A methanol diesel dual fuel engine methanol injection combustion equipment

Abstract

The utility model discloses a kind of methanol diesel dual-fuel engine methanol injection combustion equipment, belong to new fuel engine technical field, including methanol rail, methanol rail one side outer surface welds into alcohol pipe, alcohol pipe far from methanol rail one end outer surface fixedly connected with alcohol sprayer, alcohol sprayer is fixed on intake branch pipe, intake branch pipe is connected in cylinder head intake passage, cylinder head intake passage can be used as methanol mixing chamber, the angle of methanol that alcohol sprayer sprays and intake passage premixing chamber center line horizontal angle is less than 30 °;Fuel enters cylinder inner pipeline is divided into fuel oil circuit and methanol pipeline, fuel oil circuit remains unchanged, fuel injection pump is driven by camshaft, pressurized fuel, enter fuel injector by fuel branch pipe, spray into cylinder and burn, this pipeline can be separated from methanol pipeline independent operation, so engine can be operated in pure diesel mode;Methanol pipeline then sequentially enters intake branch pipe, cylinder head intake passage, intake valve by alcohol sprayer, into cylinder and participate in combustion.

Description

Technical Field

[0001] This utility model relates to the field of new fuel engine technology, and more specifically, to a methanol injection combustion device for a methanol-diesel dual-fuel engine. Background Technology

[0002] Currently, methanol / diesel dual-fuel engines generally employ either direct methanol injection or methanol premixing via the intake manifold. Direct methanol injection is typically used in two-stroke low-speed engines because the cylinder head of low-speed engines has a larger volume and ample space, allowing for the placement of one fuel injector and one methanol injector. However, four-stroke medium-speed engines have less available space in the cylinder head, making it difficult to accommodate an additional methanol injector without significant modifications to the cylinder head. Therefore, methanol premixing via the intake manifold is generally the only option. This patent utilizes a sequential injection method via the methanol intake manifold branch pipe, injecting methanol into the cylinder for combustion. The drawbacks of existing technologies are: direct methanol injection is difficult to achieve in marine medium-speed four-stroke high-power diesel engines, while methanol premixing via the intake manifold often results in excessive methanol contact with the cylinder walls, leading to methanol condensation, prolonged methanol accumulation in the intake manifold, uneven methanol distribution across cylinders, poor methanol utilization, and low methanol substitution rates. These issues urgently require improvement.

[0003] In summary, how to provide a methanol injection combustion device for a methanol-diesel dual-fuel engine is a problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0004] In view of this, the purpose of this utility model is to provide a methanol injection combustion device for a methanol-diesel dual-fuel engine.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A methanol injection combustion device for a methanol-diesel dual-fuel engine includes a methanol rail. An inlet pipe is welded to the outer surface of one side of the methanol rail. An injector is fixedly connected to the outer surface of the inlet pipe at the end away from the methanol rail. An extension cylinder is fixedly connected to the outer surface of the injector. An intake premixing chamber is provided on the inner surface of the extension cylinder. The angle of the methanol injected by the injector with the horizontal angle of the center line of the intake premixing chamber is less than 30°. The injector is correspondingly fixedly connected to the intake branch pipe.

[0007] On the other hand, one end of the methanol injector is connected to an angle adjustment mechanism, which is used to adjust the angle of the methanol injected by the methanol injector and the horizontal angle between the center line of the premixing chamber of the air intake.

[0008] On the other hand, the extended cylinder is provided with a fixing seat on the outer surface of the alcohol sprayer, and the extended cylinder is provided with a fixing hole on the outer surface next to the fixing seat.

[0009] On the other hand, the expansion cylinder has a branch flange on its outer surface next to the fixed seat, and external connecting flanges are provided on the outer surfaces of both sides of the expansion cylinder.

[0010] On the other hand, a main body shell is fixedly connected to the outer surface of the methanol rail, and a camshaft is installed on the inner surface of the main body shell.

[0011] On the other hand, an injection pump is fixedly connected to the outer surface of the camshaft, and an ECU flow monitor is provided on the outer surface of the output end of the injection pump.

[0012] On the other hand, an oil inlet branch pipe is fixedly connected to the outer surface of the ECU flow monitor, and the outer surface of the other end of the oil inlet branch pipe is fixedly connected to the expansion cylinder.

[0013] On the other hand, the main body shell is provided with an injector on the inner surface of the premixing chamber of the air intake.

[0014] On the other hand, the main body housing is provided with an air intake valve on the inner surface of the injector, and the air intake valve and the injector are in the same passage.

[0015] On the other hand, the outer surface of the expansion cylinder is coated with red anti-rust paint, and the inside of the expansion cylinder is coated with water-resistant anti-rust topcoat with a paint film thickness of 35~45μm.

