Fuel manifold and aeroengine

Abstract

The present invention discloses a fuel manifold and an aeroengine. The fuel manifold includes a first branch pipe, a second branch pipe and an assembly joint; the assembly joint is used to connect adjacent pipe bodies at a preset circumferential position; the first branch pipe successively includes a first pipe section, a second pipe section and a third pipe section; a preset angle is formed between the first pipe section and the second pipe section and they are connected to a tee joint at the preset angle, the third pipe section is configured to extend in a preset direction to match the installation position of a fuel nozzle, the structure of the second branch pipe matches that of the first branch pipe, and the length of the third pipe section of the second branch pipe is greater than that of the third pipe section of the first branch pipe; connection structures for connecting with fuel nozzles are respectively arranged at the second ends of the first branch pipe and the second branch pipe, the connection structure includes a sealing head and an outer sleeve nut sleeved on the sealing head, the sealing head is provided with a limiting structure for axial limitation, the sealing head is provided with an elastic sealing structure, and the fuel inlet of the fuel nozzle is provided with a sealing structure for cooperating with the elastic sealing structure.

Description

Technical Field

[0001] The present invention relates to the technical field of aero-engines, and in particular, to a fuel manifold. In addition, the present invention also relates to an aero-engine including the above fuel manifold. Background Art

[0002] The fuel manifold of an aero-engine is an oil supply pipeline for the fuel nozzles of the combustion chamber, and is generally arranged in the head area of the combustion chamber. As the structure of the engine becomes more and more compact, the number of combustion chamber heads increases, the design space of the fuel manifold becomes smaller, and the design difficulty increases. The design difficulty of the fuel manifold is mainly reflected in the structural layout and the interface seal design.

[0003] In order to solve the problem of safe and reliable interface sealing in the existing fuel manifold design, a polytetrafluoroethylene hose design is generally adopted, as Figure 1 shown. The branch pipes and the three-way joints are made of stainless steel, and the three-way joints are connected by polytetrafluoroethylene hoses. The flexibility of the polytetrafluoroethylene hoses is used to improve the assembly performance of the manifold, so as to ensure the reliability of the interface seal.

[0004] Since the composition of the polytetrafluoroethylene hoses is relatively complex, the diameter of the hoses is relatively thick, which further leads to a large requirement for the structural layout space. Therefore, it is not suitable for engines with a compact structure and a small fuel manifold design space. For the fuel manifold designed with stainless steel pipes, due to the high hardness of the stainless steel pipes, the assembly performance in a narrow space is poor, and it is difficult to ensure the sealing reliability at the interface, and oil leakage at the interface usually occurs. Summary of the Invention

[0005] The present invention provides a fuel manifold and an aero-engine to solve the technical problems in the prior art that the installation space of the fuel manifold of medium and small engines is small, resulting in poor assembly performance and sealing performance of the stainless steel pipes.

[0006] A fuel manifold, the fuel manifold includes a plurality of pipe bodies and a tee joint. Adjacent pipe bodies are sequentially connected to form a closed-loop main pipe. The fuel manifold further includes a first branch pipe, a second branch pipe, and an assembly joint. The tee joint is configured to be disposed on the pipe body and for connecting the first end of the first branch pipe or the first end of the second branch pipe or the inlet pipe. The assembly joint is configured to connect adjacent pipe bodies at a preset circumferential position. The first branch pipe sequentially includes a first pipe section, a second pipe section, and a third pipe section. A preset angle is formed between the first pipe section and the second pipe section and they are connected to the tee joint at the preset angle to avoid interfering pipelines and / or mounting seats in the installation environment. The third pipe section is configured to extend in a preset direction to match the circumferential installation position of the fuel nozzle. The structure of the second branch pipe matches the structure of the first branch pipe, and the length of the third pipe section of the second branch pipe is greater than the length of the third pipe section of the first branch pipe. Connection structures for connecting with the fuel nozzle are respectively provided at the second ends of the first branch pipe and the second branch pipe. An external thread is provided on the outer wall of the fuel inlet of the fuel nozzle. The connection structure includes a sealing head respectively provided at the end of the second end of the first branch pipe and the end of the second end of the second branch pipe, and an outer sleeve nut sleeved on the sealing head and configured to be threadedly connected with the external thread of the fuel inlet of the fuel nozzle. The sealing head is provided with a limiting structure for axially limiting the outer sleeve nut. An elastic sealing structure is provided at the end of the sealing head. A sealing structure for cooperating with the elastic sealing structure is provided at the fuel inlet of the fuel nozzle.

