Housing and Aeroengine

Abstract

The present invention relates to a casing and an aeroengine. The casing includes an inner casing (1), an outer casing (2), a first insert (3) and a second insert (4). The inner casing (1) is provided with a first mounting hole (11), and the outer casing (2) is provided with a second mounting hole (21). The first insert (3) is inserted into the first mounting hole (11), and the second insert (4) is inserted into the second mounting hole (21). A cavity is provided inside the second insert (4). One end of the first insert (3) close to the outer casing (2) is located in the cavity and can slide in the cavity. The aeroengine includes the casing. The casing of the present invention can adapt to the distance change in the radial direction between the inner casing and the outer casing through the relative movement between the first insert and the second insert, improving the assembly stability and reliability.

Description

Technical Field

[0001] The present invention relates to the technical field of aero-engine structure design and assembly, and particularly relates to a casing and an aero-engine. Background Art

[0002] Currently, in domestic civil engines, the tubular structures passing through and out of the double-layer casing all adopt the method of ensuring coaxiality by manufacturing and processing to ensure the assembly performance. As Figure 1 shown, the insert 30 needs to pass through or out of the inner casing 10 and the outer casing 20. The diameter φ1 of the upper part of the insert 30 is equal to the diameter φ2 of the lower part. The coaxiality of the mounting holes on the inner casing 10 and the outer casing 20 is ensured by the manufacturing coaxiality of the parts, which poses high requirements for processing and the corresponding processing cost will also be very high.

[0003] For the current assembly method, not only is it affected by the coaxiality of the processed parts, but the assembled structure is also affected by the radial and axial deformations caused by different working conditions. Moreover, the sealing performance of the inner layer structure is relatively poor and gas leakage is likely to occur.

[0004] It should be noted that the information disclosed in the background art part of the present invention is only intended to enhance the overall understanding of the present invention and should not be regarded as an admission or any form of implication that this information constitutes the prior art known to those skilled in the art. Summary of the Invention

[0005] An embodiment of the present invention provides a casing and an aero-engine, which can improve the sealing performance after the casing is assembled.

[0006] According to one aspect of the present invention, a casing is provided, including:

[0007] An inner casing provided with a first mounting hole;

[0008] An outer casing provided with a second mounting hole;

[0009] A first insert inserted into the first mounting hole; and

[0010] A second insert inserted into the second mounting hole. A cavity is provided inside the second insert, and one end of the first insert close to the outer casing is located in the cavity and can slide in the cavity.

[0011] In some embodiments, the casing further includes an elastic member disposed in the cavity, and the elastic member abuts against one end of the first insert close to the outer casing.

[0012] In some embodiments, the second insert includes an insert body and a first cover plate. The insert body is inserted into the second mounting hole, a cavity is disposed inside the insert body, and the first cover plate is connected to one end of the insert body away from the inner casing and is used to seal the cavity.

[0013] In some embodiments, the casing further includes a second cover plate. The second cover plate is connected to the side of the outer casing away from the inner casing and is used to limit the radial movement of the second insert along the outer casing.

[0014] In some embodiments, the second insert includes a first insertion portion inserted into the second mounting hole, and there is a first gap between the outer wall of the first insertion portion and the hole wall of the second mounting hole.

[0015] In some embodiments, a groove is provided on the side of the outer casing away from the inner casing. The second insert includes a first end connected to the first insertion portion. The first end is used to seal the second mounting hole. The first end is located in the groove, and there is a second gap between the outer wall of the first end and the groove wall.

[0016] In some embodiments, the size of the second gap is greater than or equal to the size of the first gap.

[0017] In some embodiments, the first insert includes a first insertion segment and a second insertion segment connected to each other. The first insertion segment is inserted into the first mounting hole, and the second insertion segment is inserted into the cavity.

[0018] In some embodiments, the first insertion segment includes a second insertion portion and a second end connected to each other. The second insertion portion is inserted into the first mounting hole, and the second end is located on the side of the inner casing close to the outer casing and is used to seal the first mounting hole.

[0019] In some embodiments, there is a clearance fit between the first insert and the first mounting hole.

[0020] In some embodiments, the second insertion segment includes a connecting portion and a third end connected to each other. The connecting portion is connected to the first insertion segment, and the third end is slidably disposed in the cavity.

[0021] In some embodiments, a boss is provided in the cavity, and the boss is configured to prevent the third end from leaving the cavity.

