Composite flame tube and aeroengine

Abstract

This invention discloses a composite material flame tube and an aero-engine, belonging to the field of aero-engine technology. The flame tube includes a metal frame, an inner ring assembly, and an outer ring assembly. The metal frame includes a flame tube head assembly, a nozzle seat support rod, a positioning pin support rod, an outer ring outlet assembly, and an inner ring outlet assembly. The flame tube head assembly includes an annular head base, which is connected to the outer ring outlet assembly via the nozzle seat support rod and the positioning pin support rod. The head base is also connected to the inner ring outlet assembly via the positioning pin support rod. A nozzle seat is installed in a pre-set mounting hole on the nozzle seat support rod. A positioning pin bolt is installed in a pre-set sixth screw hole on the positioning pin support rod. The positioning pin bolt is used to connect and position the inner ring of the flame tube to the positioning pin support rod, and also to connect and position the outer ring of the flame tube to the positioning pin support rod. This invention can solve the problem of poor sealing between the metal material and the non-metallic composite material in the hot state of the flame tube.

Description

Technical Field

[0001] This invention relates to the field of aero-engine technology, and in particular, to a composite material flame tube. Furthermore, this invention also relates to an aero-engine comprising the aforementioned composite material flame tube. Background Technology

[0002] In the field of aero-engines, traditional high-temperature alloy combustors are prone to creep deformation under high-temperature and high-pressure environments. Therefore, materials with higher temperature resistance are needed to ensure the high-performance and stable operation of the combustor and extend its lifespan. Non-metallic composite materials, such as ceramic matrix composites, have higher temperature resistance and lower density than metallic materials, making them a superior choice for advanced aero-engine combustors.

[0003] Existing non-metallic composite flame tubes often employ direct bonding or clearance fit structures with metal structures. The outer and inner ring outlet positions of the flame tube, turbine casing, turbine guide vanes, and other structures frequently utilize beak-like or overlapping structures. The clearance fit structure experiences significant vibration during engine operation, and current technology cannot prevent contact between the non-metallic composite flame tube and the fixing pin, leading to localized high stress and stress concentration, causing cracks and damage to the outer ring of the non-metallic flame tube. Conversely, the beak-like structure connecting to the turbine casing, turbine guide vanes, and other metal structures is prone to impact damage to the non-metallic materials during initial assembly, resulting in high outlet temperatures, reduced temperature resistance, and susceptibility to ablation, thus affecting engine lifespan. Furthermore, the overlapping structure, due to the significant difference in linear expansion coefficients between non-metallic composites and metals, leads to mismatched expansion amounts, easily causing hot-state leakage or crushing damage, impacting engine performance and lifespan.

[0004] Based on the above analysis, the following problems can be seen in the existing technology:

[0005] 1. The assembly and overlapping of metallic and non-metallic composite materials are prone to stress concentration, which can cause cracks and damage to parts. Examples include the assembly of nozzles, electric nozzles and fixing pins with the flame tube, and the overlapping joint between the flame tube outlet and the turbine high guide.

[0006] 2. Due to the difference in the coefficients of thermal expansion between metallic materials and non-metallic composite materials, problems such as poor sealing between metallic materials and non-metallic composite materials under hot conditions may occur.

[0007] 3. The vibration of non-metallic composite materials affects the lifespan of the flame tube. Summary of the Invention

[0008] One object of the present invention is to provide a composite material flame tube.

[0009] Another object of the present invention is to provide an aircraft engine comprising the above-mentioned non-metallic composite material flame tube.

[0010] According to one aspect of the present invention, a composite material flame tube is provided, comprising a metal frame, and an inner ring assembly and an outer ring assembly for forming the flame tube wall and made of a non-metallic composite material:

[0011] The inner ring assembly includes the inner ring of the flame tube, and the outer ring assembly includes the outer ring of the flame tube;

[0012] The metal frame includes the flame tube head assembly, the electric nozzle seat support rod, the locating pin support rod, the outer ring outlet assembly, and the inner ring outlet assembly.

[0013] The flame tube head assembly includes an annular head base. The head base is connected to the outer ring outlet assembly via an electric nozzle seat support rod and a positioning pin support rod. The head base is connected to the inner ring outlet assembly via a positioning pin support rod. The head base is used to limit and seal the first end of the inner ring of the flame tube and the first end of the outer ring of the flame tube, respectively. The outer ring outlet assembly is used to limit and seal the second end of the outer ring of the flame tube, and the inner ring outlet assembly is used to limit and seal the second end of the inner ring of the flame tube.

[0014] A nozzle holder is installed in the pre-set mounting hole on the nozzle holder support rod. The nozzle holder is used to fix and install the nozzle.

[0015] A positioning pin bolt is installed in the sixth screw hole on the positioning pin support rod. The positioning pin bolt is used to connect and position the inner ring of the flame tube to the positioning pin support rod. The positioning pin bolt is also used to connect and position the outer ring of the flame tube to the positioning pin support rod.

[0016] In one or more embodiments of the non-metallic composite flame tube, an outer ring mounting portion and an inner ring mounting portion are provided on the head substrate. The outer ring mounting portion is provided with an outer ring U-shaped groove, which is used to limit the first end of the outer ring of the flame tube. The inner ring mounting portion is provided with an inner ring U-shaped groove, which is used to limit the first end of the inner ring of the flame tube. The flame tube head assembly also includes a sealing member, which is arranged in the outer ring U-shaped groove and the inner ring U-shaped groove. The sealing member is also arranged in the stop groove portion preset in the outer ring outlet assembly and the inner ring outlet assembly. The sealing member is used to seal the first end and the second end of the inner ring of the flame tube. The sealing member is also used to seal the first end and the second end of the outer ring of the flame tube.

