Flame tube outer ring, combustion chamber, installation structure and method

Abstract

This invention provides a flame tube outer ring, a combustion chamber, an installation structure, and a method. The installation structure, used for installing an ignition nozzle onto the flame tube outer ring, includes: a bushing, comprising an extension and a mounting portion, the mounting portion for passing through and installing the ignition nozzle; a positioning ring, comprising a first end and a second end, the first and second ends defining a notch in the positioning ring; and a housing, integrally formed with the flame tube outer ring, comprising an axially connected first and second portion, the first portion providing a first receiving space for accommodating the ignition nozzle, and the second portion providing a second receiving space for accommodating the bushing and the positioning ring; wherein the positioning ring is sleeved on the mounting portion of the bushing, the second ring and the extension of the bushing are located on opposite axial sides of the positioning ring, and the second ring confines the positioning ring and the extension of the bushing within the second receiving space.

Description

Technical Field

[0001] This invention relates to the field of aero-engine combustion chambers, and more particularly to the outer ring of the flame tube, the combustion chamber, the mounting structure, and the method thereof. Background Technology

[0002] The power output of an aero-engine primarily involves thoroughly mixing the high-pressure gas compressed by the high-pressure compressor with aviation kerosene flowing into the combustion chamber from the fuel adapter. This mixture is then ignited by an ignition source, resulting in vigorous combustion and the formation of high-temperature, high-pressure gas. This gas expands through the turbine blades, performing work, and then drives the compressor via the connecting shaft, thus enabling the aero-engine to operate. In this process, the combustion chamber, as a crucial component for organizing combustion in an aero-engine, mainly consists of components such as the diffuser, casing, fuel nozzles, flame tube, and ignition source.

[0003] Currently, many aero-engine combustors employ a double-walled flame tube structure. The outer layer is an impact wall, and the inner layer is a diverging wall. The impact wall has impact cooling holes to cool the diverging wall, while the inner diverging wall has diverging holes to form a gas film on the inner wall of the flame tube, achieving a divergent cooling effect. Many other aero-engine combustors use a single-walled flame tube structure, with cooling holes directly on the wall surface, similarly forming a cooling gas film. The ignition nozzle is directly fixed to the relatively cooler combustor housing and then extends into the flame tube for ignition. During operation, a temperature difference exists between the combustor housing and the flame tube, making them prone to thermal deformation and causing deformation inconsistencies. Therefore, regardless of whether it's a double-walled or single-walled structure, the ignition nozzle's misalignment during assembly can lead to collisions between the flame tube and the ignition nozzle, resulting in nozzle damage. Summary of the Invention

[0004] One object of the present invention is to provide an installation structure.

[0005] Another object of the present invention is to provide an outer ring for a flame tube.

[0006] Another object of the present invention is to provide a combustion chamber.

[0007] Another object of the present invention is to provide an installation method.

[0008] According to one aspect of the present invention, an installation structure for mounting an ignition nozzle to an outer ring of a flame tube includes: a bushing including an extension and a mounting portion, the extension being formed by the mounting portion extending outward, the mounting portion having a through hole for passing through and mounting the ignition nozzle; a positioning ring including a first end and a second end, the first end and the second end defining a notch in the positioning ring, the size of the notch being variable so that the encircling size of the positioning ring is variable; and a housing for integrally disposed with the outer ring of the flame tube, including a first portion and a second portion axially connected, the second portion including a first ring, a second ring, and a connection to the first ring. The first ring is formed by extending the first part outward, and the second ring is formed by extending the connecting wall inward. The first part provides a first receiving space for accommodating the ignition nozzle, and the second part provides a second receiving space formed by the first ring, the second ring, and the connecting wall for accommodating the bushing and the positioning ring. The positioning ring is sleeved on the mounting part of the bushing, and the second ring and the extension of the bushing are located on both axial sides of the positioning ring. The second ring limits the positioning ring and the extension of the bushing within the second receiving space.

