An integrated fuel injector with adjustable rate

Abstract

The present invention provides an integrated fuel injector with adjustable rate for use in the field of fuel injectors. The present invention adopts the structural design between the fuel injector valve needle and the main housing. When the oil pressure of the oil inlet pipeline changes, the oil supply tank also changes when it is transmitted to the regulating bag through the regulating oil circuit. When the oil pressure increases, the expansion amount of the regulating bag increases, thereby increasing the elastic potential energy stored in the first tensioning spring. Therefore, when the upper pressure chamber is closed, the speed at which the fuel injector valve needle moves upward using the oil pressure in the lower pressure chamber is reduced, thereby avoiding the phenomenon of excessive high-pressure fuel injection. Similarly, when the oil pressure decreases, the expansion amount of the regulating bag decreases, and the elastic potential energy stored in the first tensioning spring decreases, thereby reducing the upward resistance of the fuel injector valve needle, thereby increasing its upward movement speed, thereby avoiding the phenomenon of insufficient low-pressure fuel injection. The present invention has a simple structure, can autonomously adjust the fuel injection rate according to the oil pressure of the oil circuit, so as to achieve the purpose of reducing energy consumption. It has market prospects and is suitable for popularization and application.

Description

Technical Field

[0001] The present application relates to the field of fuel injectors, and in particular to an integrated fuel injector with adjustable speed. Background Art

[0002] Integrated fuel injectors have the advantages of flexible control, fast response, and high control accuracy. However, with increasingly stringent emission regulations, the combustion and emission performance requirements of diesel engines have put forward higher requirements on the control of fuel injection systems. Higher injection pressure, faster response speed, more flexible and controllable injection rules will be the development trend of diesel engine fuel injection systems in the future.

[0003] The ideal diesel engine injection pattern can often be adjusted according to the operating characteristics and performance requirements of the entire machine. For example, in the operating range of the diesel engine with a larger speed, a single main injection can meet the power requirements of the entire machine. However, in the operating range of the diesel engine with a smaller speed, the economic performance and emission performance of the entire machine decrease, and the noise is serious. At this time, a suitable injection method is needed to optimize the combustion in the cylinder, thereby reducing fuel consumption and noise, and reducing the emission of particulate matter and nitrogen oxides.

[0004] When a large amount of fuel needs to be injected in a short period of time for cylinder combustion, the existing injector can increase the oil return rate of the control chamber and accelerate the opening of the needle valve by increasing the diameter of the return oil throttle hole, but at the same time it will increase the amount of controlled return oil, thereby reducing the hydraulic efficiency of the fuel system and the economy of the diesel engine. In the prior art, high and low pressure oil supply is achieved by setting up multiple pumps. This method makes the variable injection rate system structure complex, increases manufacturing costs, and increases reliability failures. In addition, when switching between high and low pressures, the response speed of the fuel supply pump is slow, resulting in a decrease in engine performance. For this reason, we propose an integrated injector with adjustable rate to solve the above problems. Summary of the invention

[0005] The purpose of the present application is to design an integrated fuel injector, which can automatically adjust the injection rate according to the change of the fuel supply oil pressure, so as to achieve the purpose of stable operation of the internal combustion engine and reduce energy consumption. Compared with the prior art, an integrated fuel injector with adjustable rate is provided, through the design of the main housing and the nozzle, wherein the nozzle is fixed to the bottom end of the main housing by a locking sleeve, the top of the main housing is detachably connected with a top cover, an oil supply tank is provided inside the main housing, a fuel injection nozzle valve needle is slidably connected in the nozzle along its axial direction, a fuel injection nozzle matching the fuel injection nozzle valve needle is provided at the bottom of the nozzle, and the nozzle is provided with an upper pressure tank and a lower pressure tank at the top and bottom of the fuel injection nozzle valve needle respectively;

[0006] The top of the upper pressure chamber is slidably connected with an adjusting ring along its axial direction, an adjusting capsule is clamped between the adjusting ring and the upper pressure chamber, and a first tensioning spring is clamped between the injector valve needle and the adjusting ring;

[0007] An oil inlet pipeline for providing oil pressure to the oil supply tank is provided on one side of the main shell body. One side of the oil supply tank is connected with the lower pressure tank through a supply oil circuit. The output end of the supply oil circuit is connected with the upper pressure tank through a shunt pipe. The other side of the oil supply tank is connected with the regulating bladder through a regulating oil circuit. An actuator is provided between the oil supply tank and the upper pressure tank, and the actuator is used to block the shunt pipe.

