An ammonia fuel injector fault simulation automatic test bench

Abstract

The utility model discloses a marine injector simulation test technical field's ammonia fuel injector fault simulation automation test board, including support mechanism, be located on the support mechanism and be used for the fixed bearing mechanism of ammonia fuel injector, and be located on the support mechanism for the detection mechanism of ammonia fuel injector insertion, the detection mechanism is used to gather ammonia fuel injector injection data, and this test board still includes simulation mechanism, and simulation mechanism includes the injector needle valve jamming simulation part of being located on the bearing mechanism. The test board of the utility model integrates injector needle valve jamming simulation part and detection mechanism, can automatically, high accuracy simulates ammonia fuel injector needle valve jamming fault and real -time collection injection data, wherein, injector needle valve jamming simulation part can reproduce the movement retardation operating condition caused by carbon deposition or wear through connecting rod assembly and pressure ware assembly cooperation, and the reality of fault simulation and the comprehensiveness of test data have been improved significantly.

Description

Technical Field

[0001] This utility model relates to the field of marine injector simulation testing, specifically to an automated test bench for simulating ammonia fuel injector failures. Background Technology

[0002] Ammonia fuel injectors are widely used in marine engines. As a core component for achieving efficient and clean combustion of zero-carbon fuels, their reliability directly affects the engine's power, economy, and emissions levels. (See attached...) Figure 6 The image shows an existing ammonia fuel injector, which includes an injector body 1, a moving component that can move axially along the injector body 1 within the injector body 1, a first reset assembly 4, a needle valve 6, and an electromagnetic assembly 5, etc. The moving component includes an armature 3 and a guide body 2. The armature 3 is at least partially disposed within the receiving cavity of the injector body 1, and the proximal end of the guide body 2 is connected to the armature 3. During actual operation, the magnetic force generated by the energized electromagnetic assembly 5 cooperates with the restoring force provided by the first reset assembly to control the armature 3 to drive the guide body 2 and the needle valve 6 to perform axial movement, thereby realizing the injection opening and closing function.

[0003] Under actual high temperature and high pressure conditions, ammonia fuel injectors are prone to malfunctions such as needle valve jamming or nozzle plate blockage due to carbon buildup, wear, or lubrication failure. These malfunctions can easily lead to fuel injection quantity deviation, atomization quality degradation, spray pattern distortion, and abnormal injection timing, seriously affecting engine operation stability and emission control. Currently, there is a lack of test equipment capable of simulating ammonia fuel injector malfunctions and performing performance testing. Most tests rely on disassembling and analyzing the ammonia fuel injector after the fact. However, this method is difficult to reproduce the dynamic process when the malfunction occurs and is inefficient, resulting in delayed fault diagnosis. Therefore, we propose an automated test bench for simulating ammonia fuel injector malfunctions. Utility Model Content

[0004] The purpose of this invention is to provide an automated test bench for simulating ammonia fuel injector failures, which solves the problem that most existing ammonia fuel injector failures rely on post-failure disassembly and analysis, and lack test equipment that can simulate failures and perform performance testing.

[0005] This utility model achieves the above objectives through the following technical solutions: An automated test bench for simulating ammonia fuel injector failure includes a support mechanism, a carrier mechanism mounted on the support mechanism for fixing the ammonia fuel injector, and a detection mechanism mounted on the support mechanism for inserting the ammonia fuel injector. The detection mechanism is used to collect ammonia fuel injector injection data. The test bench also includes a simulation mechanism, which includes an injector needle valve jamming simulation part mounted on the carrier mechanism. The injector needle valve jamming simulation part includes a mounting bracket on the support mechanism, a connecting rod assembly that is axially movably inserted into the mounting bracket, and a pressure device assembly on the mounting bracket for applying pressure to the connecting rod assembly. One end of the connecting rod assembly extends into the ammonia fuel injector fixed in the support mechanism and is fixed and connected to the guide tube.

