External cylinder cover air inlet channel methanol injection switching system

Abstract

The invention 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 method is suitable for various types of ship engines.

Description

Technical Field

[0001] The present invention relates to the fields of ship engineering and power systems, and particularly to an external cylinder head intake port methanol injection adapter system. Background Art

[0002] With the increasing global emphasis on environmental protection and sustainable development, the ship industry is accelerating the implementation of the green energy transformation strategy. In this context, dual-fuel engines fueled by methanol have gradually become a hot research area due to their clean and efficient characteristics. As a renewable resource, methanol has significant advantages such as wide sources and clean combustion, and can effectively reduce carbon emissions and pollutant emissions during ship operation, meeting the increasingly stringent environmental protection regulations of the International Maritime Organization (IMO).

[0003] Methanol dual-fuel engines are mainly divided into two forms: in-cylinder direct injection and cylinder head intake port direct injection according to the methanol injection method. Although in-cylinder direct injection technology can achieve higher combustion efficiency, its modification difficulty is relatively large, and its requirements for fuel adaptability are relatively high, which limits its widespread application in existing ship engines. In contrast, cylinder head intake port direct injection methanol dual-fuel engines exhibit stronger market competitiveness and development potential due to their low modification difficulty, good fuel adaptability, good combustion stability and other advantages, and have become a very attractive option in the current ship power field.

[0004] However, despite the many advantages of cylinder head intake port direct injection methanol dual-fuel engines, the research and application in this field are still in their infancy. Most of the existing research still remains at the conceptual design level, lacking detailed design and optimization of key components. In particular, the cylinder head intake port methanol direct injection conversion system, as the core component to achieve efficient methanol injection and stable engine operation, there are few reports on its design details and engineering implementation solutions. This technical gap not only restricts the further development of methanol dual-fuel engines, but also hinders the pace of the green energy transformation of the ship industry. Summary of the Invention

[0005] The object of the present invention is to provide a novel external cylinder head intake port methanol direct injection adapter system, so as to ensure the safety, reliability and efficiency of the methanol injection process through innovative structural design and sealing and purging measures, while reducing the modification difficulty, 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 object, the technical solution of the present invention provides an external cylinder head intake port methanol injection adapter system, including a cylinder head, a front adapter block provided at one end of the top of the cylinder head, a methanol injector passing through the front adapter block, a middle adapter block provided on the top of the methanol injector and connected to the front adapter block, a rear adapter block provided on the middle adapter block, a methanol distribution block provided on the rear adapter block, and a methanol double-walled pipe provided on the methanol distribution block; the methanol injector is arranged obliquely above the intake port, conforming to the intake direction to reduce the injection resistance; the methanol double-walled pipe is connected to the transverse sides of the methanol distribution block, and supplies methanol to the methanol injector through the middle adapter block and the rear adapter block.

[0007] Preferably, the middle adapter block is fixed to the joint of the methanol injector by threaded connection, serving to connect the methanol injector and the rear adapter block; the rear adapter block is fixed to the middle adapter block by bolt four and bolt five, and is connected to the methanol distribution block by a long bolt and a nut, making the entire adapter system more stable and facilitating disassembly and maintenance.

[0008] Preferably, the methanol distribution block has a complex pipe structure inside for distributing methanol to each methanol injector; the methanol distribution block is connected to the rear adapter block by the long bolt and the nut to ensure that methanol does not leak during the distribution process.

[0009] Preferably, the front adapter block is fixed to the cylinder head by four bolt one and one bolt two, and the pressing state is ensured by an asymmetric fixing method to avoid interference with the cylinder head cover.

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

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

[0012] Preferably, the outer pipe is provided with welding points at the corresponding positions of the support block to weld the inner pipe and the outer pipe into one body, improving the stability of the system.

[0013] Preferably, the methanol injector realizes wire routing through the cable port on one side of the top to ensure the electrical connection of the methanol injector; the methanol injector is connected to the middle adapter block through the through hole in the center of the top for the circulation of methanol.

[0014] Preferably, a first methanol purging hole and a second methanol purging hole are provided in the middle of the rear-end adapter block. After shutdown, nitrogen is blown from the methanol double-wall pipe to the methanol distribution block, the rear-end adapter block and the middle-end adapter block, and the residual methanol in the methanol injector is extracted by using the pressure difference to ensure that there is no methanol residue in the system.

