Flame tube, combustion chamber and aero-engine

Abstract

The invention 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 is provided with a first end and a second end, the first end faces a cartridge receiver or a diffuser, the second end faces an inner cavity of the flame tube, and 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 of the stop nut abuts against the stop plate so that the body and the outer casing or the diffuser can be assembled through the connecting bolt. According to the flame tube, the stop nut is fixed to the bolt through hole of the body, the welding seam quality problem caused by welding and the problem that special technology machining is uncontrollable are solved, and the flame tube is simple in structure machining and convenient to assemble.

Description

Technical Field

[0001] The present invention relates to the technical field of aeroengines, and in particular to a flame tube, a combustion chamber and an aeroengine. Background Art

[0002] At present, most of the combustion chambers in civil aviation engines, especially those with large bypass ratio, adopt a front cap positioning structure. Based on the working principle of the aircraft engine, the high-pressure gas compressed by the high-pressure compressor is fully mixed with the aviation kerosene flowing into the combustion chamber from the fuel adapter, and then ignited by the ignition nozzle, which burns violently and forms high-temperature and high-pressure combustion gas, which then expands and does work through the turbine blades, and then drives the compressor to work through the connecting shaft, thereby realizing the operation of the entire aircraft 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 in the combustion chamber to convert chemical energy in the fuel into thermal energy. The internal temperature of the flame tube can reach over 1200°C, so many issues need to be considered when designing and processing the flame tube, especially the safety and reliability of working in harsh environments. Therefore, as the supporting structure of the flame tube, the cap mainly bears the temperature load brought by the flame tube, while guiding the airflow and controlling the deformation and displacement of the flame tube. The safety, reliability and maintainability of its structure are huge challenges.

[0004] In the existing cap cover structure, the overall structure is fixed to the cap cover part directly by argon arc welding using a support plate self-locking nut assembly, and then the flame tube is fixed to the combustion chamber outer casing and diffuser by bolts. Since the cap cover and the support plate self-locking nut assembly are welded by argon arc welding, there is a risk of deformation due to temperature. At the same time, welding is a special process, and the weld quality is uncontrollable; the maintainability is poor.

[0005] Based on this, the inventor of the present application proposes a flame tube, a combustion chamber and an aircraft engine in order to solve the above-mentioned technical problems. Summary of the invention

[0006] The technical problem to be solved by the present invention is to overcome the deformation risk of the cap and support plate self-locking nut assembly through argon arc welding in the prior art and the problem that the weld quality is uncontrollable, and to provide a flame tube, a combustion chamber and an aircraft engine.

[0007] The present invention solves the above technical problems through the following technical solutions:

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

[0009] A body, on which a bolt through hole is formed, wherein the bolt through hole has a first end and a second end, wherein the first end faces the casing or the diffuser, and the second end faces the inner cavity of the flame tube, and the body is provided with a stop plate at the second end;

[0010] A stop nut has one end clamped in the bolt through hole and the other end abutted against the stop plate, so as to be used for assembling the body and the outer casing or the diffuser by means of connecting bolts.

[0011] According to one embodiment of the present invention, the body includes an outer cap cover and an inner cap cover, both of which are provided with the bolt through holes, the outer cap cover is connected to the outer casing by connecting bolts, and the inner cap cover is connected to the diffuser by connecting bolts.

[0012] According to one embodiment of the present invention, the retaining nut includes a connecting end and a mating end that are arranged opposite to each other, and a connecting bolt is sequentially passed through the outer casing or the diffuser, the connecting end to the mating end, so as to connect the body with the casing or the diffuser;

[0013] The connecting end is used to be inserted into the bolt through hole to be connected with the main body, and the matching end is closed and self-locking.

[0014] According to one embodiment of the present invention, the stop nut has a threaded cavity, the threaded cavity has a first cavity opening and a second cavity opening that are arranged opposite to each other, the first cavity opening end is used to be inserted into the bolt through hole to be connected to the body, and the circumferential size of the first cavity opening is larger than that of the second cavity opening;

[0015] The bolt through hole is closed at one end facing the inner side of the flame tube, and the first cavity end of the stop nut is used to be inserted into the closed end of the threaded through hole, and the first cavity is expanded under the action of an expansion tool to enable the stop nut to be clamped with the body.

[0016] According to an embodiment of the present invention, the stop nut is provided with a stop portion on the outer peripheral side of the lower end of the first cavity, and one end surface of the stop portion abuts against the stop plate to limit the stop nut.

[0017] According to an embodiment of the present invention, the circumferential dimension of the stopper portion is larger than the inner diameter of the bolt through hole.

[0018] According to an embodiment of the present invention, the upper end surface of the stop portion abuts against the outer end surface of the body at the closing end of the bolt through hole.

