A combustion chamber, assembly tool, structure and method

Abstract

The application provides a combustion chamber, an assembling tool, a structure and a method. The assembling tool is used for assembling a flame tube assembly and comprises a base, a plurality of limiting rods and a positioning member. The base comprises a first axial limiting part and a second axial limiting part. The first axial limiting part is located on the radial inner side of the second axial limiting part. The first axial limiting part is used for abutting against the inner ring tail part of the flame tube. The second axial limiting part is used for abutting against the outer ring tail part of the flame tube. The plurality of limiting rods are distributed on the radial outer side of the second axial limiting part. The limiting rods are provided with limiting holes in the radial direction. The positioning member is used for connecting the limiting holes and connecting holes of an outer cap cover. The connecting holes are used for connecting with an outer casing of the combustion chamber.

Description

TECHNICAL FIELD

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

[0002] In the aero-engine combustion chamber components, the flame tube assembly is assembled in the combustion chamber case, which is used to organize the flame combustion and isolate the high-temperature and high-pressure gas from the combustion chamber case. When the combustion chamber components are assembled with the high-pressure turbine, the tail of the combustion chamber flame tube inner and outer rings needs to be tightly attached to the front sealing piece of the first stage guide vane of the high-pressure turbine to prevent gas leakage at the sealing part. SUMMARY

[0003] The purpose of the present application is to provide an assembly tool.

[0004] Another purpose of the present application is to provide an assembly structure.

[0005] Still another purpose of the present application is to provide a combustion chamber.

[0006] Still another purpose of the present application is to provide an assembly method.

[0007] According to one aspect of the present application, an assembly tool for assembling a flame tube assembly, the flame tube assembly comprising a flame tube outer ring, a flame tube inner ring and an outer cap, comprises: a base comprising a first axial limiting portion and a second axial limiting portion, the first axial limiting portion being located radially inward of the second axial limiting portion, the first axial limiting portion being used to abut against the tail of the flame tube inner ring, and the second axial limiting portion being used to abut against the tail of the flame tube outer ring; a plurality of limiting rods distributed radially outward of the second axial limiting portion, the limiting rods being provided with limiting holes in the radial direction; and a positioning member used to connect the limiting holes and connecting holes of the outer cap, the connecting holes being used to connect with the combustion chamber outer case; wherein the distance between the axis of the limiting hole and the first axial limiting portion is a first distance, the distance between the axis of the limiting hole and the second axial limiting portion is a second distance, the first distance and the second distance are respectively the theoretical distance of the axis of the connecting hole and the tail of the flame tube inner ring and the tail of the flame tube outer ring, and the theoretical distance has a theoretical tolerance band, the theoretical tolerance band being [-0.5mm, 0.5mm].

[0008] The technical scheme of the present application sets the first distance and the second distance of the assembly fixture of the embodiment to the theoretical distance from the axis of the connecting hole in the theoretical model to the tail of the inner ring of the flame tube and the tail of the outer ring of the flame tube, and calculates the size chain and tightens to obtain the theoretical tolerance range that the first distance and the second distance can allow by the extreme value method, which covers the deformation amount of the thin-walled part. The axial distance of the assembled flame tube assembly is even deviated due to deformation, and the deviation is within the required theoretical tolerance range, which can effectively prevent the problem that the subsequent flame tube assembly and the combustion chamber outer casing cannot be tightly fitted with the front sealing piece of the first stage guide vane of the high-pressure turbine, thereby causing leakage, and realizes that the flame tube assembly is assembled once, which meets the requirements, avoids repeated disassembly of the parts, causes the parts to be knocked and scrapped, prolongs the assembly process, and improves the assembly efficiency.

[0009] In one or more embodiments of the assembly fixture, the base further comprises a first radial limiting portion and a second radial limiting portion for radially limiting the flame tube assembly, the first radial limiting portion is formed by the radially inner side of the first axial limiting portion protruding upward along the axial direction, and the second radial limiting portion is formed by the radially outer side of the second axial limiting portion protruding upward along the axial direction.

[0010] In one or more embodiments of the assembly fixture, the base further comprises an arc-shaped sliding groove opened in the circumferential direction, the bottom side of the limiting rod comprises an arc-shaped sliding block matched with the arc-shaped sliding groove, and the arc-shaped sliding block is arranged in the arc-shaped sliding groove to enable the limiting rod to be installed on the base and to be slidable along the arc-shaped sliding groove.

[0011] In one or more embodiments of the assembly fixture, the gap between the outer diameter of the positioning member and the inner diameter of the limiting hole and the inner diameter of the connecting hole is less than or equal to 0.1 mm.

[0012] In one or more embodiments of the assembly fixture, the base is provided with a weight-reducing hole.

[0013] According to another aspect of the present application, an assembly structure comprises the assembly fixture and a flame tube assembly, the flame tube assembly comprising: a flame tube inner ring comprising an inner ring tail portion, the inner ring tail portion being in abutment with the first axial limiting portion of the assembly fixture; a flame tube outer ring located radially outward of the flame tube inner ring, comprising an outer ring head portion and an outer ring tail portion, the outer ring tail portion being in abutment with the second axial limiting portion of the assembly fixture; and an outer cap cover sleeved radially outward of the outer ring head portion, comprising a connecting hole distributed in the circumferential direction, the limiting hole of the assembly fixture being connected with the connecting hole through the positioning member of the assembly fixture.

[0014] In one or more embodiments of the assembly structure, the connecting hole comprises a precision bolt hole and a common bolt hole, and the limiting hole is connected with the precision bolt hole through the positioning member.