[0009] The technical solution of this application integrates the outer shell and the outer ring of the flame tube, placing the mounting structure on the outer ring of the flame tube. Compared to welding, this method not only ensures that the strength is not weakened but also prevents local collapse of the outer ring of the flame tube, guaranteeing the insertion depth of the ignition nozzle into the outer ring of the flame tube. This eliminates the need for manual restoration, saving labor and time costs and ensuring the safe and reliable operation of the engine. Furthermore, by using a positioning ring with a variable notch size to cooperate with the outer shell and limit the bushing, the bushing can move freely within the second receiving space, causing the ignition nozzle to move along with it. This prevents damage to the ignition nozzle from collision with the outer ring of the flame tube due to uneven temperature and vibration loads between the combustion chamber casing and the outer ring of the flame tube. The positioning ring also makes disassembly and assembly very convenient. Compared to welding to create the bushing's movement space, this method facilitates bushing maintenance and replacement, extends service life, and saves costs.

[0010] In one or more embodiments of the mounting structure, the extension abuts against the positioning ring to form a first annular band, the second ring abuts against the positioning ring to form a second annular band, and the first annular band is located inside the second annular band.

[0011] In one or more embodiments of the mounting structure, there is a 0.2 mm gap between the wall of the through hole of the mounting portion of the bushing and the ignition nozzle.

[0012] In one or more embodiments of the mounting structure, the extension of the bushing is provided with a plurality of cooling holes in the circumferential direction.

[0013] In one or more embodiments of the mounting structure, the outer edge of the extension of the bushing has a gap of 1-2 mm with the connecting wall.

[0014] In one or more embodiments of the mounting structure, the first end and the second end of the positioning ring have clamping portions.

[0015] In one or more embodiments of the mounting structure, the clamping portion includes holes formed at the first end and the second end.

[0016] In one or more embodiments of the mounting structure, the upper and lower surfaces of the extension of the bushing are coated with a wear-resistant coating.

[0017] According to another aspect of the present invention, a flame tube outer ring includes a body and a housing with an installation structure as described above. The body surrounds and forms a space. The housing includes a first part and a second part connected in an axial direction. The first part provides a first receiving space, and the second part provides a second receiving space. The first receiving space, the second receiving space, and the space are directly connected.

[0018] According to another aspect of the present invention, a combustion chamber includes an outer casing, a flame tube outer ring, an ignition nozzle, and an installation structure as described above. The ignition nozzle is fixedly connected to the outer casing by a fastener. The outer shell of the installation structure is integrally formed with the flame tube outer ring. The ignition nozzle is installed in the bushing of the installation structure. The ignition end of the ignition nozzle extends into the radially inner side of the flame tube outer ring for ignition.

[0019] According to another aspect of the present invention, an installation method is used to install an ignition nozzle onto the outer ring of a flame tube, employing the installation structure described above, wherein the inner edge of the second ring of the installation structure forms the entrance to the second receiving space of the installation structure, comprising:

[0020] S1. Insert the bushing of the mounting structure into the second receiving space through the inlet;

[0021] S2. The positioning ring of the mounting structure is fitted onto the mounting part of the bushing;

[0022] S3. Narrow the notch of the positioning ring and insert the positioning ring into the second receiving space through the inlet;

[0023] S4. Restore the size of the notch, and the second ring confines the positioning ring and the bushing within the second accommodating space. Attached Figure Description

[0024] The above-described and other features, properties, and advantages of the present invention will become more apparent from the following description taken in conjunction with the accompanying drawings and embodiments, in which the same reference numerals always denote the same features. It should be noted that these drawings are merely illustrative and are not drawn to scale, and should not be construed as limiting the scope of protection actually claimed by the present invention, wherein:

[0025] Figure 1 This is a schematic diagram of the combustion chamber structure of one embodiment;

[0026] Figure 2 This is a schematic diagram of the installation structure of one embodiment;

[0027] Figure 3 This is a schematic diagram of the outer casing of one embodiment;

[0028] Figure 4 This is a schematic diagram of the positioning ring in one embodiment;

[0029] Figure 5 A schematic structural diagram of a bushing according to one embodiment;

[0030] Figure 6 A schematic diagram of the bushing from another perspective of one embodiment;

[0031] Figure 7 This is a flowchart illustrating the steps of an installation method according to one embodiment.

