Method and device for liquid superhigh pressure extrusion strengthening of high pressure common rail pipe fuel engine

Abstract

This invention belongs to the field of shipbuilding technology and discloses a high-pressure common rail fuel engine liquid ultra-high pressure extrusion strengthening device, including an equipment frame, shaft, end cover body, and ultra-high pressure pipeline body. An ultra-high pressure pipeline hydraulic system and fittings are fixedly installed inside the equipment frame, and an unloading valve is provided in the middle of the ultra-high pressure pipeline hydraulic system and fittings. This invention, through a combination of proprietary ultra-high pressure medium, seals, and an ultra-high pressure boosting device, pressurizes the ultra-high pressure medium to 1000 MPa. This ultra-high liquid pressure is transmitted to the inside of the high-pressure common rail pipeline. Under the action of ultra-high liquid pressure, controllable plastic deformation occurs on the inner surface of the pipeline, thereby improving the pipeline's pressure resistance. The normal pressure hydraulic system 8 is connected to a booster for the specialized ultra-high pressure medium to supply oil. To achieve the required pressure of 1000 MPa, a specialized ultra-high pressure medium is used for ultra-high pressure transmission, and a specialized seal ensures the pressure is established.

Description

Technical Field

[0001] This invention belongs to the field of shipbuilding industry technology, specifically a method and apparatus for strengthening liquid under ultra-high pressure extrusion in high-pressure common rail fuel engines. Background Technology

[0002] High-pressure common rail systems use a high-pressure fuel pump to deliver high-pressure fuel to a common fuel supply line. The fuel pressure in the common fuel supply line is precisely controlled, making the pressure in the high-pressure fuel line independent of the engine speed. This significantly reduces the degree to which the diesel engine's fuel supply pressure changes with engine speed. High-pressure common rail fuel engines are a major component of marine power systems.

[0004] High-pressure common rail pipelines withstand very high pressure at high temperatures. Commonly used high-strength steel pipelines need to be self-reinforced under ultra-high liquid pressure to meet these usage conditions. This is achieved by using an ultra-high liquid pressure device to provide ultra-high pressure. Under the action of ultra-high liquid pressure, the high-pressure common rail pipeline will undergo plastic deformation, thereby improving its pressure resistance and service life. Currently, there is a lack of methods and devices for self-reinforcement of high-pressure common rail pipelines under ultra-high liquid pressure, namely, ultra-high liquid pressure extrusion strengthening devices. Therefore, improvements are needed. Summary of the Invention

[0005] To address the problem mentioned in the background art of lacking a liquid ultra-high pressure self-reinforcing method and apparatus for high-pressure common rails, i.e., a liquid ultra-high pressure extrusion strengthening device, the present invention provides a liquid ultra-high pressure extrusion strengthening device for high-pressure common rail fuel engines.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a high-pressure common rail fuel engine liquid ultra-high pressure extrusion strengthening device, comprising an equipment frame, a shaft, an end cover body, and an ultra-high pressure pipeline body. An ultra-high pressure pipeline hydraulic system and fittings are fixedly installed within the equipment frame. An unloading valve is provided in the middle of the ultra-high pressure pipeline hydraulic system and fittings. An exhaust fan is fixedly installed on the top surface of the equipment frame. An ultra-high pressure booster is fixedly installed on one side of the unloading valve. An oil supply pipe clamping device is fixedly installed at the upper end of the equipment frame's inner cavity. A medium supply system is provided at the lower end of the equipment frame's inner cavity. A normal pressure hydraulic system is provided on one side of the medium supply system within the equipment frame's inner cavity. One end of the ultra-high pressure pipeline hydraulic system and fittings is fixedly connected to the oil supply pipe clamping device, and the other end of the ultra-high pressure pipeline hydraulic system and fittings is fixedly connected to the normal pressure hydraulic system. A washer is provided on the shaft. An unloading valve is provided on the outer side of the ultra-high pressure pipeline hydraulic system and fittings. The ultra-high pressure pipeline hydraulic system and fittings and the unloading valve are all movably connected to the shaft.

[0007] Preferably, a normal pressure cylinder body is movably connected to one side of the end cap body. A sealing element is provided at the end of the normal pressure cylinder body near the end cap body. A connecting piston rod is provided in the inner cavity of the normal pressure cylinder body. A connecting pressure cap is provided in the middle of the outer wall of the normal pressure cylinder body. A cylinder connecting block is provided in the inner cavity of the normal pressure cylinder body. A guide sleeve is provided in the middle of the connecting piston rod. A piston rod seal is provided in the middle of the connecting piston rod near the guide sleeve.

