Coupling for double-walled pipe

Abstract

The invention relates to a coupling and a support for a double-walled pipe. A support for a coaxial flange of a dual coaxial coupler is provided. The support includes an annular support structure. The annular support structure provides a primary mounting region for attaching a primary flange connected to the primary outer tube and a secondary mounting region for attaching a secondary flange connected to the secondary inner tube, the secondary inner tube being coaxial with the primary outer tube. The primary mounting region and the secondary mounting region are spaced apart from each other in a radial direction for centering the primary flange and the secondary flange in a radially spaced coaxial manner. The primary mounting region provides a peripheral connection region having at least three mounting points for attaching the primary flange. The secondary mounting region provides an inner peripheral connection region having at least three mounting points for attaching the secondary flange. A thermal path within the annular support structure between a mounting point of the primary mounting region and adjacent and spaced mounting points of the secondary mounting region is longer than a distance between the two mounting points.

Description

Technical Field

[0001] The present invention relates to temperature resistant pipe connections, and more particularly to supports, couplers, dual coaxial conduits, dual coaxial pipe systems, aircraft, and methods for providing supports. Background Art

[0002] Some energy supply facilities, such as fuel cell energy systems, may need to transport cryogenic fuel from a storage tank to a chemical power conversion unit. This can be achieved by means of a dedicated fuel supply pipeline that includes an insulation structure and is interconnected to run between the storage tank and the chemical power conversion unit. However, the temperature of the cryogenic fuel may stress the interconnections of the dedicated fuel supply pipeline and its insulation structure. Therefore, this may further lead to increased monitoring and maintenance requirements. Summary of the invention

[0003] Therefore, it may be desirable to provide improved interconnections to supply lines suitable for cryogenic fuels.

[0004] The object of the invention is solved by the subject matter of the main aspect of the invention; further embodiments are incorporated into the subsidiary aspects of the invention. It should be noted that the various aspects of the invention described below are also applicable to a support, a coupling, a dual coaxial duct, a dual coaxial pipe system, an aircraft and a method for providing a support.

[0005] According to the present invention, a support for a coaxial flange of a dual coaxial connector is provided. The support comprises an annular support structure. The annular support structure provides each of the following: a primary mounting area for attaching a primary flange for connecting a primary outer tube; and a secondary mounting area for attaching a secondary flange for connecting a secondary inner tube coaxial with the primary outer tube. The primary mounting area and the secondary mounting area are spaced apart from each other in the radial direction for centering the primary flange and the secondary flange in a radially spaced coaxial manner. The primary mounting area provides an outer peripheral connection area having at least three mounting points for attaching the primary flange. The secondary mounting area provides an inner peripheral connection area having at least three mounting points for attaching the secondary flange. The thermal path between the mounting point of the primary mounting area and the adjacent and spaced mounting points of the secondary mounting area within the annular support structure is longer than the distance between the two mounting points.

[0006] As an example, a thermal path is provided as an extended material-based connection from a mounting point of a primary mounting area to an adjacent and spaced-apart mounting point of a secondary mounting area. The thermal path is longer than the direct distance or direct connection between the mounting points. The material-based connection provides a connector that is more like a bow. With respect to the transfer of thermal energy, the energy is guided via an elongated path; the energy can be said to travel a longer path than the direct route between the mounting points. The individual mounting points of the primary mounting area are themselves separate and thermally isolated from each other; the same is true for the spaced-apart mounting points.

[0007] As an example, a thermal path is a spacing element of an annular support structure that keeps mounting points of a primary mounting area and adjacent and spaced mounting points of a secondary mounting area separated from each other while providing a connection between mounting points of the primary mounting area and adjacent and spaced mounting points of the secondary mounting area. The thermal path is a spacing element that keeps the primary flange and the secondary flange at a specified distance. The spacing element defines an annular cavity between the primary flange and the secondary flange, which is used to thermally isolate the primary flange and the secondary flange. Therefore, heat can travel between the primary flange and the secondary flange along the thermal path.

[0008] In an example, the thermal path is a spacer element formed to direct heat flow between the primary flange and the secondary flange at a mounting point of the primary mounting area and an adjacent and spaced-apart mounting point of the secondary mounting area.

[0009] The term flange refers to a right-angled protruding edge used to connect two parts that are flush with each other. Flanges can be provided at the ends of pipes and other rod-shaped parts. Flanges can be welded to the ends of pipes as flange rings. Flange rings are usually provided with holes according to a fixed pattern so that two adjacent flanges can be connected with nuts and bolts. In this way, two pipes can be connected to each other by abutting the flanges.

[0010] In an example, a flange-based connection is superior to a connection provided by inserting the pipe ends into each other, while being easier and faster to disconnect and being less restrictive to thermally stressing the connection.

[0011] As an effect, the heat transfer between the first flange and the second flange is slowed down. As an advantage, the thermal gradient between the primary flange and the secondary flange is reduced more slowly. As a further advantage, the thermal stresses in the material of the dual coaxial coupling are reduced. As a further advantage, ice formation or air liquefaction in cryogenic applications is avoided. As an advantage, the longer load path of the connection between the primary flange and the secondary flange provides more flexibility between the primary flange and the secondary flange. As a further advantage, a direct structural connection from the inner tube to the outer tube sealing area in the radial plane is avoided. Thus, the need for monitoring and maintenance is reduced.

[0012] According to an example, the annular support structure can be preloaded by a force acting between a mounting point of the primary mounting area and a mounting point of the secondary mounting area.

[0013] According to an example, the annular support structure comprises a U-shaped profile in its axial cross section. The U-shaped profile is open towards the mounting point of the primary mounting area and the mounting point of the secondary mounting area. The U-shaped profile provides stiffness in the axial direction and in the radial direction between the mounting point of the primary mounting area and the mounting point of the secondary mounting area.

[0014] According to an example, the legs of the U-shaped profile comprise a sleeve-like structure. The top of the U-shaped profile comprises a ring-like structure.

[0015] According to the present invention, a coupling is also provided. The coupling comprises a primary flange, a secondary flange, and a support according to one of the aforementioned examples. The support rigidly connects the primary flange and the secondary flange and centers the secondary flange and the primary flange in a radially spaced coaxial manner. The primary flange and the secondary flange are respectively provided with axially facing flange sides for tightly sealingly connecting the coupling to the corresponding counterpart.