[0015] Preferably, the methanol distribution block is provided with a first process hole connected to the methanol injection hole through a main pipeline, and a second process hole connected to the purging hole through a purging pipeline; the hole is for methanol to be discharged, and when the plug of the first process hole fails, the overflowing methanol can flow into the methanol purging hole through the hole to prevent methanol leakage.

[0016] In summary, the present invention includes the following beneficial technical effects:

[0017] Through the dual design of the methanol purging hole and the methanol discharge hole, the present invention ensures the complete discharge of the residual methanol in the methanol injector after shutdown, avoids the accumulation of methanol in the system, and significantly improves the safety of the system; the welded structure of the inner and outer pipes of the methanol double-wall pipe and the groove design of the support block enhance the sealing performance and stability of the system, effectively preventing methanol leakage.

[0018] The methanol injector is inclined above the intake passage, conforming to the intake direction, reducing the injection resistance, ensuring that methanol can efficiently enter the combustion chamber, and improving the combustion efficiency. The front-end adapter block adopts an asymmetric bolt fixing method, which not only ensures the pressing state between the methanol injector and the cylinder head to prevent methanol leakage, but also avoids interference with the installation components such as the cylinder head cover, ensuring the overall stability of the system. The split design of the middle-end adapter block, the rear-end adapter block and the methanol distribution block makes the system easier to process, replace and maintain, reducing the manufacturing and maintenance costs.

[0019] The complex pipeline structure inside the methanol distribution block ensures the uniform distribution of methanol. Combined with the fastening design of the sealing ring and the long bolt, the reliability of the system is further improved. The reasonable layout of the process holes and the purging pipelines ensures the smooth flow of methanol in the system, avoiding the risks of blockage and leakage.

[0020] By optimizing the methanol injection path and distribution method, the present invention improves the adaptability of the fuel, ensures the combustion stability under different working conditions, and provides technical support for the wide application of methanol dual-fuel engines. Through the dual guarantee of nitrogen purging and the methanol discharge hole, the system achieves zero residue of methanol, reduces the potential harm of methanol to the environment, and meets the strategic requirements of the green energy transformation. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall structure of an external cylinder head intake passage methanol injection adapter system of the present invention;

[0022] Figure 2 This is an enlarged schematic view of the front adapter block in an externally connected cylinder head intake port methanol injection adapter system of the present invention;

[0023] Figure 3 This is an exploded view of the middle adapter block, rear adapter block and methanol distribution block in an externally connected cylinder head intake port methanol injection adapter system of the present invention;

[0024] Figure 4 This is a sectional view of the overall structure of an externally connected cylinder head intake port methanol injection adapter system of the present invention;

[0025] Figure 5 This is a schematic view of the methanol distribution block in an externally connected cylinder head intake port methanol injection adapter system of the present invention;

[0026] Figure 6 This is an enlarged schematic view of the methanol double-wall pipe in an externally connected cylinder head intake port methanol injection adapter system of the present invention.

[0027] Reference numerals: 1, cylinder head; 2, front adapter block; 3, methanol injector; 4, middle adapter block; 5, rear adapter block; 6, methanol distribution block; 7, methanol double-wall pipe; 8, pressing block; 9, bolt one; 10, bolt two; 11, bolt three; 12, cable port; 13, through hole; 14, bolt four; 15, bolt five; 16, nut; 17, long bolt; 18, sealing ring; 19, methanol purge hole one; 20, methanol purge hole two; 21, process hole one; 22, process hole two; 23, main pipeline; 24, purge pipeline; 25, purge hole; 26, methanol delivery hole; 27, hole; 28, inner pipe; 29, support block; 30, outer pipe; 31, solder joint. Detailed implementation manners

[0028] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0029] The present invention discloses an externally connected cylinder head intake port methanol injection adapter system, which is reasonably designed, the connections between components are tight and easy to maintain, and 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 adapter block 2, a methanol injector 3, a middle adapter block 4, a rear adapter block 5, a methanol distribution block 6 and a methanol double-wall pipe 7. The methanol injector 3 is connected to the cylinder head 1 through the front adapter block 2, and is connected to the methanol double-wall pipe 7 through the middle adapter block 4, the rear 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 usually a complex metal structure with multiple holes and grooves for installing other components and pipes. The cylinder head 1 is located at the top of the engine and is connected to the methanol injector 3 through the front adapter block 2. The front adapter block 2 is fixed to the cylinder head 1 by four bolts one 9 and one bolt two 10. This asymmetric fixing method not only ensures the pressing state between the methanol injector and the cylinder head to prevent methanol leakage but also avoids interference with installation components such as the cylinder head cover.

