Flame tube, combustion chamber and aircraft engine

Abstract

The application provides a flame tube, a combustion chamber and an aero-engine. The flame tube comprises a body and a stop nut. The body is provided with a bolt through hole. The bolt through hole has a first end and a second end. The first end faces a casing or a diffuser, and the second end faces an inner cavity of the flame tube. The body is provided with a stop plate at the second end. One end of the stop nut is clamped in the bolt through hole, and the other end abuts against the stop plate, so as to assemble the body and the outer casing or the diffuser by using a connecting bolt. The flame tube of the application fixes the stop nut on the bolt through hole of the body, avoids the problems of weld quality and uncontrollable special process caused by welding, and has simple structure and convenient assembly.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of aero-engines, in particular to a flame tube, a combustion chamber and an aero-engine. BACKGROUND

[0002] At present, the combustion chamber of a civil aero-engine, especially a civil aero-engine with a large bypass ratio, mostly adopts a front-end cap cover positioning structure. Based on the working principle of the aero-engine, high-pressure gas compressed by a high-pressure compressor is mixed with aviation kerosene flowing into the combustion chamber from a fuel adapter, ignited by an ignition electrode, and combusted violently to form high-temperature and high-pressure gas, so that the gas is expanded to do work through turbine blades, and then drives the compressor to work through a connecting shaft, thereby realizing the operation of the aero-engine.

[0003] In this process, the combustion chamber, as a hot-end component, bears high-temperature and high-pressure gas, which brings great challenges to materials and processes, especially for the combustion chamber flame tube, which is the most important component for converting chemical energy in fuel into heat energy in the combustion chamber. The internal temperature of the flame tube can reach more than 1200 DEG C, so many problems need to be considered during the design and processing of the flame tube, especially the safety and reliability under harsh environments. Therefore, the cap cover, as a support structure of the flame tube, mainly bears the temperature load of the flame tube, guides the airflow, and controls the deformation and displacement of the flame tube. The safety, reliability and maintainability of its structure are great challenges.

[0004] The existing cap cover structure adopts a form in which a supporting plate self-locking nut assembly is directly welded on the cap cover part by argon arc welding, and then the flame tube is fixed to the combustion chamber outer casing and the diffuser through bolts. Since the cap cover and the supporting plate self-locking nut assembly are welded by argon arc welding, there is a risk of deformation under the influence of temperature, and the weld quality is uncontrollable as a special process. The maintainability is poor.

[0005] Based on this, the present application provides a flame tube, a combustion chamber and an aero-engine to solve the above technical problems. SUMMARY

[0006] The technical problem to be solved by the present application is to overcome the problems of deformation risk and uncontrollable weld quality of the cap cover and the supporting plate self-locking nut assembly in the prior art by welding, and to provide a flame tube, a combustion chamber and an aero-engine.

[0007] The present application solves the above technical problems by the following technical scheme:

[0008] The present application provides a flame tube, which is characterized by comprising:

[0009] The body is provided with a bolt through hole having a first end and a second end, the first end is towards the case or the diffuser, the second end is towards the inner cavity of the flame tube, the body is provided with a stop plate at the second end;

[0010] The stop nut is clamped in the bolt through hole at one end and abuts against the stop plate at the other end, so as to assemble the body and the outer case or the diffuser by connecting bolts.

[0011] According to one embodiment of the present application, the body comprises an outer cap and an inner cap, the outer cap and the inner cap are both provided with the bolt through hole, the outer cap is connected with the outer case by connecting bolts, and the inner cap is connected with the diffuser by connecting bolts.

[0012] According to one embodiment of the present application, the stop nut comprises a connecting end and a matching end arranged oppositely, and connecting bolts are sequentially arranged in the outer case or the diffuser, the connecting end and the matching end, so as to connect the body with the case or the diffuser;

[0013] The connecting end is used for inserting into the bolt through hole to connect with the body, and the matching end is self-locked.

[0014] According to one embodiment of the present application, the stop nut has a threaded cavity, the threaded cavity has a first cavity opening and a second cavity opening arranged oppositely, the first cavity opening end is used for inserting into the bolt through hole to connect with the body, and the circumferential dimension of the first cavity opening is greater than that of the second cavity opening.