[0015] In one or more embodiments of the assembly structure, the tail of the inner ring has a gap with the first radial limiting part of the assembly tool in the radial direction, and the tail of the outer ring has a gap with the second radial limiting part of the assembly tool in the radial direction.

[0016] According to another aspect of the present application, a combustion chamber comprises an outer casing, a rear flange, a high-pressure turbine first-stage guide vane outer ring sealing piece, a high-pressure turbine first-stage guide vane inner ring sealing piece, and a flame tube assembly assembled by using the assembly tool as described above, the connecting hole of the outer cap of the flame tube assembly is connected with the bolt hole of the outer casing through a bolt, and the tail of the flame tube outer ring and the tail of the flame tube inner ring are respectively attached to the high-pressure turbine first-stage guide vane outer ring sealing piece and the high-pressure turbine first-stage guide vane inner ring sealing piece.

[0017] According to another aspect of the present application, an assembly method is used for assembling a flame tube assembly, the flame tube assembly comprising a flame tube outer ring, a flame tube inner ring, a head adapter, and an outer cap, and the assembly method comprises the following steps: S1. placing the flame tube inner and outer rings on the base of the assembly tool, the tail of the flame tube inner ring abutting against the first axial limiting part of the base, and the tail of the flame tube outer ring abutting against the second axial limiting part of the base; S2. placing the head adapter in the accommodating space formed by the flame tube outer ring and the flame tube inner ring; and S3. sleeving the outer cap on the radial outer side of the head of the flame tube outer ring, and connecting the connecting hole of the outer cap with the limiting hole of the assembly tool by using the positioning member of the assembly tool.

[0018] In one or more embodiments of the assembly method, the flame tube assembly further comprises an inner cap, a main vortex, an outer pressure plate, and an inner pressure plate, and the assembly method further comprises the following steps:

[0019] S4. placing the inner cap on the radial inner side of the head of the flame tube inner ring, and placing the main vortex on the mounting platform of the head adapter;

[0020] S5. connecting the radial outer side of the outer pressure plate with the radial outer sides of the outer cap, the flame tube outer ring, and the head adapter by using a bolt and a nut, connecting the radial inner side of the inner pressure plate with the radial inner sides of the inner cap, the flame tube inner ring, and the head adapter, and pressing the main vortex on the mounting platform by the radial inner side of the outer pressure plate and the radial outer side of the inner pressure plate, and leaving a first gap and a second gap with the main vortex;

[0021] S6. Put the filler into the first gap and the second gap, and tighten the bolt;

[0022] S7. Complete the assembly, and take out the filler. BRIEF DESCRIPTION OF DRAWINGS

[0023] The above and other features, aspects and advantages of the present application will become more apparent from the following description of an embodiment thereof, taken in conjunction with the accompanying drawings, which illustrate, by way of example, the principles of the application. In the drawings, like reference numerals refer to like elements throughout. It is to be noted that the drawings are not necessarily drawn to scale and that the specific dimensions and other parameters are intended to be merely illustrative and not limiting of the scope of the application as claimed. In the drawings:

[0024] Figure 1 Structure diagram of a half of the radial direction of the combustion chamber of an embodiment;

[0025] Figure 2 Structure diagram of the assembly structure of an embodiment;

[0026] Figure 3A Structure diagram of a half of the radial direction of the base of the assembly tool of an embodiment;

[0027] Figure 3B Structure diagram of the limiting rod of an embodiment;

[0028] Figure 3C Structure diagram of the cooperation of the outer pressure plate, the bolt and the nut of an embodiment;

[0029] Figure 4 Structure diagram of the assembly structure of an embodiment from another angle;

[0030] Figure 5 Step diagram of the assembly method of an embodiment.

[0031] Reference numerals:

[0032] 100 - combustion chamber, 200 - flame tube assembly, 300 - assembly tool, 400 - assembly structure;

[0033] 1 - outer case, 101 - bolt hole, 102 - rear flange;

[0034] 2 - outer cap, 201 - connecting hole, 202 - precision bolt hole, 203 - ordinary bolt hole;

[0035] 3 - inner cap;

[0036] 4 - outer ring of the flame tube, 401 - tail of the outer ring, 402 - head of the outer ring, 17 - gap;

[0037] 5 - inner ring of flame tube, 501 - tail of inner ring, 502 - head, 52 - second top part;

[0038] 45 - accommodating space;

[0039] 6 - head adapter section, 601 - mounting platform;

[0040] 7 - main vortex finder, 8 - outer pressure plate, 9 - inner pressure plate, 23 - nut, 24 - bolt;

[0041] 10 - outer ring sealing piece of high-pressure turbine first-stage guide vane, 11 - inner ring sealing piece of high-pressure turbine first-stage guide vane;

[0042] 12 - base, 20 - arc-shaped sliding slot, 21 - lightening hole;

[0043] 15 - first axial limiting part, 151 - first radial limiting part;

[0044] 16 - second axial limiting part, 161 - second radial limiting part;

[0045] 13 - limiting rod, 18 - positioning platform, 19 - limiting hole, 22 - arc-shaped sliding block;

[0046] 14 - positioning member. DETAILED DESCRIPTION

[0047] Reference will now be made in detail to various embodiments of the present application, examples of which are illustrated in the accompanying drawings and described below. While the present application will be described in conjunction with the exemplary embodiments, it should be understood that the present application is not limited to the exemplary embodiments. On the contrary, the present application is intended to cover all alternatives, modifications, equivalents and other embodiments that can be included within the spirit and scope of the present application as defined by the appended claims.

