阅读说明：本技术 带叶尖风扇的多涵道航空发动机机匣结构 (Multi-duct aero-engine casing structure with blade tip fan ) 是由 曹文宇 谢鹏福 徐全勇 于 2021-10-15 设计创作，主要内容包括：本申请提出一种带叶尖风扇的多涵道航空发动机机匣结构,其包括：进气前机匣,进气前机匣包括外层进气前机匣、内层进气前机匣和进气前机匣支板,外层进气前机匣连接于内层进气前机匣的径向外侧；以及风扇机匣,风扇机匣连接于进气前机匣的后侧,风扇机匣包括风扇前机匣和风扇后机匣,风扇前机匣和风扇后机匣之间安装有叶尖风扇,风扇前机匣包括风扇外层前机匣、风扇内层前机匣和风扇前机匣支板,风扇外层前机匣和风扇内层前机匣通过风扇前机匣支板连接在一起,其中,风扇内层前机匣位于内层进气前机匣的后侧,风扇内层前机匣和内层进气前机匣通过止口结构在径向上过渡配合而密封连接,并且二者在轴向上具有活动空间。(The application provides a take many ducts aeroengine machine casket structure of apex fan, it includes: the front air inlet casing comprises an outer air inlet casing, an inner air inlet casing and an air inlet casing support plate, and the outer air inlet casing is connected to the radial outer side of the inner air inlet casing; the fan casing is connected to the rear side of the air inlet front casing and comprises a fan front casing and a fan rear casing, a blade tip fan is mounted between the fan front casing and the fan rear casing, the fan front casing comprises a fan outer layer front casing, a fan inner layer front casing and a fan front casing support plate, the fan outer layer front casing and the fan inner layer front casing are connected together through the fan front casing support plate, the fan inner layer front casing is located on the rear side of the inner layer air inlet front casing, the fan inner layer front casing and the inner layer air inlet front casing are in transition fit in the radial direction through a spigot structure and are in sealing connection, and the fan outer layer front casing and the inner layer air inlet front casing are provided with a movable space in the axial direction.)

1. The utility model provides a take many ducts aeroengine machine casket structure of apex fan which characterized in that, take many ducts aeroengine machine casket structure of apex fan includes:

the front air inlet casing (1) comprises an outer front air inlet casing (11), an inner front air inlet casing (12) and a front air inlet casing support plate (13), wherein the outer front air inlet casing (11) is positioned on the radial outer side of the inner front air inlet casing (12), and the outer front air inlet casing (11) and the inner front air inlet casing (12) are welded together through the front air inlet casing support plate (13); and

the fan casing (2), the fan casing (2) is connected to the rear side of the air inlet front casing (1), the fan casing (2) comprises a fan front casing (21) and a fan rear casing (22), a blade tip fan (100) is installed between the fan front casing (21) and the fan rear casing (22),

the front fan casing (21) comprises a front outer fan casing (211), a front inner fan casing (212) and a front fan casing support plate, the front outer fan casing (211) is positioned on the radial outer side of the front inner fan casing (212), the front outer fan casing (211) and the front inner fan casing (212) are connected together through the front fan casing support plate, wherein,

the fan inner layer front casing (212) is located on the rear side of the inner layer air inlet front casing (12), the fan inner layer front casing (212) and the inner layer air inlet front casing (12) are in transition fit in the radial direction through a spigot structure to be in sealing connection, and a movable space is formed between the fan inner layer front casing (212) and the inner layer air inlet front casing in the axial direction.

2. The multi-duct aero engine case structure of the bladed fan according to claim 1,

the rear fan casing (22) comprises an outer fan casing (221) and an inner fan casing (222), the outer fan casing (221) is located on the radial outer side of the inner fan casing (222), the outer fan casing (221) and the inner fan casing (222) are separated and independent from each other, the outer fan casing (221) is connected to the rear side of the outer fan front casing (211),

the fan inner layer front casing (212) and the blade tip fan (100) are hermetically connected through a slot type double-sided labyrinth structure, the fan inner layer front casing (212) and the blade tip fan (100) can relatively rotate and are kept in sealed connection,

the fan inner layer rear casing (222) and the blade tip fan (100) are connected in a sealing mode through a slot type double-sided labyrinth structure, and the fan inner layer rear casing (222) and the blade tip fan (100) can rotate relatively and are kept in sealing connection.