[0008] Furthermore, the actuator includes an electromagnetic ring fixed between the oil supply tank and the upper pressure tank, a permanent magnetic rod matching the electromagnetic ring is slidably connected inside the electromagnetic ring, the top end of the permanent magnetic rod extends into the oil supply tank and a second tensioning spring is clamped between the oil supply tank, a connecting rod is fixed to the bottom end of the permanent magnetic rod, and a sealing groove corresponding to the bottom end of the connecting rod is provided between the connecting node of the shunt pipe and the upper pressure tank.

[0009] Furthermore, an upper valve core and a lower valve core which are symmetrically arranged up and down are fixed to the bottom end of the connecting rod, and a valve seat which matches the upper valve core and the lower valve core one by one is arranged in the main housing.

[0010] Furthermore, the upper valve core and the lower valve core are conical valve core structures, and the cone tips of the upper valve core and the lower valve core are arranged opposite to each other. When the connecting rod moves upward, the lower valve core is sealed with its valve seat, and when the connecting rod moves downward, the upper valve core is sealed with its valve seat.

[0011] Furthermore, the second tensioning spring is a high-strength fatigue-resistant spring structure. The second tensioning spring has an elastic force that drives the connecting rod to move upward away from the blocking groove. When powered, the electromagnetic ring has a magnetic repulsion force that drives the permanent magnetic rod to move downward and drives the bottom end of the connecting rod to engage the blocking groove.

[0012] Furthermore, the first tensioning spring is a high-strength anti-fatigue spring structure, and the first tensioning spring has an elastic force that drives the fuel injection nozzle valve needle to move downward and seal the fuel injection nozzle.

[0013] Furthermore, the expansion amount of the regulating bladder is proportional to the oil pressure of the oil inlet pipeline.

[0014] Furthermore, a filter is fixed to the bottom end of the top cover, and the output end of the oil inlet pipeline extends into the filter and provides oil pressure for the oil supply tank.

[0015] Furthermore, two sets of sealing rings are provided on the top of the filter, the outer diameter of the sealing rings is not less than the inner diameter of the oil supply tank, and the two sets of sealing rings form an annular enclosed space between the outer wall of the filter and the inner wall of the oil supply tank. The filter is provided with a connecting hole on one side of the annular enclosed space, and the output end of the oil inlet pipeline extends into the annular enclosed space.

[0016] Furthermore, the permanent magnetic rod extends to the top of the oil supply tank and is fixed with a hydraulic sensor. The top cover is provided with a wiring terminal. The hydraulic sensor and the electromagnetic ring are connected to the ECU through the wiring terminal.

[0017] Compared with the prior art, the advantages of this application are:

[0018] (1) The present invention cooperates with the main housing with the oil inlet pipeline, oil supply tank, regulating oil circuit, feed oil circuit and shunt pipe. In actual use, when the actuator is not powered on, the permanent magnetic rod moves upward under the elastic force of the second tensioning spring, so that the bottom end of the connecting rod is separated from the blocking groove, and the shunt pipe is opened. At this time, the oil pressure in the oil supply tank is shunted to the upper pressure tank and the lower pressure tank through the feed oil circuit and the shunt pipe. The oil pressure in the upper pressure tank and the lower pressure tank is the same, and the nozzle needle moves downward under the elastic force of the first tensioning spring and blocks the nozzle.

