An aero-engine nozzle air tightness detection device and method

Abstract

This invention discloses an airtightness testing device and method for aero-engine fuel injectors. The invention relates to the field of aero-engine fuel injector technology and includes a worktable. A vertical plate is fixedly installed at the top edge of the worktable, and a top plate is fixedly installed on the top of the vertical plate. A positioning mechanism is fixedly installed on the top of the worktable, and a hydraulic cylinder is fixedly installed in the middle of the top of the top plate. A telescopic rod is fixedly connected to the telescopic end of the hydraulic cylinder, and a lifting seat is fixedly installed at the bottom end of the telescopic rod. A testing mechanism is fixedly installed at the bottom of the lifting seat. This airtightness testing device and method for aero-engine fuel injectors uses the positioning mechanism to center and clamp the fuel injector to be tested and seal its bottom. Combined with the testing mechanism, it achieves multi-station synchronous positioning, sealing, and testing, greatly improving testing efficiency. The positioning component can self-align and clamp, solving the problems of poor positioning accuracy and easy workpiece displacement caused by manual alignment in traditional testing equipment.

Description

Technical Field

[0001] This invention relates to the field of aviation fuel injector technology, specifically to an airtightness testing device and method for aviation engine fuel injectors. Background Technology

[0002] As a key component of the fuel supply system of an aero-engine, the fuel injector is mainly responsible for atomizing high-pressure fuel and injecting it into the combustion chamber. Its airtightness is the core indicator to ensure fuel injection pressure, atomization effect and combustion efficiency. If the fuel injector has airtightness defects, problems such as fuel leakage and insufficient injection pressure will occur, which will seriously affect the engine's working efficiency. However, the existing airtightness detection devices for aero-engine fuel injectors still have defects in actual use.

[0003] Traditional aero-engine fuel injector air tightness testing equipment mostly uses manual alignment, which not only has poor positioning accuracy but is also prone to problems such as fuel injector misalignment and tilting, resulting in loose sealing and affecting the accuracy of air tightness test results.

[0004] Furthermore, the sealing and testing components of traditional testing equipment are mostly rigid structures. During the docking process between the upper and lower seals and the fuel injector, there is a lack of buffer and protection structures. The seals are in hard contact with the fuel injector end face, which can easily cause wear on the fuel injector sealing end face. In addition, the sealing fit is insufficient, which can easily lead to leakage of the test gas, thus affecting the accuracy of the test data.

[0005] In addition, traditional aero-engine fuel injector air tightness testing equipment mostly adopts a single-station testing mode, which can only complete the sealing test of one fuel injector at a time. The testing efficiency is low and cannot meet the testing needs of mass production, thus affecting the production and processing efficiency of fuel injectors. Summary of the Invention

[0006] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a device for testing the air tightness of an aero-engine fuel injector, comprising:

[0007] A workbench is provided, with a vertical plate fixedly installed at the top edge of the workbench, a top plate fixedly installed on the top of the vertical plate, columns fixedly installed between the workbench and the four corners at the bottom of the top plate, a control panel fixedly installed on the outer surface of the workbench, the control panel being used to control the operation of the equipment, receive and display the detected pressure data, a support frame plate fixedly installed on the outer surface of the vertical plate, and legs fixedly installed at the four corners at the bottom of the workbench.

[0008] The positioning mechanism is fixedly installed on the top of the workbench. There are six positioning mechanisms, and the six positioning mechanisms are equally distributed on the top of the workbench. The positioning mechanism is used to center and clamp the fuel injector to be tested and seal the bottom, so as to realize multi-station synchronous positioning.

[0009] A hydraulic cylinder is fixedly installed at the middle of the top of the top plate. A telescopic rod is fixedly connected to the telescopic end of the hydraulic cylinder. The telescopic rod passes through the top plate and extends to its bottom. A lifting seat is fixedly installed at the bottom of the telescopic rod. A detection mechanism is fixedly installed at the bottom of the lifting seat. A column is used to provide guidance for the lifting and lowering of the detection mechanism. The hydraulic cylinder drives the telescopic rod to extend and retract, thereby driving the lifting seat to move up and down. The lifting seat drives the detection mechanism to lift and lower synchronously. The detection mechanism is used to seal the top of the fuel injector and perform air tightness testing.

