Large-bore methanol power unit air intake integrated device

Abstract

The application discloses a large-bore methanol generator set air intake integrated device, and relates to the field of methanol generator sets, aiming to solve the problems of short mixing path, insufficient atomization and inability to adjust the mixing state according to working conditions of the existing air intake device. The technical scheme is characterized in that the device comprises an air intake pipe section and a mixing pipe section, the air intake pipe section is internally provided with an air intake Venturi pipe, a variable throat is arranged on the contraction section of the air intake Venturi pipe and is adjusted in opening degree by a hydraulic drive movable baffle, alcohol injectors with intersecting angles are arranged at the throat, a premixing pipe with wind wheel driven mixing blades and a mixing pipe section with motor driven mixing flow guide components are sequentially connected downstream of the air intake Venturi pipe, the variable throat is self-adaptively adjusted, multi-stage mixing and cross injection are realized, and sufficient and uniform mixing of methanol and air under full working conditions is realized, which is beneficial to improving the combustion efficiency and reducing emissions.

Description

Technical Field

[0001] This invention relates to the field of methanol generator set technology, specifically to an integrated intake device for a large-diameter methanol generator set. Background Technology

[0002] Marine large-bore methanol generator sets are a new type of power unit that uses methanol as fuel and is applied to the field of marine power supply. Methanol, as a clean and low-carbon alternative fuel, has received widespread attention in the field of marine power. The rapid development of new energy ships, such as methanol-powered ships and methanol / diesel dual-fuel ships, has placed higher demands on the combustion efficiency, operational stability, and emission performance of marine methanol engines. Methanol fuel has combustion characteristics such as high octane number, high latent heat of vaporization, and slow flame propagation speed, which are significantly different from traditional diesel fuel. In large-bore marine methanol generator sets, the mixing mass of methanol and air directly determines the completeness of combustion and the output performance of the engine.

[0003] Existing intake systems typically employ a single-point injection method at the intake manifold or intake duct to inject methanol into the intake line, mix it with pressurized air, and then allow it to enter the cylinder. However, this single-point injection method suffers from problems such as a short mixing path, insufficient methanol atomization, and uneven mixture concentration distribution, leading to incomplete combustion and low thermal efficiency under certain operating conditions, while also resulting in higher emissions of unburned methanol. Furthermore, the high latent heat of vaporization of methanol causes a significant decrease in intake air temperature, further worsening mixing and combustion conditions under low-load conditions. During variable operating conditions, a fixed-structure intake system cannot adjust the mixing state according to changes in intake flow rate, making it difficult to guarantee a good mixing effect across the entire operating range.

[0004] Chinese patent CN211777765U discloses an integrated methanol / diesel dual-fuel engine intake manifold. This intake manifold includes an intake box and intake branch pipes distributed axially along the intake box. An alcohol injection valve interface is located on the opposite side of the intake port of each intake branch pipe. The pressurized air and methanol are mixed within the intake branch pipes to form a homogeneous mixture that enters the engine. While this design achieves pre-mixing of methanol and air within the intake branch pipes, each intake branch pipe has an independently installed alcohol injection valve, resulting in a large number of injectors, a complex structure, and the injection points being close to the cylinders. The mixing path between methanol and air remains relatively short, limiting the uniformity of the mixture. Furthermore, the mixing structure of this intake manifold is a fixed design, unable to adjust the mixing state according to changes in intake flow rate, resulting in insufficient adaptability under different load conditions. Summary of the Invention

[0005] In view of the above situation and to overcome the defects of the prior art, the present invention provides an integrated intake device for a large-diameter methanol generator set.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solution: an integrated intake device for a large-diameter methanol generator set, comprising an intake pipe section and a mixing pipe section connected to the intake pipe section, characterized in that an intake venturi is provided inside the intake pipe section, the constriction section of the intake venturi is provided with a variable throat, movable baffles are slidably provided on both sides of the variable throat, a hydraulic adjustment chamber is provided inside the pipe wall of the intake venturi and is pulsatorically connected to the movable baffles, and a hydraulic oil guide pipe for introducing hydraulic oil is connected to the hydraulic adjustment chamber; The variable throat adjusts its opening size by driving the movable baffle to slide relative to each other through the hydraulic adjustment chamber. This allows for the adjustment of the throat airflow velocity by changing the effective flow area of ​​the throat under different intake flow conditions. This ensures sufficient turbulence intensity at low loads to promote the mixing of methanol and air, and reduces intake resistance at high loads to ensure sufficient intake volume.

