Fuel rail seal test apparatus and method with nozzle

Abstract

The present application relates to the technical field of aero-engine nozzle-equipped fuel manifold detection, and specifically relates to a nozzle-equipped fuel manifold sealing test device and method, comprising an adapter disc, a test tube and a plurality of nozzle connecting tubes; the first oil inlet pipe and the second oil inlet pipe on the adapter disc are respectively connected with a test device and a fuel manifold, so that, during testing, the nozzle connecting tubes are connected with each nozzle on the fuel manifold, and test liquid is delivered to the oil outlet of each nozzle on the fuel manifold; at the same time, the test liquid is injected into the fuel manifold through the second oil inlet pipe and the fuel manifold oil inlet pipe, and is then delivered to the oil inlet of each nozzle, so that the nozzles realize bidirectional oil inlet and oil pressure balance on both sides, the internal spring force balance is guaranteed, the sealing characteristic test of the fuel manifold is realized, the structural reliability is guaranteed, and actual test requirements are met.

Description

Technical Field

[0001] This invention relates to the field of aircraft engine fuel manifold testing technology, specifically to a fuel manifold sealing test device and method with nozzles. Background Technology

[0002] To accommodate the wide dynamic range of aero engines, aviation fuel nozzles are equipped with throttle valves, which are fitted with helical compression springs.

[0003] After testing the flow characteristics of the fuel manifold with nozzles, it is necessary to assess the sealing characteristics of each connection to ensure safety. The pressure during the test of the fuel manifold with nozzles is relatively high, much higher than the pressure during the nozzle test, generally 1.5 to 2 times the maximum working pressure of the nozzle, reaching over 10 MPa. If the sealing characteristics of the fuel manifold with nozzles are tested using the usual method, with fuel only entering through the inlet, the throttle valve spring inside the nozzle will be compressed to its limit—causing the throttle valve spring to completely close. If it remains in this state for a long time, the spring may fail, leading to throttle valve failure, and further causing nozzle failure and scrapping. Therefore, the existing testing method cannot meet the testing requirements. Summary of the Invention

[0004] The purpose of this invention is to provide a fuel manifold sealing test device and method with nozzles, which solves the technical problem that existing methods of conducting fuel manifold sealing tests with nozzles are prone to damaging the nozzles.

[0005] The solution of the present invention to the above-mentioned technical problems is as follows: A fuel mains sealing test device with nozzles includes an adapter plate, a test tube, and multiple nozzle connecting tubes. The multiple nozzle connecting tubes are arranged circumferentially around the axis of the adapter plate. The adapter plate is provided with a first fuel inlet pipe and a second fuel inlet pipe. The multiple nozzle connecting tubes are all connected to the first fuel inlet pipe. The test tube is connected to any of the nozzle connecting tubes through the second fuel inlet pipe.

[0006] Furthermore, the adapter plate is also provided with multiple horizontal pipes, which are circumferentially spaced around the axis of the first oil inlet pipe and are all connected to the first oil inlet pipe. The test pipe is connected to any of the horizontal pipes through the second oil inlet pipe. The horizontal pipes are connected to the nozzle connecting pipes one by one.

[0007] Further defined, the horizontal pipeline is arranged along the radial direction of the adapter plate, and multiple horizontal pipelines are stacked along the thickness direction of the adapter plate, with the first oil inlet pipe coaxial with the adapter plate.

[0008] Further specified, the number of horizontal pipes is 24, and two layers of horizontal pipes are arranged along the thickness direction of the adapter plate, with each layer containing 12 horizontal pipes.

[0009] Furthermore, the nozzle connecting pipe is provided with a nozzle connector at its end, which is used for detachable connection with the nozzle.