[0048] In the following description, the orientation or positional relationship indicated by "front", "back", "upper", "lower", "circumferential", "axial", "radial", "inner", "outer" or other orientation terms is based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or component referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application. In addition, "upper", "lower", "head", "tail", "front", "back" are distinguished based on the actual running direction of the combustion chamber, for example, the gas flows from "front" to "back", from "upper" to "lower".

[0049] Also, specific terminology is used throughout the instant disclosure for the purpose of providing a thorough and complete disclosure. As used herein, the terms "an embodiment" and / or "one embodiment" refer to one or more embodiments of the present application. Also, the use of "adapted to" shall not be construed as being open to pedantry regarding whether a function is performed exactly as stated or whether the function is performed concurrently with other functions. As used herein, the term "about" means approximately or nearly as claimed. For example, the term "about 45 degrees" can mean in the range of 45 degrees plus or minus 10% of 45 degrees. As used herein, the term "coupled" means directly or indirectly connected, linked or associated.

[0050] Flowcharts are used in the instant disclosure to illustrate the operations performed by systems in accordance with embodiments of the present application. It should be understood that the operations in the figures are not necessarily performed in the precise order shown. Other operations that are not depicted can be incorporated into the processes, or a number of the operations can be deleted or combined. Additionally, for the sake of conciseness, the combustion chamber and assembly tool are radially symmetric structures, and thus only one half of the combustion chamber and assembly tool is shown in the figures. Figure 1 , FIG. 3A only shows one half of the combustion chamber and assembly tool in the radial direction.

[0051] Currently, as the assembly requirements of the combustion chamber and high pressure turbine are increasingly improved, the assembly tool needs to be further improved.

[0052] The inventors of the present application have found through in-depth research that, in order to ensure that no leakage occurs at the assembly seal of the combustion chamber component and the high pressure turbine, it is necessary to ensure that the distance between the combustion chamber case rear flange and the tail of the inner and outer rings of the flame tube is within a certain tolerance range. In the design process, the extreme value method is used to calculate the size chain and decompose it into each related part. In theory, as long as the calculation result obtained by calculating the size chain according to the extreme value method meets the requirements, the flame tube assembly can meet the tolerance requirements of the distance between the combustion chamber case rear flange and the tail of the inner and outer rings of the flame tube after being assembled with the combustion chamber case. However, the inventors have found in long-term practice that, in the actual assembly process of the flame tube assembly and the combustion chamber case, the distance between the combustion chamber case rear flange and the tail of the inner and outer rings of the flame tube usually exceeds the required tolerance range. After careful and in-depth analysis of the reasons, it is determined that the deformation of thin-walled parts is the cause. The main parts of the flame tube assembly are thin-walled parts, and the thin-walled parts have a large amount of deformation after being removed from the clamping tool of the machine tool after mechanical processing is completed. In addition, during the assembly process, the size is also prone to change due to the influence of various external factors such as changes in room temperature, etc., thereby making the tolerance of the distance between the combustion chamber case rear flange and the tail of the inner and outer rings of the flame tube unable to meet the requirements. In addition, the usual method to solve the problem of non-compliance of the flame tube assembly is to disassemble and reassemble multiple times according to the actual assembly situation until the requirements are met. However, the combustion chamber component involves a large number of sub-assemblies, and the re-disassembly and assembly work is extremely large, which prolongs the assembly process, reduces the assembly efficiency, and is prone to damage the parts due to knocking.

[0053] Based on the above considerations, the inventors have conducted in-depth research and designed an assembly tool. By setting the first axial limiting portion, the second axial limiting portion, the limiting hole, and the positioning piece, the first distance and the second distance of the assembly tool of the embodiment are designed as the theoretical distance from the axis of the connecting hole in the theoretical model to the tail of the inner ring of the flame tube and the tail of the outer ring of the flame tube. The first distance and the second distance can allow the theoretical tolerance range to be calculated by the extreme value method and to be strictly obtained. The deformation amount of the thin-walled part is covered. The axial distance of the assembled flame tube assembly even deviates due to deformation. The deviation is within the required theoretical tolerance range. The problem that the subsequent flame tube assembly and the combustion chamber outer casing cannot be tightly fitted with the first stage guide vane front sealing piece of the high-pressure turbine to cause leakage can be effectively prevented. The flame tube assembly can be assembled once to meet the requirements. The repeated disassembly of the parts can be avoided to cause the parts to be damaged and scrapped and the assembly process to be prolonged. The assembly efficiency is improved.

[0054] Although the assembly tool disclosed in the embodiments of the present application is suitable for the combustion chamber flame tube assembly of an aero-engine to achieve the effect of improving the assembly efficiency, it is not limited thereto. As long as the concept of the assembly tool disclosed in the embodiments of the present application can be applied to improve the assembly accuracy.

