Marine internal combustion engine double-layer high-pressure oil pipe and preparation process thereof

Abstract

The invention relates to the technical field of internal combustion engines, in particular to a marine internal combustion engine double-layer high-pressure oil pipe which comprises a double-layer high-pressure oil pipe body composed of an inner-layer high-pressure oil pipe and an outer-layer sleeve. The fixing assembly comprises a clamping hoop arranged on the double-layer high-pressure oil pipe body in a sleeving mode and a C-shaped connecting block arranged outside the clamping hoop, a connecting rod is installed on the C-shaped connecting block, and a fixing plate is connected to the end, away from the C-shaped connecting block, of the connecting rod; the damping assembly is arranged in the [-shaped connecting block and comprises a third air bag; when the ship bow chain locker vibrates, the hoop drives the inner-layer high-pressure oil pipe to vibrate relative to the [-shaped connecting block, when the hoop moves, the hoop will extrude the inserting block up and down, the inserting block compresses the third air bag, gas in the third air bag is exhausted into the fourth air bag through the second exhaust pipeline, and the fourth air bag expands and pushes the damping rod to stretch out. And the damping rod rubs with the inner wall of the fourth storage groove, the displacement amplitude of the insertion block can be weakened through friction, and then the displacement amplitude generated by vibration is weakened.

Description

Technical Field

[0001] The present invention relates to the technical field of internal combustion engines, and particularly to a double-layer high-pressure fuel pipe for a marine internal combustion engine and a preparation process thereof. Background Art

[0002] An internal combustion engine is a power machine that burns fuel inside the machine and directly converts the released heat energy into power, which is a thermal engine; A marine internal combustion engine mainly uses diesel combustion to provide power, and the diesel high-pressure fuel pipe of the internal combustion engine is a key Class A part for providing high-pressure fuel transportation. In the prior art, a Chinese utility model with the publication number CN205895469U discloses a marine high-pressure fuel pipe. This marine high-pressure fuel pipe only includes a high-pressure fuel pipe body, a connecting component, and a pipe sleeve. In this technical solution, the fuel collection mechanism is integrated with one of the connecting mechanisms, which not only effectively solves the problem of the large volume of the overflow pipe but also combines the functions of the overflow pipe and the connecting mechanism. Thus, while providing the ability of oil spill feedback detection, most of the high-pressure fuel pipe body can always be unaffected by the overflow pipe. The fuel collection structure of the marine high-pressure fuel pipe is placed at one end of the pipe body and integrated with the connecting mechanism at the end of the pipe body. Not only is the volume of the overflow pipe body greatly reduced, but it can also be directly put into use during use and can be efficiently and conveniently connected to the installation position; The high-pressure fuel pipe is installed at the position of the bow anchor chain compartment through bolts. Since the bow anchor chain compartment often releases the anchor chain, it will cause large vibrations in the bow anchor chain compartment, and the vibrations can easily cause the bolts fixing the high-pressure fuel pipe to loosen, thus causing the high-pressure fuel pipe to loosen. Summary of the Invention

[0003] The purpose of the present invention is to provide a double-layer high-pressure fuel pipe for a marine internal combustion engine and a preparation process thereof to solve the problems raised in the above background art.

[0004] To achieve the above purpose, the present invention provides the following technical solutions: A double-layer high-pressure fuel pipe for a marine internal combustion engine and a preparation process thereof, including: A double-layer high-pressure fuel pipe body, which is composed of an inner high-pressure fuel pipe and an outer sleeve. The outer sleeve is arranged inside the inner high-pressure fuel pipe, and both ends of the outer sleeve are respectively connected with a first nut and a second nut; A fixing component for fixing the double-layer high-pressure fuel pipe body. The fixing component includes a clamp sleeved on the double-layer high-pressure fuel pipe body and a U-shaped connecting block arranged outside the clamp. A connecting rod is installed on the U-shaped connecting block, and one end of the connecting rod far from the U-shaped connecting block is connected with a fixing plate, and the fixing plate is installed on the inner wall of the bow anchor chain compartment; The shock-absorbing assembly is arranged at a position corresponding to the clamp inside the U-shaped connecting block, and the shock-absorbing assembly includes a third airbag.