[0032] Figure label:

[0033] 1000 - Combustion chamber;

[0034] 10-Mounting structure, 30-Outer casing, 50-Inner ring of flame tube, 60-Inner and outer caps, 70-Head adapter assembly, 80-Main vortex generator, 90-Front diffuser, 100-Fuel nozzle;

[0035] 20 - Ignition nozzle, 200 - Ignition terminal;

[0036] 40-Outer ring of the flame tube, 401-Main body, 402-Space;

[0037] 1-Bushing, 11-Extension, 111-Outer edge, 12-Mounting part, 13-Through hole;

[0038] 2-Positioning ring, 201-Outer side, 21-First end, 22-Second end, 23-Notch, 24-Clamping part, 241-Hole;

[0039] 3-Outer shell, 31-First part, 301-First receiving space, 32-Second part, 302-Second receiving space, 321-First ring, 322-Second ring, 3221-Inner edge, 323-Connecting wall;

[0040] 41 - First annular band, 42 - Second annular band;

[0041] 5-Cooling holes. Detailed Implementation

[0042] Reference will now be made in detail to various embodiments of the invention, examples of which are shown in the accompanying drawings and described below. Although the invention will be described in conjunction with exemplary embodiments, it should be understood that this specification is not intended to limit the invention to those exemplary embodiments. Rather, the invention is intended to cover not only these exemplary embodiments, but also various alternatives, modifications, equivalents, and other embodiments that may be included within the spirit and scope of the invention as defined by the appended claims.

[0043] In the following description, the terms "upper," "lower," "axial," "circumferential," "inner," "outer," or other directional terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These are used solely for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. It should be noted that "axial" refers to the axial direction of the ignition nozzle and mounting structure, not the axial direction of the combustion chamber.

[0044] Furthermore, this application uses specific terms to describe its embodiments. For example, "an embodiment" and / or "one embodiment" refers to a particular feature, structure, or characteristic associated with at least one embodiment of this application. Therefore, it should be emphasized and noted that "an embodiment" or "one embodiment" mentioned twice or more in different locations in this specification do not necessarily refer to the same embodiment. In addition, certain features, structures, or characteristics in one or more embodiments of this application can be appropriately combined.

[0045] Flowcharts are used in this application to illustrate the operations performed by the system according to embodiments of this application. It should be understood that the preceding or following operations are not necessarily performed in exact order. Other operations may be added to these processes, or one or more operations may be removed from these processes.

[0046] With increasingly stringent requirements for the assembly of ignition nozzles and combustion chambers, there is a need to further improve the installation structure of ignition nozzles.

[0047] To protect the ignition nozzle from the deformation inconsistency between the combustion chamber casing and the flame tube, as well as the vibration load during combustion chamber operation, and to prevent damage caused by collision between the ignition nozzle and the flame tube, a floating mounting device is usually designed to address the problem of uneven temperature and vibration loads on the flame tube and the combustion chamber casing. Existing floating mounting devices are fixed to the flame tube by welding.

[0048] The inventors of this application, through in-depth research, discovered that welding not only reduces the strength of the joint—measurements show it to be only 80% of its pre-welded strength—but also results in a wide heat-affected zone and high energy throughout the weld, easily leading to localized collapse of the flame tube. This, in turn, affects the extension of the ignition nozzle. Significant localized collapse causes the ignition nozzle to extend excessively beyond the flame tube, directly bearing the high-temperature combustion gases during combustion chamber operation, resulting in ablation and affecting the engine's ignition system, thus causing safety issues. In a comparative solution, to address the problem of localized flame tube collapse, a shim is added at the assembly point of the ignition nozzle and the combustion chamber casing after collapse. This requires repeated manual disassembly and measurement to select a shim of appropriate thickness, raising the ignition nozzle and reducing its extension beyond the flame tube, ultimately restoring it to its pre-collapse position. This operation significantly increases labor and time costs, severely impacting the normal operation of the engine. In addition, the floating mounting devices in the comparative schemes are mostly assembled by welding to form a space to confine the floating part within the space. If the floating part is damaged, disassembly and repair are very difficult, and the entire mounting device needs to be replaced.