[0008] Preferably, the inner cavity of the connecting gland is provided with an outer cylinder of an ultra-high pressure cylinder, the inner cavity of the outer cylinder of the ultra-high pressure cylinder is provided with an inner cylinder of an ultra-high pressure cylinder, and the end of the outer cylinder of the ultra-high pressure cylinder away from the connecting gland is provided with a high-pressure cylinder end cap.

[0009] Preferably, the washer is made of copper alloy and is triangular, and the rubber ring is O-shaped.

[0010] Preferably, the atmospheric pressure cylinder body and the ultra-high pressure cylinder outer cylinder are connected by an oil supply pipe clamping device and fixed by a connecting gland.

[0011] Preferably, the end cap body has an oil inlet in the middle, the connecting gland and cylinder connecting block have an oil outlet in the middle, and the high-pressure cylinder end cap has a high-pressure oil outlet in the middle.

[0012] Preferably, the sealing element is fixedly connected to the ultra-high pressure pipe hydraulic system and pipe fittings, and the connecting piston rod is provided with a groove near the end cap body, which is adapted to the sealing element for installation.

[0013] Preferably, the ultra-high pressure pipeline body is configured with an olive pit structure, and the washer is adapted to the shaft.

[0014] The method for enhancing the liquid pressure of a high-pressure common rail fuel engine under ultra-high pressure extrusion is applied to the aforementioned high-pressure common rail fuel engine liquid ultra-high pressure extrusion strengthening device, and the specific steps are as follows:

[0015] S1. First, connect the atmospheric pressure hydraulic system to the booster of the special ultra-high pressure medium to supply oil. To achieve the required pressure of 1000 MPa, the special ultra-high pressure medium is used to transmit the ultra-high pressure. The ultra-high pressure pipeline is sealed by the olive-shaped structure at both ends of the ultra-high pressure pipeline body.

[0016] S2. Place the gasket and rubber ring on the outer wall of the inner cavity shaft of the ultra-high pressure booster in sequence to achieve ultra-high pressure sealing in combination. Under high pressure, the triangular gasket supports the O-ring rubber ring. When the pressure rises, the triangular gasket expands and blocks the gap. The O-ring rubber ring cannot be squeezed out, thus achieving the purpose of sealing.

[0017] The S3 shaft and washer together form an ultra-high pressure cylinder. An interference fit is used to generate pre-stress, which improves the pressure resistance of the ultra-high pressure cylinder. The cylinder body of the normal pressure cylinder and the outer cylinder of the ultra-high pressure cylinder are connected by a cylinder connecting block and fixed by a connecting cover. When the ultra-high liquid pressure is transmitted to the worktable, it is input into the high-pressure common rail pipeline, realizing the self-reinforcement of the high-pressure common rail pipeline.

[0018] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0019] This invention utilizes a combination of structures, including a guide sleeve to ensure directional movement of the connecting piston rod, a piston rod seal to isolate the medium in the low-pressure chamber from the ultra-high-pressure chamber, and a medium in the inner cylinder of the ultra-high-pressure cylinder whose pressure increases under the compression of the connecting piston rod, flowing from the high-pressure oil outlet to the actuator. The ultra-high-pressure cylinder consists of an inner cylinder and an outer cylinder, thereby improving its pressure resistance. The ultra-high-pressure booster adopts a single-acting cylinder structure to achieve rapid pressurization, and the outer cylinder of the booster adopts a multi-layer liner interference fit structure to improve the pressure resistance of the container. The ultra-high liquid pressure is transmitted to the inside of the high-pressure common rail pipeline, where controllable plastic deformation occurs on the inner surface of the pipeline under ultra-high liquid pressure, thereby improving the pipeline's pressure resistance.

[0020] This invention seals both ends of the ultra-high pressure pipeline by using a combination of gaskets and the ultra-high pressure pipeline body structure, and by designing the ultra-high pressure pipeline body with an olive-shaped structure. Under high pressure, the gaskets support the rubber rings. When the pressure rises, the gaskets expand, blocking the gaps and preventing the rubber rings from being squeezed out, thereby achieving the purpose of sealing.