[0016] As an advantage, the reduction in heat transfer between the primary flange and the secondary flange prevents temperature-induced deformation of the primary flange and the secondary flange.

[0017] As an advantage, the reduction in heat transfer between the primary flange and the secondary flange prevents temperature-induced deformation of the primary flange relative to the secondary flange.

[0018] As a further advantage, increasing the time to reach temperature equilibrium between the inner tube of the secondary flange and the outer tube of the primary flange, respectively, may lead to omitting and / or avoiding the use of additional thermal insulation at the flanges.

[0019] As a further advantage, the coupling or double-walled pipe flange withstands stresses caused by temperature shocks of the inner pipe medium of, for example, 50 K at the primary flange and the outer pipe environment of 300 K at the secondary flange.

[0020] As an advantage, forces exerted on the primary flange can be transferred via the support to the secondary flange, and forces exerted on the secondary flange can be transferred via the support to the primary flange.

[0021] As an advantage, the force exerted on the primary flange can be used to sealingly press the secondary flange to the abutting secondary flange.

[0022] As an advantage, a double-walled pipe flange, ie a coupling, enables a continuous air gap and at the same time a relatively low heat transfer from an attached inner pipe to an attached outer pipe or in the reverse direction.

[0023] As an advantage, while maintaining the same basic functionality of a double wall pipe flange for a continuous gap, excessive stresses will not occur in the coupling due to large temperature gradients.

[0024] According to the present invention, a dual coaxial conduit is also provided. The dual coaxial conduit comprises a dual coaxial tube arrangement having a primary outer tube and a secondary inner tube, and at least one connector according to one of the aforementioned examples. A circumferential portion of one end of the primary outer tube is sealingly attached to a primary flange of the connector. A circumferential portion of one end of the secondary inner tube is sealingly attached to a secondary flange of the connector. The annular support structure comprises an axially oriented channel between an inner side of the primary outer tube and an outer side of the secondary inner tube.

[0025] As an advantage, heat transfer between the primary outer tube and the secondary inner tube is reduced.

[0026] As an advantage, flexibility is provided between the primary outer tube and the secondary inner tube.

[0027] As an advantage, already assembled preassembled double-walled pipe components can be used.

[0028] As a further advantage, advantages in manufacturing, repair and spare parts handling and / or warehousing of the dual coaxial pipe system are provided.

[0029] According to the present invention, a dual coaxial pipe system is also provided. The dual coaxial pipe system comprises at least two dual coaxial pipes according to one of the aforementioned examples and at least one fastening structure. The fastening structure provides a clamping force by pressing adjacent primary flanges of at least two dual coaxial pipes against each other.

[0030] As an advantage, a tube system is created which allows a coaxial flow of two different fluid streams.

[0031] As an advantage, a compact and temperature-resistant tube system is produced.

[0032] As an advantage, a stress-resistant pipe system is produced.

[0033] According to the present invention, an aircraft is also provided. The aircraft includes a fluid reservoir storing fluid, at least one load configured to be operated by the fluid, and the dual coaxial pipe system of the above example. The dual coaxial pipe system supplies the fluid from the fluid reservoir to the at least one load.

[0034] As an advantage, an aircraft is produced which has a pipe system which is protected against hydrogen leakage.

[0035] As another advantage, a safer aircraft results.

[0036] According to the present invention, there is also provided a method for providing a support for a coaxial flange of a dual coaxial connector. The method comprises the following steps:

[0037] - providing an annular support structure,

[0038] - providing a primary mounting area at the annular support structure for attaching a primary flange for connecting the primary outer pipe,

[0039] - A secondary mounting area for attaching a secondary flange is provided at the annular support structure, the secondary flange being used to connect a secondary inner tube coaxial with the primary outer tube. The primary mounting area and the secondary mounting area are spaced apart from each other in the radial direction so that the primary flange and the secondary flange are centered in a radially spaced coaxial manner. The primary mounting area provides an outer peripheral connection area having at least three mounting points for attaching the primary flange. The secondary mounting area provides an inner peripheral connection area having at least three mounting points for attaching the secondary flange. The thermal path within the annular support structure between a mounting point of the primary mounting area and an adjacent and spaced-apart mounting point of the secondary mounting area is longer than the distance between the two mounting points.

[0040] According to one aspect, a connector for a tube-in-tube arrangement is provided. The connector is configured to be used for both the inner tube and the outer tube of the tube-in-tube arrangement. The connector includes two radial connection parts, one radial connection part for each tube. The connector can be attached to another tube-in-tube arrangement. In order to slow down the heat exchange between the two radial connection parts, the interconnecting parts of the two radial connection parts are configured as an elongated thermal conductor between the two radial connection parts. The thermal path is arranged to extend away from the radial plane of the flange connection. In this way, direct thermal and mechanical contact of the two radial connection parts in their radial planes is avoided. In general, in the case where the inner tube and the outer tube have different temperatures, the mechanical stress at the connection part is reduced in this way.

[0041] According to one aspect, the inner tube or inner pipe is placed in the outer tube or outer pipe, and the coupling area or connection area is arranged at the end of both the inner tube and the outer pipe. At the connection area, the inner tube is kept at the outer tube. Under the premise of providing a stable connection, the inner tube is kept at the outer tube, and on the other hand, this stable connection is modified to reduce the heat energy transfer between the inner tube or inner pipe and the outer tube or outer pipe at the connection area. This stable connection is further formed to provide a fluid flow in the gap between the inner tube and the outer pipe, and the fluid flow exceeds the connection area and continues to enter the gap of the abutting inner tube and outer tube arrangement structure. This stable connection is formed under the compromise of providing a stable connection and providing a fluid flow in the gap at the same time. This stable connection is further formed to minimize the physical contact between the inner tube and the outer tube while still connecting the inner tube and the outer tube. This stable connection is further formed to keep the inner tube and the outer tube spaced apart so that they are thermally isolated from each other, while allowing the fluid to flow in the gap between the outer tube and the inner tube. The stable connection between the inner and outer pipes meets these conditions, namely, this stable connection is longer than the direct connection and the direct radial distance between the inner and outer pipes, and this stable connection is similar to an elongated connection that prolongs the material-related heat transfer path between the inner and outer pipes.

[0042] According to one aspect, a spacer element for connecting the ends of double-walled pipes is provided. The spacer element keeps the connected ends separated from each other while connecting the connected ends. The spacer element provides an elongated material path between the connected ends that is longer than the direct radial distance between the connected ends so as to extend the direct load path and direct heat transfer route between the connected ends.

