Dual fuel line fuel main pipe, fuel supply system and aircraft engine

Abstract

The present invention discloses a dual-oil fuel manifold, a fuel supply system and an aircraft engine, wherein the dual-oil fuel manifold comprises a first oil pipe, a second oil pipe, an adapter and a connecting nut, wherein the adapter is provided with a first oil passage and a second oil passage; the adapter comprises a first section and a second section, an oil collecting step is formed between the second section and the first section, the end face of the second section is used to enclose a first oil collecting cavity with a fuel nozzle, and the oil collecting step is used to enclose a second oil collecting cavity with the fuel nozzle; the first end of the first oil passage is connected to the first oil pipe, and the second end of the first oil passage is communicated with the first oil collecting cavity; the first end of the second oil passage is connected to the second oil pipe, and the second end of the second oil passage is communicated with the second oil collecting cavity; the connecting nut is sleeved on the adapter and is used to be fixedly connected with the fuel nozzle. The dual-oil fuel manifold provided by the present invention has a simple and compact structure, can simplify the assembly steps, and reduce the risk of oil cross-talk and oil leakage.

Description

Technical Field

[0001] The present invention relates to the technical field of fuel manifolds of aircraft engines, and in particular to a dual-oil-circuit fuel manifold, a fuel supply system using the dual-oil-circuit fuel manifold, and an aircraft engine using the fuel supply system. Background Art

[0002] At present, in aircraft engines, in order to meet the technical requirements of engine ignition performance, lean flameout performance, combustion efficiency, combustion stability, combustion chamber outlet temperature distribution and exhaust pollution, the fuel supply method of the combustion chamber is developing towards the direction of time-sharing and zone-sharing, and the dual oil circuit design has been widely used in the combustion chambers of aircraft engines at home and abroad.

[0003] As an important component of the aircraft engine fuel supply system, the fuel main pipe is generally annular and surrounds the outer surface of the combustion chamber casing. It is connected to the fuel nozzle through the joint led out from the fuel main pipe. Its main function is to evenly supply fuel to the fuel nozzle. In order to adapt to the development trend of multiple oil circuits, the number and complexity of fuel main pipes are also gradually increasing, which will bring about problems such as difficulty in installing the fuel main pipe, oil cross-linking between the main and auxiliary oil circuits, and fuel leakage. Specifically, for the fuel supply system designed with dual oil circuits, two sets of fuel main pipes are usually required to be laid out, one set of fuel main pipes is responsible for supplying the main oil circuit, and the other set of fuel main pipes is responsible for supplying the auxiliary oil circuit. The two sets of fuel main pipes are installed independently, with a large number of parts and occupying a large space, making it difficult to adapt to small and medium-sized engines. In addition, due to the different size specifications of the main oil circuit main pipe and the auxiliary oil circuit main pipe, in order to avoid wrong installation, it is also necessary to do a good job of marking and carry out error-proofing design, and the assembly steps are cumbersome. Summary of the invention

[0004] The present invention primarily provides a dual-oil-circuit fuel manifold to solve the technical problems that the existing fuel manifold adopts a dual-oil-circuit design, which results in a large number of parts, a large occupied space and complicated assembly steps.

[0005] The present invention also provides a fuel supply system, which adopts the above-mentioned dual-oil-circuit fuel main pipe.

[0006] The present invention also provides an aircraft engine which adopts the above-mentioned oil supply system.

[0007] According to a first aspect of the present invention, there is provided a dual-oil fuel manifold, comprising a first oil pipe, a second oil pipe, an adapter and a connecting nut, wherein a first oil channel and a second oil channel are provided in the adapter;

[0008] The adapter comprises a first segment and a second segment arranged in the axial direction, the outer diameter of the second segment is smaller than the outer diameter of the first segment, so as to form an oil collecting step between the second segment and the first segment, a surface of the second segment away from the first segment is used to enclose a first oil collecting cavity with the fuel nozzle, and the oil collecting step is used to enclose a second oil collecting cavity with the fuel nozzle;

[0009] The first end of the first oil passage is disposed on a side of the first segment away from the second segment and connected to the first oil pipe, and the second end of the first oil passage is communicated with the first oil collecting chamber;

[0010] The first end of the second oil passage is arranged on a side of the first segment away from the second segment and connected to the second oil pipe, and the second end of the second oil passage is communicated with the second oil collecting chamber;

[0011] The connecting nut is rotatably sleeved on the adapter and is used for fixed connection with the fuel nozzle.