[0019] (2) When the actuator is energized, the permanent magnet rod overcomes the elastic force of the second tensioning spring and moves downward under the magnetic attraction of the electromagnetic ring, causing the bottom end of the connecting rod to fit into the blocking groove. At this time, the shunt pipe is closed, the oil pressure in the upper pressure chamber disappears, and the oil pressure in the lower pressure chamber lifts the injector valve needle to overcome the elastic force of the first tensioning spring and move upward, thereby realizing the action of the injector opening and spraying.

[0020] (3) When the valve needle of the fuel injector moves downward and is closed, when the oil pressure of the oil inlet pipeline changes, the oil supply tank also changes when it is transmitted to the regulating bladder through the regulating oil circuit. When the oil pressure increases, the expansion amount of the regulating bladder increases, pushing the regulating ring to compress the first tensioning spring, thereby increasing the elastic potential energy stored in it. Therefore, when the upper pressure chamber is closed and pressure is lost, the speed at which the valve needle of the fuel injector moves upward using the oil pressure of the lower pressure chamber is reduced, thereby avoiding the phenomenon of excessive high-pressure fuel injection. Similarly, when the oil pressure decreases, the expansion amount of the regulating bladder decreases, and the elastic potential energy stored in the first tensioning spring decreases, thereby reducing the resistance of the valve needle of the fuel injector to move upward, thereby increasing its upward speed, thereby avoiding the phenomenon of insufficient low-pressure fuel injection. The present invention has a simple structure and can autonomously adjust the injection rate according to the oil pressure of the oil circuit to achieve the purpose of reducing energy consumption. It has market prospects and is suitable for promotion and application.

[0021] (4) Through the design of a connecting rod with an upper valve core and a lower valve core, when the connecting rod is driven by the permanent magnet rod to move in the up and down directions, it can effectively seal the oil supply tank and the upper pressure tank, and maintain the airtight isolation between the two in real time, thereby effectively preventing the oil pressure in the oil supply tank from directly affecting the oil pressure in the upper pressure tank, thereby improving the timeliness and effectiveness of the actuator's execution.

[0022] (5) The filter design with sealing ring and connecting holes allows the oil supply from the oil inlet pipeline to be filtered twice by the filter and then flow into the oil supply tank, thereby preventing the tiny unfiltered particles in the oil from entering the injector and causing the internal parts of the injector to wear more severely, effectively improving the service life of the injector. At the same time, the filter is installed on the top cover. During maintenance, only the top cover needs to be removed and the filter replaced to clean the impurities in the filter, making maintenance convenient and efficient.

[0023] (6) Through the design of a permanent magnet rod with a hydraulic sensor, the hydraulic sensor can monitor the oil pressure data transmitted from the oil inlet pipeline to the oil supply tank in real time, and then feed it back to the ECU. The ECU adaptively adjusts the power intensity of the electromagnetic ring according to the oil pressure intensity, thereby satisfying that the displacement rate of the permanent magnet rod is inversely proportional to the oil pressure intensity in the oil supply tank. The lower the oil pressure, the stronger the magnetic attraction of the electromagnetic ring to the permanent magnet rod, and the faster the displacement rate, thereby satisfying the high-speed injection effect under low oil pressure. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic diagram of the front structure of this application;

[0025] Figure 2 This is a schematic diagram of the bottom structure of this application;

[0026] Figure 3 This is a schematic diagram of the explosion structure of this application;

[0027] Figure 4 It is a schematic diagram of the exploded structure of the fuel injection nozzle valve needle and its components proposed in this application;

[0028] Figure 5 It is a schematic diagram of the structure of the actuator and its components proposed in this application;

[0029] Figure 6 It is a schematic diagram of the cross-sectional structure of the main shell proposed in this application;

[0030] Figure 7 It is a schematic diagram of the cross-sectional structure of this application;

[0031] Figure 8 for Figure 7 A schematic diagram of the enlarged structure of the middle part A;

[0032] Fig. 9 It is a schematic diagram of the structure of the top cover proposed in this application;

[0033] Fig.10 This is a schematic diagram of the internal oil circuit when the valve needle of the fuel injection nozzle proposed in this application moves down and closes;

[0034] Fig.11 A schematic diagram of the internal oil circuit when the valve needle of the fuel injection nozzle proposed in this application moves upward to open;

[0035] Fig.12 This is a schematic diagram of the state of the adjustment capsule proposed in this application adjusting the compression amount of the first tensioning spring.