[0049] Based on the above considerations, the inventors, after in-depth research, designed an installation structure. By integrally machining the outer shell and the outer ring of the flame tube, the installation structure is placed on the outer ring of the flame tube. Compared with welding, this method not only ensures that the strength is not weakened but also prevents local collapse of the outer ring of the flame tube, guaranteeing the insertion depth of the ignition nozzle into the outer ring of the flame tube. This eliminates the need for manual restoration of the insertion depth, saving labor and time costs and ensuring the safe and reliable operation of the engine. Furthermore, by incorporating a positioning ring with a variable notch size that cooperates with the outer shell to limit the bushing, the bushing can move freely within the second receiving space, causing the ignition nozzle to move along with it. This prevents the ignition nozzle from colliding with the outer ring of the flame tube due to uneven temperature and vibration loads between the combustion chamber casing and the outer ring of the flame tube, thus avoiding damage. The positioning ring also makes disassembly and assembly very convenient. Compared with welding to create the bushing's movement space, this method facilitates bushing maintenance and replacement, extends service life, and saves costs.

[0050] Although the installation structure disclosed in the embodiments of this application is applicable to the combustion chamber of an aircraft engine to achieve the effect of protecting the ignition nozzle, it is not limited thereto. As long as it is for the purpose of protecting the igniter, the installation structure disclosed in the embodiments of this application can be applied.

[0051] like Figure 1 As shown, the aero-engine combustion chamber 1000 mainly consists of components such as the outer ring 40 of the flame tube, the fuel nozzle 100, the head transition section assembly 70, the inner and outer caps 60, the inner ring 50 of the flame tube, the outer casing 30 of the combustion chamber, the pre-diffuser 90, the main vortex generator 80, the ignition nozzle 20, and the nozzle mounting structure 10. The ignition nozzle 20 is directly fixed to the outer casing 30 of the combustion chamber by bolts, and its tip extends into the outer ring 40 of the flame tube for ignition. During the entire combustion chamber operation, the high-temperature gases generated by the intense combustion of fuel and exhaust gases occur inside the flame tube. The flame tube plays a role in organizing combustion and withstands the repeated action of the high-temperature gases. High temperatures and thermal deformation put the flame tube under severe stress. Under these conditions, the assembly position of the ignition nozzle 20 leads to a mismatch between the relatively low-temperature outer casing 30 of the combustion chamber and the high-temperature outer ring 40 of the flame tube. Simultaneously, the entire combustion chamber 1000 also bears vibration loads during combustion. The ignition nozzle 20 is affected by these two loads, resulting in a certain displacement in the radial and axial directions of the flame tube. To ensure that the ignition nozzle 20 does not collide with the flame tube, the displacement is absorbed by the ignition nozzle mounting structure, as detailed below:

[0052] refer to Figures 1 to 6 As shown, in one embodiment, the mounting structure 10 for mounting the ignition nozzle 20 to the outer ring 40 of the flame tube may specifically include a bushing 1, a positioning ring 2, and a housing 3. The bushing 1 includes an extension 11 and a mounting portion 12. The extension 11 extends outward from the mounting portion 12, and the mounting portion 12 has a through hole 13 for passing through the mounting nozzle 20. The positioning ring 2 includes a first end 21 and a second end 22, which define a notch 23 in the positioning ring 2. The size of the notch 23 is variable, so that the surrounding size of the positioning ring 2 is variable. The outer casing 3 is integrally formed with the outer ring 40 of the flame tube and includes a first part 31 and a second part 32 connected axially. The second part 32 includes a first ring 321, a second ring 322, and a connecting wall 323 connecting the outer sides of the first ring 321 and the second ring 322. The first ring 321 is formed by extending the first part 31 outward, and the second ring 322 is formed by extending the connecting wall 323 inward. The first part 31 provides a first receiving space 301 for accommodating the ignition nozzle 20. The second part 32 provides a second receiving space 302 formed by the first ring 321, the second ring 322, and the connecting wall 323 for accommodating the bushing 1 and the positioning ring 2. The positioning ring 2 is sleeved on the mounting part 12 of the bushing 1. The second ring 322 and the extension 11 of the bushing 1 are located on both axial sides of the positioning ring 2. The second ring 322 limits the positioning ring 2 and the extension 11 of the bushing 1 within the second receiving space 302.

[0053] Here, "shoulder 1" refers to a structure that directly contacts the ignition nozzle 20 and can cause the ignition nozzle 20 to shift to compensate for uncoordinated deformation. The mounting part 12 of bushing 1 can be either cylindrical or... Figure 6 As shown, the upper side of the mounting portion 12 is flared, which makes it easier to assemble with the ignition nozzle 20. In some embodiments, the bushing 1 is a floating gasket.