[0006] A further improvement is that the detection mechanism includes an outer shell mounted on a support mechanism, a transparent inner shell located within the outer shell, an opening at the top of the outer shell and communicating with the transparent inner shell, a fuel injection measuring instrument located within the transparent inner shell and corresponding to the opening, the fuel injection measuring instrument being used to collect data on the fuel injection quantity and injection rate of a single injection cycle of the ammonia fuel injector, a laser detection component located on the inner wall of the outer shell for collecting data on the shape of fuel droplets, an optical window embedded in the transparent inner shell and corresponding to the laser detection component, and an image acquisition device located within the outer shell and facing the opening, the image acquisition device being used to collect spray image data of the ammonia fuel injector, and the image acquisition device, the laser detection component, and the fuel injection measuring instrument are all connected to the central control system.

[0007] A further improvement is that the bearing mechanism includes a first telescopic device connected to the support mechanism, a bearing frame located at the output end of the first telescopic device and connected to the mounting frame, and an injector clamping assembly located on the bearing frame for clamping and fixing the ammonia fuel injector.

[0008] A further improvement is that the connecting rod assembly includes a connecting pipe, one end of which is used to connect to an external fuel supply line, and the other end extends into the conduit body. A stepped through hole is opened in the connecting pipe, and a wedge tube is movably disposed in its large diameter section. One end of the wedge tube is connected to a conductive tube, and one end of the conductive tube extends into the small diameter section of the stepped through hole. A permanent magnet is sleeved on the outer wall of the conductive tube, and an electromagnetic ring is provided on the stepped end face of the stepped through hole for energizing and attracting the permanent magnet so that the conductive tube and the wedge tube move upward. Several sets of locking blocks are movably inserted into the outer circumference of the connecting pipe, and one end of each locking block abuts against the outer wall of the wedge tube. The locking blocks are used to move outward by the wedge tube when the wedge tube moves upward and contact and fix with the inner wall of the conduit body. The locking blocks are connected to the connecting pipe through a first elastic element, and the other end of the wedge tube is connected to the connecting pipe through a second elastic element.

[0009] A further improvement is that the pressure unit assembly includes two sets of second telescopic devices arranged radially on both sides of the connector and mounted on a mounting bracket, a first pressure sensor located at the output end of the second telescopic device, a contact head located at the detection end of the first pressure sensor and used to contact the outer wall of the connector, and the outer wall of the connector is also provided with a second pressure sensor for detecting the pressure of fuel entering it. Both the first pressure sensor and the second pressure sensor are connected to the central control system.

[0010] A further improvement is that the fuel injection measuring instrument includes a fuel injection quantity measuring physical mechanism and a signal data processing module; the fuel injected by the ammonia fuel injector is injected into the volume chamber of the fuel injection quantity measuring physical mechanism; The support mechanism includes a support platform connected to the outer shell, a fuel receiving cavity opened in the support platform, and a discharge connecting pipe that communicates with the fuel receiving cavity and penetrates the side wall of the support platform. The fuel receiving cavity is connected to the volume cavity of the fuel injection quantity measuring physical mechanism through a pipeline, and a solenoid valve is provided in the pipeline.

[0011] A further improvement is that the simulation mechanism also includes a nozzle clogging simulation unit; The nozzle blockage simulation unit includes a top shell located at the top of the outer casing and communicating with the opening; an movable port on the top of the top shell for inserting an ammonia fuel injector; a mounting plate that moves horizontally through the side wall of the top shell; and several sets of test nozzle plates that are detachably fixed to the mounting plate, with each test nozzle plate penetrating the mounting plate. The several sets of test nozzle plates are provided with groups of holes of different blockage patterns. The mounting plate is connected to the top shell through a third telescopic device, which is used to drive the mounting plate to move horizontally so that the several sets of test nozzle plates correspond to the injection outlets of the ammonia fuel injector.

[0012] A further improvement is that the hole group includes several groups of through holes with different diameters or different shielding areas.