[0007] As a further improvement of the above technical solution, the limiting structure includes a first limiting protrusion provided on the side wall of the sealing head, a first limiting groove opened on the inner wall of the outer sleeve nut, and an annular limiting member sleeved on the sealing head. The outer diameter of the first limiting protrusion is smaller than the inner diameter of the outer sleeve nut. The inner diameter of the annular limiting member is smaller than the outer diameter of the first limiting protrusion. The outer diameter of the annular limiting member matches the radial dimension of the first limiting groove.

[0008] As a further improvement of the above technical solution, the cross-section of the annular limiting member is circular, the first limiting groove is an arc-shaped groove, and a fillet is provided between the first limiting protrusion and the side wall of the sealing head.

[0009] As a further improvement of the above technical solution, the sealing structure includes a tapered opening opened at the connection end of the fuel nozzle. The inner diameter of the outer end of the tapered opening is greater than the inner diameter of the inner end. The side wall of the sealing end of the sealing head is tapered and provided with a spherical structure. The taper of the side wall of the sealing end matches the taper of the tapered opening. The depth of the tapered opening is greater than the axial dimension of the sealing end of the sealing head.

[0010] As a further improvement of the above technical solution, the elastic sealing structure includes a sealing gasket, the shape of the sealing gasket matches that of the conical opening, the sealing gasket is sleeved on the sealing end of the sealing head, or the sealing gasket is coated on the sealing end of the sealing head.

[0011] As a further improvement of the above technical solution, a second limiting protrusion is provided on the inner wall of the sealing gasket, and a second limiting groove for cooperating with the second limiting protrusion is provided on the side wall of the sealing head. Alternatively, a second limiting groove is provided on the inner wall of the sealing gasket, and a second limiting protrusion for cooperating with the second limiting groove is provided on the side wall of the sealing head.

[0012] As a further improvement of the above technical solution, a force application structure is provided on the outer wall of the outer sleeve nut, and the force application structure includes knurling and / or an external hexagonal structure.

[0013] As a further improvement of the above technical solution, the structure of the assembly joint matches the connection structure.

[0014] As a further improvement of the above technical solution, the outer end of the first pipe section is used to connect to the tee joint, and the connection structure is provided at the outer end of the third pipe section; an obtuse angle is formed between the first pipe section and the second pipe section. The interface corresponding to the first pipe section on the tee joint for connecting the first branch pipe or the second branch pipe is arranged to incline at a preset angle towards the center direction of the fuel manifold, so that the first pipe section is installed on the tee joint in an inclined state and the second pipe section is located or tends to be in the axial direction.

[0015] According to another aspect of the present invention, an aeroengine is further provided, which includes the above fuel manifold.

[0016] The present invention has the following beneficial effects:

