Combustion chamber, combustion chamber assembly welding method and aero-engine

Abstract

The invention provides a combustion chamber, a combustion chamber assembly welding method and an aero-engine, the combustion chamber comprises an outer casing and a diffuser, and the inner side of the outer casing is provided with a first connector; a second connector corresponding to the first connecting end is arranged on the outer side of the diffuser; wherein the outer casing and the diffuser are welded at the positions of the first connector and the second connector, and a welding seam is parallel to the axial direction of the outer casing and the axial direction of the diffuser. The combustion chamber is provided. The welding seam formed among the combustion chamber, the first connector of the outer casing and the second connector of the diffuser is parallel to the axis of the outer casing and the axis of the diffuser, so that when the outer casing and the diffuser need to be welded, the outer casing and the diffuser can be horizontally overturned by 90 degrees; therefore, the electron beam can weld the outer casing and the diffuser from top to bottom, and welding is convenient.

Description

Technical Field

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

[0002] Modern high bypass ratio turbofan aircraft engines are a type of gas turbine, usually consisting of an air inlet, a fan booster 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 a gas turbine, used to mix high-temperature and high-pressure gas and fuel, and burn them to achieve the purpose of heating and pressurization.

[0003] The airflow speed from the compressor to the combustion chamber is very high, which can reach between 120m / s and 220m / s. It is difficult for fuel to burn stably in such a high-speed airflow. In order to reduce the speed and increase the pressure of the gas transmitted from the compressor to the combustion chamber to make it more conducive to combustion, a diffuser is generally installed in the combustion chamber. The diffuser is generally connected to the outer casing of the combustion chamber by bolting or welding, 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 to connect the outer casing and diffuser of the combustion chamber is welding. The design of the welding joint will directly affect the connection strength of the outer casing and diffuser as well as the processing cost and difficulty. An unreasonable welding joint will lead to a reduced service life of the connection between the outer casing and the diffuser, or great processing difficulty, and it is difficult to ensure the quality of the weld.

[0005] Based on this, the inventor of the present application proposes a combustion chamber, a combustion chamber assembly welding method 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 defects in the prior art that the welding quality of the outer casing and the diffuser is difficult to ensure, the welding is difficult and the cost is high, and to provide a combustion chamber, a combustion chamber assembly welding method and an aircraft engine.

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

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

[0009] An outer casing having a first connector on its inner side;

[0010] The diffuser has a second connector on the outside thereof corresponding to the first connector; wherein,

[0011] The outer casing and the diffuser are welded at the first connection head and the second connection head, and the weld is parallel to the axial direction of the outer casing and the diffuser.

[0012] According to one embodiment of the present invention, a first thickened layer is provided on the outer peripheral side of the outer casing, and a second thickened layer is provided on the outer peripheral side of the diffuser;

[0013] The second thickened layer is thicker than the first thickened layer, and the second thickened layer forms a concave collecting area between an end portion facing the first thickened layer and the first thickened layer.

[0014] According to one embodiment of the present invention, the second thickened layer forms a melting table at the end facing the first thickened layer; the first thickened layer is concavely arranged at the end facing the second thickened layer, and the melting table and the concave part of the first thickened layer form the gathering area.

[0015] According to one embodiment of the present invention, 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 collecting 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 invention, the positioning platform has a first positioning surface on a side facing the outer casing, and the outer casing has a second positioning surface on a side facing the positioning platform. When the outer casing and the diffuser are welded together, the first positioning surface abuts against the second positioning surface, so that the positioning platform forms a positioning support for the outer casing.

[0018] According to one embodiment of the present invention, the electron beam welding inlet port is located in the collecting area.

[0019] According to one embodiment of the present invention, the first thickened layer is integrally provided with the diffuser;

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

[0021] The present invention also provides an aircraft engine, which is characterized in that it includes: a combustion chamber as described above.

[0022] The present invention also provides a combustion chamber assembly welding method for the combustion chamber as described above, wherein the method comprises:

[0023] Align the first connector of the outer casing with the second connector of the diffuser;

[0024] The outer casing and the diffuser are moved from an installed state to an assembly welding state; wherein, in the assembly welding state, the first connector and the second connector are vertically arranged at an aligned position;

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

[0026] According to an embodiment of the present invention, after the outer casing and the diffuser are welded, the thickened layers on the outer peripheral sides of the outer casing and the diffuser are removed.