[0010] Further specified, the nozzle connector includes a connecting support, a nozzle connector, a connecting buckle, and a locking element; One end of the connecting support is detachably connected to the connecting buckle, and the other end of the connecting support is movably connected to the locking member. A sliding cavity is provided inside the connecting support, and a sliding groove is provided on the connecting support. The nozzle connecting end of the nozzle connector extends through the sliding groove to the sliding cavity. The nozzle connecting end is located between the locking member and the connecting buckle. The connecting tube end of the nozzle connector is located outside the connecting support and is connected to the corresponding end of the nozzle connecting tube.

[0011] Further defined, the sliding cavity is opened along the axial direction of the connecting support, the nozzle connector is an L-shaped structure, the side wall of the nozzle connector contacts the inner wall of the sliding groove, the locking member is threadedly connected to the connecting support, the contact end of the locking member extends to the sliding cavity and contacts the nozzle connector, and the nozzle connection end faces away from the contact end of the locking member.

[0012] Further specified, the bottom of the connecting buckle is threadedly connected to the connecting support, and a limiting cavity is formed on the connecting buckle. One end of the limiting cavity is connected to the sliding cavity and is directly opposite to the nozzle connection end, while the other end of the limiting cavity faces the outside of the connecting buckle.

[0013] Further, the nozzle connector has a sealing ring groove on the nozzle connection end; the connecting support also has an observation groove, which communicates with the sliding cavity.

[0014] A method for testing the sealing of a fuel manifold with a nozzle, based on the aforementioned fuel manifold sealing test apparatus with a nozzle, includes the following steps: Complete the commissioning of the fuel mains sealing test device with nozzles; Connect one end of the test tube to the second fuel inlet pipe, and connect the other end of the test tube to the fuel main pipe through the fuel inlet pipe. Connect the end of each nozzle connecting pipe to the oil outlet of the corresponding nozzle; Connect the output of the test equipment to the first oil inlet pipe; Start the testing equipment. At the same time, the test fluid is delivered to the nozzle outlet through the nozzle connecting pipe, and the test fluid is injected into the fuel main pipe through the second oil pipe and then delivered to the nozzle inlet.

[0015] The beneficial effects of this invention are as follows: 1. This invention connects the first and second oil inlet pipes on the adapter plate to the testing equipment and the fuel main pipe, respectively. During testing, the nozzle connecting pipe is connected to each nozzle to deliver the test fluid to the outlet of each nozzle. Simultaneously, the test fluid is injected into the fuel main pipe through any nozzle connecting pipe via the second oil inlet pipe and the oil inlet pipe, and then delivered to the inlet of the nozzle main pipe. This achieves bidirectional oil intake at the nozzles and balances the oil pressure on both sides, ensuring the internal spring is under balanced force while testing the sealing characteristics of the fuel main pipe, ensuring structural reliability, and meeting actual testing requirements.

[0016] 2. The present invention has a simple overall structure, low cost, and is easy to use. It can meet the sealing test of the fuel main pipe of different specifications of nozzles. By stacking multiple horizontal pipes, the difficulty of opening horizontal pipes in the adapter plate can be reduced. At the same time, the nozzle connector can be easily and quickly disassembled and assembled with the nozzle, improving the work efficiency. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the fuel main with nozzles according to the present invention; Figure 2 This is a structural diagram of the fuel main pipe sealing test device with nozzle of the present invention; Figure 3 for Figure 2 Cross-sectional view along the AA direction; Figure 4 This is a schematic diagram of the nozzle connector and nozzle connection according to the present invention; Figure 5 This is a cross-sectional view of the connecting support of the present invention; Figure 6 for Figure 5 Cross-sectional view along the BB direction; Figure 7 This is a cross-sectional view of the connecting buckle of the present invention; Figure 8 This is a cross-sectional view of the nozzle connector of the present invention.