3. The case of a multi-duct aircraft engine according to claim 2, characterized in that said fan outer aft case (221) is a split case.

4. The multi-duct aero engine case structure of the bladed fan of claim 2, wherein the fan inner aft case (222) comprises a first fan inner aft case (222A) and a second fan inner aft case (222B), the second fan inner aft case (222B) connected to a rear side of the first fan inner aft case (222A), the first fan inner aft case (222A) and the second fan inner aft case (222B) for positioning fan secondary stator blades and fan tertiary stator blades, respectively.

5. The multi-duct aero engine case structure of the bladed fan according to claim 4, wherein the multi-duct aero engine case structure of the bladed fan further comprises an intermediate case (3), the intermediate case (3) comprising a first intermediate case (31), a second intermediate case (32), a third intermediate case (33), a fourth intermediate case (34) and an intermediate case support plate (35),

the first intermediate casing (31) is disposed radially outward of the second intermediate casing (32), the second intermediate casing (32) is disposed radially outward of the third intermediate casing (33), the third intermediate casing (33) is disposed radially outward of the fourth intermediate casing (34), the first intermediate casing (31), the second intermediate casing (32), the third intermediate casing (33), and the fourth intermediate casing (34) are connected by the intermediate casing support plate (35),

the front side of the first intermediate casing (31) is connected to the fan outer layer rear casing (221),

the front side of the second intermediate case (32) is connected to the second fan inner layer aft case (222B).

6. The multi-duct aero engine case structure with a tip fan according to claim 5, wherein the multi-duct aero engine case structure with a tip fan further comprises a connecting case (4), the connecting case (4) comprises an outer connecting case (41) and an inner connecting case (42), the outer connecting case (41) is disposed radially outside the inner connecting case (42), the outer connecting case (41) and the inner connecting case (42) are separate and independent from each other,

the outer layer connecting casing (41) is connected to the rear side of the first intermediate casing (31),

the inner layer connecting casing (42) is connected to a rear side of the second intermediate casing (32).

7. The multi-duct aero engine case structure of the bladed fan according to claim 6, wherein the outer layer connecting case (41) and the inner layer connecting case (42) are both split case halves.

8. The multi-duct aero engine case structure of claim 6, wherein the multi-duct aero engine case further comprises a corrugated adapter ring (40), the corrugated adapter ring (40) being connected to a rear side of the second intermediate case (32), the inner layer connection case (42) being connected to a rear side of the corrugated adapter ring (40).

9. The structure of a multi-ducted aircraft engine casing with a bladed fan according to claim 6, characterized in that it further comprises an aft turbine casing (5), said aft turbine casing (5) being connected to the rear side of said connecting casing (4),

the rear turbine casing (5) comprises an outer rear turbine casing (51), an inner rear turbine casing (52) and a rear turbine casing support plate (53), the outer rear turbine casing (51) is located on the radial outer side of the inner rear turbine casing (52), and the outer rear turbine casing (51) and the inner rear turbine casing (52) are connected together through the rear turbine casing support plate (53).

10. The multi-duct aero engine case structure with a bladed fan according to claim 9, wherein the multi-duct aero engine case further comprises a thrust augmentation case (6), the thrust augmentation case (6) comprising an outer thrust augmentation case (61), an inner thrust augmentation case (62), and thrust augmentation case support plates (63), the outer thrust augmentation case (61) being located radially outside the inner thrust augmentation case (62), the outer thrust augmentation case (61) and the inner thrust augmentation case (62) being connected together by the thrust augmentation case support plates (63),

the booster casing (6) is connected to the rear side of the rear turbine casing (5), a sealing groove is formed between the inner layer booster casing (62) and the inner layer rear turbine casing (52), and a sealing ring (60) is arranged in the sealing groove.

Technical Field

The application belongs to the field of aero-engines, and particularly relates to a multi-duct aero-engine casing structure with a vane tip fan.

Background

Variable cycle propulsion aircraft engines have many advantages over conventional fixed cycle aircraft engines. Along with the continuous improvement of the design level of the aero-engine, the engine cycle and the structure meeting the variable cycle requirements are continuously proposed and evolved, and the variable cycle propulsion aero-engine is gradually used for the power of the main aircraft.