[0015] One end of the bolt through hole towards the inside of the flame tube is self-locked, the first cavity opening end of the stop nut is used for inserting into the self-locked end of the threaded through hole, and the first cavity opening is expanded under the action of the expanding tool, so that the stop nut is clamped with the body.

[0016] According to one embodiment of the present application, the stop nut is provided with a stop portion at the outer circumferential side of the lower end of the first cavity opening, one end face of the stop portion abuts against the stop plate, so as to limit the stop nut.

[0017] According to one embodiment of the present application, the circumferential dimension of the stop portion is greater than the inner diameter of the bolt through hole.

[0018] According to one embodiment of the present application, the upper end face of the stop portion abuts against the outer end face of the self-locked end of the bolt through hole of the body.

[0019] According to one embodiment of the present application, the bolt through hole forms a limiting face at the self-locked end, and the limiting face is arranged around the inner cavity of the bolt through hole.

[0020] The outer peripheral surface of the first cavity end of the stop nut abuts against the limiting surface.

[0021] The present invention also provides a combustion chamber, characterized in that it comprises:

[0022] Outer casing and diffuser;

[0023] As described above, the flame tube is connected to the outer casing and the diffuser using connecting bolts.

[0024] The present invention also provides an aircraft engine, including the combustion chamber as described above.

[0025] The positive and progressive effects of this invention are as follows:

[0026] The flame tube of this invention fixes the stop nut on the bolt through hole of the main body, avoiding the weld quality problems caused by welding and the uncontrollable problems of special process processing. The structure is simple to process and easy to assemble.

[0027] Existing welded structures for pallet nuts require repair welding or machining to remove the nuts before re-welding during repairs. Welding easily leads to deformation, affecting component performance and reducing service life. This invention, however, allows direct removal of the locking nut during repairs without affecting the material properties or structural dimensions of the component itself. It enables multiple disassembly and reassembly, improving the maintainability of the overall components and significantly extending their service life.

[0028] The present invention has a stop plate on the main body, and the stop nut abuts against the stop plate. The tail of the stop nut is tapered to achieve a self-locking function, thereby satisfying the dual functions of anti-rotation and self-locking, which helps to ensure the connection stability between the connecting bolt and the stop nut. Attached Figure Description

[0029] The above and other features, properties and advantages of the present invention will become more apparent from the following description taken in conjunction with the accompanying drawings and embodiments, wherein:

[0030] Figure 1 This is a partial structural schematic diagram of the aero-engine of the present invention;

[0031] Figure 2 for Figure 1 The diagram shows a partial structural schematic of the flame tube.

[0032] Figure 3 This is a schematic diagram of the structure of the locking nut of the present invention before the use of the expansion tool;

[0033] Figure 4 for Figure 3 The top view of the stop nut shown;

[0034] Figure 5For Figure 2 Figure 2 is a schematic view of a structure of a flame tube without a stop nut installed;

[0035] Figure 6 For Figure 2 Figure 3 is a schematic view of a structure of a flame tube with a stop nut pre-installed.

[0036] 10, flame tube; 11, body; 12, bolt through hole; 121, limiting surface; 13, stop plate; 14, outer cap; 15, inner cap;

[0037] 20, stop nut; 210, connecting end; 220, matching end; 230, threaded cavity; 231, first cavity opening; 232, second cavity opening; 240, stop portion;

[0038] 30, fuel nozzle;

[0039] 40, outer casing;

[0040] 50, inner casing;

[0041] 60, diffuser. DETAILED DESCRIPTION

[0042] In order to make the above objectives, features and advantages of the present application more obvious and easy to understand, the specific embodiments of the present application will be described in detail below with reference to the accompanying drawings.

[0043] Embodiments of the present application will now be described in detail with reference to the accompanying drawings. Reference will now be made in detail to the preferred embodiments of the present application, examples of which are illustrated in the accompanying drawings. Wherever possible, the same reference numbers will be used throughout the drawings to refer to the same or like parts. Furthermore, although the terms used in the present application are selected from generally known and used terms, some of the terms mentioned in the description of the present application can be selected by the applicant in his or her judgment as appropriate, and the detailed meanings thereof are described in relevant parts of the description. Furthermore, it is required that the present application is not limited only by the actual terms used but also by the meanings of each term underlying the actual terms used based on the principle that the scope of the application is determined by the claims.