[0043] According to one aspect, a coupling is provided that enables fluid to flow in the interstices of abutting first double-walled tubes and abutting second double-walled tubes. The coupling provides a connection of the fluid flows of the two double-walled tubes and enables the fluid to flow in the interstices of the two double-walled tubes beyond the coupling. The coupling provides fluid flow through a connection at the coupling that is permeable to gas on the one hand and also connects and keeps the inner and outer tubes of the double-walled tubes separate on the other hand.

[0044] According to one aspect, a support element is provided that resembles a structural conformity between an inner tube and an outer tube that is centered within an outer tube to stabilize the connection while minimizing contact between the inner tube and the outer tube.

[0045] These and other aspects of the invention will be apparent from and elucidated with reference to the embodiments described hereinafter. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] Exemplary embodiments of the present invention will be described below with reference to the accompanying drawings:

[0047] Figure 1 A general scheme of a cross section through a primary outer tube including an example of a support is shown.

[0048] Figure 2 An example of a support is shown.

[0049] Figure 3 A cross section through an example of a support, a coupling and a dual coaxial conduit is schematically shown.

[0050] Figure 4 Examples of dual coaxial catheters and dual coaxial tube systems are schematically shown.

[0051] Figure 5 An example of an aircraft including a dual coaxial tube system is schematically shown.

[0052] Figure 6 The basic steps of an example of a method for providing support for coaxial flanges of a dual coaxial coupling are shown. DETAILED DESCRIPTION

[0053] Certain embodiments will now be described in more detail with reference to the accompanying drawings. In the following description, the same reference numerals are used for the same elements even in different drawings. The contents defined in the specification, such as detailed construction and elements, are provided to help fully understand the exemplary embodiments. In addition, well-known functions or constructions are not described in detail because they would make the embodiments unclear due to unnecessary details. In addition, expressions such as "at least one of..." when preceding a list of elements modify the entire list of elements rather than modifying the individual elements of the list.

[0054] In the example, a double-walled pipe flange, i.e. a coupler, is provided, which is used for a continuous gap, a continuous shield, such as a fuel pipeline with a shield. The continuous shield / gap can usually be emptied. Usually, the inner tube flange, i.e. the secondary flange, is structurally directly connected to the outer tube flange, i.e. the primary flange. Functionally, the inner tube flange and the outer tube flange are separated in terms of medium flow. This is achieved by using at least two seals and / or using gaskets and circumferential drillings or the like between these seals to achieve a continuous gap. This works well when the temperature difference between the inner tube and the outer tube or the environment is not large. If there is a huge temperature difference or temperature shock, huge stress values ​​will thus appear in the flange due to the direct structural connection and therefore also due to the direct heat conduction path.

[0055] Figure 1The general scheme of a cross section through an example of a primary outer tube including a support is shown. The support 10 for the coaxial flange 12 of the dual coaxial coupling 14 includes an annular support structure 16. The annular support structure 16 provides a primary mounting area 18 for attaching a primary flange 20 connected to a primary outer tube 22 and a secondary mounting area 24 for attaching a secondary flange 26 connected to a secondary inner tube 28, which is coaxial with the primary outer tube 22. Figure 1 As shown by arrow 30 in FIG. 1 , the primary mounting area 18 and the secondary mounting area 24 are spaced apart from each other in the radial direction so as to center the primary flange 20 and the secondary flange 26 in a radially spaced coaxial manner, as shown in FIG. Figure 1 The primary mounting area 18 provides an outer peripheral connection region 34 having at least three mounting points 36 for attaching the primary flange 20. The secondary mounting area 24 provides an inner peripheral connection region 38 having at least three mounting points 40 for attaching the secondary flange 26. Figure 1 The thermal path within the annular support structure 16 , indicated by arrows 42 , between a mounting point 44 of the primary mounting area 18 and an adjacent and spaced-apart mounting point 46 of the secondary mounting area 24 is longer than the distance between the two mounting points.

[0056] The support member 10 may also be referred to as a spacer, a spacer or an adapter, a coupling, a joining member, a connector, a link, a joining member or an interconnecting member.

[0057] In an example, the support is made by additive manufacturing.

[0058] Primary may also be referred to as first, firstly, or outer, and may also be referred to as second, secondly, or inner.

[0059] The secondary may also be referred to as second, secondly, or inner, and may also be referred to as first, firstly, or outer.

[0060] In the example, the support 10 can also be understood as a radial clamp or clamp, which Figure 1 Not shown in FIG.

[0061] The coaxial flange 12 can also be referred to as a connecting element or a coupling element.

[0062] The term "coaxial" refers to a manner of arranging linear hollow objects along a common direction, wherein one hollow object surrounds another hollow object, such as Figure 1 shown.

[0063] The term "coaxial flange" refers to a smaller flange arranged within a larger flange, wherein the two flanges are oriented with the same vector in space.

[0064] In examples, the flanges may deviate from their coaxial arrangement in that they are not equally spaced from each other.

[0065] The term "flange" refers to a connecting element at an end portion of a pipe or a tube, which can abut against another flange of another pipe to establish a connection between the pipe and the other pipe.

[0066] The term "dual coaxial coupling" refers to a smaller flange surrounded by a larger flange - respectively Figure 1 The secondary flange 26 and the primary flange 20 in the above-mentioned flange arrangement structure, wherein both the smaller flange and the larger flange are configured to establish a connection with the smaller flange and the larger flange of another coaxial flange arrangement structure.

[0067] The term "annular support structure" refers to an annular connection device which is formed to follow the annular end portion of a pipe.

[0068] A zone may also be called a region.

[0069] The term "mounting area" refers to an area that is strong enough to keep the flange and its associated pipe section separate.

[0070] The term "primary outer tube" may also be referred to as outer tube or external tube.

[0071] The term "secondary inner tube" may also be referred to as an inner tube or internal tube.

[0072] The term "attachment" refers to a welded connection or a material-locked connection between the mounting area and the flange, e.g. Figure 1 .

[0073] The term "outer tube" refers to a pipe or tube that is large enough in the radial direction to provide its inner lumen to a smaller pipe or tube.

[0074] The term "radial direction", also denoted "radially", is defined by the radius defining the inner luminal volume of the tube.

[0075] In the examples, the axial direction, also indicated as "axially", is defined by the length defining the inner luminal volume of the tube, e.g. Figure 1 .

