An oil injection nozzle with internal parts that can be easily replaced

Abstract

The utility model discloses an oil nozzle convenient to dismantle and replace internal aging parts, including fixed oil cylinder, the top fixed mounting of fixed oil cylinder has electric connector, the bottom of fixed oil cylinder is connected with the docking oil cylinder, the top mounting of fixed oil cylinder has the filter screen, the inside electric connection of fixed oil cylinder's electric connector has the solenoid, the inside joint of fixed oil cylinder has the sleeve, spring is contacted and is installed to one end of sleeve, the joint of one end of spring has needle valve, one end fixed connection of needle valve has metal cleaning rod, the inside of solenoid is provided with the magnetic core, one end of docking oil cylinder is installed with oil nozzle body subassembly of screw thread, the utility model provides an oil nozzle convenient to dismantle and replace internal aging parts through the joint structure of elastic dog and recessed slot, realizes fixed oil cylinder and docking oil cylinder quick assembly and disassembly, and the separate replacement of internal aging parts is convenient.

Description

Technical Field

[0001] This utility model relates to the technical field of automobiles, specifically to a fuel injector that facilitates the disassembly and replacement of aging internal parts. Background Technology

[0002] In the utility model patent application entitled "A Fuel Injector" with publication number CN220487749U and publication date of 2024-02-13, this utility model relates to the field of fuel injector technology and discloses a fuel injector. The nozzle includes a tube body one, a tube body two, and a wire harness connector. The end of tube body one extends into the interior of tube body two. Tube body one and tube body two form a channel. Tube body two is provided with an electromagnetic coil, an armature, a lower channel, a needle tube, a discharge hole, and a water inlet hole. The electromagnetic coil is sleeved on the end of tube body one. The lower channel of the armature is provided with a lower channel. The feed end of the lower channel of the armature is connected to the interior of tube body one. The armature and tube body one are connected by a tension spring. The discharge end of the lower channel of the armature is connected to the needle tube. This invention features a water inlet hole to allow hot water to be added, which improves the fluidity of the electromagnetic coil when energized, thus enhancing the operation of the fuel injector. Additionally, the structure of the fuel injector filter screen is primarily used to filter particulate impurities. The main characteristic of the fuel injector filter screen is its fine and uniform mesh, which promotes complete combustion.

[0003] In the prior art, including the aforementioned patents, fuel injectors are key components of the fuel injection system, and their performance directly affects the engine's fuel efficiency and emissions performance. Existing fuel injectors are mostly integrated structures or employ complex connection methods. When internal components (such as filters, springs, needle valves, etc.) age or wear due to long-term use, disassembly and replacement are cumbersome, requiring specialized tools and techniques. This not only increases maintenance costs but also extends equipment downtime. Furthermore, traditional fuel injectors have poor sealing performance and anti-loosening effects, easily leading to fuel leakage or loose connections, affecting operational safety and stability. Utility Model Content

[0004] The purpose of this utility model is to provide a fuel injector that facilitates the disassembly and replacement of internal aging parts, thereby solving the problem mentioned in the background art of achieving rapid disassembly and assembly of parts through optimized structural design, while ensuring good sealing performance and connection stability, reducing maintenance costs, and improving reliability.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a fuel injector that facilitates the disassembly and replacement of internally aged components, comprising a fixed oil cylinder, an electrical connector fixedly mounted on the top of the fixed oil cylinder, a docking oil cylinder engaged with the bottom of the fixed oil cylinder, a filter screen mounted on the top of the fixed oil cylinder, an electromagnetic coil electrically connected inside the electrical connector of the fixed oil cylinder, a sleeve engaged with the inside of the fixed oil cylinder, a spring mounted in contact with one end of the sleeve, a needle valve engaged with one end of the spring, a metal cleaning rod fixedly connected to one end of the needle valve, a magnetic core disposed inside the electromagnetic coil, a fuel injector body assembly threadedly mounted on one end of the docking oil cylinder, and an elastic claw fixedly connected to the bottom of the fixed oil cylinder.

[0006] Furthermore, a sealing O-ring is installed at the connection position between the fuel injector body assembly and the docking oil cylinder, and another set of sealing O-rings is provided at the engagement connection position between the filter screen and the sleeve. A fuel distribution pipe is fixedly connected to the inlet end of the fixed oil cylinder, and a fuel injector assembly is installed at one end of the fuel distribution pipe.