[0017] In one or more embodiments of the non-metallic composite flame tube, the outer ring mounting part and the inner ring mounting part are provided with multiple ring arrays arranged on the head base. The side of the outer ring U-shaped groove away from the axis of the head base is designated as the first outer ring surface, the side of the outer ring U-shaped groove near the axis of the head base is designated as the first inner ring surface, the bottom end face of the outer ring U-shaped groove is designated as the first end face, the outer ring surface and the inner ring surface of the flame tube outer ring are respectively designated as the outer ring outer surface and the outer ring inner surface, the outer ring outer surface overlaps with the first outer ring surface, there is a gap between the outer ring inner surface and the first inner ring surface, and the sealing member is provided between the first end face and the first end of the flame tube outer ring.

[0018] In one or more embodiments of the non-metallic composite flame tube, the side of the inner ring U-shaped groove near the head matrix axis is designated as the second outer ring surface, the side of the inner ring U-shaped groove away from the head matrix axis is designated as the second inner ring surface, the bottom end face of the inner ring U-shaped groove is designated as the second end face, the outer ring surface and the inner ring surface of the inner ring of the flame tube are respectively designated as the outer outer surface and the inner inner surface of the inner ring, the outer outer surface overlaps with the second outer ring surface, there is a gap between the inner outer surface and the second inner ring surface, and a sealing member is provided between the second end face and the first end of the inner ring of the flame tube, the sealing member being a bendable sealing ring.

[0019] In one or more embodiments of the non-metallic composite flame tube, the electric nozzle seat support rod includes a first support rod base, a first end of the first support rod base is connected to the head base, a second end of the first support rod base is connected to the outer ring outlet assembly, a mounting hole is formed on the first support rod base, the mounting hole is a screw hole structure, the electric nozzle seat is a cylindrical structure, a mounting platform is protruding on the outer wall of the electric nozzle seat, the lower middle section of the outer wall of the electric nozzle seat is a connecting part, the connecting part is threadedly connected to the mounting hole, and a sealing element is provided between the connecting bottom surface of the bottom end of the electric nozzle seat and the outer wall of the outer ring of the flame tube.

[0020] In one or more embodiments of the non-metallic composite flame tube, the positioning pin support rod includes a second support rod base, which is divided into inner and outer rings arranged in annular arrays. The first end of the inner ring of the second support rod base is connected to the head base, and the second end of the inner ring of the second support rod base is connected to the inner ring outlet assembly. The first end of the outer ring of the second support rod base is connected to the head base, and the second end of the outer ring of the second support rod base is connected to the outer ring outlet assembly. A sixth screw hole is opened on the second support rod base, and a positioning pin seat is protruding on the second support rod base. The positioning pin seat is arranged around the sixth screw hole, and a limiting head is provided on the positioning pin bolt. The positioning pin seat is used to support the locking and limiting head.

[0021] In one or more embodiments of the non-metallic composite flame tube, a first outlet heat insulation ring is provided on the inner ring surface of the second end of the outer ring of the flame tube. The first outlet heat insulation ring is used to shield and protect the outer ring outlet assembly. The outer ring outlet assembly includes a first base plate, on which an outer ring outlet mounting head is provided. The outer ring outlet mounting head is used to connect with the second end of the electric nozzle seat support rod or the second end of the positioning pin support rod. A first stop plate is also protruding on the first base plate, and the first stop plate abuts against the first outlet heat insulation ring.

[0022] In one or more embodiments of the non-metallic composite flame tube, a second outlet heat insulation ring is provided on the outer ring surface of the second end of the inner ring of the flame tube. The second outlet heat insulation ring is used to shield and protect the inner ring outlet assembly. The inner ring outlet assembly includes a second base plate, on which an inner ring outlet mounting head is provided. The inner ring outlet mounting head is used to connect with the second end of the positioning pin support rod. A second stop plate is also protruding on the second base plate, and the second stop plate abuts against the second outlet heat insulation ring.

[0023] In one or more embodiments of the non-metallic composite flame tube, a first positioning pin mounting seat is provided on the outer ring surface of the outer ring of the flame tube, and the first positioning pin mounting seat is used to limit and fix the positioning pin bolt; a second positioning pin mounting seat is provided on the inner ring surface of the inner ring of the flame tube, and the second positioning pin mounting seat is used to limit and fix the positioning pin bolt.

[0024] According to another aspect of the invention, an aircraft engine is also provided, which includes the aforementioned composite material flame tube.

[0025] The present invention has the following beneficial effects:

[0026] This invention relates to a non-metallic composite material flame tube. The flame tube wall is composed of an inner and outer ring assembly of non-metallic composite material. The flame tube wall is assembled and positioned using a metal frame, which also serves to mount the electric nozzle and securely connect it to the casing, ensuring the overall connection strength of the flame tube. A sealing element is used to seal the flame tube wall and the metal frame. The structure of the metal frame inlaid with the non-metallic material flame tube wall provides sufficient clamping force to address air leakage caused by the difference in thermal expansion between the metallic and non-metallic materials. The metal frame also positions the inner and outer ring assemblies of the non-metallic material flame tube. The inner and outer ring assemblies are connected by the metal frame to form an integrated structure, effectively preventing wobbling of the inner and outer ring assemblies and reducing vibration issues on the non-metallic material flame tube wall. The flame tube of this application adopts a detachable structure, resulting in higher maintainability and repairability, more stable performance, and extended flame tube lifespan.

