Combustion chamber, method for assembling a combustion chamber group and aeroengine

Abstract

The application provides a combustion chamber, a combustion chamber assembly welding method and an aero-engine. The combustion chamber comprises an outer casing and a diffuser. The inner side of the outer casing is provided with a first connecting head. The outer side of the diffuser is provided with a second connecting head corresponding to the first connecting head. The outer casing and the diffuser are welded at the first connecting head and the second connecting head, and the welding seam is parallel to the axial direction of the outer casing and the diffuser. The welding seam between the first connecting head of the outer casing and the second connecting head of the diffuser is parallel to the axial direction of the outer casing and the diffuser. Therefore, when the outer casing and the diffuser need to be welded, the outer casing and the diffuser can be horizontally turned by 90 degrees. Thus, the electron beam can be used to weld the outer casing and the diffuser from top to bottom, and the welding is convenient.

Description

TECHNICAL FIELD

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

[0002] A modern high-bypass-ratio turbofan aero-engine is a gas turbine, which is usually composed of an inlet duct, a fan pressurization stage, a high-pressure compressor, a combustion chamber, a high-pressure turbine, a low-pressure turbine and a tail nozzle in series. The combustion chamber is one of the core components of the gas turbine, which is used to mix high-temperature and high-pressure gas and fuel and make them burn to achieve the purpose of warming and pressurizing.

[0003] The airflow transmitted from the compressor to the combustion chamber has a high speed, which can reach 120m / s-220m / s, and it is difficult for the fuel to burn stably in such a high-speed airflow. In order to slow down and pressurize the gas transmitted from the compressor to the combustion chamber, so that it is more conducive to combustion, an expander is generally arranged in the combustion chamber. The expander is generally connected with the combustion chamber outer casing together by bolt connection or welding, etc., which can convert most of the kinetic energy of the high-speed airflow into static pressure and form a relatively stable flow field.

[0004] At present, one of the common ways for the combustion chamber outer casing and the expander is welding, and the design of the welding joint will directly affect the connection strength of the outer casing and the expander, as well as the processing cost and difficulty. Unreasonable welding joint will lead to reduced service life of the connection between the outer casing and the expander, or great processing difficulty and difficult to guarantee the quality of the welding seam.

[0005] Based on this, the present application provides a combustion chamber, a combustion chamber assembly welding method 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 defects of difficult to guarantee the welding quality of the outer casing and the expander, great welding difficulty and high cost in the prior art, and to provide a combustion chamber, a combustion chamber assembly welding method and an aero-engine.

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

[0008] The present application provides a combustion chamber, which is characterized by comprising:

[0009] The outer casing has a first connecting head on the inner side;

[0010] The expander is provided with a second connecting head corresponding to the first connecting head on the outer side; wherein

[0011] The outer casing and the expander are welded at the first connecting head and the second connecting head, and the welding seam is parallel to the axial direction of the outer casing and the expander.

[0012] According to one embodiment of the present application, the outer casing is provided with a first thickened layer on the outer periphery, and the diffuser is provided with a second thickened layer on the outer periphery.

[0013] The second thickened layer has a thickness greater than that of the first thickened layer, and a concave collection area is formed between the end of the second thickened layer towards the first thickened layer and the first thickened layer.

[0014] According to one embodiment of the present application, the second thickened layer forms a melt platform at the end thereof towards the first thickened layer, and the first thickened layer is concavely arranged at the end thereof towards the second thickened layer, and the melt platform and the concave portion of the first thickened layer form the collection area.

[0015] According to one embodiment of the present application, a connecting weld is formed at the first connecting head and the second connecting head, and the connecting weld has an electron beam welding inlet end and an electron beam welding outlet end.

[0016] The collection area is located at the electron beam welding inlet end, and the second connecting head is provided with a positioning platform at the electron beam welding outlet end to extend the extension length of the connecting weld.

[0017] According to one embodiment of the present application, the positioning platform has a first positioning surface on the side thereof towards the outer casing, and the outer casing has a second positioning surface on the side thereof towards the positioning platform, and in the assembled state of the outer casing and the diffuser, the first positioning surface and the second positioning surface abut each other to enable the positioning platform to provide positioning support to the outer casing.

[0018] According to one embodiment of the present application, the electron beam welding inlet end is located in the collection area.

[0019] According to one embodiment of the present application, the first thickened layer is integrally arranged with the diffuser.

[0020] The second thickened layer is integrally arranged with the outer casing.