[0044] Referring to Figures 1 to 6 , the present application proposes a flame tube 10, which comprises a body 11 and a stop nut 20, the body 11 is provided with a bolt through hole 12, the bolt through hole 12 has a first end and a second end, the first end faces the casing or the diffuser 60, and the second end faces the inner cavity of the flame tube 10, and the body 11 is provided with a stop plate 13 at the second end; the stop nut 20 is clamped in the bolt through hole 12 at one end, and abuts against the stop plate 13 at the other end, so as to assemble the body 11 and the outer casing 40 or the diffuser 60 by using a connecting bolt.

[0045] Referring to Figure 2The body 11 represents a partial sectional view of the outer cap 14, and the stop nut 20 is clamped on the body 11, when the outer cap 14 needs to be connected with the outer casing 40, the connecting bolt is connected to the stop nut 20 on the body 11 through the outer casing 40, and then the connection between the body 11 and the outer casing 40 is completed. Thus, the problems of easy deformation and poor performance of parts caused by the traditional welding method are avoided.

[0046] Referring to Figure 1 and Figure 2 , Figure 1 Part of the internal structure of an aero-engine is shown. Specifically, the flame tube 10 is provided with an outer cap 14 and an inner cap 15, and bolt through holes 12 are formed in the outer cap 14 and the inner cap 15. The outer cap 14 is connected with the outer casing 40 by connecting bolts, and the inner cap 15 is connected with the diffuser 60 by connecting bolts.

[0047] The stop nut 20 is clamped on the bolt through hole 12 to connect the flame tube 10, the outer casing 40 and the diffuser 60, instead of using welding, so that the problems of easy deformation and poor performance of parts caused by welding are avoided.

[0048] When the stop nut 20 and the connecting bolt need to be repaired, the stop nut 20 can be directly removed and damaged, without affecting the material performance and structural size of the flame tube 10, so that the flame tube 10 can be repeatedly disassembled and reassembled, the maintainability of the whole assembly is improved, and the connection stability of the flame tube 10, the outer casing 40 and the diffuser 60 is improved.

[0049] Please refer to Figure 3 In one embodiment, the stop nut 20 includes a connecting end 210 and a matching end 220 arranged opposite to each other, and the connecting bolt is sequentially arranged in the outer casing 40 or the diffuser 60, the connecting end 210 and the matching end 220, so as to connect the body 11 with the casing or the diffuser 60.

[0050] The flame tube 10 has an inner cavity, and the stop nut 20 is installed on the inner end face of the body 11 facing the inner cavity. The connecting bolt is arranged in the stop nut 20 from the side of the outer casing 40 or the diffuser 60 to threadedly engage with the stop nut 20, so as to realize the connection between the flame tube 10 and the outer casing 40 or the diffuser 60.

[0051] The connecting end 210 is used for inserting into the bolt through hole 12 to connect with the body 11, and the matching end 220 is self-locked.

[0052] The self-locking structure of the matching end 220 can adopt a tapering manner or an eccentric structure at the end, which is not limited here.

[0053] In one embodiment, the stop nut 20 has a threaded cavity 230 with oppositely arranged first and second cavity openings 231 and 232, the first cavity opening 231 being arranged at an end for insertion into the bolt through hole 12 to connect with the body 11, and the first cavity opening 231 having a larger circumferential dimension than the second cavity opening 232. The bolt through hole 12 is arranged with a reduced end towards the inside of the flame tube 10, and the first cavity opening 231 of the stop nut 20 is arranged for insertion into the reduced end of the threaded through hole, and the first cavity opening 231 is expanded under the action of the expansion tool to enable the stop nut 20 to be clamped with the body 11.

[0054] Specifically, the initial state of the body 11 can be shown in the cross-sectional view shown in Figure 2 , Figure 5 and Figure 6 , Figure 5 Figure 6 shows the process of arranging the stop nut 20 on the body 11 when the body 11 needs to be connected with the outer casing 40 or the diffuser 60, at which time one end of the stop nut 20 can be inserted into the bolt through hole 12, and then the stop nut 20 is inserted into the end of the bolt through hole 12 for expansion under the action of the expansion tool, and the final completed state is shown in Figure 2 , Figure 2 shows the initial state of the body 11 during installation, and when the body 11 needs to be connected with the outer casing 40 or the diffuser 60, the connection can be completed by using the connecting bolt in cooperation with the stop nut 20 arranged on the body 11, and this connection process does not affect the material properties and structural dimensions of the flame tube 10, and can realize multiple disassembly and reassembly, thereby improving the maintainability of the overall components of the flame tube 10, and further improving the connection stability of the flame tube 10 with the outer casing 40 and the diffuser 60.

