External cylinder cover air inlet passage methanol injection switching system

Abstract

The utility model relates to an external cylinder cover air inlet channel methanol injection switching system, and relates to the field of ship engineering and power systems. The methanol spraying device comprises a cylinder cover, a front-end switching block arranged at one end of the top of the cylinder cover, a methanol spraying device penetrating through the front-end switching block, a middle-end switching block arranged at the top of the methanol spraying device and connected with the front-end switching block, a rear-end switching block arranged on the middle-end switching block, a methanol distribution block arranged on the rear-end switching block and a methanol double-wall pipe arranged on the methanol distribution block. The alcohol spraying device is obliquely arranged above the air inlet channel and follows the air inlet direction, so that the spraying resistance is reduced; the methanol double-wall pipe is connected to the two transverse sides of the methanol distribution block, and methanol is supplied to the methanol sprayer through the middle-end adapter block and the rear-end adapter block. The external connection type design is adopted, large-scale transformation of an existing engine structure is not needed, the transformation cost and the implementation difficulty are reduced, and the engine is suitable for various types of ship engines.

Description

Technical Field

[0001] This utility model relates to the fields of marine engineering and power systems, and in particular to an external cylinder head intake manifold methanol injection conversion system. Background Technology

[0002] With increasing global emphasis on environmental protection and sustainable development, the shipbuilding industry is accelerating its green energy transition strategy. Against this backdrop, methanol-fueled dual-fuel engines, due to their clean and efficient characteristics, are gradually becoming a hot research area. Methanol, as a renewable resource, has significant advantages such as wide availability and clean combustion, effectively reducing carbon and pollutant emissions during ship operations and meeting the increasingly stringent environmental regulations of the International Maritime Organization (IMO).

[0003] Methanol dual-fuel engines are mainly classified into two types based on their methanol injection method: direct injection and port direct injection. While direct injection technology can achieve higher combustion efficiency, its modification is more difficult and it has higher requirements for fuel adaptability, limiting its widespread application in existing marine engines. In contrast, the port direct injection methanol dual-fuel engine, with its advantages of lower modification difficulty, better fuel adaptability, and better combustion stability, demonstrates stronger market competitiveness and development potential, making it a highly attractive option in the current marine power field.

[0004] However, despite the numerous advantages of cylinder head port direct injection methanol dual-fuel engines, research and application in this field are still in their early stages. Most existing research remains at the conceptual design level, lacking detailed design and optimization of key components. In particular, the cylinder head port direct injection conversion system, a core component for achieving efficient methanol injection and stable engine operation, has received little attention regarding its design details and engineering implementation. This technological gap not only limits the further development of methanol dual-fuel engines but also hinders the shipbuilding industry's green energy transition. Utility Model Content

[0005] The purpose of this invention is to provide a novel external cylinder head intake manifold methanol direct injection adapter system. Through innovative structural design and sealing purging measures, it ensures the safety, reliability, and efficiency of the methanol injection process, while reducing the difficulty of modification, improving fuel adaptability and combustion stability, and providing solid technical support for the large-scale application of methanol dual-fuel engines.

[0006] To achieve the above objectives, the present invention provides an external cylinder head intake manifold methanol injection conversion system, comprising a cylinder head, a front-end conversion block located at one end of the top of the cylinder head, an methanol injector passing through the front-end conversion block, a middle conversion block located on top of the methanol injector and connected to the front-end conversion block, a rear-end conversion block located on the middle conversion block, a methanol distribution block located on the rear-end conversion block, and a methanol double-walled pipe located on the methanol distribution block; the methanol injector is inclined above the intake manifold, conforming to the intake direction to reduce injection resistance; the methanol double-walled pipe is connected to both lateral sides of the methanol distribution block, supplying methanol to the methanol injector through the middle conversion block and the rear-end conversion block.

