Rotatable aero-engine fuel header pipe capable of being maintained in sections

Abstract

The invention discloses a rotatable aero-engine fuel main pipe capable of being maintained in a segmented mode, belongs to the technical field of fuel main pipes, and solves the problems that an existing aero-engine fuel main pipe cannot rotate and cannot be maintained in a segmented mode. According to the invention, the buckling connection of a polytetrafluoroethylene hose is replaced by the rotating and detachable connection mode between the anti-drop steel wire and the whole-circle annular groove as well as between the anti-drop steel wire and the threading hole, so that the angle between buckling joints does not need to be controlled when the fuel manifold is assembled on the premise of ensuring the reliable connection, the assembly difficulty is reduced, and the assembly efficiency is obviously improved; when the fuel main pipe is installed, the polytetrafluoroethylene hose, the buckling connector or the end connector are rotated, rapid installation can be achieved, the installation efficiency is improved, when the fuel main pipe needs to be disassembled, only the anti-disengaging steel wire needs to be knocked out of the whole annular groove, the disassembly-free and segmented maintenance functions are achieved, the use cost of the fuel main pipe is reduced, and the maintenance efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of fuel main pipes, and in particular to a rotatable and segmentally maintainable fuel main pipe for an aircraft engine. Background Art

[0002] The fuel main pipe of an aircraft engine is often a polytetrafluoroethylene fuel main pipe. The polytetrafluoroethylene fuel main pipe is generally a plurality of three-way or four-way metal crimping pipe joints and several sections of steel wire braided polytetrafluoroethylene hoses, which are crimped together; as a flexible pipeline, it is used for fuel supply to the aircraft engine casing.

[0003] The polytetrafluoroethylene fuel main pipe is usually connected by crimping, directly connecting the metal crimping pipe joint and the steel wire braided polytetrafluoroethylene hose together, and assembling the three-way or four-way metal crimping pipe joint and the nut by tightening the nut. However, this connection method has problems. For example, the polytetrafluoroethylene fuel main pipes disclosed in Chinese patent publications CN105299342A, CN114151827A, and CN203641746U are all crimped by metal crimping pipe joints and steel wire braided polytetrafluoroethylene hoses, and the metal crimping pipe joints cannot rotate freely. When assembling the fuel main pipe, the angles between the metal crimping pipe joints must be strictly controlled. As long as the angle of a metal crimping pipe joint deviates, the entire fuel main pipe may not be installed on the aircraft engine, or the fuel main pipe may be installed on the aircraft engine, resulting in distortion between the metal crimping pipe joint and the steel wire braided polytetrafluoroethylene hose. Long-term use may cause leakage at the crimping point, oil leakage, or even breakage of the steel wire braided polytetrafluoroethylene hose. During use, when a section of the steel wire braided polytetrafluoroethylene hose is damaged, the entire fuel main pipe must be replaced. At the same time, when assembling the tightening nut with the three-way or four-way metal crimping pipe joint, a closing machine is used to cause the tightening nut to produce plastic deformation. During this process, the tightening nut is prone to produce residual stress and internal cracks. Summary of the invention

[0004] In view of the above problems in the prior art, the present invention provides an aircraft engine fuel main pipe that is rotatable and can be maintained in sections, which solves the problem that the existing aircraft engine fuel main pipe cannot be rotated and cannot be maintained in sections.