[0017] This fuel manifold can be formed by setting the main pipe as multiple pipe bodies and connecting them through assembly joints. After the branch pipes on each pipe body are installed and connected, the pipe bodies can be connected through the assembly joints to form this fuel manifold, effectively reducing the assembly difficulty of the fuel manifold and enabling a more compact structural design and more reasonable space utilization. The first branch pipe and the second branch pipe are both constructed in an approximately U-shaped structure. Through the first pipe section and the second pipe section, the pipelines that are prone to interference in the axial extension space of the fuel manifold in the installation environment are avoided, leaving more space for the T45 probe leads at the same axial position. The T45 probe leads can be wound around the outside of the branch pipes, greatly reducing the lead-winding difficulty and improving the engine's assemblability. It extends from the third pipe section towards the circumferential installation position of the fuel nozzle, and the lengths of the third pipe sections of the first branch pipe and the second branch pipe are different. Therefore, the first branch pipe or the second branch pipe can be selected according to the interference structures such as other mounting seats in the installation environment. The structure is more compact and reasonable. At the same time, the structure of this branch pipe extends the length of the branch pipe, effectively improving the flexibility of the branch pipe made of stainless steel material, and further improving the assemblability of the fuel manifold. The second ends of the first branch pipe and the second branch pipe are respectively provided with connection structures for connecting with the fuel nozzle. The connection structure includes a sealing head arranged at the end of the second end of the branch pipe and an outer sleeve nut sleeved outside the sealing head. The sealing head is provided with a limiting structure for axially limiting the outer sleeve nut. When the outer sleeve nut is threadedly connected with the fuel nozzle, the axial position of the outer sleeve nut is restricted. Then, when the outer sleeve nut is tightened, the sealing head is matched with the sealing structure, and the elastic sealing structure is closely matched with the sealing structure to achieve sealing. The sealing effect is good, reducing the possibility of oil leakage. The limiting structure only axially limits the locking direction of the outer sleeve nut, and the reverse retraction is not restricted. Therefore, the interference with the fuel inlet of the fuel nozzle is avoided, the assemblability of the fuel manifold is improved, and the maintenance and replacement of parts are more convenient.

[0018] In addition to the purposes, features, and advantages described above, the present invention has other purposes, features, and advantages. The following will refer to the drawings for a more detailed description of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings forming a part of this application are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0020] Figure 1 is a schematic structural diagram of a prior art polytetrafluoroethylene fuel manifold;

[0021] Figure 2 is a schematic structural diagram of the fuel manifold according to a preferred embodiment of the present invention;

[0022] Figure 3 is a schematic assembly structure diagram of the first branch pipe and the second branch pipe according to a preferred embodiment of the present invention;

[0023] Figure 4 It is a schematic diagram of the connection structure of the preferred embodiment of the present invention;

[0024] Figure 5 It is a schematic diagram of the assembly joint structure of the preferred embodiment of the present invention.

[0025] Legend description:

[0026] 10. Pipe body; 11. First pipe head; 20. Fuel nozzle; 201. Conical opening; 202. External thread; 30. First branch pipe; 31. Outer sleeve nut; 311. First limit groove; 312. Internal thread; 32. Elastic sealing structure; 33. Annular limit member; 34. Sealing head; 341. Second limit groove; 342. First limit protrusion; 343. Sealing surface; 40. Three-way joint; 51. Second pipe head; 52. Sealing joint; 60. Fuel inlet pipe; 70. Second branch pipe. Detailed implementation manners

[0027] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings. However, the present invention can be implemented in many different ways defined and covered by the following.

[0028] Figure 2 It is a schematic diagram of the structure of the fuel manifold of the preferred embodiment of the present invention; Figure 3 It is a schematic diagram of the assembly structure of the first branch pipe and the second branch pipe of the preferred embodiment of the present invention; Figure 4 It is a schematic diagram of the connection structure of the preferred embodiment of the present invention; Figure 5 It is a schematic diagram of the assembly joint structure of the preferred embodiment of the present invention.