[0018] In the diagram, 10-adapter plate; 11-first fuel inlet pipe; 12-second fuel inlet pipe; 13-horizontal pipeline; 20-nozzle connection pipe; 30-test pipe; 40-connecting support; 41-slide groove; 42-observation groove; 50-nozzle connector; 51-nozzle connection end; 52-connecting pipe end; 53-sealing ring groove; 60-connecting buckle; 61-limiting cavity; 70-locking element; 80-fuel main pipe; 81-fuel inlet pipe; 82-nozzle. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0020] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0021] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0022] In the description of the embodiments of the present invention, it should be noted that if terms such as "upper," "lower," "horizontal," or "inner" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of the invention is in use, they are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. Furthermore, terms such as "first" and "second" are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0023] Among them, reference Figure 1 The fuel main pipe 80 has a circular structure. An inlet pipe 81 is connected to the outside of the fuel main pipe 80. Multiple nozzles 82 are arranged at intervals along the radial direction of the inner ring of the fuel main pipe 80. The inlet of the nozzle 82 is connected to the inside of the fuel main pipe 80, and the outlet of the nozzle 82 is located on the outside of the fuel main pipe 80.

[0024] Example 1 refer to Figure 2 and Figure 3This invention provides a fuel mains sealing test device with nozzles, including an adapter plate 10, a test tube 30, and multiple nozzle connecting pipes 20. The adapter plate 10 serves as a connecting base. The output end of each nozzle connecting pipe 20 is connected to the oil outlet of a nozzle 82. Multiple nozzle connecting pipes 20 are circumferentially spaced around the axis of the adapter plate 10. A first oil inlet pipe 11 and a second oil inlet pipe 12 are provided inside the adapter plate 10. The input ends of all nozzle connecting pipes 20 are connected to the first oil inlet pipe 11, allowing test fluid to be injected into each nozzle connecting pipe 20 through the first oil inlet pipe 11 and then delivered to the oil outlet of the corresponding nozzle 82. Pressurized fluid is injected from the outside of the nozzle 82. The oil is supplied through the second inlet pipe 12, which is connected to any nozzle connection pipe 20 via the test pipe 30. The test pipe 30 is connected to the fuel main pipe 80 via the inlet pipe 81, allowing the test fluid to be injected into the fuel main pipe 80 after passing through both the test pipe 30 and the inlet pipe 81. Pressurized oil is injected into the inside of all nozzles 82. Since the test fluid on both the inside and outside of the nozzle 82 is fed into the nozzle connection pipe 20 from the first inlet pipe 11, the pressure of the test fluid on both the inside and outside of the nozzle 82 is balanced. This achieves the sealing test of the fuel main pipe with nozzles while avoiding the nozzle 82 being pressurized on one side, which would reduce its service life or cause damage, thus meeting the actual sealing test and actual use requirements.

[0025] Optionally, the output end of the nozzle connecting pipe 20 has a Y-shaped structure, which can be connected to the oil outlet of two nozzles 82 at the same time; preferably, the number of nozzle connecting pipes 20 is the same as the number of nozzles 82 on the fuel main pipe 80, so that the nozzle connecting pipe 20 can be connected to the nozzles 82 one by one; taking 24 nozzles 82 as an example, the number of nozzle connecting pipes 20 is also 24.

[0026] Specifically, the output end of the first oil inlet pipe 11 can be connected to the corresponding nozzle connecting pipe 20 via an adapter. To facilitate connection and accommodate the connection requirements of different numbers of nozzles 82, the adapter plate 10 preferably also has multiple horizontal pipes 13. The multiple horizontal pipes 13 are arranged circumferentially around the axis of the first oil inlet pipe 11. The input ends of the multiple horizontal pipes 13 are all connected to the output end of the first oil inlet pipe 11, and the output ends of the horizontal pipes 13 extend to the outside of the adapter plate 10 for detachment and connection with the input end of the nozzle connecting pipe 20. The number of horizontal pipes 13 is not less than the number of nozzle connecting pipes 20. In use, the horizontal pipes 13 are connected to the nozzle connecting pipes 20 one by one. The output ends of the horizontal pipes 13 that are not connected to the nozzle connecting pipes 20 can be sealed by a seal. Preferably, the number of horizontal pipes 13 is the same as the number of nozzle connecting pipes 20.