[0005] Preferably, an inner nut is sleeved on the outer surface of the end of the outer sleeve at a position corresponding to the inside of the first nut, and a first O-ring is arranged between the inner nut and the outer surface of the outer sleeve; A first bushing is sleeved on the outer surface of the end of the inner high-pressure oil pipe at a position corresponding to the inside of the first nut. The first bushing is located at one end of the inner nut, and a second O-ring is arranged between the outer surface of the first bushing and the inner wall of the first nut; A second bushing is sleeved on the outer surface of the end of the inner high-pressure oil pipe at a position corresponding to the inside of the first nut. The second bushing is located on the side of the first bushing away from the inner nut.

[0006] Preferably, a harp-shaped joint is sleeved on the outer surface of one end of the second nut connected to the outer sleeve. The harp-shaped joint is communicated with the second nut, and a third O-ring is arranged between the inside of the harp-shaped joint and the outer surface of the second nut; A circlip is installed on the outer surface of one end of the second nut at a position corresponding to the harp-shaped joint, and a gasket is arranged between the circlip and the harp-shaped joint.

[0007] Preferably, two sets of clamps are provided, and a fixing bolt is screwed at the connection of the two sets of clamps; A plurality of second receiving grooves are provided at intervals on the inner walls of the two sets of clamps. A clamping rod is inserted into each of the second receiving grooves, and a first return spring is arranged between the end of each clamping rod and the inner wall of the corresponding second receiving groove. The clamping rod is elastically in contact with the outer wall of the double-layer high-pressure oil pipe body through the first return spring; A guide block is arranged on the side wall of each clamping rod, and a guide groove is opened on the inner side wall of each second receiving groove at a position corresponding to the corresponding guide block. The guide block is slidably arranged inside the guide groove.

[0008] Preferably, a plurality of fixing grooves are provided at intervals on the other side wall of each clamping rod. A third receiving groove is opened on the inner side wall of the second receiving groove at a position corresponding to one set of the fixing grooves, and a fixing block is arranged inside the third receiving groove; A second return spring is arranged between the end of the fixing block and the inner wall of the third receiving groove. The fixing block is elastically arranged inside the third receiving groove through the second return spring; A control assembly is arranged inside the clamp for controlling the expansion and contraction of the fixing block.

[0009] Preferably, the control component includes a first storage groove formed in the side walls of two sets of clamps close to each other. An extrusion block is arranged inside the first storage groove, and a first airbag is arranged between the side wall of the extrusion block and the inner side wall of the first storage groove; A fourth exhaust duct is formed inside the clamp, and one end of the fourth exhaust duct communicates with the first airbag; A second airbag is arranged between the side wall of each fixing block and the side wall of the corresponding third storage groove, and a first exhaust duct is formed between each second airbag and the corresponding fourth exhaust duct.

[0010] Preferably, fourth storage grooves are formed in the upper and lower side walls inside the U-shaped connecting block, and the third airbag is arranged inside the fourth storage groove; An insertion block is installed on the side wall of the third airbag away from the fourth storage groove, and an inclined surface is formed at one end of the insertion block facing the open end of the U-shaped connecting block.

[0011] Preferably, a fifth storage groove is formed at the position of the inner side wall of the fourth storage groove corresponding to the end of the insertion block, and a damping rod is arranged inside the fifth storage groove; A fourth airbag is arranged between the end of the damping rod and the inner wall of the corresponding fifth storage groove, and a second exhaust duct is formed between the fourth airbag and the third airbag.

[0012] Preferably, an air storage cavity is formed inside the U-shaped connecting block corresponding to the position of the third airbag. A sealing plate is slidably arranged inside the air storage cavity, and a third return spring is arranged between the end of the sealing plate and the inner wall of the air storage cavity; A third exhaust duct is formed between the air storage cavity and the third airbag; A slot is formed at the connection of the two sets of clamps, and the size of the slot is adapted to the size of the insertion block.