Compared with a variable-cycle engine, the self-adaptive variable-cycle engine is additionally provided with the outer duct on the basis of the double-outer-duct variable-cycle engine, the variation range of the engine duct ratio can be further improved by the aid of the added outer duct, the comprehensive performance of the engine in a covered line is optimized, the overflow resistance is reduced, and the problem of separation of a boundary layer of an air inlet can be solved. The outer duct has small airflow pressurization, low temperature and sufficient flow, is an ideal cold source, does not interfere the work of a core engine, is suitable for providing sufficient cooling capacity, can provide effective cooling for laser weapons, airplane bodies and the like, and enhances the stealth performance of airplanes.

Compared with a conventional turbofan engine, the number of layers of the casing is increased due to the increased bypass, and a plurality of assembly structure design problems are caused. The casing needs to meet the harsh requirements of the inner and outer casings on deformation coordination, the requirement that an external cable and a pipeline penetrate through the casing, the spatial structure layout, the unit body assembly, the reserved play allowance, the inner casing sealing, the reliability and the like.

Disclosure of Invention

The application aims at providing a multi-duct aeroengine casing structure with a blade tip fan, which meets the requirements of force transfer, deformation coordination and whole machine assembly of an inner casing and an outer casing and keeps the inner casing and the outer casing sealed.

The application provides a take many ducts aeroengine machine casket structure of apex fan, take many ducts aeroengine machine casket structure of apex fan includes:

the front air inlet casing comprises an outer front air inlet casing, an inner front air inlet casing and a front air inlet casing support plate, the outer front air inlet casing is positioned on the radial outer side of the inner front air inlet casing, and the outer front air inlet casing and the inner front air inlet casing are welded together through the front air inlet casing support plate; and

the fan casing is connected to the rear side of the air inlet front casing and comprises a fan front casing and a fan rear casing, a blade tip fan is arranged between the fan front casing and the fan rear casing,

the front fan casing comprises an outer-layer front fan casing, an inner-layer front fan casing and a front fan casing support plate, the outer-layer front fan casing is positioned on the radial outer side of the inner-layer front fan casing, the outer-layer front fan casing and the inner-layer front fan casing are connected together through the front fan casing support plate, wherein,

the fan inner layer front casing is positioned at the rear side of the inner layer air inlet front casing, the fan inner layer front casing and the inner layer air inlet front casing are in transition fit in the radial direction through a spigot structure and are in sealing connection, and the fan inner layer front casing and the inner layer air inlet front casing are provided with a movable space in the axial direction.

Preferably, the rear fan casing includes an outer fan casing and an inner fan casing, the outer fan casing is located at a radially outer side of the inner fan casing, the outer fan casing and the inner fan casing are separate and independent from each other, the outer fan casing is connected to a rear side of the outer fan casing,

the fan inner layer front casing and the blade tip fan are hermetically connected through a slot type double-sided labyrinth structure, the fan inner layer front casing and the blade tip fan can relatively rotate and keep the sealed connection,

the fan inner layer rear casing and the blade tip fan are connected in a sealing mode through a slot type double-sided labyrinth structure, and the fan inner layer rear casing and the blade tip fan can rotate relatively and keep connected in a sealing mode.

Preferably, the outer-layer rear casing of the fan is a half-divided casing.

Preferably, the fan inner layer rear casing includes a first fan inner layer rear casing and a second fan inner layer rear casing, the second fan inner layer rear casing is connected to the rear side of the first fan inner layer rear casing, and the first fan inner layer rear casing and the second fan inner layer rear casing are used for respectively positioning the fan secondary stator blade and the fan tertiary stator blade.

Preferably, the multi-duct aeroengine casing structure with the blade tip fan further comprises an intermediate casing, wherein the intermediate casing comprises a first intermediate casing, a second intermediate casing, a third intermediate casing, a fourth intermediate casing and an intermediate casing support plate,

the first intermediate case is disposed radially outward of the second intermediate case, the second intermediate case is disposed radially outward of the third intermediate case, the third intermediate case is disposed radially outward of the fourth intermediate case, the first intermediate case, the second intermediate case, the third intermediate case, and the fourth intermediate case are connected by the intermediate case support plate,

the front side of the first intermediate case is connected to the fan outer layer rear case,

the front side of the second intermediate case is connected to the second fan inner layer rear case.

Preferably, the multi-duct aircraft engine case further comprises a connecting case, the connecting case comprises an outer connecting case and an inner connecting case, the outer connecting case is arranged on the radial outer side of the inner connecting case, the outer connecting case and the inner connecting case are separated and independent from each other,

the outer connecting casing is connected to the rear side of the first intermediate casing,

the inner layer connecting casing is connected to the rear side of the second middle casing.