[0054] The term "positioning ring 2" here refers to a structure that cooperates with the housing 3 to confine the bushing 1 within the second receiving space 302. In some embodiments, the positioning ring 2 is a retaining ring.

[0055] The "enclosing dimension of positioning ring 2" here refers to the outer edge and inner edge of positioning ring 2, and the enclosing dimension is the size of the area enclosed by the outer and inner edges. Positioning ring 2 has a certain degree of elasticity; as the notch size changes, the enclosing dimension also changes. For example... Figure 3 As shown, the first end 21 and the second end 21 are close to each other, the notch 23 becomes smaller, and the surrounding size of the positioning ring 2 also becomes smaller.

[0056] Here, "outer shell 3" refers to the structure that supports the bushing 1 and the positioning ring 2, and enables the mounting structure 10 to be assembled and connected with the outer ring 40 of the flame tube, such as... Figure 1 As shown, the outer shell 3 is integrally formed with the outer ring of the flame tube, so that the mounting structure is located on the outer ring 40 of the flame tube, and then the ignition nozzle 20 is assembled to the outer ring 40 of the flame tube.

[0057] The term "Part 31" here refers to a structure integrally formed with the outer ring of the flame tube, connecting the first ring of Part 2 to the outer ring of the flame tube, for example... Figure 3 The cylindrical structure shown.

[0058] The meanings of "first ring 321, second ring 322, connecting wall 323" here are as follows: first ring 321 and second ring 322 refer to annular shell walls with through-holes on the inside, which facilitates the passage of parts and limits the movement of relevant parts; connecting wall 323 refers to the shell wall that connects the first ring 321 and the second ring 322, and together with the first ring 321 and the second ring 322, it forms the second receiving space 302.

[0059] The beneficial effects of this embodiment are as follows: by integrally machining the outer shell and the outer ring of the flame tube, the mounting structure is placed on the outer ring of the flame tube. Compared with welding, this not only ensures that the strength is not weakened, but also prevents the outer ring of the flame tube from collapsing locally. This guarantees the insertion depth of the ignition nozzle into the outer ring of the flame tube, eliminating the need for manual restoration and saving labor and time costs, thus ensuring the safe and reliable operation of the engine. Furthermore, by using a positioning ring with a variable notch size to cooperate with the outer shell to limit the bushing, the bushing can move freely within the second receiving space, causing the ignition nozzle to move along with it. This prevents the ignition nozzle from colliding with the outer ring of the flame tube due to uneven temperature and vibration loads between the combustion chamber casing and the outer ring of the flame tube, thus avoiding damage. The positioning ring also makes disassembly and assembly very convenient. Compared with welding to create the bushing's moving space, this facilitates bushing maintenance and replacement, extends service life, and saves costs.

[0060] refer to Figures 2 to 6 As shown, in some embodiments, the mounting structure 10 may have the following specific structure: the extension 11 abuts against the positioning ring 2 to form a first annular band 41, and the second ring 322 abuts against the positioning ring 2 to form a second annular band 42, with the first annular band 41 located inside the second annular band 42. Specifically, the outer edge dimension of the extension 11 is less than or equal to the inner edge dimension of the second ring 322. In the assembled state, the outer edge dimension of the positioning ring 2 is greater than the inner edge dimension of the second ring 322, and the positioning ring 2 abuts against both the extension 11 and the second ring 322 simultaneously. The advantage of this arrangement is that it ensures that the bushing 1 can be easily inserted into the second receiving space 302 from the inside of the second ring 322, facilitating the assembly of the mounting structure 10.

[0061] refer to Figure 2 Combination Figure 5 , Figure 6 As shown, in some embodiments, the mounting structure 10 may have a 0.2mm gap between the wall of the through hole 13 of the mounting portion 12 of the bushing 1 and the ignition nozzle 20. This arrangement ensures reliable assembly of the ignition nozzle and the bushing, prevents misalignment, and improves assembly convenience.