[0007] Preferably, the intermediate adapter block is fixed to the connector of the alcohol sprayer by a threaded connection, serving to connect the alcohol sprayer and the rear adapter block; the rear adapter block is fixed to the intermediate adapter block by bolts four and five, and is connected to the methanol distribution block by long bolts and nuts, making the entire adapter system more stable and easy to disassemble and maintain.

[0008] Preferably, the methanol distribution block has a complex internal piping structure for distributing methanol to each of the methanol injectors; the methanol distribution block is connected to the rear adapter block by the long bolts and the nuts to ensure that methanol does not leak during the distribution process.

[0009] Preferably, the front-end adapter block is fixed to the cylinder head by four bolts and one bolt, and the asymmetrical fixing method ensures the compression state and avoids interference with the cylinder head cover.

[0010] Preferably, the methanol injector is connected to the front-end adapter block by threads and sealed with a sealing ring to ensure that methanol does not leak during injection.

[0011] Preferably, the methanol double-walled tube includes an inner tube, a support block, and an outer tube. The inner tube is located inside the outer tube, and the outer surface of the inner tube is connected to the inner surface of the outer tube through the support block. The support block is provided with multiple grooves along its axis for nitrogen purging.

[0012] Preferably, the outer tube has a welding point at the corresponding position of the support block, so that the inner tube and the outer tube are welded together, thereby improving the stability of the system.

[0013] Preferably, the methanol injector is routed through a cable port on one side of the top to ensure electrical connection; the methanol injector is connected to the intermediate adapter block through a through hole in the center of the top for methanol flow.

[0014] Preferably, the rear-end transfer block is provided with methanol purge hole one and methanol purge hole two in the middle. After the machine stops, nitrogen gas is blown from the methanol double-wall pipe to the methanol distribution block, the rear-end transfer block and the middle transfer block, and the residual methanol in the methanol injector is extracted by the pressure difference to ensure that there is no methanol residue in the system.

[0015] Preferably, the methanol distribution block has a process port one connected to the methanol delivery port via a main pipe, and a process port two connected to the purging port via a purging pipe; the port is for methanol venting, and when the blockage of the process port one fails, the overflowing methanol can flow into the methanol purging port through the port to prevent methanol leakage.

[0016] In summary, this utility model has the following beneficial technical effects:

[0017] This invention, through the dual design of a methanol purging hole and a methanol venting hole, ensures the complete discharge of residual methanol in the methanol injector after shutdown, avoiding the accumulation of methanol in the system and significantly improving the system's safety. The welded structure of the inner and outer pipes of the methanol double-walled tube and the groove design of the support block enhance the system's sealing and stability, effectively preventing methanol leakage.

[0018] The methanol injector is angled above the intake manifold, aligning with the intake direction to reduce injection resistance and ensure efficient methanol entry into the combustion chamber, thus improving combustion efficiency. The front-end adapter block uses an asymmetrical bolt fixing method, ensuring a tight seal between the injector and cylinder head to prevent methanol leakage, while also avoiding interference with other mounting components such as the cylinder head cover, ensuring overall system stability. The separate design of the mid-end adapter block, rear-end adapter block, and methanol distribution block makes the system easier to process, replace, and maintain, reducing manufacturing and maintenance costs.

[0019] The complex internal piping structure of the methanol distribution block ensures uniform methanol distribution, and the combination of sealing rings and long bolts further enhances system reliability. The rational layout of process ports and purge pipes ensures smooth methanol flow within the system, avoiding the risks of blockages and leaks.

[0020] This invention improves fuel adaptability and ensures combustion stability under different operating conditions by optimizing the methanol injection path and distribution method, providing technical support for the widespread application of methanol dual-fuel engines. Through the dual protection of nitrogen purging and a methanol vent, the system achieves zero methanol residue, reducing the potential environmental hazards of methanol and meeting the strategic requirements of green energy transition. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of the external cylinder head intake manifold methanol injection transfer system of this utility model;

[0022] Figure 2 This is an enlarged schematic diagram of the front-end adapter block in the external cylinder head intake manifold methanol injection adapter system of this utility model.

