Non-metallic composite combustion chamber flame tube based on elastic connecting structure

Abstract

The present application belongs to the technical field of combustion chamber flame tube structure, and particularly relates to a non-metallic composite material combustion chamber flame tube based on elastic connecting structure, which adopts various elastic connecting structures between the inner and outer rings of the non-metallic composite material flame tube and the head ring of the metal material flame tube, changes the thermal matching deformation into elastic matching, has good thermal expansion matching performance, good sealing performance and assembly performance, can maintain good sealing performance under hot state, and effectively reduces the flame tube air leakage problem caused by the mismatch of thermal expansion amount. The elastic connecting structure of the inner and outer rings of the flame tube can effectively disperse the axial and circumferential stress, reduce the stress concentration of the non-metallic composite material, reduce the risk of damage caused by uneven stress of the matrix, and increase the service life of the non-metallic material flame tube. Meanwhile, the present application also has split structure design, which can effectively improve the maintainability of the flame tube, reduce the maintenance cost, and has high engineering application value.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of combustion chamber flame tube structure, and particularly relates to a non-metallic composite combustion chamber flame tube based on an elastic connecting structure. BACKGROUND

[0002] The combustion chamber is one of the three core components of an aero-engine. In the thermodynamic cycle of a gas turbine engine, the combustion chamber completes the heating process, converts the chemical energy of combustion into heat energy, and drives the turbine to do work. It can be said that the combustion chamber is the "heart" of the engine. The flame tube is a component for organizing combustion in the combustion chamber and is prone to creep deformation under high temperature and high pressure environments. In order to improve the thrust-to-weight ratio and the turbine inlet gas temperature, advanced military aero-engines are developing towards higher temperature rise, and it is required that no less than 70% of the air participates in combustion. Therefore, the air used for cooling the flame tube wall will be greatly reduced, which will bring great challenges to the service life and durability of the flame tube. Therefore, more high-temperature-resistant materials need to be used to ensure the stable operation of the combustion chamber with high performance. Non-metallic composite materials, such as ceramic matrix composites, have higher temperature resistance and smaller density than metal materials. For a flame tube made of non-metallic composite materials, the connection form with metal material structures (such as fixing pins, turbine casings, turbine guide vanes, etc.) needs to be considered. The linear expansion coefficients of the two materials are quite different, and the expansion difference under thermal state is large, which is easy to cause air leakage or extrusion damage, and is difficult to achieve application in engineering.

[0003] The existing non-metallic composite flame tube and metal structure (fixing pin, electric nozzle) often adopt direct lap joint or gap fit structure, and the flame tube inner and outer ring outlet positions are connected with the turbine casing, turbine guide vane and other structures by using conventional bird beak structure or bird beak lap joint structure. The gap fit structure has large vibration during engine operation, and the existing technology cannot avoid the contact between the non-metallic composite flame tube and the fixing pin, which causes large local stress and stress concentration, and causes problems such as cracks and damage of the non-metallic composite flame tube outer ring. The bird beak structure is used to connect the non-metallic material with the turbine casing, turbine guide vane and other metal structures, which is easy to cause damage of the non-metallic material during initial assembly, the temperature at the outlet position is high, the temperature resistance is reduced, and the ablation is easy to occur, thereby affecting the service life of the engine. Similarly, the bird beak lap joint structure is used, and the linear expansion coefficients of the non-metallic composite material and the metal composite material are quite different, the expansion amounts of the two kinds of material parts are not matched, and the thermal state air leakage or extrusion damage is easy to occur, thereby affecting the performance of the engine. SUMMARY

[0004] In order to solve or partially solve the problems in the prior art, the present application provides a non-metallic composite combustion chamber flame tube based on an elastic connecting structure, which mainly solves the technical problems of air leakage and extrusion damage of the flame tube caused by the inconsistent thermal expansion of the non-metallic composite combustion chamber flame tube and the metal material.

