Ignition electrode mounting structure and combustion chamber

Abstract

The application discloses an igniter tip mounting structure and a combustion chamber, and relates to the technical field of aero-engines. The igniter tip mounting structure comprises an igniter tip, an igniter tip mounting seat and an elastic element. The first end of the igniter tip mounting seat is connected with a combustion chamber casing, the second end of the igniter tip mounting seat is abutted with an outer ring of a flame tube, the second end is movable along the axial direction of the igniter tip relative to the first end, the igniter tip mounting seat is provided with an igniter tip mounting hole which is communicated with the combustion chamber casing and the outer ring of the flame tube, the igniter tip is movably mounted in the igniter tip mounting hole through the elastic element, one end of the elastic element is connected with the first end, and the other end is connected with the second end through the igniter tip. In the working state, the protruding amount of the igniter tip relative to the outer ring of the flame tube is basically unchanged, which is beneficial to improving the high-altitude re-ignition performance and improving the sealing performance between the igniter tip and the combustion chamber casing.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of aero-engine, in particular to an ignition electrode mounting structure and a combustion chamber. BACKGROUND

[0002] The aero-engine combustion chamber structure is a full annular combustion chamber structure, mainly comprising a combustion chamber outer casing, a combustion chamber diffuser, an inner casing, a fuel nozzle and a flame tube. When the engine is working, high-temperature compressed air enters the flame tube from the diffuser, and the fuel nozzle sprays fuel into the flame tube, and the fuel mixes with air in the flame tube for combustion, which causes the flame tube wall to be in a high-temperature working environment.

[0003] The flame tube of the current mainstream engine is made of high-temperature alloy material, and the long-term permissible temperature is below 1000℃, so a large amount of cooling air is needed to cool the wall surface. With the increasing requirement for engine thrust, the temperature that the flame tube needs to withstand gradually increases, and the high-temperature alloy cannot meet the corresponding environmental use requirements. Therefore, it is necessary to consider developing ceramic matrix composite (CMC) with higher temperature resistance. f As a kind of ceramic matrix composite, SiC / SiC composite material has the advantages of high-temperature resistance, low density (about 1 / 3 of high-temperature alloy), high specific strength, high modulus, oxidation resistance, ablation resistance, and relative insensitivity to cracks, and the long-term permissible temperature can reach 1200℃. As a combustion chamber flame tube structural material of a gas turbine engine, it can greatly reduce the amount of cooling gas, improve the efficiency of the engine, and has great potential to reduce the weight of the engine.

[0004] In the combustion chamber component, the ignition electrode extends into the flame tube from the combustion chamber casing, passes through the combustion chamber outer casing, the combustion chamber outer ring cavity and the flame tube outer ring wall, and performs ignition. For the traditional flame tube made of high-temperature resistant alloy material, the current installation sealing structure at this position is to weld a floating sleeve on the metal flame tube outer ring, and connect the ignition electrode to the mounting seat of the casing by a threaded connection. However, for the CMC flame tube, metal structural material cannot be welded on the flame tube outer ring, and because the expansion coefficient of CMC material is much smaller than that of metal material, the radial deformation of the casing is much larger than that of the flame tube outer ring in the working state. If the ignition electrode is directly connected to the mounting seat of the casing, the extension amount of the ignition electrode relative to the flame tube outer ring will change greatly, which may affect the high-altitude re-ignition performance. SUMMARY

[0005] The technical problem to be solved by the present application is to overcome the defects that the CMC flame tube cannot be welded with metal material and the expansion coefficients of the CMC flame tube and the casing are different, resulting in a large change in the extension amount of the ignition electrode relative to the flame tube outer ring, and to provide an ignition electrode mounting structure and a combustion chamber.

[0006] The present application solves the above technical problems by the following technical scheme:

[0007] The igniter tip mounting structure comprises an igniter tip, an igniter tip mounting seat and an elastic element.