[0010] The positioning mechanism includes a fixed plate, and a lower seal and a positioning element are installed on the top of the fixed plate. The lower seal is used to seal the bottom end of the fuel injector, and the positioning element is used to adaptively center and clamp the fuel injector workpiece.

[0011] The positioning component includes a guide rail, which is fixedly mounted on a fixed disk. The guide rail is evenly distributed along the axis of the fixed disk. A slide block is slidably mounted on the top of the guide rail. A vertical rod is fixedly mounted on the top of the slide block. An installation arc block is fixedly mounted on the top of the vertical rod. A roller is rotatably mounted on the inner curved surface of the installation arc block via a rotating shaft. A connecting spring is fixedly connected between adjacent installation arc blocks. The guide rail is used to limit the sliding direction of the slide block, ensuring that the slide block moves linearly in the radial direction, so that the clamping action of the installation arc block always remains in the same centered direction, achieving precise centering. The clamping force of the installation arc block in conjunction with the connecting spring adjusts the clamping radius according to the outer diameter of the workpiece to adapt to different specifications of fuel injector workpieces. The roller is used to reduce the friction between the workpiece and the installation arc block, avoiding scratches on the outer wall of the workpiece. At the same time, the roller guides the workpiece positioning through rolling contact, improving work efficiency.

[0012] Preferably, the lower sealing element includes a lower sealing cone block, which is used to fit against the bottom end of the fuel injector to achieve a bottom seal. The lower sealing cone block is located in the middle of the top of the fixed plate. A lower ring frame is fixedly installed at the bottom of the lower sealing cone block, and a support frame is fixedly installed on the outer surface of the lower ring frame. The support frame is fixedly installed on the top of the fixed plate. The lower ring frame and the support frame are used to fix and support the lower sealing cone block to ensure that the lower sealing cone block is installed stably.

[0013] Preferably, the support frames are evenly distributed along the axis of the lower ring frame, and the support frames are spaced apart from the guide rails to avoid mutual interference during component operation.

[0014] Preferably, the testing mechanism includes a slide, an upper seal, and a positive pressure chamber. The slide is slidably mounted on the outer surface of the column to ensure stable lifting and lowering of the entire testing mechanism. The upper seal is fixedly mounted on the inner side of the slide by a bracket and is used to seal the top of the fuel injector. An inflation pipe is fixedly connected between the upper seal and the positive pressure chamber. The positive pressure chamber is fixedly mounted on the top of the support plate and is used to provide high-pressure gas for testing. The inflation pipe is used to deliver the high-pressure gas to the inside of the workpiece.

[0015] Preferably, the upper sealing elements are evenly distributed inside the carriage, and the upper sealing elements are positioned directly above the positioning mechanism to ensure precise docking with the positioning mechanism.

[0016] Preferably, a pressure gauge is fixedly installed on the inflation tube. The pressure gauge is connected to the control panel via an electrical signal. The pressure gauge is used to monitor and detect the gas pressure in real time and transmit the pressure data to the control panel.

[0017] Preferably, the upper sealing element includes an upper sealing cone and an upper ring frame. The upper sealing cone is used to seal the top of the fuel injector. A ring cover is fixedly installed on the top of the upper sealing cone. An elastic support rod is rotatably installed on the outer surface of the ring cover via a rotating shaft. The other end of the elastic support rod is rotatably installed on the inner side of the upper ring frame via a rotating shaft. The elastic support rod is used to provide mating buffer to avoid wear on the end face of the workpiece and to ensure sealing fit. An air inlet is provided at the axial center of the upper sealing cone. The air inlet is used to introduce high-pressure gas into the fuel injector.

[0018] Preferably, the inflation tube is fixedly installed at the axis of the ring cover, and the inflation tube is connected to the inflation hole to ensure smooth gas delivery.

[0019] Preferably, the elastic struts are evenly distributed along the axis of the ring cover, and the elastic struts are inclinedly arranged on the outer surface of the ring cover to make the buffering and support forces more even.

[0020] An airtightness testing device for aircraft engine fuel injectors comprises the following steps:

[0021] S1. Place the fuel injector of the aircraft engine to be tested on the top of the positioning mechanism. The outer wall of the workpiece contacts the roller. The squeezing roller drives the mounting arc block, the upright and the slide to slide outward along the guide rail. The connecting spring is stretched to generate clamping force, realizing automatic centering and clamping of the workpiece. At the same time, the bottom end of the workpiece fits with the lower sealing cone of the lower sealing component to complete the bottom sealing of the workpiece.