[0055] Specifically, in the initial state, the first cavity opening 231 of the stop nut 20 can be inserted into the reduced end of the threaded through hole, and then the first cavity opening 231 is expanded by using the expansion tool, so that the end of the stop nut 20 is clamped inside the threaded through hole. This clamping method does not affect the material properties and structural dimensions of the flame tube 10, and can realize multiple disassembly and reassembly, thereby improving the maintainability of the overall components of the flame tube 10.

[0056] In one embodiment, the stop nut 20 is arranged with a stop portion 240 at the outer circumferential side of the lower end of the first cavity opening 231, and one end surface of the stop portion 240 abuts against the stop plate 13 to limit the stop nut 20.

[0057] ​Specifically, the stop portion 240 is a stop surface formed by cutting the outer peripheral side of the stop nut 20, the number of the stop portion 240 is two, and the two stop portions 240 are arranged on opposite sides of the stop nut 20. The stop portion 240 is used for abutting against the end surface of the stop plate 13, so that when the connecting bolt is screwed into the stop nut 20, the stop nut 20 is in a relatively static state, thereby meeting the assembly of the connecting bolt and the stop nut 20.

[0058] Specifically, the circumferential dimension of the stop portion 240 is greater than the inner diameter of the bolt through hole 12.

[0059] That is, the stop plate 13 is arranged on the side of the bottom of the bolt through hole 12, and then the body 11 forms an L-shaped stop surface at the bottom of the bolt through hole 12. When the stop portion 240 abuts against the stop surface, the stop portion 240 is limited below the bolt through hole 12 under the action of the stop plate 13 and the bottom surface of the bolt through hole 12, so that when the connecting bolt is connected with the stop nut 20, the stop nut 20 is in a static fitting state under the action of the stop plate 13. When the connecting bolt reaches the end of the stop nut 20, the stop nut 20 is self-locked, and the positioning connection with the connecting bolt is completed.

[0060] In one embodiment, the upper end surface of the stop portion 240 abuts against the outer end surface of the body 11 at the closed end of the bolt through hole 12.

[0061] In order to improve the connection stability between the stop nut 20 and the body 11, the upper end surface of the stop portion 240 abuts against the outer end surface of the body 11 at the closed end of the bolt through hole 12, so that the body 11 limits the stop portion 240, which is beneficial to the assembly and connection of the connecting bolt and the body 11.

[0062] Further, the bolt through hole 12 forms a limiting surface 121 at the closed end, the limiting surface 121 is arranged around the inner cavity of the bolt through hole 12, and the outer peripheral surface of the first cavity opening 231 of the stop nut 20 abuts against the limiting surface 121.

[0063] Specifically, the limiting surface 121 is a bevel surface, and the closed end is formed in a bevel shape. When the connecting bolt and the stop nut 20 need to be repaired, the stop nut 20 is more easily removed, and the safety of the removal process is higher.

[0064] In summary, the flame tube 10 of the present application fixes the stop nut 20 on the bolt through hole 12 of the body 11, avoids the problems of weld quality and uncontrollable special process caused by welding, and has simple structure and convenient assembly.

[0065] For the existing support plate nut welding structure form, when repairing, it is necessary to remove the support plate nut by welding or machining and then re-welding, which is easy to deform and affect the performance of the part, and reduce the service life. The application can directly remove the stop nut 20 during repair, without affecting the material performance and structure size of the body 11, and can realize multiple disassembly and reassembly, thereby improving the maintainability of the overall component and greatly improving the service life.

[0066] The application sets a stop plate 13 on the body 11, the stop nut 20 abuts against the stop plate 13, and the tail of the stop nut 20 is closed to realize self-locking function, thereby meeting the functions of anti-rotation and self-locking, and being beneficial to ensuring the connection stability of the connecting bolt and the stop nut 20.

[0067] The application also provides a combustion chamber, which comprises an outer casing 40, an inner casing 50, a diffuser 60, a fuel nozzle 30 and the flame tube 10.

