A single-unit fuel injector

Abstract

This utility model relates to the field of fuel injector technology and discloses a single-unit fuel injector, including an injector body. A fuel delivery pipe is fixedly connected to the bottom of the injector body, and a filling pipe is fixedly connected to the top of the injector body. A filter frame is fixedly connected to the top of the filling pipe. A locking block is slidably connected inside the fuel delivery pipe, and a nozzle is fixedly connected to the bottom of the locking block. A disassembly assembly is provided inside the fuel delivery pipe. The disassembly assembly includes a trapezoidal locking pin slidably connected inside the fuel delivery pipe, and a sliding sleeve slidably connected to the outer wall of the fuel delivery pipe. In this utility model, through the cooperation of the sliding sleeve, spring, and trapezoidal locking pin in the disassembly assembly, the injector nozzle can be replaced promptly when worn or damaged, thereby extending the overall service life of the injector. This solves the problem of traditional injector nozzles being difficult to replace, leading to the complete scrapping of the injector, and improves the economy and practicality of the injector.

Description

Technical Field

[0001] This utility model relates to the field of fuel injector technology, and in particular to a single-unit fuel injector. Background Technology

[0002] As a core component of the internal combustion engine fuel system, the performance of the single-unit fuel injector directly affects the engine's combustion efficiency, emission levels, and operational stability. With increasingly stringent emission regulations and the development of engine technology towards higher efficiency and lower carbon emissions, injectors need to have higher injection precision, faster response speed, and longer service life. Traditional injectors typically adopt an integral design, with the nozzle and valve body fixed by welding or interference fit. Although this ensures sealing, under long-term high-pressure and high-frequency operating conditions, the nozzle is prone to failure due to fuel erosion or particulate wear. In addition, impurities in the fuel can exacerbate nozzle clogging or wear, further reducing injector reliability. Therefore, developing a single-unit injector that is easy to maintain and allows for quick replacement of key components has become an important research direction for improving engine durability and reducing operating costs.

[0003] Most existing fuel injectors use solenoid valves or piezoelectric crystals to drive needle valves, and control fuel injection through a precisely matched valve seat and needle valve. The nozzle is usually made of high-hardness alloy and has micron-level nozzles to achieve fuel atomization. Its connection with the valve body includes threaded fastening, laser welding or hot pressing assembly.

[0004] The core problem with traditional fuel injectors is that the nozzle and valve body are fixedly connected, such as by welding or interference fit. Once the nozzle becomes deformed or clogged due to long-term high-pressure injection or wear from fuel impurities, it is impossible to replace the nozzle alone. The entire fuel injector must be scrapped. This design not only increases the user's maintenance costs but also wastes resources. Especially in heavy machinery or high-load engines, the nozzle is a wear part that needs to be replaced frequently. The method of scrapping the whole unit significantly reduces the economy and practicality of the fuel injector. Therefore, a single-unit fuel injector is proposed to solve the above problems. Utility Model Content

[0005] To overcome the above shortcomings, this utility model provides a single-unit fuel injector, which aims to improve the problem of the difficulty in replacing the injector nozzle in the prior art, which leads to the scrapping of the entire injector.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A single-unit fuel injector includes an injector body, a fuel supply pipe fixedly connected to the bottom of the injector body, a filling pipe fixedly connected to the top of the injector body, a filter frame fixedly connected to the top of the filling pipe, a locking block slidably connected inside the fuel supply pipe, a nozzle fixedly connected to the bottom of the locking block, and a disassembly assembly provided inside the fuel supply pipe.

[0008] The disassembly assembly includes a trapezoidal locking post slidably connected inside the oil pipeline, a sliding sleeve slidably connected to the outer wall of the oil pipeline, a groove being provided inside the sliding sleeve, a spring being fitted onto the outer wall of the oil pipeline, one end of the spring being fixedly connected to the outer wall of the oil pipeline, and the other end of the spring being fixedly connected to the inner wall of the sliding sleeve, and a filter assembly being provided inside the filter frame.