[0022] According to another aspect of the present invention, there is provided an aeroengine including the above-mentioned casing.

[0023] Based on the above technical solution, in the embodiment of the present invention, the first insert inserted into the inner casing and the second insert inserted into the outer casing are set as two relatively independent components capable of relative movement. In this way, when the inner casing is deformed by heat, the relative movement between the first insert and the second insert can be used to adapt to the distance change in the radial direction between the inner casing and the outer casing, avoiding the influence of the deformation of the inner casing on the assembly and mating relationship between the first insert and the inner casing and between the second insert and the outer casing, and improving the stability and reliability of the assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention. In the drawings:

[0025] Figure 1 It is a schematic structural diagram of a casing in the related art.

[0026] Figure 2 It is a schematic structural diagram of an embodiment of the casing of the present invention.

[0027] Figure 3 It is a schematic internal structure diagram of an embodiment of the casing of the present invention.

[0028] Figure 4 It is a schematic diagram of the first assembly dimension of an embodiment of the casing of the present invention.

[0029] Figure 5 It is a schematic diagram of the second assembly dimension of an embodiment of the casing of the present invention.

[0030] In the figure:

[0031] 10. Inner casing; 20. Outer casing; 30. Insert

[0032] 1. Inner casing; 11. First mounting hole

[0033] 2. Outer casing; 21. Second mounting hole; 22. Groove

[0034] 3. First insert; 31. Second insertion part; 32. Second end; 33. Connecting part; 34. Third end

[0035] 4. Second insert; 41. First insertion part; 42. First end; 43. First cover plate; 44. First connecting piece; 45. Boss

[0036] 5. Second cover plate; 6. Second connecting piece; 7. Elastic part; 8. Connecting pipe. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0037] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts belong to the scope of protection of the present invention.

[0038] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "transverse", "longitudinal", "front", "rear", "left", "right", "upper", "lower", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as limiting the scope of protection of the present invention.

[0039] As Figure 2 shown, in some embodiments of the casing provided by the present invention, the casing includes an inner casing 1, an outer casing 2, a first insert 3 and a second insert 4. The inner casing 1 is provided with a first mounting hole 11, the outer casing 2 is provided with a second mounting hole 21, the first insert 3 is inserted into the first mounting hole 11, the second insert 4 is inserted into the second mounting hole 21, a cavity is provided inside the second insert 4, and one end of the first insert 3 close to the outer casing 2 is located in the cavity and can slide in the cavity.

[0040] In the above embodiments, the first insert 3 inserted into the inner casing 1 and the second insert 4 inserted into the outer casing 2 are set as two relatively independent components that can move relative to each other. In this way, when the inner casing 1 is deformed by heat, the relative movement between the first insert 3 and the second insert 4 can be used to adapt to the distance change between the inner casing 1 and the outer casing 2 in the radial direction (here, the "radial direction" takes the casing as the reference benchmark), avoiding the influence of the deformation of the inner casing 1 on the assembly and cooperation relationship between the first insert 3 and the inner casing 1 and between the second insert 4 and the outer casing 2, and improving the stability and reliability of the assembly; it can also avoid the gas leakage problem caused by the influence of the deformation of the inner casing 1 on the assembly and cooperation relationship, and reduce the aerodynamic loss.

[0041] In some embodiments, the casing further includes an elastic member 7 disposed in the cavity, and the elastic member 7 abuts against one end of the first insert 3 close to the outer casing 2.

[0042] By providing the elastic member 7, an elastic force can be applied to the first insert 3 to enable the first insert 3 to maintain its relative position with respect to the inner casing 1, and to avoid the first insert 3 moving away from the inner casing 1 and failing to achieve the preset sealing effect.

[0043] The elastic member 7 can be made of elastic materials such as springs or rubbers. For example, Figure 3 As shown, the elastic member 7 includes a spring. When installed in the cold state, the spring is in a natural elongation state; during the operation of the casing, when the inner casing 1 expands due to heat, the inner casing 1 moves radially towards the outer casing 2, the first insert 3 moves outwards with the inner casing 1, the spring is compressed, and the compressed spring generates an elastic force. This elastic force is applied to the first insert 3 to keep its original assembly relationship with the inner casing 1, preventing the first insert 3 from detaching from the inner casing 1. At the same time, it is beneficial to maintain the sealing effect on the inner casing 1 and prevent gas leakage in the core flow path.