[0005] The application provides a non-metallic composite combustion chamber flame tube based on an elastic connecting structure, which comprises a non-metallic composite inner ring and an outer ring of the flame tube and a metal material head ring of the flame tube; a flexible connecting structure assembly is arranged on the inner ring and the outer ring of the flame tube and is used for connecting the head ring of the flame tube;

[0006] An elastic supporting ring is arranged at the connecting position of the outer ring and the inner ring of the flame tube and the flexible connecting structure assembly;

[0007] An outer ring outlet support and an outlet elastic supporting ring are arranged at the outlet position of the outer ring of the flame tube, and an elastic sealing ring is arranged between the outlet elastic supporting ring and the outer ring outlet support;

[0008] An inner ring outlet support is arranged at the outlet position of the inner ring of the flame tube, and an elastic ring is arranged between the inner ring outlet support and the inner ring of the flame tube.

[0009] Further, a swirler mounting hole and a fixing pin mounting seat are arranged on the head ring of the flame tube, the swirler mounting hole is used for mounting a swirler, the number of the swirler mounting holes is 10-24, and the hole diameter ranges from 30 mm to 45 mm;

[0010] The fixing pin mounting seat is used for mounting a fixing pin, and the number of the fixing pin mounting seats is 6-12;

[0011] The head ring of the flame tube is connected with an outer casing of a combustion chamber through the fixing pin.

[0012] Further, the elastic supporting ring comprises cooling holes on the outer side, mounting holes on the inner side and a first bending elastic structure in the middle;

[0013] The cooling holes are in a beveling state, the diameter is 0.5-1.5 mm, and the number is 180-360;

[0014] The diameter of the mounting holes is 4-12 mm, and the number is 10-36;

[0015] The first bending elastic structure comprises W, N, V and Z structure forms.

[0016] Further, the elastic supporting ring comprises an inner ring elastic supporting ring arranged on the inner side of the inner ring of the flame tube and an outer ring elastic supporting ring arranged on the outer side of the outer ring of the flame tube.

[0017] Further, the inner ring and the outer ring of the flame tube are both annular cylinder structures and are formed by integral weaving, and the thickness ranges from 2 mm to 6 mm;

[0018] The flame tube outer ring and the flame tube inner ring are provided with a plurality of openings at the connection position with the flame tube head ring; the number of the openings is 10-36, the aperture range is 10-20 mm, and the opening shape includes a round hole and a waist-shaped hole.

[0019] Further, the flexible connection structure assembly is provided in plurality and arranged on the flame tube outer ring and the flame tube inner ring;

[0020] The flexible connection structure assembly includes a fixing bolt embedded in the mounting hole and a fixing nut mounted in the inner and outer channels, and the fixing bolt cooperates with the fixing nut;

[0021] The flexible connection structure assembly further includes an external support spring arranged above the outer ring elastic support ring, an internal support spring arranged below the outer ring elastic support ring, and a multidirectional elastic support structure arranged between the flame tube outer ring and the flame tube inner ring.

[0022] Further, the multidirectional elastic support structure is made of high-temperature alloy material and includes a fixing bolt mounting hole, a lower end support spring and a peripheral support spring;

[0023] The fixing bolt mounting hole is matched with the fixing bolt and has an aperture range of 4-10 mm;

[0024] The peripheral support spring includes W, N and L structures and is in contact with the flame tube outer ring and the flame tube inner ring;

[0025] The lower end support spring includes V and W forms and is in contact with the flame tube outer ring and the flame tube inner ring.

[0026] Further, the upper end of the outer ring outlet support is connected with one end of the flame tube outer ring outlet;

[0027] The upper end of the inner ring outlet support is connected with one end of the flame tube inner ring outlet.

[0028] Further, the outlet elastic support ring includes N and W forms and has a wall thickness of 0.5-1.0 mm;

[0029] The outlet elastic support ring includes a second curved elastic structure and a flange edge mounting hole, and the flange edge mounting hole is used for mounting the outlet elastic support ring on the flame tube outer ring;

[0030] The second curved elastic structure includes W, N, V and Z structure forms;

[0031] The outlet elastic support ring is further provided with a stable pressure inlet hole, and the stable pressure inlet hole has an aperture range of 0.5-3.0 mm.