[0013] Preferably, the preparation process includes: 1. Blanking: Cut the stock according to the developed length dimensions of the inner layer pipe and the outer sleeve pipe in the oil pipe; 2. Anti-rust treatment of the surface of the pipe fittings according to customer requirements; 3. Pipe end processing: Chamfering and deburring of both ends of the pipe fittings; 4. Upsetting - end A: Clamp the pipe fittings processed at both ends on the pipe end forming machine respectively and upset and form the end A; 5. Assembly component - 1: After the end A is processed and formed, put on the outer sleeve pipe, the nut at end A and the bushing at end B respectively; 6. Upsetting - end B: Clamp the sleeved pipe fittings on the pipe end forming machine again and upset and form the end B; 7. The pipe fittings with well-formed ends at both ends are bent and processed into shape on a CNC pipe bender according to the coordinate dimensions. 8. Assembly component - 2: Put a combined nut, a split bushing, and an O-ring on the B end of the bent pipe fitting. 9. Laser marking: Laser marking is carried out on the end face of the connecting nut, including information such as part number + batch number + supplier code, etc. 10. Pressure test inspection: Each pipe fitting is subjected to a diesel pressure test with an oil pressure of 4200 Bar and a pressure holding time of 5S according to the requirements of the pressure test outline. 11. High-pressure cleaning: The inner and outer surfaces of the assembled pipe fittings are cleaned with a water-based cleaning liquid under high pressure, and the maximum particle size is <200μm. 12. Drying: The cleaned pipe fittings are placed in an oven at a set temperature of 100°C for 30 minutes to remove the residual liquid adhering to the inside and outside of the pipe fittings. 13. Rust prevention: After the dried pipe fittings are cooled, oil injection rust prevention treatment is carried out on the inner holes of the pipe fittings. 14. Plug cap protection: Dust-proof plug caps are installed at both ends of the pipe fittings after cleaning and rust prevention to prevent secondary pollution. 15. Assembly packaging: The pipe fittings with plug caps installed are packed into boxes according to the packaging specification requirements, and each box ≤ 25KG.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows: In the present invention, through the cooperation of the clamp and the U-shaped connection block, the inner high-pressure oil pipe is connected to the fixing plate, and then the inner high-pressure oil pipe is installed into the bow anchor chain cabin through the fixing plate. When the bow anchor chain cabin vibrates, the clamp drives the inner high-pressure oil pipe to vibrate relative to the U-shaped connection block. When the clamp displaces, it will squeeze the insertion block up and down. The insertion block compresses the third airbag, and the gas inside the third airbag is discharged into the fourth airbag through the second exhaust pipe. The fourth airbag expands and pushes the damping rod to extend. At this time, when the insertion block drives the extended damping rod to move, the damping rod rubs against the inner wall of the fourth receiving groove, and the friction will weaken the displacement amplitude of the insertion block, thereby weakening the displacement amplitude generated by the vibration. When two groups of clamps are installed on the outer surface of the double-layer high-pressure oil pipe body through fixing bolts, the clamping rod is in elastic contact with the outer surface of the double-layer high-pressure oil pipe body through the first return spring. At this time, the two groups of extrusion blocks squeeze each other, and the gas inside the first airbag is discharged into the second airbag through the cooperation of the fourth exhaust pipe and the first exhaust pipe. The second airbag expands and pushes the fixing block to be inserted into one of the fixing grooves, limiting the elastically arranged clamping rod, and thus fixedly connecting the two groups of clamps to the double-layer high-pressure oil pipe body. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the structural connection between the double-layer high-pressure oil pipe body and the fixing plate of the present invention; Figure 2Schematic diagram of the connection structure between the double-layer high-pressure oil pipe body and the C-shaped connection block of the present invention; Figure 3 Schematic cross-sectional view of the clamp structure of the present invention; Figure 4 For Figure 3 Enlarged schematic diagram of the structure at position C in Figure 5 For Figure 3 Enlarged schematic diagram of the structure at position D in Figure 6 For Figure 5 Enlarged schematic diagram of the structure at position E in Figure 7 Schematic diagram of the connection structure of two groups of clamp structures of the present invention; Figure 8 Schematic cross-sectional view of the C-shaped connection block structure of the present invention; Figure 9 For Figure 8 Enlarged schematic diagram of the structure at position F in Figure 10 Schematic diagram of the double-layer high-pressure oil pipe body structure of the present invention; Figure 11 Vertical cross-sectional view of the double-layer high-pressure oil pipe body of the present invention; Figure 12 For Figure 11 Enlarged schematic diagram of the structure at position A in Figure 13 Horizontal cross-sectional view of the double-layer high-pressure oil pipe body of the present invention; Figure 14 For Figure 13 Enlarged schematic diagram of the structure at position B in Figure 15 Process flow chart for the preparation of the double-layer high-pressure oil pipe body of the present invention.