[0021] This invention supplies oil by connecting the atmospheric pressure hydraulic system 8 to a booster for a special ultra-high pressure medium. To achieve the required pressure of 1000 MPa, a special ultra-high pressure medium is used to transmit the ultra-high pressure. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the self-reinforcing overall structure of the high-pressure common rail pipe of the present invention;

[0023] Figure 2 This is a schematic diagram of the sealing structure design for the ultra-high pressure pipeline of the present invention;

[0024] Figure 3 This is a schematic diagram of the copper alloy triangular washer and O-ring rubber structure of the present invention;

[0025] Figure 4 This is a schematic diagram of the single-acting ultra-high pressure booster of the present invention.

[0026] In the diagram: 1. Equipment frame; 2. Ultra-high pressure hydraulic system and fittings; 3. Unloading valve; 4. Exhaust fan; 5. Ultra-high pressure booster; 6. Oil supply pipe clamping device; 7. Medium supply system; 8. Atmospheric pressure hydraulic system; 9. Shaft; 10. Washer; 11. Rubber ring; 12. End cover body; 13. Atmospheric pressure cylinder body; 14. Seal; 15. Connecting piston rod; 16. Connecting gland; 17. Cylinder connecting block; 18. Guide sleeve; 19. Piston rod seal; 20. Ultra-high pressure cylinder inner cylinder; 21. Ultra-high pressure cylinder outer cylinder; 22. High pressure cylinder end cover; 23. Ultra-high pressure pipeline body. Detailed Implementation

[0027] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0028] like Figures 1 to 4 As shown, this invention provides a high-pressure common rail fuel engine liquid ultra-high pressure extrusion strengthening device, including an equipment frame 1, a shaft 9, an end cap body 12, and an ultra-high pressure pipeline body 23. An ultra-high pressure pipeline hydraulic system and fittings 2 are fixedly installed inside the equipment frame 1. An unloading valve 3 is provided in the middle of the ultra-high pressure pipeline hydraulic system and fittings 2. An exhaust fan 4 is fixedly installed on the top surface of the equipment frame 1. An ultra-high pressure booster 5 is fixedly installed on one side of the unloading valve 3. An oil supply pipe clamping device 6 is fixedly installed at the upper end of the equipment frame 1's inner cavity. A medium supply system 7 is provided at the lower end of the equipment frame 1's inner cavity. An atmospheric pressure hydraulic system 8 is provided on one side of the medium supply system 7 inside the equipment frame 1. One end of the ultra-high pressure pipeline hydraulic system and fittings 2 is fixedly connected to the oil supply pipe clamping device 6, and the other end of the ultra-high pressure pipeline hydraulic system and fittings 2 is fixedly connected to the atmospheric pressure hydraulic system 8. A washer 1 is provided on the shaft 9. 0. An unloading valve 3 is provided on the outside of the ultra-high pressure pipe hydraulic system and fitting 2. Both the ultra-high pressure pipe hydraulic system and fitting 2 and the unloading valve 3 are movably connected to the shaft 9. A normal pressure cylinder body 13 is movably connected to one side of the end cover body 12. A seal 14 is provided at the end of the normal pressure cylinder body 13 near the end cover body 12. A connecting piston rod 15 is provided in the inner cavity of the normal pressure cylinder body 13. A connecting pressure cap 16 is provided in the middle of the outer wall of the normal pressure cylinder body 13. A cylinder connecting block 17 is provided in the inner cavity of the normal pressure cylinder body 13. A guide sleeve 18 is provided in the middle of the connecting piston rod 15. A piston rod seal 19 is provided in the middle of the connecting piston rod 15 near the guide sleeve 18. An ultra-high pressure cylinder outer cylinder 21 is provided in the inner cavity of the connecting pressure cap 16. An ultra-high pressure cylinder inner cylinder 20 is provided in the inner cavity of the ultra-high pressure cylinder outer cylinder 21. A high pressure cylinder end cap 22 is provided at the end of the ultra-high pressure cylinder outer cylinder 21 away from the connecting pressure cap 16.