[0036] Description of the numbers in the figure:

[0037] Main housing 1, oil inlet pipeline 11, oil supply tank 12, regulating oil circuit 13, feed oil circuit 14, shunt pipe 141, upper pressure tank 15, valve seat 16, blocking groove 17, top cover 2, wiring terminal 21, filter screen 22, sealing ring 23, connecting hole 24, locking sleeve 3, spray head 4, fuel injection nozzle 41, lower pressure tank 42, fuel injection nozzle valve needle 5, first tensioning spring 51, adjusting ring 52, adjusting capsule 53, electromagnetic ring 6, actuator 7, permanent magnet rod 71, second tensioning spring 72, connecting rod 73, lower valve core 731, upper valve core 732, hydraulic sensor 74. Implementation

[0038] The embodiments will be combined with the drawings in the specification to clearly and completely describe the technical solution of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making any creative work shall fall within the scope of protection of the present application. Example

[0039] The present invention provides an integrated fuel injector with adjustable speed. Figure 1-12 , including a main housing 1 and a nozzle 4, the nozzle 4 is fixed to the bottom end of the main housing 1 by a locking sleeve 3, the top of the main housing 1 is detachably connected with a top cover 2, an oil supply tank 12 is arranged inside the main housing 1, a nozzle valve needle 5 is slidably connected inside the nozzle 4 along its axial direction, a nozzle 41 matching the nozzle valve needle 5 is arranged at the bottom of the nozzle 4, and an upper pressure tank 15 and a lower pressure tank 42 are respectively arranged at the top and bottom of the nozzle valve needle 5 of the nozzle 4; an adjusting ring 52 is slidably connected to the top of the upper pressure tank 15 along its axial direction, and a clamping connection is formed between the adjusting ring 52 and the upper pressure tank 15 There is an adjusting capsule 53, and a first tensioning spring 51 is clamped between the injector valve needle 5 and the adjusting ring 52; one side of the main shell 1 is provided with an oil inlet pipeline 11 for providing oil pressure to the oil supply tank 12, one side of the oil supply tank 12 is connected with the lower pressure tank 42 through a supply oil circuit 14, and the output end of the supply oil circuit 14 is connected with the upper pressure tank 15 through a shunt pipe 141, and the other side of the oil supply tank 12 is connected with the adjusting capsule 53 through an adjusting oil circuit 13, and an actuator 7 is provided between the oil supply tank 12 and the upper pressure tank 15, and the actuator 7 is used to block the shunt pipe 141.

[0040] It should be noted that, in the present embodiment, the actuator 7 includes an electromagnetic ring 6 fixed between the oil supply tank 12 and the upper pressure tank 15, and a permanent magnetic rod 71 matching with it is slidably connected inside the electromagnetic ring 6. The top end of the permanent magnetic rod 71 extends into the oil supply tank 12 and a second tensioning spring 72 is clamped between the oil supply tank 12. A connecting rod 73 is fixed to the bottom end of the permanent magnetic rod 71, and a sealing groove 17 corresponding to the bottom end of the connecting rod 73 is provided between the connecting node of the shunt pipe 141 and the upper pressure tank 15.