[0062] refer to Figure 5 As shown, in some embodiments, the bushing 1 may have a plurality of cooling holes 5 circumferentially provided in the extension 11. The advantage of this arrangement is that the cooling holes 5 can cool the ignition nozzle 20 through the cooling air from the annular cavity between the outer ring 40 of the flame tube and the outer casing 30 of the combustion chamber, thereby achieving a cooling effect to a certain extent, preventing the ignition nozzle 20 from being damaged due to excessive temperature, and extending the service life of the ignition nozzle 20.

[0063] refer to Figure 2 Combination Figure 3 , Figure 6 As shown, in some examples, the specific structure of the mounting structure 10 can be such that the outer edge 111 of the extension 11 of the bushing 1 has a gap of 1-2 mm with the connecting wall 323. The advantage of this arrangement is that the gap between the bushing 1 and the connecting wall 323 ensures that the bushing 1 will not get stuck in the second receiving space 302, allowing the bushing 1 to move freely and drive the ignition nozzle 20 to move together to address the problem of uneven temperature and vibration loads between the combustion chamber casing and the outer ring of the flame tube.

[0064] In some embodiments, such as Figure 2 Combination Figure 3 As shown, there is a 0.1mm gap between the positioning ring 2 and the second ring 322 to prevent the bushing 1 from getting stuck in the axial direction and to ensure that the bushing 1 can move freely in the second receiving space 302. This can not only cope with the temperature load and vibration load of the combustion chamber 30 and the outer ring 40 of the flame tube, but also will not affect the insertion amount of the ignition nozzle 20.

[0065] refer to Figure 4 As shown, in some embodiments, the positioning ring 2 may have a clamping portion 24 at the first end 21 and the second end 22. Here, "clamping portion 24" refers to a structure that facilitates tool adjustment of the size of the notch 23 between the first end 21 and the second end 22. This design increases the ease of adjusting the size of the positioning ring 2 and improves assembly and disassembly efficiency.

[0066] Continue to refer to Figure 4 As shown, in some embodiments, the specific structure of the clamping part 24 may include holes 241 formed at the first end 21 and the second end 22. Specifically, as... Figure 3 Combination Figure 4 As shown, a needle-nose pliers tool can be used to clamp the hole 241 and reduce the notch 23 so that the surrounding size of the positioning ring 2 is smaller than the inner edge 3221 of the second ring 322, allowing the positioning ring 2 to pass smoothly through the second ring 322 and be directly placed into the second receiving space 302. Then, the needle-nose pliers tool is released, allowing the positioning ring 2 to be in a free state and restore its surrounding size, cooperating with the second ring 322 to limit the bushing 1.

[0067] refer to Figure 5 Combination Figure 6 As shown, in some embodiments, the bushing 1 may have a wear-resistant coating applied to the upper and lower surfaces of the extension 11. Specifically, as... Figures 2 to 6As shown, since the bushing 1 is assembled between the positioning ring 2 and the first ring 321 and can move freely in the second receiving space 30, a chrome-plated coating is added to the mating surface of the bushing 1, the positioning ring 2, and the first ring 321 to form a wear-resistant layer, so as to avoid damage to the bushing 1 due to relative friction. After working for a certain period of time, the positioning ring 2 can be disassembled with tools to replace the bushing 1, thus extending the service life of the installation structure.

[0068] refer to Figures 1 to 6 As shown, in one embodiment, the specific structure of the outer ring 40 of the flame tube can include a body 401 and a housing 3 of the mounting structure 10 as described above. The body 401 surrounds and forms a space 402. The housing 3 includes a first part 31 and a second part 32 connected axially. The first part 31 provides a first receiving space 301, and the second part 32 provides a second receiving space 302. The first receiving space 301, the second receiving space 302, and the space 402 are directly connected. The advantage of this arrangement is that by integrally machining the housing with the outer ring of the flame tube, the mounting structure is set on the outer ring of the flame tube. Compared with the welding method, this not only ensures that the strength is not weakened, but also prevents the outer ring of the flame tube from collapsing locally. This ensures the insertion depth of the ignition nozzle into the outer ring of the flame tube without the need for manual restoration of the insertion depth, saving labor and time costs and ensuring the safe and reliable operation of the engine.

