Thermal barrier and turbine casing assembly

Abstract

The application provides a heat insulation plate and a turbine casing assembly, the heat insulation plate comprises at least two spliced sector plates, the spliced sector plates are elastically abutted to the side wall surface of the turbine casing towards the intermediate casing and are located between the turbine casing and the intermediate casing; wherein each sector plate is provided with at least one supporting protrusion along the turbine casing axial direction and the radial direction, the supporting protrusion is abutted to the inner wall surface of the turbine casing towards the intermediate casing and forms a heat insulation space between the turbine casing. The heat insulation plate is composed of at least two spliced sector plates, so that the assembly pre-tightening force can be realized, the parts are prevented from loosening and affecting other parts during the assembly process, and the supporting protrusion provided on the sector plate along the turbine casing axial direction and the radial direction can form a heat insulation space between the sector plate and the turbine casing, the contact area between the sector plate and the turbine casing is reduced, the thermal resistance is improved, and the heat insulation effect is improved.

Description

Technical Field

[0001] This invention relates to the field of aero-engine technology, and more specifically to a heat shield and turbine casing assembly. Background Technology

[0002] The turbine casing in an aircraft engine is located in a high-temperature zone. To reduce the casing temperature and improve its service life, heat insulation plates or thermal barrier coatings are designed on the inner wall of the casing. If space permits, heat insulation plates with a honeycomb structure are used to reduce heat radiation from internal components to the casing.

[0003] In reality, the limited space in the engine makes it difficult to design a thicker heat insulation structure. Furthermore, the existing heat insulation panels have a very complex assembly process, and there is a risk of parts coming loose and interfering with other parts during assembly.

[0004] Based on this, the inventors of this application propose a heat insulation plate and a turbine casing assembly in order to solve the above-mentioned technical problems. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to overcome the defects of poor assemblability and poor heat insulation effect of the heat insulation structure in the prior art, and to provide a heat insulation plate and turbine casing assembly.

[0006] The present invention solves the above-mentioned technical problems through the following technical solution:

[0007] This invention provides a heat insulation board, characterized in that it comprises:

[0008] At least two spliced ​​sector plates, the spliced ​​sector plates elastically abutting against the side wall of the turbine casing facing the intermediate casing and located between the turbine casing and the intermediate casing; wherein,

[0009] Each of the sector plates is provided with at least one support protrusion along the axial and radial directions of the turbine casing. The support protrusion abuts against the inner wall surface of the turbine casing facing the intermediate casing and forms a heat insulation space between the turbine casing and the turbine casing.

[0010] According to one embodiment of the present invention, one of the opposite ends of the sector plate is provided with at least one bent buckle, and the other end is provided with at least one slot;

[0011] The adjacent sector plates are connected by being secured in the slot by the bending buckle.

[0012] According to one embodiment of the present invention, the number of bending buckles and slots at each of the opposite ends of each of the sector plates is at least three, and the at least three bending buckles and at least three slots are arranged at intervals along the length extension direction of the sector plate.

[0013] According to one embodiment of the present invention, the engagement depth between the bent buckle and the slot is adjustable.

[0014] According to one embodiment of the present invention, the sector plate includes a continuous first plate, a second plate, and a third plate, wherein the second plate is located between the first plate and the third plate;

[0015] The second plate is set at an angle to the first plate and the third plate, and the first plate and the third plate are set parallel to each other;

[0016] The support protrusions are provided on the first plate and the second plate.

[0017] According to one embodiment of the present invention, the support protrusion includes a radial protrusion and an axial protrusion;

[0018] The radial protrusion is provided on the first plate, and the axial protrusion is provided on the second plate.

[0019] According to one embodiment of the present invention, the sector plate is installed in a groove in the turbine casing;

[0020] The first plate is parallel to and spaced apart from the bottom of the groove, and the radial protrusion abuts against the bottom of the groove. The second plate is parallel to and spaced apart from the wall of the groove, and the axial protrusion abuts against the wall of the groove.