[0022] S2. Start the hydraulic cylinder through the control panel. The hydraulic cylinder drives the telescopic rod to move the lifting seat and the detection mechanism together along the column, so that the upper seal of the detection mechanism is close to the top of the workpiece.

[0023] S3. The upper sealing cone contacts the top of the workpiece, compressing the elastic support rod to shrink and buffer. After the elastic support rod shrinks to the correct position, the upper sealing cone completely fits the top of the workpiece, thus achieving a seal at the top of the workpiece.

[0024] S4. Start the positive pressure chamber and inflate the workpiece with air through the air inlet of the air pipe and the air inlet of the upper sealing cone. The pressure gauge monitors the inflation pressure in real time and transmits the data to the control panel. The pressure value displayed on the control panel is used to determine whether the air tightness of the fuel injector is qualified.

[0025] This invention provides a device for testing the airtightness of fuel injectors in aircraft engines. It has the following advantages:

[0026] (I) The air tightness testing equipment for aero-engine fuel injectors, through the setting of the positioning mechanism, the installation arc block and the connecting spring cooperate, and the guide rail limits the radial linear sliding of the slide block, so that the positioning component can self-center and clamp, and keep the fuel injector workpiece in the positioning center position at all times, preventing positioning offset and tilting, improving positioning accuracy, and solving the problems of poor positioning accuracy and easy workpiece offset and tilting of traditional testing equipment by manual alignment.

[0027] (II) The air tightness testing equipment for aero-engine fuel injectors, through the setting of internal rollers in the positioning component, allows the rollers to roll and contact the outer wall of the fuel injector workpiece, which greatly reduces the friction between the workpiece and the clamping component, and avoids the outer wall of the workpiece being scratched. At the same time, with the flexible clamping force of the connecting spring, flexible positioning and clamping are achieved, which solves the problem that traditional equipment is prone to damaging the fuel injector workpiece.

[0028] (III) The air tightness testing equipment for aero-engine fuel injectors, through the setting of the upper sealing component, when the upper sealing cone block contacts the top of the fuel injector, the elastic support rod contracts under force to provide flexible buffer, avoiding wear caused by hard contact between the sealing component and the sealing end face of the workpiece. At the same time, the elastic support rod generates a reverse support force after contraction, making the upper sealing cone block fit more tightly with the top of the workpiece and the lower sealing cone block fit more tightly with the bottom of the workpiece, preventing the leakage of the test gas, ensuring accurate and reliable test data, and solving the problem of rigid docking and lack of buffer protection of traditional sealing components.

[0029] (iv) The air tightness testing equipment for aero-engine fuel injectors, through the cooperation of six equidistantly distributed positioning mechanisms and corresponding upper sealing components, realizes multi-station synchronous feeding, synchronous sealing and synchronous testing. A single process can complete the air tightness testing of six fuel injector workpieces, which greatly improves the testing efficiency, speeds up the workpiece production and processing progress, and solves the problem of low testing efficiency of traditional equipment.

[0030] (v) The air tightness testing equipment for the aero-engine fuel injector, through the setting of the pressure gauge and control panel, the pressure gauge collects the test gas pressure in the charging pipe in real time and transmits the data to the control panel synchronously. The operator can judge the air tightness of the workpiece through the pressure value, which improves the objectivity and accuracy of the test results. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0032] Figure 2 This is a schematic diagram of the appearance of the present invention;

[0033] Figure 3 This is a schematic diagram of the positioning mechanism structure of the present invention;

[0034] Figure 4 This is a schematic diagram of the lower sealing element structure of the present invention;

[0035] Figure 5 This is a schematic diagram of the positioning component structure of the present invention;

[0036] Figure 6 This is a schematic diagram of the detection mechanism of the present invention;

[0037] Figure 7 This is a diagram showing the positional relationship between the upper sealing element and the inflation tube in this invention;

[0038] Figure 8 This is a schematic diagram of the sealing structure of the present invention.