[0023] Figure 3 This is an exploded view of the middle transfer block, the rear transfer block, and the methanol distribution block in the external cylinder head intake manifold methanol injection transfer system of this utility model.

[0024] Figure 4 This is a cross-sectional view of the overall structure of the external cylinder head intake manifold methanol injection transfer system of this utility model;

[0025] Figure 5 This is a schematic diagram of the methanol distribution block in the external cylinder head intake manifold methanol injection transfer system of this utility model.

[0026] Figure 6 This is an enlarged schematic diagram of the methanol double-walled pipe in the external cylinder head intake manifold methanol injection transfer system of this utility model.

[0027] Reference numerals: 1. Cylinder head; 2. Front-end adapter block; 3. Methanol injector; 4. Middle-end adapter block; 5. Rear-end adapter block; 6. Methanol distribution block; 7. Methanol double-wall pipe; 8. Pressure block; 9. Bolt 1; 10. Bolt 2; 11. Bolt 3; 12. Cable port; 13. Through hole; 14. Bolt 4; 15. Bolt 5; 16. Nut; 17. Long bolt; 18. Sealing ring; 19. Methanol purge hole 1; 20. Methanol purge hole 2; 21. Process hole 1; 22. Process hole 2; 23. Main pipe; 24. Purge pipe; 25. Purge hole; 26. Methanol delivery hole; 27. Hole; 28. Inner pipe; 29. ​​Support block; 30. Outer pipe; 31. Weld point. Detailed Implementation

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0029] This utility model discloses an external cylinder head intake manifold methanol injection adapter system. Its design is reasonable, with tight connections between components and easy maintenance. Through various sealing and purging measures, the safety and reliability of the methanol injection process are ensured. The system mainly includes a cylinder head 1, a front-end adapter block 2, an injector 3, a middle adapter block 4, a rear-end adapter block 5, a methanol distribution block 6, and a methanol double-walled pipe 7. The injector 3 is connected to the cylinder head 1 via the front-end adapter block 2, and is connected to the methanol double-walled pipe 7 via the middle adapter block 4, the rear-end adapter block 5, and the methanol distribution block 6.

[0030] The cylinder head 1 is one of the core components of the entire methanol injection adapter system. It is typically a complex metal structure with multiple holes and slots for mounting other components and pipes. The cylinder head 1 is located on top of the engine and is connected to the methanol injector 3 via a front adapter block 2. The front adapter block 2 is fixed to the cylinder head 1 by four bolts 9 and one bolt 10. This asymmetrical fixing method ensures a tight seal between the methanol injector and the cylinder head, preventing methanol leakage, while also avoiding interference with other mounting components such as the cylinder head cover.

[0031] Two methanol injectors 3 are mounted on the front adapter block 2 and secured by pressure block 8 and bolts 11. The methanol injectors 3 are arranged at an angle above the air intake, in line with the air intake direction, to reduce injection resistance; the methanol injectors 3 are connected to the front adapter block 2 by threads and sealed by sealing ring 18 to ensure that methanol does not leak during injection.

[0032] The intermediate adapter block 4 is fixed to the connector of the alcohol sprayer 3 by a threaded connection, serving to connect the alcohol sprayer 3 and the rear adapter block 5. The rear adapter block 5 is fixed to the intermediate adapter block 4 by bolts 14 and 15, and is connected to the methanol distribution block 6 by eight long bolts 17 and nuts 16, making the entire adapter system more stable and easy to disassemble and maintain.

[0033] The methanol distribution block 6 is a crucial component of the methanol injection system, featuring a complex internal piping structure for distributing methanol to each injector. The methanol distribution block 6 is connected to the rear adapter block 5 via long bolts 17 and nuts 16, ensuring no leakage during distribution. The methanol double-walled pipe 7 connects to both sides of the methanol distribution block 6, supplying methanol to the injectors 3 via the middle adapter block 4 and the rear adapter block 5. The methanol double-walled pipe 7 comprises an inner pipe 28, a support block 29, and an outer pipe 30. The inner pipe is located inside the outer pipe, and its outer surface is connected to the inner surface of the outer pipe via the support block. The support block 29 has six axial grooves for nitrogen purging. The outer pipe 30 has a weld point 31 at the same location, welding the inner and outer pipes together to improve system stability.