[0031] Two methanol injectors 3 are installed on the front adapter block 2 and fixed by the pressure block 8 and bolt three 11. The methanol injector 3 is arranged obliquely above the intake port, conforming to the intake direction to reduce the injection resistance. The methanol injector 3 is connected to the front adapter block 2 by a thread and sealed by the sealing ring 18 to ensure that methanol does not leak during the injection process.

[0032] The middle adapter block 4 is fixed to the connector of the methanol injector 3 by a thread connection, serving to connect the methanol injector 3 and the rear adapter block 5. The rear adapter block 5 is fixed to the middle adapter block 4 by bolt four 14 and bolt five 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 facilitating disassembly and maintenance.

[0033] The methanol distribution block 6 is an important part of the methanol injection system. It has a complex pipeline structure inside for distributing methanol to each methanol injector. The methanol distribution block 6 is connected to the rear adapter block 5 by long bolts 17 and nuts 16 to ensure that methanol does not leak during the distribution process. The methanol double-wall pipe 7 is connected to the two lateral sides of the methanol distribution block 6 and supplies methanol to the methanol injector 3 through the middle adapter block 4 and the rear adapter block 5. The methanol double-wall pipe 7 includes an inner pipe 28, a support block 29, and an outer pipe 30. The inner pipe is located inside the outer pipe, and the outer surface of the inner pipe is connected to the inner surface of the outer pipe through the support block. The support block 29 has six grooves axially for nitrogen purging, and the outer pipe 30 has solder joints 31 at the same position to weld the inner and outer pipes together, improving the stability of the system.

[0034] The methanol injector 3 routes wires through the cable port 12 on one side of the top to ensure the electrical connection of the methanol injector 3. The methanol injector 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. The middle of the rear adapter block 5 is provided with a methanol purge hole one 19 and a methanol purge hole two 20. After shutdown, nitrogen blows from the methanol double-wall pipe 7 to the methanol distribution block 6, the rear adapter block 5, and the middle adapter block 4, and uses 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 is provided with a first process hole 21 which is connected to two alcohol delivery holes 26 through the main pipeline 23, and a second process hole 22 which is connected to the purge hole 25 through the purge pipeline 24. During operation, methanol flows through these holes and pipelines to the alcohol injector 3 (as shown by the arrows in Figure 4 and Figure 5 ). The hole 27 is a methanol drain hole. When the plug of the first process hole 21 fails, the overflowing methanol can flow into the methanol purge hole through the hole 27, which serves as the second sealing means to prevent methanol leakage and further improves the stability and safety of the system.

[0036] During operation, the alcohol injector 3 is connected to the methanol double-wall pipe 7 through the middle adapter block 4, the rear adapter block 5 and the methanol distribution block 6, and injects methanol into the intake passage. Methanol and high-pressure air enter the combustion chamber together to prepare for combustion. After shutdown, nitrogen blows from the methanol double-wall pipe 7 to the methanol distribution block 6, the rear adapter block 5 and the middle adapter block 4. The rear adapter block 5 is provided with a first methanol purge hole 19 and a second methanol purge hole 20. The residual methanol in the alcohol injector is pumped out by using the pressure difference to ensure that there is no methanol residue in the system and improve the safety.

[0037] This externally-connected methanol intake direct injection adapter system has the following advantages and highlights:

[0038] 1. The alcohol injector 3 is inclined above the intake passage, conforming to the intake direction and reducing the injection resistance.

[0039] 2. The methanol drain hole serves as the second safeguard against leakage, improving the stability and safety of the methanol intake direct injection adapter system.

[0040] 3. The rear adapter block 5 is provided with a first methanol purge hole 19 and a second methanol purge hole 20, which are connected to the purge hole 25. After shutdown, the unburned methanol is sucked into the main methanol purge hole, ensuring that there is no methanol residue in the system and guaranteeing the safety of the intake direct injection methanol adapter system.

[0041] 4. The front adapter block 2 is asymmetrically fixed with 5 bolts, which not only ensures that the alcohol injector and the cylinder head are in a compressed state to prevent methanol leakage, but also prevents interference with the cylinder head installation components such as the cylinder head cover.