[0007] Furthermore, the injector body assembly includes a threaded valve seat, a nozzle, and an injection cylinder. One end of the injection cylinder is threaded with a threaded valve seat, the bottom of the threaded valve seat is fixedly connected to the nozzle, and the nozzle is internally engaged with the injection cylinder.

[0008] Furthermore, the outer wall of the fuel injection cylinder is provided with fuel injection holes, and the end of the metal cleaning rod away from the needle valve is provided with a detachable cleaning head, and the inner wall of the fuel injection cylinder is in flexible contact with the pressed metal cleaning rod.

[0009] Furthermore, the threaded connection between the docking oil cylinder and the threaded valve seat is provided with an anti-loosening structure. The anti-loosening structure includes an anti-loosening gasket sleeved on the outer wall of the threaded valve seat, and one side of the anti-loosening gasket is tightly fitted to the end of the docking oil cylinder.

[0010] Furthermore, the elastic claw is an elastic block, and the inner wall of the docking oil cylinder is provided with a recessed groove that matches the elastic claw, and the engagement surface of the elastic block and the recessed groove is inclined.

[0011] Furthermore, the filter screen has a detachable structure, and the top of the fixed oil cylinder is provided with an installation groove. The edge of the filter screen is connected to the installation groove by a locking strip.

[0012] Compared with the prior art, the beneficial effects of this utility model are: the fuel injector that facilitates disassembly and replacement of internal aging parts is reasonable and has the following advantages: (1) By engaging the elastic claw at the bottom of the fixed oil cylinder with the recessed groove on the inner wall of the docking oil cylinder, and by connecting the docking oil cylinder with the fuel injector body assembly by the threaded connection, the various parts of the fuel injector can be quickly separated. When internal parts such as springs, needle valves, and sleeves become aged, there is no need to replace the entire fuel injector. Only the corresponding connection parts need to be separated to remove the aged parts for replacement, which greatly reduces maintenance costs and maintenance difficulty and shortens the maintenance cycle. The threaded connection between the docking oil cylinder and the threaded valve seat is equipped with an anti-loosening gasket. One side of the anti-loosening gasket is tightly fitted with the end of the docking oil cylinder, which can prevent the threaded connection from loosening during long-term use, ensuring the stability of the connection between the fuel injector body assembly and the docking oil cylinder, and ensuring the stable working performance of the fuel injector. Secondly, while the installation is quick, sealing O-rings are provided at the connection position between the fuel injector body assembly and the docking oil cylinder, and at the engagement connection position between the filter screen and the sleeve, which can effectively prevent fuel leakage, ensure the normal operation of the fuel injector, and improve the reliability of the fuel injector. (2) In this utility model, a metal cleaning rod is fixedly connected to one end of the needle valve. The end of the rod away from the needle valve (8) is provided with a detachable cleaning head, and the inner wall of the fuel injector is in flexible contact with the pressed metal cleaning rod. When the fuel injector needs to be cleaned, the metal cleaning rod can be moved up and down by operating the needle valve, and the cleaning head can be used to clean the fuel injector. At the same time, the flexible contact will not damage the fuel injector. The detachable cleaning head is also convenient to replace after it is worn, ensuring the cleaning effect. Meanwhile, the filter screen is a detachable structure, and its edge is connected to the mounting groove on the top of the fixed fuel injector by a locking strip. When the filter screen is clogged or damaged, it can be quickly disassembled and replaced to ensure the fuel filtration effect and prevent impurities from entering the fuel injector and affecting its operation. Attached Figure Description

[0013] Figure 1 This is an overall drawing of the present utility model; Figure 2 This is a structural diagram of the fuel injector component. Figure 3 This is a cross-sectional view of the present invention; Figure 4 This is a schematic diagram of the structure of the electromagnetic coil and the electrical connector of this utility model; Figure 5 This is a schematic diagram of the structure of the filter screen and sleeve of this utility model; Figure 6 This is a schematic diagram of the structure of the fuel injector body assembly and the metal cleaning rod of this utility model.

[0014] In the diagram: 1. Fixed oil cylinder; 2. Electrical connector; 3. Connecting oil cylinder; 4. Filter screen; 5. Electromagnetic coil; 6. Sleeve; 7. Spring; 8. Needle valve; 9. Metal cleaning rod; 10. Magnetic core; 11. Injector body assembly; 1101. Threaded valve seat; 1102. Nozzle; 1103. Injector cylinder; 12. Elastic claw; 13. Sealing O-ring; 14. Fuel distribution pipe; 15. Injector assembly. Detailed Implementation

[0015] 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.