[0039] In the diagram: 1. Workbench; 2. Vertical plate; 3. Top plate; 4. Positioning mechanism; 41. Fixed plate; 42. Lower seal; 421. Lower sealing cone; 422. Lower ring frame; 423. Support frame; 43. Positioning component; 431. Guide rail; 432. Slide; 433. Vertical rod; 434. Mounting arc block; 435. Roller; 436. Connecting spring; 5. Hydraulic cylinder; 6. Telescopic rod; 7. Lifting seat; 8. Detection mechanism; 81. Slide; 82. Upper seal; 821. Upper sealing cone; 822. Ring cover; 823. Elastic support rod; 824. Upper ring frame; 825. Inflation port; 83. Positive pressure chamber; 84. Inflation pipe; 85. Pressure gauge; 9. Column; 10. Control panel; 11. Support plate; 12. Support leg. Detailed Implementation

[0040] To make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings.

[0041] Example 1, please refer to Figure 1-2 This invention provides a technical solution: a device for testing the air tightness of an aircraft engine fuel injector, comprising:

[0042] Workbench 1, with a vertical plate 2 fixedly installed at the top edge of the workbench 1, a top plate 3 fixedly installed on the top of the vertical plate 2, and columns 9 fixedly installed between the four corners of the bottom of the workbench 1 and the top plate 3. A control panel 10 is fixedly installed on the outer surface of the workbench 1. The control panel 10 is used to control the operation of the equipment, receive and display the detection pressure data. A support plate 11 is fixedly installed on the outer surface of the vertical plate 2, and legs 12 are fixedly installed at the four corners of the bottom of the workbench 1.

[0043] Positioning mechanism 4 is fixedly installed on the top of workbench 1. There are six positioning mechanisms 4, and the six positioning mechanisms 4 are equally distributed on the top of workbench 1. The positioning mechanism 4 is used to center and clamp the fuel injector to be tested and seal the bottom, so as to realize multi-station synchronous positioning.

[0044] Hydraulic cylinder 5 is fixedly installed in the middle of the top of top plate 3. The telescopic end of hydraulic cylinder 5 is fixedly connected to telescopic rod 6. Telescopic rod 6 passes through top plate 3 and extends to its bottom. Lifting seat 7 is fixedly installed at the bottom of telescopic rod 6. Detection mechanism 8 is fixedly installed at the bottom of lifting seat 7. Column 9 is used to provide guidance for the lifting and lowering of detection mechanism 8. Hydraulic cylinder 5 drives telescopic rod 6 to extend and retract, thereby driving lifting seat 7 to move up and down. Lifting seat 7 drives detection mechanism 8 to lift and lower synchronously. Detection mechanism 8 is used to seal the top of fuel injector and perform air tightness testing.

[0045] Example 2, based on Example 1, please refer to... Figure 3-5 As shown, the positioning mechanism 4 includes a fixed plate 41. A lower seal 42 and a positioning member 43 are installed on the top of the fixed plate 41. The lower seal 42 is used to seal the bottom end of the fuel injector, and the positioning member 43 is used to adaptively center and clamp the fuel injector workpiece.

[0046] The positioning component 43 includes a guide rail 431, which is fixedly mounted on a fixed disk 41. The guide rails 431 are evenly distributed along the axis of the fixed disk 41. A slide block 432 is slidably mounted on the top of the guide rail 431. A vertical rod 433 is fixedly mounted on the top of the slide block 432. An mounting arc block 434 is fixedly mounted on the top of the vertical rod 433. A roller 435 is rotatably mounted on the inner curved surface of the mounting arc block 434 via a rotating shaft. A connecting spring 436 is fixedly connected between adjacent mounting arc blocks 434. The guide rail 431 is used to limit the slide block. The sliding direction of 432 ensures that the slide block 432 moves linearly in the radial direction, so that the clamping action of the mounting arc block 434 always stays in the same centered direction, achieving precise centering. The clamping force of the mounting arc block 434 and the connecting spring 436 adjusts the clamping radius according to the outer diameter of the workpiece to adapt to different specifications of fuel injector workpieces. The roller 435 is used to reduce the friction between the workpiece and the mounting arc block 434 to avoid scratching the outer wall of the workpiece. At the same time, the roller 435 guides the workpiece positioning through rolling contact, improving work efficiency.