[0027] At this time, the test tube 30 is connected to any horizontal pipe 13 through the second oil inlet pipe 12. When the number of horizontal pipes 13 is greater than the number of nozzle connection pipes 20, the horizontal pipes 13 connected to the second oil inlet pipe 12 can be marked. When using it, it is necessary to ensure that the horizontal pipe 13 is connected to the nozzle connection pipe 20 to avoid blocking the horizontal pipe 13 and affecting the injection of test fluid into the fuel main pipe 80.

[0028] To further explain, in order to avoid increasing the processing difficulty of the first oil inlet pipe 11 in the adapter plate 10 by laying too many horizontal pipes 13, it is preferable to stack multiple horizontal pipes 13 along the height direction of the adapter plate 10. Taking two layers as an example, each layer is provided with 12 horizontal pipes 13. The first oil inlet pipe 11 is set along the axis of the adapter plate 10. The horizontal pipes 13 in each layer are connected to the first oil inlet pipe 11. The second oil inlet pipe 12 is set along the thickness direction of the adapter plate 10 and is connected to any of the outermost horizontal pipes 13.

[0029] Example 2 Based on Embodiment 1, this embodiment provides a fuel main pipe sealing test device with a nozzle. The output end of the nozzle connecting pipe 20 is provided with a nozzle connector, which is used to detach and connect with the nozzle 82, so as to facilitate quick assembly and disassembly of the nozzle 82 during the sealing test.

[0030] refer to Figures 4-8 The nozzle connector includes a connecting support 40, a nozzle connector 50, a connecting buckle 60, and a locking element 70.

[0031] Specifically, the connecting support 40 can be a cylindrical structure with an outer diameter of 45mm and a height of 90mm. A sliding cavity is provided inside the connecting support 40 along its axial direction. The nozzle snap-fit ​​end of the connecting support 40 is detachably connected to the connecting buckle 60. The bottom end of the connecting buckle 60 extends into the sliding cavity. The other end of the connecting support 40 is movably connected to the locking member 70. The contact end of the locking member 70 extends into the sliding cavity. A groove 41 is provided on the circumferential surface of the connecting support 40. The groove 41 is opened along the length direction of the connecting support 40 and has a width of 22mm. The nozzle connection end 51 of the nozzle connector 50 extends through the groove 41 into the sliding cavity, and the nozzle connection end 51 faces the connecting buckle 60. At this time, the nozzle connection end 51 is located between the locking member 70 and the connecting buckle 60. The connecting tube end 52 of the nozzle connector 50 is located outside the connecting support 40 and is connected to the output of the corresponding nozzle connecting tube 20.

[0032] The nozzle 82's outlet extends through the nozzle snap-fit ​​end of the connecting support 40 into the sliding cavity. The connecting buckle 60 is used to snap and limit the nozzle 82 on the connecting support 40. The nozzle connecting end 51 slides along the length of the sliding cavity to communicate with the outlet of the nozzle 82. Finally, the locking member 70 is adjusted to limit the nozzle connecting end 51, thereby ensuring that the nozzle connecting end 51 and the outlet of the nozzle 82 are tightly connected. An oil injection channel is provided in the nozzle connector 50, which is located between the nozzle connecting end 51 and the connecting pipe end 52. This allows the test liquid input from the nozzle connecting pipe 20 to flow from the connecting pipe end 52 through the oil injection channel and the nozzle connecting end 51 to the outlet of the nozzle 82. To ensure the sealing of the connection between the nozzle connecting end 51 and the outlet of the nozzle 82, a sealing ring groove 53 is preferably provided on the nozzle connecting end 51.

[0033] Preferably, the nozzle connector 50 has an L-shaped structure, with the nozzle connection end 51 parallel to the axis of the connecting support 40, the connecting pipe end 52 perpendicularly connected to the axis of the support 40, the side wall of the nozzle connector 50 in contact with the inner wall of the slide groove 41, and the nozzle connector 50 being able to slide along the slide groove 41 in the sliding cavity to approach or move away from the connecting buckle 60.