[0029] The above scheme is adopted: through the cooperation of the atmospheric pressure cylinder body 13 and the ultra-high pressure cylinder inner cylinder 20, the atmospheric pressure hydraulic system 8 is connected to the booster of the special ultra-high pressure medium for oil supply. To achieve the required pressure of 1000 MPa, a special ultra-high pressure medium is used for ultra-high pressure transmission. The ultra-high pressure pipeline body 23 is designed with an olive-shaped structure to seal both ends of the ultra-high pressure pipeline. Under high pressure, a gasket 10 supports the rubber ring 11. When the pressure rises, the gasket 10 expands, blocking the gap, and the rubber ring 11 cannot be squeezed out, thus achieving the purpose of sealing. After the ultra-high liquid pressure is transmitted to the worktable, it is input into the high-pressure common rail pipeline, enabling the pipeline to withstand and transmit the ultra-high liquid pressure, realizing the self-reinforcement of the high-pressure common rail pipeline. The left side of the atmospheric pressure cylinder body 13 is sealed by the end cap body 12, and oil enters through the left oil inlet, pushing the connecting piston rod 15 to move to the right. The guide sleeve 18 ensures the directional movement of the connecting piston rod 15, and the piston rod seal 19 isolates the low-pressure chamber. The medium in the ultra-high pressure chamber and the medium in the inner cylinder 20 of the ultra-high pressure cylinder are compressed by the connecting piston rod 15, and the pressure increases and flows from the high pressure oil outlet to the actuator. The ultra-high pressure cylinder is composed of the inner cylinder 20 and the outer cylinder 21 of the ultra-high pressure cylinder. The interference fit is used to generate pre-compression stress, thereby improving the pressure resistance of the ultra-high pressure cylinder. The right side of the ultra-high pressure cylinder is sealed by the high pressure cylinder end cover 22. The cylinder body 13 of the atmospheric pressure cylinder and the ultra-high pressure cylinder are connected by the cylinder connecting block 17 and fixed by the connecting cover 16. The ultra-high pressure booster 5 adopts a single-acting cylinder structure to achieve rapid pressure boosting. The outer cylinder of the booster adopts a multi-layer liner interference fit structure to improve the pressure resistance of the container. The ultra-high liquid pressure is transmitted to the inside of the high pressure common rail pipeline. Under the action of ultra-high liquid pressure, the inner surface of the pipeline produces controllable plastic deformation, thereby improving the pressure resistance of the pipeline.

[0030] like Figure 2 , Figure 3 As shown, the washer 10 is made of copper alloy and is triangular. The rubber ring 11 is O-shaped. The ultra-high pressure pipe body 23 is an olive pit structure. The washer 10 is adapted to the shaft 9. The seal 14 is fixedly connected to the ultra-high pressure pipe hydraulic system and the pipe fitting 2. The connecting piston rod 15 has a groove near the end cover body 12 and is adapted to the seal 14.

[0031] The above solution utilizes the design of gasket 10 and rubber ring 11. The material of gasket 10 is limited; copper alloy has higher strength and hardness than pure copper, offering superior wear resistance and deformation resistance. It also boasts excellent plasticity and ductility, making it highly formable in stamping and forging. It is less prone to cracking when machining triangular structures. Copper alloy is resistant to corrosion from most media, including atmosphere, fresh water, fuel oil, weak acids and alkalis, and seawater. Unlike carbon steel gaskets, it will not rust or become stuck, nor will it swell or age due to oils or solvents like rubber or plastic gaskets. It has a longer lifespan in humid and corrosive environments and will not contaminate the connected high-cleanliness components. As a non-ferromagnetic material, copper alloy will not be magnetized or attract metallic impurities, preventing thermal loosening and sealing failure. The triangle has three stable support points, preventing it from rotating or shifting freely during installation, unlike circular gaskets. The three edges of the triangle can hold the facet, and the copper alloy material has good machinability and mature heat treatment process, resulting in a long service life for the triangular metal gasket. It effectively prevents the gasket 10 from rotating with the fastener, avoiding the fastener from loosening and falling off. Through the design of the rubber ring 11, when the pressure rises, the triangular gasket expands, blocking the gap, and the O-ring rubber ring cannot be squeezed out, thus achieving the purpose of sealing. The design of the ultra-high pressure pipeline body 23 uses the conical surfaces at both ends of the olive pit to seal the ultra-high pressure pipeline. Through the design of the sealing element 14 with the ultra-high pressure pipeline hydraulic system and fitting 2, the sealing element 14 can be better sealed to prevent medium leakage, prevent external contaminants from entering, control friction and wear, ensure stable operation of the actuator, and the sealing of the sealing element 14 can significantly reduce the failure rate and maintenance frequency.

[0032] like Figure 3 , Figure 4 As shown, the atmospheric pressure cylinder body 13 and the ultra-high pressure cylinder outer cylinder 21 are connected by the oil supply pipe clamping device 6 and fixed by the connecting cover 16. The end cover body 12 is provided with an oil inlet in the middle, the connecting cover 16 and the cylinder connecting block 17 are provided with an oil outlet in the middle, and the high pressure cylinder end cover 22 is provided with a high pressure oil outlet in the middle.