[0044] In some embodiments, the second insert 4 includes an insert body and a first cover plate 43. The insert body is inserted into the second mounting hole 21, and a cavity is provided inside the insert body. The first cover plate 43 is connected to one end of the insert body away from the inner casing 1 and is used to close the cavity.

[0045] By providing the first cover plate 43, the end of the cavity away from the inner casing 1 can be closed to prevent gas leakage; at the same time, the elastic member 7 can be restricted between the first cover plate 43 and the first insert 3. When the inner casing 1 undergoes radial deformation, the elastic member 7 is compressed under the limiting action of the first cover plate 43, and the elastic force generated after compression can be applied to the first insert 3 to prevent the first insert 3 from detaching from the inner casing 1.

[0046] For example, Figure 3 As shown, the first cover plate 43 is in an inverted T shape, and the first cover plate 43 is connected to the insert body through a first connecting member 44. The first connecting member 44 can be a bolt or a pin, etc.

[0047] In some embodiments, the casing further includes a second cover plate 5. The second cover plate 5 is connected to the side of the outer casing 2 away from the inner casing 1 and is used to restrict the radial movement of the second insert 4 along the outer casing 2.

[0048] By providing the second cover plate 5, the radial movement of the second insert 4 can be restricted, maintaining relative stability in the radial direction, and the second mounting hole 21 can also be sealed to prevent gas leakage.

[0049] In some embodiments, the second insert 4 includes an insert body. The insert body includes a first insertion portion 41 inserted into the second mounting hole 21, and there is a first gap between the outer wall of the first insertion portion 41 and the hole wall of the second mounting hole 21.

[0050] The diameter of the second mounting hole 21 is larger than the diameter of the first insertion part 41. By setting the first gap, the mounting position of the second insert 4 can be made more flexible, and the assembly position of the second insert 4 can be appropriately adjusted as needed to ensure the coaxiality of the first insert 3 and the second insert 4. By setting the first gap, the second insert 4 has freedom in the radial direction (here, the "radial direction" is the direction perpendicular to the insertion direction of the second insert 4) during installation, so that when there are manufacturing deviations in both the first mounting hole 11 and the second mounting hole 21, the first insert 3 and the second insert 4 can still be coaxially installed.

[0051] In some embodiments, a groove 22 is provided on the side of the outer casing 2 away from the inner casing 1. The second insert 4 includes a first end 42 connected to the first insertion part 41. The first end 42 is used to seal the second mounting hole 21. The first end 42 is located in the groove 22, and there is a second gap between the outer wall of the first end 42 and the groove wall of the groove 22.

[0052] By providing the groove 22 and the diameter of the groove 22 being larger than the diameter of the first end 42, a second gap is formed between the outer wall of the first end 42 and the groove wall of the groove 22, which can cooperate with the first gap to provide support for the movement of the second insert 4 in the radial direction (here, the "radial direction" is the direction perpendicular to the insertion direction of the second insert 4), enabling the first insert 3 and the second insert 4 to be coaxially installed.

[0053] Two bosses are provided on the side of the outer casing 2 away from the inner casing 1. The groove 22 is formed between the two bosses. The second cover plate 5 is attached to the outer surface of the boss, and the second cover plate 5 is fixed to the two bosses by two second connectors 6. The second connectors 6 can be bolts or pins, etc.

[0054] The first cover plate 43 is attached to the first end 42, and the areas of the surfaces of the first cover plate 43 opposite to the first end 42 are equal, so that a gap is also formed between the first cover plate 43 and the groove wall of the groove 22.

[0055] In some embodiments, the size of the second gap is greater than or equal to the size of the first gap. This setting can ensure that the second insert 4 can have the maximum movement range with the aperture of the second mounting hole 21.

[0056] In some embodiments, the first insert 3 includes a first insertion section and a second insertion section connected to each other. The first insertion section is inserted into the first mounting hole 11, and the second insertion section is inserted into the cavity.

[0057] By providing two insertion sections, the two insertion sections can be respectively inserted into the first mounting hole 11 and the cavity, which is convenient for installation and avoids the situation where the first insert 3 cannot be installed into the cavity due to being an integral structure.