[0008] The first end of the igniter tip mounting seat is connected with a combustion chamber case, the second end of the igniter tip mounting seat is abutted with an outer ring of a flame tube, the second end is movable along the axial direction of the igniter tip relative to the first end, and the igniter tip mounting seat is provided with an igniter tip mounting hole which is in communication with the combustion chamber case and the outer ring of the flame tube.

[0009] The igniter tip is movably mounted in the igniter tip mounting hole through the elastic element.

[0010] One end of the elastic element is connected with the first end, the other end is connected with the second end through the igniter tip, the elastic element is in a compressed state after the igniter tip is mounted, the elastic element presses the outer ring of the flame tube by extruding the igniter tip, and the compression amount of the elastic element is greater than the radial relative deformation amount of the combustion chamber case and the outer ring of the flame tube in the working state.

[0011] In the present scheme, the second end of the igniter tip mounting seat is movable along the axial direction of the igniter tip relative to the first end, which can adapt to the deformation of the combustion chamber case and the outer ring of the flame tube caused by thermal expansion in the working state; the igniter tip is movably mounted in the igniter tip mounting hole through the elastic element, in the working state, the combustion chamber case and the outer ring of the flame tube are deformed, the igniter tip can move along the axial direction of the igniter tip under the action of the elastic element, which offsets the position change caused by the deformation of the combustion chamber case and the outer ring of the flame tube, so that the extension amount of the igniter tip relative to the outer ring of the flame tube can be basically maintained unchanged, which is beneficial to improving the high-altitude re-ignition performance; the elastic element presses the outer ring of the flame tube by extruding the igniter tip, which can prevent gas from leaking out between the igniter tip mounting seat and the igniter tip, and is beneficial to improving the sealing performance between the igniter tip and the combustion chamber case; the compression amount of the elastic element is greater than the radial relative deformation amount of the combustion chamber case and the outer ring of the flame tube in the working state, which can always press the outer ring of the flame tube with the second end, thereby enhancing the sealing performance.

[0012] Preferably, the igniter tip mounting seat comprises:

[0013] An end cover is arranged at the first end, and the elastic element is arranged in the accommodating cavity in the end cover.

[0014] A support device is fixed to the combustion chamber casing at one end with the end cover and is arranged at the second end.

[0015] In this scheme, the end cover provides a space for the elastic element, and enhances the sealing between the ignition electrode and the combustion chamber casing. The arrangement of the support device facilitates the installation of the ignition electrode.

[0016] Preferably, the support device comprises:

[0017] A support body comprising a first cylinder, a first connecting part and a base, the first cylinder is connected with the ignition electrode by screw thread, the first cylinder is connected with the base through the first connecting part, and the base is connected with the outer ring of the flame tube;

[0018] A body sleeve comprising a second connecting part and a second cylinder, the second connecting part is connected with the end cover and is fixed to the combustion chamber casing together with the end cover, the second cylinder is arranged outside the first cylinder, and the second cylinder is arranged in the electrode mounting hole of the electrode mounting seat of the combustion chamber casing;

[0019] The support body is movable relative to the second cylinder along the axis direction of the ignition electrode.

[0020] In this scheme, the first cylinder in the support body is connected with the ignition electrode by screw thread, the support body can move with the movement of the ignition electrode, the support body provides a mounting space for the fixation of the ignition electrode, the support body is installed on the electrode mounting seat through the body sleeve, and the body sleeve is conducive to reducing the gap between the electrode mounting hole and the first cylinder, for axial positioning of the ignition electrode, and can reduce the fluctuation caused by vibration.

[0021] Preferably, the base is provided with a cooling hole near the position of the ignition electrode.

[0022] In this scheme, through the cooling hole, the annular cavity airflow can cool the bottom of the ignition electrode, thereby improving the service life of the ignition electrode.

[0023] Preferably, the end cover and the second connecting part are fixed on the combustion chamber casing by bolts.

[0024] In this scheme, the connection is simple and reliable, and the sealing between the ignition electrode mounting structure and the combustion chamber is enhanced.