Preferably, the outer layer connecting casing and the inner layer connecting casing are both split casings.

Preferably, the casing of the multi-duct aircraft engine further comprises a corrugated adapter ring, the corrugated adapter ring is connected to the rear side of the second middle casing, and the inner layer connecting casing is connected to the rear side of the corrugated adapter ring.

Preferably, the multi-duct aircraft engine casing further comprises an aft turbine casing, the aft turbine casing being connected to an aft side of the connecting casing,

the turbine rear casing comprises an outer layer turbine rear casing, an inner layer turbine rear casing and a turbine rear casing support plate, the outer layer turbine rear casing is located on the radial outer side of the inner layer turbine rear casing, and the outer layer turbine rear casing and the inner layer turbine rear casing are connected together through the turbine rear casing support plate.

Preferably, the case of the multi-duct aircraft engine further comprises a stress application case, the stress application case comprises an outer stress application case, an inner stress application case and a stress application case support plate, the outer stress application case is positioned on the radial outer side of the inner stress application case, the outer stress application case and the inner stress application case are connected together through the stress application case support plate,

the afterburning machine casing is connected in the rear side of the rear turbine casing, a sealing groove is formed between the inner afterburning machine casing and the inner rear turbine casing, and a sealing ring is arranged in the sealing groove.

By adopting the technical scheme, the inner-layer casing is connected with the inner-layer air inlet front casing by using the spigot structure, so that the inner-layer casing is sealed, and play allowance is reserved.

Drawings

FIG. 1 shows a schematic half-section view of a multi-ducted aircraft engine case structure with a bladed tip fan according to an embodiment of the present application.

FIG. 2 illustrates an exploded view of a multi-ducted aircraft engine case structure with a bladed tip fan according to an embodiment of the present application.

FIG. 3 illustrates a semi-sectional exploded view of a multi-ducted aircraft engine case structure with a bladed tip fan according to an embodiment of the present application.

FIG. 4 illustrates a half-section exploded view of a fan case of a multi-ducted aircraft engine case structure with a bladed fan according to an embodiment of the present application.

Fig. 5 shows a partial enlarged view of the portion P in fig. 1.

FIG. 6 illustrates a structural schematic view of an intermediate case of a multi-ducted aircraft engine case structure with a bladed tip fan according to an embodiment of the present application.

FIG. 7 illustrates a close-up view of an intermediate case and a connection portion connecting the cases of a multi-ducted aircraft engine with a bladed fan according to an embodiment of the present application.

FIG. 8 illustrates a schematic half-section view of a corrugated adapter ring of a multi-ducted aircraft engine case structure with a bladed tip fan according to an embodiment of the present application.

Fig. 9 shows a partially enlarged view of a portion Q in fig. 1.

Description of the reference numerals

1 front inlet casing 11 outer layer front inlet casing 12 inner layer front inlet casing 13 front inlet casing support plate

2 Fan casing

21 Fan front case 211 Fan outer front case 212 Fan inner front case

22 fan rear casing 221 fan outer layer rear casing 222 fan inner layer rear casing 222A first fan inner layer rear casing 222B second fan inner layer rear casing

3 intermediate case 31 first intermediate case 32 second intermediate case 33 third intermediate case 34 fourth intermediate case 35 intermediate case support plate

Outer layer connecting casing 42 inner layer connecting casing 41 of 4-connecting casing 40 corrugated adapter ring

5 turbine rear case 51 outer layer turbine rear case 52 inner layer turbine rear case 53 turbine rear case support plate

6 afterburning cartridge receiver 60 sealing washer 61 skin afterburning cartridge receiver 62 inlayer afterburning cartridge receiver 63 afterburning cartridge receiver supporting plate of afterburning cartridge receiver

100 tip fan

The A axis is towards the C circumference.

Detailed Description

In order to more clearly illustrate the above objects, features and advantages of the present application, a detailed description of the present application is provided in this section in conjunction with the accompanying drawings. This application is capable of embodiments in addition to those described herein, and is intended to cover such departures from the present disclosure as come within known or customary practice in the art to which this application pertains and which fall within the limits of the appended claims. The protection scope of the present application shall be subject to the claims.

In the following description, "front" refers to an upstream side of an airflow in the casing, and "rear" refers to a downstream side of the airflow in the casing.