[0013] The beneficial effects of this utility model are as follows: This utility model's test bench integrates an injector needle valve jamming simulation unit and a detection mechanism, enabling automated and high-precision simulation of ammonia fuel injector needle valve jamming faults and real-time acquisition of injection data. The injector needle valve jamming simulation unit, through the cooperation of a connecting rod assembly and a pressure device assembly, can reproduce motion stagnation conditions caused by carbon buildup or wear, significantly improving the realism of the fault simulation and the comprehensiveness of the test data. It effectively reproduces the dynamic process during fault occurrence with high efficiency and convenient fault diagnosis. It also includes a nozzle blockage simulation unit, which, through multiple test nozzle plates combined with a third telescopic device, allows for rapid switching between different blockage modes without disassembling the ammonia fuel injector, enabling simulation tests of various nozzle blockage faults. This greatly improves testing efficiency and the diversity of operating conditions, significantly enhancing the overall testing capabilities of the entire test bench. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the automated test bench structure of this utility model; Figure 2 This utility model Figure 1 Structural sectional view; Figure 3 This is a schematic diagram of the injector needle valve jamming simulation part of this utility model; Figure 4This utility model Figure 3 A partial structural sectional view in the image; Figure 5 This is a schematic diagram of the nozzle clogging simulation part of this utility model; Figure 6 This is a schematic diagram of an existing ammonia fuel injector.

[0015] In the diagram: 100, Support mechanism; 101, Support platform; 102, Fuel receiving chamber; 103, Discharge connecting pipe; 200, Bearing mechanism; 201, First telescopic device; 202, Bearing frame; 203, Injector clamping assembly; 300, Injector needle valve jamming simulation part; 301, Mounting frame; 302, Connecting pipe; 303, Second telescopic device; 304, First pressure sensor; 305, Contact head; 306, Second pressure sensor; 307, Conductor pipe; 308, Wedge tube; 309, Electromagnetic ring; 310, Clamping block; 31 1. First elastic element; 312. Second elastic element; 400. Detection mechanism; 401. Outer shell; 402. Transparent inner shell; 403. Optical window; 404. Laser detection assembly; 405. Through port; 406. Image acquisition device; 407. Oil injection measuring instrument; 500. Nozzle blockage simulation part; 501. Top shell; 502. Mounting plate; 503. Third telescopic device; 504. Test nozzle plate; 1. Injector body; 2. Guide tube body; 3. Armature; 4. First reset assembly; 5. Electromagnetic assembly; 6. Needle valve; 7. Nozzle plate body. Detailed Implementation

[0016] The present application will now be described in further detail with reference to the accompanying drawings. It should be noted that the following specific embodiments are only used to further illustrate the present application and should not be construed as limiting the scope of protection of the present application. Those skilled in the art can make some non-essential improvements and adjustments to the present application based on the above application content.

[0017] It should be noted that the ammonia fuel injector used in this test bench is a conventional structure widely used in the field. Preferably, as shown in the attached diagram... Figure 6 The image shows an injector disclosed in publication number CN218563782U, and furthermore, as shown in the appendix... Figure 6 As shown, the injector body 1 is also provided with a nozzle plate body 7 at the injection outlet. Although the above-mentioned prior art documents do not describe or show it in detail, the nozzle plate body 7 is a key component in the ammonia fuel injector to realize the atomization injection function. It is a conventional structure known in the art, and its design and application have been widely seen in various existing technical solutions. It will not be described in detail here.