[0016] This utility model provides a methanol injection combustion device for a methanol-diesel dual-fuel engine. In this application, the original oil inlet is extended to connect to an expansion cylinder. The original oil circuit is changed to a one-to-two, three-way oil circuit. One end enters from the original route, and the oil inlet branch pipe is connected to the expansion cylinder. The other end enters the expansion cylinder through the methanol injector. The passage between the methanol injector and the oil inlet branch pipe is mixed through the intake premixing chamber. Then, the fuel is sent into the combustion chamber through the intake valve at the position connected to the injector. The angle of the methanol injected by the methanol injector is less than 30° from the horizontal angle of the center line of the intake premixing chamber. This ensures that the methanol injected by the methanol injector can basically enter the cylinder when the methanol injector is working. The injection time of the methanol injector is within the intake cycle. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or related technologies, the drawings used in the description of the embodiments or related technologies will be briefly introduced below. Obviously, the drawings described below are only embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the overall shape of a specific embodiment provided by this utility model;

[0019] Figure 2A schematic diagram of a single cylinder cross-section provided for a specific embodiment of this utility model;

[0020] Figure 3 A front view of the extended cylinder provided in a specific embodiment of this utility model;

[0021] Figure 4 The bottom of the extended cylinder is shown in the specific embodiment provided by this utility model;

[0022] Figure 5 The side view of the extended cylinder is provided for a specific embodiment of this utility model;

[0023] Figure 6 External engineering drawing of the side of the extended cylinder for a specific embodiment of this utility model;

[0024] Figure 7 The diagram shows the fixed end of the extended cylinder in a specific embodiment of this utility model.

[0025] Figure label:

[0026] 1-Methanol rail; 2-Methanol inlet pipe; 3-Methanol injector; 4-Extension cylinder; 5-Intake premixing chamber; 6-Injection pump; 7-Inlet branch pipe; 8-Main body housing; 9-ECU flow monitor; 10-Injector; 11-Intake valve; 12-Mount; 13-Mount hole; 14-Branch flange; 15-External connection flange; 16-Camshaft. Detailed Implementation

[0027] 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 scope of protection of the present utility model.

[0028] The core of this utility model is to provide a methanol injection combustion device for a methanol-diesel dual-fuel engine.

[0029] Please refer to Figures 1-6A methanol injection combustion device for a methanol-diesel dual-fuel engine includes a methanol rail 1. An inlet pipe 2 is welded to the outer surface of one side of the methanol rail 1. An injector 3 is fixedly connected to the outer surface of the end of the inlet pipe 2 away from the methanol rail 1. An extension cylinder 4 is fixedly connected to the outer surface of the injector 3. An intake premixing chamber 5 is provided on the inner surface of the extension cylinder 4. The angle of the methanol injected by the injector 3 with the horizontal angle of the centerline of the intake premixing chamber 5 is less than 30°. The injector 3 is correspondingly fixedly connected to the intake branch pipe. Specifically, in this application, the intake branch pipe is connected to the cylinder head intake manifold, which can serve as a methanol mixing chamber. The extension cylinder 4 is extended and connected to the original fuel inlet end, changing the original fuel line into a two-way three-way fuel line, one of which is for fuel oil. One path is a methanol pipeline, with one end entering from the original route, passing through the injection pump 6 to the injector 10, and entering the cylinder to participate in combustion. The fuel inlet branch pipe 7 is connected to the expansion cylinder 4, and the other end enters the expansion cylinder 4 through the methanol injector 3. The passage between the methanol injector 3 and the fuel inlet branch pipe 7 is mixed through the intake premixing chamber 5, and then the fuel is sent into the combustion chamber through the intake valve 11 at the position connected to the injector 10. The angle of the methanol sprayed by the methanol injector 3 is less than 30° from the horizontal angle of the center line of the intake premixing chamber 5, so that the methanol sprayed when the methanol injector 3 is working can basically enter the cylinder. The injection time of the methanol injector 3 is within the intake cycle. The traditional fuel circuit has not been modified in any way. Even if the methanol pipeline is removed, it can still operate as a pure diesel system.

[0030] Furthermore, to ensure that the angle of the methanol sprayed by the methanol injector 3 is less than 30° with the horizontal angle between the center line of the premixing chamber 5 and the center line of the premixing chamber 5, an angle adjustment mechanism can be connected to one end of the methanol injector 3. This angle adjustment mechanism is used to adjust the horizontal angle between the angle of the methanol sprayed by the methanol injector 3 and the center line of the premixing chamber 5. This angle adjustment mechanism can be specifically manifested as: a gear meshing mechanism, a connecting rod-slider mechanism, a lead screw / screw transmission mechanism, or other mechanical structures that can achieve the same effect. No specific limitation is made here.

