Ammonia fuel injector fault simulation automation test bench and test method

Abstract

The invention discloses an ammonia fuel injector fault simulation automation test bench and test method in the technical field of marine injector simulation test, and the test bench comprises a supporting mechanism, a bearing mechanism which is disposed on the supporting mechanism and is used for fixing an ammonia fuel injector, and a detection mechanism which is disposed on the supporting mechanism and is used for the insertion of the ammonia fuel injector. The detection mechanism is used for collecting injection data of the ammonia fuel injector, and the simulation mechanism comprises an oil injector needle valve clamping stagnation simulation part arranged on the bearing mechanism. According to the test bed, the oil injector needle valve clamping stagnation simulation part and the detection mechanism are integrated, an ammonia fuel injector needle valve clamping stagnation fault can be automatically simulated in a high-precision mode, and injection data can be collected in real time, and the oil injector needle valve clamping stagnation simulation part is matched with the pressure gauge assembly through the connecting rod assembly; the motion retardation working condition caused by carbon deposition or abrasion can be reproduced, and the authenticity of fault simulation and the comprehensiveness of test data are remarkably improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of marine injector simulation test, in particular to an ammonia fuel injector fault simulation automation test bench and test method. BACKGROUND

[0002] Ammonia fuel injectors are widely used on marine engines as core components for efficient and clean combustion of zero-carbon fuel, and their operational reliability is directly related to the power, economy and emission levels of the engine. Figure 6 As shown in the prior art ammonia fuel injector, the ammonia fuel injector includes an injector body 1, a moving component arranged in the injector body 1 and movable axially along the injector body 1, a first return assembly 4, a needle valve 6 and an electromagnetic assembly 5, etc., wherein the moving component includes an armature 3 and a conduit body 2, the armature 3 is at least partially arranged in a receiving cavity of the injector body 1, the proximal end of the conduit body 2 is connected with the armature 3, and in the actual working process, the magnetic force generated by the electromagnetic assembly 5 and the restoring force provided by the first return assembly cooperate with each other to control the armature 3 to drive the conduit body 2 and the needle valve 6 to perform axial movement, thereby realizing the functions of opening and closing the injection.

[0003] Under actual high-temperature and high-pressure working conditions, ammonia fuel injectors are prone to faults such as needle valve movement jamming or injection orifice plate clogging due to carbon deposition, wear or lubrication failure, which can easily cause injection quantity deviation, decreased atomization quality, distorted spray pattern and abnormal injection timing, seriously affecting the engine's running stability and emission control. Currently, there is a lack of test equipment that can simulate ammonia fuel injector faults and perform performance detection, and most rely on post-disassembly analysis of ammonia fuel injectors. However, this method is difficult to reproduce the dynamic process when the fault occurs and is inefficient, leading to delayed fault diagnosis. Therefore, we propose an ammonia fuel injector fault simulation automation test bench and test method. SUMMARY

[0004] The present application aims to provide an ammonia fuel injector fault simulation automation test bench and test method, which solves the problem that most existing ammonia fuel injector faults rely on post-disassembly analysis and lack of test equipment that can simulate faults and perform performance detection.

[0005] The present application achieves the above-mentioned purpose through the following technical solutions: An ammonia fuel injector fault simulation automation test bench, comprising a support mechanism, a bearing mechanism arranged on the support mechanism for fixing the ammonia fuel injector, and a detection mechanism arranged on the support mechanism for inserting the ammonia fuel injector, the detection mechanism being used for collecting ammonia fuel injector injection data, the test bench further comprising a simulation mechanism, the simulation mechanism comprising a fuel injector needle valve jamming simulation part arranged on the bearing mechanism; The needle valve sticking simulation part comprises a mounting frame arranged on the bearing mechanism, a connecting rod assembly movably arranged in the mounting frame in the axial direction, and a pressure device arranged on the mounting frame and used for applying pressure to the connecting rod assembly. One end of the connecting rod assembly extends into the ammonia fuel injector fixed to the bearing mechanism and is fixedly connected to the conduit body.