[0055] To ensure good sealing effect, different models have different tolerance requirements for the distance between the combustion chamber casing rear flange and the tail of the inner and outer rings of the flame tube. The present application takes a certain model as an example. The distance L1 between the front end face of the combustion chamber casing rear flange 102 and the tail 401 of the outer ring of the flame tube 4 and the distance L2 between the tail 501 of the inner ring of the flame tube 5 are required to have a tolerance band of [-1mm, 1mm], as shown in Figure 1The structural schematic diagram of the combustion chamber 100 of a certain engine model is shown, which comprises an outer casing 1 and a flame tube assembly 200. The flame tube assembly 200 comprises an outer cap 2, an inner cap 3, a flame tube outer ring 4, a flame tube inner ring 5, a head adapter 6, and a main vortex 7. The flame tube outer ring 4 is located radially outside the flame tube inner ring 5. The outer cap 2 is sleeved radially outside the head 402 of the flame tube outer ring 4. The inner cap 3 is sleeved radially inside the head 502 of the flame tube inner ring 5. The head adapter 6 is placed in the containing space 45 formed by the flame tube outer ring 4 and the flame tube inner ring 5. The main vortex 7 is installed on the installation platform 601 of the head adapter 6. The flame tube assembly 200 further comprises an outer pressure plate 8 and an inner pressure plate 9. The radially outer side of the outer pressure plate 8 is provided with holes corresponding to the radially outer sides of the outer cap 2, the flame tube outer ring 4, and the head adapter 6. The radially outer side of the outer pressure plate 8, the outer cap 2, the flame tube outer ring 4, and the radially outer side of the head adapter 6 are connected by bolts 24 and nuts 23. The radially inner side of the outer pressure plate 8 presses the radially outer side of the main vortex 7 on the installation platform 601. The radially inner side of the inner pressure plate 9 is provided with holes corresponding to the radially inner sides of the inner cap 3, the flame tube inner ring 5, and the head adapter 6. The radially inner side of the inner pressure plate 9, the inner cap 3, the flame tube inner ring 5, and the radially inner side of the head adapter 6 are connected by bolts 24 and nuts 23. The radially outer side of the inner pressure plate 9 presses the radially inner side of the main vortex 7 on the installation platform 601. In order to ensure that the main vortex 7 can be allowed to shake on the head adapter 6 without being stuck, a gap of 0.1mm is left between the main vortex 7 and the installation platform 601 of the head adapter 6. The flame tube assembly 200 is assembled on the radially inner side of the outer casing 1 of the combustion chamber 100 through the connection holes 201 on the outer cap 2 corresponding to the bolt holes of the outer casing 1 of the combustion chamber 100. The connection holes 201 are located at the head of the outer cap 2. The outer ring tail 401 of the flame tube outer ring 4 is sealed with the outer ring sealing piece 10 of the first stage guide vane of the high-pressure turbine. The inner ring tail 501 of the flame tube inner ring 5 is sealed with the inner ring sealing piece 11 of the first stage guide vane of the high-pressure turbine. In order to ensure that the tolerances of the distances L1 and L2 are within the requirements of [-1mm, 1mm], during the design process, the extremum method is used to calculate the size chain decomposition into each related part, to obtain the tolerance requirements of the distances from the connection holes 201 of the outer cap 2 to the outer ring tail 401 of the flame tube and to the inner ring tail 501 of the flame tube in the flame tube assembly 200. Considering the deformation amount of the thin-walled part in the flame tube assembly 200, the tolerance obtained by the extremum method is the final theoretical tolerance that needs to be met after assembly. Under the requirement of the theoretical tolerance after the sealing, the assembly can meet the tolerance requirement of the distance between the inner and outer ring tails of the flame tube and the rear flange of the combustion chamber outer casing. However, in order to achieve one-time assembly that can meet the above-mentioned theoretical tolerance requirement and improve the assembly efficiency, an assembly tool needs to be used, which is as follows:

[0056] Reference Figures 1 to 3AAs shown, in one embodiment, the specific structure of the assembly tool 300 for assembling the flame tube assembly 200 can include a base 12, a plurality of limiting rods 13, and a positioning member 14. The base 12 includes a first axial limiting portion 15 and a second axial limiting portion 16, the first axial limiting portion 15 is located radially inward of the second axial limiting portion 16, the first axial limiting portion 15 is used to abut the inner ring tail portion 501 of the flame tube, and the second axial limiting portion 16 is used to abut the outer ring tail portion 401 of the flame tube. The plurality of limiting rods 13 are distributed radially outward of the second axial limiting portion 16, and the limiting rods 13 are provided with limiting holes 19 in the radial direction. The positioning member 14 is used to connect the limiting holes 19 and the connecting holes 201 of the outer cap 2, and the connecting holes 201 are used to connect the outer casing 1 of the combustion chamber 100. Among them, the distance between the axis of the limiting hole 19 and the first axial limiting portion 15 is a first distance L5, and the distance between the axis of the limiting hole 19 and the second axial limiting portion 16 is a second distance L6, the first distance L5 and the second distance L6 are respectively the theoretical distance of the axis of the connecting hole 201 and the inner ring tail portion 501 of the flame tube and the outer ring tail portion 401 of the flame tube, and the theoretical distance has a theoretical tolerance band, and the theoretical tolerance band is [-0.5mm, 0.5mm].

[0057] Here, the "first axial limiting portion 15 and the second axial limiting portion 16" means that when assembling, the structure is used to support the inner and outer ring tail portions of the flame tube and cooperate with the limiting hole to limit the axial size of the flame tube assembly, and the structure form is not particularly limited, as long as it has good supporting and limiting effect and can meet the assembly requirements, for example Figure 2 , Figure 3A As shown in the embodiment, the axial height of the first axial limiting portion 15 is flush with the base 12, and the second axial limiting portion 16 is formed by the base 12 protruding upward.

[0058] Here, the "limiting rod 13" means a structure for bearing the limiting hole 19 and ensuring that the distance from the axis of the limiting hole to the inner and outer ring tail portions is constant, and the shape is not limited to the "rod" form in the figure, and can also be a plate or other applicable structure form, and the limiting rod 13 is distributed along the circumference radially outward of the base at the second axial limiting portion.

[0059] Here, the "positioning member 14" means a structure for connecting the limiting hole 19 and the connecting hole 201 of the outer cap 2, and ensuring that the axial size of the flame tube assembly is limited to the first distance and the second distance, and the positioning member 14 can be a positioning pin, a positioning peg, or other structure forms.