[0007] Furthermore, a limiting guide post is fixedly installed inside the hydraulic regulating cavity, and a connecting sliding hole is provided on the movable baffle that slides with the limiting guide post. A spring is sleeved on the surface of the limiting guide post, one end of the spring is fixedly connected to the inner wall of the hydraulic regulating cavity, and the other end of the spring is fixedly connected to the movable baffle. The spring is used to drive the movable baffle to reset when the hydraulic oil pressure decreases, so as to increase the opening area of ​​the variable throat.

[0008] Furthermore, the inner wall of the intake pipe section is fixedly provided with a mounting base, and a number of methanol sprayers are fixedly provided on the mounting base. The spray direction of each methanol sprayer is set towards the variable throat, and the included angle between the spray directions of two adjacent methanol sprayers is 60°-120°, which is used to make the two methanol jets cross and collide in the variable throat area to achieve secondary breakage of methanol droplets.

[0009] Furthermore, a methanol feed pipe is fixedly installed on the intake pipe section. The inlet of the methanol feed pipe extends to the outside of the intake pipe section. The inside of the methanol feed pipe is connected to the inside of each methanol injector. An electromagnetic control valve is installed between the methanol feed pipe and each methanol injector. The electromagnetic control valve is used to independently control the injection timing and injection quantity of each methanol injector according to the engine operating conditions.

[0010] Furthermore, a premixing pipe is fixedly connected to the outlet end of the intake venturi. A fixed frame is fixedly installed inside the premixing pipe. A first rotating rod is rotatably installed on the fixed frame. A first mixing blade is fixedly installed on the first rotating rod. A wind turbine blade is fixedly installed at one end of the first rotating rod. The wind turbine blade is used to convert the kinetic energy of the airflow into rotational power to drive the first mixing blade to rotate, thereby performing secondary mixing of methanol and air.

[0011] Furthermore, the mixing pipe section is provided with a mixing guide assembly inside. The mixing guide assembly includes a limiting frame fixedly installed on the inner wall of the mixing pipe section, a rotating shaft rotatably installed in the limiting frame, a second mixing blade fixedly installed on the surface of the rotating shaft, a connecting rod fixedly connected to the bottom end of the rotating shaft, and a spiral blade fixedly installed on the surface of the connecting rod. The top end of the rotating shaft extends to the outside of the mixing pipe section and is drivenly connected to a servo motor fixedly installed on the outside of the mixing pipe section.

[0012] Furthermore, the second mixing blade is used to forcibly disturb the mixed gas to further break up the methanol droplets, and the spiral blade is used to generate a spiral guide airflow to uniformly guide the mixed gas to the outlet direction of the mixing pipe section.

[0013] Furthermore, the servo motor is an explosion-proof servo motor, which is electrically connected to the engine control unit and is used to adjust the rotation speed of the rotating shaft according to the engine operating conditions.

[0014] Furthermore, one end of the intake pipe section and one end of the mixing pipe section are integrally fixed, welded and fixedly connected, or flanged and fixedly connected.

[0015] Furthermore, one end of the intake pipe section and one end of the mixing pipe section are integrally fixed, welded and fixedly connected, or flanged and fixedly connected.

[0016] The beneficial effects achieved by the present invention using the above structure are as follows: 1. By setting a variable throat in the constriction section of the intake venturi and cooperating with a hydraulically driven movable baffle, the throat opening is dynamically adjusted according to the operating conditions. When the engine is under low load, the intake air flow is small. By introducing hydraulic oil into the hydraulic adjustment chamber, the movable baffle is moved relative to the engine, reducing the effective flow area of ​​the variable throat and increasing the airflow velocity at the throat. This ensures sufficient turbulence intensity to promote the mixing of methanol and air even at low intake air flow. When the engine is under high load, the intake air flow increases. By reducing the hydraulic oil pressure, the movable baffle is reset under the action of the spring, increasing the effective flow area of ​​the variable throat and reducing intake resistance. This ensures sufficient intake volume under high load. By adaptively adjusting the throat opening according to the intake air flow, the intake venturi can provide suitable mixing conditions under different load conditions, overcoming the defect of large fluctuations in mixing effect under varying operating conditions caused by fixed throat structures. This ensures good mixing of methanol and air across the entire operating range.

[0017] 2. By placing the methanol injector at the constriction section of the intake venturi, methanol is ejected in the high-speed airflow in the throat region. The high airflow velocity and strong turbulence in the constriction section of the venturi achieve initial breakage and mixing of methanol. Simultaneously, two adjacent methanol injectors are arranged at an intersection angle of 60° to 120°, and the two high-pressure methanol jets collide spatially in the variable throat region. The shear force generated by the jet collision further breaks the methanol droplets into smaller droplets. Through the superposition of the entrainment effect of the high-speed airflow in the venturi and the secondary breakage effect of the cross collision of the two jets, the atomization fineness and spatial distribution uniformity of methanol are significantly improved. The reduction in droplet size effectively shortens the methanol evaporation time, allowing methanol vapor to mix more fully with air, thus forming a more uniformly concentrated mixture before entering the cylinder, providing a material basis for subsequent complete combustion.