[0018] Example 1 Please see the appendix Figure 1-4 and attached Figure 6An automated test bench for simulating ammonia fuel injector failure includes a support mechanism 100, which provides structural stability and a foundation for the entire test bench; a bearing mechanism 200 mounted on the support mechanism 100 for fixing the ammonia fuel injector, enabling precise clamping and fixing of the ammonia fuel injector; and a detection mechanism 400 mounted on the support mechanism 100 for inserting the ammonia fuel injector. The detection mechanism 400 is used to collect ammonia fuel injector injection data, including fuel injection quantity and injection rate data for a single injection cycle, fuel droplet morphology data, and spray image data. The test bench also includes a simulation mechanism for simulating actual fault types. The simulation mechanism includes an injector needle valve jamming simulation part 300 located on the bearing mechanism 200, which simulates the needle valve 6 movement jamming fault caused by carbon deposits, wear or poor lubrication. This test bench can accurately reproduce and comprehensively evaluate the working status and fault effects of ammonia fuel injectors, significantly improving the accuracy of fault diagnosis, the reliability of test results, and the efficiency of R&D testing. In this embodiment, the injector needle valve jamming simulation unit 300 includes a U-shaped mounting bracket 301 mounted on the support mechanism 200. This mounting bracket 301 provides stable support and precise guidance for its internal moving components. A connecting rod assembly, axially movably inserted into the mounting bracket 301, achieves directional movement through a circular opening on the mounting bracket 301. Optionally, a low-friction coefficient pulley is provided within this circular opening, forming a sliding fit with a vertical groove on the outer wall of the connecting rod assembly. This effectively constrains the degree of freedom of movement of the connecting rod assembly and reduces frictional resistance and uneven wear during movement. A pressure device assembly is installed on the mounting bracket 301 to apply pressure to the connecting rod assembly. One end of the connecting rod assembly extends into the ammonia fuel injector fixed in the bearing mechanism 200 and is fixed and connected to the conduit body 2. This ensures that the fuel can be transmitted without damage while accurately transmitting the externally applied force to the moving parts inside the injector. After the connecting rod assembly is fixed to the conduit body 2, when the armature 3 moves and drives the conduit body 2 to move, it also drives the connecting rod assembly to move. Under the pressure given by the pressure device assembly, the armature 3 will encounter resistance in its movement, and the resistance will be transmitted to the needle valve 6, simulating a needle valve jamming fault.

[0019] Please see the appendix Figure 2Preferably, the detection mechanism 400 of this embodiment includes an outer shell 401 disposed on the support mechanism 100. The outer shell 401 is cylindrical and its upper and lower ends are closed. A transparent inner shell 402 is disposed inside the outer shell 401. Optionally, the transparent inner shell 402 is made of a high optical transmittance material, such as optical glass or quartz glass. An opening 405 is opened at the top of the outer shell 401 and communicates with the transparent inner shell 402. A fuel injection measuring instrument 407 is disposed inside the transparent inner shell 402 and corresponds to the opening 405. The fuel injection measuring instrument 407 is used to collect the fuel injection quantity and fuel injection rate data of a single injection cycle of the ammonia fuel injector. A fuel injection measuring instrument 407 is disposed on the inner wall of the outer shell 401 for collecting fuel injection data. The laser detection component 404 for droplet morphology data may optionally employ a laser particle size analyzer widely used in the art, but is not limited to this type; an optical window 403 embedded in the transparent inner shell 402 and corresponding to the laser detection component 404 ensures distortion-free laser measurement; and an image acquisition device 406 disposed inside the outer shell 401 and facing the port 405 may optionally be a high-speed camera. The image acquisition device 406 is used to acquire ammonia fuel injector spray image data. The image acquisition device 406, the laser detection component 404, and the fuel injection measuring instrument 407 are all connected to the central control system. The aforementioned testing agency 400 can comprehensively and accurately obtain data on the spray pattern and droplet distribution of ammonia fuel injectors during the fault simulation test, greatly improving the data richness and reliability of the results of the fault simulation test, and providing solid data support and analytical foundation for the performance evaluation, fault diagnosis and optimization design of ammonia fuel injectors.

[0020] Optionally, in this embodiment, an annular scraper is also embedded in the top inner wall of the outer shell 401. The scraper is located inside the transparent inner shell 402 and is driven by an electric telescopic rod provided on the outer shell 401 to move axially to clean the inner wall of the transparent inner shell 402.

