Fuel manifold non-uniformity test switching section structure and fuel manifold non-uniformity test device

Abstract

The invention discloses a fuel manifold non-uniformity test switching section structure and a fuel manifold non-uniformity test device. The fuel manifold non-uniformity test switching section structure comprises a first mounting disc, a plurality of nozzle fixing assemblies and a plurality of oil return pipe fittings. Each nozzle fixing assembly is detachably fixed to the first mounting disc, a first oil through hole is further formed in each nozzle fixing assembly, and each nozzle is detachably connected with the corresponding nozzle fixing assembly through a fastening connecting piece. The oil inlet end of each oil return pipe fitting is detachably connected with the first mounting disc, the oil outlet end of each oil return pipe fitting is connected with a non-uniformity measuring system, each oil return pipe fitting is further internally provided with a second oil through hole penetrating in the length direction of the oil return pipe fitting, and the oil outlet end of the nozzle fixing assembly extends into the oil inlet end of the correspondingly arranged oil return pipe fitting; and the first oil through hole is communicated with the second oil through hole. The structure is of a split type design, the overall adaptability and maintainability are good, the test efficiency can be greatly improved, the test cost is effectively reduced, and meanwhile the application range of the test device is widened.

Description

Technical Field

[0001] The present invention relates to the technical field of aircraft engine fuel supply system test equipment, and in particular, to a fuel manifold unevenness test adapter structure. Furthermore, the present invention also relates to a fuel manifold unevenness test device including the fuel manifold unevenness test adapter structure. Background Art

[0002] For aircraft engines with a nozzle at the end of the fuel supply system, the nozzle is usually connected to the fuel manifold, and the two are fastened and prevented from loosening by using appropriate tightening torque and self-locking structure. The assembly of the nozzle and the fuel manifold needs to be checked for flow unevenness before installation to ensure that the performance of the combustion chamber components meets the installation requirements. Before conducting the fuel manifold unevenness test, the nozzle and fuel manifold assembly needs to be fixed on the test transfer stage of the fuel manifold unevenness test device to prevent oil backflow during the test and affect the test results. The nozzle and fuel manifold assembly is usually fastened to the test adapter section by fastening screws or clamping rods. During the engine development process, the fuel manifold unevenness test needs to be carried out many times, so the fastening screws need to be repeatedly disassembled and assembled, and the clamping rod needs to be repeatedly pressed.

[0003] In the prior art, the fastening device for the nozzle and the fuel manifold assembly mostly adopts an integrated design, including a fuel pipe joint and a fuel nozzle fixing plate, such as Figure 1 As shown, the nozzle is fixed to the fuel nozzle fixing plate by fastening screws; or includes a pressing rod, a pipe joint, a mounting seat and a first mounting plate, etc., as shown in FIG. Figure 2 As shown, the nozzle is fixed on the first mounting plate through the cooperation of the pressing rod and the mounting seat.

[0004] In order to reduce weight and processing costs, the fastening device of the nozzle and fuel manifold assembly is usually processed from aluminum. However, due to repeated disassembly and assembly of the fastening screws or repeated pressing of the clamping plate, the fuel nozzle fastening screw mounting holes or welded mounting seats and clamping rods on the fastening device are easily damaged. The integrated fastening device has poor maintainability, so its service life is relatively short. The installation progress of the nozzle and fuel manifold assembly may even be delayed due to maintenance of the fastening device. Summary of the Invention

[0005] The present invention provides a fuel manifold unevenness test adapter section structure and a fuel manifold unevenness test device to address the technical problems of existing integrated fastening devices, such as poor maintainability, relatively short service life, and even the possibility of delaying the installation progress of the nozzle and fuel manifold assembly due to maintenance of the fastening devices.

[0006] The technical solution adopted in the present invention is as follows:

[0007] 4. The repairing kit for automotive dents, according to claim 1, wherein a bottom of the foot stand comprises a through-hole, and the two foot pieces comprise two bosses, wherein the bosses comprise a through-hole, a screw bolt, and a nut. The through-hole comprises a screw bolt, and a nut. The through-hole comprises a screw bolt, and a nut. The through-hole comprises a screw bolt, and a nut.