[0016] In the figure: 1. Inner high-pressure oil pipe; 2. Outer sleeve; 3. First nut; 4. First bushing; 5. First O-ring; 6. Inner nut; 7. Second O-ring; 8. Second bushing; 9. Second nut; 10. Flute joint; 11. Third O-ring; 12. Gasket; 13. Snap ring; 14. Double-layer high-pressure oil pipe body; 15. Fixed plate; 16. Connecting rod; 17. Clamp; 18. Fixed bolt; 19. C-shaped connecting block; 20. Clamping rod; 21. First receiving groove; 22. First airbag; 23. Extrusion block; 24. Second receiving groove; 25. First return spring; 26. Guide groove; 27. Guide block; 28. First exhaust pipe; 29. Fixed groove; 30. Third receiving groove; 31. Fixed block; 32. Second airbag; 33. Second return spring; 34. Fourth receiving groove; 35. Third airbag; 36. Insert block; 37. Bevel surface; 38. Fifth receiving groove; 39. Damping rod; 40. Fourth airbag; 41. Second exhaust pipe; 42. Third exhaust pipe; 43. Air storage cavity; 44. Sealing plate; 45. Third return spring; 46. Slot; 47. Fourth exhaust pipe. Detailed implementation mode

[0017] It should be noted that, without conflict, the embodiments in this application and the features in the embodiments can be combined with each other. The following will detail this application with reference to the drawings and in combination with the embodiments.

[0018] To enable those skilled in the art to better understand the solution of this application, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are only a part of the embodiments of this application, rather than all the embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of this application.

[0019] As Figures 10 - 14 shown, this application provides a double-layer high-pressure oil pipe for marine internal combustion engines, including: a double-layer high-pressure oil pipe body 14, which is composed of an inner high-pressure oil pipe 1 and an outer sleeve 2. The outer sleeve 2 is arranged inside the inner high-pressure oil pipe 1, and both ends of the outer sleeve 2 are respectively connected with a first nut 3 and a second nut 9; An inner nut 6 is sleeved on the outer surface of the end of the outer sleeve 2 corresponding to the inside of the first nut 3, and a first O-ring 5 is arranged between the outer surfaces of the inner nut 6 and the outer sleeve 2; The sealing between the outer sleeve 2 and the inner nut 6 is achieved through the first O-ring 5; A first bushing 4 is sleeved on the outer surface of the end of the inner high-pressure oil pipe 1 at a position corresponding to the inside of the first nut 3. The first bushing 4 is located at one end of the inner nut 6, and a second O-ring 7 is arranged between the outer surface of the first bushing 4 and the inner wall of the first nut 3; The sealing between the first bushing 4 and the first nut 3 is achieved through the second O-ring 7; A second bushing 8 is sleeved on the outer surface of the end of the inner high-pressure oil pipe 1 at a position corresponding to the inside of the first nut 3. The second bushing 8 is located on the side of the first bushing 4 away from the inner nut 6; In this embodiment: through the cooperation of the first bushing 4, the inner nut 6 and the second bushing 8, the first nut 3 is limited to prevent the first nut 3 from detaching from the outer sleeve 2.

[0020] Specifically, as Figures 10 - 14 shown, a harp-shaped joint 10 is sleeved on the outer surface of one end of the second nut 9 connected to the outer sleeve 2. The harp-shaped joint 10 communicates with the second nut 9, and a third O-ring 11 is arranged between the inside of the harp-shaped joint 10 and the outer surface of the second nut 9; A snap ring 13 is installed on the outer surface of one end of the second nut 9 at a position corresponding to the harp-shaped joint 10, and a gasket 12 is arranged between the snap ring 13 and the harp-shaped joint 10; In this embodiment: the harp-shaped joint 10 communicates with the inner high-pressure oil pipe 1 through the second nut 9, and a snap ring 13 is arranged on one side of the harp-shaped joint 10. The harp-shaped joint 10 is limited and fixed through the snap ring 13, and the gasket 12 is arranged to elastically limit the harp-shaped joint 10.

[0021] Specifically, as Figures 1 - 3 shown, a marine internal combustion engine double-layer high-pressure oil pipe includes a fixing component for fixing the double-layer high-pressure oil pipe body 14. The fixing component includes a clamp 17 sleeved on the double-layer high-pressure oil pipe body 14; There are two groups of clamps 17, and a fixing bolt 18 is screwed at the connection of the two groups of clamps 17; In this embodiment: the two groups of clamps 17 are installed on the outside of the double-layer high-pressure oil pipe body 14 through the fixing bolt 18.