[0069] Continue to refer to Figures 1 to 6 As shown, in one embodiment, the combustion chamber 1000 may include an outer casing 30, a flame tube outer ring 40, an ignition nozzle 20, and the mounting structure 10 as described above. The ignition nozzle 20 is fixedly connected to the outer casing 30 by a fastener. The outer shell 3 of the mounting structure 10 is integrally formed with the flame tube outer ring 40. The ignition nozzle 20 is installed in the bushing 1 of the mounting structure 10, and the ignition end 200 of the ignition nozzle 20 extends into the inner side of the flame tube outer ring 40 for ignition. The beneficial effect of this configuration is that by assembling the ignition nozzle with the combustion chamber using the mounting structure, the problem of uneven temperature and vibration loads between the outer casing and the flame tube outer ring of the combustion chamber can be effectively addressed. At the same time, the integral machining replaces the welding connection method, which not only ensures the assembly strength but also avoids flame tube collapse, improves assembly reliability, and ensures the safe operation of the combustion chamber.

[0070] refer to Figures 1 to 7 As shown, in one embodiment, the mounting structure 10 described above is used. The inner edge 3221 of the second ring 322 of the mounting structure 10 constitutes the entrance to the second receiving space 302 of the mounting structure 10. The specific steps of the mounting method for installing the ignition nozzle 20 on the outer ring 40 of the flame tube may include:

[0071] S1. Insert the bushing 1 of the mounting structure 10 into the second receiving space 302 through the inlet.

[0072] S2. The positioning ring 2 of the mounting structure 10 is fitted onto the mounting part 12 of the bushing 1.

[0073] S3. Narrow the notch 23 of the positioning ring 2 and insert the positioning ring 2 into the second receiving space 302 through the inlet. Specifically, as mentioned above, needle-nose pliers can be used to clamp the hole 241 and narrow the notch 23 so that the surrounding size of the positioning ring 2 is smaller than the inner edge 3221 of the second ring 322, allowing the positioning ring 2 to pass smoothly through the second ring 322 and be directly inserted into the second receiving space 302.

[0074] S4. Restore the size of the notch 23, and the second ring 322 confines the positioning ring 2 and the bushing 1 within the second receiving space 302. Specifically, as described above, release the pointed pliers tool, allowing the positioning ring 2 to be in a free state and restore its surrounding size, cooperating with the second ring 322 to confine the bushing 1.

[0075] After the mounting structure 10 is assembled, the ignition nozzle 20 is inserted from the mounting part 12 of the bushing 1 into the first receiving space 301 of the first part 31 of the outer shell 3 and into the space 402 formed by the outer ring 40 of the flame tube.

[0076] The advantage of this design is that the positioning ring can be easily disassembled and installed, facilitating the maintenance and replacement of the bushing, extending its service life, and saving costs.

[0077] In summary, the beneficial effects of the flame tube outer ring, combustion chamber, installation structure, and method described in the above embodiments include, but are not limited to, one or a combination of the following:

[0078] 1. The mounting structure of this application integrates the outer shell and the outer ring of the flame tube, placing the mounting structure on the outer ring of the flame tube. Compared to welding, this method not only ensures that the strength is not weakened but also prevents local collapse of the outer ring of the flame tube, guaranteeing the insertion depth of the ignition nozzle into the outer ring of the flame tube. This eliminates the need for manual restoration, saving labor and time costs and ensuring the safe and reliable operation of the engine. Furthermore, by using a positioning ring with a variable notch size to cooperate with the outer shell and limit the bushing, the bushing can move freely within the second receiving space, causing the ignition nozzle to move along with it. This prevents damage to the ignition nozzle from collision with the outer ring of the flame tube due to uneven temperature and vibration loads between the combustion chamber casing and the outer ring of the flame tube. The positioning ring also makes disassembly and assembly very convenient. Compared to welding to create the bushing's movement space, this method facilitates bushing maintenance and replacement, extends service life, and saves costs.

[0079] 2. The outer ring of the flame tube in this application is integrated with the outer shell of the flame tube by setting the mounting structure on the outer ring of the flame tube. Compared with the welding method, this not only ensures that the strength is not weakened, but also prevents the outer ring of the flame tube from collapsing locally. This ensures the insertion depth of the ignition nozzle into the outer ring of the flame tube, eliminating the need for manual restoration of the insertion depth, saving labor and time costs, and ensuring the safe and reliable operation of the engine.