[0008] Furthermore, a number of mounting through holes arranged through the plate surface are sequentially spaced in the circumferential direction of the first mounting disk; the nozzle fixing assembly includes a second mounting disk, an oil guide rod and a locking nut fixedly connected to the second mounting disk along the axial direction, and the first oil through hole is arranged axially through the second mounting disk and the oil guide rod; the oil guide rod is passed through the corresponding mounting through hole, and an external thread is processed on the outer circle of the oil guide rod, and the locking nut is threadedly connected to the outer circle of the oil guide rod; a threaded through hole arranged through the plate surface is provided on the second mounting disk, and the nozzle is detachably fixed to the second mounting disk by a fastening connector passing through it and the threaded through hole, and the second mounting disk is pressed and fixed to the first mounting disk under the action of the oil guide rod and the locking nut.

[0009] Furthermore, the nozzle fixing assembly also includes a positioning block connected to the connection between the second mounting plate and the oil guide rod; the hole wall of the mounting through hole is also provided with an inner recess to accommodate a card slot of the positioning block, so that when the oil guide rod is inserted into the mounting through hole, the positioning block is inserted into the card slot to limit the circumferential rotation of the oil guide rod under force.

[0010] Furthermore, each group of nozzles is fixed to the second mounting plate by two symmetrically arranged groups of fastening connectors; the number of threaded through holes is even, and every two threaded through holes are combined into a group, and the two threaded through holes in each group are symmetrically arranged about the center of the second mounting plate.

[0011] Furthermore, the number of positioning blocks is equal to the number of threaded through holes, and multiple positioning blocks and multiple threaded through holes are arranged in sequence along the circumferential direction; the number of card slots is equal to the number of positioning blocks, and several card slots are arranged in sequence along the circumference of the mounting through holes and are respectively connected to the mounting through holes.

[0012] Furthermore, the oil return pipe fitting includes a hollow oil return pipe, a mounting sleeve fixedly arranged in the oil inlet of the oil return pipe, and a connecting hook fixedly connected to the mounting sleeve; the oil outlet end of the oil return pipe is connected to the unevenness measurement system; the mounting sleeve is connected to the oil return pipe to form a second oil hole, and the oil outlet end of the nozzle fixing assembly extends into the oil return pipe after passing through the mounting sleeve; the other end of the connecting hook is hooked on the first mounting plate.

[0013] Furthermore, the first end of the connecting hook is fixed to the mounting sleeve, and the second end of the connecting hook extends toward the first mounting plate relative to its first end while gradually tilting outward, and the tail of the second end of the connecting hook is bent inward to form a bayonet, which is used to clamp the outer edge of the first mounting plate.

[0014] Furthermore, a plurality of concave limiting holes which are arranged in sequence and spaced apart along the circumferential direction are provided on the upper surface of the first mounting plate; the tail of the second end of the connecting hook is inserted into the concave limiting hole at the corresponding position.

[0015] Furthermore, the central opening of the first mounting disk is arranged to form an annular disk; a plurality of mounting through holes and a plurality of limiting recessed holes are arranged in sequence and spaced apart along the circumference thereof.

[0016] According to another aspect of the present invention, a fuel manifold unevenness test device is provided, comprising the fuel manifold unevenness test transition section structure as described above.

[0017] The present invention has the following beneficial effects:

[0018] The fuel main pipe unevenness test transition section structure of the present invention is a split design, that is, it includes an independently arranged first mounting plate, a nozzle fixing assembly and an oil return pipe fitting, and the nozzle fixing assembly is detachably fixed to the first mounting plate, the nozzle is detachably connected to the nozzle fixing assembly through a fastening connector, the oil inlet end of the oil return pipe fitting is detachably connected to the first mounting plate, and the oil outlet end of the nozzle fixing assembly only extends into the oil inlet end of the corresponding oil return pipe fitting. The entire transition section structure is not connected and fixed by welding, so the overall adaptability and maintainability of the structure are good, and the nozzle and fuel main pipe assembly will not be delayed due to maintenance of the structure. The installation progress of the assembly is fast and the assembly is convenient. The first mounting plate, the nozzle fixing assembly and the oil return pipe can all be processed from aluminum to achieve the lightweight of the test transition section. On the other hand, since the transition section structure of the present invention is a split design, the first mounting plate, the nozzle fixing assembly and the oil return pipe can be used as universal parts. When the number of nozzles of different types and the fuel main pipe assembly is different, it is only necessary to replace the first mounting plate with the same number of mounting holes for installing the nozzle fixing assembly. This not only greatly improves the test efficiency and effectively reduces the test cost, but also expands the adaptability of the test device.

[0019] In addition to the above-described objects, features and advantages, the present invention has other objects, features and advantages. The present invention will be further described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings, which constitute part of this application, are intended to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are intended to explain the present invention and do not constitute an undue limitation of the present invention. In the accompanying drawings:

[0021] Figure 1 This is a schematic diagram of the existing integrated design of the nozzle fastening device Figure 1 ;

[0022] Figure 2 This is a schematic diagram of the existing integrated design of the nozzle fastening device Figure 2 ;

[0023] Figure 3 2. It is a schematic diagram of the spatial structure of a fuel main pipe unevenness test device according to a preferred embodiment of the present invention;

[0024] Figure 4 yes Figure 3 Schematic diagram of the disassembled fuel main pipe unevenness test device;

[0025] Figure 5 yes Figure 3 A schematic diagram of the top view of the nozzle fixing assembly;

[0026] Figure 6 yes Figure 5 AA-direction cross-sectional structural diagram;

[0027] Figure 7 yes Figure 3 A schematic diagram of the top view of the first mounting plate;

[0028] Figure 8 yes Figure 3 Schematic diagram of the main structure of the middle locking nut;

[0029] Figure 9 yes Figure 3 Schematic diagram of the cross-sectional main structure of the medium return oil pipe fitting.

[0030] Legend:

[0031] 1. First mounting plate; 101. Mounting through hole; 102. Card slot; 103. Position limiting recess;

[0032] 2. Nozzle fixing assembly; 201. First oil hole; 21. Second mounting plate; 211. Threaded through hole; 22. Oil guide rod; 23. Locking nut; 24. Positioning block;

[0033] 3. Oil return pipe; 301. Second oil hole; 31. Oil return pipe; 32. Mounting sleeve; 33. Connecting hook;

[0034] 4. Nozzle;

[0035] 5. Unevenness measurement system;

[0036] 6. Fuel main pipe. DETAILED DESCRIPTION

[0037] 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.

[0038] Reference Figure 3 and Figure 4 A preferred embodiment of the present invention provides a fuel manifold unevenness test adapter structure, comprising: a first mounting plate 1 serving as a mounting support, multiple nozzle fixing assemblies 2, and multiple oil return pipes 3. The number of nozzle fixing assemblies 2 and oil return pipes 3 corresponds to the number of nozzles 4 in the fuel manifold assembly. The multiple nozzle fixing assemblies 2 are sequentially spaced along the circumference of the first mounting plate 1, and each nozzle fixing assembly 2 is removably secured to the first mounting plate 1. Each nozzle fixing assembly 2 further defines a first oil hole 201 extending axially therethrough. The nozzles 4 are removably connected to the corresponding nozzle fixing assembly 2 via fastening members, thereby ensuring communication between the nozzles 4 and the corresponding first oil hole 201. Multiple groups of oil return pipes 3 are arranged in sequence along the circumference of the first mounting plate 1, and the oil inlet end of each oil return pipe 3 is detachably connected to the first mounting plate 1, and the oil outlet end of each oil return pipe 3 is connected to the unevenness measurement system 5. Each oil return pipe 3 also has a second oil hole 301 arranged along its length direction. The oil outlet end of the nozzle fixing assembly 2 extends into the oil inlet end of the corresponding oil return pipe 3, so that the first oil hole 201 is connected to the second oil hole 301.