[0025] Preferably, the ignition electrode is provided with an outer protruding part, and the other end of the elastic element abuts against the outer protruding part.

[0026] In the scheme, the outer convex part provides a contact surface for the abutment between the elastic element and the ignition electrode, and the connection between the elastic element and the ignition electrode is more reliable.

[0027] Preferably, a gasket is arranged at the end of the elastic element away from the outer convex part, and the gasket is used to control the extension amount of the ignition electrode at the outer ring of the flame tube.

[0028] In the scheme, the extension amount of the ignition electrode at the outer ring of the flame tube can be controlled by controlling the thickness of the gasket.

[0029] Preferably, the elastic element is arranged outside the combustion chamber case.

[0030] In the scheme, the elastic element is away from the high-temperature gas, and the creep damage of the elastic element caused by high temperature can be reduced.

[0031] Preferably, the elastic element is a wave spring.

[0032] In the scheme, the wave spring is used to improve the sealing between the ignition electrode and the case.

[0033] Preferably, the wave spring has a thin-walled cylindrical structure with a corrugated wave shape, the wave spring is arranged around the axis of the ignition electrode, and the wave spring abuts against the inner surface of the first end and the outer circumferential surface of the ignition electrode.

[0034] In the scheme, it is beneficial to prevent gas from leaking out between the ignition electrode and the electrode mounting seat.

[0035] A combustion chamber, comprising a combustion chamber case, a flame tube, and an ignition electrode mounting structure as described above;

[0036] The combustion chamber case is provided with a case electrode mounting seat.

[0037] The flame tube is made of ceramic matrix composite material, and the flame tube comprises a flame tube outer ring, and the flame tube outer ring is provided with a flame tube electrode mounting seat.

[0038] The ignition electrode mounting structure is fixed on the case electrode mounting seat and the flame tube electrode mounting seat.

[0039] In the present scheme, the ceramic matrix composite flame tube can greatly reduce the amount of cooling gas, improve the engine efficiency, and has great potential to reduce the weight of the engine. Meanwhile, the above-mentioned ignition electrode mounting structure can overcome the defect that the radial deformation of the combustion chamber case is much larger than the radial deformation of the outer ring of the flame tube in the working state due to the fact that the expansion coefficient of the ceramic matrix composite material is much smaller than the expansion coefficient of the metal material. If the ignition electrode is directly connected to the case mounting seat, the protruding amount of the ignition electrode relative to the outer ring of the flame tube will change greatly. Through the above-mentioned ignition electrode mounting structure, the protruding amount of the ignition electrode relative to the outer ring of the flame tube is basically unchanged.

[0040] Preferably, the thickness at the flame tube electrode mounting seat is greater than the thickness of the rest of the flame tube.

[0041] In the present scheme, the strength of the flame tube electrode mounting seat can be improved

[0042] Preferably, the flame tube electrode mounting seat comprises a flame tube electrode mounting hole, and the flame tube electrode mounting hole is provided with a gap with the ignition electrode.

[0043] In the present scheme, in the working state, the ignition electrode will not be strained due to the different axial thermal deformations of the combustion chamber case and the flame tube.

[0044] The positive progress effect of the present application is that in the present application, the second end of the electrode mounting seat is movable relative to the first end in the axial direction of the ignition electrode, which can adapt to the deformation of the combustion chamber case and the outer ring of the flame tube caused by thermal expansion in the working state. The ignition electrode is mounted in the ignition electrode mounting hole through the elastic element, and in the working state, the combustion chamber case and the outer ring of the flame tube are deformed, and the ignition electrode can move along the axial direction of the ignition electrode under the action of the elastic element, which can offset the position change caused by the deformation of the combustion chamber case and the outer ring of the flame tube, so as to keep the protruding amount of the ignition electrode relative to the outer ring of the flame tube basically unchanged, which is beneficial to improve the high-altitude reignition performance. The elastic element presses the outer ring of the flame tube by extruding the ignition electrode, which can prevent gas from leaking out between the electrode mounting seat and the ignition electrode, and is beneficial to improve the sealing performance between the ignition electrode and the combustion chamber case. BRIEF DESCRIPTION OF DRAWINGS

[0045] Figure 1 The structure diagram of the ignition electrode mounting structure of a preferred embodiment of the present application;

[0046] Figure 2 The structure diagram of the wave spring in different states of a preferred embodiment of the present application;

[0047] Figure 3 The structure diagram of the combustion chamber of a preferred embodiment of the present application.