As shown in fig. 1 to 9, the present application provides a multi-duct aircraft engine casing structure with a blade tip fan, which includes a front air inlet casing 1, a fan casing 2, a middle casing 3, a connecting casing 4, a rear turbine casing 5, and a thrust augmentation casing 6, wherein the front air inlet casing 1, the fan casing 2, the middle casing 3, the connecting casing 4, the rear turbine casing 5, and the thrust augmentation casing 6 are sequentially connected together along a flow direction of air in the casing.

(Inlet front case)

As shown in fig. 1 to 3, the front intake casing 1 includes an outer front intake casing 11, an inner front intake casing 12, and a front intake casing support plate 13. The outer-layer air inlet front casing 11 and the inner-layer air inlet front casing 12 are both cylindrical, the outer-layer air inlet front casing 11 is located on the radial outer side of the inner-layer air inlet front casing 12, and the outer-layer air inlet front casing 11 and the inner-layer air inlet front casing 12 are welded together through an air inlet front casing support plate 13. The front intake casing support plate 13 may be provided in plurality in the circumferential direction of the front intake casing 1.

(Fan case)

As shown in fig. 1 to 5, the fan casing 2 (also called a Flade casing) includes a front fan casing 21 and a rear fan casing 22, the front fan casing 21 is connected to the rear side of the front intake casing 1, and the rear fan casing 22 is located on the rear side of the front fan casing 21.

Fan front case 21 includes a fan outer front case 211, a fan inner front case 212, and a fan front case support plate. Fan inner front case 212 may position the fan primary stator blades. The outer front fan casing 211 and the inner front fan casing 212 are both cylindrical, the outer front fan casing 211 is located on the radial outer side of the inner front fan casing 212, and the outer front fan casing 211 and the inner front fan casing 212 are connected together through a front fan casing support plate. In the circumferential direction of the fan casing 2, a plurality of front casing support plates of the fan can be arranged according to the force transmission requirement.

As shown in fig. 4 and 5, a tip fan 100 (also called a Flade fan) is disposed behind the fan inner front casing 212, and the tip fan 100 includes a middle crown and blades connected to the middle crown, and the middle crown and the fan inner front casing 212 are sealed. Blade 100 is rotatable relative to blade inner front casing 212 and blade 100 is rotatable relative to blade inner rear casing 222 of blade rear casing 22.

The front side edge and the rear side edge of the middle crown of tip fan 100 are both provided with annular grooves, the annular grooves on the front side of tip fan 100 are used for receiving fan inner front casing 212, fan inner front casing 212 and tip fan 100 are connected through a slot type double-sided labyrinth structure, and fan inner front casing 212 and tip fan 100 can rotate relatively and keep sealed. The rear annular groove of tip fan 100 is configured to receive inner fan casing 222 of rear fan casing 22, and inner fan casing 222 and tip fan 100 are connected by a slot-in double-sided labyrinth structure, such that inner fan casing 222 and tip fan 100 are capable of rotating relative to each other and maintaining a seal. The slot type double-sided grid structure means that grid teeth are arranged on two side walls of the groove, and the grid teeth are matched to ensure tight sealing.

The rear fan casing 22 includes a rear outer fan casing 221 and a rear inner fan casing 222, the rear outer fan casing 221 is located radially outside the rear inner fan casing 222, and the rear outer fan casing 221 and the rear inner fan casing 222 are separate and independent from each other.

The fan outer rear casing 221 is a half-split casing, in other words, the fan outer rear casing 221 includes two half-arc tile-shaped fan outer rear casing subsections, and a cylindrical casing can be formed by connecting the two fan outer rear casing subsections together. By using the split casing, an inner casing including the fan inner front casing 212 and the fan inner rear casing 222 can be installed first in the assembly process (for example, the connection between the fan inner rear casing 222 and the middle casing 3 can be performed before the connection between the fan outer rear casing 221 and the middle casing 3), so that the aircraft engine casing can be easily assembled.

The fan inner rear casing 222 is cylindrical. Further, the fan inner rear casing 222 includes a first fan inner rear casing 222A and a second fan inner rear casing 222B, and the second fan inner rear casing 222B is connected to a rear side of the first fan inner rear casing 222A. The first fan inner rear case 222A and the second fan inner rear case 222B may be connected by flanges and bolts. The detachable first fan inner layer rear casing 222A and the second fan inner layer rear casing 222B easily position the fan secondary stator blade and the fan tertiary stator blade, respectively.