[0029] Such as Figures 2 to 5As shown in the figure, the fuel manifold of this embodiment includes a plurality of pipe bodies 10 and a tee joint 40. Adjacent pipe bodies 10 are sequentially connected to form a closed-loop main pipe. The fuel manifold further includes a first branch pipe 30, a second branch pipe 70, and an assembly joint. The tee joint 40 is used to be arranged on the pipe body 10 and for connecting the first end of the first branch pipe 30 or the first end of the second branch pipe 70 or the inlet pipe 60. The assembly joint is used to connect adjacent pipe bodies 10 at a preset circumferential position. The first branch pipe 30 sequentially includes a first pipe section, a second pipe section, and a third pipe section. A preset angle is formed between the first pipe section and the second pipe section and they are connected to the tee joint 40 at the preset angle to avoid interfering pipelines and / or mounting seats in the installation environment. The third pipe section is configured to extend in a preset direction to match the circumferential installation position of the fuel nozzle 20. The structure of the second branch pipe 70 matches the structure of the first branch pipe 30, and the length of the third pipe section of the second branch pipe 70 is greater than the length of the third pipe section of the first branch pipe 30. Connection structures for connecting with the fuel nozzle 20 are respectively arranged at the second ends of the first branch pipe 30 and the second branch pipe 70. An external thread 202 is arranged on the outer wall of the oil inlet of the fuel nozzle 20. The connection structures respectively include a sealing head 34 arranged at the end of the second end of the first branch pipe 30 and the second end of the second branch pipe 70, and an outer sleeve nut 31 sleeved on the sealing head 34 and used for threadedly connecting with the external thread 202 of the oil inlet of the fuel nozzle 20. The sealing head 34 is provided with a limiting structure for axially limiting the outer sleeve nut 31. An elastic sealing structure 32 is arranged at the end of the sealing head 34. A sealing structure for cooperating with the elastic sealing structure 32 is arranged at the oil inlet of the fuel nozzle 20.

[0030] Among them, the internal thread 312 of the outer sleeve nut 31 matches the external thread 202 of the oil inlet of the fuel nozzle 20. The first interface and the second interface of the tee joint 40 are respectively connected to the pipe body 10. The third interface of the tee joint 40 is communicated with the pipe body 10, and its third interface is used to connect the first end of the first branch pipe 30 or the first end of the second branch pipe 70 or the inlet pipe 60. Specifically, at least one tee joint 40 is connected to the inlet pipe 60 to introduce fuel into the closed-loop main pipe and output it to the fuel nozzle 20 through each branch pipe. The first branch pipe and the second branch pipe are preferably connected to the pipe body by welding.

[0031] It can be understood that by setting the main pipe as multiple pipe bodies 10 and connecting them through assembly joints, the fuel manifold can be formed by connecting the pipe bodies 10 through the assembly joints after the branch pipes on each pipe body 10 are installed, effectively reducing the assembly difficulty of the fuel manifold and enabling a more compact structural design and more reasonable space utilization; both the first branch pipe 30 and the second branch pipe 70 are constructed in an approximately U-shaped structure. The first pipe section and the second pipe section avoid the pipelines that are prone to interference in the axial extension space of the fuel manifold in the installation environment, reserve more space for the T45 probe leads at the same axial position, and enable the T45 probe leads to wind around from the outside of the branch pipe, greatly reducing the lead wiring difficulty and improving the engine assembly performance; furthermore, with the extension of the third pipe section towards the circumferential installation position of the fuel nozzle 20, the lengths of the third pipe section of the first branch pipe 30 and the third pipe section of the second branch pipe 70 are different, and thus the first branch pipe 30 or the second branch pipe 70 can be selected according to the interference structures such as other mounting seats in the installation environment. The structure is more compact and reasonable. At the same time, the structure of this branch pipe extends the length of the branch pipe, effectively improving the flexibility of the branch pipe made of stainless steel material, and further improving the assembly performance of the fuel manifold; connection structures for connecting with the fuel nozzle 20 are respectively arranged at the second ends of the first branch pipe 30 and the second branch pipe 70. The connection structure includes a sealing head 34 arranged at the end of the second end of the branch pipe and an outer sleeve nut 31 sleeved outside the sealing head 34. The sealing head 34 is provided with a limiting structure for axially limiting the outer sleeve nut 31. When the outer sleeve nut 31 is threadedly connected with the fuel nozzle 20, the axial position of the outer sleeve nut 31 is restricted. Furthermore, when the outer sleeve nut 31 is tightened to make the sealing head 34 cooperate with the sealing structure, the elastic sealing structure 32 closely cooperates with the sealing structure to achieve sealing. The sealing effect is good, reducing the possibility of oil leakage. The limiting structure only axially limits the locking direction of the outer sleeve nut 31, and the reverse retraction is not restricted, thus avoiding interference with the oil inlet of the fuel nozzle 20, improving the assembly performance of the fuel manifold, and making the maintenance and replacement of parts more convenient.

