IMPACT COOLING SLEEVE AND METHOD FOR MANUFACTURING AN IMPACT COOLING SLEEVE

Description

TECHNICAL FIELD

[0001] The present invention is directed to an impingement sleeve, to a component comprising such an impingement sleeve, and to a method of forming the impingement sleeve.BACKGROUND ART

[0002] Turbine systems are continuously being modified to increase efficiency and decrease cost. One method for increasing the efficiency of a turbine system includes increasing the operating temperature of the turbine system. To increase the temperature, the turbine system must include components which can withstand such temperatures during continued use.

[0003] In addition to modifying component materials and coatings, one common method of increasing the temperature capability of a turbine component includes supplying a flow of cooling fluid. Often, to supply the cooling fluid flow, relatively cooler air is diverted from the compressor and provided to the component(s) to be cooled. In certain components, an impingement sleeve is positioned within the component, the impingement sleeve directing the cooler air towards an inner surface of the component. Generally, impingement sleeves are open single plenum devices including a plurality of cooling holes formed therein. The cooler air fills the plenum of the impingement sleeve and then passes through the plurality of cooling holes. Typically, in order to control cooling flow from the impingement sleeve, the individual cooling hole count / size is changed to increase / decrease flows to certain zones. However, reducing cooling hole size can result in plugging while decreasing cooling hole count may reduce the effective coverage of the impingement cooling.

[0004] US 5207556 A, US 2014 / 093379 A1, EP 0 182 588 A1, US 2009 / 324385 A1, EP 2 708 296 A2, WO 2015 / 042009 A1, EP 0 887 515 A1, US 7 246 993 B2, US 5 772 398 A, US 4 312 624 A, US 2011 / 123351 A1, and US 5 464 322 A disclose arrangements of an impingement sleeve for a turbine component, having an internal baffle.

[0005] An article and method of forming an impingement sleeve that show one or more improvements in comparison to the prior art would be desirable in the art.

[0006] The invention is set out in the appended set of claims.

[0007] Various features and advantages of the present invention will be apparent from the following more detailed description, taken in conjunction with the accompanying drawings which illustrate, by way of example, the principles of the invention. In the drawings: FIG. 1 is a perspective view of a cooling article. FIG. 2 is a section view of a cooling article taken in direction 2-2 as shown in FIG. 1. FIG. 3 is a section view of a cooling article taken in direction 3-3 as shown in FIG. 1, according to an embodiment of the invention. FIG. 4 is a section view of a cooling article positioned within a component. FIG. 5 is a process view of a method of forming a cooling article, according to an embodiment of the invention. FIG. 6 is a schematic view of a method of forming a cooling article, according to an embodiment of the invention.

[0008] Wherever possible, the same reference numbers will be used throughout the drawings to represent the same parts.

[0009] Examples of cooling articles other than impingement sleeves, and examples of cooling articles having a single baffle , or where none of the baffles comprises a porous structure including at least one opening extending there through are not in accordance with the invention and are present for illustration purposes only.

[0010] Provided are an impingement sleeve as defined in claim 1 and a method of forming an impingement sleeve as defined in claim 6. Embodiments of the present invention, for example, in comparison to concepts failing to include one or more of the features disclosed herein, increase cooling efficiency, facilitate control of fluid flow, distribute fluid flow within an impingement sleeve, facilitate adjusting impingement flow without modifying apertures in the impingement sleeve, increase component cooling, facilitate use of increased operating temperatures, facilitate formation of impingement sleeves using additive manufacturing, provide increased cooling with a decreased amount of fluid flow, or a combination thereof.

[0011] An impingement sleeve 100 includes any suitable article for facilitating cooling of a turbine component. As illustrated in FIG. 1, the impingement sleeve 100 includes a plurality of apertures 101 formed therein and at least two baffles 103 formed therein.