[0021] According to one embodiment of the present invention, the thickness of the sector plate is no more than 1 mm.

[0022] The present invention also provides a turbine casing assembly, characterized in that it comprises:

[0023] A turbine casing and an intermediate casing, wherein the turbine casing has a groove on the side facing the intermediate casing;

[0024] The heat insulation plate, as described above, is disposed within the groove.

[0025] According to one embodiment of the present invention, the intermediate casing is provided with a support boss on the side facing the turbine casing, and one end of the support boss abuts against the heat insulation plate.

[0026] The positive and progressive effects of this invention are as follows:

[0027] The heat insulation board of the present invention is composed of at least two spliced ​​sector-shaped boards, which can achieve pre-tightening force during assembly and prevent parts from loosening and interfering with other parts during assembly.

[0028] Furthermore, by setting support protrusions on the sector plate along the axial and radial directions of the turbine casing, a heat insulation space can be formed between the sector plate and the turbine casing, reducing the contact area between the sector plate and the turbine casing, increasing thermal resistance, and improving the heat insulation effect. Attached Figure Description

[0029] The above and other features, properties and advantages of the present invention will become more apparent from the following description taken in conjunction with the accompanying drawings and embodiments, wherein:

[0030] Figure 1 This is a schematic diagram of the structure of the sector-shaped plate of the present invention;

[0031] Figure 2 for Figure 1 A magnified structural diagram of position A in the middle;

[0032] Figure 3 for Figure 1 A cross-sectional view at position BB in the middle;

[0033] Figure 4 for Figure 1 A schematic diagram of the structure at position C in the middle;

[0034] Figure 5 This is a schematic diagram illustrating the engagement of the bending buckle and the slot when adjacent sector plates are spliced ​​together according to the present invention.

[0035] Figure 6 This is a schematic diagram of the structure of the heat insulation board of the present invention in its installed state.

[0036] 1. Fan-shaped plate; 11. Bending buckle; 12. Slot; 13. First plate; 14. Second plate; 15. Third plate;

[0037] 2. Turbine casing; 21. Groove;

[0038] 3. Intermediate housing; 31. Support boss;

[0039] 4. Supporting protrusion; 41. Axial protrusion; 42. Radial protrusion;

[0040] 5. Insulated space. Detailed Implementation

[0041] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are merely some examples or embodiments of this application. For those skilled in the art, these drawings can be applied to other similar scenarios without creative effort. Unless obvious from the context or otherwise specified, the same reference numerals in the drawings represent the same structures or operations.

[0042] As indicated in this application and claims, unless the context clearly indicates otherwise, the words "a," "an," "an," and / or "the" are not specifically singular and may include plural forms. Generally speaking, the terms "comprising" and "including" only indicate the inclusion of explicitly identified steps and elements, which do not constitute an exclusive list, and the method or apparatus may also include other steps or elements.

[0043] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this application. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0044] Please refer to Figures 1 to 6 This invention proposes a heat insulation plate comprising at least two spliced ​​sector-shaped plates 1. The spliced ​​sector-shaped plates 1 elastically abut against the side wall of the turbine casing 2 facing the intermediate casing 3 and are located between the turbine casing 2 and the intermediate casing 3. Each sector-shaped plate 1 is provided with at least one supporting protrusion 4 along the axial and radial directions of the turbine casing 2. The supporting protrusion 4 abuts against the inner wall of the turbine casing 2 facing the intermediate casing 3 and forms a heat insulation space 5 between the turbine casing 2 and the turbine casing 2.

[0045] It is understood that the heat insulation plate of the present invention is composed of at least two sector plates 1 spliced ​​together. Thus, different numbers of sector plates 1 can be selected for splicing according to the diameter of the installation space. The spliced ​​sector plates 1 generate circumferential extrusion force, so that the heat insulation plate of the whole ring can be tightly attached to the inner wall of the turbine casing 2. Thus, no assembly interference will occur due to the heat insulation plate loosening during the assembly of other parts.