[0027] The aircraft engine of the present invention also has the above-mentioned beneficial effects.

[0028] Of course, any product implementing this invention does not necessarily need to achieve all the advantages described above simultaneously. In addition to the objectives, features, and advantages described above, this invention has other objectives, features, and advantages. The invention will now be described in further detail with reference to the figures. Attached Figure Description

[0029] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0030] Figure 1 This is a cross-sectional schematic diagram of the flame tube according to a preferred embodiment of the present invention;

[0031] Figure 2 This is a schematic cross-sectional view of the flame tube BB according to a preferred embodiment of the present invention.

[0032] Figure 3 This is a schematic diagram of the cross-section AA of the flame tube according to a preferred embodiment of the present invention.

[0033] Figure 4 This is a schematic diagram of the structure of the flame tube head according to a preferred embodiment of the present invention.

[0034] Figure 5 This is a schematic diagram of the flame tube head in a preferred embodiment of the present invention, shown from direction A.

[0035] Figure 6 This is a front view schematic diagram of the electric nozzle seat support rod according to a preferred embodiment of the present invention.

[0036] Figure 7 This is a top view schematic diagram of the electric nozzle seat support rod according to a preferred embodiment of the present invention.

[0037] Figure 8 This is a front view schematic diagram of the positioning pin support rod according to a preferred embodiment of the present invention.

[0038] Figure 9 This is a top view of the positioning pin support rod according to a preferred embodiment of the present invention.

[0039] Figure 10 This is a schematic diagram of the structure of the outer ring outlet of the flame tube according to a preferred embodiment of the present invention.

[0040] Figure 11 This is a schematic diagram of the installation position of the outer ring outlet of the flame tube according to a preferred embodiment of the present invention;

[0041] Figure 12 This is a schematic diagram of the structure of the inner ring outlet of the flame tube according to a preferred embodiment of the present invention.

[0042] Figure 13This is a schematic diagram of the installation position of the inner ring outlet of the flame tube according to a preferred embodiment of the present invention.

[0043] Figure 14 This is a schematic diagram of the structure of the outer ring of the flame tube according to a preferred embodiment of the present invention.

[0044] Figure 15 This is a schematic diagram of the AA section of the outer ring of the flame tube according to a preferred embodiment of the present invention.

[0045] Figure 16 This is a schematic diagram of the BB cross-section of the outer ring of the flame tube according to a preferred embodiment of the present invention.

[0046] Figure 17 This is a schematic diagram of the structure of the inner ring of the flame tube according to a preferred embodiment of the present invention.

[0047] Figure 18 This is a schematic diagram of the locating pin bolt according to a preferred embodiment of the present invention.

[0048] Figure 19 This is a schematic diagram of the structure of the electric nozzle holder according to a preferred embodiment of the present invention.

[0049] Figure 20 This is a schematic diagram of the sealing portion between the flame tube head and the outer ring of the flame tube in a preferred embodiment of the present invention.

[0050] Figure 21 This is a schematic diagram of the connection between the flame tube outlet and the turbine component in a preferred embodiment of the present invention.

[0051] Legend: 1. Flame tube head assembly; 2. Nozzle holder support rod; 3. Positioning pin support rod; 4. Outer ring outlet assembly; 5. Inner ring outlet assembly; 6. Outer ring assembly; 7. Inner ring assembly; 8. Sealing component; 9. Positioning pin bolt; 10. Seal; 11. Nozzle holder; 1-1. Outer ring mounting part; 1-1-1. First screw hole; 1-2. Outer ring U-groove; 1-2-1. First outer ring surface; 1-2-2. First end face; 1-2-3. First inner ring surface; 1-3. Inner ring U-groove; 1-3-1. Second outer ring surface; 1-3-2. Second end face; 1-3-3 1-2 Inner Ring Surface; 1-4 Inner Ring Mounting Part; 1-4-1 Second Screw Hole; 1-5 Head Base; 2-1 First Support Rod Front Mounting Head; 2-1-1 Third Screw Hole; 2-2-1 Mounting Hole; 2-3 First Support Rod Rear Mounting Head; 2-3-1 Fourth Screw Hole; 2-4 First Support Rod Base; 3-1 Second Support Rod Front Mounting Head; 3-1-1 Fifth Screw Hole; 3-2 Positioning Pin Seat; 3-2-1 Sixth Screw Hole; 3-3 Second Support Rod Rear Mounting Head; 3-3-1 Seventh Screw Hole; 3-4 Second Support Rod Base; 4-1 Outer Ring Outlet Mounting Head Part; 4-1-1, Eighth screw hole; 4-2, First front stop groove; 4-3, First rear stop groove; 4-3-1, Stop groove annular surface; 5-1, Inner ring outlet mounting head; 5-1-1, Ninth screw hole; 5-2, Second front stop groove; 5-3, Second rear stop groove; 6-1, Outer ring outer surface; 6-2, Outer ring inner surface; 6-3, First locating pin mounting seat; 6-3-1, First inner hole; 6-4, Electric nozzle mounting seat; 6-4-1, Outer cylindrical surface; 6-4-2, Upper stepped hole; 6-4-3, Stepped hole end face; 6-4-4, Mounting seat end face; 6- 4-5. Lower step hole; 6-5. First outlet heat insulation ring; 6-5-1. Third outer ring surface; 6-5-2. Third inner ring surface; 7-1. Inner ring outer surface; 7-2. Inner ring inner surface; 7-3. Second positioning pin mounting seat; 7-4. Second outlet heat insulation ring; 7-4-1. Fourth outer ring surface; 7-4-2. Fourth inner ring surface; 9-1. Limiting head; 9-2. External thread part; 9-3. Column; 9-4. Relief groove; 11-1. Mounting platform; 11-2. Connecting part; 11-3. Connecting bottom surface; 12. Casing; 13. Electric nozzle; 14. Fixing pin seat. Detailed Implementation

[0052] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings. However, the present invention can be implemented in many different ways as defined and covered below.