[0012] Referring to FIG. 2, a body portion 201 of the impingement sleeve 100 separates an inner region 203 and an outer region 205. The body portion 201 includes an inner surface 204, which faces the inner region 203, and an outer surface 206, which faces the outer region 205. The apertures 101 are formed in the body portion 201, fluidly connecting the inner region 203 to the outer region 205 and providing fluid flow between the inner region 203 and the outer region 205. For example, the apertures 101 may extend between the inner surface 204 and the outer surface 206, facilitating a flow of cooling fluid from the inner region 203 to the outer region 205.

[0013] Each of the apertures 101 includes any suitable geometry for fluidly connecting the inner region 203 and the outer region 205. Suitable geometries include, but are not limited to, circular, substantially circular, round, substantially round, oval, non-round, square, triangular, star shaped, polygonal, varied, irregular, any other geometrical shape, or a combination thereof. Additionally, the apertures 101 include any suitable orientation and / or spacing for facilitating cooling flow. Suitable spacing between the apertures 101 includes, but is not limited to, even, uniform, varied, gradient, sectioned, or a combination thereof. The geometry and / or spacing of the apertures 101 may be uniform, substantially uniform, or varied throughout the impingement sleeve 100, with the geometry and / or spacing of each of the apertures 101 being the same, substantially the same, and / or different from one or more other apertures 101 in the impingement sleeve 100.

[0014] The at least two baffles 103 are positioned along the inner surface 204 of the impingement sleeve 100, dividing the inner region 203 into one or more sub-regions 211.Arrangements with a single baffle are not in accordance with the invention, and are presented for illustration only. Each of the baffles 103 extends in any suitable direction, such as, but not limited to, axially, substantially axially, radially, substantially radially, or a combination thereof. The amount, positioning, and / or orientation of the baffles 103 is selected to provide a desired configuration of the sub-regions 211, such as, for example, to provide controlled pressure and / or cooling air flow. In one arrangement, as illustrated in FIG. 2, a single baffle 103 is secured to the inner surface 204, the single baffle 103 dividing the inner region 203 into one or more of the sub-regions 211. In one embodiment, as illustrated in FIG. 3, at least two baffles 103 are secured to the inner surface 204, the at least two baffles 103 dividing the inner region 203 into one or more of the sub-regions 211. As will be appreciated by those skilled in the art, any suitable number of baffles 103 may be provided to form any suitable number of sub-regions 211 within the inner region 203.

[0015] The at least two baffles 103 are configured to distribute fluid flow within the inner region 203 of the impingement sleeve 100. The distributing of the fluid flow within the inner region 203 includes, but is not limited to, introducing varying amounts of fluid to the sub-regions 211 formed by the baffle(s) 103, varying an orientation of the baffle(s) 103 to vary the fluid flow in one zone relative to another, varying an orientation of the baffle(s) 103 to concentrate fluid flow within one or more of the sub-regions 211, varying fluid flow through the one or more baffles 103, or a combination thereof. According to the invention, at least one of the baffles 103 includes a porous structure 403 (see FIG. 4), such as a mesh or mesh weave. The porous structure 403 includes a plurality of holes and / or passages that permit fluid flow directly through the porous structure 403. One or more openings 221 are formed in the baffle(s) 103. The one or more openings 221 are formed in the porous structure 403, and additional openings may be formed in a non-porous structure, such as a plate (see FIG. 2).

[0016] The one or more openings 221 in the non-porous structure provide fluid flow therethrough, while the one or more openings 221 in the porous structure 403 increase an amount of fluid flow therethrough. Varying a size, orientation, and / or amount of the openings in the baffle(s) 103, and / or varying a porosity of the porous structure 403, when present, varies the fluid flow through the baffle(s) 103, which varies the fluid flow within the inner region 203. Additionally, the baffle(s) 103 may include flow restrictor and / or flow preventers that modify and / or control fluid flow through the baffle(s) 103 and / or sub-regions 211. Suitable flow restrictors and / or flow preventers include, but not limited to, pin banks, brush bristles, or a combination thereof.