[0046] On the one hand, it simplifies the installation process of the insulation board, making the installation simpler and more convenient, and avoiding assembly interference with other parts; on the other hand, the insulation board is formed by splicing, which allows the circumferential compressive force of the insulation board to be adjusted according to actual needs, thus adapting to installation spaces of different sizes.

[0047] It should be noted that, please refer to Figure 1 This invention is illustrated using the example of four sector-shaped plates 1 spliced ​​together. Based on this, Figure 1The sector plate 1 is a sector segment with a 90-degree angle. In some other embodiments, the number of sector plates 1 can be two, three, five, etc., and the specific number can be adjusted according to actual needs, which is not limited here.

[0048] Please refer to Figure 2 , Figure 4 as well as Figure 5 One of the opposite ends of the sector plate 1 is provided with at least one bending buckle 11, and the other is provided with at least one slot 12; adjacent sector plates 1 are spliced ​​by being snapped into the slot 12 by the bending buckle 11.

[0049] It can be seen that the slot 12 is provided along the length extension direction of the sector plate 1, and the mating depth between the bent buckle 11 and the slot 12 is adjustable. It should be noted that the length extension direction of the sector plate 1 is an arc-shaped extension direction.

[0050] Therefore, by adjusting the mating depth between the bending buckle 11 and the slot 12, the circumferential preload of the heat insulation board can be adjusted.

[0051] That is, the circumferential preload formed after the sector plate 1 is spliced ​​can be adjusted, so that the circumferential compressive force between the sector plate 1 and the turbine casing 2 can be adjusted during the assembly of the sector plate 1.

[0052] Please continue to refer to Figure 4 Each sector plate 1 has at least three bent buckles 11 and three slots 12 at its opposite ends, and the at least three bent buckles 11 and at least three slots 12 are arranged at intervals along the length extension direction of the sector plate 1.

[0053] This explanation uses four card slots 12 as an example, but the number of card slots 12 is not limited.

[0054] That is, each sector plate 1 is provided with multiple rows of tongue-shaped slots 12 and multiple rows of bent buckles 11, and the bent buckles 11 and slots 12 are arranged alternately along the length extension direction of the sector plate 1, which can improve the connection stability between adjacent sector plates 1.

[0055] For example, after adjacent sector plates 1 are spliced ​​together, due to the cooperation of multiple rows of tongue-shaped slots 12 and multiple rows of bent buckles 11, there are at least two rows of limiting points along the radial direction of sector plate 1. When sector plate 1 is subjected to external force, it is more difficult to separate along the radial direction, thereby improving the connection stability between adjacent sector plates 1.

[0056] Please refer to Figure 3 and Figure 6The sector plate 1 includes a continuous first plate 13, a second plate 14, and a third plate 15. The second plate 14 is located between the first plate 13 and the third plate 15. The second plate 14 is set at an angle to the first plate 13 and the third plate 15, respectively. The first plate 13 and the third plate 15 are set in parallel. The support protrusion 4 is provided on the first plate 13 and the second plate 14.

[0057] It is known that the heat insulation plate is installed in the groove 21 of the turbine casing 2. The groove 21 has a bottom and a wall. In order to improve the thermal resistance between the heat insulation plate and the turbine casing 2, the heat insulation plate needs to be spaced apart from the bottom and the wall. The heat insulation plate has a compressive force in the circumference. Therefore, support protrusions 4 are provided on the first plate 13 and the second plate 14 of the heat insulation plate. This reduces the contact area between the heat insulation plate and the turbine casing 2 and forms a heat insulation gap between the heat insulation plate and the turbine casing 2, thereby improving the thermal resistance.

[0058] Specifically, the support protrusion 4 includes a radial protrusion 42 and an axial protrusion 41; the radial protrusion 42 is disposed on the first plate 13, and the axial protrusion 41 is disposed on the second plate 14.