[0039] When the fuel manifold unevenness test adapter structure of the present invention is in operation, the fuel first flows through the fuel manifold 6, then enters each nozzle 4 from the fuel manifold 6, and is then sprayed by the nozzle 4 into the first oil hole 201 of the connected nozzle fixing assembly 2, then enters the second oil hole 301 of the connected oil return pipe 3 from the first oil hole 201, and finally enters the unevenness measurement system 5 through the oil return pipe 3 for testing. Figure 3 shown.

[0040] The fuel main pipe unevenness test adapter section structure of the present invention is a split design, that is, it includes an independently arranged first mounting plate 1, a nozzle fixing assembly 2 and an oil return pipe 3, and the nozzle fixing assembly 2 is detachably fixed to the first mounting plate 1, the nozzle 4 is detachably connected to the nozzle fixing assembly 2 through a fastening connector, the oil inlet end of the oil return pipe 3 is detachably connected to the first mounting plate 1, and the oil outlet end of the nozzle fixing assembly 2 only extends into the oil inlet end of the corresponding oil return pipe 3. The entire adapter section structure is not connected and fixed by welding, so the overall adaptability and maintainability of the structure are good, and the nozzle and fuel main pipe will not be delayed due to maintenance of the structure. The installation progress of the assembly is fast and the assembly is convenient, and the first mounting plate 1, the nozzle fixing assembly 2 and the return oil pipe 3 can all be processed from aluminum to achieve lightweight testing of the transition section; on the other hand, since the transition section structure of the present invention is a split design, the first mounting plate 1, the nozzle fixing assembly 2 and the return oil pipe 3 can be used as universal parts. When the number of nozzles 4 of different types of nozzles and fuel main pipe assemblies is different, it is only necessary to replace the first mounting plate 1 with the same number of mounting holes for installing the nozzle fixing assembly 2, thereby greatly improving the test efficiency and effectively reducing the test cost, while expanding the adaptability of the test device.

[0041] Alternatively, as Figure 7 As shown, a plurality of mounting holes 101 are sequentially spaced apart on the circumference of the first mounting plate 1 and are arranged through the plate surface. Figure 5 、 Figure 6 and Figure 8 As shown, the nozzle fixing assembly 2 includes a second mounting plate 21, an oil guide rod 22 axially fixedly connected to the second mounting plate 21, and a locking nut 23. A first oil through hole 201 is provided axially through the second mounting plate 21 and the oil guide rod 22. The oil guide rod 22 is inserted into the corresponding mounting through hole 101, and an external thread is machined on the outer circumference of the oil guide rod 22. The locking nut 23 is threadedly connected to the outer circumference of the oil guide rod 22. The second mounting plate 21 is provided with a threaded through hole 211 extending through the plate surface. The nozzle 4 is detachably fixed to the second mounting plate 21 by a fastening member inserted between the second mounting plate 21 and the threaded through hole 211. The second mounting plate 21 is pressed and fixed to the first mounting plate 1 by the action of the oil guide rod 22 and the locking nut 23. In this optional solution, the fastening member is a connecting screw, and the nozzle 4 is detachably fixed to the nozzle fixing assembly 2 by the threaded connection between the connecting screw and the threaded through hole 211. When installing the nozzle fixing assembly 2, first, the oil guide rod 22 is passed through the mounting through hole 101 from one side of the first mounting plate 1, and then the locking nut 23 is installed on the outer circle of the oil guide rod 22 from the other side of the first mounting plate 1. At the same time, the locking nut 23 is screwed to make the oil guide rod 22 pull the second mounting plate 21 so that the second mounting plate 21 is close to the upper surface of the first mounting plate 1, that is, the nozzle fixing assembly 2 is installed and fixed on the first mounting plate 1.