[0021] Please see the appendix Figure 1-2Preferably, the support mechanism 200 of this embodiment includes a first telescopic device 201 connected to the support mechanism 100. Optionally, the first telescopic device 201 is an electric telescopic rod, a hydraulic telescopic rod, or a ball screw slide module, which provides precise and stable linear displacement in the vertical direction. A support frame 202 is provided at the output end of the first telescopic device 201 and connected to the mounting frame 301. The support frame 202 has a rectangular opening for the ammonia fuel injector to be tested to pass through. When the support frame 202 moves up and down with the first telescopic device 201, it also drives the injector needle valve jamming simulation part 300 to move up and down synchronously. An injector clamping assembly 203 is provided on the support frame 202 for clamping and fixing the ammonia fuel injector. Optionally, the injector clamping assembly 203 includes a V-block or a special clamp driven by a pneumatic or servo motor to achieve fast, centered and non-slip secure clamping of the ammonia fuel injector. The aforementioned support mechanism 200 enables precise control of the position of the ammonia fuel injector within the testing space and ensures its stability during fault simulation tests. This provides crucial foundational conditions for the use of the injector needle valve jamming simulation unit 300 and for the testing mechanism 400 to acquire data, significantly improving the testing accuracy and reliability of the entire test bench.

[0022] Please see the appendix Figure 3-4 Preferably, the connecting rod assembly of this embodiment includes a connecting pipe 302, which is the main structure and hollow inside. The inner diameter of the connecting pipe 302 is smaller than the inner diameter of the conduit body 2. One end of the connecting pipe 302 is used to connect to an external fuel supply line, and the other end extends into the conduit body 2. Optionally, the connecting pipe 302 is sealed to the external fuel supply line through a quick-connect fitting. A sealing ring is also embedded in the outer wall of its other end to ensure the sealing of the connection between the connecting pipe 302 and the conduit body 2. A stepped through-hole is provided inside the connecting pipe 302. The stepped through-hole consists of a large-diameter section and a small-diameter section. The stepped end face refers to the end face formed at the connection between the large-diameter section and the small-diameter section. A wedge-shaped tube 308 is movably installed within the large-diameter section. The vertical cross-section of the wedge-shaped tube 308 is trapezoidal. One end of the wedge-shaped tube 308 is connected to a guide tube 307. One end of the guide tube 307 extends into the small-diameter section of the stepped through-hole. The outer diameter of the guide tube 307 and the inner diameter of the small-diameter section are connected. The guide tube 307 is fitted with a permanent magnet block on its outer wall. An electromagnetic ring 309 is provided on the stepped end face of the stepped through hole to attract the permanent magnet block, allowing the guide tube 307 and wedge tube 308 to move upwards. Several sets of circumferentially evenly distributed locking blocks 310 are radially inserted into the outer circumferential wall of the connecting tube 302. One end of each locking block 310 abuts against the outer wall of the wedge tube 308. One end is configured as an inclined surface that mates with the outer wall of the wedge tube 308. The locking block 310 is used to move outward by the wedge tube 308 when the wedge tube 308 is moving upward and contact and fix it with the inner wall of the conduit body 2. The locking block 310 is connected to the connecting pipe 302 through a first elastic element 311 (such as a fatigue-resistant compression spring). The first elastic element 311 provides the elastic force for the locking block 310 to return to its radial position. The other end of the wedge tube 308 is connected to the connecting pipe 302 through a second elastic element 312 (such as a fatigue-resistant compression spring). Optionally, a protrusion is integrally formed at the bottom of the inner wall of the connecting pipe 302 and connected to the end of the second elastic element 312 away from the wedge tube 308. The second elastic element 312 is used to drive the wedge tube 308 and the conducting pipe 307 to return downward as a whole by using elastic restoring force after the electromagnetic ring 309 is de-energized, thereby releasing the fixed state of the locking block 310 for easy disassembly.

