Fatigue resistance testing device for fuel nozzle

Abstract

The utility model discloses an anti-fatigue testing device for a fuel nozzle, and relates to the technical field of automobile engineering. Comprising a supporting frame and further comprises a clamping assembly, the outer wall of the clamping assembly is fixedly connected with the outer wall of the supporting frame, and the outer wall of the supporting frame is fixedly connected with a detection assembly; the detection assembly comprises a top blowing shell, the outer wall of the top blowing shell is fixedly connected with a middle blowing shell through an air inlet branch pipe, and the top of the air inlet branch pipe is fixedly connected with the outer wall of the top blowing shell. All-dimensional air flow impact on the top, the middle and the bottom of the fuel nozzle is achieved, the alternating heat load borne by the fuel nozzle in the operation process of an engine can be simulated in combination with high-temperature environment control of the heating wire, the testing environment is closer to the actual working condition, and the purpose of the fuel nozzle anti-fatigue testing device is achieved.

Description

Technical Field

[0001] This utility model relates to the field of automotive engineering technology, specifically to a fuel nozzle fatigue testing device. Background Technology

[0002] As a core component of the engine's fuel injection system, the fuel nozzle must continuously withstand complex loads such as high temperature, high pressure combustion gas erosion, and periodic mechanical vibration during actual operation. Its fatigue resistance directly determines the engine's fuel atomization efficiency and reliability. However, existing fuel nozzle fatigue resistance testing technologies have the following limitations:

[0003] Traditional testing devices often use single heating or unidirectional airflow to simulate the working environment, which makes it difficult to reproduce the sudden temperature changes during engine start-stop (such as instantaneous temperature rise and fall from room temperature to 300°C) and the three-dimensional heat flow impact during high-speed operation (such as the combined heat load of high-temperature combustion gas scouring at the top, airflow cooling in the middle, and fuel wetting at the bottom). This results in a large deviation between the test conditions and the actual operating scenario, and the test results cannot accurately reflect the true fatigue life of the nozzle. Utility Model Content

[0004] (a) Technical problems to be solved

[0005] To address the shortcomings of existing technologies, this utility model provides a fuel nozzle fatigue testing device, which solves the problem that traditional testing devices often use single heating or unidirectional airflow to simulate the working environment, resulting in a large deviation between the test conditions and the actual operating scenario.

[0006] (II) Technical Solution

[0007] To achieve the above objectives, this utility model provides the following technical solution: a fuel nozzle fatigue testing device, comprising: a support frame, and further comprising: a clamping assembly, wherein the outer wall of the clamping assembly is fixedly connected to the outer wall of the support frame, and a detection assembly is fixedly connected to the outer wall of the support frame; the detection assembly comprises a top-blowing shell, wherein the outer wall of the top-blowing shell is fixedly connected to a middle-blowing shell via an intake branch pipe, and the top of the intake branch pipe is fixedly connected to the outer wall of the top-blowing shell, and the top of the intake branch pipe is fixedly connected to an intake manifold, a bottom-blowing shell is fixedly connected to the outer wall of the bottom of the support frame, and a blowpipe is fixedly connected to the top of the bottom-blowing shell, and the blowpipe is arranged in a circular array along the central axis of the bottom-blowing shell; a heating wire is fixedly connected to the outer wall of the support frame, and the heating wire is connected to an external power source.

[0008] Preferably, the outer wall of the bottom blowing shell is fixedly connected to the outer wall of the intake branch pipe, the wall of the top blowing shell is provided with an oblique blowing groove, and the oblique blowing groove is arranged in a circular array along the central axis of the top blowing shell, and the wall of the middle blowing shell is also provided with an oblique blowing groove.

[0009] Preferably, the outer wall of the middle blow shell is fixedly connected to the outer wall of the support frame, and the outer wall of the support frame is fixedly connected to the outer wall of the top blow shell.

[0010] Preferably, the clamping assembly includes a cylinder, the telescopic end of the cylinder is fixedly connected to a sliding plate, the inner walls on both sides of the sliding plate are slidably connected to a fixed plate through a limiting post, and the outer wall of the limiting post is fixedly connected to the outer wall of the fixed plate. The limiting post is used to limit the sliding position of the sliding plate.

[0011] Preferably, top springs are fixedly connected to the outer walls on both sides of the fixed plate, the outer wall of the limiting post is slidably connected to the inner wall of the sliding plate, the outer wall of the cylinder is fixedly connected to the outer wall of the support frame, and the outer wall of the support frame is fixedly connected to the outer wall of the fixed plate.