[0076] The term "inner tube" refers to a pipe or tube that is small enough to be contained by an outer tube, such as Figure 1 shown.

[0077] In examples, the tube may be oval or include an angular profile.

[0078] In an example, the tubes are configured to convey gas.

[0079] In examples, the tubes are configured to transport cryogenic hydrogen.

[0080] The term "spaced apart" refers to the following arrangement of the primary mounting area 18 relative to the secondary mounting area 24 at the annular support structure 16: the arrangement is such that they do not contact each other, and in the radial direction, a certain distance is set between the primary mounting area 18 and the secondary mounting area 24, such as Figure 1 shown.

[0081] In the example, the annular support structure 16 is formed such that it provides an intermediate annular cavity separating the primary flange 20 from the secondary flange 26, such as Figure 1 shown.

[0082] In an example, the intermediate annular cavity is configured to thermally isolate the second coupling element from the first coupling element.

[0083] The term “centering” refers to the function of the annular support structure 16 to align the secondary flange 26 within the primary flange 20 .

[0084] In the example, the secondary flange 26 and the primary flange 20 are centered at different locations. Figure 1 Not shown in FIG.

[0085] The term "radially spaced coaxially" refers to an arrangement in which the smaller secondary flange 26 and the larger primary flange 20 include the same center.

[0086] The term "mounting point" refers to the area that provides a direct physical connection between the inner peripheral connection area 38 and the secondary flange and between the outer peripheral connection area 34 and the primary flange 20, such as Figure 1 shown.

[0087] In the example, more than at least three mounting points 36 , 40 are provided, for example four, five or eight mounting points.

[0088] In the example, at least three mounting points 36 , 40 are provided to prevent displacement of the primary flange 20 relative to the secondary flange 26 .

[0089] In the example, at least three mounting points 36 , 40 are provided as welded, brazed, adhesively bonded connections between the outer peripheral connection area 34 and the primary flange 20 and between the inner peripheral connection area 38 and the secondary flange 26 .

[0090] In the example, at least three mounting points 36, 40 are interconnected to create a single mounting point.

[0091] In the example, at least three mounting points 36 , 40 are provided by a single weld line.

[0092] In the example, at least three mounting points 36 , 40 are provided by manufacturing the annular support structure 16 having the primary flange 20 and the secondary flange 26 from a single piece.

[0093] In an example, at least three mounting points 36 , 40 are provided by manufacturing the annular support structure 16 having the primary flange 20 and the secondary flange 26 from a single piece by casting, CNC machining, or additive manufacturing.

[0094] In the example, at least three mounting points 36 , 40 represent a material-locked connection between the annular support structure 16 and the primary flange 20 and the secondary flange 26 .

[0095] The term "inner peripheral connection area" refers to an area formed to be connected to the outer area of ​​the secondary flange 26, which is not part of the inner cavity of the inner tube, such as Figure 1 shown.

[0096] The term "peripheral connection area" refers to an area formed to connect with the inner area of ​​the primary flange 20, which is a part of the inner cavity of the outer tube, such as Figure 1 shown.

[0097] The term "thermal path" refers to the load path between a mounting point 44 of the primary mounting area 18 and an adjacent and spaced-apart mounting point 46 of the secondary mounting area, such as Figure 1 As shown by arrow 42 in FIG.

[0098] In the example, the thermal path of the annular support structure 16 is represented as an elongated connection. The elongated connection serves as a load path to transfer externally applied forces from the primary flange 20 to the internal secondary flange 26.

[0099] In the example, the load path within the annular support structure 16 between a mounting point 44 at the primary mounting area 18 and an adjacent and spaced-apart mounting point 46 at the secondary mounting area is longer than the distance between the two mounting points, as also indicated by Figure 1 As shown by arrow 42 in FIG.

[0100] In an example, the thermal path is constructed as an elongated material-based connection between a mounting point 44 of the primary mounting area 18 and an adjacent and spaced-apart mounting point 46 of the secondary mounting area. The thermal path is constructed as an elongated material-based connection that is longer than the direct distance or direct connection between the mounting point 44 of the primary mounting area 18 and the adjacent and spaced-apart mounting point 46. The material-based connection serves as a connecting or bridging element between the mounting point 44 of the primary mounting area 18 and the adjacent and spaced-apart mounting point 46. Thermal energy at the mounting point 44 of the primary mounting area is directed to the adjacent and spaced-apart mounting point 46 of the secondary mounting area through the elongated material-based connection, and travels a longer distance than the shortest direct distance between the mounting point 44 of the primary mounting area 18 and the adjacent and spaced-apart mounting point 46. The individual mounting points 44 of the primary mounting area are separated and thermally isolated from each other, and the spaced-apart mounting points 46 are also separated and thermally isolated from each other.

[0101] In the example, the thermal path is configured as a spacing element of the annular support structure 16 that keeps the mounting points 44 of the primary mounting area 18 and the adjacent and spaced mounting points 46 of the secondary mounting area separated from each other. The thermal path is also configured as a spacing element that keeps the primary flange 20 and the secondary flange 26 separated. The spacing element keeps the primary flange 20 and the secondary flange 26 separated to form an annular cavity between the primary flange 20 and the secondary flange 26. The spacing element forms an annular cavity between the primary flange 20 and the secondary flange 26 to thermally isolate the primary flange 20 and the secondary flange 26. In this example, the only way heat can travel between the primary flange 20 and the secondary flange 26 is the thermal path.

[0102] In an example, the thermal path is a spacer element formed to direct heat flow between the primary flange 20 and the secondary flange 26 at a mounting point 44 of the primary mounting area 18 and an adjacent and spaced-apart mounting point 46 of the secondary mounting area.

[0103] In an example, the thermal path is the shortest and most direct possible path that heat can travel through the material between the mounting point 44 of the primary mounting area 18 and the adjacent and spaced apart mounting points 46 of the secondary mounting area. The thermal path does not follow a zigzag path or any other random path, it follows a straight line and in some cases a curve.

[0104] In the example, the annular support structure 16 is made of a heat-insulating material in order to slow down the heat transfer between the primary flange 20 and the secondary flange 26 .

[0105] In an example, the material of the annular support structure 16 comprises a specific material that is not susceptible to hydrogen embrittlement. Figure 1 Not shown in FIG.

[0106] In an example, the material of the annular support structure 16 comprises a specific austenitic steel that is not susceptible to hydrogen embrittlement.