[0022] Specifically, as Figures 1 - 3 shown, multiple groups of second receiving grooves 24 are formed at intervals on the inner walls of the two groups of clamps 17. A clamping rod 20 is inserted into each second receiving groove 24, and a first return spring 25 is arranged between the end of each clamping rod 20 and the inner wall of the corresponding second receiving groove 24. The clamping rod 20 is elastically in contact with the outer wall of the double-layer high-pressure oil pipe body 14 through the first return spring 25; A guiding block 27 is provided on the side wall of each clamping rod 20, and a guiding groove 26 is formed on the inner side wall of each second receiving groove 24 at a position corresponding to the corresponding guiding block 27, and the guiding block 27 is slidably arranged inside the guiding groove 26; In this embodiment: when the two sets of clamps 17 are installed outside the double-layer high-pressure oil pipe body 14, each clamping rod 20 is elastically contacted with the outer surface of the double-layer high-pressure oil pipe body 14 under the action of the corresponding first return spring 25, and thus can be sleeved outside the double-layer high-pressure oil pipe body 14 with various diameters.

[0023] Specifically, as Figures 4 - 6 shown, a plurality of groups of fixed grooves 29 distributed at intervals are formed on the other side wall of each clamping rod 20, a third receiving groove 30 is formed on the inner side wall of the second receiving groove 24 at a position corresponding to one group of the fixed grooves 29, and a fixing block 31 is arranged inside the third receiving groove 30; A second return spring 33 is arranged between the end of the fixing block 31 and the inner wall of the third receiving groove 30, and the fixing block 31 is elastically arranged inside the third receiving groove 30 through the second return spring 33; A control assembly is arranged inside the clamp 17 for controlling the expansion and contraction of the fixing block 31; The control assembly includes a first receiving groove 21 formed on the side wall of the two sets of clamps 17 close to each other, an extrusion block 23 is arranged inside the first receiving groove 21, and a first airbag 22 is arranged between the side wall of the extrusion block 23 and the inner side wall of the first receiving groove 21; A fourth exhaust duct 47 is formed inside the clamp 17, and one end of the fourth exhaust duct 47 is communicated with the first airbag 22; A second airbag 32 is arranged between the side wall of each fixing block 31 and the side wall of the corresponding third receiving groove 30, and a first exhaust duct 28 is formed between each second airbag 32 and the corresponding fourth exhaust duct 47; In this embodiment: when the two sets of clamps 17 are installed on the outer surface of the double-layer high-pressure oil pipe body 14 through the fixing bolts 18, the two extrusion blocks 23 are mutually extruded, and the gas inside the first airbag 22 is discharged into the inside of the second airbag 32 through the cooperation of the fourth exhaust duct 47 and the first exhaust duct 28. The second airbag 32 expands and pushes the fixing block 31 to be inserted into one group of the fixed grooves 29 inside, so as to limit the elastically arranged clamping rod 20, and further fixedly connect the two sets of clamps 17 with the double-layer high-pressure oil pipe body 14.

[0024] Specifically, as Figures 7 - 9 shown, fourth receiving grooves 34 are formed on the upper and lower side walls inside the U-shaped connecting block 19, and a third airbag 35 is arranged inside the fourth receiving grooves 34; On one side wall of the third airbag 35 away from the fourth receiving groove 34, an insertion block 36 is installed, and an inclined surface 37 is provided at one end of the insertion block 36 facing the open end of the U-shaped connection block 19; The provision of the inclined surface 37 facilitates the snap connection of the clamp 17 into the interior of the U-shaped connection block 19; At a position corresponding to the inner side wall of the fourth receiving groove 34 at the end of the insertion block 36, a fifth receiving groove 38 is provided, and a damping rod 39 is arranged inside the fifth receiving groove 38; A fourth airbag 40 is arranged between the end of the damping rod 39 and the inner wall of the corresponding fifth receiving groove 38, and a second exhaust duct 41 is provided between the fourth airbag 40 and the third airbag 35.

[0025] At a position corresponding to the third airbag 35 inside the U-shaped connection block 19, an air storage cavity 43 is provided, a sealing plate 44 is slidably arranged inside the air storage cavity 43, and a third return spring 45 is arranged between the end of the sealing plate 44 and the inner wall of the air storage cavity 43; A third exhaust duct 42 is provided between the air storage cavity 43 and the third airbag 35; When the clamp 17 is snap-connected, the clamp 17 will squeeze the insertion block 36. At this time, the gas inside the third airbag 35 can be discharged into the air storage cavity 43 through the third exhaust duct 42; The provision of the third return spring 45 enables the air inside the third airbag 35 to be preferentially discharged into the fourth airbag 40; A slot 46 is provided at the connection of the two clamps 17, and the size of the slot 46 is adapted to the size of the insertion block 36; In this embodiment: Through the cooperation of the clamp 17 and the U-shaped connection block 19, the inner high-pressure oil pipe 1 is connected to the fixing plate 15, and then the inner high-pressure oil pipe 1 is installed into the bow anchor chain compartment through the fixing plate 15. When the bow anchor chain compartment vibrates, the clamp 17 drives the inner high-pressure oil pipe 1 to vibrate relative to the U-shaped connection block 19. When the clamp 17 is displaced, it will squeeze the insertion block 36 up and down. The insertion block 36 compresses the third airbag 35, and the gas inside the third airbag 35 is discharged into the fourth airbag 40 through the second exhaust duct 41. The fourth airbag 40 expands and pushes the damping rod 39 to extend. At this time, when the insertion block 36 drives the extended damping rod 39 to move, the damping rod 39 rubs against the inner wall of the fourth receiving groove 34, and the friction weakens the displacement amplitude of the insertion block 36, thereby weakening the displacement amplitude generated by the vibration.