[0016] Please see Figure 1-6 The present invention provides a technical solution as follows: Example 1: A fuel injector with easily replaceable internal aging parts includes a fixed fuel cylinder 1. An electrical connector 2 is fixedly mounted on the top of the fixed fuel cylinder 1 for connection to an external circuit to provide power to the fuel injector. A docking fuel cylinder 3 is snap-fitted to the bottom of the fixed fuel cylinder 1, enabling quick assembly and disassembly. A filter screen 4 is installed on the top of the fixed fuel cylinder 1 to filter impurities in the fuel and prevent clogging of internal components. An electromagnetic coil 5 is electrically connected inside the electrical connector 2 of the fixed fuel cylinder 1. The electromagnetic coil 5 contains a magnetic... The core 10 controls the opening and closing of the needle valve 8 through electromagnetic induction; the sleeve 6 is internally engaged with the fixed oil cylinder 1, one end of the sleeve 6 is in contact with the spring 7, and the other end of the spring 7 is engaged with the needle valve 8, providing a reset force for the needle valve 8; a metal cleaning rod 9 is fixedly connected to one end of the needle valve 8 for cleaning the inner wall of the oil injection cylinder 1103 and the oil injection hole; an oil injector body assembly 11 is threadedly installed at one end of the docking oil cylinder 3, and an elastic claw 12 is fixedly connected to the bottom of the fixed oil cylinder 1 to achieve engagement and fixation with the docking oil cylinder 3.

[0017] Furthermore, a sealing O-ring 13 is installed at the connection position between the fuel injector body assembly 11 and the docking oil cylinder 3, and another set of sealing O-rings 13 is provided at the engagement connection position between the filter screen 4 and the sleeve 6. The overall sealing performance of the fuel injector is ensured by multiple sets of sealing O-rings 13 to prevent fuel leakage. A fuel distribution pipe 13 is fixedly connected to the inlet end of the fixed oil cylinder 1, and a fuel injector assembly 14 is installed at one end of the fuel distribution pipe 13.

[0018] Furthermore, the injector body assembly 11 internally includes a threaded valve seat 1101, a nozzle 1102, and an injector cartridge 1103. The threaded valve seat 1101 is threaded onto one end of the injector cartridge 3, and the nozzle 1102 is fixedly connected to the bottom of the threaded valve seat 1101. The injector cartridge 1103 is internally engaged with the nozzle 1102. This split-type structure design facilitates individual replacement of each component. The outer wall of the injector cartridge 1103 has an injection hole, and a detachable cleaning head is provided at the end of the metal cleaning rod 9 away from the needle valve 8. The inner wall of the cylinder 1103 flexibly contacts the pressed metal cleaning rod 9. During the movement of the needle valve 8, the metal cleaning rod 9 can clean the inner wall of the oil injection cylinder 1103 and the oil injection hole to prevent carbon buildup and blockage. At the same time, the cleaning head can be removed for easy replacement and maintenance. The threaded connection between the oil cylinder 3 and the threaded valve seat 1101 is provided with an anti-loosening structure. The anti-loosening structure includes an anti-loosening gasket sleeved on the outer wall of the threaded valve seat 1101, and one side of the anti-loosening gasket is tightly fitted with the end of the oil cylinder 3, which effectively prevents the threaded connection from loosening and ensures the stability of the connection.

[0019] Furthermore, the elastic claw 12 is an elastic locking block, and the inner wall of the connecting oil cylinder 3 has a recessed locking groove adapted to the elastic claw 12. The engaging surfaces of the elastic locking block and the recessed locking groove are inclined, which facilitates the quick engagement and disengagement of the fixed oil cylinder 1 and the connecting oil cylinder 3, improving disassembly efficiency. The filter screen 4 has a detachable structure, and the top of the fixed oil cylinder 1 has an installation groove. The edge of the filter screen 4 is engaged with the installation groove by a locking strip, which facilitates regular disassembly, cleaning, or replacement of the filter screen 4, ensuring the filtration effect. Working principle: When using this fuel injector, firstly, the electromagnetic coil 5 is connected to the external circuit through the electrical connector 2. When the engine needs fuel, the external circuit powers the electromagnetic coil 5, which generates electromagnetic force to attract the magnetic core 10. The magnetic core 10 drives the needle valve 8 to move upward against the elastic force of the spring 7, opening the fuel injection hole. The fuel filtered by the filter screen 4 passes through the fixed fuel cylinder 1, the docking fuel cylinder 3, the threaded valve seat 1101, and the nozzle 1102 in sequence into the fuel injection cylinder 1103. Finally, it is injected into the engine combustion chamber through the fuel injection hole on the outer wall of the fuel injection cylinder 1103. When the electromagnetic coil 5 is de-energized, the electromagnetic force disappears, the spring 7 returns to its deformation, pushes the needle valve 8 downward, closes the fuel injection hole, and stops fuel injection. Secondly, during the movement of the needle valve 8, the metal cleaning rod 9 will move synchronously, and the cleaning head on the metal cleaning rod 9 will clean the inner wall of the oil injection cylinder 1103. Finally, when the internal components of the fuel injector need to be replaced due to aging, first unscrew the fuel injector body assembly 11 and remove it from the docking cylinder 3. Then, apply external force to disengage the elastic claw 12 at the bottom of the fixing cylinder 1 from the recessed groove on the inner wall of the docking cylinder 3, separating the fixing cylinder 1 from the docking cylinder 3. After that, the filter screen 4, sleeve 6, spring 7, needle valve 8, and other components can be removed from inside the fixing cylinder 1. Replace the aged components. After replacement, assemble the components in reverse order.