[0005] In order to achieve the above object, the technical solution adopted by the present invention is as follows:

[0006] Provided is a rotatable and segmentally maintainable aircraft engine fuel main pipe, comprising a plurality of buckling assemblies connected by tee pipes, the free ends of the two buckling assemblies at both ends are connected with one end of the end joint, the other ends of the two end joints and the remaining ends of the plurality of tee pipes are rotatably provided with threading nuts; each buckling assembly comprises two buckling joints and a polytetrafluoroethylene hose, one end of each buckling joint is sleeved with a sleeve, a buckling ring groove is provided between the interior of each sleeve and the outer wall of the buckling joint, and the polytetrafluoroethylene hose is provided with a sleeve. The two ends of the fluoroethylene hose are respectively inserted into two crimping ring grooves; the two ends of the top of each tee pipe are sealed and connected with the other end of the crimping joint; a first semicircular ring groove is provided on the outer walls of the three ends of the tee pipe, and a second semicircular ring groove is provided inside the crimping joint; the adjacent first semicircular ring groove and the second semicircular ring groove are combined into a first full-circular ring groove for the anti-slip steel wire to pass through; two wire threading holes are provided on the outer wall of the crimping joint on the ring line of the second semicircular ring groove, and each wire threading hole is used to knock the anti-slip steel wire into or out of the full-circular ring groove.

[0007] The working principle of this scheme is that after the three-way pipe at one end of the crimping assembly is sealed and connected, the anti-slip steel wire is knocked into the full-circle annular groove through the threading hole on the three-way pipe. Therefore, the anti-slip steel wire not only realizes the function of connecting the crimping assembly and the three-way pipe, but also enables the connected crimping assembly and the three-way pipe to rotate relative to each other. When disassembly is required, it is only necessary to knock the anti-slip steel wire out of the full-circle annular groove. The rotating and detachable connection between the anti-slip steel wire and the full-circle annular groove replaces the crimping connection. Under the premise of ensuring reliable connection, it is possible to achieve that when assembling the fuel main pipe, there is no need to control the angles between the crimping joints, thereby reducing the difficulty of assembly and significantly improving assembly efficiency. At the same time, it realizes the functions of disassembly-free and segmented maintenance, reduces the use cost of the fuel main pipe, and improves maintenance efficiency.

[0008] Furthermore, each crimping joint is a stepped cylindrical structure with a hollow interior and openings at both ends, one end of the sleeve is clamped on the small-diameter end of the crimping joint, and a plurality of third semicircular annular grooves are provided on the outer wall of the small-diameter end of each crimping joint and the inner wall of each sleeve. The provision of the plurality of third semicircular annular grooves not only seals the polytetrafluoroethylene hose and the crimping joint, but also improves the connection strength between the polytetrafluoroethylene hose and the crimping joint.

[0009] Furthermore, the plurality of third semicircular annular grooves in each buckling ring groove are distributed at equal intervals.

[0010] Furthermore, the second semicircular annular groove is arranged on the inner wall of the large diameter end of the crimping joint, and a sealing ring groove is also provided on the inner wall of the large diameter end of the crimping joint, and a sealing ring is arranged in the sealing ring groove. The sealing ring groove provides a housing space for the sealing ring, and the sealing ring realizes the sealed connection between the crimping joint and the tee pipe.

[0011] Furthermore, the sealing ring groove is away from the end face of the large diameter end of the crimping connector, and the second semicircular annular groove is close to the end face of the large diameter end of the crimping connector. The positions of the sealing ring groove and the second semicircular annular groove are set in this way so that the anti-slip steel wire does not affect the sealing of the polytetrafluoroethylene hose and the crimping connector during the knocking-in and knocking-out process.

[0012] Furthermore, the inner wall of the large diameter end of the crimping joint is clearance-matched with the outer wall of the tee pipe and the outer wall of the end joint. The clearance fit facilitates plug-in connection and facilitates rotation and disassembly of the crimping joint in the tee pipe.

[0013] Furthermore, a second semicircular annular groove is provided on the outer wall at both ends of each end connector, a first semicircular annular groove matching the second semicircular annular groove is provided on the inner wall of each threading nut, and two threading holes are provided on the outer wall of the threading nut on the ring line of the second semicircular annular groove. The threading nut is also rotatably and detachably connected to the end connector and the tee pipe through an anti-slip steel wire.