[0031] The expansion cylinder 4 is provided with a fixing seat 12 on the outer surface of the alcohol sprayer 3. The expansion cylinder 4 is provided with a fixing hole 13 on the outer surface next to the fixing seat 12. Specifically, the fixing seat 12 provides a stable and effective installation method for the fixed connection of the alcohol sprayer 3 and the angle fixation. The fixing hole 13 facilitates the use of external fasteners, which can be screwed into the alcohol sprayer 3 to fix it.

[0032] The expansion cylinder 4 has a branch flange 14 on its outer surface next to the fixed base 12, and external connection flanges 15 on both outer surfaces of the expansion cylinder 4. Specifically, the branch flange 14 facilitates the expansion cylinder 4 to fix the original route and complete the expansion, while the external connection flanges 15 facilitate the external fixation of the expansion cylinder 4.

[0033] The outer surface of the methanol rail 1 is fixedly connected to the main housing 8, and the inner surface of the main housing 8 is equipped with a camshaft 16. Specifically, the main housing 8 is a major component of the engine, and its interior may be assembled from multiple modules. For better description, it can be understood as an integrated unit. The engine uses the camshaft 16 to allow diesel fuel to enter the equipment.

[0034] A fuel injection pump 6 is fixedly connected to the outer surface of the camshaft 16, and an ECU flow monitor 9 is installed on the outer surface of the output end of the fuel injection pump 6. Specifically, the camshaft 16 pressurizes the fuel injection pump 6, and the high-pressure fuel injected by the fuel injection pump 6 enters the fuel injector to atomize diesel fuel, enters the cylinder, and performs power after compression ignition. The ECU flow monitor 9 facilitates logic control through the ECU.

[0035] An oil inlet branch pipe 7 is fixedly connected to the outer surface of the ECU flow monitor 9, and the other end of the oil inlet branch pipe 7 is fixedly connected to the expansion cylinder 4. Specifically, the oil inlet branch pipe 7 facilitates the delivery of the original oil circuit to the expansion cylinder 4, which facilitates the mixing of raw materials and ensures stable combustion.

[0036] The main body shell 8 is equipped with an injector 10 on the inner surface of the premixing chamber 5 of the intake manifold. The engine enters the combustion chamber through the camshaft 16, the injection pump 6, the fuel inlet branch pipe 7, and the injector 10.

[0037] The main body housing 8 is provided with an intake valve 11 on the inner surface of the fuel injector 10. The intake valve 11 and the fuel injector 10 are in the same passage. Specifically, fuel is stably injected into the intake valve 11 through the alcohol injector 3, enters the combustion chamber, and participates in combustion. The opening and closing of the alcohol injector 3 and its duration are controlled by the ECU.

[0038] The outer surface of the expansion cylinder 4 is coated with red anti-rust paint, and the inside of the expansion cylinder 4 is coated with water-resistant anti-rust topcoat with a film thickness of 35~45μm. Specifically, the red anti-rust paint is used to better prevent rust, and the red color serves as a more conspicuous warning, while the water-resistant anti-rust topcoat is used to better ensure the overall durability of the equipment.

[0039] The casting deviation of the un-toleranced dimensions of the extended cylinder 4 shall comply with GB / T6414-CT8; specifically, the extended cylinder 4 needs to be coordinated with the original oil circuit to better and more stably introduce methanol dual fuel into the engine.

[0040] In summary: This application involves optimizing and upgrading an existing diesel engine. The diagram shows an N28 methanol dual-fuel engine, a single-cylinder cross-section. After fuel injection, other related components remained unchanged, such as the combustion chamber, piston rod, and exhaust valve, which will not be discussed in detail here. The main body shell 8, as a major engine component, may be composed of multiple modules. For better clarity, it will be understood as a single unit. The engine, via the camshaft 16, fuel injection pump 6, and fuel inlet manifold 7, injects fuel... In this application, an alcohol injector is installed on the existing intake manifold. The alcohol injector atomizes the methanol, which then enters the intake manifold, mixes with the air inside, and enters the cylinder head intake manifold. After being fully mixed with air in the intake manifold, it enters the intake valve and then the cylinder, where it is combusted with the compressed fuel oil. The angle of the methanol injected by the alcohol injector 3 relative to the horizontal angle of the centerline of the intake manifold premixing chamber 5 is less than 30°, ensuring that the methanol injected by the alcohol injector 3 is essentially homogeneous with the air. The methanol injector 3 can enter the cylinder, and its injection timing is within the intake cycle. The original fuel inlet branch pipe 7 has been extended and equipped with an ECU flow monitor 9, which facilitates logic control via the ECU and controls the methanol injector 3 to ensure the methanol injection sequence and timing for optimal fuel substitution. The mounting base 12 provides a stable and effective installation method for the fixed connection and angle fixation of the methanol injector 3. The fixing hole 13 facilitates the use of external fasteners, which are screwed into and fixed to the methanol injector 3. The branch pipe flange 14 facilitates the fixation of the original route to the expansion cylinder 4, completing the expansion. The external connection flange 15 facilitates the external fixation of the expansion cylinder 4. The methanol rail 1 in this expansion was welded to the outside because the original equipment did not have an internal position reserved. The red anti-rust paint is used for better rust prevention and serves as a more conspicuous warning. The water-resistant anti-rust topcoat ensures the overall durability of the equipment. The overall optimization method is simple and effective, further increasing the utilization rate of methanol in the combustion engine and thus providing a basis for better energy conservation and emission reduction.