[0021] The present application also provides an aero-engine, which is characterized by comprising the combustion chamber as described above.

[0022] The present application also provides a combustion chamber assembling method for the combustion chamber as described above, which is characterized by comprising the following steps.

[0023] Aligning the first connecting head of the outer casing with the second connecting head of the diffuser;

[0024] Assembling the outer casing and the diffuser from a mounted state to an assembled state, wherein in the assembled state, the first connecting head and the second connecting head are vertically arranged at the aligned position.

[0025] The first connecting head and the second connecting head are welded in the vertical direction by electron beam welding.

[0026] According to one embodiment of the present application, after the outer casing and the diffuser are welded, the thickened layer on the outer periphery of the outer casing and the diffuser is removed.

[0027] The positive progress effect of the present application is that:

[0028] The welding seam between the first connecting head of the outer casing and the second connecting head of the diffuser is parallel to the axis of the outer casing and the diffuser, so when the outer casing and the diffuser need to be welded, the outer casing and the diffuser can be horizontally turned by 90 degrees, so that the electron beam can be used to weld the outer casing and the diffuser from top to bottom, which is convenient for welding.

[0029] The thickened layer is arranged on the outer periphery of the diffuser and the outer casing, so as to ensure the strength of the welding position.

[0030] The second connecting head of the diffuser is provided with a positioning table, which can be used for axial positioning when welding with the outer casing, improving the assembly precision of the outer casing and the diffuser, and preventing the molten slag from splashing during welding.

[0031] After the diffuser and the outer casing are welded, the thickened layer arranged on the outer periphery of the diffuser and the outer casing is removed by turning processing, so as to reduce the weight of the connection position of the diffuser and the outer casing. BRIEF DESCRIPTION OF DRAWINGS

[0032] The above and other features, properties, and advantages of the present application will become more apparent through the following description with reference to the accompanying drawings and embodiments, in which:

[0033] Figure 1 It is a schematic view of part of the combustion chamber of the present application;

[0034] Figure 2 It is a schematic view of the first connecting head and the second connecting head in the installed state of the present application;

[0035] Figure 3 It is a schematic view of the first connecting head and the second connecting head in the assembled state of the present application;

[0036] Figure 4 It is a flow chart of the combustion chamber assembly method of the present application.

[0037] 10, outer casing; 110, first connecting head; 120, first thickened layer; 130, connecting welding seam; 140, second positioning surface;

[0038] 20, diffuser; 210, second connecting head; 220, second thickened layer; 230, collection area; 240, melting table; 250, positioning table; 251, first positioning surface. DETAILED DESCRIPTION

[0039] In order to make the above objectives, characteristics and advantages of the present application more apparent, the specific embodiments of the present application will be described in detail below with reference to the accompanying drawings.

[0040] Reference will now be made in detail to the 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. In addition, 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, and the detailed meanings thereof are described in relevant parts of the description herein. Furthermore, the present application should not be construed as being limited only to the actual terms used but should be understood to include not only the meaning of the actual terms but also the meanings of the terms in conjunction with the description.

[0041] Reference will now be made in detail to the 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. In addition, 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, and the detailed meanings thereof are described in relevant parts of the description herein. Furthermore, the present application should not be construed as being limited only to the actual terms used but should be understood to include not only the meaning of the actual terms but also the meanings of the terms in conjunction with the description. Figures 1 to 3 The present application proposes a combustion chamber, which comprises an outer casing 10 and a diffuser 20. The inner side of the outer casing 10 is provided with a first connecting head 110. The outer side of the diffuser 20 is provided with a second connecting head 210 corresponding to the first connecting head.

[0042] The diffuser 20 is located on the inner side of the outer casing 10. The first connecting head 110 provided on the outer casing 10 extends toward the diffuser 20. The second connecting head 210 provided on the diffuser 20 extends toward the outer casing 10.

[0043] The outer casing 10 and the diffuser 20 are welded at the first connecting head 110 and the second connecting head 210. The welding seam is parallel to the axial direction of the outer casing 10 and the diffuser 20.

[0044] In the present application, the outer casing 10 and the diffuser 20 are connected by electron beam welding.

[0045] In the initial state, the outer casing 10 and the diffuser 20 are both mounted on a positioning tool. The electron beam welding device is generally located above the tool. The emission path of the electron beam is also in the vertical direction. Therefore, the outer casing 10 and the diffuser 20 need to be rotated from the initial mounting state to the assembly welding state.