[0012] Preferably, at least one first annular groove is provided on the outer periphery of the first segment along the axial direction of the first segment, and the dual-oil fuel main pipe also includes a first sealing ring embedded in the first annular groove and used to abut the fuel nozzle, and the first sealing ring is provided at one end of the second oil collecting chamber away from the first oil collecting chamber.

[0013] Preferably, at least one second annular groove is provided on the outer periphery of the second segment along the axial direction of the second segment, and the dual-oil fuel main pipe also includes a second sealing ring embedded in the second annular groove and used to abut the fuel nozzle, and the second sealing ring is provided between the first oil collecting chamber and the second oil collecting chamber.

[0014] Preferably, the connecting nut includes a connecting ring and a limiting portion provided on the connecting ring, the connecting ring is sleeved on the outer periphery of the first segment and has a connecting gap relative to the first segment, the connecting gap is used to accommodate the stud of the fuel nozzle, the connecting ring is provided with an internal thread for threaded connection with the stud, and the limiting portion is used to abut against a side of the first segment away from the second segment.

[0015] More preferably, a limiting step is provided on a side of the first segment away from the second segment, and the limiting step includes an annular limiting wall extending along the axial direction of the first segment. The limiting portion is embedded in the limiting step and pressed against the annular limiting wall, so that the connecting nut is radially limited relative to the first segment through the limiting cooperation between the limiting portion and the annular limiting wall.

[0016] Furthermore, a limiting flange for abutting against the fuel nozzle is provided on the side wall of the first segment.

[0017] Furthermore, the first oil pipe and the second oil pipe each include a plurality of sections of hoses, a metal connecting pipe connected to the hoses, and a three-way joint provided between two adjacent sections of the hoses;

[0018] In two adjacent sections of hose, the first end of the three-way joint is connected to the metal connecting pipe on one section of the hose, the second end of the three-way joint is connected to the metal connecting pipe on the other section of the hose, and the third end of the three-way joint is connected to the adapter.

[0019] According to a second aspect of the present invention, there is also provided a fuel supply system, comprising the above-mentioned dual-oil-circuit fuel main pipe and a fuel nozzle connected to the dual-oil-circuit fuel main pipe, the fuel nozzle being provided with a first injection channel connected to the first oil collecting chamber and a second injection channel connected to the second oil collecting chamber.

[0020] Preferably, the fuel nozzle comprises a stud threadedly connected to the connecting nut, the end surface of the stud is provided with a receiving cavity, the receiving cavity comprises a first oil collecting groove and a second oil collecting groove, and a first sealing wall provided at an end of the second oil collecting groove away from the first oil collecting groove, and a second sealing wall provided between the first oil collecting groove and the second oil collecting groove;

[0021] The adapter is inserted into the accommodating cavity, and a side of the second segment away from the first segment is used to enclose a first oil collecting cavity with the first oil collecting groove, and the oil collecting step is used to enclose a second oil collecting cavity with the second oil collecting groove, and the first sealing wall is tightly matched with the outer periphery of the first segment, and the second sealing wall is tightly matched with the outer periphery of the second segment.

[0022] According to a third aspect of the present invention, there is also provided an aircraft engine comprising the above-mentioned fuel supply system.