[0012] Preferably, the end of the top spring away from the fixed plate is fixedly connected to the outer wall of the sliding plate, and both the fixed plate and the outer wall of the sliding plate are fixedly connected to fixed columns, and the fixed columns are arranged in a linear array along the outer wall of the fixed plate.

[0013] (III) Beneficial Effects

[0014] This invention provides a fuel nozzle fatigue testing device. It has the following advantages:

[0015] (I) The fuel nozzle fatigue test device achieves all-round airflow impact on the top, middle and bottom of the fuel nozzle through the annular array airflow injection of the top blow shell, middle blow shell and bottom blow shell (oblique blow groove and blow pipe design). Combined with the high temperature environment control of the heating wire, it can simulate the alternating heat load (such as the sudden temperature change during start-stop and the local high temperature during high speed operation) borne by the fuel nozzle during engine operation, so that the test environment is closer to the actual working conditions and avoids the limitations of traditional single heating or blowing test.

[0016] (II) The fuel nozzle fatigue testing device can automatically adjust the clamping force according to the shape and size of the fuel nozzle by cooperating with the top spring and the limiting post in the clamping assembly, avoiding stress concentration caused by rigid clamping (such as local overload caused by dimensional deviation of traditional clamps), ensuring that the stress state of the fuel nozzle during the test is consistent with the actual installation conditions, improving the accuracy of fatigue life test. The linear array design of the fixing post fixes the fuel nozzle from multiple points, reducing vibration and displacement during clamping, and can remain stable even under high-frequency airflow impact, avoiding test data distortion caused by clamping looseness. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0018] Figure 2 This is a cross-sectional view of the present invention;

[0019] Figure 3 This is a schematic diagram of the clamping assembly of this utility model;

[0020] Figure 4 This is a schematic diagram of the detection component of this utility model.

[0021] In the diagram: 1. Support frame; 2. Clamping assembly; 3. Detection assembly; 21. Cylinder; 22. Sliding plate; 23. Limiting post; 24. Top spring; 25. Fixing plate; 26. Fixing post; 31. Main intake pipe; 32. Branch intake pipe; 33. Top blow shell; 34. Inclined blow groove; 35. Heating wire; 36. Middle blow shell; 37. Bottom blow shell; 38. Blow pipe. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] Please see Figure 1-4 This utility model provides a technical solution: a fuel injector fatigue testing device, comprising: a support frame 1, and a clamping assembly 2, the outer wall of the clamping assembly 2 being fixedly connected to the outer wall of the support frame 1, and a detection assembly 3 being fixedly connected to the outer wall of the support frame 1; the detection assembly 3 includes a top-blowing shell 33, the outer wall of the top-blowing shell 33 being fixedly connected to a middle-blowing shell 36 via an intake branch pipe 32, and the top of the intake branch pipe 32 being fixedly connected to the outer wall of the top-blowing shell 33, and the top of the intake branch pipe 32 being fixedly connected to an intake manifold 31; the outer wall of the bottom of the support frame 1 is fixedly connected to... A bottom-blowing shell 37 is connected to the bottom of the fuel nozzle, and a blowpipe 38 is fixedly connected to the top of the bottom-blowing shell 37. The blowpipe 38 is arranged in a ring array along the central axis of the bottom-blowing shell 37. A heating wire 35 is fixedly connected to the outer wall of the support frame 1. After the gas is ejected from the middle-blowing shell 36, it can blow evenly on the middle of the fuel nozzle, further reducing the temperature of the fuel nozzle. The blowpipe 38 at the bottom of the bottom-blowing shell 37 is also arranged in a ring array along the central axis. After the gas is ejected from the blowpipe 38, it blows on the bottom of the fuel nozzle, forming an all-round airflow impact simulation from the top, middle and bottom.

[0024] The outer wall of the bottom blow shell 37 is fixedly connected to the outer wall of the intake branch pipe 32. The top blow shell 33 has an inclined blowing groove 34 in its wall, and the inclined blowing groove 34 is arranged in a ring array along the central axis of the top blow shell 33. When the gas is ejected from the inclined blowing groove 34, it will form an airflow with a certain angle, which will blow the top of the fuel nozzle at multiple angles, thereby reducing the temperature of the fuel nozzle. The outer wall of the middle blow shell 36 is fixedly connected to the outer wall of the support frame 1, and the outer wall of the support frame 1 is fixedly connected to the outer wall of the top blow shell 33.