[0006] Further improvement lies in that the detection mechanism comprises a shell arranged on the support mechanism, a transparent inner shell arranged in the shell, an opening arranged at the top of the shell and communicating with the transparent inner shell, a fuel injection measurer arranged in the transparent inner shell and corresponding to the opening, the fuel injection measurer being used for collecting the fuel injection amount and fuel injection rate data of a single injection cycle of the ammonia fuel injector, a laser detection assembly arranged on the inner wall of the shell and used for collecting fuel droplet morphology data, an optical window embedded on the transparent inner shell and corresponding to the laser detection assembly, and an image acquisition device arranged in the shell and facing the opening, the image acquisition device being used for collecting spray image data of the ammonia fuel injector, and the image acquisition device, the laser detection assembly and the fuel injection measurer are connected to the central control system.

[0007] Further improvement lies in that the bearing mechanism comprises a first telescopic device connected to the support mechanism, a bearing frame arranged at the output end of the first telescopic device and connected to the mounting frame, and a fuel injector clamping assembly arranged on the bearing frame and used for clamping and fixing the ammonia fuel injector.

[0008] Further improvement lies in that the connecting rod assembly comprises a butt joint pipe, one end of the butt joint pipe being used for connecting an external fuel supply pipeline and the other end extending into the conduit body, a stepped through hole being arranged in the butt joint pipe, a wedge-shaped pipe being movably arranged in the large-diameter section of the stepped through hole, a lead-through pipe being in communication with one end of the wedge-shaped pipe and extending into the small-diameter section of the stepped through hole, a permanent magnet block being sleeved on the outer wall of the lead-through pipe, an electromagnetic ring being arranged on the stepped end face of the stepped through hole and used for attracting the permanent magnet block to move the lead-through pipe and the wedge-shaped pipe upward, a plurality of clamping blocks being movably arranged on the circumferential outer wall of the butt joint pipe, one end of each clamping block being in abutment with the outer wall of the wedge-shaped pipe, the clamping blocks being driven by the wedge-shaped pipe to move outward and be in contact with the inner wall of the conduit body when the wedge-shaped pipe moves upward, the clamping blocks being connected to the butt joint pipe through first elastic members, and the other end of the wedge-shaped pipe being connected to the butt joint pipe through second elastic members.

[0009] Further improvement lies in that the pressure device comprises two groups of second telescopic devices arranged radially on both sides of the butt joint pipe and arranged on the mounting frame, a first pressure sensor arranged at the output end of the second telescopic device, a contact head arranged at the detection end of the first pressure sensor and used for contacting the outer wall of the butt joint pipe, a second pressure sensor arranged on the outer wall of the butt joint pipe and used for detecting the fuel pressure in the interior of the butt joint pipe, and the first pressure sensor and the second pressure sensor being connected to the central control system.

[0010] Further improvement lies in that the fuel injection measuring instrument comprises a fuel injection measuring physical mechanism and a signal data processing module; the fuel injected by the ammonia fuel injector is injected into the volume cavity of the fuel injection measuring physical mechanism; The support mechanism comprises a support table connected with the shell, a fuel containing cavity opened in the support table, and a discharge connecting pipe penetrating through the side wall of the support table and communicating with the fuel containing cavity, the fuel containing cavity and the volume cavity of the fuel injection measuring physical mechanism are communicated through a pipeline, and an electromagnetic valve is arranged in the pipeline.

[0011] Further improvement lies in that the simulation mechanism further comprises a nozzle blockage simulation part; The nozzle blockage simulation part comprises a top shell arranged at the top of the shell and communicating with the through port, a movable port opened at the top of the top shell and used for inserting the ammonia fuel injector, a mounting plate horizontally movably penetrating through the side wall of the top shell, and a plurality of groups of test nozzle plates detachably fixed on the mounting plate, each test nozzle plate penetrates through the mounting plate, a plurality of groups of holes with different blockage modes are arranged on the plurality of groups of test nozzle plates respectively, and the mounting plate is connected with the top shell through a third telescopic device, the third telescopic device is used for driving the mounting plate to move horizontally so that the plurality of groups of test nozzle plates correspond to the injection outlets of the ammonia fuel injector respectively.

[0012] Further improvement lies in that the hole groups comprise a plurality of groups of through holes with different diameters or different shielding areas.