[0034] The methanol injector 3 is wired through the cable port 12 on one side of the top, ensuring its electrical connection. The methanol injector 3 is connected to the intermediate transition block 4 through the through hole 13 in the center of the top for methanol flow. The intermediate transition block 5 has a methanol purge hole 19 and a methanol purge hole 20 in the middle. After shutdown, nitrogen gas is blown from the methanol double-wall pipe 7 to the methanol distribution block 6, the intermediate transition block 5 and the intermediate transition block 4, using the pressure difference to extract the residual methanol in the methanol injector, ensuring that there is no methanol residue in the system and improving safety.

[0035] The methanol distribution block 6 has a process port 1 21 connected to the two methanol delivery ports 26 via the main pipe 23, and a process port 22 connected to the purge port 25 via the purge pipe 24. During operation, methanol flows through these ports and pipes to the methanol injector 3 (e.g., Figure 4 and Figure 5 (As indicated by the middle arrow). Hole 27 is a methanol vent. When the blockage of process hole 21 fails, the overflowing methanol can flow into the methanol purge hole through hole 27, serving as a second sealing measure to prevent methanol leakage and further improving the stability and safety of the system.

[0036] During operation, the methanol injector 3 and the methanol double-walled pipe 7 are connected via the middle transition block 4, the rear transition block 5, and the methanol distribution block 6, injecting methanol into the intake duct. The methanol and high-pressure air enter the combustion chamber together for combustion. After shutdown, nitrogen gas is blown from the methanol double-walled pipe 7 to the methanol distribution block 6, the rear transition block 5, and the middle transition block 4. The rear transition block 5 is equipped with methanol purging hole 19 and methanol purging hole 20. The pressure difference is used to extract the residual methanol in the methanol injector, ensuring that there is no methanol residue in the system and improving safety.

[0037] This external methanol inlet direct injection converter system has the following advantages and highlights:

[0038] 1. The alcohol injector 3 is arranged at an angle above the air intake, in line with the air intake direction, to reduce injection resistance.

[0039] 2. The methanol vent serves as a second safety measure to prevent leakage, improving the stability and safety of the methanol intake direct injection transfer system.

[0040] 3. The rear-end adapter block 5 is equipped with methanol purge port 19 and methanol purge port 20, which are connected to purge port 25. After the machine stops, the unburned methanol is drawn into the main methanol purge port, so that there is no methanol residue in the system, ensuring the safety of the intake direct injection methanol adapter system.

[0041] 4. The front-end adapter block 2 is fixed asymmetrically with 5 bolts, which ensures that the methanol injector and cylinder head are in a compressed state to prevent methanol leakage, and at the same time prevents interference with cylinder head mounting components such as cylinder head cover.

[0042] 5. The support block 29 has 6 grooves along the axis for nitrogen purging, and the outer tube 30 has a welding point 31 at the same position, so that the inner and outer tubes are welded together, which improves the stability of the system.

[0043] This utility model's methanol transfer structure, consisting of a mid-end transfer block 4, a rear-end transfer block 5, and a methanol distribution block 6, is easier to process, replace, and maintain than a one-piece structure. This utility model not only reduces the difficulty of modification but also improves fuel adaptability and combustion stability, providing strong support for the development of methanol dual-fuel engines.