[0025] The clamping assembly 2 includes a cylinder 21. A sliding plate 22 is fixedly connected to the telescopic end of the cylinder 21. A fixed plate 25 is slidably connected to the inner walls of both sides of the sliding plate 22 via limiting posts 23. The outer wall of the limiting posts 23 is fixedly connected to the outer wall of the fixed plate 25. Top springs 24 are fixedly connected to the outer walls of both sides of the fixed plate 25. The outer wall of the limiting posts 23 is slidably connected to the inner wall of the sliding plate 22. The outer wall of the cylinder 21 is fixedly connected to the outer wall of the support frame 1. The outer wall of the support frame 1 is fixedly connected to the outer wall of the fixed plate 25. When the fuel injector is installed, the cylinder 21 starts to work, and its telescopic end pushes the sliding plate 22 to move along the direction of the limiting post 23. During the movement of the sliding plate 22, due to the restriction of the limiting post 23, the sliding plate 22 can only slide in a specific direction, which ensures the stability of the movement. The end of the top spring 24 away from the fixed plate 25 is fixedly connected to the outer wall of the sliding plate 22. The fixed plate 25 and the outer wall of the sliding plate 22 are both fixedly connected to the fixed posts 26, and the fixed posts 26 are arranged in a linear array along the outer wall of the fixed plate 25.

[0026] Fuel nozzles are subjected to complex thermal and mechanical loads during engine operation, and their fatigue resistance directly affects the reliability and service life of the engine. To test the fatigue resistance of fuel nozzles, this paper introduces a fuel nozzle fatigue testing device that simulates the actual working environment of fuel nozzles through the coordinated work of various components, so as to achieve effective testing of their fatigue resistance.

[0027] The overall structure of the device is based on the support frame 1, and the various functional components are installed on it in an orderly manner to form a complete testing system. Among them, the clamping component 2 and the detection component 3 are the core parts to realize the testing function. The two work together to complete the work of fixing, loading and testing the fuel nozzle.

[0028] The clamping assembly 2 mainly consists of a cylinder 21, a sliding plate 22, a limiting post 23, a fixing plate 25, a top spring 24, and a fixing post 26. Its function is to achieve stable clamping and adaptive adjustment of the fuel nozzle. When the fuel nozzle needs to be installed, the cylinder 21 starts to work, and its extension end pushes the sliding plate 22 to move along the direction of the limiting post 23. During the movement of the sliding plate 22, due to the restriction of the limiting post 23, the sliding plate 22 can only slide in a specific direction, which ensures the stability of the movement.

[0029] As the sliding plate 22 moves, it gradually approaches the fuel nozzle. The top spring 24 plays a crucial buffering role during this process. The combination of the sliding plate 22 and the fixed plate 25 can adjust the position of the sliding plate 22 according to the shape and size of the fuel nozzle, ensuring that the fixed plate 25 and the sliding plate 22 are in close contact with the surface of the fuel nozzle. After the fixed plate 25 and the sliding plate 22 contact the fuel nozzle, the design of the fixed post 26 arranged in a linear array along the outer wall of the fixed plate 25 can fix the fuel nozzle from multiple points, further improving the stability of the clamping. After the test, the cylinder 21 retracts, driving the sliding plate 22 to reset, releasing the fuel nozzle, and making it easy to remove.

[0030] The detection component 3 is the core detection part of the entire device. It consists of a top blow shell 33, an intake branch pipe 32, a middle blow shell 36, an intake main pipe 31, a bottom blow shell 37, a blow pipe 38, and a heating wire 35. It is mainly used to simulate the airflow and temperature environment when the fuel injector is working and to test its fatigue resistance.

[0031] The intake manifold 31 serves as the main intake channel, introducing external air into the device. After passing through the intake manifold 31, the gas enters the intake branch pipes 32, and is then distributed by the intake branch pipes 32 to the top blow shell 33, the middle blow shell 36, and the bottom blow shell 37. The top blow shell 33 has inclined blowing grooves 34 arranged in a ring along its central axis in the wall. When the gas is ejected from the inclined blowing grooves 34, it forms an airflow with a certain angle, which blows the top of the fuel nozzle at multiple angles, thereby reducing the temperature of the fuel nozzle.

[0032] The center blow shell 36 is fixedly connected to the support frame 1. After the gas is ejected from the center blow shell 36, it can evenly blow the middle of the fuel nozzle, further reducing the temperature of the fuel nozzle. The blow pipes 38 at the bottom of the bottom blow shell 37 are also arranged in a ring array along the central axis. After the gas is ejected from the blow pipes 38, it blows the bottom of the fuel nozzle, forming an all-round airflow impact simulation from the top, middle and bottom, accelerating the cooling speed of the fuel nozzle in all directions.