[0018] 3. By installing a first mixing blade driven by a wind turbine blade inside the premixing pipe, the kinetic energy of the intake airflow drives the blade to rotate, performing secondary mixing of methanol and air without the need for external power input. Inside the mixing pipe section, a second mixing blade and a spiral blade driven by a servo motor are installed. The second mixing blade generates forced disturbance to the mixed gas, further breaking and dispersing residual methanol droplets, while the spiral blade generates a spiral guiding airflow to uniformly guide the mixed gas towards the outlet direction. The two-stage mixing structure, combined with the premixing effect of the intake venturi, forms a three-stage progressive mixing path: venturi premixing, passive mixing by the wind turbine, and active mixing by the motor. This greatly extends the effective mixing time and mixing stroke of methanol and air, allowing methanol to fully evaporate and achieve a uniform molecular-level mixing state with air. After the uniform mixed gas enters the large-diameter cylinder, the flame propagation speed is accelerated, the combustion duration is shortened, and combustion is more complete, effectively improving the thermal efficiency of the methanol generator set while reducing the generation of unburned methanol and harmful emissions such as carbon monoxide. Attached Figure Description

[0019] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings: Figure 1 This is a schematic diagram of the intake integrated device structure of a large-bore methanol generator set according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the internal structure of the intake pipe section according to an embodiment of the present invention; Figure 3 This is a schematic diagram of the intake venturi and premixing pipe structure according to an embodiment of the present invention; Figure 4 This is a schematic diagram of the internal structure of the intake venturi in an embodiment of the present invention; Figure 5 This is a schematic diagram of the internal structure of the premixed pipe according to an embodiment of the present invention; Figure 6 This is a schematic diagram of the internal structure of the hybrid pipe section according to an embodiment of the present invention.

[0020] In the diagram, 1. Inlet pipe section; 2. Mixing pipe section; 3. Inlet venturi; 4. Methanol feed pipe; 5. Methanol injector; 6. Variable throat; 7. Premixing pipe; 8. Movable baffle; 9. Hydraulic adjustment chamber; 10. Connecting flow channel; 11. Limiting guide post; 12. Spring; 13. Fixing frame; 14. Wind turbine blade; 15. First rotating rod; 16. First mixing blade; 17. Limiting frame; 18. Rotating shaft; 19. Servo motor; 20. Second mixing blade; 21. Connecting rod; 22. Spiral blade; 23. Hydraulic oil guide pipe. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0023] As described in the background section, there are shortcomings in the existing technology. In order to solve the above-mentioned technical problems, this application proposes an integrated intake device for a large-diameter methanol generator set.

[0024] Example 1: Please see Figures 1 to 6 As shown, an integrated intake device for a large-diameter methanol generator set includes an intake pipe section 1 and a mixing pipe section 2. One end of the intake pipe section 1 is fixedly connected to one end of the mixing pipe section 2, and the other end of the mixing pipe section 2 is connected to the cylinder head of the methanol generator set. The intake pipe section 1 and the mixing pipe section 2 are connected by one of the following methods: integral fixing, welding, or flange fixing. Welding is preferred to facilitate the installation of internal structural components of the intake pipe section 1. The intake pipe section 1 is a cylindrical structure made of stainless steel or aluminum alloy, and its inner wall is polished to reduce airflow resistance. The mixing pipe section 2 is a cylindrical or gradually expanding structure with an inner diameter greater than or equal to the inner diameter of the intake pipe section 1, used to accommodate the mixed methanol-air mixture.

[0025] It also includes an intake venturi 3 located on the left side inside the intake pipe section 1, and a premixing pipe 7 fixedly installed at the right end of the intake venturi 3. The intake venturi 3 is an integral tubular structure consisting of a contraction section, a throat section, and a diffuser section in sequence along the airflow direction. The inner diameter of the contraction section gradually decreases along the airflow direction, the inner diameter of the throat section is the smallest, and the inner diameter of the diffuser section gradually increases along the airflow direction. The premixing pipe 7 is a cylindrical structure, and its inner diameter matches the inner diameter of the diffuser section outlet of the intake venturi 3. One end of the premixing pipe 7 is fixedly connected to the diffuser section outlet of the intake venturi 3 by welding or flange, and the other end of the premixing pipe 7 is connected to the inlet end of the mixing pipe section 2.