[0019] According to an embodiment of the present invention, the bolt through hole forms a limited surface at the closing end, and the limited surface 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, which is characterized in that it includes:

[0022] outer case and diffuser;

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

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

[0025] The positive and progressive effects of the present invention are:

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

[0027] In view of the existing support plate nut welding structure, when repairing, the support plate nut needs to be removed by repair welding or machining and then re-welded. Since welding is easy to deform, it affects the performance of the parts and reduces the service life. However, the present invention can directly remove the stop nut during repair, without affecting the material performance and structural dimensions of the body itself, and can achieve multiple disassembly and reassembly, thereby improving the maintainability of the overall components and greatly improving their service life.

[0028] The present invention arranges a stop plate on the main body, the stop nut abuts against the stop plate, and the tail end of the stop nut can realize a self-locking function, thereby satisfying the dual functions of anti-rotation and self-locking, which is beneficial to ensure the connection stability of the connecting bolt and the stop nut. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0030] Figure 1 It is a partial structural schematic diagram of the aircraft engine of the present invention;

[0031] Figure 2 for Figure 1 A partial structural schematic diagram of the flame tube shown;

[0032] Figure 3 It is a schematic diagram of the structure of the stop nut of the present invention before the expansion tool is used;

[0033] Figure 4 for Figure 3 A top view of the retaining nut is shown;

[0034] Figure 5for Figure 2 The schematic diagram of the structure of the flame tube shown is not equipped with a stop nut;

[0035] Figure 6 for Figure 2 Schematic diagram of the structure of the flame tube and the 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, connection end; 220, mating end; 230, threaded cavity; 231, first cavity opening; 232, second cavity opening; 240, stopper;

[0038] 30. Fuel nozzle;

[0039] 40. Outer receiver;

[0040] 50. Inner receiver;

[0041] 60. Diffuser. DETAILED DESCRIPTION

[0042] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0043] Embodiments of the present invention will now be described in detail with reference to the accompanying drawings. Reference will now be made in detail to preferred embodiments of the present invention, examples of which are shown in the accompanying drawings. Wherever possible, the same reference numerals will be used in all drawings to represent the same or similar parts. In addition, although the terms used in the present invention are selected from well-known and commonly used terms, some of the terms mentioned in the specification of the present invention may be selected by the applicant at his or her discretion, and their detailed meanings are explained in the relevant parts of the description herein. In addition, it is required to understand the present invention not only by the actual terms used, but also by the meaning implied by each term.

[0044] Please refer to Figures 1 to 6 The present invention proposes a flame tube 10, which includes a body 11 and a stop nut 20. A bolt through hole 12 is opened on the body 11, and 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. The body 11 is provided with a stop plate 13 at the second end; one end of the stop nut 20 is clamped in the bolt through hole 12, and the other end abuts against the stop plate 13, so as to assemble the body 11 and the outer casing 40 or the diffuser 60 by using connecting bolts.

[0045] Reference Figure 2The body 11 in the figure represents a partial cross-sectional view of the outer cap 14. At this time, a stop nut 20 is clamped on the body 11. When the outer cap 14 needs to be connected to the outer casing 40, a connecting bolt is used to connect to the stop nut 20 position at the body 11 through the outer casing 40 side, thereby completing the connection between the body 11 and the outer casing 40. This avoids the problems of easy deformation and poor performance of parts caused by traditional welding methods.

[0046] Reference Figure 1 and Figure 2 , Figure 1 Part of the internal structure of the aircraft engine is shown. Specifically, an outer cap cover 14 and an inner cap cover 15 are provided at the end of the flame tube 10, and bolt through holes 12 are opened on the outer cap cover 14 and the inner cap cover 15. The outer cap cover 14 is connected to the outer casing 40 by connecting bolts, and the inner cap cover 15 is connected to the diffuser 60 by connecting bolts.

[0047] The present invention uses a stop nut 20 to be clamped in the bolt through hole 12 to connect the flame tube 10, the outer casing 40 and the diffuser 60, instead of welding, which can avoid the problem of easy deformation of welding and affecting the performance of parts.

[0048] In the present invention, when the structures such as the stop nut 20 and the connecting bolts need to be repaired, the stop nut 20 can be directly removed and destroyed without affecting the material properties and structural dimensions of the flame tube 10 itself. It can be disassembled and reassembled multiple times, thereby improving the maintainability of the overall components and further improving the connection stability between the flame tube 10 and the outer casing 40 and the diffuser 60.