[0047] The lower seal 42 includes a lower sealing cone 421, which is used to fit against the bottom end of the fuel injector to achieve a bottom seal. The lower sealing cone 421 is located in the middle of the top of the fixed plate 41. A lower ring frame 422 is fixedly installed at the bottom of the lower sealing cone 421. A support frame 423 is fixedly installed on the outer surface of the lower ring frame 422. The support frame 423 is fixedly installed on the top of the fixed plate 41. The lower ring frame 422 and the support frame 423 are used to fix and support the lower sealing cone 421 to ensure that the lower sealing cone 421 is installed firmly.

[0048] The support frame 423 is evenly distributed along the axis of the lower ring frame 422. The support frame 423 and the guide rail 431 are spaced apart to avoid mutual interference between the components during operation.

[0049] Example 3, based on Examples 1 and 2, please refer to... Figure 6-8 As shown, the testing mechanism 8 includes a slide 81, an upper seal 82, and a positive pressure chamber 83. The slide 81 is slidably installed on the outer surface of the column 9 to ensure that the overall lifting and lowering of the testing mechanism 8 is stable. The upper seal 82 is fixedly installed on the inner side of the slide 81 by a bracket. The upper seal 82 is used to seal the top of the fuel injector. An inflation pipe 84 is fixedly connected between the upper seal 82 and the positive pressure chamber 83. The positive pressure chamber 83 is fixedly installed on the top of the support plate 11. The positive pressure chamber 83 is used to provide high-pressure gas for testing. The inflation pipe 84 is used to transport the high-pressure gas to the inside of the workpiece.

[0050] The upper seals 82 are evenly distributed inside the carriage 81, and the upper seals 82 are positioned directly above the positioning mechanism 4 to ensure precise docking with the positioning mechanism 4.

[0051] A pressure gauge 85 is fixedly installed on the inflation tube 84. The pressure gauge 85 is connected to the control panel 10 via an electrical signal. The pressure gauge 85 is used to monitor the gas pressure in real time and transmit the pressure data to the control panel 10.

[0052] The upper seal 82 includes an upper sealing cone 821 and an upper ring frame 824. The upper sealing cone 821 is used to seal the top of the fuel injector. A ring cover 822 is fixedly installed on the top of the upper sealing cone 821. An elastic support rod 823 is rotatably installed on the outer surface of the ring cover 822 via a rotating shaft. The other end of the elastic support rod 823 is rotatably installed on the inner side of the upper ring frame 824 via a rotating shaft. The elastic support rod 823 is used to provide mating buffer to avoid wear on the end face of the workpiece and to ensure sealing fit. An air inlet 825 is opened at the axis of the upper sealing cone 821. The air inlet 825 is used to introduce high-pressure gas into the inside of the fuel injector.

[0053] The inflation tube 84 is fixedly installed at the axis of the ring cover 822, and the inflation tube 84 is connected to the inflation hole 825 to ensure smooth gas delivery;

[0054] The elastic struts 823 are evenly distributed along the axis of the ring cover 822, and the elastic struts 823 are inclinedly set on the outer surface of the ring cover 822, so that the buffering and support force is more even.

[0055] An airtightness testing device for aircraft engine fuel injectors comprises the following steps:

[0056] S1. Place the fuel injector of the aircraft engine to be tested on the top of the positioning mechanism 4. The outer wall of the workpiece contacts the roller 435. The squeezing roller 435 drives the mounting arc block 434, the upright rod 433 and the slide block 432 to slide outward along the guide rail 431. The connecting spring 436 is stretched to generate clamping force, realizing automatic centering and clamping of the workpiece. At the same time, the bottom end of the workpiece is in contact with the lower sealing cone block 421 of the lower sealing component 42 to complete the bottom sealing of the workpiece.

[0057] S2. Start the hydraulic cylinder 5 through the control panel 10. The hydraulic cylinder 5 drives the telescopic rod 6 to move the lifting seat 7 and the detection mechanism 8 together along the column 9, so that the upper seal 82 of the detection mechanism 8 is close to the top of the workpiece.

[0058] S3. The upper sealing cone 821 contacts the top of the workpiece, compressing the elastic support rod 823 to shrink and buffer. After the elastic support rod 823 shrinks to the position, the upper sealing cone 821 completely fits the top of the workpiece, thus achieving a seal at the top of the workpiece.