[0032] Among them, the main pipe includes at least two pipe bodies 10. In this embodiment, two are taken as an example. A tee joint 40 at the middle position of one pipe body 10 is used to connect with the fuel inlet pipe 60; it should be understood that the tee joints 40 for connecting the fuel inlet pipe 60 and the tee joints 40 for connecting the branch pipes respectively adopt different specifications of matching tee joints 40;

[0033] In some embodiments, the outer end of the first pipe section is used to connect to the tee joint 40, and a connection structure is provided at the outer end of the third pipe section; an obtuse angle is formed between the first pipe section and the second pipe section. The interface of the corresponding first pipe section on the tee joint 40 for connecting the first branch pipe 30 or the second branch pipe 70 is arranged to incline at a preset angle towards the center of the fuel manifold, so that the first pipe section is installed on the tee joint 40 in an inclined state and the second pipe section is located or tends to be in the axial direction. That is, both the first branch pipe 30 and the second branch pipe 70 are configured in an approximately U-shaped structure. After the first pipe section is connected to the tee joint 40, it extends downward by a certain length in the direction of the center of the fuel manifold, then extends downward along the axis by the second pipe section, and finally the third pipe section gradually extends in the circumferential position of the fuel nozzle in the horizontal direction, so that there is a certain space below the main pipe, which is convenient for leading the T45 probe wire, enabling it to wind around the outside of the branch pipe and reducing the difficulty of wire leading.

[0034] In some embodiments, the limiting structure includes a first limiting protrusion 342 provided on the side wall of the sealing head 34, a first limiting groove 311 opened on the inner wall of the outer sleeve nut 31, and an annular limiting member 33 sleeved on the sealing head 34. The outer diameter of the first limiting protrusion 342 is smaller than the inner diameter of the outer sleeve nut 31, the inner diameter of the annular limiting member 33 is smaller than the outer diameter of the first limiting protrusion 342, and the outer diameter of the annular limiting member 33 matches the radial dimension of the first limiting groove 311. Among them, the annular limiting member 33 has a certain flexibility. By setting the annular limiting member 33 to be embedded in the first limiting groove 311 on the inner wall of the outer sleeve nut 31, and then the annular limiting member 33 cooperates with the outer wall of the sealing head 34 and abuts against the first limiting protrusion 342 to achieve axial limiting. After the outer sleeve nut 31 is retracted to the position of the branch pipe body outside the sealing head 34, the elastic sealing structure 32 can be exposed, so as to maintain and replace the elastic sealing structure 32. The operation is simple, while ensuring the sealing performance and assembly performance, the overall number of components is small, the structure is concise, and the disassembly and assembly are convenient. Further, the cross-section of the annular limiting member 33 is set to be circular, the first limiting groove 311 is an arc-shaped groove, a fillet is provided between the first limiting protrusion 342 and the side wall of the sealing head 34, and the annular limiting member 33 can be made of steel wire, which is convenient to be embedded in the first limiting groove 311 and fits tightly, and at the same time can be in close contact with the first limiting protrusion 342 to ensure the axial limiting effect. During the axial retreat movement of the outer sleeve nut 31 after it is separated from the fuel nozzle 20, the contact surface between it and the outer wall of the sealing head 34 is small, the frictional resistance is small, and the movement of the outer sleeve nut 31 is smoother and the operation is convenient.