[0053] A composite material flame tube includes a metal frame, and an inner ring assembly 7 and an outer ring assembly 6 made of a non-metallic composite material for forming the flame tube wall.

[0054] Inner ring assembly 7 includes an inner ring of the flame tube, and outer ring assembly 6 includes an outer ring of the flame tube;

[0055] The metal frame includes the flame tube head assembly 1, the electric nozzle seat support rod 2, the positioning pin support rod 3, the outer ring outlet assembly 4, and the inner ring outlet assembly 5.

[0056] The flame tube head assembly 1 includes an annular head base 1-5. The head base 1-5 is connected to the outer ring outlet assembly 4 through an electric nozzle seat support rod 2 and a positioning pin support rod 3. The head base 1-5 is connected to the inner ring outlet assembly 5 through a positioning pin support rod 3. The head base 1-5 is used to limit and seal the first end of the inner ring of the flame tube and the first end of the outer ring of the flame tube, respectively. The outer ring outlet assembly 4 is used to limit and seal the second end of the outer ring of the flame tube, and the inner ring outlet assembly 5 is used to limit and seal the second end of the inner ring of the flame tube.

[0057] An electric nozzle holder 11 is provided in the preset mounting hole 2-2-1 on the electric nozzle holder support rod 2. The electric nozzle holder 11 is used to fix and install the electric nozzle 13.

[0058] A positioning pin bolt 9 is provided in the sixth screw hole 3-2-1 on the positioning pin support rod 3. The positioning pin bolt 9 is used to connect and position the inner ring of the flame tube to the positioning pin support rod 3. The positioning pin bolt 9 is also used to connect and position the outer ring of the flame tube to the positioning pin support rod 3.

[0059] Here, "head base 1-5" refers to the limiting structure that connects to the first end of the inner ring and outer ring of the flame tube. In some embodiments, the head base 1-5 is a circular plate structure, with the outer ring of the circular plate connected to one end of the outer ring of the flame tube and the inner ring of the circular plate connected to one end of the inner ring of the flame tube.

[0060] Here, "electric nozzle seat support rod 2" and "positioning pin support rod 3" refer to the support rod structure connected to the head base 1-5. In some embodiments, both the electric nozzle seat support rod 2 and the positioning pin support rod 3 are long rod-shaped or plate-shaped structures.

[0061] It should be noted that a fixing pin seat 14 is provided on the head base 1-5, and a fixing pin is installed in the fixing pin seat 14. The fixing pin is used to connect the flame tube head assembly 1 to the casing 12 of the aero engine.

[0062] The flame tube wall is composed of an inner ring assembly 7 and an outer ring assembly 6 made of non-metallic composite materials. The flame tube wall is assembled and positioned using a metal frame, which also serves to mount the electric nozzle 13 and securely connect it to the casing 12, ensuring the overall connection strength of the flame tube. A sealing element 8 seals the flame tube wall with the metal frame. This metal frame structure provides sufficient clamping force to prevent air leakage caused by the difference in thermal expansion between the metallic and non-metallic materials. The metal frame also positions the inner and outer ring assemblies of the non-metallic flame tube. The connection of the inner and outer ring assemblies through the metal frame forms an integrated structure, effectively preventing wobbling and reducing vibration of the non-metallic flame tube wall.

[0063] Preferably, please refer to Figure 3 , 4 As shown in Figure 5, the head base 1-5 is provided with an outer ring mounting part 1-1 and an inner ring mounting part 1-4. The outer ring mounting part 1-1 is provided with an outer ring U-shaped groove 1-2, which is used to limit the first end of the outer ring of the flame tube. The inner ring mounting part 1-4 is provided with an inner ring U-shaped groove 1-3, which is used to limit the first end of the inner ring of the flame tube. The flame tube head assembly 1 also includes a sealing member 8, which is arranged in the outer ring U-shaped groove 1-2 and the inner ring U-shaped groove 1-3. The sealing member 8 is also arranged in the stop groove of the outer ring outlet assembly 4 and the inner ring outlet assembly 5. The sealing member 8 is used to seal the first end and the second end of the inner ring of the flame tube. The sealing member 8 is also used to seal the first end and the second end of the outer ring of the flame tube.

[0064] Understandably, the head base 1-5 of the annular structure has an outer ring U-shaped groove 1-2 on its outer ring to limit the first end of the outer ring of the flame tube, and an inner ring U-shaped groove 1-3 on its inner ring to limit the first end of the inner ring of the flame tube. Sealing elements 8 are also provided within the outer ring U-shaped groove 1-2 and the inner ring U-shaped groove 1-3 to seal the first ends of the outer and inner rings of the flame tube against the bottom ends of the outer and inner rings. Simultaneously, the pre-set stop grooves of the outer ring outlet assembly 4 and the inner ring outlet assembly 5 provide installation positions for the sealing elements 8, enabling the outer ring outlet assembly 4 and the inner ring outlet assembly 5 to limit the second ends of the outer and inner rings of the flame tube while simultaneously sealing the second ends of the outer and inner rings of the flame tube using the sealing elements 8. These measures can solve the leakage problem caused by the difference in thermal expansion between metallic and non-metallic materials.