[0033] The above scheme is adopted: through the cooperation of the atmospheric pressure cylinder body 13 and the ultra-high pressure cylinder outer cylinder 21, the atmospheric pressure cylinder body 13 and the ultra-high pressure cylinder outer cylinder 21 are connected by the cylinder connecting block 17 and fixed by the connecting cover 16, thereby improving the pressure resistance of the ultra-high pressure cylinder. The left side of the atmospheric pressure cylinder body 13 is sealed by the end cover body 12, and oil enters through the left oil inlet, pushing the connecting piston rod 15 to move to the right. The guide sleeve 18 ensures the directional movement of the connecting piston rod 15, and the piston rod seal 19 isolates the medium in the low pressure chamber from the medium in the ultra-high pressure chamber. The medium in the inner cylinder 20 of the ultra-high pressure cylinder is compressed by the connecting piston rod 15, and flows from the high-pressure oil outlet to the actuator. The ultra-high pressure cylinder is composed of the inner cylinder 20 and the outer cylinder 21 of the ultra-high pressure cylinder. The pre-compression stress is generated by the interference fit. The outer cylinder of the booster adopts a multi-layer liner interference fit structure to improve the pressure resistance of the container. The ultra-high liquid pressure is transmitted to the inside of the high-pressure common rail pipeline. Under the action of ultra-high liquid pressure, the inner surface of the pipeline undergoes controllable plastic deformation, which can improve the pressure resistance of the pipeline.

[0034] The method for enhancing the liquid pressure of a high-pressure common rail fuel engine by ultra-high pressure extrusion is applied to the high-pressure common rail fuel engine liquid ultra-high pressure extrusion enhancement device, and the specific steps are as follows:

[0035] S1. First, connect the atmospheric pressure hydraulic system 8 to the booster of the special ultra-high pressure medium to supply oil. To achieve the required pressure of 1000 MPa, the special ultra-high pressure medium is used to transmit the ultra-high pressure. The ultra-high pressure pipeline is sealed by the olive pit structure at both ends of the ultra-high pressure pipeline body 23.

[0036] S2. Place the gasket 10 and rubber ring 11 on the outer wall of the inner cavity shaft 9 of the ultra-high pressure booster 5 in sequence to achieve ultra-high pressure sealing in combination. Under high pressure, the triangular gasket supports the O-ring rubber ring. When the pressure rises, the triangular gasket expands and blocks the gap. The O-ring rubber ring cannot be squeezed out, thus achieving the purpose of sealing.

[0037] S3, shaft 9 and washer 10 form an ultra-high pressure cylinder. The pre-stress is generated by interference fit to improve the pressure resistance of the ultra-high pressure cylinder. The cylinder body 13 of the normal pressure cylinder and the outer cylinder 21 of the ultra-high pressure cylinder are connected by cylinder connecting block 17 and fixed by connecting cover 16. When the ultra-high liquid pressure is transmitted to the worktable, it is input into the high-pressure common rail pipeline to realize the self-reinforcement of the high-pressure common rail pipeline.

[0038] 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 process, method, article, or apparatus.

[0039] Although embodiments of the 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 invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A high-pressure common rail fuel engine liquid ultra-high pressure extrusion strengthening device, comprising an equipment frame (1), a shaft (9), an end cap body (12), and an ultra-high pressure pipeline body (23), characterized in that: The equipment frame (1) is fixedly installed with an ultra-high pressure pipe hydraulic system and fittings (2). An unloading valve (3) is provided in the middle of the ultra-high pressure pipe hydraulic system and fittings (2). An exhaust fan (4) is fixedly installed on the top surface of the equipment frame (1). An ultra-high pressure booster (5) is fixedly installed on one side of the unloading valve (3). An oil supply pipe clamping device (6) is fixedly installed at the upper end of the equipment frame (1). A medium supply system (7) is provided at the lower end of the equipment frame (1). An atmospheric pressure hydraulic system (8) is provided on one side of the medium supply system (7) in the equipment frame (1). One end of the ultra-high pressure pipe hydraulic system and fittings (2) is fixedly connected to the oil supply pipe clamping device (6). The other end of the ultra-high pressure pipe hydraulic system and fittings (2) is fixedly connected to the atmospheric pressure hydraulic system (8). The shaft (9) is provided with a washer (10), and a rubber ring (11) is provided on the outside of the washer (10). Both the washer (10) and the rubber ring (11) are movably connected to the shaft (9).