[0023] The present invention has the following beneficial effects:

[0024] The dual-oil-circuit fuel main pipe provided by the present invention connects the first oil pipe and the second oil pipe into one body through an adapter, so that the first oil pipe and the second oil pipe are integrated into a set of fuel main pipe and can be installed at the same time. Compared with the method of separately installing two sets of fuel main pipes, the number of related spare parts is effectively reduced, the assembly steps are simplified, there are fewer leakage points, the sealing is better, and the occupied space is reduced, so that it can be better suitable for small and medium-sized engines. Secondly, the first and second sections on the adapter are utilized to enclose the first oil collecting chamber and the second oil collecting chamber with the fuel nozzle, and the first oil collecting chamber and the second oil collecting chamber are relatively independently arranged. After the adapter is connected to the fuel nozzle, the first oil collecting chamber and the second oil collecting chamber can be directly connected to different injection channels on the fuel nozzle. There is no need to configure different pipe joints for the first oil pipe and the second oil pipe to connect with the fuel nozzle, which effectively reduces the number of interfaces, facilitates the installation of the fuel nozzle, and reduces the risk of oil cross-talk and fuel leakage between the dual-oil-circuit fuel main pipe and the fuel nozzle.

[0025] In addition to the above-described purposes, features and advantages, the present invention has other purposes, features and advantages. The present invention will be further described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The drawings constituting a part of this application are used to provide a further understanding of the present invention. The exemplary 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:

[0027] Figure 1 A schematic cross-sectional structure diagram of an oil supply system provided by an embodiment of the present invention;

[0028] Figure 2 for Figure 1 The schematic diagram of the structure of the dual fuel manifold along the AA direction in the fuel supply system shown in FIG.

[0029] Figure 3 for Figure 1 The schematic diagram of the structure of the dual fuel main pipe along the BB direction in the fuel supply system shown.

[0030] Legend:

[0031] 1000, dual oil circuit fuel main pipe; 1, first oil pipe; 2, second oil pipe; 3, adapter; 301, first oil channel; 302, second oil channel; 303, first oil collecting chamber; 304, second oil collecting chamber; 31, first section; 311, first annular groove; 312, limiting step; 3121, annular limiting wall; 313, limiting flange; 32, second section; 321, second annular groove; 33, oil collecting step; 4, connecting screw nut; 41, connecting ring; 411, internal thread; 42, limiting portion; 5, first sealing ring; 6, second sealing ring; 7, hose; 8, metal connecting pipe; 9, three-way joint; 2000, fuel nozzle; 2001, first fuel injection channel; 2002, second fuel injection channel; 2003, stud; 2004, receiving chamber; 2005, first oil collecting tank; 2006, second oil collecting tank; 2007, first sealing wall; 2008, second sealing wall. DETAILED DESCRIPTION

[0032] The embodiments of the present invention are described in detail below with reference to the accompanying drawings. However, the present invention can be implemented in many different ways as defined and covered below.

[0033] Figures 1 to 3 The dual-oil-circuit fuel main pipe provided by an embodiment of the present invention is collectively shown, which is used to be arranged in the fuel supply system of an aircraft engine and provide fuel to the aircraft engine. Its structure is simple and compact, effectively reduces the occupied space, is convenient for assembly, and is conducive to the miniaturization design of the aircraft engine.

[0034] like Figure 1 As shown, the dual-oil fuel main pipe 1000 includes a first oil pipe 1, a second oil pipe 2, an adapter 3 and a connecting nut 4, and the adapter 3 is provided with a first oil channel 301 and a second oil channel 302 which are independent of each other.

[0035] Specifically, the adapter 3 includes a first segment 31 and a second segment 32 arranged in sequence along its axial direction, the first segment 31 and the second segment 32 are both cylindrical, and the first segment 31 and the second segment 32 are coaxially arranged, the outer diameter of the second segment 32 is smaller than the outer diameter of the first segment 31, so as to form an oil collecting step 33 between the second segment 32 and the first segment 31, and the side of the second segment 32 away from the first segment 31 is used to enclose a first oil collecting chamber 303 with the fuel nozzle 2000, and the oil collecting step 33 is used to enclose a second oil collecting chamber 304 with the fuel nozzle 2000.

[0036] Further, the first end of the first oil passage 301 is arranged on a side of the first segment 31 away from the second segment 32 and connected to the first oil pipe 1, the second end of the first oil passage 301 is communicated with the first oil collecting chamber 303, the first end of the second oil passage 302 is arranged on a side of the first segment 31 away from the second segment 32 and connected to the second oil pipe 2, and the second end of the second oil passage 302 is communicated with the second oil collecting chamber 303. The connecting nut 4 is rotatably sleeved on the adapter 3 and is used to be fixedly connected to the fuel nozzle 2000, so that the fuel nozzle 2000 can be detachably mounted on the adapter 3.