[0059] S4. Start the positive pressure chamber 83 and inflate the workpiece with air through the air inlet 825 of the upper sealing cone 821 via the air inlet pipe 84. The pressure gauge 85 monitors the inflation pressure in real time and transmits the data to the control panel 10. The pressure value displayed on the control panel 10 is used to determine whether the air tightness of the fuel injector is qualified.

[0060] During use, the operator places the fuel injectors of the aircraft engine to be tested one by one on the six positioning mechanisms 4 at the top of the workbench 1. During the placement of the workpiece, the outer wall first contacts the rollers 435 of the positioning component 43. The workpiece exerts a squeezing force on the outer rollers 435, pushing the mounting arc block 434, the upright 433 and the slide block 432 to slide horizontally outward along the guide rail 431 on the fixed plate 41. The connecting spring 436 between adjacent mounting arc blocks 434 is stretched and generates a reverse clamping force, which drives the rollers 435 to always be in contact with the outer wall of the workpiece, completing the automatic centering and clamping of the workpiece and preventing the workpiece from shifting or tilting.

[0061] At the same time, the bottom end of the workpiece is tightly fitted with the lower sealing cone 421 of the lower sealing component 42, and the lower ring frame 422 and the support frame 423 stably support the lower sealing cone 421 to ensure the bottom of the workpiece is sealed, thus completing the workpiece loading and bottom sealing steps.

[0062] The hydraulic cylinder 5 is started by the control panel 10. The hydraulic cylinder 5 drives the telescopic rod 6 to extend downward. The telescopic rod 6 drives the lifting seat 7 at the bottom to move downward in sync. The lifting seat 7 then drives the detection mechanism 8 to move downward as a whole. The slide 81 of the detection mechanism 8 slides vertically along the outer wall of the column 9 to ensure that the detection mechanism 8 rises and falls smoothly and does not deviate until the upper seal 82 of the detection mechanism 8 approaches the top of the oil injector workpiece on the positioning mechanism 4.

[0063] The upper sealing cone 821 first contacts the top of the workpiece, and the top of the workpiece exerts an upward squeezing force on the upper sealing cone 821, which drives the ring cover 822 to move upward. This causes the elastic support rod 823 on the outside of the ring cover 822 to contract under force. The elastic support rod 823 provides a buffer for the sealing process and avoids hard contact between the upper sealing cone 821 and the sealing end face of the workpiece, which would cause wear. When the elastic support rod 823 is contracted to the correct position, the upper sealing cone 821 is completely fitted with the top of the workpiece, and together with the lower sealing cone 421, completes the full sealing of the upper and lower ends of the workpiece.

[0064] The positive pressure chamber 83 is activated via the control panel 10. The high-pressure test gas generated by the positive pressure chamber 83 is delivered through the inflation pipe 84, passing sequentially through the ring cover 822 and the inflation hole 825 of the upper sealing cone 821 before entering the interior of the fuel injector workpiece. The pressure gauge 85 on the inflation pipe 84 monitors the internal gas pressure value in real time and transmits the pressure data to the control panel 10 in real time via an electrical signal. The operator judges the pressure value displayed on the control panel 10. If the pressure value remains stable without decreasing, it indicates that the fuel injector is airtight. If the pressure value drops rapidly, it indicates that the workpiece has a gas leak and is not airtight, thus completing the entire testing process.

[0065] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An aircraft engine fuel nozzle air tightness detection apparatus, characterized by, include: A workbench, wherein a vertical plate is fixedly installed at the top edge of the workbench, a top plate is fixedly installed at the top of the vertical plate, columns are fixedly installed between the workbench and the four corners at the bottom of the top plate, a control panel is fixedly installed on the outer surface of the workbench, a support frame plate is fixedly installed on the outer surface of the vertical plate, and legs are fixedly installed at the four corners at the bottom of the workbench. A positioning mechanism is fixedly installed on the top of the workbench. There are six positioning mechanisms, and the six positioning mechanisms are equidistantly distributed on the top of the workbench. A hydraulic cylinder is fixedly installed at the middle of the top of the top plate. A telescopic rod is fixedly connected to the telescopic end of the hydraulic cylinder. The telescopic rod passes through the top plate and extends to its bottom. A lifting seat is fixedly installed at the bottom of the telescopic rod. A detection mechanism is fixedly installed at the bottom of the lifting seat. The positioning mechanism includes a fixed plate, and a lower seal and a positioning element are installed on the top of the fixed plate; The positioning component includes a guide rail, which is fixedly installed on a fixed disk. The guide rail is evenly distributed along the axis of the fixed disk. A slide block is slidably installed on the top of the guide rail. A vertical rod is fixedly installed on the top of the slide block. An installation arc block is fixedly installed on the top of the vertical rod. A roller is rotatably installed on the inner curved surface of the installation arc block via a rotating shaft. A connecting spring is fixedly connected between adjacent installation arc blocks.