[0058] In some embodiments, the first insertion section includes a second insertion portion 31 and a second end head 32 connected to each other, the second insertion portion 31 is inserted into the first mounting hole 11, and the second end head 32 is located on a side of the inner casing 1 close to the outer casing 2 and is used to seal the first mounting hole 11.

[0059] By providing the second end head 32, the first mounting hole 11 can be sealed to prevent leakage of the gas in the inner channel. The diameter of the second end head 32 is larger than the diameter of the first mounting hole 11, which can prevent the second end head 32 from entering the first mounting hole 11 and achieve a better sealing effect for the first mounting hole 11. The elastic force generated by the elastic member 7 after being compressed acts on the first insert 3, and the second end head 32 can be pressed against the side of the inner casing 1 close to the outer casing 2, thereby achieving a better sealing effect.

[0060] A boss may be provided on one side of the inner casing 1 close to the outer casing 2, and the second end 32 is pressed against the boss. The surface where the second end 32 and the boss contact each other has a high degree of flatness to ensure the sealing performance after the second end 32 and the boss are fitted together.

[0061] In some embodiments, there is a clearance fit between the first insert 3 and the first mounting hole 11. Since the second end 32 is provided, the first mounting hole 11 can be sealed, so that the first insert 3 and the first mounting hole 11 can be provided with a clearance fit, so that the first insert 3 can be inserted into or removed from the first mounting hole 11 more smoothly, improving the convenience of assembly, and preventing the first insert 3 from being damaged by friction during the insertion or removal process.

[0062] In some embodiments, the second insertion section includes a connecting portion 33 and a third end 34 connected to each other, the connecting portion 33 is connected to the first insertion section, and the third end 34 is slidably disposed in the cavity. At least a portion of the connecting portion 33 is located in the cavity.

[0063] In some embodiments, a boss 45 is provided in the cavity, and the boss 45 is configured to prevent the third terminal 34 from leaving the cavity. By providing the boss 45, a constricted portion is formed at the end of the cavity, and the cross-sectional area of the constricted portion is smaller than the cross-sectional area of the non-constricted portion. The constricted portion can restrict the third terminal 34 and prevent the third terminal 34 from leaving the cavity.

[0064] The size of the third end 34 is larger than that of the constricted portion, so that the third end 34 will not be separated from the cavity. Figure 5As shown, since the diameter φ3 of the third end 34 is equal to or slightly larger than the outer diameter of the first insertion part 41, and the diameter φ3 of the third end 34 is larger than the diameter of the cavity necking part, the third end 34 cannot enter the cavity from the end where the necking part is located. During assembly, the second insertion section needs to be inserted into the cavity from the end of the cavity far from the necking part. Since the first insertion section includes the second end 32 with a larger diameter, before assembly, the first insertion section and the second insertion section cannot be connected in a fixed connection manner, otherwise the second insertion section cannot pass through the necking part, and the purpose of inserting the first insertion section into the first mounting hole 11 cannot be achieved.

[0065] In the embodiment as Figure 3 shown, the assembly steps of the casing can be as follows:

[0066] First, pass the first insertion section of the first insert 3 through the second mounting hole 21 and insert it into the first mounting hole 11; then, insert the insert body of the second insert 4 into the second mounting hole 21 so that the bottom of the first end 42 contacts the bottom of the groove 22; then, insert the second insertion section of the first insert 3 into the cavity of the second insert 4, and the connecting part 33 of the second insertion section passes out of the cavity and is connected to the first insertion section, such as by welding or threaded connection, etc.; then, install the elastic member 7 into the cavity and abut against the second insertion section; then, connect the first cover plate 43 and the first end 42 through the first connecting member 44 to close the cavity; finally, connect the second cover plate 5 and the outer casing 2 through the second connecting member 6.

[0067] After assembly, a connecting pipe 8 can be inserted into the center of the first insert 3 and the second insert 4. The connecting pipe 8 can be used to lead out the internal gas of the casing. The led-out gas can be transported to a downstream position where it is needed, and the led-out gas can also be used for detection, such as detecting the pressure or temperature of the gas, etc. Of course, the first insert 3 is inserted into the interior of the inner casing 1, and sensors can be arranged on the first insert 3 to extend into the interior of the casing for more direct and accurate measurement.