[0060] The "theoretical distance" here refers to the distance between the axis of the connecting hole 201 of the outer cap 2 and the tail of the inner ring 501 of the flame tube and the tail of the outer ring 401 of the flame tube in the theoretical model of the flame tube assembly. In actual assembly, the axis of the connecting hole 201 after deformation of the thin-walled part due to various factors such as room temperature deviates from the tail of the inner ring 501 of the flame tube to form a fourth distance L4 and deviates from the tail of the outer ring 401 of the flame tube to form a third distance L3. The third distance L3 and the fourth distance L4 are actual distances, which deviate from the theoretical distance by a certain amount. The deviation needs to be within a theoretical tolerance range to meet the assembly requirements.

[0061] The "theoretical tolerance range" here refers to the theoretical tolerance range obtained by calculating the size chain using the extreme value method based on the tolerance range of the distance L1 and the distance L2. Specifically, the tolerance range of the distance L1 and the distance L2 is required to be [-1mm, 1mm]. Based on the required tolerance range, the extreme value method is used to calculate the size chain, and the deviation of the third distance L3 from the theoretical distance needs to be within a theoretical tolerance range of [-0.65mm, 0.65mm], and the deviation of the fourth distance L4 from the theoretical distance needs to be within a theoretical tolerance range of [-0.85mm, 0.85mm]. Further, considering the problem of deformation of the thin-walled part, the result of calculating the size chain using the extreme value method is tightened to obtain the final theoretical tolerance range of [-0.5mm, 0.5mm], i.e. the deviation of the third distance L3 from the second distance L6 and the deviation of the fourth distance L4 from the first distance L5 need to be within the range of [-0.5mm, 0.5mm]. Through assembly verification, under the requirement of this theoretical tolerance range, the flame tube assembly and the combustor outer casing can meet the requirement that the tolerance range of the distance L1 and the distance L2 is within [-1mm, 1mm] after assembly.

[0062] The beneficial effects of the present embodiment are that by setting the first axial limiting portion, the second axial limiting portion, the limiting hole, and the positioning member, the first distance and the second distance of the assembly tool of the present embodiment are designed to be the theoretical distance between the axis of the connecting hole and the tail of the inner ring of the flame tube and the tail of the outer ring of the flame tube in the theoretical model, and the theoretical tolerance range that the first distance and the second distance can allow is obtained by calculating the size chain using the extreme value method and tightening, which covers the deformation amount of the thin-walled part. The axial distance of the assembled flame tube assembly deviates due to deformation, but the deviation is within the required theoretical tolerance range, which can effectively prevent the problem that the subsequent flame tube assembly and the combustor outer casing cannot tightly fit the high-pressure turbine first-stage guide vane front sealing piece and thus cause leakage, and achieve that the flame tube assembly meets the requirements after one-time assembly, avoids repeated disassembly and assembly of parts, causes parts to be damaged and scrapped due to collision, prolongs the assembly process, and improves the assembly efficiency.

[0063] Reference Figure 2Combining Figure 3A As shown in some embodiments, the specific structure of the base 12 can also include a first radial limiting portion 151 and a second radial limiting portion 161 for limiting the radial position of the flame tube assembly 200. The first radial limiting portion 151 is formed by the radially inner side of the first axial limiting portion 15 extending axially upward, and the second radial limiting portion 161 is formed by the radially outer side of the second axial limiting portion 16 extending axially upward. The beneficial effect of such arrangement is that the first radial limiting portion limits the movement of the inner ring of the flame tube to the radially inner side, and the second radial limiting portion limits the movement of the outer ring of the flame tube to the radially outer side, so as to fix the accommodation space formed by the inner and outer rings of the flame tube, facilitate the installation of the head adapter, and avoid the use of redundant fixing members. The volume of the accommodation space gradually decreases from top to bottom, and the head adapter can be stably placed on the upper side of the accommodation space by only relying on the structure of the inner and outer rings, and will not fall to the bottom.

[0064] Referring to Figures 2 to 4 As shown in some embodiments, the specific structure of the assembly tool 300 can be that the base 12 further includes an arc-shaped sliding groove 20 formed in the circumferential direction, and the bottom side of the limiting rod 13 includes an arc-shaped sliding block 22 matched with the arc-shaped sliding groove 20. The arc-shaped sliding block 22 is arranged in the arc-shaped sliding groove 20, so that the limiting rod 13 is installed on the base 12 and can slide along the arc-shaped sliding groove 20. Figure 3B As shown, the radial dimension of the arc-shaped sliding block 20 is smaller than the radial dimension of the limiting rod 13, so that the arc-shaped sliding block 20 and the bottom side of the limiting rod 13 form a positioning platform 18, which ensures that the limiting rod 13 is assembled to the base 12, and the distance between the limiting hole 19 and the first axial limiting portion 15 and the second axial limiting portion 16 is the first distance and the second distance. The beneficial effect of the present embodiment is that, by arranging the arc-shaped sliding block, on the one hand, the arc-shaped sliding block can position the limiting rod in the axial direction when the limiting rod is assembled to the base, so as to ensure that the first distance and the second distance are the theoretical dimensions required by the design, thereby facilitating the assembly of the assembly tool; on the other hand, the arc-shaped sliding block cooperates with the arc-shaped sliding groove to allow the limiting rod to slide in the circumferential direction, and only the axial dimension is limited, so as to limit the assembly error in the axial direction, and avoid the problem that the limiting hole and the connecting hole cannot be aligned and the positioning member cannot be inserted due to the limitation of the circumferential position.