[0107] exist Figure 1 In the example of FIG. 4 , the primary mounting area 18 is configured as a circumferential primary mounting area 48 . The secondary mounting area 24 is configured as a circumferential secondary mounting area 50 .

[0108] In the example, the circumferential mounting area is configured as an annular area, which is Figure 1 Not shown in FIG.

[0109] In another example, the circumferential mounting area is configured as a square area. Figure 1 Not shown in FIG.

[0110] In another example, the circumferential mounting area is provided as an oval or elliptical area. Figure 1 Not shown in FIG.

[0111] exist Figure 1 In the exemplary option of , the primary mounting area 18 and the secondary mounting area 24 are provided by a plurality of, at least three brackets 52, each bracket providing a mounting point 44 for the primary mounting area 18 and a mounting point 46 for the secondary mounting area 24. A circumferential connector 54 is provided, which provides a common mounting portion for the plurality of, at least three brackets 52.

[0112] The term "stent" refers to an object having a bent shape with two limbs with end connection points.

[0113] In the example, more than at least three brackets 52 are provided, for example four, five or eight brackets are provided.

[0114] In the example, the circumferential connector 54 is a wire or a ring-shaped object, such as Figure 1 shown.

[0115] In an example, the circumferential connector 54 comprises a thermal energy storage.

[0116] As an advantage, the plurality of, at least three, brackets 52 reduce the heat transfer from the primary flange 20 to the secondary flange 26 in the case of a thinner material cross section thereof.

[0117] Advantageously, the plurality, at least three, of brackets 52 provide flexibility of the primary flange 20 relative to the secondary flange 26 .

[0118] exist Figure 1 In the example of FIG. 1 , for axially oriented fluid flow, the annular support structure 16 has an axially oriented passage 56 between the circumferential primary mounting area 48 and the circumferential secondary mounting area 50 .

[0119] In the example, the circumferential primary mounting area 48 and the circumferential secondary mounting area 50 are arranged spaced apart from each other in radial direction for allowing axial flow in the annular tube volume provided by the coaxially extending primary outer tube 22 and secondary inner tube.

[0120] The annular tube volume portion may also be referred to as an annular volume portion.

[0121] The term “axially oriented passage” refers to passages and / or holes provided at the annular support structure 16 that allow fluid to pass through.

[0122] The term "fluid" refers to a liquid or gas that continuously deforms, ie flows, such as under the influence of applied shear stress or external force.

[0123] As an advantage, Figure 1 In the embodiment of the present invention, fluid can be directed between the primary flange 20 and the secondary flange 26 .

[0124] exist Figure 1 In the example of FIG. 4 , the annular support structure 16 can be preloaded by a force acting between a mounting point 44 of the primary mounting area and a mounting point 46 of the secondary mounting area.

[0125] In the example, the mounting point 44 of the primary mounting area 18 and the adjacent and spaced apart mounting point 46 of the secondary mounting area 24 are the mounting point 44 of the primary mounting area 18 and the mounting point 46 of the secondary mounting area 24 .

[0126] The term "capable of being preloaded" refers to the function of the annular support structure 16 to store potential energy through the elasticity of its material. Figure 1 Not shown in FIG.

[0127] In the example, the annular support structure 16 acts like a spring.

[0128] Advantageously, the primary flange and the secondary flange are connected elastically in order to avoid temperature-induced stresses.

[0129] Figure 2 An example of a support 10 is shown. The primary mounting area 18 is also arranged as a circumferential primary mounting area 48, and the secondary mounting area 24 is arranged as a circumferential secondary mounting area 50. The primary mounting area 18 and the secondary mounting area 24 are also provided by a plurality of at least three brackets 52, each bracket providing a mounting point 53a for the primary mounting area 18 and a mounting point 53b for the secondary mounting area 24. Figure 2 In the embodiment, there is no circumferential connector 54 that provides a common mounting portion for the plurality of, at least three, brackets 52 .

[0130] In the example, at least three brackets 52 comprise a U-shaped profile.

[0131] In the example, at least three brackets 52 include a V-shaped profile.

[0132] In the example, at least three brackets 52 comprise a spring-like profile.

[0133] In the example, at least three brackets 52 are made of springs.

[0134] In an example, at least three brackets and the support are made from the same single piece.

[0135] Figure 3 Schematically a cross section through an example of a support 10 is shown. The annular support structure 16 of the support 10 comprises a U-shaped profile 58 in its axial cross section. The U-shaped profile 58 opens towards the mounting point 44 of the primary mounting area 18 and the mounting point 46 of the secondary mounting area 24. The U-shaped profile 58 provides stiffness in the axial direction and in the radial direction between the mounting point 44 of the primary mounting area 18 and the mounting point 46 of the secondary mounting area 24.

[0136] In the example, the top of the U-shaped profile 58 includes a thermal reservoir for storing heat and slowing down the transfer of cooling. Figure 3 Not shown in FIG.

[0137] The term "U-shaped profile" is to be understood as a cup-shaped structure.

[0138] In the example, the U-shaped profile 58 encloses an annular cavity, such as Figure 3 shown.

[0139] In an example, the U-profile is a V-profile having a V-shape with a corner as a top and straight V-legs.

[0140] In an example, the U-shaped profile comprises a hybrid between a U-shape and a V-shape.

[0141] In the example, the annular support structure 16 of the support 10 comprises a V-shaped profile 58 in its axial cross section. The V-shaped profile 58 opens toward the mounting point 44 of the primary mounting area 18 and the mounting point 46 of the secondary mounting area 24. The V-shaped profile 58 provides stiffness in the axial direction and in the radial direction between the mounting point 44 of the primary mounting area 18 and the mounting point 46 of the secondary mounting area 24.

[0142] As an advantage, the force transmission between the mounting point of the primary mounting area and the mounting point of the secondary mounting area is improved.

[0143] exist Figure 3 In the example of FIG. 5 , the leg 60 of the U-shaped profile 58 includes a sleeve-like structure 62 . The top 64 of the U-shaped profile 58 includes a ring-like structure 66 .

[0144] In an example, the annular structure 66 includes a thermal reservoir for storing heat and slowing down the transfer of cooling.

[0145] In the example, the sleeve-like structure 62 and the ring-like structure 66 are made of a single piece.

[0146] In the example, the U-shaped profile 58 includes a corner at the transition from the leg 60 to the top 64 to increase the rigidity of the U-shaped profile 58. Figure 3 shown.