[0048] combustion chamber case 101

[0049] ignition electrode 102

[0050] flame tube outer ring 103

[0051] flame tube inner ring 104

[0052] outer cap 105

[0053] inner cap 106

[0054] splash plate 107

[0055] head adapter 108

[0056] support arm 109

[0057] combustion chamber outer ring cavity 110

[0058] combustion chamber inner ring cavity 111

[0059] first connecting portion 202

[0060] main body sleeve 203

[0061] gasket 204

[0062] wave spring 205

[0063] end cap 206

[0064] bolt 207

[0065] case electrode mounting seat 208

[0066] second connecting portion 209

[0067] first cylinder 301

[0068] outer convex portion 302

[0069] second end 303

[0070] case electrode mounting hole 304

[0071] base 305

[0072] flame tube electrode mounting hole 306

[0073] ignition electrode bottom 307

[0074] cooling hole 308

[0075] second cylinder 309

[0076] first end 310

[0077] wave spring before installation 401

[0078] Wave spring 402 after installation DETAILED DESCRIPTION

[0079] The application will be further described by way of example only with reference to the accompanying drawings.

[0080] As Figure 1 and Figure 2 The embodiment provides an igniter tip mounting structure, which comprises an igniter tip 102, an igniter tip mounting seat and an elastic element.

[0081] The first end 310 of the igniter tip mounting seat is connected with the combustion chamber case 101, and the second end 303 of the igniter tip mounting seat is in abutment with the outer ring 103 of the flame tube, the second end 303 is movable along the axial direction of the igniter tip 102 relative to the first end 310, and the igniter tip mounting seat is provided with an igniter tip mounting hole which is in communication with the combustion chamber case 101 and the outer ring 103 of the flame tube.

[0082] The igniter tip 102 is movably mounted in the igniter tip mounting hole through the elastic element.

[0083] One end of the elastic element is connected with the first end 310, and the other end is connected with the second end 303 through the igniter tip 102, the elastic element is in a compressed state after the igniter tip 102 is mounted, the elastic element presses the igniter tip 102 and thus makes the second end 303 press the outer ring 103 of the flame tube, and the compression amount of the elastic element is greater than the radial relative deformation amount of the combustion chamber case 101 and the outer ring 103 of the flame tube in the working state.

[0084] The second end 303 of the electric mouth mounting seat is movable relative to the first end 310 in the axial direction of the ignition electric mouth 102, and can adapt to the deformation of the combustion chamber casing 101 and the outer ring 103 of the flame tube caused by thermal expansion in the working state; the ignition electric mouth 102 is movably mounted in the ignition electric mouth 102 mounting hole through the elastic element, and in the working state, the combustion chamber casing 101 and the outer ring 103 of the flame tube are deformed, the ignition electric mouth 102 can move in the axial direction of the ignition electric mouth 102 under the action of the elastic element, offsetting the position change caused by the deformation of the combustion chamber casing 101 and the outer ring 103 of the flame tube, so that the extension amount of the ignition electric mouth 102 relative to the outer ring 103 of the flame tube can be basically maintained unchanged, which is beneficial to improve the high-altitude reignition performance; the elastic element presses the ignition electric mouth 102 and the second end 303 to tightly press the outer ring 103 of the flame tube, which can prevent gas from leaking out between the electric mouth mounting seat and the ignition electric mouth 102, and is beneficial to improve the sealing performance between the ignition electric mouth 102 and the combustion chamber casing 101; the compression amount of the elastic element is greater than the radial relative deformation amount of the combustion chamber casing 101 and the outer ring 103 of the flame tube in the working state, so that the wave spring 205 still retains a certain elastic pressure in the working state, the second end 303 is always pressed against the outer ring 103 of the flame tube, the sealing performance is enhanced, and the extension amount of the ignition electric mouth 102 can be basically maintained unchanged.