[0059] It can be seen that the radial protrusion 42 can be annular, for example, the radial protrusion 42 is arranged in a ring around the circumference of the insulation plate. Alternatively, the radial protrusion 42 can also be multiple protrusion structures, with multiple protrusions evenly spaced around the circumference of the insulation plate. The specific number can be adjusted according to actual needs and is not limited here.

[0060] Similarly, the axial protrusion 41 can also be annular, for example, the axial protrusion 41 is arranged in a ring around the circumference of the insulation plate.

[0061] Alternatively, the axial protrusion 41 can also be a multiple protrusion structure, with multiple protrusions evenly spaced around the circumference of the insulation board. The specific number can be adjusted according to actual needs and is not limited here.

[0062] The radial protrusion 42 and the axial protrusion 41 can serve as constraint points between the heat insulation plate and the turbine casing 2 in the axial and radial directions, supporting the heat insulation plate and forming a heat insulation space 5 between the heat insulation plate and the turbine casing 2.

[0063] It should be noted that the shapes of the axial protrusion 41 and the radial protrusion 42 can be conical, frustum-shaped, rectangular, etc., and are not limited here.

[0064] Furthermore, the height and dimensions of the axial protrusion 41 and the radial protrusion 42 can be the same or different, depending on actual needs, and are not limited here.

[0065] Furthermore, the axial protrusion 41 and the radial protrusion 42 can be integrally formed with the sector plate 1, or they can be provided on the sector plate 1 by welding, bonding or other methods. Both methods are acceptable and are not limited here.

[0066] Furthermore, the first plate 13 is arranged parallel to the bottom of the groove 21 and the radial protrusion 42 abuts against the bottom of the groove 21, and the second plate 14 is arranged parallel to the wall of the groove 21 and the axial protrusion 41 abuts against the wall of the groove 21.

[0067] That is, when the heat insulation plate is installed in the groove 21 of the turbine casing 2, the radial protrusion 42 and the axial protrusion 41 can ensure assembly constraints, thereby reducing the contact area between the heat insulation plate and the turbine casing 2 and creating a heat insulation space 5, thus improving the heat insulation effect.

[0068] In one embodiment, the sector plate 1 is formed from sheet metal. To reduce the difficulty of sheet metal processing and post-sheet metal stress, the thickness of the sector plate 1 is no more than 1 mm.

[0069] Furthermore, the heat insulation board is made of high-temperature alloy material, such as GH4169, GH5188, and GH3536, depending on the ambient temperature of the environment. No specific limit is imposed here.

[0070] Please continue to refer to Figure 6 The present invention also proposes a turbine casing assembly, including a turbine casing 2, an intermediate casing 3 and the aforementioned heat insulation plate, wherein the turbine casing 2 is provided with a groove 21 on the side facing the intermediate casing 3, and the heat insulation plate is disposed in the groove 21.

[0071] It should be noted that the preload of the heat insulation plate can be adjusted by adjusting the position between the bending buckle 11 and the slot 12. However, when the engine is running, the casing vibrates greatly, and excessive preload can easily cause fatigue cracks in the slot 12, which in turn causes the sector plate 1 to detach.

[0072] Based on this, the present invention provides a support boss 31 on the intermediate casing 3 at the rear end of the heat insulation plate. The support boss 31 abuts against the rear end of the heat insulation plate, increasing the limiting constraint of the heat insulation plate and reducing the assembly stress of the slot 12.

[0073] The following describes the installation process for the heat insulation board:

[0074] First, place the sector plates 1 one by one into the groove 21 of the turbine casing 2. Then, adjust the engagement depth between the bending buckle 11 and the slot 12 between adjacent sector plates 1 so that the heat insulation plate is tightly fitted to the inner wall of the turbine casing 2 in the circumferential direction. During the adjustment process, it is necessary to control the circumferential tightening force to prevent excessive axial stress after thermal expansion.