[0049] Please refer to Figure 3 In one embodiment, the stop nut 20 includes a connecting end 210 and a mating end 220 that are relatively arranged, and the connecting bolt is sequentially passed through the outer casing 40 or the diffuser 60, the connecting end 210 to the mating end 220 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 surface of the main body 11 facing the inner cavity. The connecting bolt is passed through the outer casing 40 or the diffuser 60 side to the inner side of the stop nut 20 to be threadedly matched with the stop nut 20, thereby realizing the connection between the flame tube 10 and the outer casing 40 or the diffuser 60.

[0051] The connecting end 210 is used to be inserted into the bolt through hole 12 to be connected to the body 11 , and the matching end 220 is closed and self-locking.

[0052] The self-locking structure of the mating end 220 may be in the form of a closed end or in the form of an eccentrically disposed end portion, which is not limited here.

[0053] In one embodiment, the stop nut 20 has a threaded cavity 230, and the threaded cavity 230 has a first cavity opening 231 and a second cavity opening 232 that are arranged opposite to each other. The first cavity opening 231 is used to be inserted into the bolt through hole 12 to be connected to the body 11, and the circumferential size of the first cavity opening 231 is larger than the second cavity opening 232. The bolt through hole 12 is closed at one end facing the inner side of the flame tube 10, and the first cavity opening 231 of the stop nut 20 is used to be inserted into the closed end of the threaded through hole, and the first cavity opening 231 is expanded under the action of the expansion tool so that the stop nut 20 is clamped with the body 11.

[0054] For details, please refer to Figure 2 , Figure 5 and Figure 6 , Figure 5 , a cross-sectional view of the body 11 in its initial state is shown in FIG. Figure 6 The figure shows the process of setting the stop nut 20 on the body 11 when the body 11 needs to be connected to the outer casing 40 or the diffuser 60. At this 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 under the action of the expansion tool to expand the opening. The final completion state is Figure 2 , Figure 2 The figure shows the initial installation state of the main body 11. When the main body 11 needs to be connected to the outer casing 40 or the diffuser 60, the connection can be completed by using the connecting bolts in conjunction with the stop nuts 20 provided on the main body 11. The connection process will not affect the material properties and structural dimensions of the flame tube 10 itself, and can be disassembled and reassembled multiple times, thereby improving the maintainability of the overall components and further improving the connection stability between the flame tube 10 and the outer casing 40 and the diffuser 60.

[0055] Specifically, in the initial state, the first cavity 231 end of the stop nut 20 can be inserted into the closing end of the threaded through hole, and then the first cavity 231 is expanded outward using an expansion tool, so that the end of the stop nut 20 is clamped inside the threaded through hole. This clamping method will not affect the material properties and structural dimensions of the flame tube 10 itself, and can be disassembled and reassembled multiple times, thereby improving the maintainability of the overall components of the flame tube 10.

[0056] In one embodiment, the stop nut 20 is provided with a stop portion 240 on the outer peripheral side of the lower end of the first cavity 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 out part of the structure on the outer peripheral side of the stop nut 20. There are two stop portions 240, which are arranged on opposite sides of the stop nut 20. The stop portion 240 is used for the end face to abut against the stop plate 13. Therefore, when the connecting bolt and the stop nut 20 are screwed in, the stop nut 20 is in a relatively static state to meet the assembly requirements of the connecting bolt and the stop nut 20.

[0058] Specifically, the circumferential dimension of the stopper 240 is larger 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 main 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, under the action of the stop plate 13 and the bottom surface of the bolt through hole 12, the stop portion 240 is limited to below the bolt through hole 12. Therefore, when the connecting bolt is connected with the stop nut 20, the stop nut 20 is in a static mating 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-locking to complete the positioning connection with the connecting bolt.

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

[0061] In order to improve the connection stability between the stop nut 20 and the main body 11, the upper end face of the stop portion 240 is abutted against the outer end face of the main body 11 at the closing end of the bolt through hole 12, so that the main body 11 forms a limit for the stop portion 240, which is conducive to the assembly connection between the connecting bolt and the main body 11.

[0062] Furthermore, a limiting surface 121 is formed at the closing end of the bolt through hole 12 , and 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 231 end of the stop nut 20 abuts against the limiting surface 121 .

[0063] Specifically, the limiting surface 121 is an inclined surface, and adopts an inclined surface closing method. When the connecting bolt and the stop nut 20 need to be repaired, it is more convenient to remove the stop nut 20, and the removal process is safer.

[0064] In summary, the flame tube 10 of the present invention fixes the stop nut 20 on the bolt through hole 12 of the body 11, 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.

[0065] In view of the existing support plate nut welding structure, when repairing, the support plate nut needs to be removed by repair welding or machining and then re-welded. Since welding is easy to deform, it affects the performance of the parts and reduces the service life. However, the present invention can directly remove the stop nut 20 during repair, without affecting the material properties and structural dimensions of the body 11 itself, and can achieve multiple disassembly and reassembly, thereby improving the maintainability of the overall components and greatly improving their service life.