[0085] In the embodiment, the elastic element is a wave spring 205. By using the wave spring 205, the sealing performance between the ignition electric mouth 102 and the casing can be improved.

[0086] In other embodiments, the elastic element can be replaced by other structures with elastic and sealing effects, such as a corrugated spring, a multi-layer wave spring, etc.

[0087] In the embodiment, the wave spring 205 has a thin-walled cylindrical structure with a wavy shape, the wave spring 205 is arranged around the axis of the ignition electric mouth 102, and the inner surface of the first end 310 and the outer surface of the ignition electric mouth 102 are in abutment. This structure is beneficial to prevent gas from leaking out between the ignition electric mouth 102 and the electric mouth mounting seat.

[0088] Specifically, as shown in Figure 2 The height difference Δh between the wave spring 401 before installation and the wave spring 402 after installation is greater than the radial relative deformation amount of the combustion chamber casing 101 and the outer ring 103 of the flame tube in the working state, the wave spring 205 still retains a certain elastic pressure in the working state, the ignition electric mouth 102 and the second end 303 are still fixed on the outer ring 103 of the flame tube, and the extension amount of the ignition electric mouth 102 in the working state can be basically maintained unchanged.

[0089] In the embodiment, the electric mouth mounting seat comprises:

[0090] an end cover 206, the end cover 206 is arranged at the first end 310, and a containing cavity is arranged in the end cover 206, and the elastic element is arranged in the containing cavity. The end cover 206 provides a containing space for the elastic element, and enhances the sealing between the ignition plug 102 and the combustion chamber case 101,

[0091] a support device, one end of the support device is fixed on the combustion chamber case 101 together with the end cover 206, and the other end of the support device is arranged at the second end 303. The arrangement of the support device facilitates the installation of the ignition plug 102.

[0092] Further, the support device comprises:

[0093] a support body, the support body comprises a first cylinder 301, a first connecting part 202 and a base 305, the first cylinder 301 is connected with the ignition plug 102 through threads, the first cylinder 301 is connected with the base 305 through the first connecting part 202, and the base 305 is connected with the flame tube outer ring 103;

[0094] a body sleeve 203, the body sleeve 203 comprises a second connecting part 209 and a second cylinder 309, the second connecting part 209 is connected with the end cover 206 and is fixed on the combustion chamber case 101 together with the end cover 206, and the second cylinder 309 is sleeved outside the first cylinder 301 and arranged in a case plug mounting hole 304 of a case plug mounting seat 208 of the combustion chamber case 101;

[0095] the support body is movable along the axial direction of the ignition plug 102 relative to the second cylinder 309.

[0096] the first cylinder 301 in the support body is connected with the ignition plug 102 through threads, the support body can move along with the movement of the ignition plug 102, the support body provides a mounting space for the fixation of the ignition plug 102, and the support body is mounted on the case plug mounting seat 208 through the body sleeve 203, which is conducive to reducing the gap between the case plug mounting hole 304 and the first cylinder 301, for the axial positioning of the ignition plug 102, and can reduce the fluctuation caused by the shock.

[0097] In the embodiment, the base 305 is provided with a cooling hole 308 close to the position of the ignition plug 102. Through the cooling hole 308, the annular cavity airflow can cool the bottom of the ignition plug 102, thereby improving the service life of the ignition plug 102.

[0098] In the embodiment, the end cover 206 and the second connecting part 209 are fixed on the combustion chamber case 101 through a bolt 207. Through the bolt 207, the connection is simple and reliable, and the sealing between the ignition plug 102 mounting structure and the case is enhanced.