2. The aircraft engine fuel nozzle air tightness detection apparatus of claim 1, wherein: The lower sealing element includes a lower sealing cone block, which is disposed at the middle of the top of the fixed plate. A lower ring frame is fixedly installed at the bottom of the lower sealing cone block, and a support frame is fixedly installed on the outer surface of the lower ring frame. The support frame is fixedly installed on the top of the fixed plate.

3. An aircraft engine fuel nozzle air tightness detection apparatus as defined in claim 2, wherein: The support frames are evenly distributed along the axis of the lower ring frame, and the support frames are spaced apart from the guide rails.

4. The airtightness testing equipment for aircraft engine fuel injectors according to claim 3, characterized in that: The testing mechanism includes a slide, an upper seal, and a positive pressure chamber. The slide is slidably mounted on the outer surface of the column. The upper seal is fixedly mounted on the inner side of the slide by a bracket. An inflation pipe is fixedly connected between the upper seal and the positive pressure chamber. The positive pressure chamber is fixedly mounted on the top of the support plate.

5. The airtightness testing device for an aero-engine fuel injector according to claim 4, characterized in that: The upper seals are evenly distributed inside the carriage and are positioned directly above the positioning mechanism.

6. The airtightness testing device for an aero-engine fuel injector according to claim 5, characterized in that: A pressure gauge is fixedly installed on the inflation tube, and the pressure gauge is connected to the control panel via an electrical signal.

7. The airtightness testing device for an aero-engine fuel injector according to claim 6, characterized in that: The upper sealing element includes an upper sealing cone and an upper ring frame. A ring cover is fixedly installed on the top of the upper sealing cone. An elastic support rod is rotatably installed on the outer surface of the ring cover via a rotating shaft. The other end of the elastic support rod is rotatably installed on the inner side of the upper ring frame via a rotating shaft. An air inlet is provided at the axial center of the upper sealing cone.

8. The airtightness testing device for an aero-engine fuel injector according to claim 7, characterized in that: The inflation tube is fixedly installed at the axis of the ring cover, and the inflation tube is connected to the inflation hole.

9. The airtightness testing device for an aero-engine fuel injector according to claim 8, characterized in that: The elastic struts are evenly distributed along the axis of the ring cover, and the elastic struts are inclinedly arranged on the outer surface of the ring cover.

10. The airtightness testing device for an aero-engine fuel injector according to claim 9 is now further described, along with a method for testing the airtightness of an aero-engine fuel injector, characterized in that... It consists of the following steps: S1. Place the fuel injector of the aircraft engine to be tested on the top of the positioning mechanism. The outer wall of the workpiece contacts the roller. The squeezing roller drives the mounting arc block, the upright and the slide to slide outward along the guide rail. The connecting spring is stretched to generate clamping force, realizing automatic centering and clamping of the workpiece. At the same time, the bottom end of the workpiece fits with the lower sealing cone of the lower sealing component to complete the bottom sealing of the workpiece. S2. Start the hydraulic cylinder through the control panel. The hydraulic cylinder drives the telescopic rod to move the lifting seat and the detection mechanism as a whole along the column, so that the upper seal of the detection mechanism is close to the top of the workpiece. S3. The upper sealing cone contacts the top of the workpiece, compressing the elastic support rod to shrink and buffer. After the elastic support rod shrinks to the correct position, the upper sealing cone completely fits the top of the workpiece, thus achieving a seal at the top of the workpiece. S4. Start the positive pressure chamber and inflate the workpiece with air through the air inlet of the air pipe and the air inlet of the upper sealing cone. The pressure gauge monitors the inflation pressure in real time and transmits the data to the control panel. The pressure value displayed on the control panel is used to determine whether the air tightness of the fuel injector is qualified.

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