[0032] Further, the elastic sealing ring comprises W, N, V structure, the wall thickness is 0.3-1.0mm; one end of the elastic sealing ring is in contact with the flame tube outer ring, and the other end is overlapped to the outer ring outlet support;

[0033] The elastic ring is made of high-temperature alloy material, and the width is 4-8mm.

[0034] The beneficial effects of the present application are as follows:

[0035] The present application adopts various elastic connection structures between the inner and outer rings of the non-metallic composite material flame tube and the head ring of the metal material flame tube, changes the thermal matching deformation into elastic matching, has good thermal expansion matching performance, good sealing performance and assembly performance, can maintain good sealing performance under hot state, effectively reduces the air leakage problem of the flame tube caused by the mismatch of thermal expansion amount. The elastic connection structure of the inner and outer rings of the flame tube can effectively disperse the axial and circumferential stress, reduce the stress concentration of the non-metallic composite material, reduce the risk of damage caused by uneven stress of the matrix, and increase the service life of the non-metallic material flame tube. At the same time, the detachable structure design of the present application can effectively improve the maintainability of the flame tube, reduce the maintenance cost, and has high engineering application value.

[0036] Other features and advantages of the present application will be set forth in the following description, and in part will become apparent to those skilled in the art from the description, or can be learned by practice of the present application. The objects and other advantages of the present application can be achieved and obtained by the structures indicated in the specification, claims and drawings. BRIEF DESCRIPTION OF DRAWINGS

[0037] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.

[0038] FIG. 1A The cross-sectional schematic diagram of the non-metallic composite material combustion chamber flame tube based on the elastic connection structure in the embodiment of the present application is shown;

[0039] FIG. 1B The three-dimensional structure schematic diagram of the non-metallic composite material combustion chamber flame tube based on the elastic connection structure in the embodiment of the present application is shown;

[0040] FIG. 2 The structure schematic diagram of the non-metallic composite material flame tube in the embodiment of the present application is shown;

[0041] FIG. 3A 、 3BThe structural schematic diagram of the outer elastic support ring in the embodiment of the application is shown.

[0042] FIG. 4A The structural schematic diagram of the outer elastic support ring in the embodiment of the application is shown. FIG. 1A The enlarged schematic diagram of the flexible connecting structure assembly 6 is shown.

[0043] FIG. 4B The structural schematic diagram of the outer elastic support ring in the embodiment of the application is shown. FIG. 1B The enlarged schematic diagram of the flexible connecting structure assembly 6 is shown.

[0044] FIG. 5 The structural schematic diagram of the outer elastic support ring in the embodiment of the application is shown.

[0045] FIG. 6A The sectional schematic diagram of the multidirectional elastic support structure in the embodiment of the application is shown.

[0046] FIG. 6B The planar schematic diagram of the multidirectional elastic support structure in the embodiment of the application is shown.

[0047] FIG. 6C The three-dimensional structural schematic diagram of the multidirectional elastic support structure in the embodiment of the application is shown.

[0048] FIG. 7A 、 7B The structural schematic diagram of the outer elastic support ring in the embodiment of the application is shown.

[0049] FIG. 8 The structural schematic diagram of the outer elastic support ring in the embodiment of the application is shown. FIG. 1B The enlarged schematic diagram of the flexible connecting structure assembly 6 is shown.

[0050] In the figure, 1, diffuser; 2, fixing pin; 3, combustion chamber outer casing; 4, cap cover; 5, outer elastic support ring; 5-1, cooling hole; 5-2, first curved elastic structure; 5-3, mounting hole; 6, flexible connecting structure assembly; 6-1, fixing bolt; 6-2, fixing nut; 6-3, external support spring; 6-4, internal support spring; 6-5, multidirectional elastic support structure; 6-5-1, fixing bolt mounting hole; 6-5-2, lower end support spring piece; 6-5-3, peripheral support spring piece; 7, swirler; 8, inner elastic support ring; 9, flame tube head ring; 10, flame tube outer ring; 11, flame tube inner ring; 12, combustion chamber inner casing; 13, outlet elastic support ring; 13-1, second curved elastic structure; 13-2, stable pressure air inlet hole; 13-3, flange edge mounting hole; 14, outer ring outlet support; 15, elastic sealing ring; 16, inner ring outlet support; 17, elastic expansion ring. DETAILED DESCRIPTION