[0013] An ammonia fuel injector fault simulation test method, which utilizes the automatic test table, comprises the following steps: S1: fixing the ammonia fuel injector to be tested through the bearing mechanism, and inserting the ammonia fuel injector into the detection mechanism; S2: inserting one end of the connecting rod assembly into the ammonia fuel injector fixed by the bearing mechanism and fixing and communicating with the conduit body of the ammonia fuel injector, and communicating the other end of the connecting rod assembly with the external fuel supply pipeline; S3: applying a preset pressure to the connecting rod assembly through the pressure device assembly, supplying fuel into the connecting rod assembly through the external fuel supply pipeline, so that the fuel enters the ammonia fuel injector, the electromagnetic assembly in the ammonia fuel injector controls the armature to drive the conduit body and the needle valve to move to spray the fuel into the detection mechanism, and the detection mechanism collects the ammonia fuel injector injection data.

[0014] The beneficial effects of the present application are as follows: The test bench integrates the fuel injector needle valve jamming simulation part and the detection mechanism, can automatically and high-precisely simulate the ammonia fuel injector needle valve jamming fault and collect the injection data in real time, the fuel injector needle valve jamming simulation part can reproduce the movement retardation working condition caused by the carbon deposition or the wear through the cooperation of the connecting rod assembly and the pressure device assembly, the authenticity of the fault simulation and the comprehensiveness of the test data are significantly improved, the dynamic process when the fault occurs is effectively reproduced and the efficiency is higher, the fault diagnosis is convenient, and the nozzle blockage simulation part is further arranged, different blockage modes can be quickly switched without disassembling the ammonia fuel injector through the third telescopic equipment combined with the test nozzle plate, the simulation test of various nozzle blockage faults is realized, the test efficiency and the working condition diversity are greatly improved, and the comprehensive test capability of the whole test bench is significantly enhanced. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 It is a structure schematic view of the automatic test bench of the application; Figure 2 It is a structure schematic view of the automatic test bench of the application; Figure 1 It is a structure sectional view of the automatic test bench of the application; Figure 3 It is a structure schematic view of the fuel injector needle valve jamming simulation part of the application; Figure 4 It is a structure sectional view of the automatic test bench of the application; Figure 3 Figure 5 It is a structure schematic view of the nozzle blockage simulation part of the application; Figure 6 It is a structure schematic view of the nozzle blockage simulation part of the application.

[0016] In the figure: 100, a support mechanism; 101, a support table; 102, a fuel containing cavity; 103, a discharge connecting pipe; 200, a bearing mechanism; 201, a first telescopic equipment; 202, a bearing frame; 203, a fuel injector clamping assembly; 300, a fuel injector needle valve jamming simulation part; 301, a mounting frame; 302, a butt joint pipe; 303, a second telescopic equipment; 304, a first pressure sensor; 305, a contact head; 306, a second pressure sensor; 307, a through pipe; 308, a wedge-shaped pipe; 309, an electromagnetic ring; 310, a clamping block; 311, a first elastic piece; 312, a second elastic piece; 400, a detection mechanism; 401, an outer shell; 402, a transparent inner shell; 403, an optical window; 404, a laser detection assembly; 405, a through port; 406, an image acquisition equipment; 407, a fuel injection measuring instrument; 500, a nozzle blockage simulation part; 501, a top shell; 502, a mounting plate; 503, a third telescopic equipment; 504, a test nozzle plate; 1, an injector body; 2, a guide pipe body; 3, an armature; 4, a first reset assembly; 5, an electromagnetic assembly; 6, a needle valve; 7, a nozzle plate main body. DETAILED DESCRIPTION ​

[0017] The present application is described in further detail below in conjunction with the accompanying drawings. It is necessary to point out that the following specific implementation methods are only used to further illustrate the present application and cannot be understood as limiting the scope of protection of the present application. Technicians in this field can make some non-essential improvements and adjustments to the present application based on the above application content.

[0018] It should be noted that the ammonia fuel injector adapted to this test bench is a conventional structure widely used in the art. Preferably, as shown in the attached Figure 6 As shown in the publication number: CN218563782U, an ejector is proposed. Figure 6 As shown, the injection outlet of the injector body 1 is further provided with a nozzle plate body 7. Although the above-cited prior art documents do not focus on describing and illustrating it, the nozzle plate body 7 is a key component for realizing the atomizing injection function in the ammonia fuel injector. It belongs to a conventional structure well known in the art, and its design and application have been widely seen in various prior art solutions, and will not be described in detail here.