[0009] As a further description of the above technical solution:

[0010] The filter assembly includes a sealing frame and a filter screen. The sealing frame is slidably connected inside the filter frame, the filter screen is fixedly connected to the inner wall of the sealing frame, and a handle is fixedly connected to the outer wall of the sealing frame.

[0011] As a further description of the above technical solution:

[0012] A hollow column is fixedly connected to the outer wall of the filter frame, and a T-shaped groove is formed on the outer wall of the hollow column.

[0013] As a further description of the above technical solution:

[0014] The hollow column is slidably connected to a locking rod, one end of which engages with the sealing frame.

[0015] As a further description of the above technical solution:

[0016] A fixed plate is fixedly connected to the inner wall of the hollow column, and the clamping rod is slidably connected inside the fixed plate.

[0017] As a further description of the above technical solution:

[0018] A sliding disk is slidably connected to the inner wall of the hollow column, and a pull handle is fixedly connected to the top of the sliding disk. The pull handle is slidably connected inside the T-slot.

[0019] As a further description of the above technical solution:

[0020] The hollow column is slidably connected to a second sliding disk, and one end of the clamping rod is fixedly connected to a limit disk, while the clamping rod is slidably connected inside the second sliding disk.

[0021] As a further description of the above technical solution:

[0022] The outer wall of the lever is fitted with a second spring. One end of the second spring is fixedly connected to the side wall of the sliding disc, and the other end of the second spring is fixedly connected to the inner wall of the hollow column.

[0023] This utility model has the following beneficial effects:

[0024] 1. In this utility model, by disassembling the sliding sleeve, spring 1 and trapezoidal locking post in the assembly, the locking block is driven to slide in the oil supply pipe. Then, the locking block drives the nozzle to achieve quick disassembly and installation, so that the injector nozzle can be replaced in time when it is worn or damaged, thereby extending the overall service life of the injector. This solves the problem that the traditional injector nozzle is difficult to replace, which leads to the scrapping of the entire injector, and improves the economy and practicality of the injector.

[0025] 2. In this utility model, the sealing frame and filter screen in the filter assembly drive the filtration of fuel entering the injector. Then, the positioning mechanism of the pull handle, the locking rod and the second spring facilitates the easy removal and installation of the filter screen. This allows the filter screen to be quickly cleaned or replaced after it becomes clogged, thereby achieving the effect of continuously ensuring fuel cleanliness. This solves the problem of fuel impurities affecting the performance and lifespan of the injector, and improves the stability and reliability of the injector's operation. Attached Figure Description

[0026] Figure 1 This is a three-dimensional schematic diagram of a single-unit fuel injector proposed in this utility model.

[0027] Figure 2 This is a schematic diagram of the filter frame structure of a single-unit fuel injector proposed in this utility model.

[0028] Figure 3 for Figure 2 Enlarged view of point A in the middle;

[0029] Figure 4 A schematic diagram of a hollow column structure for a single-unit fuel injector proposed in this utility model;

[0030] Figure 5 This is a schematic diagram of the sealing frame structure of a single-unit fuel injector proposed in this utility model;

[0031] Figure 6 for Figure 5 Enlarged view of point B in the middle.

[0032] Legend:

[0033] 1. Injector body; 2. Oil supply pipe; 3. Injection pipe; 4. Filter frame; 5. Sliding sleeve; 6. Spring 1; 7. Trapezoidal locking post; 8. Groove; 9. Locking block; 10. Nozzle; 11. Sealing frame; 12. Filter screen; 13. Hollow column; 14. T-slot; 15. Handle; 16. Locking rod; 17. Sliding disc 1; 18. Pull handle; 19. Sliding disc 2; 20. Limiting disc; 21. Spring 2; 22. Fixing disc. Detailed Implementation

[0034] 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.