[0147] In the example, the annular structure 66 includes an axially oriented channel 56 for passing a fluid, such as Figure 3 shown.

[0148] In an example, the sleeve and the ring form a sleeve-ring-sleeve portion.

[0149] In the example, the load path length is increased by means of the "sleeve-ring-sleeve section" and the direct connection between the primary flange 20 and the secondary flange 26 is cut off, such as Figure 3 shown.

[0150] In the example, the longer load path acts like a spring. The longer load path confers sufficient flexibility in the radial direction, while being rigid enough in the axial direction to maintain a fixed load for the seal in order to ensure the leak-proofness of the secondary flange 26, which will be additionally adjusted by a specific preload of the "sleeve-ring-sleeve part".

[0151] As an advantage, the longer load path in the U-shaped profile enables flexibility in the radial direction while being relatively rigid in the axial direction.

[0152] Figure 3 A cross section through an example of a coupling 100 is also schematically shown. The coupling 100 comprises a primary flange 102, a secondary flange 104, and a support 106 according to one of the aforementioned examples and options. The support 106 rigidly connects the primary flange 102 and the secondary flange 104 and centers the secondary flange 104 and the primary flange 102 in a coaxial radially spaced manner. The primary flange 102 and the secondary flange 104 are respectively each provided with an axially facing flange side 108, which is used to tightly seal the coupling 100 to the corresponding counterpart.

[0153] The term "corresponding counterpart" refers to an adjacent coupling that abuts against the coupling and / or to an abutting flange of an end portion of a pipe and / or to a matching end portion of another system. For example, Figure 3The abutting couplers, not shown, the abutting flanges of the end portions of the pipes, and the end portions of the other systems are configured to provide a tightly sealed transfer of fluid via the abutting couplers.

[0154] The term "rigidly" refers to the property that the structure of the support 106 is capable of being preloaded.

[0155] The term "tightly sealed connection of the coupling" refers to a gas-tight connection between the flanges.

[0156] In an example, the gas leak-proof connection is configured to reduce the amount of hydrogen gas that is present in the Figure 3 Diffusion between connections of corresponding mating parts is not shown.

[0157] In the example, the coupling 100 provides a gas leak-proof connection between the primary flange 102 and another adjacent primary flange and between the secondary flange 104 and another adjacent secondary flange. Figure 3 Not shown in FIG.

[0158] In the example, the primary flange 102 and the secondary flange 104 include at least one recess having a sealing portion for establishing a tight sealing connection with the adjacent primary and secondary flanges. Figure 3 Not shown in FIG.

[0159] exist Figure 3 In the example of , the axially facing flange side 108 of the primary flange 102 is configured to tightly sealably abut against the axially facing flange side 108 of the primary flange of the adjacent coupling. The axially facing flange side 108 of the secondary flange 104 is configured to tightly sealably abut against the axially facing flange side 108 of the secondary flange of the adjacent coupling.

[0160] In the example, the surface of the axially facing flange side 108 is machined so as to provide a tight sealing abutment with the other axially facing flange side, thereby preventing diffusion of gas, in particular hydrogen.

[0161] As an advantage, the flexible bearing prevents deformation of the coupling which would prevent the axially facing flange sides of the secondary flange from sealingly abutting against an adjoining coupling.

[0162] exist Figure 3In the example of FIG. 1 , the primary flange 102 includes at least one fastening area 110 for receiving an axial clamping force of the flange fastening structure for pressing the axially facing flange side 108 of the primary flange 102 to the abutting axially facing primary flange side of the adjacent coupling. The annular support structure 111 is configured to transmit the axial clamping force to the secondary flange 104 for pressing the axially facing flange side 108 of the secondary flange 104 to the abutting axially facing secondary flange side of the adjacent coupling, which is Figure 3 Not shown in FIG.

[0163] The term "fastening area" refers to a recess, hole, protrusion, nose, hook that can be used to retain the fastening structure.

[0164] The term "flange fastening structure" refers to an object that is capable of transmitting force between two different flanges so that the two different flanges are combined to form a tight connection.

[0165] In an example, the flange fastening structure is a bolt structure including a bolt element and a bolt fastening element. Figure 3 Not shown in FIG.

[0166] In an example, the flange fastening structure is a v-shaped clamp which is Figure 3 Not shown in FIG.

[0167] As an advantage, reducing the heat transfer between the primary and secondary flanges by means of the supports prevents temperature-induced deformation of the axially facing flange sides 108 which would lead to leakage.

[0168] As an advantage, the secondary flange requires no additional installation procedures or flange fastening structures.

[0169] Figure 3 Also schematically shown is a cross section through an example of a dual coaxial conduit 200. The dual coaxial conduit 200 comprises a dual coaxial tube arrangement 202 having a primary outer tube 204 and a secondary inner tube 206, and at least one coupler 208 according to one of the foregoing examples and options. A circumferential portion 210 of one end of the primary outer tube 204 is sealingly attached to a primary flange 212 of the coupler 208. A circumferential portion 214 of one end of the secondary inner tube 206 is sealingly attached to a secondary flange 216 of the coupler 208. An annular support structure 217 comprises an axially oriented channel 218 between an inner side of the primary outer tube 204 and an outer side of the secondary inner tube 206.

[0170] In an example, the primary outer tube 204 encloses an annular lumen 219 in a gap between the outer tube wall of the secondary inner tube 206 and the inner tube wall of the primary outer tube 204. The annular lumen 219 may be used to receive a fluid or a vacuum.

[0171] In an example, the annular lumen 219 may be used to receive an inert gas, which is Figure 3 Not shown in FIG.

[0172] In the example, the annular lumen 219 is configured to maintain a vacuum. Figure 3 Not shown in FIG.

[0173] In an example, the annular lumen 219 is configured to hold an inert gas under pressure. Figure 3 Not shown in FIG.

[0174] In the example, the annular lumen 219 of the dual coaxial catheter 200 holds the fluid. The other coupler of the other dual coaxial catheter abuts the coupler 208 of the dual coaxial catheter 200, which has axially oriented channels 218 located between the inner side of the primary outer tube 204 and the outer side of the secondary inner tube 206. Having these axially oriented channels 218 allows the fluid to flow between the annular lumen 219 of the dual coaxial catheter 200 and the annular lumen of the other dual coaxial catheter 200 beyond their Figure 3 By means of these axially oriented channels 218, an extended annular lumen 219 is provided.