[0065] Referring to Figure 1 , Figure 2 As shown in some embodiments, the specific structure of the positioning member 14 can be that the gap between the outer diameter of the positioning member 14 and the inner diameter of the limiting hole 19 and the inner diameter of the connecting hole 201 is less than or equal to 0.1 mm. For example, the inner diameter of the connecting hole 201 is 8.15 mm, the inner diameter of the limiting hole 19 is 8.1 mm, and the outer diameter of the positioning member 14 is 8.05 mm, so as to reduce the positioning error and ensure the assembly accuracy of the flame tube assembly, and the deviation of the third distance and the fourth distance from the theoretical distance meets the requirement of the theoretical tolerance band.

[0066] Reference Figure 2 In combination Figure 4 As shown in some embodiments, the specific structure of the base 12 can be that the base 12 is provided with a weight-reducing hole 21. Specifically, in the embodiment shown in the drawings, the weight-reducing hole 21 is located between the first axial limiting portion 15 and the second axial limiting portion 16 in the circumferential direction. The beneficial effect of such an arrangement is that the weight of the assembly tool can be reduced. Figure 2 Figure 4 As shown in the embodiment shown in the drawings, the weight-reducing hole 21 is located between the first axial limiting portion 15 and the second axial limiting portion 16 in the circumferential direction. The beneficial effect of such an arrangement is that the weight of the assembly tool can be reduced.

[0067] Reference Figure 2 As shown in one embodiment, the specific structure of the assembly structure 400 can be that it comprises the assembly tool 300 as described above and the flame tube assembly 200, which comprises the inner ring 5 of the flame tube, the outer ring 4 of the flame tube, and the outer cap 2. The inner ring 5 of the flame tube comprises an inner ring tail portion 501, which abuts against the first axial limiting portion 15 of the assembly tool 300. The outer ring 4 of the flame tube is located radially outward of the inner ring 5 of the flame tube and comprises an outer ring head portion 402 and an outer ring tail portion 401, which abuts against the second axial limiting portion 16 of the assembly tool 300. The outer cap 2 is sleeved radially outward of the outer ring head portion 402 and comprises connecting holes 201 distributed in the circumferential direction, and the limiting hole 19 of the assembly tool 300 is connected with the connecting holes 201 through the positioning member 14 of the assembly tool 300. The beneficial effect of such an arrangement is that the axial distance of the flame tube assembly can be ensured to meet the assembly size requirements, and the distance between the combustion chamber case rear flange and the inner and outer ring tail portions of the flame tube can meet the deviation of the theoretical size within the required tolerance range in one-time assembly, thereby avoiding multiple disassembly and reassembly and improving the assembly efficiency.

[0068] Reference Figure 2 In combination Figure 4 As shown in some embodiments, the specific structure of the assembly structure 400 can be that the connecting holes 201 comprise precision bolt holes 202 and ordinary bolt holes 203, and the limiting hole 19 is connected with the precision bolt holes 2011 through the positioning member 14. The meaning of "precision bolt holes 202" here is that the hole diameter is smaller and the fitting precision is higher, which is a precision fit. Compared with the ordinary bolt holes 203, the hole diameter of the ordinary bolt holes 203 is larger and the fitting precision is ordinary. Specifically, as shown in the drawings, the precision bolt holes 202 are located between the first axial limiting portion 15 and the second axial limiting portion 16 in the circumferential direction, and the ordinary bolt holes 203 are located between the first axial limiting portion 15 and the second axial limiting portion 16 in the circumferential direction. Figure 2 Figure 4 ​​In the shown embodiment, the 10 connecting holes 201 are evenly distributed circumferentially, wherein the precision bolt holes 202 are arranged alternately with the common bolt holes 203, i.e. 5 precision bolt holes 202 are evenly distributed circumferentially. The limiting holes 19 on the limiting rods 13 are connected with the precision bolt holes 202 through the positioning members 14, and the limiting rods 13 are also circumferentially distributed by 5, and the circumferential positions on the base 12 correspond to the precision bolt holes 202. The beneficial effect of such a setting is that the assembly size tolerance can be controlled through the precision bolt holes, the assembly precision is improved, and the requirement of meeting the theoretical tolerance band is guaranteed, and the assembly difficulty of the flame tube assembly and the combustion chamber outer casing is avoided due to the use of all precision bolt holes.

[0069] Reference Figure 2 As shown, in some embodiments, the specific structure of the assembly structure 400 can be that the inner ring tail part 501 has a gap 17 in the radial direction with the first radial limiting part 151 of the assembly tool 300, and the outer ring tail part 401 has a gap 17 in the radial direction with the second radial limiting part 161 of the assembly tool 300. The beneficial effect of such a setting is that the radial limiting parts have a gap with the inner and outer ring tail parts of the flame tube, which facilitates the fine adjustment of the position between the radially adjacent parts during assembly.

[0070] Reference Figure 1 Combination Figure 2 As shown, in one embodiment, the specific structure of the combustion chamber 100 can be that it comprises an outer casing 1, a high-pressure turbine first-stage guide vane outer ring sealing piece 10, a high-pressure turbine first-stage guide vane inner ring sealing piece 11, and a flame tube assembly 200 assembled by using the assembly tool 300 as described above, the connecting holes 201 of the outer cover 2 of the flame tube assembly 200 are connected with the bolt holes 101 of the outer casing 1 through bolts, and the flame tube outer ring tail part 401 and the flame tube inner ring tail part 501 are respectively attached to the high-pressure turbine first-stage guide vane outer ring sealing piece 10 and the high-pressure turbine first-stage guide vane inner ring sealing piece 11. The beneficial effect of such a setting is that the flame tube assembly assembled by using the assembly tool can make the flame tube assembly and the combustion chamber outer casing meet the tolerance requirement of the distance of the rear flange and the inner and outer ring tail parts of the flame tube at one time, guarantee the sealing effect of the flame tube tail part and the front sealing piece of the high-pressure turbine first-stage guide vane, avoid repeated disassembly and adjustment of parts, and improve the assembly efficiency.