[0065] In some embodiments, the outer ring mounting part 1-1 and the inner ring mounting part 1-4 are provided with multiple ring arrays respectively arranged on the head base 1-5. The side of the outer ring U-shaped groove 1-2 away from the axis of the head base 1-5 is designated as the first outer ring surface 1-2-1, the side of the outer ring U-shaped groove 1-2 near the axis of the head base 1-5 is designated as the first inner ring surface 1-2-3, the bottom end face of the outer ring U-shaped groove 1-2 is designated as the first end face 1-2-2, the outer ring surface and the inner ring surface of the outer ring of the flame tube are respectively designated as the outer ring outer surface 6-1 and the outer ring inner surface 6-2, the outer ring outer surface 6-1 overlaps with the first outer ring surface 1-2-1, there is a gap between the outer ring inner surface 6-2 and the first inner ring surface 1-2-3, and the sealing member 8 is provided between the first end face 1-2-2 and the first end of the outer ring of the flame tube.

[0066] It is understandable that the head base 1-5 is provided with multiple outer ring mounting parts 1-1 and multiple inner ring mounting parts 1-4 in a ring array, and the corresponding electric nozzle seat support rod 2 and positioning pin support rod 3 are also provided in multiple ways, so as to strengthen the fixation of the head base 1-5 and strengthen the limiting and fixing of the flame tube wall.

[0067] In some embodiments, the side of the inner ring U-shaped groove 1-3 near the axis of the head base 1-5 is designated as the second outer ring surface 1-3-1, the side of the inner ring U-shaped groove 1-3 away from the axis of the head base 1-5 is designated as the second inner ring surface 1-3-3, the bottom end face of the inner ring U-shaped groove 1-3 is designated as the second end face 1-3-2, the outer ring surface and the inner ring surface of the inner ring of the flame tube are respectively designated as the outer ring surface 7-1 and the inner ring surface 7-2, the outer ring surface 7-1 overlaps with the second outer ring surface 1-3-1, there is a gap between the inner ring surface 7-2 and the second end face 1-3-2, and the sealing member 8 is located between the second end face 1-3-2 and the first end of the inner ring of the flame tube, and the sealing member 8 is a bendable sealing ring.

[0068] It is understandable that the limiting seal of the head base 1-5 on the first end of the inner ring of the flame tube is consistent with the limiting seal on the first end of the outer ring of the flame tube. This ensures the stability of the connection and seal between the head base 1-5 and the inner and outer rings of the flame tube when the temperature rises. The sealing element 8 is preferably a W-type sealing ring.

[0069] It should be noted that, please refer to Figure 20 The outer ring surface 6-1 overlaps with the first outer ring surface 1-2-1, that is, in Figure 20 Point A has a small clearance fit, which helps to seal the outer ring of the flame tube; while there is a gap between the inner surface 6-2 of the outer ring and the first inner ring surface 1-2-3, that is... Figure 20At point B, there is a large clearance fit. As the temperature rises, due to the different coefficients of thermal expansion between the non-metallic composite material and the metallic material, the clearance at point A gradually increases, while the clearance at point B gradually decreases. Under the large clearance condition, point B transforms into a small clearance fit, which can further strengthen the auxiliary sealing of the inner ring of the flame tube. Meanwhile, the clearance at point C also gradually increases, thus reducing the pressure on the sealing element 8 to some extent. However, since the sealing element 8 is flexible, it can continuously provide a sealing effect at point C. These dynamic measures ensure stable assembly and a stable and continuous sealing effect between the outer ring of the non-metallic flame tube and the head assembly 1 of the metallic flame tube. The connection method between the head substrate 1-5 and the inner ring of the flame tube is similar. The dynamically variable connection structure reduces the impact of the difference in thermal expansion coefficients between the metallic and non-metallic materials on the sealing at the connection structure.

[0070] Preferably, please refer to Figure 6 and Figure 7 As shown, the electric nozzle holder support rod 2 includes a first support rod base 2-4. The first end of the first support rod base 2-4 is connected to the head base 1-5, and the second end of the first support rod base 2-4 is connected to the outer ring outlet assembly 4. The mounting hole 2-2-1 is opened on the first support rod base 2-4 and is a screw hole structure. The electric nozzle holder 11 is a cylindrical structure. A mounting platform 11-1 is protruding on the outer wall of the electric nozzle holder 11. The lower middle section of the outer wall of the electric nozzle holder 11 is provided as a connecting part 11-2. The connecting part 11-2 is threadedly connected to the mounting hole 2-2-1. A sealing element 10 is provided between the connecting bottom surface 11-3 at the bottom end of the electric nozzle holder 11 and the outer wall of the outer ring of the flame tube.

[0071] In some embodiments, the first end of the first support rod base 2-4 is provided with a plate-shaped first support rod front mounting head 2-1, which is used to connect with the head base 1-5. The second end of the first support rod base 2-4 is provided with a plate-shaped first support rod rear mounting head 2-3, which is used to connect with the outer ring outlet assembly 4. Specifically, the first support rod front mounting head 2-1 has a third screw hole 2-1-1 that aligns with the first screw hole 1-1-1 on the outer ring mounting part 1-1 and is fastened by bolts. The first support rod rear mounting head 2-3 has a fourth screw hole 2-3-1 that corresponds to the preset eighth screw hole 4-1-1 on the outer ring outlet mounting head 4-1 and is fastened by bolts.