[0034] The connecting buckle 60 can be a cylindrical structure. The nozzle engaging end of the connecting support 40 is provided with a nozzle engaging hole. The connecting buckle 60 is threadedly connected to the nozzle engaging hole. A limiting cavity 61 is provided inside the connecting buckle 60. A nozzle inlet groove is provided on the side wall of the connecting buckle 60. A nozzle outlet hole is provided at the bottom of the connecting buckle 60. Both the nozzle inlet groove and the nozzle outlet hole are connected to the limiting cavity 61. In use, the oil outlet of the nozzle 82 passes through the limiting cavity 61 from the nozzle inlet groove and then through the nozzle outlet hole. Then, the bottom end of the connecting buckle 60 is engaged with the nozzle engaging hole, and the connecting support 40 is rotated and tightened. The oil outlet of the nozzle 82 faces the nozzle connecting end 51. Preferably, an anti-slip layer is provided on the top of the connecting buckle 60. In use, the anti-slip teeth can be used to directly rotate the connecting buckle 60 and tighten it with the connecting support 40.

[0035] Then, manually push the nozzle connector 50 to slide close to the oil outlet of the nozzle 82 until the nozzle connection end 51 contacts the oil outlet of the nozzle 82. Finally, use the locking member 70 to further push the nozzle connection end 51 to contact the oil outlet of the nozzle 82. The sealing ring groove 53 ensures reliable connection sealing. Then, the test equipment can be started to conduct a sealing test. In order to facilitate observation of whether there is leakage during the sealing test, it is preferable to open an observation groove 42 on the circumferential side wall of the connecting support 40. The length of the observation groove 42 can be selected as 65mm and the width as 16mm. The observation groove 42 is connected to the sliding cavity for easy observation.

[0036] The locking element 70 can be screwed to the connecting support 40. The locking element 70 can be a nut. The contact end of the locking element 70 extends into the sliding cavity and contacts the nozzle connector 50 to limit the nozzle connector 50 and ensure a stable and reliable connection with the oil outlet of the nozzle 82.

[0037] Example 3 Based on the fuel manifold sealing test apparatus with nozzle provided in Embodiment 1 or Embodiment 2, this embodiment provides a fuel manifold sealing test method with nozzle, including the following steps: Complete the commissioning of the fuel mains sealing test device with nozzles; Connect one end of the test tube 30 to the second oil inlet pipe 12, and connect the other end of the test tube 30 to the fuel main pipe 80 through the oil inlet pipe 81. Connect the end of each nozzle connecting pipe 20 to the oil outlet of the corresponding nozzle 82; Connect the output of the test equipment to the first oil inlet pipe 11; When the test equipment is started, the test fluid is delivered to the outlet of the nozzle 82 through the nozzle connecting pipe 20. At the same time, the test fluid is injected into the fuel main pipe 80 through the fuel inlet pipe 81 along the second oil pipe 12 and then delivered to the inlet of the nozzle 82.

[0038] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the scope of the invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0039] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can be appropriately combined to form other embodiments that can be understood by those skilled in the art. The above content is only for illustrating the technical concept of the present invention and should not be construed as limiting the scope of protection of the present invention. Any modifications made based on the technical concept proposed in this invention shall fall within the scope of protection of the claims of this invention.

[0040] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A fuel mains sealing test device with a nozzle, characterized in that, It includes a converter plate (10), a test tube (30) and multiple nozzle connecting tubes (20). The multiple nozzle connecting tubes (20) are arranged circumferentially around the axis of the converter plate (10). The converter plate (10) is provided with a first oil inlet pipe (11) and a second oil inlet pipe (12). The multiple nozzle connecting tubes (20) are all connected to the first oil inlet pipe (11). The test tube (30) is connected to any nozzle connecting tube (20) through the second oil inlet pipe (12).