[0017] In one embodiment, the one or more baffles 103 vary a distribution of fluid flow between one or more of the sub-regions 211. In another embodiment, varying the distribution of fluid flow between one or more of the sub-regions 211 varies fluid flow through the apertures 101 corresponding to the one or more sub-regions 211. For example, in a further embodiment, the one or more baffles 103 are positioned to provide increased fluid flow within one of the sub-regions 211, as compared to another sub-region 211, the increased fluid flow within the sub-region 211 providing increased fluid flow through the apertures 101 in the sub-region 211.

[0018] Turning to FIG. 4, in one embodiment, the impingement sleeve 100 is configured for insertion and / or positioning within a component 400. The component 400 includes any suitable component, such as, but not limited to, a hollow component, a hot gas path component, a nozzle, a blade, a vane, or a combination thereof. When inserted and / or positioned within the component 400, the outer region 205 of the impingement sleeve 100 extends between the outer surface 206 of the cooling article and an inner surface 404 of the component 400. Additionally, when the impingement sleeve 100 is inserted and / or positioned within the component 400, the flow of fluid through the apertures 101 provides impingement cooling of the component 400. For example, a cooling fluid provided to the inner region 203 of the impingement sleeve 100 may pass through the apertures 101 to the outer region 205 where the cooling fluid contacts the inner surface 404 of the component 400 to cool the component 400. The orientation and / or spacing of the apertures 101 at least partially determines an amount, direction, and / or concentration of the fluid passing from the inner region 203 to the outer region 205. Additionally, the baffle(s) 103 and / or sub-regions 211 are arranged to modify, adjust, and / or control the fluid flow from the inner region 203 to the outer region 205. For example, the baffle(s) 103 and / or sub-regions 211 may be configured to provide a desired fluid flow profile through the apertures 101. Suitable fluid flow profiles include, but are not limited to, increased fluid flow in difficult to reach areas, increased fluid flow in areas exposed to increased temperatures, increased fluid flow in other areas where increased cooling is desired, or a combination thereof.

[0019] By distributing fluid flow within the inner region 203 and / or varying the distribution of fluid flow between the sub-regions 211, the baffle(s) 103 vary fluid flow through the apertures 101 without adjusting and / or modifying a number, size, and / or geometry of the apertures 101, without using multiple impingement sleeves 100, or a combination thereof.

[0020] For example, in one embodiment, the baffle(s) 103 provide flow control independent of the number, size, geometry, and / or placement of the apertures 101. In another embodiment, the independent flow control provided by the baffle(s) 103 facilitates use of desired parameter for the apertures 101 without or substantially without plugging the apertures 101. Additionally or alternatively, the baffle(s) 103 facilitate increased control over fluid flow, facilitate increased control over impingement cooling flow, provide increased cooling with a decreased amount of fluid flow, increase cooling efficiency, facilitate use of increased operating temperatures, or a combination thereof, as compared to impingement sleeves not including the baffle(s) 103 as described in one or more of the embodiments disclosed herein.

[0021] Forming the impingement sleeve 100 and / or the baffle 103 includes any suitable additive manufacturing method. Referring to FIGS. 5-6, in one embodiment, the additive method 500 includes making and / or forming net or near-net shape impingement sleeves 100 and / or baffle 103. As used herein, the phrase "near-net" refers to the impingement sleeve 100 and / or baffle(s) 103 being formed with a geometry and size very similar to the final geometry and size of the impingement sleeve 100 and / or baffle(s) 103, requiring little or no machining and processing after the additive method 500. As used herein, the phrase "net" refers to the impingement sleeve 100 and / or baffle(s) 103 being formed with a geometry and size requiring no machining and processing.

[0022] According to one or more of the embodiments disclosed herein, the additive method 500 includes integrally forming the one or more aperture 101 and / or the one or more baffle 103 integral with the impingement sleeve 100. Additionally or alternatively, the additive method 500 includes forming the one or more baffle 103 separate from the impingement sleeve 100, then securing the one or more baffle 103 to the impingement sleeve 100.

[0023] Securing the one or more baffle 103 to the impingement sleeve 100 includes, but is not limited to, welding, brazing, sintering, joining, interlocking, mechanically locking, or a combination thereof. Although described with regard to the aperture(s) 101 being formed during the additive method 500, as will be appreciated by those skilled in the art, at least one of the aperture(s) 101 may be machined into the impingement sleeve 100 after the additive method 500, without affecting the net or near-net geometry of the impingement sleeve 100.