[0014] Furthermore, the cross-sectional diameter of the anti-slip wire is smaller than the cross-sectional diameter of the full-circle annular groove. Setting the cross-sectional diameter of the anti-slip wire in this way facilitates the rotation and detachable connection between the crimping joint and the tee, the crimping joint and the end joint, the end joint and the threading nut, and the tee and the threading nut.

[0015] The invention discloses a rotatable and segmentally maintainable aviation engine fuel main pipe, which has the following beneficial effects:

[0016] The present invention replaces the crimping connection of the polytetrafluoroethylene hose by a rotating and detachable connection between the anti-slip steel wire and the full-circle annular groove and the threading hole. Under the premise of ensuring reliable connection, it is possible to achieve that when assembling the fuel main pipe, there is no need to control the angles between the crimping joints, thereby reducing the difficulty of assembly and significantly improving the assembly efficiency. When installing the fuel main pipe, the polytetrafluoroethylene hose, the crimping joint or the end joint can be rotated to achieve quick installation, thereby improving the installation efficiency. When disassembly is required, it is only necessary to knock the anti-slip steel wire out of the full-circle annular groove, thereby achieving the functions of disassembly-free and segmented maintenance, thereby reducing the use cost of the fuel main pipe and improving the maintenance efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the structure of the fuel main pipe of an aircraft engine;

[0018] Figure 2 This is an exploded view of the fuel main of an aircraft engine;

[0019] Figure 3 It is the connection diagram of the crimping assembly and the tee pipe;

[0020] Figure 4 It is a structural schematic diagram of the buckling assembly;

[0021] Figure 5 It is the internal connection diagram of the crimping assembly and the tee pipe;

[0022] Figure 6 It is a connection diagram of the crimping assembly and the end connector;

[0023] Figure 7 for Figure 1 The enlarged view of point I in the middle;

[0024] Figure 8 for Figure 1 The enlarged view of II in the middle;

[0025] Among them: 1. threading nut; 2. end joint; 3. sleeve; 4. polytetrafluoroethylene hose; 5. crimping joint; 6. tee pipe; 7. anti-slip steel wire; 8. sealing ring; 10. crimping assembly. DETAILED DESCRIPTION

[0026] The specific implementation modes of the present invention are described below so that those skilled in the art can understand the present invention. However, it should be clear that the present invention is not limited to the scope of the specific implementation modes. For those of ordinary skill in the art, as long as various changes are within the spirit and scope of the present invention as defined and determined by the attached claims, these changes are obvious, and all inventions and creations utilizing the concept of the present invention are protected.

[0027] refer to Figure 1 to Figure 3 This embodiment provides a rotatable and segmented maintainable fuel main pipe for an aircraft engine, comprising a plurality of buckling assemblies 10 connected by three-way pipes 6, the free ends of the two buckling assemblies 10 at both ends are connected to one end of the end joint 2, and the other ends of the two end joints 2 and the remaining ends of the plurality of three-way pipes 6 are rotatably provided with threading nuts 1. Replacing the tightening nut in the existing buckling connection method with the threading nut 1 can solve the problem of internal cracks and residual stress caused by the tightening nut during tightening and assembly, and reduce the risk of using the fuel main pipe with hidden dangers.

[0028] refer to Figure 4 Each crimping assembly 10 includes two crimping connectors 5 and a polytetrafluoroethylene hose 4. A sleeve 3 is sleeved on one end of each crimping connector 5. A crimping ring groove is provided between the interior of each sleeve 3 and the outer wall of the crimping connector 5. Both ends of the polytetrafluoroethylene hose 4 are respectively inserted into the two crimping ring grooves. A steel wire braided layer is provided on the polytetrafluoroethylene hose 4.