[0072] Understandably, the electric nozzle holder support rod 2 not only connects the head base 1-5 to the outer ring outlet assembly 4 to achieve the clamping, limiting and sealing of the two ends of the outer ring of the flame tube by the head base 1-5 and the outer ring outlet assembly 4, but also serves to install and fix the electric nozzle 13, realizing the multiple functions of the electric nozzle holder support rod 2 and effectively simplifying the structure while ensuring the overall structural strength.

[0073] The connecting part 11-2 of the nozzle holder 11 is connected to the mounting hole 2-2-1 of the nozzle holder support rod 2 via an external thread, realizing the assembly of the nozzle holder 11 and the nozzle holder support rod 2. The connecting bottom surface 11-3 of the nozzle holder 11 presses against the sealing element 10. The other side of the sealing element 10 contacts the stepped hole end face 6-4-3 of the upper stepped hole 6-4-2 of the outer ring of the flame tube, realizing the seal between the nozzle holder 11 and the outer ring of the flame tube. A lower stepped hole 6-4-5 is also provided on the outer ring of the flame tube at the upper stepped hole 6-4-2, which communicates with the upper stepped hole 6-4-2. The lower stepped hole 6-4-5 is used to limit the end of the nozzle 13.

[0074] It should be noted that the sealing element 10 is a C-shaped sealing ring, which can alleviate the difference in radial expansion between the metal material and the non-metallic composite material by the C-shaped ring, and can also ensure the sealing effect between the electric nozzle seat 11 and the outer ring of the flame tube.

[0075] Preferably, please refer to Figure 8 , 9 As shown in Figure 18, the positioning pin support rod 3 includes a second support rod base 3-4, which is arranged in two rings, inner and outer. The first end of the inner ring of the second support rod base 3-4 is connected to the head base 1-5, and the second end of the inner ring of the second support rod base 3-4 is connected to the inner ring outlet assembly 5. The first end of the outer ring of the second support rod base 3-4 is connected to the head base 1-5, and the second end of the outer ring of the second support rod base 3-4 is connected to the outer ring outlet assembly 4. A sixth screw hole 3-2-1 is opened on the second support rod base 3-4. A positioning pin seat 3-2 is protruding on the second support rod base 3-4 and is arranged around the sixth screw hole 3-2-1. A limiting head 9-1 is provided on the positioning pin bolt 9. The positioning pin seat 3-2 is used to support the locking and limiting head 9-1.

[0076] Understandably, the positioning pin support rod 3 not only connects the head base 1-5 to the outer ring outlet assembly 4 to achieve clamping, limiting, and sealing of both ends of the outer ring of the flame tube by the head base 1-5 and the outer ring outlet assembly 4, but also connects the head base 1-5 to the inner ring outlet assembly 5 to achieve clamping, limiting, and sealing of both ends of the inner ring of the flame tube by the head base 1-5 and the inner ring outlet assembly 5. Simultaneously, the positioning pin support rod 3 also serves to install and fix the positioning pin bolt 9, strengthening the limiting and fixing of the inner and outer rings of the flame tube, reducing vibration of the non-metallic flame tube, improving operational stability, and extending the service life of the flame tube. The positioning pin support rod 3 and the electric nozzle seat support rod 2 have multiple functions, which is conducive to structural simplification and enables a detachable structure of the entire metal frame, facilitating maintenance.

[0077] Preferably, please refer to Figure 3 , 10As shown in Figures 14, 15, and 16, a first outlet heat insulation ring 6-5 is provided on the inner ring surface of the second end of the outer ring of the flame tube. The first outlet heat insulation ring 6-5 is used to shield and protect the outer ring outlet assembly 4. The outer ring outlet assembly 4 includes a first base plate, on which an outer ring outlet mounting head 4-1 is provided. The outer ring outlet mounting head 4-1 is used to connect with the second end of the electric nozzle seat support rod 2 or the second end of the positioning pin support rod 3. A first stop plate is also protruding on the first base plate, and the first stop plate abuts against the first outlet heat insulation ring 6-5.

[0078] Understandably, while the outer ring outlet assembly 4 limits and seals the second end of the outer ring of the flame tube, the first outlet heat insulation ring 6-5 overlapping on the outer ring of the flame tube also shields and protects the outer ring outlet assembly 4. The third inner ring surface 6-5-2 of the first outlet heat insulation ring 6-5 is in contact with the combustion gas, and the third outer ring surface 6-5-1 shields the outer ring outlet assembly 4, thus isolating the metal outer ring outlet assembly 4 from the combustion gas and preventing deformation of the overlapping part of the outer ring outlet assembly 4 due to high temperature. It should be noted that the stop groove ring surface 4-3-1 of the first rear stop groove 4-3 of the outer ring outlet assembly 4 overlaps with the turbine guide vane component, realizing the overall fit between the metal frame and the turbine. To ensure the stability of the fit, the first outlet heat insulation ring 6-5 can play a good role in heat insulation protection.