[0071] Reference Figures 1 to 5 As shown, in one embodiment, the flame tube assembly 200 comprises a flame tube outer ring 4, a flame tube inner ring 5, a head adapter 6, and an outer cover 2, and the specific steps of the assembly method for assembling the flame tube assembly 200 can be that the assembly tool 300 as described above is used, which comprises:

[0072] S1. Place the inner and outer rings of the flame tube in the base 12 of the assembly tool 300, with the tail 501 of the inner ring abutting the first axial limiting portion 15 of the base 12 and the tail 401 of the outer ring abutting the second axial limiting portion 16 of the base 12; and leaving a gap 17 in the radial direction between the tail 501 of the inner ring and the first radial limiting portion 151 and between the tail 401 of the outer ring and the second radial limiting portion 161, so as to fine-tune the positions of the radially adjacent parts.

[0073] S2. Place the head adapter 6 in the accommodating space 45 formed by the outer ring 4 and the inner ring 5 of the flame tube.

[0074] S3. Fit the outer cap 2 on the radially outer side of the head 402 of the outer ring of the flame tube, and connect the connecting hole 201 of the outer cap 2 with the limiting hole 19 of the assembly tool 300 using the positioning member 14 of the assembly tool 300.

[0075] The beneficial effects of such an arrangement are that the assembly method using the above-mentioned assembly tool can make the flame tube assembly complete at one time to meet the assembly tolerance requirements and improve the assembly efficiency.

[0076] With continued reference to Figures 1 to 5 shown, in some embodiments, the flame tube assembly 200 further comprises an inner cap 3, a main swirler 7, an outer pressure plate 8, and an inner pressure plate 9, and the specific steps of the assembly method can further comprise:

[0077] S4. Place the inner cap 3 on the radially inner side of the head 502 of the inner ring 5 of the flame tube, and place the main swirler 7 on the mounting platform 601 of the head adapter 6.

[0078] S5. Connect the radially outer side of the outer pressure plate 8 with the radially outer side of the outer cap 2, the outer ring 4 of the flame tube, and the head adapter 6, and connect the radially inner side of the inner pressure plate 9 with the radially inner side of the inner cap 3, the inner ring 5 of the flame tube, and the head adapter 6 by means of the bolts 24 cooperating with the nuts 23, and press the radially inner side of the outer pressure plate 8 and the radially outer side of the inner pressure plate 9 against the main swirler 7 on the mounting platform 601, leaving a first gap A and a second gap B with the main swirler 7. The sizes of the first gap A and the second gap B are required to be 0.1 mm.

[0079] S6. Put a filler (not shown in the figure) in the first gap A and the second gap B, and tighten the bolts 24. The thickness of the filler is 0.1 mm, and in some embodiments, the filler is a plug gauge of 0.1 mm to ensure dimensional accuracy.

[0080] S7. Complete the assembly and remove the filler.

[0081] Due to the restriction of the first distance L5 and the second distance L6 on the assembly tool, the third distance L3 and the fourth distance L4 after assembly fully meet the design requirements.

[0082] To sum up, the beneficial effects of the combustion chamber, the assembly tool, the structure and the method introduced in the above embodiments include but are not limited to one or a combination of the following:

[0083] 1. The assembly tool of the present application is designed by setting the first axial limiting part, the second axial limiting part, the limiting hole and the positioning piece, the first distance and the second distance of the assembly tool of the present application are designed as the theoretical distance from the axis of the connecting hole in the theoretical model to the tail of the inner ring of the flame tube and the tail of the outer ring of the flame tube, and the first distance and the second distance are calculated by the extreme value method to obtain the theoretical tolerance range that can be allowed, which covers the deformation amount of the thin-walled part, and the axial distance of the flame tube assembly after assembly is deviated due to deformation, and the deviation is within the required theoretical tolerance range, which can effectively prevent the problem that the subsequent flame tube assembly and the combustion chamber outer casing cannot be tightly fitted with the front sealing piece of the first stage guide vane of the high-pressure turbine, thereby causing leakage, realizes one-time assembly of the flame tube assembly, avoids repeated disassembly and assembly of the parts, causes the parts to be knocked and scrapped, prolongs the assembly process, and improves the assembly efficiency.

[0084] 2. The assembly structure of the present application can ensure that the axial distance of the flame tube assembly meets the assembly size requirement, and one-time assembly can meet the requirement that the deviation of the distance between the rear flange of the combustion chamber casing and the tail of the inner and outer rings of the flame tube from the theoretical size is within the required tolerance range, thereby avoiding multiple disassembly and reassembly, and improving the assembly efficiency.

[0085] 3. The combustion chamber of the present application adopts the flame tube assembly assembled by the assembly tool, and one-time assembly can make the flame tube assembly and the combustion chamber outer casing meet the tolerance requirement of the distance between the rear flange and the tail of the inner and outer rings of the flame tube, ensure the sealing effect of the tail of the flame tube and the front sealing piece of the first stage guide vane of the high-pressure turbine, avoid repeated disassembly and adjustment of the parts, and improve the assembly efficiency.

[0086] 4. The assembly method of the present application can make the flame tube assembly one-time assembly complete to meet the assembly tolerance requirement and improve the assembly efficiency.