[0023] The aforementioned connecting rod assembly enables a rapid, reliable, and automated connection and sealing between the connector and the ammonia fuel injector conduit 2. This not only ensures the stability and sealing of the fuel flow channel, avoiding leakage risks during testing, but more importantly, the connecting rod assembly, in conjunction with the subsequent pressure unit assembly, allows the axial resistance force or displacement disturbance required for the needle valve 6 jamming fault simulation test to be precisely and repeatedly applied to the moving parts inside the ammonia fuel injector. This realistically simulates the obstructed movement of the needle valve 6 due to carbon buildup, wear, or lubrication failure, providing crucial technical support for the performance evaluation and reliability testing of the ammonia fuel injector.

[0024] Please see the appendix Figure 3-4Preferably, the pressure device assembly of this embodiment includes two sets of second telescopic devices 303 radially arranged on both sides of the connecting pipe 302 and mounted on the mounting bracket 301. Optionally, the second telescopic device 303 in this embodiment is a high-precision servo electric cylinder or a piezoelectric ceramic actuator, capable of outputting programmable and controllable precise displacement and load. A first pressure sensor 304 is provided at the output end of the second telescopic device 303. The pressure sensor is a conventional electrical device in the art and will not be described in detail here. The first pressure sensor 304 monitors the radial contact pressure applied to the connecting pipe 302 in real time. A contact head 305 is provided at the detection end of the first pressure sensor 304 and is used to contact the outer wall of the connecting pipe 302. The contact head 305 maintains stable contact with the outer wall of the connecting pipe 302 and transmits pressure. The outer wall of the connecting pipe 302 is also provided with a second pressure sensor 306 for detecting the fuel pressure entering it. Both the first pressure sensor 304 and the second pressure sensor 306 are connected to the central control system to transmit the detected data to the central control system. The aforementioned pressure device assembly allows for real-time adjustment of the output of the second telescopic device 303 based on feedback from the first pressure sensor 304, ensuring that the radial interference force applied to the connecting pipe 302 precisely matches the preset fault conditions. Furthermore, the second pressure sensor 306 continuously monitors the fluctuations in fuel supply pressure during the needle valve 6's operation and jamming simulation, thereby comprehensively evaluating the impact of needle valve 6 jamming on injection. This approach significantly enhances the realism of the fault simulation and the comprehensiveness of the test data, providing a reliable technical means for in-depth research into the failure mechanism of ammonia fuel injectors.

[0025] Please see the appendix Figure 2 Preferably, the fuel injection measuring instrument 407 in this embodiment includes a fuel injection quantity measuring physical mechanism and a signal data processing module; the fuel injected by the ammonia fuel injector is injected into the volume chamber of the fuel injection quantity measuring physical mechanism; the fuel injection measuring instrument 407 is widely used in the art and will not be described in detail here. The support mechanism 100 includes a support platform 101 connected to the housing 401, a fuel receiving cavity 102 opened in the support platform 101, and a discharge connecting pipe 103 communicating with the fuel receiving cavity 102 and penetrating the side wall of the support platform 101. The connecting pipe is used to discharge residual fuel to an external recovery system. The fuel receiving cavity 102 is connected to the volume cavity of the fuel injection quantity measuring physical mechanism through a pipeline, and a solenoid valve is provided in the pipeline. The solenoid valve is controlled by a central control system to control the flow and isolation of fuel between the two cavities. The above settings ensure the continuity of the measurement process and facilitate centralized cleaning and maintenance of the system, significantly improving the automation, safety, and ease of operation of the test bench.