[0035] In some embodiments, the sealing structure includes a conical opening 201 formed at the connecting end of the fuel nozzle 20, and the inner diameter of the outer end of the conical opening 201 is greater than that of the inner end; the side wall of the sealing end of the sealing head 34 is tapered and a spherical surface is provided as the sealing surface 343. The taper of the side wall of the sealing end matches the taper of the conical opening 201, preferably 24°, which has good assembly and sealing performance; the depth of the conical opening 201 is greater than the axial dimension of the sealing end of the sealing head 34 to ensure sufficient mating surfaces; both the sealing structure and the sealing head 34 are designed to be conical. When docking, the sealing end of the sealing head 34 can be better embedded into the fuel inlet of the fuel nozzle 20, so that the elastic sealing structure 32 gradually adheres to the inner wall of the conical opening 201 and is gradually pressed, ensuring the sealing performance; further, the elastic sealing structure 32 includes a sealing gasket, and the sealing gasket matches the shape of the conical opening 201. The sealing gasket is sleeved on the sealing end of the sealing head 34, and the sealing gasket sleeved on the side wall of the sealing end cooperates with the inner wall of the conical opening 201; in some embodiments, it can also be that the sealing gasket is coated on the sealing end of the sealing head 34; wherein, the sealing gasket material is T2M or N6-M. The thickness of the sealing gasket in this embodiment is 0.15 mm. In other embodiments, a sealing gasket with a thickness of 0.3 mm or more is used according to the specifications of the sealing head 34, and the material is selected according to specific circumstances.

[0036] Further, a second limiting protrusion is provided on the inner wall of the sealing gasket, and a second limiting groove 341 for cooperating with the second limiting protrusion is provided on the side wall of the sealing head 34. By respectively providing the second limiting protrusion and the second limiting groove 341 on the inner wall of the sealing gasket and the side wall of the sealing strip, the sealing gasket is axially limited and fixed after being sleeved on the sealing head 34. After unlocking by the outer sleeve nut 31 during sealing, it exits with the sealing head 34, and the components are not likely to fall off; in other embodiments, it can also be that a second limiting groove 341 is provided on the inner wall of the sealing gasket, and a second limiting protrusion for cooperating with the second limiting groove 341 is provided on the side wall of the sealing head 34, which has the same connection function.

[0037] In some embodiments, a force application structure is provided on the outer wall of the outer sleeve nut 31. The force application structure includes knurling and / or an external hexagonal structure for manual rotation or rotation with the aid of a wrench, etc.

[0038] In some embodiments, the structure of the assembly joint matches the connection structure. For example, a sealing head 34 and an outer sleeve nut 31 are provided at the first pipe head 11 of a pipe body 10, and a sealing joint 52 is provided at the second pipe head 51 of another pipe body 10. The sealing joint 52 has a conical opening 201 and an external thread 202. Its connection method and specific structure are implemented with reference to the connection structure and will not be elaborated too much.

[0039] On the other hand, a preferred embodiment of the present invention also provides an aeroengine, which is applied with the above fuel manifold.

[0040] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention.

[0041] In the description of the present invention, it should be noted that unless otherwise clearly specified and defined, the terms "installed", "connected", and "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0042] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention can have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A fuel main pipe, comprising a plurality of pipe bodies (10) and a three-way joint (40), wherein adjacent pipe bodies (10) are connected in sequence to form a closed-loop main pipe, characterized in that: The fuel main pipe also includes a first branch pipe (30), a second branch pipe (70) and an assembly joint; the three-way joint (40) is used to be arranged on the pipe body (10) and is used to connect the first end of the first branch pipe (30) or the first end of the second branch pipe (70) or the oil inlet pipe (60); the assembly joint is used to connect the adjacent pipe bodies (10) at a preset circumferential position; the first branch pipe (30) includes a first pipe section, a second pipe section and a third pipe section in sequence; a preset angle is constructed between the first pipe section and the second pipe section and the first pipe section is connected to the three-way joint (40) at a preset angle to avoid interference with pipelines and / or mounting seats in the installation environment; the third pipe section is structured to extend in a preset direction to match the circumferential installation position of the fuel nozzle (20); the structure of the second branch pipe (70) matches the structure of the first branch pipe (30), and the length of the third pipe section of the second branch pipe (70) is greater than The third pipe section of the first branch pipe (30) is longer than the third pipe section of the first branch pipe (30); the second ends of the first branch pipe (30) and the second branch pipe (70) are respectively provided with connection structures for connecting with the fuel nozzle (20); the outer wall of the fuel inlet of the fuel nozzle (20) is provided with an external thread (202); the connection structure comprises a sealing head (34) respectively provided at the second end portion of the first branch pipe (30) and the second end portion of the second branch pipe (70); and an outer sleeve nut (31) sleeved on the sealing head (34) and threadedly connected with the external thread (202) of the fuel inlet of the fuel nozzle (20); the sealing head (34) is provided with a limiting structure for axially limiting the outer sleeve nut (31); the end of the sealing head (34) is provided with an elastic sealing structure (32); and the fuel inlet of the fuel nozzle (20) is provided with a sealing structure for cooperating with the elastic sealing structure (32).