[0026] Specifically, as Figure 15 shown, the preparation process of the double-layer high-pressure oil pipe body 14 includes: Inner high-pressure oil pipe 1, blanking: Cut and prepare materials according to the developed length dimensions of the inner pipe and the outer sleeve in the oil pipe; Outer sleeve 2, rust prevention treatment is carried out on the surface of the pipe fitting according to customer requirements; First nut 3, pipe end machining: Chamfering and deburring the two ends of the pipe fitting; First bushing 4, upsetting - end A: Clamp the pipe fittings with both ends machined on the pipe end forming machine respectively, and upset and form the end A; First O - ring 5, assembling component - 1: After the end A is machined and formed, put on the outer pipe, the nut at end A and the bushing at end B respectively; Inner nut 6, upsetting - end B: Clamp the assembled pipe fittings on the pipe end forming machine again, and upset and form the end B; Second O - ring 7, The pipe fittings with both ends formed are bent and processed on the CNC pipe bender according to the coordinate dimensions; Second bushing 8, assembling component - 2: Put on the combined nut, split bushing and O - ring on the B - end of the bent pipe fittings; Second nut 9, laser marking: Adopt laser marking on the end face of the connecting nut, including information such as part number + batch number + supplier code, etc.; Arched joint 10, pressure test detection: Conduct a diesel pressure - bearing test with an oil pressure of 4200 Bar and a pressure - holding time of 5S for each pipe fitting according to the requirements of the pressure test outline; Third O - ring 11, high - pressure cleaning: High - pressure clean the inner and outer surfaces of the assembled pipe fittings with a water - based cleaning liquid, and the maximum particle size < 200μm; Gasket 12, drying: Place the cleaned pipe fittings in an oven at a set temperature of 100°C for 30 minutes to remove the residual liquid attached to the inside and outside of the pipe fittings; Circlip 13, rust prevention: After the dried pipe fittings are cooled, inject oil into the inner hole of the pipe fittings for rust prevention treatment; Double - layer high - pressure oil pipe body 14, plug protection: Install dust - proof plugs at both ends of the pipe fittings after cleaning and rust prevention to prevent secondary pollution; Fixed plate 15, assembling and packaging: Pack the pipe fittings with plugs installed into boxes according to the packaging specification requirements, and each box ≤ 25KG.

[0027] Specifically, this solution is as follows: Install two sets of clamps 17 to the outer surface of the double - layer high - pressure oil pipe body 14 through fixing bolts 18. At this time, the clamping rod 20 is elastically in contact with the outer surface of the double - layer high - pressure oil pipe body 14 through the first return spring 25. At the same time, the two sets of extrusion blocks 23 squeeze each other, and the gas inside the first airbag 22 is discharged into the second airbag 32 through the cooperation of the fourth exhaust pipe 47 and the first exhaust pipe 28. The second airbag 32 expands and pushes the fixing block 31 to be inserted into one of the fixing grooves 29 to limit the elastically arranged clamping rod 20, thereby fixedly connecting the two sets of clamps 17 with the double - layer high - pressure oil pipe body 14; Then, the U-shaped connecting block 19 is clamped at the connection of the two sets of clamps 17. At this time, the insertion block 36 is clamped inside the slot 46. The U-shaped connecting block 19 is connected to the two sets of clamps 17 through the cooperation of the insertion block 36 and the slot 46. Then, the other end of the connecting rod 16 connected to the U-shaped connecting block 19 is connected to the lower end surface of the fixing plate 15, and then the fixing plate 15 is fixed to the inner wall of the bow anchor chain compartment.