[0041] Among them, the bottom end of the connecting rod 73 is fixed with an upper valve core 732 and a lower valve core 731 which are symmetrically arranged in the upper and lower parts. A valve seat 16 which matches the upper valve core 732 and the lower valve core 731 one by one is provided in the main shell 1. The upper valve core 732 and the lower valve core 731 are conical valve core structures, and the cone tips of the upper valve core 732 and the lower valve core 731 are arranged opposite to each other. When the connecting rod 73 moves upward, the lower valve core 731 is sealed with its valve seat 16. When the connecting rod 73 moves downward, the upper valve core 732 is sealed with its valve seat 16.

[0042] By designing the connecting rod 73 with the upper valve core 732 and the lower valve core 731, when the connecting rod 73 is displaced in the up and down directions under the drive of the permanent magnet rod 71, it can effectively seal the oil supply tank 12 and the upper pressure tank 15, and maintain the airtight isolation between the two in real time, thereby effectively preventing the oil pressure in the oil supply tank 12 from directly affecting the oil pressure in the upper pressure tank 15, thereby improving the timeliness and effectiveness of the actuator 7 when executing the action.

[0043] Furthermore, in the present embodiment, the second tensioning spring 72 is a high-strength anti-fatigue spring structure, and the second tensioning spring 72 has an elastic force to drive the connecting rod 73 to move upward away from the blocking groove 17. The electromagnetic ring 6 has a magnetic repulsion force to drive the permanent magnet rod 71 to move downward and drive the bottom end of the connecting rod 73 to engage with the blocking groove 17 under power-on conditions. The first tensioning spring 51 is a high-strength anti-fatigue spring structure, and the first tensioning spring 51 has an elastic force to drive the injector valve needle 5 to move downward and block the injector 41. The expansion amount of the regulating sac 53 is proportional to the oil pressure of the oil inlet pipeline 11.

[0044] The present invention cooperates with the main housing 1 with the oil inlet pipeline 11, the oil supply bin 12, the regulating oil circuit 13, the feed oil circuit 14, and the shunt pipe 141. In actual use, when the actuator 7 is not powered on, the permanent magnetic rod 71 moves upward under the elastic force of the second tensioning spring 72, so that the bottom end of the connecting rod 73 is separated from the blocking groove 17, and the shunt pipe 141 is opened. At this time, the oil pressure in the oil supply bin 12 is shunted to the upper pressure bin 15 and the lower pressure bin 42 through the feed oil circuit 14 and the shunt pipe 141. The oil pressures in the upper pressure bin 15 and the lower pressure bin 42 are the same, and the nozzle needle 5 moves downward under the elastic force of the first tensioning spring 51, and blocks the nozzle 41.

[0045] When the actuator 7 is powered on, the permanent magnet rod 71 overcomes the elastic force of the second tensioning spring 72 and moves downward under the magnetic attraction of the electromagnetic ring 6, so that the bottom end of the connecting rod 73 is engaged in the blocking groove 17. At this time, the shunt pipe 141 is closed, the oil pressure in the upper pressure chamber 15 disappears, and the oil pressure in the lower pressure chamber 42 lifts the injector valve needle 5 to overcome the elastic force of the first tensioning spring 51 and move upward, so that the injector 41 starts to spray oil;

[0046] When the oil pressure of the oil inlet pipe 11 changes, the oil supply tank 12 also changes when it is transmitted to the regulating bag 53 through the regulating oil circuit 13. When the oil pressure increases, the expansion amount of the regulating bag 53 increases, pushing the regulating ring 52 to compress the first tensioning spring 51, thereby increasing the elastic potential energy stored in it. Therefore, when the upper pressure chamber 15 is closed and pressure is lost, the speed at which the oil injector valve needle 5 moves upward using the oil pressure of the lower pressure chamber 42 is reduced, thereby avoiding the phenomenon of excessive high-pressure oil injection. Similarly, when the oil pressure decreases, the expansion amount of the regulating bag 53 decreases, and the elastic potential energy stored in the first tensioning spring 51 is reduced, which reduces the upward resistance of the oil injector valve needle 5, thereby increasing its upward movement speed, thereby avoiding the phenomenon of insufficient low-pressure oil injection. The present invention has a simple structure and can autonomously adjust the injection rate according to the oil pressure of the oil circuit to achieve the purpose of reducing energy consumption. It has market prospects and is suitable for promotion and application. Example