The fan outer rear case 221 is attached to the rear side of the fan outer front case 211, and for example, the fan outer rear case 221 and the fan outer front case 211 may be connected by flanges and bolts.

As shown in fig. 1 to 3 and 5, the fan case 2 is attached to the rear side of the inlet front case 1.

Specifically, the outer front fan casing 211 is connected to the rear side of the outer front inlet casing 11, for example, the outer front fan casing 211 and the outer front inlet casing 11 may be connected by flanges and bolts. Fan inner forward case 212 is coupled to a rear side of inner forward inlet case 12, e.g., fan inner forward case 212 and inner forward inlet case 12 mate via a spigot arrangement. The spigot structure may be stepped, the stepped structure of the inner intake front casing 12 may be located radially outside the stepped structure of the fan inner intake front casing 212, and an inner circumferential surface of the stepped structure of the inner intake front casing 12 and an outer circumferential surface of the stepped structure of the fan inner intake front casing 212 may be in transition fit in a radial direction, so that the inner intake front casing 12 and the fan inner intake front casing 212 are sealed. In addition, the step structures of the two can have certain axial activity, and the two are not easy to extrude each other to deform or generate stress even if deformed under the high-temperature environment of the compression system.

(middle case)

As shown in fig. 6, the intermediate casing 3 includes a first intermediate casing 31, a second intermediate casing 32, a third intermediate casing 33, a fourth intermediate casing 34, and an intermediate casing support plate 35, wherein each of the first intermediate casing 31, the second intermediate casing 32, and the third intermediate casing 33 may be cylindrical, and the fourth intermediate casing 34 may be conical. The first intermediate casing 31 is disposed radially outward of the second intermediate casing 32, the second intermediate casing 32 is disposed radially outward of the third intermediate casing 33, and the third intermediate casing 33 is disposed radially outward of the fourth intermediate casing 34, forming 3 annular spaces, i.e., three ducts, between the 4-layer casings.

The first intermediate casing 31, the second intermediate casing 32, the third intermediate casing 22 and the fourth intermediate casing 34 are connected by an intermediate casing support plate 35, and the intermediate casing support plate 35 may be hollow, and may have a bearing cavity oil passage, an air passage, a cable, etc. therein. In the circumferential direction of the intermediate case 3, the intermediate case support plate 35 may be provided in plural numbers, for example, 8 numbers.

The front side of the first intermediate case 31 is connected to the fan outer rear case 221, and the first intermediate case 31 and the fan outer rear case 221 may be connected by flanges and bolts. The front side of the second intermediate case 32 is connected to the second fan inner layer rear case 222B, and the second intermediate case 32 and the second fan inner layer rear case 222B may be connected by flanges and bolts.

(connecting casing)

As shown in fig. 1 to 3, the connecting casing 4 includes an outer connecting casing 41 and an inner connecting casing 42, the outer connecting casing 41 is disposed radially outside the inner connecting casing 42, and the outer connecting casing 41 and the inner connecting casing 42 are separate and independent from each other.

As shown in fig. 7 and 8, the outer layer connecting casing 41 is connected to the rear side of the first intermediate casing 31, and the outer layer connecting casing 41 and the first intermediate casing 31 may be connected by flanges and bolts.

The second intermediate case 32 and the inner layer connecting case 42 are connected by a corrugated adapter ring 40, the corrugated adapter ring 40 is connected to the rear side of the second intermediate case 32, and the corrugated adapter ring 40 and the second intermediate case 32 may be connected by flanges and bolts. The inner layer connecting casing 42 is connected to the rear side of the corrugated adapter ring 40, and the inner layer connecting casing 42 and the corrugated adapter ring 40 may be connected by flanges and bolts.

The corrugated adapter ring 40 may have a wave-shaped cross-section, and a seal may be maintained between the second intermediate case 32, which is an inner case, and the inner connecting case 42 by the corrugated adapter ring 40. And the corrugated adapter ring 40 is able to withstand certain axial and radial deformations, the second intermediate case 32 and the inner connecting case 42 will not cause seal failure even if deformed by high temperatures.