[0026] Example 2 Please see the appendix Figure 2 and Figure 5 Based on Example 1, the simulation mechanism in this embodiment also includes a nozzle blockage simulation unit 500; The nozzle clogging simulation unit 500 includes a top shell 501 located at the top of the outer casing 401 and communicating with the through-hole 405; a movable port opened at the top of the top shell 501 for inserting an ammonia fuel injector; optionally, the inner wall of the movable port is fitted with an ammonia-resistant fluororubber or perfluoroether rubber sealing ring to effectively improve the static and dynamic sealing at the connection between the ammonia fuel injector and the movable port, preventing fuel leakage; a horizontally movable mounting plate 502 penetrating the side wall of the top shell 501, the length of the mounting plate 502 being greater than the length of the top shell 501; and several sets of test nozzle plates 504 detachably fixed to the mounting plate 502. Optionally, this... In this embodiment, the test nozzle plate 504 can be fixed to the mounting plate 502 using screws or other fixing components, and each test nozzle plate 504 penetrates the mounting plate 502, that is, the mounting plate 502 has through holes for installing the test nozzle plates 504; several groups of test nozzle plates 504 are respectively provided with hole groups of different blockage patterns to simulate various actual nozzle blockage failure conditions; the mounting plate 502 is connected to the top shell 501 through a third telescopic device 503 (such as an electric telescopic rod); the third telescopic device 503 is used to drive the mounting plate 502 to move horizontally so that several groups of test nozzle plates 504 correspond to the injection outlet of the ammonia fuel injector respectively. By using multiple test nozzle plates 504 and combining them with the third telescopic device 503, different clogging modes can be quickly switched without disassembling the ammonia fuel injector, realizing nozzle clogging simulation tests. This greatly improves testing efficiency and operating condition diversity. It not only provides a reliable and flexible test method for studying the impact of different clogging types on spray characteristics, flow characteristics and emission performance, but also ensures the comparability and accuracy of test data, significantly enhancing the overall testing capability of the entire test bench.

[0027] Preferably, the hole group in this embodiment includes several groups of through holes with different diameters or different shielding areas to simulate various actual nozzle blockage failure conditions caused by carbon deposits, colloid deposition or foreign matter blockage. Of course, the hole group is not limited to the above types, and may also include oblique holes, multi-hole combination blockage structures, etc., which will not be described in detail here. The quick replacement of the test nozzle plate 504 facilitates the study of the impact of various nozzle blockage faults on spray characteristics, flow coefficient, emission generation, and combustion stability. This flexible and reliable test simulation method not only significantly improves test efficiency but also provides indispensable experimental data support for establishing a nozzle blockage fault database, developing intelligent diagnostic algorithms, and optimizing anti-clogging design, thus promoting the development of ammonia fuel injection systems towards higher reliability and longer service life.

[0028] The above embodiments only illustrate several implementation methods of this utility model, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model.

Claims

1. An automated test bench for simulating ammonia fuel injector failure, characterized in that, The test bench includes a support mechanism (100), a carrier mechanism (200) mounted on the support mechanism (100) for fixing the ammonia fuel injector, and a detection mechanism (400) mounted on the support mechanism (100) for inserting the ammonia fuel injector. The detection mechanism (400) is used to collect ammonia fuel injector injection data. The test bench also includes a simulation mechanism, which includes an injector needle valve jamming simulation part (300) mounted on the carrier mechanism (200). The injector needle valve jamming simulation part (300) includes a mounting bracket (301) on the support mechanism (200), a connecting rod assembly that is axially movably inserted into the mounting bracket (301), and a pressure device assembly on the mounting bracket (301) for applying pressure to the connecting rod assembly. One end of the connecting rod assembly extends into the ammonia fuel injector fixed by the support mechanism (200) and is fixed and connected to the conduit body.

2. The automated test bench according to claim 1, characterized in that, The detection mechanism (400) includes an outer shell (401) mounted on a support mechanism (100), a transparent inner shell (402) located inside the outer shell (401), a through-hole (405) located on the top of the outer shell (401) and communicating with the transparent inner shell (402), and an injection measuring instrument (407) located inside the transparent inner shell (402) and corresponding to the through-hole (405). The injection measuring instrument (407) is used to collect data on the injection quantity and injection rate of the ammonia fuel injector in a single injection cycle and is located on the inner wall of the outer shell (401). A laser detection component (404) for collecting fuel droplet morphology data, an optical window (403) embedded in a transparent inner shell (402) and corresponding to the laser detection component (404), and an image acquisition device (406) located inside the outer shell (401) and facing the opening (405). The image acquisition device (406) is used to collect ammonia fuel injector spray image data. The image acquisition device (406), the laser detection component (404), and the fuel injection measuring instrument (407) are all connected to the central control system.