[0087] Although the present application is disclosed with the above preferred embodiments, 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, which does not deviate from the technical solution of the present application, falls within the protection scope defined by the claims of the present application.

Claims

1. An assembly tool for assembling a flame tube assembly, the flame tube assembly comprising a flame tube outer ring, a flame tube inner ring, an outer shroud, characterized in that, The base comprises a first axial limiting part and a second axial limiting part, the first axial limiting part is located radially inside the second axial limiting part, the first axial limiting part is used for abutting with the inner ring tail of the flame tube, and the second axial limiting part is used for abutting with the outer ring tail of the flame tube. A plurality of limiting rods are distributed radially outside the second axial limiting part, and the limiting rods are provided with limiting holes in the radial direction. A positioning member is used for connecting the limiting hole and the connecting hole of the outer cap, and the connecting hole is used for connecting with the outer casing of the combustion chamber. The distance between the axis of the limiting hole and the first axial limiting part is a first distance, the distance between the axis of the limiting hole and the second axial limiting part is a second distance, the first distance and the second distance are respectively the theoretical distance of the axis of the connecting hole and the inner ring tail of the flame tube and the outer ring tail of the flame tube, the theoretical distance has a theoretical tolerance band, and the theoretical tolerance band is [-0.5mm, 0.5mm]. The base further comprises a first radial limiting part and a second radial limiting part, which are used for radially limiting the flame tube assembly, the first radial limiting part is formed by protruding upward along the axial direction from the radially inner side of the first axial limiting part, and the second radial limiting part is formed by protruding upward along the axial direction from the radially outer side of the second axial limiting part.

2. The assembly tool of claim 1, wherein, The base further comprises an arc-shaped sliding groove arranged in the circumferential direction, the bottom side of the limiting rod comprises an arc-shaped sliding block matched with the arc-shaped sliding groove, and the arc-shaped sliding block is arranged in the arc-shaped sliding groove, so that the limiting rod is installed on the base and can slide along the arc-shaped sliding groove.

3. The assembly tool of claim 1, wherein, The gap between the outer diameter of the positioning member and the inner diameter of the limiting hole and the inner diameter of the connecting hole is less than or equal to 0.1mm.

4. The assembly tool of claim 1, wherein, The base is provided with a weight-reducing hole.

5. The assembly tool of claim 1, wherein, The assembly tool comprises the flame tube assembly and the assembly tool, the inner ring of the flame tube assembly comprises an inner ring tail, the outer ring of the flame tube assembly is located radially outside the inner ring of the flame tube assembly and comprises an outer ring head and an outer ring tail, and the outer cap is sleeved radially outside the outer ring head and comprises the connecting hole arranged in the circumferential direction.

6. An assembly structure characterized by, The connecting hole comprises a precision bolt hole and a common bolt hole, and the limiting hole is connected with the precision bolt hole through the positioning member. The inner ring tail has a gap radially with the first radial limiting part of the assembly tool, and the outer ring tail has a gap radially with the second radial limiting part of the assembly tool.

7. The assembly of claim 6, wherein, The assembly tool comprises an outer casing, a high-pressure turbine first-stage guide vane outer ring sealing piece, a high-pressure turbine first-stage guide vane inner ring sealing piece, and a flame tube assembly assembled by using the assembly tool, the connecting hole of the outer cap of the flame tube assembly is connected with the bolt hole of the outer casing through a bolt, and the tail of the outer ring of the flame tube and the tail of the inner ring of the flame tube are respectively matched with the high-pressure turbine first-stage guide vane outer ring sealing piece and the high-pressure turbine first-stage guide vane inner ring sealing piece for sealing.

8. The assembly of claim 6, wherein, The assembly tool comprises the flame tube assembly and the assembly tool, the inner ring of the flame tube assembly comprises an inner ring tail, the outer ring of the flame tube assembly is located radially outside the inner ring of the flame tube assembly and comprises an outer ring head and an outer ring tail, and the outer cap is sleeved radially outside the outer ring head and comprises the connecting hole arranged in the circumferential direction.

9. A combustion chamber, characterized by ​ 10. A method of assembly for assembling a flame tube assembly, the flame tube assembly comprising a flame tube outer ring, a flame tube inner ring, a head adapter section, an outer cap, characterized in that, ​ S1. Place the inner and outer rings of the flame tube in the base of the assembly tool, with the tail of the inner ring abutting the first axial limiting portion of the base and the tail of the outer ring abutting the second axial limiting portion of the base; S2. Place the head adapter in the accommodating space formed by the outer ring and the inner ring of the flame tube; S3. Place the outer cap on the radial outer side of the head of the outer ring of the flame tube, and connect the connecting hole of the outer cap to the limiting hole of the assembly tool using the positioning member of the assembly tool.

11. The method of assembling according to claim 10, wherein, The flame tube assembly further comprises an inner cap, a main vortex finder, an outer pressure plate, and an inner pressure plate, and the assembly method further comprises: S4. Place the inner cap on the radial inner side of the head of the inner ring of the flame tube, and place the main vortex finder on the mounting platform of the head adapter; S5. Connect the radial outer side of the outer pressure plate to the radial outer sides of the outer cap, the outer ring of the flame tube, and the head adapter by screwing the nut, and connect the radial inner side of the inner pressure plate to the radial inner sides of the inner cap, the inner ring of the flame tube, and the head adapter, with the radial inner side of the outer pressure plate and the radial outer side of the inner pressure plate pressing the main vortex finder against the mounting platform and leaving a first gap and a second gap with the main vortex finder; S6. Place a filler in the first gap and the second gap, and tighten the bolt; S7. Complete the assembly and remove the filler.

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