[0037] The dual-oil-circuit fuel manifold 1000 connects the first oil pipe 1 and the second oil pipe 2 into one body through the adapter 3, so that the first oil pipe 1 and the second oil pipe 2 are integrated into a set of fuel manifolds and can be installed at the same time. Compared with the method of installing two sets of fuel manifolds separately, the number of related spare parts is effectively reduced, the assembly steps are simplified, and there are fewer leakage points, better sealing, and reduced occupied space, so that the dual-oil-circuit fuel manifold 1000 can be better suitable for small and medium-sized engines. Secondly, the first and second sections on the adapter 3 are utilized to enclose the first oil collecting chamber 303 and the second oil collecting chamber 304 together with the fuel nozzle 2000, and the first oil collecting chamber 303 and the second oil collecting chamber 304 are relatively independently arranged, so that after the adapter 3 is connected to the fuel nozzle 2000, the first oil collecting chamber 303 and the second oil collecting chamber 304 can be directly connected to different injection channels on the fuel nozzle 2000, without configuring different pipe joints for the first oil pipe 1 and the second oil pipe 2 to connect the fuel nozzle 2000, thereby effectively reducing the number of interfaces, facilitating the installation of the fuel nozzle 2000, and reducing the risk of oil cross-talk and fuel leakage between the dual-oil fuel main pipe 1000 and the fuel nozzle 2000.

[0038] Preferably, the second oil collecting chamber 304 is arranged around the outer circumference of the adapter 3, so that when the fuel nozzle 2000 is rotated to different angles relative to the adapter 3, the injection channels on the fuel nozzle 2000 can directly connect to the second oil collecting chamber 304, which is easy to install and can flexibly adjust the installation angle of the fuel nozzle 2000 to meet the injection requirements at different angles.

[0039] Preferably, at least one first annular groove 311 is provided on the outer periphery of the first segment 31 along the axial direction of the first segment 31, and the dual-oil-circuit fuel main pipe 1000 also includes a first sealing ring 5 embedded in the first annular groove 311 and used to abut the fuel nozzle 2000, and the first sealing ring 5 is provided at the end of the second oil collecting chamber 304 away from the first oil collecting chamber 303, and the end of the second oil collecting chamber 304 away from the first oil collecting chamber 303 is sealed by the first sealing ring 5 to avoid fuel leakage, and the structure is simple and the sealing effect is good.

[0040] Furthermore, two first annular grooves 311 are provided, and the two first annular grooves 311 are arranged at intervals along the axial direction of the first segment 31. Two first sealing rings 5 ​​are correspondingly provided, and the two first sealing rings 5 ​​are installed in the two first annular grooves 311 one by one. Double sealing effect is achieved by the two first sealing rings 5, thereby strengthening the sealing effect of the second oil collecting chamber 304 and the first oil collecting chamber 303 relative to the outside world.

[0041] Preferably, at least one second annular groove 321 is provided on the outer periphery of the second segment 32 along the axial direction of the second segment 32, and the dual-oil-circuit fuel main pipe 1000 also includes a second sealing ring 6 embedded in the second annular groove 321 and used to abut the fuel nozzle 2000, and the second sealing ring 6 is provided between the first oil collecting chamber 303 and the second oil collecting chamber 304, and the isolation seal between the first oil collecting chamber 303 and the second oil collecting chamber 304 is realized by the second sealing ring 6 to avoid oil cross-talk between the first oil collecting chamber 303 and the second oil collecting chamber 304.

[0042] Preferably, the connecting nut 4 includes a connecting ring 41 and a limiting portion 42 provided on the connecting ring 41, the connecting ring 41 is sleeved on the outer periphery of the first segment 31 and has a connecting gap relative to the first segment 31, the connecting gap is used to accommodate the stud 2003 of the fuel nozzle 2000, and the inner wall of the connecting ring 41 is provided with an internal thread 411 for threaded connection with the stud 2003, the limiting portion 42 is provided at one end of the connecting ring 41 away from the second segment 32, and the limiting portion 42 is used to abut against a side of the first segment 31 away from the second segment 32.