3. The automated test bench according to claim 1, characterized in that, The bearing mechanism (200) includes a first telescopic device (201) connected to the support mechanism (100), a bearing frame (202) located at the output end of the first telescopic device (201) and connected to the mounting frame (301), and an injector clamping assembly (203) located on the bearing frame (202) for clamping and fixing the ammonia fuel injector.

4. The automated test bench according to claim 1, characterized in that, The connecting rod assembly includes a connecting pipe (302), one end of which is used to connect to an external fuel supply pipeline, and the other end extends into the conduit body. A stepped through hole is opened in the connecting pipe (302), and a wedge-shaped tube (308) is movably disposed in its large-diameter section. One end of the wedge-shaped tube (308) is connected to a conductive tube (307), and one end of the conductive tube (307) extends into the small-diameter section of the stepped through hole. A permanent magnet is sleeved on the outer wall of the conductive tube (307), and an electromagnetic ring (309) is provided on the stepped end face of the stepped through hole for energizing and attracting the permanent magnet so that the conductive tube ( 307) and wedge tube (308) move upward. Several sets of locking blocks (310) are movably inserted into the outer circumference of the connecting tube (302). One end of each locking block (310) abuts against the outer wall of the wedge tube (308). The locking block (310) is used to move outward by the wedge tube (308) when the wedge tube (308) moves upward and contact and fix with the inner wall of the conduit body. The locking block (310) is connected to the connecting tube (302) through the first elastic element (311). The other end of the wedge tube (308) is connected to the connecting tube (302) through the second elastic element (312).

5. The automated test bench according to claim 4, characterized in that, The pressure unit assembly includes two sets of second telescopic devices (303) arranged radially on both sides of the connector (302) and mounted on the mounting bracket (301), a first pressure sensor (304) located at the output end of the second telescopic device (303), and a contact head (305) located at the detection end of the first pressure sensor (304) for contacting the outer wall of the connector (302). The outer wall of the connector (302) is also provided with a second pressure sensor (306) for detecting the pressure of fuel entering its interior. Both the first pressure sensor (304) and the second pressure sensor (306) are connected to the central control system.

6. The automated test bench according to claim 2, characterized in that, The fuel injection measuring instrument (407) includes a fuel injection quantity measuring physical mechanism and a signal data processing module; the fuel injected by the ammonia fuel injector is injected into the volume chamber of the fuel injection quantity measuring physical mechanism; The support mechanism (100) includes a support platform (101) connected to the outer shell (401), a fuel receiving cavity (102) opened in the support platform (101), and a discharge connecting pipe (103) communicating with the fuel receiving cavity (102) and penetrating the side wall of the support platform (101). The fuel receiving cavity (102) is connected to the volume cavity of the fuel injection quantity measuring physical mechanism through a pipeline, and a solenoid valve is provided in the pipeline.

7. The automated test bench according to claim 2, characterized in that, The simulation mechanism also includes a nozzle blockage simulation unit (500); The nozzle blockage simulation unit (500) includes a top shell (501) located on the top of the outer shell (401) and communicating with the port (405), an active port opened on the top of the top shell (501) for inserting an ammonia fuel injector, a mounting plate (502) that horizontally moves through the side wall of the top shell (501), and several sets of test nozzle plates (504) that are detachably fixed on the mounting plate (502), and each test nozzle plate (504) penetrates the mounting plate (502). The several sets of test nozzle plates (504) are respectively provided with holes of different blockage forms. The mounting plate (502) is connected to the top shell (501) through a third telescopic device (503). The third telescopic device (503) is used to drive the mounting plate (502) to move horizontally so that the several sets of test nozzle plates (504) correspond to the injection outlet of the ammonia fuel injector.

8. The automated test bench according to claim 7, characterized in that, The hole group includes several groups of through holes with different diameters or different shielding areas.

Images