[0075] Then assemble the intermediate casing 3, and make the support protrusion 4 press against the rear end of the heat insulation plate to complete the assembly.

[0076] In summary, the heat insulation board proposed in this invention is composed of at least two spliced ​​sector-shaped plates 1, which can achieve pre-tightening force during assembly and prevent parts from loosening and interfering with other parts during assembly.

[0077] Furthermore, by providing support protrusions 4 along the axial and radial directions of the turbine casing 2 on the sector plate 1, a heat insulation space 5 can be formed between the sector plate 1 and the turbine casing 2, reducing the contact area between the sector plate 1 and the turbine casing 2, increasing thermal resistance, and improving the heat insulation effect.

[0078] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the technical terms such as "installation", "connection", "joining", and "fixing" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can also refer to mechanical connections. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0079] This application uses specific terms to describe embodiments of the application. Terms such as "an embodiment," "one embodiment," and / or "some embodiments" refer to a particular feature, structure, or characteristic associated with at least one embodiment of the application. Therefore, it should be emphasized and noted that references to "an embodiment," "one embodiment," or "an alternative embodiment" in different locations throughout this specification do not necessarily refer to the same embodiment. Furthermore, certain features, structures, or characteristics in one or more embodiments of the application can be appropriately combined.

[0080] While the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the invention. Any variations and modifications can be made by those skilled in the art without departing from the spirit and scope of the invention. Therefore, any modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention, without departing from the scope of the invention, fall within the protection scope defined by the claims of the present invention.

Claims

1. A heat insulation board, characterized in that, include: At least two spliced ​​sector plates, the spliced ​​sector plates elastically abutting against the side wall of the turbine casing facing the intermediate casing and located between the turbine casing and the intermediate casing; wherein, Each of the sector plates is provided with at least one support protrusion along the axial and radial directions of the turbine casing. The support protrusion abuts against the inner wall surface of the turbine casing facing the intermediate casing and forms a heat insulation space between the turbine casing and the turbine casing.

2. The heat insulation board according to claim 1, characterized in that, One of the opposite ends of the fan-shaped plate is provided with at least one bent buckle, and the other end is provided with at least one slot. The adjacent sector plates are connected by being secured in the slot by the bending buckle.

3. The heat insulation board according to claim 2, characterized in that, The number of bending buckles and slots at each of the opposite ends of each sector plate is at least three, and the at least three bending buckles and at least three slots are arranged at intervals along the length extension direction of the sector plate.

4. The heat insulation board according to claim 2, characterized in that, The engagement depth between the bent buckle and the slot is adjustable.

5. The heat insulation board according to claim 1, characterized in that, The sector-shaped plate includes a continuous first plate, a second plate, and a third plate, with the second plate located between the first plate and the third plate; The second plate is set at an angle to the first plate and the third plate, and the first plate and the third plate are set parallel to each other; The support protrusions are provided on the first plate and the second plate.

6. The heat insulation board according to claim 5, characterized in that, The support protrusion includes radial protrusions and axial protrusions; The radial protrusion is provided on the first plate, and the axial protrusion is provided on the second plate.

7. The heat insulation board according to claim 6, characterized in that, The sector plate is installed in the groove of the turbine casing; The first plate is parallel to and spaced apart from the bottom of the groove, and the radial protrusion abuts against the bottom of the groove. The second plate is parallel to and spaced apart from the wall of the groove, and the axial protrusion abuts against the wall of the groove.

8. The heat insulation board according to claim 1, characterized in that, The thickness of the sector plate is no more than 1 mm.

9. A turbine casing assembly, characterized in that, include: A turbine casing and an intermediate casing, wherein the turbine casing has a groove on the side facing the intermediate casing; The heat insulation plate as described in any one of claims 1-8 is disposed within the groove.

10. The turbine casing assembly according to claim 9, characterized in that, The intermediate casing has a support boss on the side facing the turbine casing, and one end of the support boss abuts against the heat insulation plate.

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