[0029] Specifically, refer to Figure 4As the specific structure of the crimping joint 5, the crimping joint 5 is made of metal. Each crimping joint 5 is a stepped cylindrical structure with a hollow interior and open ends. One end of the sleeve 3 is clamped on the small-diameter end of the crimping joint 5. A plurality of third semicircular annular grooves are provided on the outer wall of the small-diameter end of each crimping joint 5 and the inner wall of each sleeve 3. The plurality of third semicircular annular grooves in each crimping ring groove are equidistantly spaced. The provision of the plurality of third semicircular annular grooves not only seals the polytetrafluoroethylene hose 4 and the crimping joint 5, but also improves the connection strength between the polytetrafluoroethylene hose 4 and the crimping joint 5.

[0030] As a specific connection structure of the three-way pipe 6 and the crimping joint 5, refer to Figure 5 , both ends of the top of each tee pipe 6 are sealed and connected with the other end of the crimping joint 5. Specifically, a sealing ring groove is also provided on the inner wall of the large diameter end of the crimping joint 5, and a sealing ring 8 is arranged in the sealing ring groove. The sealing ring groove provides an accommodating space for the sealing ring 8, and the sealing ring 8 realizes the sealed connection between the crimping joint 5 and the tee pipe 6.

[0031] refer to Figure 6 and Figure 7 The three ends of the tee pipe 6 are provided with a first semicircular annular groove on their outer walls, and the inside of the crimping joint 5 is provided with a second semicircular annular groove, which is provided on the inner wall of the large diameter end of the crimping joint 5. The adjacent first semicircular annular groove and the second semicircular annular groove are combined into a first full-circular annular groove for the anti-slip wire 7 to pass through, and two wire-threading holes are provided on the outer wall of the crimping joint 5 on the ring line of the second semicircular annular groove, and each wire-threading hole is used to knock the anti-slip wire 7 into or out of the full-circular annular groove.

[0032] In this embodiment, the sealing ring groove is far away from the end face of the large diameter end of the crimping connector 5, and the second semicircular annular groove is close to the end face of the large diameter end of the crimping connector 5. The positions of the sealing ring groove and the second semicircular annular groove are set in this way so that the anti-dropping steel wire 7 does not affect the sealing between the polytetrafluoroethylene hose 4 and the crimping connector 5 during the knocking-in and knocking-out process. The inner wall of the large diameter end of the crimping connector 5 and the outer wall of the tee pipe 6 and the outer wall of the end connector 2 are all clearance-matched. The clearance fit facilitates plug-in and facilitates the rotation and disassembly of the crimping connector 5 in the tee pipe 6.

[0033] As the rotating and detachable connection structure of the threading nut 1 and the end connector 2 and the tee pipe 6, refer to Figure 6 and Figure 8 A second semicircular annular groove is provided on the outer wall at both ends of each end fitting 2, a first semicircular annular groove matching the second semicircular annular groove is provided on the inner wall of each threading nut 1, and two threading holes are provided on the outer wall of the threading nut 1 on the ring line of the second semicircular annular groove. The threading nut 1 is also connected to the end fitting 2 and the tee pipe 6 in a rotatable and detachable manner by means of the anti-slip steel wire 7.

[0034] In order to realize the rotation and detachable connection between the crimping joint 5 and the tee 6, the crimping joint 5 and the end joint 2, the end joint 2 and the threading nut 1, and the tee 6 and the threading nut 1. The cross-sectional diameter of the anti-slip wire 7 is smaller than the cross-sectional diameter of the full-circle annular groove.

[0035] The working principle of this scheme is that the structure of the anti-slip steel wire 7, the full-circle annular groove and the threading hole realizes the rotation and detachable connection between the crimping joint 5 and the tee 6, the crimping joint 5 and the end joint 2, the end joint 2 and the threading nut 1, and the tee 6 and the threading nut 1. When disassembly is required, it is only necessary to knock the anti-slip steel wire 7 out of the full-circle annular groove. Not only does it ensure reliable connection, it can achieve that when assembling the fuel main pipe, there is no need to control the angles between the crimping joints 5, which reduces the difficulty of assembly and significantly improves assembly efficiency. At the same time, it realizes the functions of disassembly-free and segmented maintenance, reduces the use cost of the fuel main pipe, and improves maintenance efficiency.