[0043] Specifically, the connecting nut 4 is integrally sleeved on the adapter 3, and before the fuel nozzle 2000 is installed, the connecting nut 4 can move freely in the axial and circumferential directions. When the stud 2003 of the fuel nozzle 2000 is inserted into the connection gap, the connecting nut 4 can be driven to rotate so that the connecting ring 41 is threadedly connected with the stud 2003, and the connecting nut 4 is stopped in the axial direction through the limiting cooperation between the limiting portion 42 and the end face of the first segment 31, so that the fuel nozzle 2000 is installed on the adapter 3 with high precision, and the assembly structure is simple and efficient, which can ensure the installation stability of the fuel nozzle 2000.

[0044] More preferably, a limiting step 312 is provided on a side of the first segment 31 away from the second segment 32, and the limiting step 312 includes an annular limiting wall 3121 extending axially along the first segment 31, and the limiting portion 42 is embedded in the limiting step 312 and pressed against the annular limiting wall 3121, so that the connecting nut 4 is radially limited relative to the first segment 31 through the limiting cooperation between the limiting portion 42 and the annular limiting wall, so that the connecting nut 4 and the first segment 31 remain coaxial, avoid misalignment of the connecting nut 4, facilitate docking with the fuel nozzle 2000, and through the close cooperation between the limiting portion 42 and the limiting step 312, the contact area between the connecting nut 4 and the first segment 31 is expanded, and the sealing effect of the second oil collecting chamber 304 is further improved.

[0045] Furthermore, a limiting flange 313 for abutting the fuel nozzle 2000 is provided on the side wall of the first segment 31. The limiting flange 313 is provided on an end of the first segment 31 away from the second segment 32. The fuel nozzle 2000 is pressed and fixed by the limiting flange 313, so that the installation positioning of the fuel nozzle 2000 can be achieved, the installation accuracy of the fuel nozzle 2000 can be ensured, and the sealing effect between the fuel nozzle 2000 and the adapter 3 can be improved.

[0046] Please combine Figure 2 and Figure 3 , the first oil pipe 1 and the second oil pipe 2 both include a multi-section hose 7, a metal connecting pipe 8 connected to the end of the hose 7, and a three-way joint 9 provided between two adjacent hose sections 7. In two adjacent hose sections 7, the first end of the three-way joint 9 is connected to the metal connecting pipe 8 on one of the hose sections 7, the second end of the three-way joint 9 is connected to the metal connecting pipe 8 on the other hose section 7, and the third end of the three-way joint 9 is connected to the first oil passage 301 or the second oil passage 302 on the adapter 3.

[0047] Furthermore, the calibers of the hose 7 in the first oil pipe 1 and the hose 7 in the second oil pipe 2 are different to meet different oil supply requirements. The hose 7 has a multi-layer structure, the innermost layer is a polytetrafluoroethylene inner tube, the middle layer is a steel wire braided layer, and the outermost layer is covered with a rubber fireproof sleeve, wherein the steel wire braided layer is used to increase the strength of the hose 7, and the rubber fireproof sleeve is used to prevent fire and wear, so that the hose 7 has a certain structural strength and high temperature resistance effect while having flexibility, thereby improving the performance of the hose 7.

[0048] Most of the sections in the first oil pipe 1 and the second oil pipe 2 are connected by the hose 7. Since the hose 7 is soft and has a large degree of freedom, it is convenient to layout and install the dual-oil fuel main pipe 1000 as a whole in the aircraft engine, and it is convenient to flexibly adjust the installation position of the fuel nozzle 2000 to adapt to more usage requirements, while having excellent safety, reliability and stability.

[0049] In other embodiments, the first end and / or the second end of the three-way joint 9 can also be directly connected to the hose 7. Removing the metal connecting pipe 8 can further improve the degree of freedom between the hose 7 and the three-way joint 9, making the assembly of the first oil pipe 1 and the second oil pipe 2 more flexible.