[0068] Specifically, the stop nut 20 is arranged on the flame tube 10, and the connecting bolt is sequentially arranged in the outer casing 40 or the diffuser 60 and then extends to the side of the flame tube 10 and is connected with the stop nut 20, avoiding the welding of the nut on the flame tube 10 in the prior art, which is easy to deform under high temperature and affects the connection stability of the flame tube 10, the outer casing 40 and the diffuser 60. The stop nut 20 of the application is clamped on the flame tube 10 and is not welded, and the installation of the stop nut 20 will not affect the material performance and structure of the flame tube 10, and the flame tube 10 can be disassembled and reassembled, thereby improving the maintainability of the flame tube 10, the outer casing 40 and the diffuser 60, and further improving the service life of the combustion chamber.

[0069] Moreover, the stop nut 20 is externally provided with a stop portion 240, which abuts against the stop plate 13 arranged on the body 11, thereby realizing the function of anti-rotation, and the end of the stop nut 20 can realize self-locking, thereby being beneficial to limiting the connection of the connecting bolt.

[0070] The application also provides an aero-engine comprising the above-mentioned combustion chamber, thereby having the beneficial effects of the combustion chamber, which will not be repeated here.

[0071] The application uses specific words to describe the embodiments of the application. As "one embodiment", "an embodiment" and / or "some embodiments" means a certain feature, structure or characteristic related to at least one embodiment of the application. Therefore, it should be emphasized and noted that the "one embodiment" or "one embodiment" or "one alternative embodiment" mentioned in different positions in the specification does not necessarily mean the same embodiment. In addition, some features, structures or characteristics in one or more embodiments of the application can be properly combined.

[0072] Although the present application is disclosed with reference to the preferred embodiments, it is to be understood that the application is not limited to the preferred embodiments. Any modifications and changes, which come within the spirit and scope of the present application, are intended to be part of this disclosure. Accordingly, any modifications, equivalent changes, and substitutions, which do not depart from the technical concept of the present application, are to be included in the scope of the present application.

Claims

1. A flame tube, characterized in that, include: The main body has a bolt through hole, which has a first end and a second end. The first end faces the casing or diffuser, and the second end faces the inner cavity of the flame tube. The main body has a stop plate at the second end. A stop nut, one end of which is inserted into the bolt through hole and the other end abuts against the stop plate, is used to assemble the body and the outer casing or diffuser using connecting bolts; The stop nut includes a connecting end and a mating end arranged opposite each other. The connecting bolts are sequentially passed through the outer casing or diffuser, the connecting end and the mating end to connect the body to the casing or diffuser. The connecting end is used to be inserted into the bolt through hole and connected to the body, and the mating end is self-locking at the end; The stop nut has a threaded cavity, which has a first cavity and a second cavity disposed opposite to each other. The first cavity is used to be inserted into the bolt through hole to connect with the body. The circumferential dimension of the first cavity is larger than that of the second cavity. The bolt through hole is tapered at one end facing the inside of the flame tube. The first cavity end of the stop nut is used to be inserted into the tapered end of the threaded through hole, and the first cavity is opened by the expansion tool so that the stop nut is engaged with the body. The stop nut has a stop portion on the outer periphery of the lower end of the first cavity, and one end face of the stop portion abuts against the stop plate to limit the stop nut.

2. The flame tube according to claim 1, characterized in that, The main body includes an outer cap and an inner cap, both of which have bolt through holes. The outer cap is connected to the outer casing by connecting bolts, and the inner cap is connected to the diffuser by connecting bolts.

3. The flame tube according to claim 1, characterized in that, The circumferential dimension of the stop is greater than the inner diameter of the bolt through hole.

4. The flame tube according to claim 1, characterized in that, The upper end face of the stop part abuts against the outer end face of the body at the constricted end of the bolt through hole.

5. The flame tube according to claim 1, characterized in that, The bolt through hole forms a limiting surface at the constricted end, and the limiting surface is arranged around the inner cavity of the bolt through hole; The outer peripheral surface of the first cavity end of the stop nut abuts against the limiting surface.

6. A combustion chamber, characterized in that, include: Outer casing and diffuser; The flame tube as described in any one of claims 1-5, wherein the flame tube is connected to the outer casing and the diffuser by connecting bolts.

7. An aircraft engine, characterized in that, Includes the combustion chamber as described in claim 6.

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