[0175] In an example, a circumferential portion 210 of one end of the primary outer tube 204 and / or a circumferential portion 214 of one end of the secondary inner tube 206 are welded to the primary flange 212 and the secondary flange 216 of the coupling 208 , respectively.

[0176] In the example, a circumferential portion 210 of one end of the primary outer tube 204 and / or a circumferential portion 214 of one end of the secondary inner tube 206 are formed as a primary flange 212 and a secondary flange 216 of the coupling 208 , respectively.

[0177] In the example, the dual coaxial conduit 200 can be considered as a pre-assembled component consisting of two double-walled tube flanges and inner and outer tubes.

[0178] Figure 4 Examples of dual coaxial catheters 200 and dual coaxial tube systems 300 are schematically shown.

[0179] exist Figure 4 In the example of , a second coupler 220 according to the aforementioned examples and options is provided, which is attached to the other end of the dual coaxial tube arrangement 202 of the dual coaxial conduit 200 .

[0180] As an advantage, the dual coaxial catheter allows fluid in the annular lumen to flow beyond the flange into the other annular lumen of another dual coaxial catheter abutting the dual coaxial catheter.

[0181] As another advantage, hydrogen leakage at the primary flange is prevented by the pressurized gas in the annular lumen and the axially oriented passage 218 .

[0182] As an advantage, a leak-proof connection is provided between the two dual coaxial tube arrangements, since temperature-induced deformation of the abutting axially facing flange sides of the two dual coaxial tube arrangements is prevented.

[0183] exist Figure 4 In the example of , the dual coaxial pipe system 300 includes at least two dual coaxial conduits 302a, 302b according to the aforementioned examples and options and at least one fastening structure 304. The fastening structure 304 provides a clamping force by pressing adjacent primary flanges 305 of at least two dual coaxial conduits against each other.

[0184] In an example, the material of the dual coaxial tube system 300 includes a specific material that is not susceptible to hydrogen embrittlement.

[0185] In an example, the material of the dual concentric tube system 300 includes a specific austenitic steel that is not susceptible to hydrogen embrittlement.

[0186] In an example, the material of the two dual coaxial conduits comprises a specific austenitic steel that is not susceptible to hydrogen embrittlement.

[0187] In an example, the material of the fastening structure 304 comprises a specific austenitic steel that is not susceptible to hydrogen embrittlement.

[0188] Figure 5 An example of an aircraft 400 including a dual coaxial pipe system 406 is schematically shown. The aircraft 400 includes a fluid reservoir 402 storing a fluid, at least one load 404 configured to be operated by the fluid, and the dual coaxial pipe system 406 of the aforementioned example. The dual coaxial pipe system 406 supplies the fluid from the fluid reservoir 402 to the at least one load.

[0189] In the example, the exhaust type dual coaxial tube system 406a allows the exhaust of cryogenic fluid from the fluid reservoir 402, such as Figure 5 shown.

[0190] In an example, the load includes a fuel cell.

[0191] In an example, the fluid reservoir 402 includes cryogenic hydrogen and is configured to store cryogenic hydrogen.

[0192] In an example, the fluid reservoir 402 is configured to supply cryogenic hydrogen to the dual coaxial tube system 406 .

[0193] As an advantage, the dual coaxial tube system supports the installation of a hydrogen system on board an aircraft.

[0194] As an advantage, the dual coaxial duct system supports installation of a hydrogen exhaust system on board an aircraft.

[0195] Figure 6 The basic steps of an example of a method 500 for providing a support 10 for a coaxial flange 12 of a dual coaxial coupling 14 are shown. The method 500 includes the following steps:

[0196] - in a first step 502, an annular support structure 16 is provided,

[0197] - in a second step 504 , providing at the annular support structure 16 a primary mounting area 18 for attaching a primary flange 20 connected to a primary outer pipe 22 ,

[0198] - In a third step 506, a secondary mounting area 24 is provided at the annular support structure 16 for attaching a secondary flange 26, the secondary flange 26 being used to connect a secondary inner tube 28 coaxial with the primary outer tube 22. The primary mounting area 18 and the secondary mounting area 24 are spaced apart from each other in the radial direction for centering the primary flange 20 and the secondary flange 26 in a radially spaced coaxial manner. The primary mounting area 18 provides an outer peripheral connection area 34 having at least three mounting points 36 for attaching the primary flange 20. The secondary mounting area 24 provides an inner peripheral connection area 38 having at least three mounting points 40 for attaching the secondary flange 26. The thermal path within the annular support structure 16 between a mounting point 44 of the primary mounting area 18 and an adjacent and spaced apart mounting point 46 of the secondary mounting area 24 is longer than the distance between the two mounting points.

[0199] In an example of this method, an existing dual coaxial coupling 14 is retrofitted with an annular support structure 16 .

[0200] In the example, at least three mounting points 36 , 40 are provided as welded, brazed, adhesively bonded connections between the outer peripheral connection area 34 and the primary flange 20 and between the inner peripheral connection area 38 and the secondary flange 26 .

[0201] In the example, at least three mounting points 36, 40 are interconnected to produce a single mounting point.

[0202] In the example, at least three mounting points 36 , 40 are provided by a single weld line.

[0203] In the example, at least three mounting points 36 , 40 are provided by manufacturing the annular support structure 16 having the primary flange 20 and the secondary flange 26 from a single piece.

[0204] In an example, at least three mounting points 36 , 40 are provided by manufacturing the annular support structure 16 having the primary flange 20 and the secondary flange 26 from a single piece by casting, CNC machining, or additive manufacturing.

[0205] In the example, at least three mounting points 36 , 40 represent a material-locked connection between the annular support structure 16 and the primary flange 20 and the secondary flange 26 .

[0206] It must be noted that embodiments of the present invention are described with reference to different subject matters. In particular, some embodiments are described with reference to method type claims, while other embodiments are described with reference to device type claims. However, it will be understood by those skilled in the art from the above description and the following description that, unless otherwise indicated, any combination of features related to different subject matters, in addition to any combination of features belonging to one type of subject matter, is also considered to be disclosed by the present application. However, all features can be combined to provide synergistic effects that exceed the simple superposition of features.

[0207] Although the present invention has been illustrated and described in detail in the drawings and the foregoing description, such illustration and description are to be considered illustrative or exemplary rather than restrictive. The present invention is not limited to the disclosed embodiments. Other variations of the disclosed embodiments may be understood and effected by those skilled in the art in practicing the claimed invention by studying the drawings, the disclosure, and the dependent claims.