[0028] Those of ordinary skill in the art should understand that the discussion of any embodiment above is merely exemplary; under the idea of the present invention, the technical features in the above embodiments or different embodiments can also be combined, and the steps can be implemented in any order, and there are many other variations in different aspects of the present invention as described above. For the sake of brevity, they are not provided in detail.

[0029] The present invention aims to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A double-layer high-pressure fuel pipe for marine internal combustion engines, characterized in that, Comprising: A double-layer high-pressure oil pipe body (14), the double-layer high-pressure oil pipe body (14) is composed of an inner-layer high-pressure oil pipe (1) and an outer sleeve (2), the outer sleeve (2) is arranged inside the inner-layer high-pressure oil pipe (1), and both ends of the outer sleeve (2) are respectively connected with a first nut (3) and a second nut (9); A fixing component for fixing the double-layer high-pressure oil pipe body (14), the fixing component includes a clamp (17) sleeved on the double-layer high-pressure oil pipe body (14) and a U-shaped connecting block (19) arranged outside the clamp (17), and a connecting rod (16) is installed on the U-shaped connecting block (19), one end of the connecting rod (16) far from the U-shaped connecting block (19) is connected with a fixing plate (15), and the fixing plate (15) is installed on the inner wall of the bow anchor chain compartment; A shock-absorbing component is arranged at a position corresponding to the clamp (17) inside the U-shaped connecting block (19), and the shock-absorbing component includes a third airbag (35).

2. The double-layer high-pressure oil pipe for marine internal combustion engine according to claim 1, wherein An inner nut (6) is sleeved on the outer surface of the end of the outer sleeve (2) corresponding to the inside of the first nut (3), and a first O-ring (5) is arranged between the inner nut (6) and the outer surface of the outer sleeve (2); A first bushing (4) is sleeved on the outer surface of the end of the inner-layer high-pressure oil pipe (1) corresponding to the inside of the first nut (3), the first bushing (4) is located at one end of the inner nut (6), and a second O-ring (7) is arranged between the outer surface of the first bushing (4) and the inner wall of the first nut (3); A second bushing (8) is sleeved on the outer surface of the end of the inner-layer high-pressure oil pipe (1) corresponding to the inside of the first nut (3), and the second bushing (8) is located on the side of the first bushing (4) far from the inner nut (6).

3. A double-layer high-pressure fuel pipe for a marine internal combustion engine according to claim 1, characterized in that, A harp-shaped joint (10) is sleeved on the outer surface of one end of the second nut (9) connected to the outer sleeve (2), the harp-shaped joint (10) communicates with the second nut (9), and a third O-ring (11) is arranged between the inside of the harp-shaped joint (10) and the outer surface of the second nut (9); A circlip (13) is installed on the outer surface of one end of the second nut (9) corresponding to the harp-shaped joint (10), and a gasket (12) is arranged between the circlip (13) and the harp-shaped joint (10).

4. A double-layer high-pressure fuel pipe for a marine internal combustion engine according to claim 1, characterized in that, There are two groups of the clamps (17), and a fixing bolt (18) is screwed at the connection of the two groups of the clamps (17); A plurality of groups of second receiving grooves (24) distributed at intervals are formed on the inner walls of the two groups of the clamps (17), a clamping rod (20) is inserted into each of the second receiving grooves (24), and a first return spring (25) is arranged between the end of each clamping rod (20) and the inner wall of the corresponding second receiving groove (24), and the clamping rod (20) is elastically in contact with the outer wall of the double-layer high-pressure oil pipe body (14) through the first return spring (25); The side walls of each of the clamping rods (20) are provided with guide blocks (27). Corresponding to the position of each of the guide blocks (27), guide grooves (26) are formed in the inner side walls of the second storage grooves (24), and the guide blocks (27) are slidably arranged inside the guide grooves (26).

5. A double-layer high-pressure fuel pipe for a marine internal combustion engine according to claim 4, characterized in that, On the other side walls of each of the clamping rods (20), a plurality of groups of fixed grooves (29) are spaced apart and formed. Corresponding to the position of one of the groups of fixed grooves (29), a third storage groove (30) is formed in the inner side wall of the second storage groove (24), and a fixing block (31) is arranged inside the third storage groove (30); A second return spring (33) is arranged between the end of the fixing block (31) and the inner wall of the third storage groove (30), and the fixing block (31) is elastically arranged inside the third storage groove (30) through the second return spring (33); A control component is arranged inside the clamp (17) for controlling the expansion and contraction of the fixing block (31).