[0033] Heating wire 35 is fixed to the outer wall of support frame 1. It generates heat by energizing the entire fuel nozzle to simulate the high-temperature environment when the fuel nozzle is working. The temperature of heating wire 35 can be adjusted according to test requirements, so that the fuel nozzle can undergo fatigue testing under different temperature conditions, thereby improving the comprehensiveness and accuracy of the test.

[0034] During the test, the airflow ejected from the top blow shell 33, middle blow shell 36 and bottom blow shell 37 combines with the high temperature environment generated by the heating wire 35 to form a complex thermal load environment. Under this environment, the fuel nozzle continuously bears alternating thermal and mechanical loads, thereby testing its fatigue resistance. By observing the performance changes of the fuel nozzle during the test, such as whether cracks appear or whether the flow rate is abnormal, its fatigue life is evaluated.

[0035] Throughout the test, the clamping component 2 and the detection component 3 cooperate and work together. The clamping component 2 first fixes the fuel nozzle stably in the test position to ensure that it will not be displaced or loosened during the test. Then, the detection component 3 starts to work, with the intake system providing airflow and the heating wire 35 providing temperature to form a simulated working environment.

[0036] The testing component 3 can simulate different working conditions, such as engine working environments under different speeds and loads, by using different airflow injection methods of the top blow shell 33, middle blow shell 36 and bottom blow shell 37, as well as temperature control of the heating wire 35. By adjusting parameters such as airflow pressure, flow rate and temperature, it can comprehensively test the fatigue resistance performance of fuel nozzles under various complex working conditions.

[0037] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0038] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A fuel nozzle fatigue resistance testing apparatus, comprising: The support frame (1) is characterized in that it further includes: a clamping assembly (2), the outer wall of the clamping assembly (2) is fixedly connected to the outer wall of the support frame (1), and a detection assembly (3) is fixedly connected to the outer wall of the support frame (1); The detection component (3) includes a top-blowing shell (33), the outer wall of which is fixedly connected to a middle-blowing shell (36) via an air inlet branch pipe (32), and the top of the air inlet branch pipe (32) is fixedly connected to the outer wall of the top-blowing shell (33). The top of the air inlet branch pipe (32) is fixedly connected to an air inlet main pipe (31). The outer wall of the bottom of the support frame (1) is fixedly connected to a bottom-blowing shell (37), and the top of the bottom-blowing shell (37) is fixedly connected to a blowpipe (38). The blowpipe (38) is arranged in a ring array along the central axis of the bottom-blowing shell (37). The outer wall of the support frame (1) is fixedly connected to a heating wire (35).

2. A fuel nozzle anti-fatigue testing apparatus as claimed in claim 1, wherein: The outer wall of the bottom blowing shell (37) is fixedly connected to the outer wall of the air intake branch pipe (32), and the wall of the top blowing shell (33) is provided with an inclined blowing groove (34), and the inclined blowing groove (34) is arranged in a ring array along the central axis of the top blowing shell (33).

3. A fuel nozzle anti-fatigue testing apparatus as defined in claim 1, wherein: The outer wall of the middle blow shell (36) is fixedly connected to the outer wall of the support frame (1), and the outer wall of the support frame (1) is fixedly connected to the outer wall of the top blow shell (33).

4. The fuel nozzle fatigue testing apparatus of claim 1, wherein: The clamping assembly (2) includes a cylinder (21), and a sliding plate (22) is fixedly connected to the telescopic end of the cylinder (21). The inner walls on both sides of the sliding plate (22) are slidably connected to a fixed plate (25) through a limiting post (23), and the outer wall of the limiting post (23) is fixedly connected to the outer wall of the fixed plate (25).

5. A fuel nozzle anti-fatigue testing apparatus as defined in claim 4, wherein: Top springs (24) are fixedly connected to the outer walls on both sides of the fixed plate (25), the outer wall of the limiting post (23) is slidably connected to the inner wall of the sliding plate (22), the outer wall of the cylinder (21) is fixedly connected to the outer wall of the support frame (1), and the outer wall of the support frame (1) is fixedly connected to the outer wall of the fixed plate (25).

6. The fuel nozzle fatigue testing device according to claim 5, characterized in that: The top spring (24) is fixedly connected to the outer wall of the sliding plate (22) at the end away from the fixed plate (25). The outer walls of the fixed plate (25) and the sliding plate (22) are both fixedly connected to fixed posts (26), and the fixed posts (26) are arranged in a linear array along the outer wall of the fixed plate (25).

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