[0035] Reference Figures 1-6 An embodiment of this utility model is provided: a single-unit fuel injector, including an injector body 1, a fuel supply pipe 2 fixedly connected to the bottom of the injector body 1 for supplying high-pressure fuel to the nozzle 10, a fuel injection pipe 3 fixedly connected to the top of the injector body 1 for receiving fuel supply, a filter frame 4 fixedly connected to the top of the fuel injection pipe 3 for initially filtering impurities in the fuel, a locking block 9 slidably connected inside the fuel supply pipe 2 for fixing and driving the nozzle 10 to move, a nozzle 10 fixedly connected to the bottom of the locking block 9 for fuel atomization injection, and a disassembly assembly provided inside the fuel supply pipe 2 for quick disassembly and assembly of the nozzle 10;

[0036] The disassembly assembly includes a trapezoidal locking pin 7 for engaging with a locking block 9 to lock and unlock. The trapezoidal locking pin 7 is slidably connected inside the fuel supply pipe 2. A sliding sleeve 5 is slidably connected to the outer wall of the fuel supply pipe 2 for moving the trapezoidal locking pin 7. A groove 8 is provided inside the sliding sleeve 5 to accommodate the displacement of the trapezoidal locking pin 7. A spring 6 is fitted on the outer wall of the fuel supply pipe 2 to provide the restoring force of the sliding sleeve 5. One end of the spring 6 is fixedly connected to the outer wall of the fuel supply pipe 2, and the other end of the spring 6 is fixedly connected to the inner wall of the sliding sleeve 5. A filter assembly is provided inside the filter frame 4 for secondary fine filtration of the fuel.

[0037] Reference Figures 1-6The filter assembly includes a sealing frame 11 for fixing the filter screen 12 and ensuring the airtightness of the filter frame 4. The sealing frame 11 is slidably connected inside the filter frame 4 for easy disassembly and maintenance. The filter screen 12 is fixedly connected to the inner wall of the sealing frame 11 for filtering impurities in the fuel. A handle 15 is fixedly connected to the outer wall of the sealing frame 11 for easy operation of pulling the sealing frame 11. A hollow column 13 is fixedly connected to the outer wall of the filter frame 4 for installing the locking rod 16 mechanism. A T-slot 14 is provided on the outer wall of the hollow column 13 to limit the movement trajectory of the pull handle 18. A locking rod 16 is slidably connected inside the hollow column 13 for locking or releasing the sealing frame 11. One end of the locking rod 16 engages with the sealing frame 11 to achieve a fixing function. A fixing plate 22 is fixedly connected to the inner wall of the hollow column 13 to support the locking rod 16 and maintain its movement stability. 16 is slidably connected inside the fixed disk 22 to ensure linear motion. A sliding disk 17 is slidably connected to the inner wall of the hollow column 13 to transmit operating force. A pull handle 18 is fixedly connected to the top of the sliding disk 17 for manual operation of the lever 16. The pull handle 18 is slidably connected inside the T-slot 14 to achieve a guiding function. A sliding disk 29 is slidably connected inside the hollow column 13 to compress the spring 21. One end of the lever 16 is fixedly connected to a limit disk 20 to limit the stroke of the lever 16. The lever 16 is slidably connected inside the sliding disk 29 to ensure coaxial motion. A spring 21 is sleeved on the outer wall of the lever 16 to provide the return elasticity of the lever 16. One end of the spring 21 is fixedly connected to the side wall of the sliding disk 29, and the other end of the spring 21 is fixedly connected to the inner wall of the hollow column 13 to form an elastic support structure.