2. The high-pressure common rail fuel engine liquid ultra-high pressure extrusion strengthening device according to claim 1, characterized in that: One side of the end cap body (12) is movably connected to the atmospheric pressure cylinder body (13). The end of the atmospheric pressure cylinder body (13) near the end cap body (12) is provided with a sealing element (14). The inner cavity of the atmospheric pressure cylinder body (13) is provided with a connecting piston rod (15). The middle of the outer wall of the atmospheric pressure cylinder body (13) is provided with a connecting pressure cap (16). The inner cavity of the atmospheric pressure cylinder body (13) is provided with a cylinder connecting block (17). The middle of the connecting piston rod (15) is provided with a guide sleeve (18). The middle of the connecting piston rod (15) near the guide sleeve (18) is provided with a piston rod seal (19).

3. The high-pressure common rail fuel engine liquid ultra-high pressure extrusion strengthening device according to claim 2, characterized in that: The inner cavity of the connecting cover (16) is provided with an ultra-high pressure cylinder outer cylinder (21), the inner cavity of the ultra-high pressure cylinder outer cylinder (21) is provided with an ultra-high pressure cylinder inner cylinder (20), and the end of the ultra-high pressure cylinder outer cylinder (21) away from the connecting cover (16) is provided with a high pressure cylinder end cap (22).

4. The high-pressure common rail fuel engine liquid ultra-high pressure extrusion strengthening device according to claim 1, characterized in that: The washer (10) is made of copper alloy and is triangular, while the rubber ring (11) is O-shaped.

5. The high-pressure common rail fuel engine liquid ultra-high pressure extrusion strengthening device according to claim 3, characterized in that: The atmospheric pressure cylinder body (13) and the ultra-high pressure cylinder outer cylinder (21) are connected by an oil supply pipe clamping device (6) and fixed by a connecting cover (16).

6. The high-pressure common rail fuel engine liquid ultra-high pressure extrusion strengthening device according to claim 2, characterized in that: The end cap body (12) has an oil inlet in the middle, the connecting cap (16) and cylinder connecting block (17) have an oil outlet in the middle, and the high pressure cylinder end cap (22) has a high pressure oil outlet in the middle.

7. The high-pressure common rail fuel engine liquid ultra-high pressure extrusion strengthening device according to claim 2, characterized in that: The sealing element (14) is fixedly connected to the ultra-high pressure pipe hydraulic system and the fitting (2). The connecting piston rod (15) has a groove near the end cap body (12) and is adapted to the sealing element (14).

8. The high-pressure common rail fuel engine liquid ultra-high pressure extrusion strengthening device according to claim 1, characterized in that: The ultra-high pressure pipeline body (23) is configured with an olive pit structure, and the gasket (10) is adapted to the shaft (9).

9. A method for a high-pressure common rail fuel engine liquid ultra-high pressure extrusion strengthening device, applied to the high-pressure common rail fuel engine liquid ultra-high pressure extrusion strengthening device according to any one of claims 1-8, characterized in that, The specific steps are as follows: S1. First, connect the atmospheric pressure hydraulic system (8) to the booster of the special ultra-high pressure medium to supply oil. To achieve the required pressure of 1000 MPa, use the special ultra-high pressure medium to transmit the ultra-high pressure. Seal the ultra-high pressure pipeline through the olive pit structure at both ends of the ultra-high pressure pipeline body (23). S2. Place the gasket (10) and the O-ring rubber (11) on the outer wall of the inner shaft (9) of the ultra-high pressure booster (5) in sequence to perform ultra-high pressure sealing in combination. Under high pressure, the triangular gasket supports the O-ring rubber ring. When the pressure rises, the triangular gasket expands and blocks the gap. The O-ring rubber ring cannot be squeezed out, thus achieving the purpose of sealing. S3, shaft (9) and washer (10) form an ultra-high pressure cylinder. The pre-stress is generated by interference fit to improve the pressure resistance of the ultra-high pressure cylinder. The cylinder body (13) of the normal pressure cylinder and the outer cylinder (21) of the ultra-high pressure cylinder are connected by cylinder connecting block (17) and fixed by connecting cover (16). When the ultra-high liquid pressure is transmitted to the workbench, it is input into the high pressure common rail pipeline to realize the self-reinforcement of the high pressure common rail pipeline.

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