[0050] like Figure 1 As shown, as a second aspect, an embodiment of the present invention further provides a fuel supply system, comprising the above-mentioned dual-oil fuel manifold 1000 and a fuel nozzle 2000 connected to the dual-oil fuel manifold 1000, wherein the fuel nozzle 2000 is provided with a first fuel injection channel 2001 and a second fuel injection channel 2002. The fuel nozzle 2000 is fixedly mounted on the adapter 3 through the connecting nut 4, and the first fuel injection channel 2001 is connected to the first oil collecting chamber 303, and the second fuel injection channel 2002 is connected to the second oil collecting chamber 304. The two fuel injection channels can be connected at the same time in one installation process, and the installation is convenient and quick, and there is no need to design an error-proofing mark, which is conducive to ensuring the accuracy of the installation.

[0051] Preferably, the fuel nozzle 2000 includes a stud 2003 threadedly connected to the connecting nut 4, and the end face of the stud 2003 is provided with a receiving cavity 2004, and the receiving cavity 2004 includes a first oil collecting groove 2005 and a second oil collecting groove 2006, as well as a first sealing wall 2007 arranged at one end of the second oil collecting groove 2006 away from the first oil collecting groove 2005, and a second sealing wall 2008 arranged between the first oil collecting groove 2005 and the second oil collecting groove 2006.

[0052] The adapter 3 is inserted into the receiving cavity 2004, and the side of the second segment 32 away from the first segment 31 is used to enclose the first oil collecting cavity 303 with the first oil collecting groove 2005, and the oil collecting step 33 is used to enclose the second oil collecting cavity 304 with the second oil collecting groove 2006. The first sealing wall 2007 is tightly matched with the outer periphery of the first segment 31 to achieve the sealing of the second oil collecting cavity 304 relative to the outside. The second sealing wall 2008 is tightly matched with the outer periphery of the second segment 32 to achieve the sealing between the first oil collecting cavity 303 and the second oil collecting cavity 304.

[0053] The fuel nozzle 2000 receives the adapter 3 via the receiving cavity 2004, and can respectively form the first oil collecting cavity 303 and the second oil collecting cavity 304 at different positions of the adapter 3, and simultaneously realize sealing cooperation at multiple positions. The assembly structure is simple and efficient, which can reduce assembly parts, simplify assembly steps, improve assembly stability, and avoid problems of oil cross-talk and fuel leakage.

[0054] As a third aspect, an embodiment of the present invention further provides an aircraft engine (not shown in the figure, the same below), including the above-mentioned fuel supply system, and the aircraft engine is provided with fuel through the fuel supply system, which can realize refined fuel supply in time and region, and meet the requirements of the ignition performance, lean oil flameout performance, combustion efficiency, combustion stability, combustion chamber outlet temperature distribution and exhaust pollution of the aircraft engine. In addition, since the structure of the dual-oil fuel main pipe 1000 is simple and compact, it is convenient and flexible to layout, which is conducive to realizing the miniaturized design of the aircraft engine.

[0055] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A dual-oil fuel manifold, characterized in that: It comprises a first oil pipe (1), a second oil pipe (2), an adapter (3) and a connecting nut (4); the adapter (3) is provided with a first oil passage (301) and a second oil passage (302); The adapter (3) comprises a first segment (31) and a second segment (32) arranged in the axial direction, the outer diameter of the second segment (32) being smaller than the outer diameter of the first segment (31), so as to form an oil collecting step (33) between the second segment (32) and the first segment (31), a surface of the second segment (32) away from the first segment (31) being used to enclose a first oil collecting cavity (303) with the fuel nozzle (2000), and the oil collecting step (33) being used to enclose a second oil collecting cavity (304) with the fuel nozzle (2000); The first end of the first oil passage (301) is arranged on a side of the first segment (31) away from the second segment (32) and is connected to the first oil pipe (1), and the second end of the first oil passage (301) is in communication with the first oil collecting chamber (303); The first end of the second oil passage (302) is arranged on a side of the first segment (31) away from the second segment (32) and connected to the second oil pipe (2), and the second end of the second oil passage (302) is communicated with the second oil collecting chamber (304); The connecting nut (4) is rotatably sleeved on the adapter (3) and is used for fixed connection with the fuel nozzle (2000).