[0038] Working principle: When the single-unit fuel injector is working, fuel enters through the injection pipe 3. The filter frame 4, which is fixedly connected to the top of the injection pipe 3, performs preliminary filtration of the fuel. The filter assembly consists of a sealing frame 11 and a filter screen 12 inside the filter frame 4. The filter screen 12 is fixedly connected to the inner wall of the sealing frame 11. The handle 15, which is fixedly connected to the outer wall of the sealing frame 11, facilitates operation. When the filter screen 12 needs to be cleaned or replaced, pull the handle 18 fixed to the top of the sliding disc 17. The handle 18 slides in the T-slot 14 on the outer wall of the hollow column 13, causing the sliding disc 17 to slide on the inner wall of the hollow column 13. The sliding disc 17 pushes the locking rod 16 to overcome the elastic force of the spring 21, causing one end of the locking rod 16 to disengage from the sealing frame 11. At this time, the sealing frame 11 can be pulled out from inside the filter frame 4 through the handle 15. The filtered fuel then passes through the injection pipe. Pipe 3 enters the injector body 1, and then flows to the nozzle 10 through the fuel supply pipe 2 fixedly connected to the bottom of the injector body 1. The nozzle 10 is connected to the fuel supply pipe 2 through the locking block 9. The locking block 9 slides inside the fuel supply pipe 2. When it is necessary to remove the nozzle 10, slide the sliding sleeve 5 on the outer wall of the fuel supply pipe 2 upward. The groove 8 opened inside the sliding sleeve 5 disengages from the trapezoidal locking post 7. The trapezoidal locking post 7 slides inside the fuel supply pipe 2, releasing the restriction on the locking block 9. The locking block 9 can then drive the nozzle 10 out of the fuel supply pipe 2, completing the removal. During the removal process, the spring 6 is compressed. During installation, insert the nozzle 10 and the locking block 9 into the fuel supply pipe 2, loosen the sliding sleeve 5, and the sliding sleeve 5 returns to its original position under the elastic force of the spring 6. The groove 8 re-locks the trapezoidal locking post 7, thus fixing the nozzle 10. This allows the injector to easily replace the nozzle 10 and effectively filter the fuel.

[0039] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A single-unit fuel injector, comprising an injector body (1), characterized in that: The bottom of the injector body (1) is fixedly connected to an oil supply pipe (2), the top of the injector body (1) is fixedly connected to an oil injection pipe (3), the top of the oil injection pipe (3) is fixedly connected to a filter frame (4), a locking block (9) is slidably connected inside the oil supply pipe (2), a nozzle (10) is fixedly connected to the bottom of the locking block (9), and a disassembly assembly is provided inside the oil supply pipe (2). The disassembly assembly includes a trapezoidal locking post (7), which is slidably connected inside the oil pipe (2). A sliding sleeve (5) is slidably connected to the outer wall of the oil pipe (2). A groove (8) is provided inside the sliding sleeve (5). A spring (6) is fitted on the outer wall of the oil pipe (2). One end of the spring (6) is fixedly connected to the outer wall of the oil pipe (2), and the other end of the spring (6) is fixedly connected to the inner wall of the sliding sleeve (5). A filter assembly is provided inside the filter frame (4).

2. A single-unit fuel injector according to claim 1, characterized in that: The filter assembly includes a sealing frame (11) and a filter screen (12). The sealing frame (11) is slidably connected inside the filter frame (4). The filter screen (12) is fixedly connected to the inner wall of the sealing frame (11). A handle (15) is fixedly connected to the outer wall of the sealing frame (11).

3. A single-unit fuel injector according to claim 2, characterized in that: The outer wall of the filter frame (4) is fixedly connected to a hollow column (13), and a T-shaped groove (14) is opened on the outer wall of the hollow column (13).

4. A single-unit fuel injector according to claim 3, characterized in that: The hollow column (13) is slidably connected to a locking rod (16), one end of which engages with the sealing frame (11).

5. A single-unit fuel injector according to claim 4, characterized in that: The hollow column (13) has a fixed plate (22) fixedly connected to its inner wall, and the clamping rod (16) is slidably connected inside the fixed plate (22).

6. A single-unit fuel injector according to claim 5, characterized in that: The hollow column (13) has a sliding disk (17) slidably connected to its inner wall. The top of the sliding disk (17) is fixedly connected to a pull handle (18), which is slidably connected inside the T-slot (14).

7. A single-unit fuel injector according to claim 6, characterized in that: The hollow column (13) is slidably connected to a sliding disk two (19), and one end of the clamping rod (16) is fixedly connected to a limiting disk (20). The clamping rod (16) is slidably connected inside the sliding disk two (19).

8. A single-unit fuel injector according to claim 7, characterized in that: The outer wall of the lever (16) is fitted with a spring (21), one end of which is fixedly connected to the side wall of the sliding disk (19), and the other end of which is fixedly connected to the inner wall of the hollow column (13).

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