[0027] The positive and progressive effects of the present invention are:

[0028] In the combustion chamber of the present invention, the weld formed between the first connector of the outer casing and the second connector of the diffuser is parallel to the axes 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 flipped 90 degrees, so that the electron beam can weld the outer casing and the diffuser from top to bottom, which is convenient for welding.

[0029] The diffuser and the outer casing are both provided with thickened layers on their outer circumference, thus ensuring the strength of the welds.

[0030] A positioning platform is provided at the second connection head of the diffuser, which can be used for axial positioning when welding with the outer casing, thereby improving the assembly accuracy of the outer casing and the diffuser and preventing slag splashing during welding.

[0031] After the diffuser and the outer casing are welded, the weld joint is machined to remove the thickened layer on the outside of the diffuser and the outer casing, thereby reducing the weight of the connection between the diffuser and the outer casing. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] 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:

[0033] Figure 1 It is a partial structural schematic diagram of the combustion chamber of the present invention;

[0034] Figure 2 It is a schematic diagram of the first connector and the second connector of the present invention in an installed state;

[0035] Figure 3 It is a schematic diagram of the first connector and the second connector of the present invention in a welded state;

[0036] Figure 4 The figure is a flow chart of the combustion chamber assembly welding method of the present invention.

[0037] 10. outer casing; 110. first connector; 120. first thickened layer; 130. connecting weld; 140. second positioning surface;

[0038] 20. Diffuser; 210. Second connector; 220. Second thickening layer; 230. Converging area; 240. Melting platform; 250. Positioning platform; 251. First positioning surface. DETAILED DESCRIPTION

[0039] 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.

[0040] 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.

[0041] Please refer to Figures 1 to 3 The present invention provides a combustion chamber, including an outer casing 10 and a diffuser 20, wherein the inner side of the outer casing 10 has a first connector 110. The outer side of the diffuser 20 is provided with a second connector 210 corresponding to the first connector.

[0042] The diffuser 20 is located inside the outer casing 10 . The first connector 110 provided on the outer casing 10 extends toward the diffuser 20 , and the second connector 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 connector 110 and the second connector 210 , and the weld is parallel to the axial direction of the outer casing 10 and the diffuser 20 .

[0044] In the present invention, 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 the positioning fixture, and the electron beam welding device is generally located above the fixture. The emission path of the electron beam is also in a vertical direction, so the outer casing 10 and the diffuser 20 need to be rotated from the initial installation state to the assembly welding state.

[0046] Generally, the initial installation state is that the outer casing 10 is located above the diffuser 20, and the weld 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 90 degrees to the assembly welding state, at which point the weld is in a vertical state, matching the electron beam welding device, and the welding of the outer casing 10 and the diffuser 20 can be completed.

[0047] In order to reduce the length of the weld, conventional welding methods mostly use inclined welding, that is, the weld is perpendicular to the length extension direction of the first connector 110 and the second connector 210. At this time, the extension path of the weld in the first connector 110 and the second connector 210 is the shortest.

[0048] However, in the initial state of this method, the axial angle setting between the weld and the outer casing 10 and the diffuser 20 requires first determining the size of the angle, and then when assembly welding is required, adjusting the extension path of the weld to be consistent with the electron beam emission path.

[0049] However, in practice, it is difficult to make the extension path of the weld completely consistent with the emission path of the electron beam during the adjustment process. This causes an angle between the emission path of the electron beam and the weld, resulting in a cold weld at the connection between the outer casing 10 and the diffuser 20, causing poor welding quality.

[0050] Moreover, due to the limitation of the machining accuracy of the connection between the outer casing 10 and the diffuser 20, the angle between the extension direction of the weld at the connection between the outer casing 10 and the diffuser 20 and the axial direction of the outer casing 10 and the diffuser 20 is difficult to calculate. Both the machining accuracy and the angle calculation will affect the welding quality of the weld.

[0051] Because the connection between the outer casing 10 and the diffuser 20 is mainly supported by welding, if the quality of the weld between the outer casing 10 and the diffuser 20 is poor, it directly leads to a low connection strength between the outer casing 10 and the diffuser 20 .