[0099] In other embodiments, the end cover 206 and the second connecting portion 209 can also be connected to the combustion chamber case 101 by welding.

[0100] In the present embodiment, the ignition electrode 102 is provided with an outer protrusion 302, and the other end of the elastic element abuts against the outer protrusion 302. The outer protrusion 302 provides a contact surface for the abutment of the elastic element against the ignition electrode 102, and the connection of the elastic element to the ignition electrode 102 is more reliable.

[0101] In the present embodiment, the outer protrusion 302 is provided with a gasket 204 at the end away from the elastic element, and the gasket 204 is used to control the amount of protrusion of the ignition electrode 102 at the outer ring 103 of the flame tube. By controlling the thickness of the gasket 204, the amount of protrusion of the ignition electrode 102 at the outer ring 103 of the flame tube can be controlled.

[0102] In the present embodiment, the elastic element is arranged outside the combustion chamber case 101. The elastic element is away from the high-temperature gas, and the creep damage of the elastic element due to high temperature can be reduced

[0103] As shown in the drawings, the present embodiment also provides a combustion chamber, which comprises a combustion chamber case 101, a flame tube, and an ignition electrode mounting structure as above; Figure 3 The combustion chamber case 101 is provided with a case electrode mounting seat 208;

[0104] The flame tube is made of ceramic matrix composite material, and the flame tube comprises a flame tube outer ring 103, and the flame tube outer ring 103 is provided with a flame tube electrode mounting seat;

[0105] The ignition electrode mounting structure is fixed on the case electrode mounting seat 208 and the flame tube electrode mounting seat.

[0106] The use of ceramic matrix composite material for the flame tube can greatly reduce the amount of cooling gas, improve engine efficiency, and has great potential to reduce engine weight. At the same time, by using the above-mentioned ignition electrode mounting structure, the defect that the amount of protrusion of the ignition electrode 102 relative to the flame tube outer ring 103 will change greatly due to the fact that the expansion coefficient of the ceramic matrix composite material is much smaller than that of the metal material, and the radial deformation amount of the combustion chamber case 101 is much larger than that of the flame tube outer ring 103 in the working state, if the ignition electrode 102 is directly connected to the case mounting seat, can be overcome. The amount of protrusion of the ignition electrode 102 relative to the flame tube outer ring 103 is basically unchanged.

[0107]

[0108] ​The outer cap 105, the inner cap 106, the splash plate 107 and the head adapter 108, the flame tube outer ring 103 and the flame tube inner ring 104 are connected by bolts to form a flame tube assembly, the outer cap 105 is provided with a support arm 109, the flame tube assembly is connected to the combustion chamber case 101 through the support arm 109, the combustion chamber case 101 and the flame tube outer ring 103 form a combustion chamber outer ring cavity 110, the flame tube inner ring 104 and the outer ring form a combustion chamber inner ring cavity 111, the ignition electrode 102 extends into the combustion chamber inner ring cavity 111 from the outside of the combustion chamber case 101 to ignite. The flame tube outer ring 103 and the flame tube inner ring 104 are made of ceramic matrix composite material, specifically SiC f / SiC composite material, and the remaining parts are made of high-temperature alloy material.

[0109] In this embodiment, the thickness of the flame tube electrode mounting seat is greater than the thickness of the remaining part of the flame tube. The strength of the flame tube electrode mounting seat can be improved.

[0110] In this embodiment, the flame tube electrode mounting seat comprises a flame tube electrode mounting hole 306, and the flame tube electrode mounting hole 306 is provided with a gap with the ignition electrode 102. In the working state, the ignition electrode 102 will not interfere and produce stress due to the difference in axial thermal deformation of the combustion chamber and the flame tube.

[0111] Although the specific embodiments of the present application are described above, those skilled in the art should understand that this is only an example, the protection scope of the present application is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principles and essence of the present application, and these changes and modifications all fall within the protection scope of the present application.