[0208] In the claims, the word "comprising" does not exclude other elements or steps, and the indefinite article "a" or "an" does not exclude a plurality. A single processor or other unit may fulfill the functions of several items recited in the claims. The mere fact that certain measures are recited in mutually different dependent claims does not indicate that a combination of these measures cannot be used to advantage. Any reference signs in the claims should not be construed as limiting the scope.

Claims

1. A support (10) for a coaxial flange (12) of a dual coaxial connector (14), the support (10) comprising an annular support structure (16); in, The annular support structure provides the following: a primary mounting area (18) for attaching a primary flange (20) for connecting to a primary outer tube (22); a secondary mounting area (24) for attaching a secondary flange (26) for connecting to a secondary inner tube (28) coaxial with the primary outer tube; wherein the primary mounting area and the secondary mounting area are spaced apart from each other in a radial direction for centering the primary flange and the secondary flange in a radially spaced coaxial manner; wherein the primary mounting area provides a peripheral connection region (34) having at least three mounting points (36) for attaching the primary flange; wherein the secondary mounting area provides an inner peripheral connection region (38) having at least three mounting points (40) for attaching the secondary flange; and A thermal path within the annular support structure between a mounting point (44) at the primary mounting area and an adjacent and spaced-apart mounting point (46) at the secondary mounting area is longer than a distance between the two mounting points.

2. The support member according to claim 1, wherein: The primary mounting area is configured as a circumferential primary mounting area (48); and Wherein, the secondary installation area is configured as a circumferential secondary installation area (50).

3. The support member according to claim 1 or 2, wherein: The primary mounting area and the secondary mounting area are provided by a plurality of at least three brackets (52), each bracket providing a mounting point for the primary mounting area and a mounting point for the secondary mounting area; and A circumferential connector (54) is provided, which provides a common mounting portion for the plurality of at least three brackets (52).

4. A support according to claim 1, 2 or 3, wherein: For axially oriented fluid flow, the annular support structure includes an axially oriented passage (56) between the circumferential primary mounting area and the circumferential secondary mounting area.

5. Support according to one of the preceding claims, wherein The annular support structure can be preloaded by a force acting between a mounting point of the primary mounting area and a mounting point of the secondary mounting area.

6. Support according to one of the preceding claims, wherein The annular support structure comprises a U-shaped profile (58) in an axial cross-section of the annular support structure; wherein the U-shaped profile is open toward a mounting point of the primary mounting area and a mounting point of the secondary mounting area; and The U-shaped profile provides stiffness in the axial direction and the radial direction between the mounting point of the primary mounting area and the mounting point of the secondary mounting area.

7. Support according to one of the preceding claims, wherein The leg portion (60) of the U-shaped profile includes a sleeve-like structure (62); and The top (64) of the U-shaped profile includes a ring-shaped structure (66).

8. A connector (100), comprising: A primary flange (102); A secondary flange (104); A support (106) according to one of the preceding claims; wherein the support rigidly connects the primary flange and the secondary flange, and the support aligns the secondary flange and the primary flange in a radially spaced coaxial manner; and The primary flange and the secondary flange are respectively provided with axially facing flange sides (108), and the axially facing flange sides (108) are used to tightly and sealingly connect the connector to the corresponding counterpart.

9. The coupling according to claim 8, wherein: said axially facing flange side of said primary flange being arranged for tight sealing abutment to an axially facing flange side of a primary flange of an adjoining coupling; and Therein, the axially facing flange side of the secondary flange is arranged for tightly sealing abutment to the axially facing flange side of the secondary flange of the adjacent coupling.

10. The coupling according to claim 8 or 9, wherein: The primary flange comprises at least one fastening area (110) for receiving an axial clamping force of a flange fastening structure for pressing the axially facing flange side of the primary flange to an abutting axially facing primary flange side of the adjacent coupling; and Wherein, the annular support structure (111) is configured to transmit the axial clamping force to the secondary flange for pressing the axially facing flange side of the secondary flange to the abutting axially facing secondary flange side of the adjacent connector.

11. A dual coaxial catheter (200), comprising: A dual coaxial pipe arrangement structure (202), wherein the dual coaxial pipe arrangement structure (202) comprises: a primary outer tube (204); and A secondary inner tube (206); and at least one coupling (208) according to claim 8, 9 or 10; wherein a circumferential portion (210) of one end of the primary outer tube is sealingly attached to a primary flange (212) of the coupling; wherein a circumferential portion (214) of one end of the secondary inner tube is sealingly attached to a secondary flange (216) of the coupler; and Therein, the annular support structure (217) includes an axially oriented channel (218) located between the inner side of the primary outer tube and the outer side of the secondary inner tube.

12. The dual coaxial catheter according to claim 11, wherein: A second coupling (220) according to claim 8, 9 or 10 is provided, attached to the other end of the dual coaxial tube arrangement.

13. A dual coaxial pipe system (300), comprising: At least two dual coaxial conduits (302a, 302b) according to claim 11 or 12; as well as at least two fastening structures (304); The fastening structure provides a clamping force by pressing adjacent primary flanges (305) of at least two of the dual coaxial conduits against each other.

14. An aircraft (400), comprising: a fluid reservoir (402), wherein the fluid reservoir (402) stores a fluid; at least one load (404) configured to operate with the fluid; as well as The dual coaxial tube system (406) according to claim 13; Wherein, the dual coaxial pipe system supplies the fluid from the fluid reservoir to the at least one load.

15. A method for providing a support for a coaxial flange of a dual coaxial connector, the method comprising the steps of: providing an annular support structure; providing a primary mounting area at the annular support structure for attaching a primary flange, the primary flange being used to connect to a primary outer tube; providing a secondary mounting area at the annular support structure for attaching a secondary flange for connecting a secondary inner tube coaxial with the primary outer tube; wherein the primary mounting area and the secondary mounting area are spaced apart from each other in a radial direction for centering the primary flange and the secondary flange in a radially spaced coaxial manner; wherein the primary mounting area provides a peripheral connection region having at least three mounting points for attaching the primary flange; wherein the secondary mounting area provides an inner peripheral connection region having at least three mounting points for attaching the secondary flange; and Wherein a thermal path within the annular support structure between a mounting point of the primary mounting area and an adjacent and spaced-apart mounting point of the secondary mounting area is longer than a distance between the two mounting points.

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