[0024] The additive method 500 includes any manufacturing method for forming the impingement sleeve 100 and / or baffle(s) 103 through sequentially and repeatedly depositing and joining material layers. Suitable manufacturing methods include, but are not limited to, the processes known to those of ordinary skill in the art as Direct Metal Laser Melting (DMLM), Direct Metal Laser Sintering (DMLS), Laser Engineered Net Shaping, Selective Laser Sintering (SLS), Selective Laser Melting (SLM), Electron Beam Melting (EBM), Fused Deposition Modeling (FDM), or a combination thereof. In one embodiment, for example, the additive method 500 includes providing a metal alloy powder 601 (step 501); forming an initial layer 602 with the metal alloy powder 601 (step 502); sequentially forming an additional layer 622 over the initial layer 602 with the metal alloy powder 601 (step 503); and joining the additional layer 622 to the initial layer 602 to form the impingement sleeve 100 and / or baffle(s) 103 (step 504). In another embodiment, the additive method 500 includes repeating the steps of sequentially forming the additional layer 622 over a previously formed layer and joining the additional layer 622 to the previously formed layer (step 505) until the impingement sleeve 100 and / or baffle(s) 103 having a predetermined thickness and / or a predetermined shape are obtained. The previously formed layer includes any portion 611 of the impingement sleeve 100 and / or baffle(s) 103 including the initial layer 602 and / or any other additional layer(s) 622 directly or indirectly joined to the initial layer 602.

[0025] The initial layer 602 includes a preselected thickness 603 and a preselected shape, which, when forming the one or more apertures 101, includes at least one first opening 604. Each of the additional layers 622 includes a second preselected thickness 623 and a second preselected shape, the second preselected shape including at least one second opening 624 corresponding to the at least one first opening 604 in the initial layer 602, a shape corresponding to the outer surface 206, and / or a shape corresponding to the one or more baffles 103. The second preselected thickness 623 and / or the second preselected shape may be the same, substantially the same, or different between one or more of the additional layers 622. When joined, the preselected thickness 603 of the initial layer 602 and the second preselected thickness 623 of the additional layer(s) 622 form a combined thickness 633 of the portion 611. Additionally, the at least one first opening 604 and the corresponding at least one second opening 624 form one or more combined openings 634 in the portion 611. Once the impingement sleeve 100 is formed, the one or more combined opening 634 form the one or more apertures 101 fluidly connecting the inner region 203 to the outer region 205 of the impingement sleeve 100.

[0026] In one embodiment, the additive method 500 includes the DMLM process. In another embodiment, the DMLM process includes providing the metal alloy powder 601 and depositing the metal alloy powder 601 to form an initial powder layer. The initial powder layer has the preselected thickness 603 and the preselected shape including the at least one first opening 604. In a further embodiment, the DMLM process includes providing a focused energy source 610, and directing the focused energy source 610 at the initial powder layer to melt the metal alloy powder 601 and transform the initial powder layer to the portion 611 of the impingement sleeve 100 and / or baffle(s) 103. Suitable focused energy sources include, but are not limited to, laser device, an electron beam device, or a combination thereof.

[0027] Next, the DMLM process includes sequentially depositing additional metal alloy powder 601 over the portion 611 of the impingement sleeve 100 and / or baffle(s) 103 to form the additional layer 622 having the second preselected thickness 623 and the second preselected shape. After depositing the additional layer 622 of the metal alloy powder 601, the DMLM process includes melting the additional layer 622 with the focused energy source 610 to increase the combined thickness 633 and form at least a portion of the impingement sleeve 100. The steps of sequentially depositing the additional layer 622 of the metal alloy powder 601 and melting the additional layer 622 may then be repeated to form the net or near-net shape impingement sleeve 100 and / or baffle(s) 103. For example, the steps may be repeated until the impingement sleeve 100 having the predetermined thickness, the predetermined shape, the one or more apertures 101, and / or the one or more baffle(s) 103 is obtained.