[0080] 3. The combustion chamber of this application assembles the ignition nozzle with the combustion chamber by setting an installation structure, which can effectively solve the problem of uneven temperature load and vibration load between the outer casing of the combustion chamber and the outer ring of the flame tube. At the same time, the integral machining replaces the welding connection method, which not only ensures the assembly strength, but also avoids the collapse of the flame tube, improves the assembly reliability, and ensures the safe operation of the combustion chamber.

[0081] 4. The installation method of this application allows for easy disassembly and assembly of the positioning ring, facilitating the maintenance and replacement of the bushing, extending its service life, and saving costs.

[0082] While the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the invention. Any variations and modifications can be made by those skilled in the art without departing from the spirit and scope of the invention. Therefore, any modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention, without departing from the scope of the invention, fall within the protection scope defined by the claims of the present invention.

Claims

1. An installation structure for mounting an ignition nozzle to the outer ring of a flame tube, characterized in that, include: A bushing includes an extension and a mounting portion, the extension being formed by the mounting portion extending outwardly, the mounting portion having a through hole for mounting the ignition nozzle; A positioning ring includes a first end and a second end, the first end and the second end defining a notch in the positioning ring, the size of the notch being variable so that the enclosing size of the positioning ring is variable; The outer casing, integrally formed with the outer ring of the flame tube, includes a first part and a second part connected axially. The second part includes a first ring, a second ring, and a connecting wall connecting the outer sides of the first ring and the second ring. The first ring extends outward from the first part, and the second ring extends inward from the connecting wall. The first part provides a first receiving space for accommodating the ignition nozzle, and the second part provides a second receiving space formed by the first ring, the second ring, and the connecting wall for accommodating the bushing and the positioning ring. The positioning ring is sleeved on the mounting portion of the bushing, and the second ring and the extension portion of the bushing are located on both axial sides of the positioning ring. The second ring limits the positioning ring and the extension portion of the bushing within the second accommodating space.

2. The installation structure according to claim 1, characterized in that, The extension abuts against the positioning ring to form a first annular band, and the second ring abuts against the positioning ring to form a second annular band, with the first annular band located inside the second annular band.

3. The installation structure according to claim 1, characterized in that, There is a 0.2mm gap between the wall of the through hole of the mounting part of the bushing and the ignition nozzle.

4. The installation structure according to claim 1, characterized in that, The bushing extension has a plurality of cooling holes in the circumferential direction.

5. The installation structure according to claim 1, characterized in that, The outer edge of the extension of the bushing has a gap of 1-2 mm with the connecting wall.

6. The installation structure according to claim 1, characterized in that, The first and second ends of the positioning ring have clamping portions.

7. The installation structure according to claim 6, characterized in that, The clamping part includes holes formed at the first end and the second end.

8. The installation structure according to claim 1, characterized in that, The upper and lower surfaces of the extension of the bushing are coated with a wear-resistant coating.

9. An outer ring for a flame tube, characterized in that, The device includes a body and a housing with an installation structure as described in any one of claims 1-8. The body surrounds and forms a space. The housing includes a first part and a second part that are axially connected. The first part provides a first receiving space, and the second part provides a second receiving space. The first receiving space, the second receiving space, and the space are directly connected.

10. A combustion chamber, characterized in that, The device includes an outer casing, a flame tube outer ring, an ignition nozzle, and a mounting structure as described in any one of claims 1-8. The ignition nozzle is fixedly connected to the outer casing via a fastener. The outer shell of the mounting structure is integrally formed with the flame tube outer ring. The ignition nozzle is installed in the bushing of the mounting structure. The ignition end of the ignition nozzle extends into the radially inner side of the flame tube outer ring for ignition.

11. An installation method for installing an ignition nozzle on the outer ring of a flame tube, characterized in that, The mounting structure as described in any one of claims 1-8, wherein the inner edge of the second ring of the mounting structure constitutes the entrance to the second receiving space of the mounting structure, includes: S1. Insert the bushing of the mounting structure into the second receiving space through the inlet; S2. The positioning ring of the mounting structure is fitted onto the mounting part of the bushing; S3. Narrow the notch of the positioning ring and insert the positioning ring into the second receiving space through the inlet; S4. Restore the size of the notch, and the second ring confines the positioning ring and the bushing within the second accommodating space.

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