[0042] Furthermore, if Figure 5-7 As shown, the nozzle fixing assembly 2 also includes a positioning block 24 connected to the connection between the second mounting plate 21 and the oil guide rod 22. The wall of the mounting through hole 101 is also provided with a recessed slot 102 to accommodate the positioning block 24. When the oil guide rod 22 is inserted into the mounting through hole 101, the positioning block 24 is engaged with the slot 102 to limit the circumferential rotation of the oil guide rod 22 under force. During installation, when the oil guide rod 22 is inserted into the mounting through hole 101, the positioning block 24 is simultaneously engaged with the slot 102. When the locking nut 23 is then rotated, the cooperation between the positioning block 24 and the slot 102 effectively prevents the oil guide rod 22 and the second mounting plate 21 from rotating in the circumferential direction, making it easier to tighten the locking nut 23. At the same time, the threaded through hole 211 provided on the second mounting plate 21 is prevented from misaligning with the corresponding mounting hole on the nozzle 4, thereby reducing the difficulty of installing and fixing the nozzle 4 and improving assembly accuracy.

[0043] Preferably, if Figure 5-7 As shown, each group of nozzles 4 is fixed to the second mounting plate 21 by two symmetrically arranged groups of fasteners. The number of threaded through holes 211 is even, and every two threaded through holes 211 are combined into a group, and the two threaded through holes 211 in each group are symmetrically arranged about the center of the second mounting plate 21. In this preferred embodiment, since there are two symmetrically arranged mounting holes on the nozzle 4, the number of threaded through holes 211 is designed to be an even number, generally (4 to 8), and every two threaded through holes 211 are combined into a group, and the two threaded through holes 211 in each group are symmetrically arranged about the center of the second mounting plate 21; when the threaded through holes 211 on the transition section structure of the present invention are damaged due to repeated disassembly and assembly of the fastening screws, they can be rotated by a certain angle, and the remaining threaded through holes 211 can be used to install the fastening screws until the threaded through holes 211 on the second mounting plate 21 can no longer fasten the nozzle 4, and then the nozzle fixing assembly 2 can be replaced with a new one and continued to be used, so that the split fuel main pipe unevenness test transition section structure of the present invention has high maintainability and long service life; and the structure of the present invention has been used on a certain engine, and thousands of fuel main pipe unevenness tests have been completed so far, and the nozzle fixing assembly 2 has not been replaced with a new one, and it is still in use.

[0044] Preferably, if Figure 5 and Figure 7As shown, the number of positioning blocks 24 is equal to the number of threaded through holes 211, and the plurality of positioning blocks 24 are staggered in sequence with the plurality of threaded through holes 211 along the circumferential direction. The number of slots 102 is equal to the number of positioning blocks 24, and a plurality of slots 102 are sequentially arranged along the circumference of the mounting through hole 101 and are respectively connected to the mounting through hole 101. In this preferred embodiment, since there is a certain installation angle restriction between the nozzle 4 and the second mounting disk 21, when the second mounting disk 21 is rotated to replace the new threaded through hole 211 to dock with the mounting hole on the nozzle 4, in order to position the rotated second mounting disk 21, the number of positioning blocks 24 is equal to the number of threaded through holes 211, and the plurality of positioning blocks 24 are staggered in sequence with the plurality of threaded through holes 211 along the circumferential direction, thereby meeting the need for rotating and replacing the threaded through hole 211.

[0045] Alternatively, as Figure 3 and Figure 9 As shown, the oil return pipe fitting 3 includes a hollow oil return pipe 31, a mounting sleeve 32 fixedly arranged in the oil inlet of the oil return pipe 31, and a connecting hook 33 fixedly connected to the mounting sleeve 32. The oil outlet end of the oil return pipe 31 is connected to the unevenness measurement system 5. The mounting sleeve 32 is connected to the oil return pipe 31 to form a second oil through hole 301, and the oil outlet end of the nozzle fixing assembly 2 extends into the oil return pipe 31 after passing through the mounting sleeve 32. The other end of the connecting hook 33 is hooked on the first mounting plate 1. In this optional solution, the oil return pipe 31 is used to connect to the unevenness measurement system and is hooked on the first mounting plate 1 through the connecting hook 33, thereby simplifying installation and disassembly. At the same time, the oil return pipe fitting 3 is designed with a connecting hook 33, and the connecting hook 33 is hooked on the first mounting plate 1, which solves the problem that the rubber oil return pipe 31 hardens in winter and is difficult to assemble, thereby improving the assembly efficiency of the oil return pipe 31.