[0020] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A fuel injector that facilitates the disassembly and replacement of internally aged parts, comprising a fixed fuel cylinder (1), characterized in that: An electrical connector (2) is fixedly installed on the top of the fixed oil cylinder (1). A docking oil cylinder (3) is engaged with the bottom of the fixed oil cylinder (1). A filter screen (4) is installed on the top of the fixed oil cylinder (1). An electromagnetic coil (5) is electrically connected inside the electrical connector (2) of the fixed oil cylinder (1). A sleeve (6) is engaged with the inside of the fixed oil cylinder (1). A spring (7) is installed in contact with one end of the sleeve (6). A needle valve (8) is engaged with one end of the spring (7). A metal cleaning rod (9) is fixedly connected to one end of the needle valve (8). A magnetic core (10) is provided inside the electromagnetic coil (5). An oil nozzle body assembly (11) is threadedly installed at one end of the docking oil cylinder (3). An elastic claw (12) is fixedly connected to the bottom of the fixed oil cylinder (1).

2. The fuel injector for easy disassembly and replacement of internal aged parts according to claim 1, characterized in that: A sealing O-ring (13) is installed at the connection position between the injector body assembly (11) and the docking oil cylinder (3), and another set of sealing O-rings (13) is provided at the engagement connection position between the filter screen (4) and the sleeve (6). A fuel distribution pipe (14) is fixedly connected to the inlet end of the fixed oil cylinder (1), and an injector assembly (15) is installed at one end of the fuel distribution pipe (14).

3. The fuel injector for easy disassembly and replacement of internal aged parts according to claim 1, characterized in that: The injector body assembly (11) includes a threaded valve seat (1101), a nozzle (1102), and an injector cylinder (1103). One end of the connecting cylinder (3) is threaded with a threaded valve seat (1101). The bottom of the threaded valve seat (1101) is fixedly connected to the nozzle (1102). The nozzle (1102) is engaged with the injector cylinder (1103) inside the nozzle (1102).

4. A fuel injector for easy disassembly and replacement of internal aged parts according to claim 3, characterized in that: The outer wall of the oil spray cylinder (1103) is provided with an oil spray hole, and the end of the metal cleaning rod (9) away from the needle valve (8) is provided with a detachable cleaning head, and the inner wall of the oil spray cylinder (1103) is in flexible contact with the pressed metal cleaning rod (9).

5. A fuel injector for easy disassembly and replacement of internal aged parts according to claim 3, characterized in that: The threaded connection between the docking oil cylinder (3) and the threaded valve seat (1101) is provided with an anti-loosening structure. The anti-loosening structure includes an anti-loosening gasket sleeved on the outer wall of the threaded valve seat (1101), and one side of the anti-loosening gasket is tightly fitted to the end of the docking oil cylinder (3).

6. A fuel injector for easy disassembly and replacement of internal aged parts according to claim 1, characterized in that: The elastic claw (12) is an elastic block, and the inner wall of the docking oil cylinder (3) is provided with a recessed groove that matches the elastic claw (12), and the engagement surface of the elastic block and the recessed groove is inclined.

7. A fuel injector for easy disassembly and replacement of internal aged parts according to claim 1, characterized in that: The filter screen (4) is a detachable structure. The top of the fixed oil cylinder (1) is provided with an installation groove. The edge of the filter screen (4) is connected to the installation groove by a locking strip.

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