[0047] The present invention provides an integrated fuel injector with adjustable speed. Figure 1-12 , wherein the components identical or corresponding to those in Embodiment 1 are marked with the corresponding reference numerals in Embodiment 1. For the sake of simplicity, only the differences from Embodiment 1 are described below:

[0048] A filter screen 22 is fixed to the bottom end of the top cover 2, and the output end of the oil inlet pipeline 11 extends into the filter screen 22 and provides oil pressure for the oil supply bin 12, wherein two sets of sealing rings 23 are provided on the top of the filter screen 22, and the outer diameter of the sealing ring 23 is not less than the inner diameter of the oil supply bin 12, and the two sets of sealing rings 23 form an annular closed space between the outer wall of the filter screen 22 and the inner wall of the oil supply bin 12, and the filter screen 22 is provided with a connecting hole 24 on one side of the annular closed space, and the output end of the oil inlet pipeline 11 extends into the annular closed space.

[0049] Through the design of the filter 22 with a sealing ring 23 and a connecting hole 24, the oil supply of the oil inlet pipeline 11 will be filtered twice by the filter 22 and then flow into the oil supply tank 12, thereby preventing small unfiltered particles in the oil from entering the interior of the injector and causing increased wear of the internal parts of the injector, thereby effectively improving the service life of the injector. At the same time, through the design that the filter 22 is installed on the top cover 2, during maintenance, it is only necessary to remove the top cover 2 and replace the filter 22 to clean the impurities in the filter 22, and the maintenance is convenient and efficient.

[0050] Furthermore, in this embodiment, the permanent magnetic rod 71 extends to the top of the oil supply tank 12 and a hydraulic sensor 74 is fixed thereon. A wiring terminal 21 is provided on the top cover 2. The hydraulic sensor 74 and the electromagnetic ring 6 are connected to the ECU via the wiring terminal 21.

[0051] Through the design of the permanent magnet rod 71 with a hydraulic sensor 74, the oil pressure data transmitted from the oil inlet pipeline 11 to the oil supply tank 12 can be monitored in real time through the hydraulic sensor 74, and then fed back to the ECU. The ECU adaptively adjusts the power intensity of the electromagnetic ring 6 according to the oil pressure intensity, thereby satisfying that the displacement rate of the permanent magnet rod 71 is inversely proportional to the oil pressure intensity in the oil supply tank 12. The lower the oil pressure, the stronger the magnetic attraction of the electromagnetic ring 6 to the permanent magnet rod 71, and the faster the displacement rate, thereby satisfying the high-speed injection effect under low oil pressure.

[0052] The above is only the best implementation method adopted by this application in combination with current actual needs, but the protection scope of this application is not limited to this.

Claims

1. An integrated fuel injector with adjustable rate, comprising a main housing (1) and a nozzle (4), characterized in that: The spray head (4) is fixed to the bottom end of the main housing (1) through a locking sleeve (3); the top of the main housing (1) is detachably connected to a top cover (2); an oil supply bin (12) is provided in the main housing (1); a nozzle valve needle (5) is slidably connected to the spray head (4) along its axial direction; a spray nozzle (41) matching the nozzle valve needle (5) is provided at the bottom of the spray head (4); and an upper pressure bin (15) and a lower pressure bin (42) are provided at the top and bottom of the nozzle valve needle (5), respectively. The top of the upper pressure chamber (15) is slidably connected to an adjustment ring (52) along its axial direction, an adjustment capsule (53) is clamped between the upper part of the adjustment ring (52) and the top of the upper pressure chamber (15), and a first tensioning spring (51) is clamped between the nozzle valve needle (5) and the adjustment ring (52); An oil inlet pipeline (11) for supplying oil pressure to the oil supply bin (12) is provided on one side of the main housing (1); one side of the oil supply bin (12) is connected to the lower pressure bin (42) via a supply oil circuit (14); the output end of the supply oil circuit (14) is connected to the upper pressure bin (15) via a shunt pipe (141); the other side of the oil supply bin (12) is connected to the regulating capsule (53) via a regulating oil circuit (13); an actuator (7) is provided between the oil supply bin (12) and the upper pressure bin (15); the actuator (7) is used to block the shunt pipe (141).