[0046] Generally, the initial mounting state is that the outer casing 10 is located above the diffuser 20. At this time, the welding seam is parallel to the axial direction of the diffuser 20 and the outer casing 10. In order to facilitate welding, the outer casing 10 and the diffuser 20 need to be rotated by 90 degrees to the assembly welding state. At this time, the welding seam is in the vertical state, which matches the electron beam welding device. Thus, the welding of the outer casing 10 and the diffuser 20 can be completed.

[0047] In order to reduce the length of the welding seam, the conventional welding mode is to use the inclined welding mode, that is, the welding seam is perpendicular to the length extension direction of the first connecting head 110 and the second connecting head 210, and at this time, the extension path of the welding seam in the first connecting head 110 and the second connecting head 210 is the shortest.

[0048] However, in the initial state of this mode, the included angle between the welding seam and the axial direction of the outer casing 10 and the diffuser 20 needs to be determined first, and then when the assembly welding is needed, the extension path of the welding seam is adjusted to be consistent with the emission path of the electron beam.

[0049] However, it is difficult to make the extension path of the welding seam completely consistent with the emission path of the electron beam in the adjustment process, which causes the included angle between the emission path of the electron beam and the welding seam, and causes the connection between the outer casing 10 and the diffuser 20 to form a false weld, resulting in poor welding quality.

[0050] Moreover, due to the machining precision of the connection between the outer casing 10 and the diffuser 20, it is difficult to calculate the included angle between the extension direction of the welding seam and the axial direction of the outer casing 10 and the diffuser 20, and the machining precision and the angle calculation will affect the welding quality of the welding seam.

[0051] Because the connection between the outer casing 10 and the diffuser 20 mainly relies on welding for support, if the welding quality between the outer casing 10 and the diffuser 20 is poor, it directly leads to low connection strength between the outer casing 10 and the diffuser 20.

[0052] In the present application, the welding seam between the first connecting head 110 and the second connecting head 210 is parallel to the axial direction of the outer casing 10 and the diffuser 20, and when welding is needed, the respective tooling is directly rotated by 90 degrees, which is more convenient for controlling the rotation angle, and thus it is easier to match the extension direction of the welding seam with the emission path of the electron beam and the precision is easier to control, which is beneficial to improve the welding quality between the outer casing 10 and the diffuser 20, and further improve the connection strength between the outer casing 10 and the diffuser 20.

[0053] The vertical welding can not consider the machining precision of the end of the first connecting head 110 and the second connecting head 210, and the welding quality is not affected, and the machining precision is eliminated after the welding is completed. However, in the conventional machining mode, the machining precision becomes a factor affecting the angle calculation, which makes it difficult for the outer casing 10 and the diffuser 20 to rotate to the target angle and the target assembly welding position.

[0054] In one embodiment, the outer casing 10 is provided with a first thickened layer 120 on the outer periphery, and the diffuser 20 is provided with a second thickened layer 220 on the outer periphery; the thickness of the second thickened layer 220 is greater than that of the first thickened layer 120, and the second thickened layer 220 forms a concave collection area 230 between the end portion thereof facing the first thickened layer 120 and the first thickened layer 120.

[0055] In the welding process, the connecting portions of the first connecting head 110 and the second connecting head 210 are prone to collapse, so the collection area 230 is provided on the outer periphery of the outer casing 10 and the diffuser 20, and the first thickened layer 120 and the second thickened layer 220 can be used for self-filling during welding, and the collection area 230 is used for guiding the filler to flow toward the welding seam direction, thereby preventing the collapse of the welding seam due to lack of filler.

[0056] Please refer to Figure 2 and Figure 3 , Figure 2 a schematic view of the first connecting head 110 and the second connecting head 210 in the mounted state is shown, at this time the welding seam is flush with the axial direction of the outer casing 10 and the diffuser 20; Figure 3 a schematic view of the first connecting head 110 and the second connecting head 210 in the assembled and welded state is shown, at this time the welding seam is consistent with the emission direction of the electron beam.

[0057] In one embodiment, the second thickened layer 220 forms a molten platform 240 at the end portion thereof facing the first thickened layer 120; the first thickened layer 120 is concavely arranged at the end portion thereof facing the second thickened layer 220, and the molten platform 240 and the concave portion of the first thickened layer 120 form the collection area 230.

[0058] That is, the first thickened layer 120 is concavely arranged in the direction toward the diffuser 20 with the thickness gradually decreasing, while the second thickened layer 220 is further thickened at the concave area thereof facing the first thickened layer 120 to form the molten platform 240.