[0019] Example 1 Please see the attached Figures 1-4 and attached Figure 6 An automated test bench for simulating ammonia fuel injector faults includes a support mechanism 100, which provides structural stability and a mounting foundation for the entire test bench; a carrier mechanism 200, disposed on the support mechanism 100, for securing the ammonia fuel injector, thereby enabling precise clamping and securing of the ammonia fuel injector; and a detection mechanism 400, disposed on the support mechanism 100, into which the ammonia fuel injector is inserted. The detection mechanism 400 is configured to collect injection data from the ammonia fuel injector, including 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 stuck simulation unit 300 provided on a supporting mechanism 200 to simulate a needle valve 6 stuck fault caused by carbon deposits, wear or poor lubrication. This test bench can accurately reproduce and comprehensively evaluate the operating status and fault impact of ammonia fuel injectors, significantly improving the accuracy of fault diagnosis, the reliability of test results, and R&D and testing efficiency. In this embodiment, the fuel injector needle valve sticking simulation part 300 includes a U-shaped mounting bracket 301 provided on the carrier mechanism 200, which provides stable support and precise guidance for the internal moving components; a connecting rod assembly movably inserted into the mounting bracket 301 in the axial direction, which realizes directional movement through a circular opening provided on the mounting bracket 301, and a low-friction pulley is optionally arranged in the circular opening and forms a sliding fit with a vertical sliding groove provided on the outer wall of the connecting rod assembly, effectively restricting the movement freedom of the connecting rod assembly and reducing the friction resistance and eccentric wear during movement, and a pressure applicator assembly provided 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 in the carrier mechanism 200 and is fixed and communicated with the conduit body 2, ensuring that the fuel can be transmitted without damage while accurately transmitting the external force to the internal moving components of the injector, after the connecting rod assembly is fixed with the conduit body 2, when the armature 3 moves to drive the conduit body 2 to move, it also drives the connecting rod assembly to move, and under the pressure action of the pressure applicator assembly, the armature 3 will move with resistance, and then the resistance will be transmitted to the needle valve 6, simulating the needle valve sticking fault.

[0020] Please refer to the accompanying Figure 2 As preferred, the detection mechanism 400 of the embodiment includes a housing 401 provided on the support mechanism 100, the housing 401 is cylindrical and the upper and lower ends are closed; a transparent inner shell 402 provided in the housing 401, optionally, the transparent inner shell 402 is made of high optical transmittance material, such as optical glass or quartz glass; a through opening 405 provided at the top of the housing 401 and communicated with the transparent inner shell 402, a fuel injection measuring instrument 407 provided in the transparent inner shell 402 and corresponding to the through opening 405, the fuel injection measuring instrument 407 is used to collect the fuel injection amount and fuel injection rate data of a single injection cycle of the ammonia fuel injector; a laser detection assembly 404 provided on the inner wall of the housing 401 for collecting fuel droplet morphology data, optionally, the laser detection assembly 404 uses a laser particle size analyzer widely used in the field, of course, it is not limited to this; an optical window 403 embedded on the transparent inner shell 402 and corresponding to the laser detection assembly 404, which ensures that the laser measurement is not distorted, and an image acquisition device 406 provided in the housing 401 and facing the through opening 405, optionally, the image acquisition device 406 is a high-speed camera, the image acquisition device 406 is used to collect ammonia fuel injector spray image data, the image acquisition device 406, the laser detection assembly 404 and the fuel injection measuring instrument 407 are connected with the central control system; Through the above-mentioned detection mechanism 400, the data from the spray shape to the droplet distribution of the ammonia fuel injector during the fault simulation test injection process can be comprehensively and accurately obtained, which greatly improves the data richness and result reliability of the fault simulation test, and provides a solid data support and analysis foundation for the performance evaluation, fault diagnosis and optimization design of the ammonia fuel injector.

[0021] Optionally, the inner wall of the top of the shell 401 in the embodiment is also embedded with an annular scraper inside the transparent inner shell 402, which is driven by an electric telescopic rod provided on the shell 401 to axially move and clean the inner wall of the transparent inner shell 402.