[0052] In the present invention, the weld between the first connector 110 and the second connector 210 is parallel to the axial direction of the outer casing 10 and the diffuser 20. When welding is required, the respective tooling is directly rotated 90 degrees, which makes it more convenient to control the rotation angle. As a result, it is easier to match the extension direction of the weld with the emission path of the electron beam and the accuracy is easier to control, which is beneficial to improving the welding quality between the outer casing 10 and the diffuser 20, and further improving the connection strength between the outer casing 10 and the diffuser 20.

[0053] Vertical welding does not need to consider the machining accuracy of the ends of the first connector 110 and the second connector 210, and does not affect the welding quality. After the welding is completed, the machining accuracy is eliminated. However, in conventional machining methods, the machining accuracy becomes a factor that affects the angle calculation, making it difficult for the outer casing 10 and the diffuser 20 to rotate to the target angle and target welding position.

[0054] In one embodiment, a first thickened layer 120 is provided on the outer peripheral side of the outer casing 10, and a second thickened layer 220 is provided on the outer peripheral side of the diffuser 20; 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 gathering area 230 between the first thickened layer 120 and one end thereof facing the first thickened layer 120.

[0055] During the electron beam welding process, the connection part between the first connector 110 and the second connector 210 is prone to collapse, so a gathering area 230 is set on the outer peripheral side of the outer casing 10 and the diffuser 20. The first thickened layer 120 and the second thickened layer 220 can be used as self-filling during welding. The gathering area 230 is used to guide the material so that the material flows toward the weld, thereby preventing the weld from collapsing due to lack of material.

[0056] Please refer to Figure 2 and Figure 3 , Figure 2 A schematic diagram showing the first connector 110 and the second connector 210 in an installed state is shown, where the weld is flush with the axial direction of the outer casing 10 and the diffuser 20; Figure 3 The schematic diagram shows the first connection head 110 and the second connection head 210 in a welded state, where the weld is consistent with the emission direction of the electron beam.

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

[0058] That is, the thickness of the first thickened layer 120 decreases gradually in the direction toward the diffuser 20 to form a concave portion, and at the same time, the second thickened layer 220 is further thickened in the concave region toward the first thickened layer 120 to form a melting platform 240 .

[0059] When welding the outer casing 10 and the diffuser 20, the melting table 240 is located below the first thickened layer 120. The first thickened layer 120 will flow toward the melting table 240 due to its own gravity, and the melting table 240 will also flow toward the weld due to its own thickness and height, thereby forming a trend of flowing toward the weld in the gathering area 230. Therefore, during the electron beam welding process, the first thickened layer 120 and the melting table 240 can achieve self-filling and avoid the collapse of the weld due to lack of material.

[0060] Specifically, a connection weld 130 is formed at the first connection head 110 and the second connection head 210. The connection weld 130 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. The second connection head 210 is provided with a positioning platform 250 at the electron beam welding outlet end to extend the extension length of the connection weld 130.

[0061] For details, please refer to Figure 3 During the welding process 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 then the electron beam will flow completely along the extension direction of the weld, thereby ensuring the welding quality between the outer casing 10 and the diffuser 20.

[0062] The positioning platform 250 is provided to define the connection position of the first connection head 110 of the outer casing 10 and the second connection 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 90 degrees. At this time, the outer casing 10 is located obliquely above the diffuser 20. At this time, the positioning platform 250 is used to support the outer casing 10 on the one hand, and to make the outer casing 10 and the diffuser 20 fully fit together on the other hand to avoid the weld being too large and affecting the welding quality.

[0064] Specifically, the positioning platform 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 platform 250 . When the outer casing 10 and the diffuser 20 are welded together, the first positioning surface 251 abuts against the second positioning surface 140 , so that the positioning platform 250 forms a positioning support for the outer casing 10 .

[0065] In the welding state, the first positioning surface 251 is in the horizontal direction. At this time, the second positioning surface 140 of the outer casing 10 can be directly matched with it, which is convenient for assembly and has higher precision.