[0068] As Figure 4 shown, the diameter of the first mounting hole 11 is φ2, and the diameter of the second mounting hole 21 is φ1, φ1≥φ2. There is a first gap L2 between the second insert 4 and the hole wall of the second mounting hole 21. This first gap L2 can compensate for the non - concentricity Δφ between the first mounting hole 11 and the second mounting hole 21. There is a second gap L1 between the second insert 4 and the groove wall of the groove 22, L2≤L1, to ensure that the size of the first gap L2 is the range of adjustable movement of the second insert 4.

[0069] The radial deformation between the inner casing 1 and the outer casing 2 due to the change in the working state can be compensated for the deformation amount ΔH of the radial height H by the compression amount Δt of the elastic member 7.

[0070] The embodiment of the present invention can not only compensate for the inconsistent radial and axial deformations caused by different working states of the engine, but also solve the problem of non-concentricity of the casing mounting holes caused by manufacturing and assembly. Moreover, it can ensure the sealing performance between the inner casing and the first insert, as well as between the outer casing and the second insert, isolate the internal and external flow of the flow path air flow, ensure airtightness, and thus ensure the aerodynamic performance of the flow path.

[0071] Based on the above casing, the present invention further provides an aeroengine, which includes the above casing.

[0072] The positive technical effects of the casing in the above embodiments are equally applicable to the aeroengine and will not be elaborated here.

[0073] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that without departing from the principle of the present invention, it is still possible to modify the specific implementation manners of the present invention or perform equivalent replacements for some technical features. These modifications and equivalent replacements should all be covered by the scope of the technical solutions claimed by the present invention.

Claims

1. A casing, characterized in that, Comprising: An inner casing (1) provided with a first mounting hole (11); An outer casing (2) provided with a second mounting hole (21), and a groove (22) is provided on a side of the outer casing (2) away from the inner casing (1); A first insert (3) inserted into the first mounting hole (11); and A second insert (4) inserted into the second mounting hole (21), a cavity is provided inside the second insert (4), one end of the first insert (3) close to the outer casing (2) is located in the cavity and can slide in the cavity, the second insert (4) includes a first insertion portion (41) inserted into the second mounting hole (21), and there is a first gap between the outer wall of the first insertion portion (41) and the hole wall of the second mounting hole (21); the second insert (4) includes a first end head (42) connected to the first insertion portion (41), the first end head (42) is used to seal the second mounting hole (21), the first end head (42) is located in the groove (22), and there is a second gap between the outer wall of the first end head (42) and the groove wall of the groove (22).

2. The casing according to claim 1, characterized in that, It further includes an elastic member (7) disposed in the cavity, and the elastic member (7) abuts against one end of the first insert (3) close to the outer casing (2).

3. The casing according to claim 1, characterized in that, The second insert (4) includes an insert body and a first cover plate (43), the insert body is inserted into the second mounting hole (21), the cavity is disposed inside the insert body, and the first cover plate (43) is connected to one end of the insert body away from the inner casing (1) and is used to close the cavity.

4. The casing according to claim 1, characterized in that, It further includes a second cover plate (5), the second cover plate (5) is connected to a side of the outer casing (2) away from the inner casing (1) and is used to limit the radial movement of the second insert (4) along the outer casing (2).

5. The casing according to claim 1, characterized in that, The size of the second gap is greater than or equal to the size of the first gap.

6. The casing according to claim 1, characterized in that, The first insert (3) includes a first insertion section and a second insertion section connected to each other, the first insertion section is inserted into the first mounting hole (11), and the second insertion section is inserted into the cavity.

7. The casing according to claim 6, characterized in that, The first insertion section includes a second insertion portion (31) and a second end head (32) connected to each other, the second insertion portion (31) is inserted into the first mounting hole (11), and the second end head (32) is located on a side of the inner casing (1) close to the outer casing (2) and is used to seal the first mounting hole (11).

8. The casing according to claim 7, characterized in that, There is a clearance fit between the first insert (3) and the first mounting hole (11).

9. The casing according to claim 6, characterized in that, The second insertion section includes a connecting portion (33) and a third end head (34) connected to each other, the connecting portion (33) is connected to the first insertion section, and the third end head (34) is slidably disposed in the cavity.

10. The casing according to claim 9, characterized in that, A boss (45) is provided in the cavity, and the boss (45) is configured to prevent the third end head (34) from leaving the cavity.

11. An aeroengine, characterized in that, Comprising the casing according to any one of claims 1 to 10.

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