[0022] Please refer to the accompanying drawings Figures 1-2 As preferred, the bearing mechanism 200 of the embodiment comprises a first telescopic device 201 connected to the support mechanism 100, which is optionally an electric telescopic rod, a hydraulic telescopic rod or a ball screw sliding table module, etc., providing accurate and stable linear displacement in the vertical direction; a bearing frame 202 provided at the output end of the first telescopic device 201 and connected to the mounting frame 301, the bearing frame 202 has a rectangular port for the ammonia fuel injector to pass through, and the bearing frame 202 drives the injector needle valve sticking simulation part 300 to move up and down synchronously when moving up and down with the first telescopic device 201; an injector clamping assembly 203 provided on the bearing frame 202 for clamping and fixing the ammonia fuel injector, which is optionally a V-shaped block or a special clamp driven by a pneumatic or servo motor, achieving fast, centered and slip-free clamping of the ammonia fuel injector; The above-mentioned bearing mechanism 200 can realize accurate control of the position of the ammonia fuel injector in the detection space and ensure its stability during fault simulation test, thereby providing essential basic conditions for the use of the injector needle valve sticking simulation part 300 and the data acquisition of the detection mechanism 400, and significantly improving the test accuracy and result reliability of the entire test bench.

[0023] Please refer to the accompanying drawings Figures 3-4 As preferred, the connecting rod assembly of the embodiment comprises a butt joint pipe 302 as the main structure and internally hollow, the inner diameter of the butt joint pipe 302 is smaller than the inner diameter of the conduit body 2, one end of the butt joint pipe 302 is used to connect the external fuel supply pipeline, and the other end extends into the conduit body 2, which is optionally sealed and communicated with the external fuel supply pipeline through a quick plug connector, and a sealing ring is embedded on the outer wall of the other end of the butt joint pipe 302 to ensure the sealing of the connection between the butt joint pipe 302 and the conduit body 2. A stepped through hole is provided in the butt joint 302. The stepped through hole is composed of a large diameter section and a small diameter section. The stepped end face refers to the end face formed at the position where the large diameter section and the small diameter section are connected. A wedge-shaped tube 308 is movably provided in the large diameter section. The vertical section of the wedge-shaped tube 308 is trapezoidal. One end of the wedge-shaped tube 308 is connected to a conducting tube 307. One end of the conducting tube 307 extends to the small diameter section of the stepped through hole. The outer diameter of the conducting tube 307 is the same as that of the inner diameter of the small diameter section. The outer wall of the conducting tube 307 is provided with a permanent magnet block, and the stepped end face of the stepped through hole is provided with an electromagnetic ring 309, which is used to energize and attract the permanent magnet block so that the conducting tube 307 and the wedge-shaped tube 308 move upward. The outer wall of the butt-jointed tube 302 is radially movable and provided with a plurality of groups of circumferentially evenly distributed clamping blocks 310, one end of each clamping block 310 abuts against the outer wall of the wedge-shaped tube 308, and the clamping block 310 abuts against the wedge-shaped tube 308. One end is set as an inclined surface that matches the inclined outer wall of the wedge-shaped tube 308. The blocking block 310 is used to be driven by the wedge-shaped tube 308 to move outward and contact and fix with the inner wall of the catheter body 2 when the wedge-shaped tube 308 is upward. The blocking block 310 is connected to the docking tube 302 through a first elastic member 311 (such as a fatigue-resistant compression spring, etc.). The first elastic member 311 provides an elastic force for radial reset of the blocking block 310. The other end of the wedge-shaped tube 308 is connected to the docking tube 302 through a second elastic member 312 (such as a fatigue-resistant compression spring, etc.). Optionally, a protrusion is integrally formed at the bottom of the inner wall of the docking tube 302 and is connected to the end of the second elastic member 312 away from the wedge-shaped tube 308. The second elastic member 312 is used to use the elastic restoring force to drive the wedge-shaped tube 308 and the conducting tube 307 to reset downward as a whole after the electromagnetic ring 309 is powered off, thereby releasing the fixed state of the blocking block 310 for easy disassembly.