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

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

[0068] In summary, in the combustion chamber of the present invention, the weld formed between the first connector 110 of the outer casing 10 and the second connector 210 of the diffuser 20 is parallel to the axes of the outer casing 10 and the diffuser 20. Therefore, when it is necessary to weld the outer casing 10 and the diffuser 20, the outer casing 10 and the diffuser 20 can be horizontally flipped 90 degrees, so that the electron beam can weld the outer casing 10 and the diffuser 20 from top to bottom, which is convenient for welding.

[0069] The diffuser 20 and the outer casing 10 are both provided with thickened layers on their outer circumferences, thereby ensuring the strength of the welding points.

[0070] A positioning platform 250 is provided at the second connector 210 of the diffuser 20, which can be used for axial positioning when welding with the outer casing 10, thereby improving the assembly accuracy of the outer casing 10 and the diffuser 20 and preventing slag splashing during welding.

[0071] After the diffuser 20 and the outer casing 10 are welded, the weld joint is machined to remove the thickened layer provided on the outer sides of the diffuser 20 and the outer casing 10, thereby reducing the weight of the connection between the diffuser 20 and the outer casing 10.

[0072] The present invention also provides an aircraft engine, including the above-mentioned combustion chamber, which has all the beneficial effects of the combustion chamber and will not be described in detail here.

[0073] Please refer to Figure 4 The present invention also provides a combustion chamber assembly welding method for the above-mentioned combustion chamber, the method comprising:

[0074] S110, aligning the first connector of the outer casing with the second connector of the diffuser.

[0075] S120, the outer casing and the diffuser are moved from an installed state to an assembled welding state; wherein, in the assembled welding state, the first connector and the second connector are vertically arranged at an aligned position.

[0076] S130, welding the first connector and the second connector along a vertical direction by using electron beam welding.

[0077] It should be noted that after the outer casing and the diffuser are welded, the thickened layers on the outer peripheral sides of the outer casing and the diffuser are removed.

[0078] The welding between the outer casing and the diffuser is performed on a positioning fixture, which can be rotated at a specified angle to facilitate welding of the outer casing and the diffuser.

[0079] Specifically, the first connector and the second connector can be aligned first, and then the outer casing and the diffuser can be rotated 90 degrees together to a welding state. At this time, the emission path of the electron beam is completely consistent with the extension path of the connecting surfaces of the first connector and the second connector. Thus, the electron beam will weld the outer casing and the diffuser along the extension path of the connecting surfaces of the first connector and the second connector.

[0080] In the initial state, the connecting surfaces of the first connector and the second connector are in a horizontal direction and are consistent with the axial direction of the outer casing and the diffuser. When the outer casing and the diffuser need to be welded, the first connector and the second connector need to be turned to a vertical state, that is, rotated 90 degrees, which makes it easier and more accurate to match the weld between the first connector and the second connector with the electron beam emission path.

[0081] 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.

[0082] 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 combustion chamber, characterized in that: include: An outer casing having a first connector on its inner side; The diffuser has a second connector on the outside thereof corresponding to the first connector; wherein, The outer casing and the diffuser are welded at the first connection head and the second connection head, 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 is provided with a first thickened layer on its outer circumference, and the diffuser is provided with a second thickened layer on its outer circumference; The second thickened layer is thicker than the first thickened layer, and the second thickened layer forms a concave collecting area between an end portion facing the first thickened layer and the first thickened layer.

3. The combustion chamber according to claim 2, characterized in that The second thickened layer forms a melting platform at the end facing the first thickened layer; the first thickened layer is concavely arranged at the end facing the second thickened layer, and the melting platform and the concave part of the first thickened layer form the gathering area.

4. The combustion chamber according to claim 3, characterized in that A connecting weld is formed between 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; The collecting 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.

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

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

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

8. An aircraft engine, characterized in that: include: A combustion chamber as claimed in any one of claims 1 to 7.

9. A combustion chamber assembly welding method, used for the combustion chamber according to any one of claims 1 to 7, characterized in that: Methods include: Align the first connector of the outer casing with the second connector of the diffuser; The outer casing and the diffuser are moved from an installed state to an assembly welding state; wherein, in the assembly welding state, the first connector and the second connector are vertically arranged at an aligned position; The first connecting head and the second connecting head are welded in a vertical direction by 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, the thickened layers on the outer peripheral sides of the outer casing and the diffuser are removed.

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