[0079] Preferably, please refer to Figure 3 , 12 As shown in Figures 14 and 17, a second outlet heat insulation ring 7-4 is provided on the outer ring surface of the second end of the inner ring of the flame tube. The second outlet heat insulation ring 7-4 is used to shield and protect the inner ring outlet assembly 5. The inner ring outlet assembly 5 includes a second base plate. An inner ring outlet mounting head 5-1 is provided on the second base plate. The inner ring outlet mounting head 5-1 is used to connect with the second end of the positioning pin support rod 3. A second stop plate is also provided on the second base plate. The second stop plate abuts against the second outlet heat insulation ring 7-4.

[0080] Understandably, the second outlet heat insulation ring 7-4 set on the inner ring of the flame tube also serves to shield and protect the inner ring outlet component 5. It comes into contact with the gas through the fourth outer ring surface 7-4-1, while the inner ring outlet component 5 is shielded by the fourth inner ring surface 7-4-2, which reduces the impact of high temperature.

[0081] Preferably, please refer to Figure 3 , 14 As shown in Figure 17, a first positioning pin mounting seat 6-3 is protruding on the outer ring surface of the outer ring of the flame tube. The first positioning pin mounting seat 6-3 is used to limit and fix the positioning pin bolt 9. A second positioning pin mounting seat 7-3 is protruding on the inner ring surface of the inner ring of the flame tube. The second positioning pin mounting seat 7-3 is used to limit and fix the positioning pin bolt 9.

[0082] It is understandable that multiple first positioning pin mounting seats 6-3 and second positioning pin mounting seats 7-3 are provided to cooperate with positioning pin bolts 9 on multiple positioning pin support rods 3. At the same time, positioning pin bolts 9 distributed in different positions can also limit and fix the inner ring and outer ring of the flame tube in multiple directions, ensuring that the flame tube wall does not vibrate significantly, thereby improving the stability of operation and extending the service life of the flame tube.

[0083] It should be noted that, in order to solve the problem of different axial expansion between metallic materials and non-metallic composite materials, the position of the electric nozzle seat 11 and the outer ring of the flame tube are the same axial position as the position of the positioning pin bolt 9 and the outer ring of the flame tube, so as to achieve axial balance, reduce the impact of expansion difference on the overall assembly structure, and ensure the stability of the assembly.

[0084] According to another aspect of the invention, an aircraft engine is also provided, which includes the aforementioned composite material flame tube.

[0085] The aircraft engine of the present invention also has the above-mentioned beneficial effects.

[0086] It should be noted that, in this document, the terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0087] This article uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only for the purpose of helping to understand the method and core ideas of the present invention. The above descriptions are only preferred embodiments of the present invention. It should be noted that due to the limitations of textual expression, and the objective existence of infinite specific structures, those skilled in the art can make several improvements, modifications, or changes without departing from the principles of the present invention, and can also combine the above technical features in an appropriate manner. These improvements, modifications, changes, or combinations, or the direct application of the inventive concept and technical solution to other situations without modification, should all be considered as protection of the present invention.

Claims

1. A composite material flame tube, characterized in that, Includes a metal frame, and an inner ring assembly (7) and an outer ring assembly (6) made of non-metallic composite material for forming the flame tube wall: The inner ring assembly (7) includes an inner ring of the flame tube, and the outer ring assembly (6) includes an outer ring of the flame tube; The metal frame includes a flame tube head assembly (1), an electric nozzle seat support rod (2), a positioning pin support rod (3), an outer ring outlet assembly (4), and an inner ring outlet assembly (5): The flame tube head assembly (1) includes an annular head base (1-5). The head base (1-5) is connected to the outer ring outlet assembly (4) via an electric nozzle seat support rod (2) and a positioning pin support rod (3). The head base (1-5) is connected to the inner ring outlet assembly (5) via a positioning pin support rod (3). The head base (1-5) is used to limit and seal the first end of the inner ring of the flame tube and the first end of the outer ring of the flame tube, respectively. The outer ring outlet assembly (4) is used to limit and seal the second end of the outer ring of the flame tube. The inner ring outlet assembly (5) is used to limit and seal the second end of the inner ring of the flame tube. An electric nozzle holder (11) is provided in the preset mounting hole (2-2-1) on the electric nozzle holder support rod (2), and the electric nozzle holder (11) is used to fix and install the electric nozzle (13); A positioning pin bolt (9) is provided in the sixth screw hole (3-2-1) on the positioning pin support rod (3). The positioning pin bolt (9) is used to connect and position the inner ring of the flame tube with the positioning pin support rod (3). The positioning pin bolt (9) is also used to connect and position the outer ring of the flame tube with the positioning pin support rod (3).

2. The composite material flame tube according to claim 1, characterized in that, The head base (1-5) is provided with an outer ring mounting part (1-1) and an inner ring mounting part (1-4). The outer ring mounting part (1-1) is provided with an outer ring U-shaped groove (1-2), which is used to limit the first end of the outer ring of the flame tube. The inner ring mounting part (1-4) is provided with an inner ring U-shaped groove (1-3), which is used to limit the first end of the inner ring of the flame tube. The flame tube head assembly (1) also includes a sealing member (8). The sealing member (8) is arranged in the outer ring U-shaped groove (1-2) and the inner ring U-shaped groove (1-3). The sealing member (8) is also arranged in the stop groove of the outer ring outlet assembly (4) and the inner ring outlet assembly (5). The sealing member (8) is used to seal the first end and the second end of the inner ring of the flame tube. The sealing member (8) is also used to seal the first end and the second end of the outer ring of the flame tube.