2. The dual-oil fuel manifold according to claim 1, characterized in that: The outer periphery of the first segment (31) is provided with at least one first annular groove (311) along the axial direction of the first segment (31); the dual-oil fuel main pipe also includes a first sealing ring (5) embedded in the first annular groove (311) and used to abut the fuel nozzle (2000); the first sealing ring (5) is provided at one end of the second oil collecting chamber (304) away from the first oil collecting chamber (303).

3. The dual-oil fuel manifold according to claim 1, characterized in that: The outer periphery of the second segment (32) is provided with at least one second annular groove (321) along the axial direction of the second segment (32); the dual-oil fuel main pipe also includes a second sealing ring (6) embedded in the second annular groove (321) and used to abut the fuel nozzle (2000); the second sealing ring (6) is provided between the first oil collecting chamber (303) and the second oil collecting chamber (304).

4. The dual-oil fuel manifold according to claim 1, characterized in that: The connecting nut (4) comprises a connecting ring (41) and a limiting portion (42) arranged on the connecting ring (41); the connecting ring (41) is sleeved on the outer periphery of the first segment (31) and has a connecting gap relative to the first segment (31); the connecting gap is used to accommodate the stud (2003) of the fuel nozzle (2000); the connecting ring (41) is provided with an internal thread (411) for threaded connection with the stud (2003); and the limiting portion (42) is used to abut against a side of the first segment (31) away from the second segment (32).

5. The dual-oil fuel manifold according to claim 4, characterized in that: A limiting step (312) is provided on one side of the first segment (31) away from the second segment (32), and the limiting step (312) includes an annular limiting wall (3121) extending along the axial direction of the first segment (31), and the limiting portion (42) is embedded in the limiting step (312) and pressed against the annular limiting wall (3121), so that the connecting nut (4) is radially limited relative to the first segment (31) through the limiting cooperation between the limiting portion (42) and the annular limiting wall (3121).

6. The dual-oil fuel manifold according to claim 1, characterized in that: A limiting flange (313) for abutting against the fuel nozzle (2000) is provided on the side wall of the first segment (31).

7. The dual-oil fuel manifold according to claim 1, characterized in that: The first oil pipe (1) and the second oil pipe (2) both comprise a plurality of sections of hose (7), a metal connecting pipe (8) connected to the hose (7), and a three-way joint (9) provided between two adjacent sections of the hose (7); In two adjacent sections of hose (7), the first end of the three-way joint (9) is connected to the metal connecting pipe (8) on one section of the hose (7), the second end of the three-way joint (9) is connected to the metal connecting pipe (8) on the other section of the hose (7), and the third end of the three-way joint (9) is connected to the adapter (3).

8. An oil supply system, characterized in that: It comprises a dual-oil-circuit fuel main pipe as claimed in any one of claims 1 to 7 and a fuel nozzle (2000) connected to the dual-oil-circuit fuel main pipe, wherein the fuel nozzle (2000) is provided with a first injection channel (2001) connected to the first oil collecting chamber (303) and a second injection channel (2002) connected to the second oil collecting chamber (304).

9. The oil supply system according to claim 8, characterized in that: The fuel nozzle (2000) comprises a stud (2003) threadedly connected to the connecting nut (4); an end surface of the stud (2003) is provided with a receiving cavity (2004); the receiving cavity (2004) comprises a first oil collecting groove (2005) and a second oil collecting groove (2006); a first sealing wall (2007) provided at an end of the second oil collecting groove (2006) away from the first oil collecting groove (2005); and a second sealing wall (2008) provided between the first oil collecting groove (2005) and the second oil collecting groove (2006); The adapter (3) is inserted into the accommodating cavity (2004); a side of the second segment (32) away from the first segment (31) is used to enclose a first oil collecting cavity (303) with the first oil collecting groove (2005); the oil collecting step (33) is used to enclose a second oil collecting cavity (304) with the second oil collecting groove (2006); the first sealing wall (2007) is tightly matched with the outer periphery of the first segment (31); and the second sealing wall (2008) is tightly matched with the outer periphery of the second segment (32).

10. An aircraft engine, characterized in that: Comprising the oil supply system as claimed in claim 8 or 9.

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