[0046] Preferably, if Figure 9 As shown, the first end of the connecting hook 33 is fixed to the mounting sleeve 32. The second end of the connecting hook 33 extends toward the first mounting plate 1 relative to the first end while gradually tilting outward. The tail of the second end of the connecting hook 33 is bent inward to form a snap fit for gripping the outer edge of the first mounting plate 1. In this preferred embodiment, this structural arrangement of the connecting hook 33 facilitates its stable hooking and connection to the first mounting plate 1.

[0047] Further, if Figure 7 and Figure 9 As shown, the upper surface of the first mounting plate 1 is further provided with a plurality of inwardly concave retaining holes 103 spaced circumferentially. The tail of the second end of the connecting hook 33 snaps into the corresponding retaining hole 103, further securing the oil return pipe 3 in its hooked connection to the first mounting plate 1 and facilitating its removal.

[0048] Alternatively, as Figure 7 As shown, the central opening of the first mounting plate 1 forms an annular disk. Multiple mounting through-holes 101 and multiple position-limiting recesses 103 are spaced apart along its circumference. In this alternative solution, the opening of the first mounting plate 1 effectively reduces the weight of the first mounting plate 1, thereby reducing the weight of the entire transition section structure, facilitating installation and setup.

[0049] Reference Figure 3 According to another aspect of the present invention, a fuel manifold unevenness test device is provided, comprising a fuel manifold unevenness test transition section structure as described above. The fuel manifold unevenness test device of the present invention has good overall adaptability and maintainability, and the installation progress of the nozzle and fuel manifold assembly will not be delayed due to the maintenance of the transition section structure. At the same time, the assembly is convenient. At the same time, since the transition section structure is a split design, the first mounting plate 1, the nozzle fixing assembly 2 and the oil return pipe 3 can be used as universal parts. When the number of nozzles 4 of different types of nozzles and fuel manifold assemblies is different, it is only necessary to replace the first mounting plate 1 with the same number of mounting holes for installing the nozzle fixing assembly 2. This not only greatly improves the test efficiency and effectively reduces the test cost, but also expands the adaptability of the test device.

[0050] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. A fuel main pipe unevenness test transition section structure, characterized in that: include: A first mounting plate (1) serving as a mounting support, a plurality of nozzle fixing assemblies (2) and a plurality of oil return pipes (3), wherein the number of the nozzle fixing assemblies (2) and the number of the oil return pipes (3) respectively correspond to the number of nozzles (4) in the nozzle and fuel main pipe assembly; A plurality of nozzle fixing assemblies (2) are sequentially spaced along the circumference of the first mounting plate (1), and each nozzle fixing assembly (2) is detachably fixed to the first mounting plate (1). A first oil hole (201) extending through the axial direction is further provided in each nozzle fixing assembly (2). The nozzle (4) is detachably connected to the corresponding nozzle fixing assembly (2) via a fastening connector, so that the nozzle (4) communicates with the corresponding first oil hole (201). A plurality of groups of oil return pipes (3) are sequentially spaced along the circumference of the first mounting plate (1), and the oil inlet end of each oil return pipe (3) is detachably connected to the first mounting plate (1). The oil outlet end of each oil return pipe (3) is connected to the unevenness measurement system (5). Each oil return pipe (3) also has a second oil hole (301) extending through the length thereof. The oil outlet end of the nozzle fixing assembly (2) extends into the oil inlet end of the corresponding oil return pipe (3), so that the first oil hole (201) is connected to the second oil hole (301).