2. The fuel mains sealing test device with nozzle according to claim 1, characterized in that, The adapter plate (10) is also provided with multiple horizontal pipes (13). The multiple horizontal pipes (13) are arranged circumferentially around the axis of the first oil inlet pipe (11) and are all connected to the first oil inlet pipe (11). The test pipe (30) is connected to any horizontal pipe (13) through the second oil inlet pipe (12). The horizontal pipe (13) is connected to the nozzle connecting pipe (20) in a one-to-one correspondence.

3. The fuel mains sealing test device with nozzle according to claim 2, characterized in that, The horizontal pipeline (13) is arranged in the radial direction of the adapter plate (10), and multiple horizontal pipelines (13) are stacked in the thickness direction of the adapter plate (10). The first oil inlet pipe (11) is coaxially arranged with the adapter plate (10).

4. The fuel mains sealing test device with nozzle according to claim 3, characterized in that, The number of horizontal pipes (13) is 24. Two layers of horizontal pipes (13) are arranged along the thickness direction of the adapter plate (10), and the number of horizontal pipes (13) in each layer is 12.

5. The fuel mains sealing test device with nozzle according to claim 1, characterized in that, The nozzle connecting pipe (20) is provided with a nozzle connector at its end, which is used to detach and connect with the nozzle (82).

6. The fuel mains sealing test apparatus with nozzle according to claim 5, characterized in that, The nozzle connector includes a connecting support (40), a nozzle connector (50), a connecting buckle (60), and a locking element (70). One end of the connecting support (40) is detachably connected to the connecting buckle (60), and the other end of the connecting support (40) is movably connected to the locking member (70). A sliding cavity is provided inside the connecting support (40), and a sliding groove (41) is provided on the connecting support (40). The nozzle connection end (51) of the nozzle connector (50) extends through the sliding groove (41) to the sliding cavity. The nozzle connection end (51) is located between the locking member (70) and the connecting buckle (60). The connecting tube end (52) of the nozzle connector (50) is located outside the connecting support (40) and is connected to the corresponding end of the nozzle connecting tube (20).

7. The fuel mains sealing test apparatus with nozzle according to claim 6, characterized in that, The sliding cavity is opened along the axial direction of the connecting support (40). The nozzle connector (50) has an L-shaped structure. The side wall of the nozzle connector (50) contacts the inner wall of the slide groove (41). The locking member (70) is threadedly connected to the connecting support (40). The contact end of the locking member (70) extends to the sliding cavity and contacts the nozzle connector (50). The nozzle connection end (51) faces away from the contact end of the locking member (70).

8. The fuel mains sealing test apparatus with nozzle according to claim 7, characterized in that, The bottom of the connecting buckle (60) is threaded to the connecting support (40). A limiting cavity (61) is provided on the connecting buckle (60). One end of the limiting cavity (61) is connected to the sliding cavity and is directly opposite to the nozzle connecting end (51). The other end of the limiting cavity (61) faces the outside of the connecting buckle (60).

9. The fuel mains sealing test apparatus with nozzle according to claim 8, characterized in that, A sealing ring groove (53) is provided on the nozzle connection end (51) of the nozzle connector (50); an observation groove (43) is also provided on the connecting support (40), and the observation groove (42) is connected to the sliding cavity.

10. A method for testing the sealing of a fuel main with a nozzle, characterized in that, The fuel mains sealing test apparatus with nozzle according to any one of claims 1 to 9 includes the following steps: Complete the commissioning of the fuel mains sealing test device with nozzles; Connect one end of the test tube (30) to the second oil inlet pipe (12), and connect the other end of the test tube (30) to the fuel main pipe (80) through the oil inlet pipe (81); Connect the end of each nozzle connecting pipe (20) to the oil outlet of the corresponding nozzle (82); Connect the output end of the test equipment to the first oil inlet pipe (11); When the test equipment is started, the test fluid is delivered to the nozzle (82) outlet through the nozzle connecting pipe (20). At the same time, the test fluid is injected into the fuel main pipe (80) through the oil inlet pipe (81) along the second oil pipe (12) and then delivered to the oil inlet of the nozzle (82).

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