[0036] Although the specific implementation of the invention is described in detail in conjunction with the drawings, it should not be understood as limiting the scope of protection of this patent. Within the scope described in the claims, various modifications and variations that can be made by those skilled in the art without creative work still fall within the scope of protection of this patent.

Claims

1. A rotatable and segmentally maintainable aircraft engine fuel main pipe, characterized in that: It comprises a plurality of buckling assemblies (10) connected via three-way pipes (6), the free ends of the two buckling assemblies (10) located at the two ends are connected to one end of the end connector (2), and the other ends of the two end connectors (2) and the remaining ends of the plurality of three-way pipes (6) are rotatably provided with threading nuts (1); Each of the crimping assemblies (10) comprises two crimping joints (5) and a polytetrafluoroethylene hose (4), one end of each of the crimping joints (5) is sleeved with a sleeve (3), a crimping ring groove is provided between the interior of each sleeve (3) and the outer wall of the crimping joint (5), and the two ends of the polytetrafluoroethylene hose (4) are respectively inserted into the two crimping ring grooves; Both ends of the top of each of the three-way pipes (6) are sealed and connected to the other end of the crimping joint (5); a first semicircular ring groove is provided on the outer wall of the three ends of the three-way pipe (6); a second semicircular ring groove is provided inside the crimping joint (5); the adjacent first semicircular ring groove and the second semicircular ring groove are combined into a first full-circular ring groove for the anti-slip steel wire (7) to pass through; two wire threading holes are provided on the outer wall of the crimping joint (5) on the ring line of the second semicircular ring groove; each wire threading hole is used to knock the anti-slip steel wire (7) into or out of the full-circular ring groove.

2. The rotatable and segmentally maintainable aircraft engine fuel manifold according to claim 1, characterized in that: Each of the crimping joints (5) is a stepped cylindrical structure with a hollow interior and open ends. One end of the sleeve (3) is clamped on the small-diameter end of the crimping joint (5). A plurality of third semicircular annular grooves are provided on the outer wall of the small-diameter end of each crimping joint (5) and the inner wall of each sleeve (3).

3. The rotatable and segmentally maintainable aircraft engine fuel manifold according to claim 2, characterized in that: The plurality of third semicircular annular grooves in each of the buckling ring grooves are distributed at equal intervals.

4. The rotatable and segmentally maintainable aircraft engine fuel manifold according to claim 2, characterized in that: The second semicircular annular groove is arranged on the inner wall of the large diameter end of the crimping joint (5), and a sealing ring groove is also provided on the inner wall of the large diameter end of the crimping joint (5), and a sealing ring (8) is arranged in the sealing ring groove.

5. The rotatable and segmentally maintainable aircraft engine fuel manifold according to claim 2, characterized in that: The sealing ring groove is far away from the end surface of the large diameter end of the crimping joint (5), and the second semicircular annular groove is close to the end surface of the large diameter end of the crimping joint (5).

6. The rotatable and segmentally maintainable aircraft engine fuel manifold according to claim 2, characterized in that: The inner wall of the large diameter end of the crimping joint (5) is clearance-matched with the outer wall of the tee pipe (6) and the outer wall of the end joint (2).

7. The rotatable and segmentally maintainable aircraft engine fuel manifold according to claim 1, characterized in that: The second semicircular annular groove is provided on the outer walls at both ends of each of the end connectors (2), the first semicircular annular groove cooperating with the second semicircular annular groove is provided on the inner wall of each of the threading nuts (1), and two threading holes are provided on the outer wall of the threading nut (1) on the ring line of the second semicircular annular groove.

8. The rotatable and segmentally maintainable aircraft engine fuel manifold according to claim 1, characterized in that: The cross-sectional diameter of the anti-slip steel wire (7) is smaller than the cross-sectional diameter of the full-circle annular groove.

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