The outer layer connecting casing 41 and the inner layer connecting casing 42 are both divided into half casings, in other words, the outer layer connecting casing 41 includes a semicircular tile-shaped outer layer connecting casing sub-portion, and a cylindrical casing can be formed by connecting the two outer layer connecting casing sub-portions together. The inner-layer connecting casing 42 includes a semicircular tile-shaped inner-layer connecting casing part, and a cylindrical casing can be formed by connecting two inner-layer connecting casing parts together.

By such a split casing, an inner casing comprising the inner connecting casing 42 and the corrugated adapter ring 40 can be mounted first during assembly, which facilitates the assembly of the internal structure of the aircraft engine casing.

(turbine rear case)

As shown in fig. 1 to 3, the turbine aft case 5 includes an outer turbine aft case 51, an inner turbine aft case 52, and a turbine aft case brace 53. The outer-layer turbine rear casing 51 and the inner-layer turbine rear casing 52 are both cylindrical, the outer-layer turbine rear casing 51 is located on the radial outer side of the inner-layer turbine rear casing 52, and the outer-layer turbine rear casing 51 and the inner-layer turbine rear casing 52 are connected together through a turbine rear casing support plate 53. The turbine aft case support plate 53 may be provided in plural numbers in the circumferential direction of the turbine aft case 5. The turbine rear casing support plate 53 may be cylindrical, the outer turbine rear casing 51 and the inner turbine rear casing 52 are provided with through holes corresponding to the turbine rear casing support plate 53, the turbine rear casing support plate 53 may be hollow, and the radial outer portion of the outer turbine rear casing 51 and the radial inner portion of the inner turbine rear casing 52 may be communicated through the turbine rear casing support plate 53.

The turbine rear case 5 is connected to the rear side of the connecting case 4. Specifically, the outer turbine rear case 51 is attached to the rear side of the outer connection case 41, and the outer turbine rear case 51 and the outer connection case 41 may be connected by flanges and bolts. The inner turbine aft case 52 is attached to the aft side of the inner layer connecting case 42, and the inner turbine aft case 52 and the inner layer connecting case 42 may be connected by flanges and bolts.

(Booster case)

As shown in fig. 1 to 3, the booster casing 6 includes an outer-layer booster casing 61, an inner-layer booster casing 62, and a booster casing support plate 63. The outer-layer stressing casing 61 and the inner-layer stressing casing 62 are both cylindrical, the outer-layer stressing casing 61 is located on the radial outer side of the inner-layer stressing casing 62, and the outer-layer stressing casing 61 and the inner-layer stressing casing 62 are connected together through a stressing casing support plate 63. In the circumferential direction of the booster casing 6, a plurality of booster casing support plates 63 may be provided. The stressing casing support plate 63 can be cylindrical, the outer stressing casing 61 and the inner stressing casing 62 are provided with through holes corresponding to the stressing casing support plate 63, the radial outer part of the outer stressing casing 61 and the radial inner part of the inner stressing casing 62 can be communicated through the stressing casing support plate 63, and a stressing fuel pipeline is convenient to install.

As shown in fig. 9, the outer thrust runner 61 is attached to the rear side of the outer turbine rear runner 51, and the outer thrust runner 61 and the outer turbine rear runner 51 may be connected by flanges and bolts. The inner thrust augmentation casing 62 is connected to the rear side of the inner turbine rear casing 52, and a seal ring 60 is provided between the inner thrust augmentation casing 62 and the inner turbine rear casing 52.

Specifically, a seal groove is formed between the inner thrust augmentation casing 62 and the inner turbine aft casing 52, and the seal ring 60 is disposed in the seal groove. The seal 60 is preferably a w-seal. The seal ring 60 may maintain the seal of the inner case in a non-stressed configuration and the inner thrust augmentation case 62 and the inner turbine aft case 52 may also have some amount of mobility. The seal ring 60 may be made of a metal material.

The seal ring 60 can maintain the seal between the inner thrust augmentation casing 62, which is a non-thrust bearing structure inner casing, and the inner turbine rear casing 52. And the seal ring 60 is able to withstand certain axial and radial deformations, the inner thrust case 62 and the inner turbine aft case 52 will not cause seal failure even if deformed at high temperatures.

While the present application has been described in detail with reference to the above embodiments, it will be apparent to those skilled in the art that the present application is not limited to the embodiments described in the present specification. The present application can be modified and implemented as a modified embodiment without departing from the spirit and scope of the present application defined by the claims. Therefore, the description in this specification is for illustrative purposes and does not have any limiting meaning for the present application.