6. The double-layer high-pressure fuel pipe for a marine internal combustion engine according to claim 5, characterized in that, The control component includes a first storage groove (21) formed in the side walls of the two clamps (17) close to each other. An extrusion block (23) is arranged inside the first storage groove (21), and a first airbag (22) is arranged between the side wall of the extrusion block (23) and the inner side wall of the first storage groove (21); A fourth exhaust duct (47) is formed inside the clamp (17), and one end of the fourth exhaust duct (47) is communicated with the first airbag (22); Second airbags (32) are arranged between the side walls of each of the fixing blocks (31) and the side walls of the corresponding third storage grooves (30), and first exhaust ducts (28) are formed between each of the second airbags (32) and the corresponding fourth exhaust duct (47).

7. A double-layer high-pressure oil pipe for a marine internal combustion engine according to claim 1, characterized in that, Fourth storage grooves (34) are formed in the upper and lower side walls inside the U-shaped connecting block (19), and the third airbag (35) is arranged inside the fourth storage grooves (34); On the side wall of the third airbag (35) away from the fourth storage groove (34), an insertion block (36) is installed, and an inclined surface (37) is formed at one end of the insertion block (36) facing the open end of the U-shaped connecting block (19).

8. A double-layer high-pressure fuel pipe for a marine internal combustion engine according to claim 7, characterized in that, A fifth storage groove (38) is formed at the end of the insertion block (36) corresponding to the position of the inner side wall of the fourth storage groove (34), and a damping rod (39) is arranged inside the fifth storage groove (38); A fourth airbag (40) is arranged between the end of the damping rod (39) and the inner wall of the corresponding fifth storage groove (38), and a second exhaust duct (41) is formed between the fourth airbag (40) and the third airbag (35).

9. The double-layer high-pressure fuel pipe for marine internal combustion engine according to claim 8, characterized in that, A gas storage cavity (43) is formed inside the U-shaped connecting block (19) corresponding to the position of the third airbag (35). A sealing plate (44) is slidably arranged inside the gas storage cavity (43), and a third return spring (45) is arranged between the end of the sealing plate (44) and the inner wall of the gas storage cavity (43); A third exhaust pipe (42) is provided between the gas storage cavity (43) and the third airbag (35); A slot (46) is provided at the connection of the two sets of clamps (17), and the size of the slot (46) is adapted to the size of the insertion block (36).

10. A preparation process for a double-layer high-pressure fuel pipe for a marine internal combustion engine, characterized in that, Including the marine internal combustion engine double-layer high-pressure oil pipe according to any one of claims 1-3, the manufacturing process includes: (1) Blanking: Cut and prepare materials according to the unfolded length dimensions of the inner pipe and the outer sleeve in the oil pipe; (2) Antirust treatment of the pipe fittings surface according to customer requirements; (3) Pipe end processing: Chamfer and deburr the two ends of the pipe fittings; (4) Upsetting - end A: Clamp the pipe fittings processed at both ends on the pipe end forming machine respectively and upset and form the end A; (5) Assembling component - 1: After the end A is processed and formed, put on the outer pipe, the nut at end A and the bushing at end B respectively; (6) Upsetting - end B: Clamp the assembled pipe fittings on the pipe end forming machine again and upset and form the end B; (7) The pipe fittings with both ends formed are bent and processed on a CNC pipe bender according to the coordinate dimensions; (8) Assembling component - 2: Put on a combined nut, a split bushing and an O-ring at end B on the bent pipe fittings; (9) Laser marking: Adopt laser marking on the end face of the connection nut, including information such as part number + batch number + supplier code, etc.; (10) Pressure test and inspection: Conduct a diesel pressure test with an oil pressure of 4200 Bar and a pressure holding time of 5S for each pipe fitting according to the requirements of the pressure test outline; (11) High-pressure cleaning: High-pressure clean the inner and outer surfaces of the assembled pipe fittings with a water-based cleaning liquid, and the maximum particle size < 200μm; (12) Drying: Place the cleaned pipe fittings in an oven at a set temperature of 100°C for 30 minutes to remove the residual liquid attached to the inside and outside of the pipe fittings; (13) Antirust: After the dried pipe fittings are cooled, inject oil into the inner hole of the pipe fittings for antirust treatment; (14) Plug cap protection: Install dust-proof plug caps at both ends of the pipe fittings after cleaning and antirusting to prevent secondary pollution; (15) Assembly packaging: Pack the pipe fittings with plug caps installed into boxes according to the packaging specification requirements, and each box ≤ 25KG.

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