[0051] In order to make the purposes, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0052] The present application provides a non-metallic composite combustion chamber flame tube based on an elastic connection structure to solve the problems of gas leakage and extrusion stress damage of the flame tube caused by the inconsistent thermal expansion matching of the non-metallic composite material and the metal material. In the present application, the non-metallic composite material is not limited, including but not limited to SiCf / SiC ceramic matrix composite material.

[0053] As shown in FIG. 1A-1B The non-metallic composite combustion chamber flame tube includes a diffuser 1 connected with a combustion chamber outer casing 3 through a fixing pin 2, the combustion chamber outer casing 3 is internally provided with a flame tube, the flame tube includes a flame tube head ring 9 of metal material and a flame tube inner ring 11 and a flame tube outer ring 10 of non-metallic composite material connected with one end of the flame tube head ring 9, the other end of the flame tube head ring 9, i.e. the end close to the diffuser 1, is installed with a cap cover 4, a swirl generator 7 is installed inside the flame tube head ring 9, the diffuser 1 is used for decelerating and pressurizing the high-temperature and high-pressure gas entering the combustion chamber, and the cap cover 4 is used for straightening the gas after deceleration and pressurization. The flame tube head ring 9, the flame tube outer ring 10 and the flame tube inner ring 11 are connected through a flexible connection structure assembly 6, one end of the flexible connection structure assembly 6 is connected with the flame tube outer ring 10 and the flame tube inner ring 11, and the other end is connected with the flame tube head ring 9. An outlet elastic support ring 13 and an outer ring outlet support 14 are arranged at the outlet of the flame tube outer ring 10, an elastic sealing ring 15 is arranged between the outlet elastic support ring 13 and the outer ring outlet support 14, an inner ring outlet support 16 is arranged at the outlet position of the flame tube inner ring 11, an elastic expansion ring 17 is arranged between the inner ring outlet support 16 and the flame tube inner ring 11, and the other end of the inner ring outlet support 16 is connected with a combustion chamber inner casing 12.

[0054] As shown in FIG. 2As shown, the flame tube head ring 9 is a ring structure, and swirler mounting holes are formed on the flame tube head ring 9 for mounting the swirler 7. The number of the swirler mounting holes is 10-24, and the hole diameter ranges from 30 to 45 mm. The flame tube head ring 9 is further provided with a fixed pin mounting seat for mounting the fixed pin 2. The number of the fixed pin mounting seat is 6-12. The flame tube head ring 9 is connected with the combustion chamber outer casing 3 through the fixed pin 2 for fixing the flame tube. The outer side of the flame tube outer ring 10 is provided with an outer ring elastic support ring 5, and the inner side of the flame tube inner ring 11 is provided with an inner ring elastic support ring 8. The structure of the inner ring elastic support ring 8 and the outer ring elastic support ring 5 is a flexible elastic structure, which has a certain elastic support effect in a high temperature environment. The inner ring elastic support ring 8 and the outer ring elastic support ring 5 are both thin-walled pieces of high-temperature alloy material, and the wall thickness ranges from 0.3 to 0.5 mm. FIG. 3A and 3B As shown, the outer ring elastic support ring 5 is taken as an example to introduce the inner / outer ring elastic support ring. The outer ring elastic support ring 5 includes cooling holes 5-1 on the outer side, mounting holes 5-3 on the inner side, and a first curved elastic structure 5-2 in the middle. The cooling holes 5-1 are designed in a beveled state, and the diameter of the cooling holes 5-1 is 0.5-1.5 mm. The number of the cooling holes 5-1 is 180-360, which is used for cooling the flame tube head ring 9. The form of the first curved elastic structure 5-2 can be W, N, V, Z, etc., which is not limited to the Z-shaped structure shown in the figure. The diameter of the mounting holes 5-3 is 4-12 mm, and the number of the mounting holes 5-3 is 10-36. The structure of the inner ring elastic support ring 8 is the same as that of the outer ring elastic support ring 5, and the corresponding cooling holes, mounting holes and first curved elastic structure are also provided, which will not be described in detail here.