[0059] During the welding of the outer casing 10 and the diffuser 20, the molten platform 240 is located below the first thickened layer 120, and the first thickened layer 120 will flow toward the molten platform 240 due to its own gravity, while the molten platform 240 will also flow toward the welding seam due to its own thickness and height, thereby forming a flow trend toward the welding seam in the collection area 230, so that the first thickened layer 120 and the molten platform 240 realize self-filling during the electron beam welding process, thereby avoiding the collapse of the welding seam due to lack of filler.

[0060] Specifically, the first connecting head 110 and the second connecting head 210 are formed with a connecting weld 130, which has an electron beam welding inlet end and an electron beam welding outlet end. The collection area 230 is located at the electron beam welding inlet end, and the second connecting head 210 is provided with a positioning table 250 at the electron beam welding outlet end to extend the extension length of the connecting weld 130.

[0061] Specifically, the first connecting head 110 and the second connecting head 210 are formed with a connecting weld 130, which has an electron beam welding inlet end and an electron beam welding outlet end. The collection area 230 is located at the electron beam welding inlet end, and the second connecting head 210 is provided with a positioning table 250 at the electron beam welding outlet end to extend the extension length of the connecting weld 130. Figure 3 During the welding of the outer casing 10 and the diffuser 20, the extension length of the weld is vertical, which is completely consistent with the electron beam emission path of the electron beam welding device, and thus the electron beam completely flows along the extension direction of the weld, thereby ensuring the welding quality between the outer casing 10 and the diffuser 20.

[0062] The positioning table 250 is arranged to limit the connecting position of the first connecting head 110 of the outer casing 10 and the second connecting head 210 of the diffuser 20.

[0063] That is, when the outer casing 10 and the diffuser 20 are welded, the outer casing 10 and the diffuser 20 need to be rotated by 90 degrees, at which time the outer casing 10 is located obliquely above the diffuser 20. At this time, the positioning table 250 is used to support the outer casing 10 and to make the outer casing 10 completely fit with the diffuser 20, so as to avoid that the weld is too large and affects the welding quality.

[0064] Specifically, the positioning table 250 has a first positioning surface 251 on the side facing the outer casing 10, and the outer casing 10 has a second positioning surface 140 on the side facing the positioning table 250. In the assembled state of the outer casing 10 and the diffuser 20, the first positioning surface 251 and the second positioning surface 140 abut, so that the positioning table 250 forms a positioning support for the outer casing 10.

[0065] In the welded state, the first positioning surface 251 is in a horizontal direction, at which time the second positioning surface 140 of the outer casing 10 can be directly matched with it, which is convenient to assemble and has higher precision.

[0066] In an embodiment, the first thickened layer 120 is arranged integrally with the diffuser 20, and the second thickened layer 220 is arranged integrally with the outer casing 10.

[0067] That is, the first thickened layer 120 and the second thickened layer 220 are reserved when the outer casing 10 and the diffuser 20 are processed, thereby meeting the welding requirements.

[0068] In conclusion, the welding seam formed between the first connecting head 110 of the outer casing 10 and the second connecting head 210 of the diffuser 20 is parallel to the axis of the outer casing 10 and the diffuser 20, so that when the outer casing 10 and the diffuser 20 need to be welded, the outer casing 10 and the diffuser 20 can be horizontally turned by 90 degrees, so that the electron beam can weld the outer casing 10 and the diffuser 20 from top to bottom, and the welding is convenient.

[0069] The thickened layer is arranged on the outer circumferential side of the diffuser 20 and the outer casing 10, so as to ensure the strength of the welding position.

[0070] The second connecting head 210 of the diffuser 20 is provided with a positioning table 250, which can be used for axial positioning when the outer casing 10 is welded, improves the assembly precision of the outer casing 10 and the diffuser 20, and prevents the molten slag from splashing during welding.

[0071] After the diffuser 20 and the outer casing 10 are welded, the thickened layer arranged on the outer side of the diffuser 20 and the outer casing 10 is removed, so as to reduce the weight of the connection position of the diffuser 20 and the outer casing 10.

[0072] The application also provides an aero-engine comprising the above-mentioned combustion chamber, so as to have all the beneficial effects of the combustion chamber, which will not be repeated here.

[0073] Please refer to Figure 4 The application also provides a combustion chamber assembly welding method for the above-mentioned combustion chamber, which comprises the following steps.

[0074] S110, aligning the first connecting head of the outer casing and the second connecting head of the diffuser.