[0024] The above-mentioned connecting rod assembly realizes fast, reliable and automatic connection and sealing with the ammonia fuel injector conduit body 2, which not only ensures the stability and sealing of the fuel flow channel and avoids the risk of leakage during the test, but more importantly, the connecting rod assembly cooperates with the subsequent pressure device assembly to enable the axial blocking force or displacement interference required in the needle valve 6 stuck fault simulation test to be accurately and repeatably applied to the internal moving parts of the ammonia fuel injector, thereby realistically simulating the working condition of the needle valve 6 movement obstruction caused by carbon deposits, wear or lubrication failure, providing key technical guarantees for the performance evaluation and reliability testing of the ammonia fuel injector.

[0025] Please see the attached Figures 3-4As preferred, the pressure device assembly of the embodiment comprises two sets of second telescopic devices 303 arranged radially on both sides of the butt joint pipe 302 and provided on the mounting frame 301. Optionally, the second telescopic device 303 of the embodiment is a high-precision servo electric cylinder or a piezoelectric ceramic actuator, which can output programmable control accurate 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, which will not be described in detail here. The radial contact pressure applied to the butt joint pipe 302 is monitored in real time through the first pressure sensor 304. A contact head 305 is provided at the detection end of the first pressure sensor 304 and used to contact the outer wall of the butt joint pipe 302. The contact head 305 maintains stable contact with the outer wall of the butt joint pipe 302 and transmits pressure. The outer wall of the butt joint pipe 302 is also provided with a second pressure sensor 306 for detecting the fuel pressure entering the inside. The first pressure sensor 304 and the second pressure sensor 306 are connected with the central control system, for transmitting the detected data to the central control system. Through the pressure device assembly, on the one hand, the output of the second telescopic device 303 can be adjusted in real time according to the feedback of the first pressure sensor 304, so as to ensure that the radial interference force applied to the butt joint pipe 302 accurately matches the preset fault working condition. On the other hand, the fluctuation change of the fuel supply pressure in the process of the needle valve 6 action and jamming simulation can be continuously monitored through the second pressure sensor 306, so as to comprehensively evaluate the influence of the needle valve 6 jamming on the injection. This way significantly improves the authenticity of the fault simulation and the comprehensiveness of the test data, and provides a reliable technical means for in-depth research on the failure mechanism of the ammonia fuel injector.

[0026] Please refer to the accompanying drawings Figure 2 As preferred, the fuel injection measuring instrument 407 of the embodiment comprises a fuel injection amount measuring physical mechanism and a signal data processing module. The fuel injected by the ammonia fuel injector is injected into the volume cavity of the fuel injection amount measuring physical mechanism. The fuel injection measuring instrument 407 is widely used in the art, which will not be described in detail here. The support mechanism 100 comprises a support table 101 connected with the shell 401, a fuel containing cavity 102 opened in the support table 101, and a discharge connecting pipe 103 penetrating through the side wall of the support table 101 and communicating with the fuel containing cavity 102, which is used to guide the residual fuel out to the external recovery system. The fuel containing cavity 102 and the volume cavity of the fuel injection amount measuring physical mechanism are connected through a pipeline, and an electromagnetic valve is provided in the pipeline. The electromagnetic valve is controlled by the central control system, which is used to control the flow and isolation of fuel between the two cavities. The above arrangement ensures the continuity of the measurement process, and facilitates the centralized cleaning and maintenance of the system, significantly improving the automation degree, safety and operation convenience of the test bench.

[0027] A kind of ammonia fuel injector fault simulation test method, using the automated test bench described above, comprising the following steps: S1: the ammonia fuel injector to be tested is fixed by bearing mechanism 200, and the ammonia fuel injector is inserted into detection mechanism 400; S2: one end of the connecting rod assembly is inserted into the ammonia fuel injector fixed by the bearing mechanism 200 and is fixed and communicated with the conduit body of the ammonia fuel injector, and the other end of the connecting rod assembly is communicated with the external fuel supply pipeline; S3: a predetermined pressure is applied to the connecting rod assembly by the pressure device assembly, fuel is supplied to the connecting rod assembly through the external fuel supply pipeline, so that the fuel enters the ammonia fuel injector, the electromagnetic assembly in the ammonia fuel injector controls the armature to drive the conduit body and the needle valve to move to make the fuel spray into the detection mechanism 400, and the ammonia fuel injector injection data is collected by the detection mechanism 400.