[0042] 5. The support block 29 has 6 grooves axially for nitrogen purging, and the outer pipe 30 is provided with a welding point 31 at the same position, welding the inner and outer pipes into one body, improving the stability of the system.

[0043] The methanol adapter structure of the present invention composed of the middle adapter block 4, the rear adapter block 5 and the methanol distribution block 6 is easier to process, replace and repair than the integral structure. The present invention not only reduces the modification difficulty, but also improves the 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 are only preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention 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 perform equivalent replacements on some of the technical features. Any modifications, equivalent replacements, 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. An external cylinder head intake duct methanol injection adapter system, characterized in that: The invention comprises a cylinder head (1), a front end adapter block (2) arranged at one end of the top of the cylinder head (1), an alcohol sprayer (3) passing through the front end adapter block (2), a middle end adapter block (4) arranged at the top of the alcohol sprayer (3) and connected to the front end adapter block (2), a rear end adapter block (5) arranged on the middle end adapter block (4), a methanol distribution block (6) arranged on the rear end adapter block (5), and a methanol double-walled pipe (7) arranged on the methanol distribution block (6); the alcohol sprayer (3) is arranged obliquely above the intake passage to follow the intake direction and reduce the injection resistance; the methanol double-walled pipe (7) is connected to the lateral sides of the methanol distribution block (6) to supply methanol to the alcohol sprayer (3) through the middle end adapter block (4) and the rear end adapter block (5).

2. The external cylinder head intake port methanol injection adapter system according to claim 1, characterized in that: The middle-end adapter block (4) is fixed to the joint of the alcohol sprayer (3) by threaded connection, and serves to connect the alcohol sprayer (3) and the rear-end adapter block (5); the rear-end adapter block (5) is fixed to the middle-end adapter block (4) by bolt four (14) and bolt five (15), and is connected to the methanol distribution block (6) by long bolts (17) and nuts (16), so that the entire adapter system is more stable and easy to disassemble and maintain.

3. The external cylinder head intake port methanol injection adapter system according to claim 2, characterized in that: The methanol distribution block (6) has a complex pipeline structure inside, which is used to distribute methanol to each of the alcohol sprayers (3); the methanol distribution block (6) is connected to the rear end adapter block (5) through the long bolts (17) and the nuts (16) to ensure that methanol will not leak during the distribution process.

4. The external cylinder head intake port methanol injection adapter system according to claim 3, characterized in that: The front end adapter block (2) is fixed to the cylinder head (1) by means of four first bolts (9) and one second bolt (10), and a tightening state is ensured by means of an asymmetric fixing method, while avoiding interference with the cylinder head cover.

5. The external cylinder head intake port methanol injection adapter system according to claim 4, characterized in that: The alcohol sprayer (3) is connected to the front end adapter block (2) via threads and is sealed via a sealing ring (18) to ensure that methanol does not leak during the spraying process.

6. The external cylinder head intake duct methanol injection adapter system according to any one of claims 1 to 5, characterized in that: The methanol double-walled tube (7) comprises 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) via the support block (29); and the support block (29) is axially provided with a plurality of grooves for nitrogen purging.

7. The external cylinder head intake port methanol injection adapter system according to claim 6, characterized in that: The outer tube (30) is provided with a welding point (31) at a position corresponding to the support block (29), so that the inner tube (28) and the outer tube (30) are welded together to improve the stability of the system.

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

9. The external cylinder head intake port methanol injection adapter system according to any one of claims 1 to 5, characterized in that: A methanol purge hole 1 (19) and a methanol purge hole 2 (20) are provided in the middle of the rear end adapter block (5). After shutdown, nitrogen is blown from the methanol double-walled pipe (7) to the methanol distribution block (6), the rear end adapter block (5) and the middle end adapter block (4), and the residual methanol in the alcohol sprayer (3) is extracted by pressure difference to ensure that there is no methanol residue in the system.

10. The external cylinder head intake port methanol injection adapter system according to claim 9, characterized in that: The methanol distribution block (6) is provided with a process hole 1 (21) connected to the methanol delivery hole (26) through a main pipeline (23), and is provided with a process hole 2 (22) connected to the purge hole (27) through a purge pipeline (24); the hole (27) is used for methanol discharge, and when the plug of the process hole 1 (21) fails, the overflowed methanol can flow into the methanol purge hole through the hole (27), thereby preventing methanol leakage.

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