Claims

1. An ignition nozzle mounting structure, characterized in that, It includes: Ignition nozzle, nozzle mounting base, and elastic element; The first end of the ignition nozzle mounting base is connected to the combustion chamber housing, and the second end of the ignition nozzle mounting base abuts against the outer ring of the flame tube. The second end is movable relative to the first end along the axial direction of the ignition nozzle. The ignition nozzle mounting base is provided with an ignition nozzle mounting hole that connects the combustion chamber housing and the outer ring of the flame tube. The ignition nozzle is movably mounted in the ignition nozzle mounting hole via the elastic element; One end of the elastic element is connected to the first end, and the other end is connected to the second end through the ignition nozzle. After the ignition nozzle is installed, the elastic element is in a compressed state. The elastic element compresses the ignition nozzle, thereby causing the second end to press against the outer ring of the flame tube. The compression amount of the elastic element is greater than the radial relative deformation of the combustion chamber casing and the outer ring of the flame tube under working conditions. The electric nozzle mounting base includes: An end cap is disposed at the first end, and a receiving cavity is provided inside the end cap, with the elastic element located inside the receiving cavity; A support device, one end of which is fixed to the combustion chamber casing together with the end cover, and the other end of which is disposed at the second end; The support device includes: The support body includes a first cylinder, a first connecting part, and a base. The first cylinder is threadedly connected to the ignition nozzle, the first cylinder is connected to the base through the first connecting part, and the base is connected to the outer ring of the flame tube. The main body sleeve includes a second connecting part and a second cylindrical body. The second connecting part is connected to the end cover and is fixed together with the end cover to the combustion chamber casing. The second cylindrical body is sleeved outside the first cylindrical body and is disposed in the casing nozzle mounting hole of the casing nozzle mounting seat of the combustion chamber casing. The supporting body is movable relative to the second cylinder along the axis of the ignition nozzle.

2. The ignition nozzle mounting structure as described in claim 1, characterized in that, The base has cooling holes located near the ignition nozzle.

3. The ignition nozzle mounting structure as described in claim 1, characterized in that, The end cap and the second connecting part are fixed to the combustion chamber casing by bolts.

4. The ignition nozzle mounting structure as described in claim 1, characterized in that, The ignition nozzle has an outward protrusion, and the other end of the elastic element abuts against the outward protrusion.

5. The ignition nozzle mounting structure as described in claim 4, characterized in that, A gasket is provided at the end of the protrusion away from the elastic element. The gasket is used to control the amount of the ignition nozzle protruding from the outer ring of the flame tube.

6. The ignition nozzle mounting structure as described in any one of claims 1-5, characterized in that, The elastic element is disposed on the outside of the combustion chamber casing.

7. The ignition nozzle mounting structure as described in any one of claims 1-5, characterized in that, The elastic element is a wave spring.

8. The ignition nozzle mounting structure as described in claim 7, characterized in that, The wave spring has a thin-walled cylindrical structure with a pleated wave shape. The wave spring is arranged around the axis of the ignition nozzle, and the wave spring abuts against the inner surface of the first end and the outer peripheral surface of the ignition nozzle.

9. A combustion chamber, characterized in that, It includes a combustion chamber casing, a flame tube, and an ignition nozzle mounting structure as described in any one of claims 1-8; The combustion chamber casing is equipped with a casing nozzle mounting bracket; The flame tube is made of ceramic matrix composite material, and the flame tube includes an outer ring, on which a flame tube electric nozzle mounting base is provided; The ignition nozzle mounting structure is fixed on the receiver nozzle mounting base and the flame tube nozzle mounting base.

10. The combustion chamber as claimed in claim 9, characterized in that, The thickness at the nozzle mounting base of the flame tube is greater than the thickness of the rest of the flame tube.

11. The combustion chamber as claimed in claim 9, characterized in that, The flame tube electric nozzle mounting base includes a flame tube electric nozzle mounting hole, and a gap is provided between the flame tube electric nozzle mounting hole and the ignition electric nozzle.

Images