[0028] Example 2 Please refer to the attached Figure 2 and Figure 5 On the basis of example 1, the simulation mechanism of this embodiment further comprises a nozzle clogging simulation part 500; The nozzle clogging simulation part 500 comprises a top shell 501 provided on the top of the shell 401 and communicated with the through port 405, a movable port provided on the top of the top shell 501 for inserting the ammonia fuel injector, optionally, a fluororubber or perfluoroether rubber sealing ring resistant to ammonia corrosion is embedded in the inner wall of the movable port to effectively improve the static and dynamic sealing performance of the connection between the ammonia fuel injector and the movable port, preventing fuel from escaping;A mounting plate 502 horizontally penetrates the side wall of the top shell 501, the length of the mounting plate 502 is greater than the length of the top shell 501, and a plurality of groups of test nozzle plates 504 are detachably fixed on the mounting plate 502, optionally, the test nozzle plate 504 of this embodiment can be fixed with the mounting plate 502 by using screws and other fixing components, and each test nozzle plate 504 penetrates the mounting plate 502, that is, the mounting plate 502 is provided with through holes for mounting the test nozzle plate 504;A plurality of groups of test nozzle plates 504 are respectively provided with a plurality of groups of holes with different clogging modes to simulate various actual nozzle clogging failure conditions, and the mounting plate 502 is connected to the top shell 501 by a third telescopic device 503 (such as an electric telescopic rod), and the third telescopic device 503 is used to drive the mounting plate 502 to move horizontally so that the plurality of groups of test nozzle plates 504 correspond to the injection outlet of the ammonia fuel injector respectively; By a variety of test orifice plate 504 and combined with the third telescopic device 503, different blockage modes can be quickly switched without disassembling the ammonia fuel injector, the orifice blockage simulation test is realized, the test efficiency and working condition diversity are greatly improved, not only a reliable and flexible test method is provided for researching the influence of different blockage types on spray characteristics, flow characteristics and emission performance, but also the comparability and accuracy of test data are guaranteed, and the comprehensive test capability of the entire test bench is significantly enhanced.

[0029] As preferred, the hole group of the embodiment includes several groups of through holes with different diameters or different blocking areas to simulate various actual orifice blockage failure conditions caused by carbon deposition, gum deposition or foreign matter blocking. Of course, the hole group is not limited to the above types, and can also include inclined holes, multi-hole combined blockage structures, etc., which are not described in detail here. By quickly replacing the test orifice plate 504, the influence of various orifice blockage failures on spray characteristics, flow coefficient, emission generation and combustion stability can be conveniently researched. This flexible and reliable test simulation method not only greatly improves the test efficiency, but also provides indispensable experimental data support for establishing an orifice blockage failure database, developing intelligent diagnostic algorithms and optimizing anti-blocking design, and promotes the development of ammonia fuel injection systems towards higher reliability and longer life.

[0030] The above embodiments only express several embodiments of the present application, and the description is more specific and detailed, but it should not be understood as a limitation on the scope of the patent of the present application. It should be noted that for ordinary skilled persons in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which are within the scope of protection of the present application.

Claims

1. An ammonia fuel injector fault simulation automated test bench, characterized in that: The test bench comprises a support mechanism (100), a carrying mechanism (200) provided on the support mechanism (100) for fixing an ammonia fuel injector, and a detection mechanism (400) provided on the support mechanism (100) for inserting the ammonia fuel injector, wherein the detection mechanism (400) is used to collect injection data of the ammonia fuel injector. The test bench also comprises a simulation mechanism, which comprises an injector needle valve stuck simulation part (300) provided on the carrying mechanism (200); The injector needle valve stuck simulation unit (300) comprises a mounting frame (301) provided on a supporting mechanism (200), a connecting rod assembly movably inserted into the mounting frame (301) along the axial direction, and a pressure device assembly provided on the mounting frame (301) for applying pressure to the connecting rod assembly, wherein one end of the connecting rod assembly extends into an ammonia fuel injector fixed to the supporting mechanism (200) and is fixed to and communicated with a conduit body.