2. The fuel manifold according to claim 1, characterized in that: The limiting structure comprises a first limiting protrusion (342) arranged on the side wall of the sealing head (34), a first limiting groove (311) opened on the inner wall of the outer sleeve nut (31), and an annular limiting member (33) sleeved on the sealing head (34), wherein the outer diameter of the first limiting protrusion (342) is smaller than the inner diameter of the outer sleeve nut (31), the inner diameter of the annular limiting member (33) is smaller than the outer diameter of the first limiting protrusion (342), and the outer diameter of the annular limiting member (33) matches the radial dimension of the first limiting groove (311).

3. The fuel manifold according to claim 2, characterized in that: The cross section of the annular limiting member (33) is circular, the first limiting groove (311) is an arc-shaped groove, and a rounded corner is arranged between the first limiting protrusion (342) and the side wall of the sealing head (34).

4. The fuel manifold according to claim 1, characterized in that: The sealing structure comprises a tapered opening (201) opened at the connecting end of the fuel nozzle (20), the inner diameter of the outer end of the tapered opening (201) being larger than the inner diameter of the inner end; the side wall of the sealing end of the sealing head (34) is tapered and configured to have a spherical structure, the taper of the side wall of the sealing end matches the taper of the tapered opening (201), and the depth of the tapered opening (201) is larger than the axial dimension of the sealing end of the sealing head (34).

5. The fuel manifold according to claim 4, characterized in that: The elastic sealing structure (32) comprises a sealing gasket, the sealing gasket matches the shape of the tapered opening (201), the sealing gasket is sleeved on the sealing end of the sealing head (34), or the sealing gasket is covered on the sealing end of the sealing head (34).

6. The fuel manifold according to claim 5, characterized in that: The inner wall of the sealing gasket is provided with a second limiting protrusion, and the side wall of the sealing head (34) is provided with a second limiting groove (341) for cooperating with the second limiting protrusion, or the inner wall of the sealing gasket is provided with a second limiting groove (341), and the side wall of the sealing head (34) is provided with a second limiting protrusion for cooperating with the second limiting groove (341).

7. The fuel manifold according to claim 1, characterized in that: The outer wall of the outer sleeve nut (31) is provided with a force-applying structure, and the force-applying structure includes a knurling and / or an external hexagonal structure.

8. The fuel main pipe according to any one of claims 1 to 7, characterized in that: The structure of the assembly joint matches the connection structure.

9. The fuel main pipe according to any one of claims 1 to 7, characterized in that: The outer end of the first pipe segment is used to connect to the three-way joint (40), and the outer end of the third pipe segment is provided with the connection structure; there is an obtuse angle between the first pipe segment and the second pipe segment, and the interface corresponding to the first pipe segment on the three-way joint (40) used to connect the first branch pipe (30) or the second branch pipe (70) is arranged at a preset angle inclined toward the center direction of the fuel main pipe, so that the first pipe segment is installed on the three-way joint (40) in an inclined state and the second pipe segment is located in or tends to the axial direction.

10. An aircraft engine, characterized in that: A fuel main pipe according to any one of claims 1 to 9 is used.

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