[0055] The flame tube outer ring 10 and the flame tube inner ring 11 are ring cylinder structures, which are formed by integral knitting. The thickness ranges from 2 to 6 mm. A plurality of openings are arranged at the connection position of the flame tube head ring 9. The number of the openings is 10-36, the hole diameter ranges from 10 to 20 mm, and the shape of the openings is a round hole or a waist-shaped hole, etc. The form and size are not limited to the structure shown in the figure, which is used for mounting the flexible connection structure assembly 6.

[0056] A plurality of flexible connection structure assemblies 6 are arranged on the flame tube outer ring 10 and the flame tube inner ring 11, respectively, which are used for connecting the metal flame tube head ring 9 and the non-metal composite material flame tube inner / outer ring, realizing the sealing and assembly of the connection of the two materials in cold and hot states. FIG. 4A and 4BAs shown, the flexible connection structure assembly 6 includes a fixing bolt 6-1 embedded in the mounting hole 5-3, which cooperates with a fixing nut 6-2 without affecting the internal flow field of the flame tube, and the fixing nut 6-2 is installed in the inner and outer two passages formed by the flame tube inner ring 11 and the flame tube outer ring 10 and the combustor outer casing 3. The flexible connection structure assembly 6 further includes an external support spring 6-3 arranged above the outer ring elastic support ring 5, an internal support spring 6-4 arranged below the outer ring elastic support ring 5, and a multidirectional elastic support structure 6-5 arranged between the flame tube outer ring 10 and the flame tube inner ring 11. The fixing bolt 6-1 in the embodiment adopts an inner cross structure as shown in FIG. 5 , the fixing nut is M4-M10, which is convenient for assembly and fixing. As shown in FIG. 6A , 6B and 6C, the multidirectional elastic support structure 6-5 adopts a high-temperature alloy material, specifically including a fixing bolt mounting hole 6-5-1, a lower end support spring 6-5-2, and a peripheral support spring 6-5-3. The fixing bolt mounting hole 6-5-1 matches the fixing bolt 6-1, and the hole diameter ranges from 4 to 10 mm; the peripheral support spring 6-5-3 adopts a W, N, L, etc. form structure, which is in contact with the flame tube outer ring 10 and the flame tube inner ring 11 to disperse the stress; and the lower end support spring 6-5-2 adopts a V, W, etc. form structure, which is in contact with the flame tube outer ring 10 and the flame tube inner ring 11.

[0057] The outlet position of the flame tube outer ring 10 is provided with an outer ring outlet support 14 and an outlet elastic support ring 13, wherein the end of the flame tube outer ring 10 away from the diffuser 1 is overlapped to the upper end of the outer ring outlet support 14, and an elastic sealing ring 15 is installed between the outlet elastic support ring 13 and the outer ring outlet support 14 for sealing. The outlet elastic support ring 13 and the elastic sealing ring 15 both adopt a high-temperature alloy material and an initial design pre-tightening force, which can effectively offset the change in hot-state metal expansion amount. The structure of the outlet elastic support ring 13 can be an N, W, etc. structure form, and the wall thickness is 0.5-1.0 mm. In some embodiments of the present application, the structure of the outlet elastic support ring 13 is as shown in FIG. 7A and 7B , the outlet elastic support ring 13 includes a second curved elastic structure 13-1 and a flange edge mounting hole 13-3, and the flange edge mounting hole 13-3 is used to install the outlet elastic support ring 13 on the flame tube outer ring 10. The outlet elastic support ring 13 is also provided with a pressure stabilizing inlet hole 13-2, and the hole diameter ranges from 0.5 to 3.0 mm. As shown in FIG. 8 , the structure of the elastic sealing ring 15 is a W, N, V, etc. structure form, and the wall thickness is 0.3-1.0 mm, one end of the elastic sealing ring 15 is in contact with the flame tube outer ring 10, and the other end is overlapped to the outer ring outlet support 14.

