced apart by a gap 5 from a respective stator vane 12, in particular, the stator vane platform 16. This gap 5 is sealed by a sealing strip element 1 as a result of which largely a flow of cooling gas out of the cooling air area 8 into the hot-gas region 11 is prevented. The stator vane 12 here constitutes a first component 2a and the wall part 13 constitutes a second component 2b. As seen in the axial direction, the cooling air area 8 is sealed from the hot-gas region 11 by stator vane platforms 16 and wall components 13 and, as seen in the circumferential direction, sealing takes place in each case between adjacent stator vanes 12 and between correspondingly adjacent wall components 13.

[0029] FIG. 2 shows a section, taken along the circumference of the gas-turbine installation, through two adjacent components 2a, 2b. The two components 2a, 2b are part of a scaling arrangement 2c and are spaced apart from one another by a gap 5. The components 2a, 2b may each be two adjacent stator vanes 12, in particular stator vane platforms 16 and/or two adjacent wall components 13. As seen in the circumferential direction in each case, a component groove 3a, 3b is provided in the components 2a, 2b, respectively. A sealing strip element 1 engages in both component grooves 3a, 3b to seal the gap 5. The sealing strip element 1 is directed along a first, longitudinal direction 21 and has, in the cross section illustrated, in a direction perpendicular to the longitudinal line 21, a first lateral end 4a, a second lateral end 4b and a central region 10 located therebetween. The central region 10 has a plurality of ribbing chutes 7 directed toward the cooling air area 8, wherein a respective sealing tooth 20 is formed between adjacent chutes 7, as a result of which the central region 10 has the riffle structure on one of its two main surfaces 23, 24 (FIG. 4). The sealing teeth 20 are arranged on a tooth-carrier portion 10 of the sealing strip element 1. Each chute 7 and each sealing tooth 20 extends parallel to the longitudinal line 21 and perpendicularly to a possible main leakage flow along the gap 5.

[0030] The component grooves 3a, 3b each have groove side walls each located opposite, and parallel, to one another. Since usually the pressure of the cooling gas in the cooling area 8 is higher than the pressure of the hot gas in the hot-gas-channeling region 11, the sealing strip element 1 has its smooth surface resting on the side walls of the component grooves 3a, 3b, and therefore the sealing teeth 20 are rather relieved of mechanical loading.

[0031] FIG. 3. shows in a plan view the sealing strip element 1 according to a preferred exemplary embodiment. It comprises multiple teeth 20 extending in a longitudinal direction 21 from a first strip end 6a to a second strip end 6b. The sealing strip element 1 has a strip length which is determined between the two strip ends 6a, 6b, whereas a strip width w (FIG. 4) is determined in perpendicular direction 22, between the first and second lateral ends 4a, 4b. Between each to directly adjacent tooth 20 chutes 7 are established. At each first and second strip end 6a, 6b dams 30 are provided for closing the respective chutes 7. According to this exemplary embodiment, the displayed sealing strip element 1 comprises also the further dams 32, which are optional, but when arranged, divides or interrupts the otherwise single chute 7 between two dedicated teeth 20 into a series of chutes 7 between them.

[0032] The sealing strip element 1 according to the preferred exemplary embodiment is in plan view of rectangular shape. Other shapes, of course, like rhomboidal or even trapezoidal shapes, etc., are also possible. Likewise, the shape of the teeth in cross section canas shown in FIG. 2, triangular, or alternatively rectangular.

[0033] Finally, FIG. 4 shows in a perspective view the sealing arrangement 2c in accordance with FIG. 3 in a situation, in which two component grooves 3a of the same component 2a merges in T-style in an intersection area 25 into one another. One sealing strip element 1a, 1b is arranged in each of the two component grooves 3a. For the sake of better understanding the mutually arranged second component 2b is not displayed in FIG. 4.

[0034] The height of the teeth 20 of the riffle structure and the height of the dams 30, 32 are determined with regard to the bottom level of the chutes 7. The dams 30, 32 have in this exemplary embodiment the same height as the teeth 20 for maintaining a constant and evenly distributed thickness t of the sealing strip element, provided, that the reduced thickness in the areas of the chutes 7 is ignored. Nevertheless, in single configurations it might be beneficial to have dams 30, 32, whose heights are different to the height of the teeth 20.

[0035] To reduce the chute leakage flows both sealing strip elements 1a, 1b are equipped with dams 30, 32, either at its strip end 6a and/or at an intermediate position between its strip ends 6a, 6b. In detail, in the area of the intersection 25, where the one strip element 1a is able to get in contact with the other strip element 1b, the application of dams 30, 32 enables the establishment of a contact over the complete width of the sealing strip elements 1a, 1b. This reduces the size of the unblocked cross-section between the two sealing strip elements 1a, 1b significantly. The leakage flow from a high-pressure area to a low-pressure area is thereby reduced or at best, avoided. A reduction of leakage flow can still be achieved when the sealing element 1a is of conventional style, as long the sealing element 1b comprises further dams 32. In this case the sealing contact area is slightly reduced as only the thickness of the tooth-carrier-portion 10, which still extends over the complete width of the sealing strip element, contributes to the sealing.

[0036] Overall, the invention relates to a sealing strip element 1 which is designed for sealing a gap 5 between two components 2a, 2b, in particular a sealing arrangement 2c of a gas-turbine installation, and extends along a longitudinal direction 21 and has a contoured cross section in a ribbed central region 10. As seen in cross section, the sealing strip element 1 extends along the longitudinal direction 21, wherein at least one of the first main surface 23 and the second main surface 24 comprises a riffle structure, wherein the riffle structure comprises multiple teeth 20 extending substantially from the first strip end 6a to the second strip end 6b along a substantially straight line while establishing chutes 7 between them, wherein at least one dam 30, 32 is provided at at least one strip end 6a, 6b of the sealing strip element 1, the dam 30 closes the respective chute at the respective strip end 6a, 6b of the sealing strip element 1 for reducing chute leakage flow. Further, the invention relates to a sealing arrangement 1 of two neighbored components 2a, 2b comprising at least one of the sealing strip elements 1 equipped with dams.