[0044] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. An external cylinder head intake manifold methanol injection adapter system, characterized in that, The system includes a cylinder head (1), a front-end adapter block (2) located at one end of the top of the cylinder head (1), an alcohol injector (3) passing through the front-end adapter block (2), a middle adapter block (4) located on the top of the alcohol injector (3) and connected to the front-end adapter block (2), a rear-end adapter block (5) located on the middle adapter block (4), a methanol distribution block (6) located on the rear-end adapter block (5), and a methanol double-wall pipe (7) located on the methanol distribution block (6). The alcohol injector (3) is arranged at an angle above the intake manifold, in line with the intake direction, to reduce injection resistance. The methanol double-wall pipe (7) is connected to both sides of the methanol distribution block (6) and supplies methanol to the alcohol injector (3) through the middle adapter block (4) and the rear-end adapter block (5).

2. The external cylinder head intake manifold methanol injection conversion system according to claim 1, characterized in that, The intermediate adapter block (4) is fixed to the connector of the alcohol sprayer (3) by a threaded connection, which serves to connect the alcohol sprayer (3) and the rear adapter block (5); the rear adapter block (5) is fixed to the intermediate adapter block (4) by bolt four (14) and bolt five (15), and is connected to the methanol distribution block (6) by long bolt (17) and nut (16), making the entire adapter system more stable and easy to disassemble and maintain.

3. The external cylinder head intake manifold methanol injection conversion system according to claim 2, characterized in that, The methanol distribution block (6) has a complex internal pipe structure for distributing methanol to each of the methanol sprayers (3); the methanol distribution block (6) is connected to the rear adapter block (5) by the long bolt (17) and the nut (16) to ensure that methanol does not leak during the distribution process.

4. The external cylinder head intake manifold methanol injection conversion system according to claim 3, characterized in that, The front-end adapter block (2) is fixed to the cylinder head (1) by four bolts (9) and one bolt (10). The asymmetrical fixing method ensures the compression state and avoids interference from the cylinder head cover.

5. The external cylinder head intake manifold methanol injection conversion system according to claim 4, characterized in that, The methanol injector (3) is connected to the front-end adapter (2) by a thread and sealed by a sealing ring (18) to ensure that methanol does not leak during the injection process.

6. The external cylinder head intake manifold methanol injection adapter system according to any one of claims 1-5, characterized in that, The methanol double-walled tube (7) includes an inner tube (28), a support block (29) and an outer tube (30). The inner tube (28) is located inside the outer tube (30). The outer surface of the inner tube (28) is connected to the inner surface of the outer tube (30) through the support block (29). The support block (29) has multiple grooves axially for nitrogen purging.

7. The external cylinder head intake manifold methanol injection conversion system according to claim 6, characterized in that, The outer tube (30) has a welding point (31) at the corresponding position on the support block (29), so that the inner tube (28) and the outer tube (30) are welded together, thereby improving the stability of the system.

8. The external cylinder head intake manifold methanol injection conversion system according to claim 7, characterized in that, The methanol sprayer (3) is wired through the cable port (12) on one side of the top to ensure the electrical connection of the methanol sprayer (3); the methanol sprayer (3) is connected to the middle adapter block (4) through the through hole (13) in the center of the top for the flow of methanol.

9. The external cylinder head intake manifold methanol injection adapter system according to any one of claims 1-5, characterized in that, The rear-end adapter block (5) is provided with methanol purge hole one (19) and methanol purge hole two (20) in the middle. After the machine stops, nitrogen gas is blown from the methanol double-wall pipe (7) to the methanol distribution block (6), the rear-end adapter block (5) and the middle adapter block (4) to extract the methanol residue in the methanol injector (3) by using the pressure difference, so as to ensure that there is no methanol residue in the system.

10. The external cylinder head intake manifold methanol injection adapter system according to claim 9, characterized in that, The methanol distribution block (6) is provided with a process hole one (21) which is connected to the methanol delivery hole (26) through the main pipe (23), and a process hole two (22) which is connected to the purging hole (27) through the purging pipe (24). The hole (27) is the methanol venting hole. When the blockage of the process hole one (21) fails, the overflowing methanol can flow into the methanol purging hole through the hole (27) to prevent methanol leakage.

Images