[0058] The elastic ring 17 is arranged at the outlet position of the flame tube inner ring 11, the inner ring outlet support 16 is arranged at the end of the flame tube inner ring 11 away from the diffuser 1, a large gap structure is adopted between the inner ring outlet support 16 and the elastic ring 17, the elastic ring 17 is made of high-temperature alloy material, the width is 4-8 mm, the diameter is matched with the engine, and the outlet position of the flame tube inner ring 11 is expanded to seal under the hot state.

[0059] The working mode of the present application and the change performance of different parts are described below.

[0060] The direct-flow combustion chamber inlet airflow is high-temperature and high-pressure air, which is slowed down and pressurized through the diffuser 1, rectified by the cap cover 4 into three air flows, namely the outer airflow, the middle airflow and the inner airflow. Among them, the outer airflow flows through the combustion chamber outer casing 3, enters the flame tube through the wall main combustion hole, the mixing hole on the flame tube outer ring 10 of the non-metal composite material and the cooling hole of the flame tube inner and outer ring (not shown in the figure), and participates in organizing combustion; the middle airflow passes through the swirler 7 into the flame tube, participates in ignition, extinguishing and organizing combustion; the inner airflow flows through the combustion chamber inner casing 12, enters the flame tube through the wall main combustion hole, the mixing hole on the flame tube inner ring 11 and the cooling hole of the flame tube inner and outer ring, and participates in organizing combustion, the high-temperature gas with a temperature as high as 2000k is formed in the flame tube, and a large temperature difference is formed between the gas flows in the inner and outer two channels, the difference between the linear expansion coefficients of the non-metal composite material and the metal material is large, which easily causes the connection structure of the two materials to be not matched with the thermal expansion amount, and since the flame tube outer ring 10 is a non-metal composite material, it cannot bear the positioning structure of the fixed pin 2.

[0061] Based on this problem, the flame tube head ring 9 of metal material is adopted in the present application, the fixed pin mounting seat of metal material is arranged on the flame tube head ring 9, the fixed pin mounting seat and the fixed pin 2 are connected to the combustion chamber outer casing 3. The inner ring elastic support ring 8 and the outer ring elastic support ring 5 installed on the inner and outer sides of the flame tube head ring 9 are both designed to have a bending elastic structure, have strong elastic deformation capacity, and the cooling holes opened can be used to cool the outer ring elastic support ring 5 and the inner ring elastic support ring 8.

[0062] Under the hot state, the flame tube outer ring 10, the flame tube inner ring 11 and the flame tube head ring 9 will all expand outward, but the linear expansion coefficient of the non-metal composite material flame tube outer ring 10 and the flame tube inner ring 11 is small, and the expansion amount is small, while the expansion amount of the metal flame tube head ring 9 is large, causing the outer ring elastic support ring 5 to be subjected to tensile force and the inner ring elastic support ring 8 to be subjected to pressure, and the stress of the two places is transmitted to the flexible connection structure assembly 6 of the flame tube inner and outer ring. Since the flexible connection structure assembly 6 is embedded in the flame tube inner and outer ring mounting hole 5-3, the interference of the connection structure on the internal flow field of the flame tube is effectively reduced.