2. The fuel manifold unevenness test transition section structure according to claim 1, characterized in that: A plurality of mounting through holes (101) penetrating the plate surface are sequentially spaced apart in the circumferential direction of the first mounting plate (1); The nozzle fixing assembly (2) comprises a second mounting plate (21), an oil guide rod (22) fixedly connected to the second mounting plate (21) in the axial direction, and a locking nut (23); a first oil through hole (201) is provided axially through the second mounting plate (21) and the oil guide rod (22); The oil guide rod (22) is inserted into the corresponding mounting through hole (101), and an external thread is processed on the outer circle of the oil guide rod (22), and the locking nut (23) is threadedly connected to the outer circle of the oil guide rod (22); The second mounting plate (21) is provided with a threaded through hole (211) penetrating the plate surface. The nozzle (4) is detachably fixed to the second mounting plate (21) via a fastening connector penetrating the nozzle (4) and the threaded through hole (211). The second mounting plate (21) is pressed and fixed to the first mounting plate (1) under the action of an oil guide rod (22) and a locking nut (23).

3. The fuel main pipe unevenness test transition section structure according to claim 2, characterized in that: The nozzle fixing assembly (2) further includes a positioning block (24) connected to the connection between the second mounting plate (21) and the oil guide rod (22); The hole wall of the installation through hole (101) is further provided with a recessed slot (102) for accommodating the positioning block (24), so that when the oil guide rod (22) is inserted into the installation through hole (101), the positioning block (24) is engaged in the slot (102) to limit the oil guide rod (22) from rotating in the circumferential direction under load.

4. The fuel main pipe unevenness test transition section structure according to claim 3, characterized in that: Each group of nozzles (4) is fixed to the second mounting plate (21) via two groups of symmetrically arranged fastening connectors; The number of the threaded through holes (211) is an even number, and every two threaded through holes (211) are combined into a group, and the two threaded through holes (211) in each group are symmetrically arranged about the center of the second mounting plate (21).

5. The fuel main pipe unevenness test transition section structure according to claim 4, characterized in that: The number of the positioning blocks (24) is equal to the number of the threaded through holes (211), and the plurality of positioning blocks (24) and the plurality of threaded through holes (211) are alternately arranged in the circumferential direction; The number of the card slots (102) is equal to the number of the positioning blocks (24), and the plurality of card slots (102) are sequentially arranged along the circumference of the mounting through hole (101) and are respectively communicated with the mounting through hole (101).

6. The fuel manifold unevenness test transition section structure according to claim 2, characterized in that: The oil return pipe member (3) comprises a hollow oil return pipe (31), a mounting sleeve (32) fixedly arranged in the oil inlet of the oil return pipe (31), and a connecting hook (33) fixedly connected to the mounting sleeve (32); The oil outlet end of the oil return pipe (31) is connected to the unevenness measuring system (5); The mounting sleeve (32) is connected to the oil return pipe (31) to form a second oil hole (301), and the oil outlet end of the nozzle fixing assembly (2) extends into the oil return pipe (31) after passing through the mounting sleeve (32); The other end of the connecting hook (33) is hooked on the first mounting plate (1).

7. The fuel main pipe unevenness test transition section structure according to claim 6, characterized in that: The first end of the connecting hook (33) is fixed to the mounting sleeve (32), and the second end of the connecting hook (33) extends toward the first mounting plate (1) relative to the first end thereof while gradually tilting outward, and the tail of the second end of the connecting hook (33) is bent inward to form a bayonet, which is used to clamp the outer edge of the first mounting plate (1).

8. The fuel manifold unevenness test transition section structure according to claim 7, characterized in that: The upper surface of the first mounting plate (1) is also provided with a plurality of concave limiting holes (103) which are sequentially spaced and arranged along the circumferential direction; The tail of the second end of the connecting hook (33) is snapped into the limiting recess (103) at the corresponding position.

9. The fuel main pipe unevenness test transition section structure according to claim 8, characterized in that: The central opening of the first mounting plate (1) is arranged so as to form an annular plate; A plurality of mounting through holes (101) and a plurality of limiting recessed holes (103) are respectively arranged in sequence and spaced apart along the circumference thereof.

10. A fuel main pipe unevenness test device, characterized in that: It comprises the fuel main pipe unevenness test transition section structure as described in any one of claims 1 to 9.

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