3. A composite material flame tube according to claim 2, characterized in that, The outer ring mounting part (1-1) and the inner ring mounting part (1-4) are provided with multiple ring arrays arranged on the head base (1-5). The side of the outer ring U-shaped groove (1-2) away from the axis of the head base (1-5) is designated as the first outer ring surface (1-2-1), and the side of the outer ring U-shaped groove (1-2) close to the axis of the head base (1-5) is designated as the first inner ring surface (1-2-3). The bottom end of the outer ring U-shaped groove (1-2) The first end face (1-2-2) is set as the outer ring face. The outer ring face and inner ring face of the outer ring of the flame tube are respectively set as the outer ring outer shape face (6-1) and the outer ring inner shape face (6-2). The outer ring outer shape face (6-1) overlaps with the first outer ring face (1-2-1). There is a gap between the outer ring inner shape face (6-2) and the first inner ring face (1-2-3). The sealing member (8) is set between the first end face (1-2-2) and the first end of the outer ring of the flame tube.

4. A composite material flame tube according to claim 3, characterized in that, The side of the inner ring U-shaped groove (1-3) near the axis of the head base (1-5) is designated as the second outer ring surface (1-3-1), the side of the inner ring U-shaped groove (1-3) away from the axis of the head base (1-5) is designated as the second inner ring surface (1-3-3), the bottom end face of the inner ring U-shaped groove (1-3) is designated as the second end face (1-3-2), the outer ring surface and inner ring surface of the inner ring of the flame tube are designated as the outer outer surface (7-1) and the inner inner surface (7-2) of the inner ring respectively, the outer outer surface (7-1) of the inner ring overlaps with the second outer ring surface (1-3-1), there is a gap between the inner inner surface (7-2) of the inner ring and the second end face (1-3-2), the sealing member (8) is located between the second end face (1-3-2) and the first end of the inner ring of the flame tube, and the sealing member (8) is a bendable sealing ring.

5. A composite material flame tube according to claim 1, characterized in that, The electric nozzle holder support rod (2) includes a first support rod base (2-4), the first end of the first support rod base (2-4) is connected to the head base (1-5), the second end of the first support rod base (2-4) is connected to the outer ring outlet assembly (4), the mounting hole (2-2-1) is opened on the first support rod base (2-4), the mounting hole (2-2-1) is a screw hole structure, the electric nozzle holder (11) is a cylindrical structure, a ring mounting platform (11-1) is protruding on the outer wall of the electric nozzle holder (11), the lower middle section of the outer wall of the electric nozzle holder (11) is set as a connecting part (11-2), the connecting part (11-2) is threadedly connected to the mounting hole (2-2-1), and a sealing element (10) is provided between the connecting bottom surface (11-3) at the bottom end of the electric nozzle holder (11) and the outer wall of the outer ring of the flame tube.

6. A composite material flame tube according to claim 1, characterized in that, The positioning pin support rod (3) includes a second support rod base (3-4), which is arranged in two rings, inner and outer. The first end of the inner ring of the second support rod base (3-4) is connected to the head base (1-5), and the second end of the inner ring of the second support rod base (3-4) is connected to the inner ring outlet assembly (5). The first end of the outer ring of the second support rod base (3-4) is connected to the head base (1-5), and the second end of the outer ring of the second support rod base (3-4) is connected to the outer ring outlet assembly (4). The sixth screw hole (3-2-1) is opened on the second support rod base (3-4). The positioning pin seat (3-2) is protruding on the second support rod base (3-4). The positioning pin seat (3-2) is arranged around the sixth screw hole (3-2-1). The positioning pin bolt (9) is provided with a limiting head (9-1). The positioning pin seat (3-2) is used to support the locking limiting head (9-1).

7. A composite material flame tube according to claim 1, characterized in that, A first outlet heat insulation ring (6-5) is provided on the inner ring surface of the second end of the outer ring of the flame tube. The first outlet heat insulation ring (6-5) is used to shield and protect the outer ring outlet assembly (4). The outer ring outlet assembly (4) includes a first base plate. An outer ring outlet mounting head (4-1) is provided on the first base plate. The outer ring outlet mounting head (4-1) is used to connect with the second end of the electric nozzle seat support rod (2) or the second end of the positioning pin support rod (3). A first stop plate is also protruding on the first base plate. The first stop plate abuts against the first outlet heat insulation ring (6-5).

8. A composite material flame tube according to claim 1, characterized in that, A second outlet heat insulation ring (7-4) is provided on the outer ring surface of the second end of the inner ring of the flame tube. The second outlet heat insulation ring (7-4) is used to shield and protect the inner ring outlet assembly (5). The inner ring outlet assembly (5) includes a second base plate. An inner ring outlet mounting head (5-1) is provided on the second base plate. The inner ring outlet mounting head (5-1) is used to connect with the second end of the positioning pin support rod (3). A second stop plate is also provided on the second base plate. The second stop plate abuts against the second outlet heat insulation ring (7-4).

9. A composite material flame tube according to claim 1, characterized in that, A first positioning pin mounting seat (6-3) is provided on the outer ring surface of the outer ring of the flame tube. The first positioning pin mounting seat (6-3) is used to limit and fix the positioning pin bolt (9). A second positioning pin mounting seat (7-3) is provided on the inner ring surface of the inner ring of the flame tube. The second positioning pin mounting seat (7-3) is used to limit and fix the positioning pin bolt (9).

10. An aircraft engine, characterized in that, Includes the composite material flame tube as described in any one of claims 1 to 9.

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