[0063] Take the force analysis of the outer ring of the flame tube as an example, the elastic support ring 5 expands upward, extruding the external support spring 6-3, which is limited by the fixed nut 6-2, the fixed nut 6-2 transmits force to the fixed bolt 6-1, the fixed bolt 6-1 extrudes the internal support spring 6-4, the internal support spring 6-4 extrudes the multi-directional elastic support structure 6-5, and the upward tension is obtained. The multi-directional elastic support structure 6-5 is subjected to upward tension, the lower end support spring 6-5-2 is in contact with the outer ring 10 of the flame tube and is subjected to force, the force is evenly distributed on the lower end support spring 6-5-2, and the force area is large, so that the outer ring 10 of the flame tube is not easily damaged. In addition, the four peripheral support springs 6-5-3 are in contact with the mounting holes 5-3 of the outer ring 10 of the flame tube and are subjected to force, the force direction is axial and circumferential force, and the four peripheral support springs 6-5-3 have a certain elasticity and can release stress to a certain extent.

[0064] For the outlet position of the outer ring 10 of the flame tube, the outlet elastic support ring 13 is provided with an initial pre-tightening force, which gives the outer ring 10 of the flame tube a downward force and a compression amount, and the curved elastic structure 13-1 has a large elasticity. In the hot state, the outlet elastic support ring 13 of the metal material has a large expansion amount, but the initial pre-tightening force and the compression amount offset the thermal expansion amount difference to a certain extent, thereby ensuring good contact. The outer ring 10 of the flame tube and the outer ring outlet support 14 are sealed by the elastic sealing ring 15, and an initial compression amount is designed and the left end is overlapped on the upper end of the outer ring outlet support 14, thereby ensuring good sealing performance in the hot state.

[0065] For the outlet position of the inner ring 11 of the flame tube, in the hot state, the elastic expansion ring 17 and the inner ring outlet support 16 of the metal material have a large expansion amount, and the elastic expansion ring 17 is tightly attached to the inner ring 11 of the flame tube after expansion, thereby further playing a good sealing and supporting role.

[0066] The present application connects the inner and outer rings of the flame tube of the non-metallic composite material and the head ring 9 of the flame tube of the metal material based on the elastic connection structure, and connects the non-metallic composite material and the metal material by using various elastic structures such as elastic support rings, spring supports, multi-directional spring structures, and expansion rings. In the cold state, the present application has good assembly performance, and in the hot state, the sealing performance of the inner and outer rings of the flame tube is good, the thermal matching deformation is replaced by elastic matching, and the leakage problem of the flame tube caused by the mismatch of the thermal expansion amount is effectively reduced. The elastic connection structure in the non-metallic composite material flame tube can effectively disperse the axial and circumferential stress, reduce the stress concentration of the non-metallic composite material, reduce the risk of damage caused by uneven stress of the substrate, and increase the service life of the non-metallic material flame tube. At the same time, the present application is designed as a detachable structure, which effectively improves the maintainability of the flame tube, reduces the maintenance cost, and has high engineering application value.

[0067] Although the present application has been described in detail with reference to the foregoing embodiments, it should be understood that modifications can be made to the foregoing embodiments, or additional implementations can be implemented, without departing from the spirit and scope of the inventive subject matter. Accordingly, the present application is not limited to the implementations described herein, but is intended to be defined by the claims set forth below, and equivalents thereof.

Claims

1. A non-metallic composite combustion chamber flame tube based on an elastic connection structure, characterized in that The flame tube inner ring (11) and the flame tube outer ring (10) comprising non-metallic composite material, and the flame tube head ring (9) of metal material; the flexible connection structure assembly (6) is arranged on the flame tube inner ring (11) and the flame tube outer ring (10) for being connected with the flame tube head ring (9); The connecting place of the flame tube outer ring (10) and the flame tube inner ring (11) and the flexible connection structure assembly (6) is provided with an elastic support ring; the elastic support ring comprises cooling holes (5-1) on the outer side, mounting holes (5-3) on the inner side and a first curved elastic structure (5-2) in the middle; the cooling holes (5-1) are in a bevelled state; the flexible connection structure assembly (6) comprises a fixed bolt (6-1) embedded in the mounting hole (5-3) and a fixed nut (6-2) mounted in the inner and outer two channels, and the fixed bolt (6-1) cooperates with the fixed nut (6-2); the flexible connection structure assembly (6) further comprises an external supporting spring (6-3) arranged above the outer ring elastic support ring (5) and an internal supporting spring (6-4) arranged below the outer ring elastic support ring (5) and a multidirectional elastic support structure (6-5) arranged between the flame tube outer ring (10) and the flame tube inner ring (11); The outlet position of the flame tube outer ring (10) is provided with an outer ring outlet support (14) and an outlet elastic support ring (13), and an elastic sealing ring (15) is mounted between the outlet elastic support ring (13) and the outer ring outlet support (14); the outlet elastic support ring (13) comprises a second curved elastic structure (13-1) and a flange edge mounting hole (13-3), and the flange edge mounting hole (13-3) is used for mounting the outlet elastic support ring (13) on the flame tube outer ring (10); the outlet elastic support ring (13) is further provided with a stable pressure inlet hole (13-2); The outlet position of the flame tube inner ring (11) is provided with an inner ring outlet support (16), and an elastic ring (17) is arranged between the inner ring outlet support (16) and the flame tube inner ring (11).