[0075] S120, welding the outer casing and the diffuser from the mounting state to the assembly welding state; in the assembly welding state, the first connecting head and the second connecting head are vertically arranged at the alignment position.

[0076] S130, welding the first connecting head and the second connecting head in the vertical direction by using an electron beam.

[0077] It should be noted that after the outer casing and the diffuser are welded, the thickened layer on the outer circumferential side of the outer casing and the diffuser is removed.

[0078] The welding between the outer casing and the diffuser is carried out on a positioning tool, and the positioning tool can be rotated by a specified angle to facilitate the welding of the outer casing and the diffuser.

[0079] Specifically, the first connecting head and the second connecting head can be aligned first, and then the outer casing and the diffuser are rotated together by 90 degrees to the assembly welding state, at this time the emission path of the electron beam is completely consistent with the extension path of the connecting surface of the first connecting head and the second connecting head, so that the electron beam can weld the outer casing and the diffuser along the extension path of the connecting surface of the first connecting head and the second connecting head.

[0080] In the initial state, the connecting surface of the first connecting head and the second connecting head is in a horizontal direction and is consistent with the axial direction of the outer casing and the diffuser. When welding of the outer casing and the diffuser is needed, the first connecting head and the second connecting head need to be rotated to a vertical state, that is, rotated by 90 degrees, so that the matching of the weld between the first connecting head and the second connecting head and the emission path of the electron beam is simpler and more accurate.

[0081] The present application uses specific words to describe the embodiments of the present 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 present application. Therefore, it should be emphasized and noted that the "an embodiment" or "one embodiment" or "an alternative embodiment" mentioned in different positions in the 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 properly combined.

[0082] Although the present application is disclosed with the preferred embodiments as above, it is not intended to limit the present application, and any person skilled in the art can make possible changes and modifications without departing from the spirit and scope of the present application. Therefore, any modification, equivalent change and modification made to the above embodiments according to the technical essence of the present application, without departing from the technical solution of the present application, fall within the protection scope defined by the claims of the present application.

Claims

1. A combustion chamber, characterized in that, include: The outer casing has a first connector on its inner side; The diffuser has a second connector on its outer side corresponding to the first connector end; wherein, The outer casing and the diffuser are welded at the first connector and the second connector, and the weld is parallel to the axial direction of the outer casing and the diffuser.

2. The combustion chamber according to claim 1, characterized in that, The outer casing has a first thickened layer on its outer periphery, and the diffuser has a second thickened layer on its outer periphery. The second thickening layer is thicker than the first thickening layer, and the second thickening layer forms a concave convergence area between the second thickening layer and the first thickening layer at one end facing the first thickening layer.

3. The combustion chamber according to claim 2, characterized in that, The second thickened layer forms a fusion stage at its end facing the first thickened layer; the first thickened layer is recessed at its end facing the second thickened layer, and the fusion stage and the recessed portion of the first thickened layer form the collection area.

4. The combustion chamber according to claim 3, characterized in that, A connecting weld is formed at the first connector and the second connector, and the connecting weld has an electron beam welding inlet end and an electron beam welding outlet end; The collection area is located at the electron beam welding inlet end, and the second connector is provided with a positioning platform at the electron beam welding outlet end to extend the extension length of the connecting weld.

5. The combustion chamber according to claim 4, characterized in that, The positioning platform has a first positioning surface on the side facing the outer casing, and the outer casing has a second positioning surface on the side facing the positioning platform. When the outer casing and the diffuser are welded together, the first positioning surface and the second positioning surface abut against each other, so that the positioning platform provides positioning support for the outer casing.

6. The combustion chamber according to claim 4, characterized in that, The electron beam welding inlet is located within the collection area.

7. The combustion chamber according to claim 2, characterized in that, The first thickened layer is integrally formed with the diffuser; The second thickened layer is integrally formed with the outer casing.

8. An aircraft engine, characterized in that, include: The combustion chamber as described in any one of claims 1-7.

9. A combustion chamber assembly welding method, used for the combustion chamber as described in any one of claims 1-7, characterized in that, The methods include: Align the first connector of the outer casing with the second connector of the diffuser; The external casing and diffuser are transitioned from the installed state to the welded state; wherein, in the welded state, the first connector and the second connector are vertically aligned at their points; The first connector and the second connector are welded in a vertical direction using electron beam welding.

10. The combustion chamber assembly welding method according to claim 9, characterized in that, After the outer casing and the diffuser are welded together, the thickened layer on the outer periphery of the outer casing and the diffuser is removed.

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