[0028] Additionally or alternatively, the one or more baffles 103 may be formed separately from and / or after the forming of the impingement sleeve 100. For example, the baffle(s) 103 may be formed directly on a previously formed impingement sleeve 100 using the additive method 500, or the baffle(s) 103 may be formed separate from the impingement sleeve 100 then attached to the cooling article 100. Forming the baffle(s) 103 separate from the impingement sleeve 100 may include either the additive method 500 or a non-additive method, such as, machining, sintering, and / or casting. The forming of the impingement sleeve 100 and / or baffle(s) 103 using the additive method 500 facilitates the formation of baffle(s) 103 having increased complexity as compared to non-additive methods. Additionally or alternatively, when one or more of the baffles 103 are formed during the additive manufacturing of the impingement sleeve 100, the baffle(s) 103 may provide support to the impingement sleeve 100, facilitating formation of the body portion 201 having a decreased thickness, facilitating formation of longer and / or taller impingement sleeves 100, decreasing or eliminating deformation of the impingement sleeve 100 during manufacturing, maintaining a desired geometry of the impingement sleeve 100, or a combination thereof.

[0029] While the invention has been described with reference to one or more embodiments, it will be understood by those skilled in the art that various changes may be made without departing from the scope of the claims. In addition, many modifications may be made to adapt a particular situation or material to the teachings of the invention without departing from the scope of the claims. Therefore, it is intended that the invention not be limited to the particular embodiment disclosed as the preferred mode contemplated for carrying out this invention, but that the invention will include all embodiments falling within the scope of the appended claims. In addition, all numerical values identified in the detailed description shall be interpreted as though the precise and approximate values are both expressly identified.

Claims

1. An impingement sleeve (100), comprising: a body portion (201) separating an inner region (203) and an outer region (205); a plurality of apertures (101) in the body portion (201), the apertures (101) fluidly connecting the inner region (203) and the outer region (205); and at least two baffles (103) extending along at least a portion of an inner surface (204) of the body portion (201), the baffles (103) dividing the inner region (203) into a plurality of sub-regions (211); characterized in that: at least one of the baffles (103) comprises a porous structure (403) and includes at least one opening (221) extending through the porous structure.

2. The impingement sleeve (100) of any preceding claim, wherein the baffles (103) extend in a direction selected from the group consisting of axially, substantially axially, radially, substantially radially, and combinations thereof.

3. The impingement sleeve (100) of any preceding claim, wherein the porous structure comprises a mesh weave (403) or a porous plate (403).

4. The impingement sleeve (100) of any preceding claim, wherein the impingement sleeve (100) is arranged and disposed for insertion within a hot gas path component (400) of a turbine engine.

5. A component (400), comprising: a hollow component body; and an impingement sleeve (100) as claimed in any one of claims 1 to 4, disposed within the hollow component body.

6. A method of forming an impingement sleeve (100), the method comprising: forming a body portion (201) defining an inner region (203) and an outer region (205); forming a plurality of apertures (101) in the body portion (201), the apertures (101) fluidly connecting the inner region (203) to the outer region (205); and forming at least two baffles (103) extending along at least a portion of an inner surface (204) of the body portion (201), the at least two baffles (103) dividing the inner region (203) into a plurality of sub-regions (211), characterized in that: at least one of the baffles (103) comprises a porous structure (403), and includes at least one opening (221) extending through the porous structure; and inserting the impingement sleeve (100) into a component (400), the impingement sleeve (100) providing impingement cooling of the component (400); wherein at least one of forming the body portion (201), forming the plurality of apertures (101), and forming the at least two baffles (103) comprises additive manufacturing.

7. The method of claim 6, wherein forming the at least two baffles (103) comprises integrally forming the baffles (103) with the body portion (201).

8. The method of claim 6 or 7, wherein forming the at least two baffles (103) comprises separately forming the baffles (103) from the body portion (201), then securing the baffles (103) to the body portion (201).