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

3. The automated test bench according to claim 1, characterized in that: The carrying mechanism (200) comprises a first telescopic device (201) connected to the supporting mechanism (100), a carrying frame (202) provided at the output end of the first telescopic device (201) and connected to the mounting frame (301), and an injector clamping assembly (203) provided on the carrying 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 butt joint pipe (302), one end of which is used to connect to an external fuel supply pipeline, and the other end of which extends into the conduit body. A stepped through hole is provided in the butt joint pipe (302), and a wedge-shaped pipe (308) is movably provided in the large-diameter section of the butt joint pipe (302). One end of the wedge-shaped pipe (308) is connected to a conducting pipe (307), and one end of the conducting pipe (307) extends into the small-diameter section of the stepped through hole. A permanent magnet is sleeved on the outer wall of the conducting pipe (307), and an electromagnetic ring (309) is provided on the stepped end face of the stepped through hole for electrically adsorbing the permanent magnet so that the conducting pipe ( When the wedge-shaped tube (307) and the wedge-shaped tube (308) move upward, a plurality of groups of clamping blocks (310) are movably inserted into the outer wall of the circumference of the butt joint tube (302), one end of each clamping block (310) abuts against the outer wall of the wedge-shaped tube (308), and the clamping block (310) is used to be driven by the wedge-shaped tube (308) to move outward and contact and fix with the inner wall of the catheter body when the wedge-shaped tube (308) moves upward, and the clamping block (310) is connected to the butt joint tube (302) through a first elastic member (311), and the other end of the wedge-shaped tube (308) is connected to the butt joint tube (302) through a second elastic member (312).

5. The automated test bench according to claim 4, characterized in that: The pressure device assembly comprises two sets of second telescopic devices (303) respectively radially arranged on both sides of the butt joint tube (302) and provided on the mounting frame (301), a first pressure sensor (304) provided at the output end of the second telescopic device (303), a contact head (305) provided at the detection end of the first pressure sensor (304) and used to contact the outer wall of the butt joint tube (302), and a second pressure sensor (306) for detecting the pressure of fuel entering the butt joint tube (302). Both the first pressure sensor (304) and the second pressure sensor (306) are connected to a central control system.

6. The automated test bench according to claim 2, characterized in that: The fuel injection measuring instrument (407) comprises 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) comprises a support platform (101) connected to the housing (401), a fuel accommodating chamber (102) provided in the support platform (101), and a discharge connection pipe (103) communicating with the fuel accommodating chamber (102) and penetrating the side wall of the support platform (101); the fuel accommodating chamber (102) is communicated with a volume chamber of a physical mechanism for measuring the amount of fuel injected via 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 further includes a nozzle blockage simulation part (500); The nozzle blockage simulation unit (500) includes a top shell (501) disposed on the top of the outer shell (401) and connected to the through port (405), a movable port provided on the top of the top shell (501) for inserting an ammonia fuel injector, a mounting plate (502) horizontally movable and penetrating the side wall of the top shell (501), and a plurality of groups of test nozzle plates (504) detachably fixed on the mounting plate (502), wherein each test nozzle plate (504) penetrates the mounting plate (502), and each group of test nozzle plates (504) is provided with a group of holes with different blockage forms, respectively. The mounting plate (502) is connected to the top shell (501) via a third telescopic device (503), and the third telescopic device (503) is used to drive the mounting plate (502) to move horizontally so that the plurality of groups of test nozzle plates (504) correspond to the injection outlets 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.

9. An ammonia fuel injector fault simulation test method, using the automated test bench according to any one of claims 1 to 8, characterized in that: The following steps are involved: S1: Fixing the ammonia fuel injector to be tested by the supporting mechanism (200), and inserting the ammonia fuel injector into the testing mechanism (400); S2: extending one end of the connecting rod assembly into the ammonia fuel injector fixed by the supporting mechanism (200) and fixing and communicating with the conduit body of the ammonia fuel injector, and communicating the other end of the connecting rod assembly with an external fuel supply pipeline; S3: applying a preset pressure to the connecting rod assembly through the pressure device assembly, supplying fuel to the connecting rod assembly through the external fuel supply pipeline, so that the fuel enters the ammonia fuel injector, controlling the electromagnetic assembly in the ammonia fuel injector to control the armature to drive the guide tube body and the needle valve to move so that the fuel is sprayed into the detection mechanism (400), and collecting the ammonia fuel injector injection data through the detection mechanism (400).

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