2. The non-metallic composite material combustion chamber flame tube based on the elastic connection structure according to claim 1, wherein A swirl generator mounting hole and a fixed pin mounting seat are arranged on the flame tube head ring (9), the swirl generator mounting hole is used for mounting a swirl generator (7), the number of the swirl generator mounting hole is 10-24, and the hole diameter ranges from 30 to 45 mm; The fixed pin mounting seat is used for mounting a fixed pin (2), and the number of the fixed pin mounting seat is 6-12; The flame tube head ring (9) is connected with a combustion chamber outer casing (3) through the fixed pin (2).

3. The non-metallic composite material combustion chamber flame tube based on the elastic connection structure according to claim 1, wherein The diameter of the cooling hole (5-1) is 0.5-1.5 mm, and the number of the cooling hole (5-1) is 180-360; The diameter of the mounting hole (5-3) is 4-12 mm, and the number of the mounting hole (5-3) is 10-36; The first curved elastic structure (5-2) comprises W, N, V and Z structure forms.

4. The non-metallic composite combustion chamber flame tube based on the elastic connecting structure according to claim 1 or 3, characterized in that the elastic support ring comprises an inner ring elastic support ring (8) arranged inside the inner ring (11) of the flame tube and an outer ring elastic support ring (5) arranged outside the outer ring (10) of the flame tube.

5. The non-metallic composite combustion chamber flame tube based on the elastic connecting structure according to claim 1, characterized in that the outer ring (10) and the inner ring (11) of the flame tube are both annular cylinder structures, and are formed by integral weaving, with a thickness ranging from 2 to 6 mm.

6. The non-metallic composite combustion chamber flame tube based on the elastic connecting structure according to claim 5, characterized in that the flexible connecting structure assembly (6) is arranged in multiple.

7. The non-metallic composite combustion chamber flame tube based on the elastic connecting structure according to claim 6, characterized in that the multi-directional elastic support structure (6-5) is made of high-temperature alloy material, and comprises a fixed bolt mounting hole (6-5-1), a lower end support spring (6-5-2) and a peripheral support spring (6-5-3).

8. The non-metallic composite combustion chamber flame tube based on the elastic connecting structure according to claim 1, characterized in that the upper end of the outer ring outlet support (14) is connected to one end of the outlet of the outer ring (10) of the flame tube, and the upper end of the inner ring outlet support (16) is connected to one end of the outlet of the inner ring (11) of the flame tube.

9. The non-metallic composite combustion chamber flame tube based on the elastic connecting structure according to claim 1, characterized in that the outlet elastic support ring (13) comprises N and W forms, with a wall thickness of 0.5 to 1.0 mm.

10. The non-metallic composite combustion chamber flame tube based on the elastic connecting structure according to claim 1, characterized in that the elastic sealing ring (15) comprises W, N and V structures, with a wall thickness of 0.3 to 1.0 mm, one end of the elastic sealing ring (15) is in contact with the outer ring (10) of the flame tube, and the other end is overlapped to the outer ring outlet support (14), and the elastic expansion ring (17) is made of high-temperature alloy material, with a width of 4 to 8 mm. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

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