2. The rate-adjustable integrated fuel injector according to claim 1, characterized in that: The actuator (7) comprises an electromagnetic ring (6) fixed between the oil supply bin (12) and the upper pressure bin (15), a matching permanent magnetic rod (71) being slidably connected inside the electromagnetic ring (6), the top end of the permanent magnetic rod (71) extending into the oil supply bin (12) and a second tensioning spring (72) being clamped between the oil supply bin (12), a connecting rod (73) being fixed at the bottom end of the permanent magnetic rod (71), and a blocking groove (17) corresponding to the bottom end of the connecting rod (73) being provided between the connection node between the shunt pipe (141) and the upper pressure bin (15).

3. The rate-adjustable integrated fuel injector according to claim 2, characterized in that: An upper valve core (732) and a lower valve core (731) symmetrically arranged in an upper and lower direction are fixed to the bottom end of the connecting rod (73), and a valve seat (16) matching the upper valve core (732) and the lower valve core (731) is provided in the main housing (1).

4. The integrated fuel injector with adjustable rate according to claim 3, characterized in that: The upper valve core (732) and the lower valve core (731) are of a conical valve core structure, and the conical tips of the upper valve core (732) and the lower valve core (731) are arranged opposite to each other. When the connecting rod (73) moves upward, the lower valve core (731) and its valve seat (16) are sealed together, and when the connecting rod (73) moves downward, the upper valve core (732) and its valve seat (16) are sealed together.

5. The integrated fuel injector with adjustable rate according to claim 2, characterized in that: The second tensioning spring (72) is a high-strength anti-fatigue spring structure, and has an elastic force that drives the connecting rod (73) to move upward away from the blocking groove (17). When the electromagnetic ring (6) is powered, it has a magnetic repulsive force that drives the permanent magnetic rod (71) to move downward and drives the bottom end of the connecting rod (73) to engage the blocking groove (17).

6. The integrated fuel injector with adjustable rate according to claim 1, characterized in that: The first tensioning spring (51) is a high-strength anti-fatigue spring structure, and the first tensioning spring (51) has an elastic force that drives the fuel injection nozzle valve needle (5) to move downward and seal the fuel injection nozzle (41).

7. The integrated fuel injector with adjustable rate according to claim 1, characterized in that: The expansion amount of the regulating sac (53) is directly proportional to the oil pressure of the oil inlet pipeline (11).

8. The integrated fuel injector with adjustable rate according to claim 2, characterized in that: A filter screen (22) is fixed to the bottom end of the top cover (2), and the output end of the oil inlet pipeline (11) extends into the filter screen (22) and provides oil pressure for the oil supply tank (12).

9. The integrated fuel injector with adjustable rate according to claim 8, characterized in that: Two groups of sealing rings (23) are provided on the top of the filter screen (22); the outer diameter of the sealing ring (23) is not less than the inner diameter of the oil supply bin (12); the two groups of sealing rings (23) form an annular closed space between the outer wall of the filter screen (22) and the inner wall of the oil supply bin (12); the filter screen (22) is provided with a connecting hole (24) on one side of the annular closed space; and the output end of the oil inlet pipeline (11) extends into the annular closed space.

10. The integrated fuel injector with adjustable rate according to claim 8, characterized in that: The permanent magnetic rod (71) extends to the top of the oil supply tank (12) and is fixed with a hydraulic sensor (74). The top cover (2) is provided with a wiring terminal (21). The hydraulic sensor (74) and the electromagnetic ring (6) are connected to the ECU via the wiring terminal (21).

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