[0066] The present invention sets a stop plate 13 on the main body 11, and the stop nut 20 abuts against the stop plate 13, and the tail end of the stop nut 20 can realize the self-locking function, thereby satisfying the dual functions of anti-rotation and self-locking, which is beneficial to ensure the connection stability between the connecting bolt and the stop nut 20.

[0067] The present invention also provides a combustion chamber, comprising an outer casing 40, an inner casing 50, a diffuser 60, a fuel nozzle 30 and the above-mentioned flame tube 10, wherein the flame tube 10 is connected to the outer casing 40 and the diffuser 60 by connecting bolts.

[0068] Specifically, a stop nut 20 is provided on the flame tube 10, and the connecting bolts are sequentially passed through the outer casing 40 or the diffuser 60 and then extended to the side of the flame tube 10 and connected with the stop nut 20, thereby avoiding the prior art method of welding the nut to the flame tube 10, which is easily deformed by high temperature and affects the connection stability between the flame tube 10 and the outer casing 40 and the diffuser 60. However, the stop nut 20 of the present invention is clamped on the flame tube 10 instead of being welded. The installation of the stop nut 20 will not affect the material properties and structure of the flame tube 10 itself, and it can be disassembled and reassembled, thereby improving the maintainability of the flame tube 10, the outer casing 40 and the diffuser 60, and thus improving the service life of the combustion chamber.

[0069] Moreover, the stop nut 20 is provided with a stop portion 240 outside, which abuts against the stop plate 13 provided on the main body 11, thereby realizing the anti-rotation function. At the same time, the end of the stop nut 20 can achieve self-locking, which is convenient for limiting the connection of the connecting bolt.

[0070] The present invention also provides an aircraft engine, including the above-mentioned combustion chamber, thereby having the beneficial effects of the combustion chamber, which will not be described in detail here.

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

[0072] Although the present invention is disclosed as above with preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art may make possible changes and modifications without departing from the spirit and scope of the present invention. Therefore, any modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention shall fall within the protection scope defined by the claims of the present invention.

Claims

1. A flame tube, characterized in that: include: 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 the casing or the diffuser, the second end faces the inner cavity of the flame tube, and the body is provided with a stop plate at the second end; A stop nut has one end clamped in the bolt through hole and the other end abutted against the stop plate, so as to be used for assembling the body and the outer casing or the diffuser by means of connecting bolts.

2. The flame tube according to claim 1, characterized in that: The body comprises an outer cap cover and an inner cap cover, both of which are provided with the bolt through holes, the outer cap cover is connected to the outer casing by connecting bolts, and the inner cap cover is connected to the diffuser by connecting bolts.

3. The flame tube according to claim 1, characterized in that: The stop nut includes a connecting end and a matching end that are arranged opposite to each other, and a connecting bolt is sequentially passed through the outer casing or the diffuser, the connecting end to the matching end, so as to connect the body with the casing or the diffuser; The connecting end is used to be inserted into the bolt through hole to be connected with the main body, and the matching end is closed and self-locking.

4. The flame tube according to claim 3, characterized in that: The stop nut has a threaded cavity, the threaded cavity has a first cavity opening and a second cavity opening which are arranged opposite to each other, the first cavity opening end is used to be inserted into the bolt through hole to be connected with the body, and the circumferential size of the first cavity opening is larger than that of the second cavity opening; The bolt through hole is closed at one end facing the inner side of the flame tube, and the first cavity end of the stop nut is used to be inserted into the closed end of the threaded through hole, and the first cavity is expanded under the action of an expansion tool to enable the stop nut to be clamped with the body.

5. The flame tube according to claim 4, characterized in that: The stop nut is provided with a stop portion on the outer peripheral side of the lower end of the first cavity, and one end surface of the stop portion abuts against the stop plate to limit the stop nut.

6. The flame tube according to claim 5, characterized in that: The circumferential dimension of the stopper portion is larger than the inner diameter of the bolt through hole.

7. The flame tube according to claim 5, characterized in that: The upper end surface of the stopper portion abuts against the outer end surface of the body at the closing end of the bolt through hole.

8. The flame tube according to claim 5, characterized in that: The bolt through hole forms a limited surface at the closing end, and the limited 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.

9. A combustion chamber, characterized in that: include: outer case and diffuser; The flame tube as described in any one of claims 1 to 8, wherein the flame tube is connected to the outer casing and the diffuser by connecting bolts.

10. An aircraft engine, characterized in that: Comprising a combustion chamber as claimed in claim 9.

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