[0041] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0042] The methanol injection combustion device for a methanol-diesel dual-fuel engine provided by this utility model has been described in detail above. Specific examples have been used to illustrate the principle and implementation of this utility model. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core idea of ​​this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made to this utility model without departing from the principle of this utility model, and these improvements and modifications also fall within the protection scope of this utility model.

Claims

1. A methanol injection combustion device for a methanol-diesel dual-fuel engine, characterized in that, The system includes a methanol rail (1), an alcohol inlet pipe (2) welded to one outer surface of the methanol rail (1), an alcohol injector (3) fixedly connected to the outer surface of the end of the alcohol inlet pipe (2) away from the methanol rail (1), an expansion cylinder (4) fixedly connected to the outer surface of the alcohol injector (3), an air intake premixing chamber (5) provided on the inner surface of the expansion cylinder (4), the angle of the methanol sprayed by the alcohol injector (3) and the horizontal angle of the center line of the air intake premixing chamber (5) is less than 30°, and the alcohol injector (3) is fixedly connected to the air intake branch pipe.

2. The methanol injection combustion device for a methanol-diesel dual-fuel engine according to claim 1, characterized in that, One end of the methanol sprayer (3) is connected to an angle adjustment mechanism, which is used to adjust the angle of the methanol sprayed by the methanol sprayer (3) and the horizontal angle between the center line of the premixed chamber (5) of the air intake.

3. The methanol injection combustion device for a methanol-diesel dual-fuel engine according to claim 1, characterized in that, The extended cylinder (4) is provided with a fixing seat (12) on the outer surface of the alcohol sprayer (3), and the extended cylinder (4) is provided with a fixing hole (13) on the outer surface next to the fixing seat (12).

4. The methanol injection combustion device for a methanol-diesel dual-fuel engine according to claim 1, characterized in that, The expansion cylinder (4) has a branch flange (14) on its outer surface next to the fixed seat (12), and external connection flanges (15) are provided on both outer surfaces of the expansion cylinder (4).

5. The methanol injection combustion device for a methanol-diesel dual-fuel engine according to claim 1, characterized in that, The outer surface of the methanol rail (1) is fixedly connected to the main body shell (8), and the inner surface of the main body shell (8) is equipped with a camshaft (16).

6. The methanol injection combustion device for a methanol-diesel dual-fuel engine according to claim 5, characterized in that, The outer surface of the camshaft (16) is fixedly connected to the fuel injection pump (6), and the outer surface of the output end of the fuel injection pump (6) is provided with an ECU flow monitor (9).

7. The methanol injection combustion device for a methanol-diesel dual-fuel engine according to claim 6, characterized in that, The outer surface of the ECU flow monitor (9) is fixedly connected to an oil inlet branch pipe (7), and the outer surface of the other end of the oil inlet branch pipe (7) is fixedly connected to the expansion cylinder (4).

8. The methanol injection combustion device for a methanol-diesel dual-fuel engine according to claim 5, characterized in that, The main body shell (8) is provided with an injector (10) on the inner surface of the premix chamber (5) of the air intake.

9. The methanol injection combustion device for a methanol-diesel dual-fuel engine according to claim 8, characterized in that, The main body shell (8) is provided with an air intake valve (11) on the inner surface of the injector (10), and the air intake valve (11) and the injector (10) are in the same passage.

10. A methanol injection combustion device for a methanol-diesel dual-fuel engine according to claim 1, characterized in that, The outer surface of the extended cylinder (4) is coated with red anti-rust paint, and the inside of the extended cylinder (4) is coated with water-resistant anti-rust topcoat with a paint film thickness of 35~45μm.

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