[0026] The constricted section of the intake venturi 3 is equipped with several variable throats 6, and each variable throat 6 has an alcohol injector 5 on one side. The variable throats 6 are a series of through-holes evenly distributed circumferentially along the constricted section of the intake venturi 3. The axis of each variable throat 6 forms an acute angle with the axis of the intake venturi 3, used to introduce methanol injected by the alcohol injector 5 into the interior of the intake venturi 3. The alcohol injector 5 is a high-pressure multi-hole alcohol injector with an initiation pressure of 10MPa to 14MPa. The top of the alcohol injector 5 has several nozzles for atomizing methanol into fine droplets.

[0027] A mounting base for fixing the methanol injectors 5 is fixed on the inner surface of the intake pipe section 1. A methanol feed pipe 4 is also fixed on one side of the mounting base. The inlet of the methanol feed pipe 4 extends to the outside of the intake pipe section 1, and the interior of the methanol feed pipe 4 connects to the interior of several methanol injectors 5. The mounting base is an annular or block-shaped structure, fixed to the inner wall of the intake pipe section 1 by welding or bolts. The mounting base has mounting holes that match the shape of the methanol injectors 5. The methanol injectors 5 are installed in the mounting holes by pressure blocks or threaded seals. The methanol feed pipe 4 is an annular or branched pipe structure. One end has an inlet for connecting to an external methanol supply source, and the other end is connected to the inlet of each methanol injector 5 via several branch pipes. Methanol is introduced into the interior of several methanol injectors 5 through the methanol feed pipe 4. An electromagnetic control valve is provided between the methanol feed pipe 4 and the methanol injectors 5 to control the use of the corresponding methanol injectors 5, thereby spraying methanol into the variable throat 6. The electromagnetic control valve is a high-speed switching valve or a proportional solenoid valve, which is electrically connected to the engine control unit (ECU) and is used to independently control the injection timing and injection quantity of each injector 5 according to the engine operating conditions.

[0028] Furthermore, movable baffles 8 are slidably provided on both sides inside the variable throat 6, and hydraulic adjustment chambers 9 are provided on both sides inside the intake venturi 3. One side of the movable baffle 8 is slidably connected to the corresponding hydraulic adjustment chamber 9, and the two hydraulic adjustment chambers 9 are interconnected through a connecting channel 10. The movable baffle 8 is an arc-shaped plate or flat plate structure, and its width matches the width of the variable throat 6. One end of the movable baffle 8 extends into the variable throat 6, and the other end is slidably disposed inside the hydraulic adjustment chamber 9. The hydraulic adjustment chamber 9 is a sealed cavity disposed inside the wall of the intake venturi 3, and its cross-section is rectangular or circular. It is used to contain hydraulic oil and drive the movable baffle 8 to slide. The connecting channel 10 is a channel disposed inside the wall of the intake venturi 3, and its two ends are respectively connected to the two hydraulic adjustment chambers 9 to balance the hydraulic pressure inside the two hydraulic adjustment chambers 9. The constriction section of the intake venturi 3 is also fixedly equipped with several hydraulic oil guide pipes 23, one end of which is connected to the interior of the hydraulic regulating chamber 9. Hydraulic oil is introduced into the hydraulic regulating chamber 9 through the hydraulic oil guide pipes 23 to control the hydraulic pressure inside the chamber and dynamically adjust the positions of the two movable baffles 8 inside the variable throat 6. The hydraulic oil guide pipes 23 are metal pipes or high-pressure hoses, one end of which is sealed to the oil inlet of the hydraulic regulating chamber 9, and the other end extends to the outside of the intake pipe section 1 and connects to the hydraulic supply system.

[0029] Furthermore, two limiting guide posts 11 are fixedly provided on one side of the hydraulic adjustment chamber 9, and one end of each limiting guide post 11 extends into the interior of the movable baffle 8. Two connecting sliding holes that mate with the limiting guide posts 11 are provided on one side of the interior of the movable baffle 8. The limiting guide post 11 is a cylindrical rod, one end of which is fixed to the inner wall of the hydraulic adjustment chamber 9, and the other end is a free end extending into the connecting sliding hole of the movable baffle 8, used to limit the sliding direction and maximum sliding stroke of the movable baffle 8. The connecting sliding hole is a blind hole or through hole located inside the movable baffle 8, and its inner diameter mates with the outer diameter of the limiting guide post 11, ensuring that the movable baffle 8 slides smoothly along the axial direction of the limiting guide post 11. Springs 12 are fitted onto the surface of each of the two limiting guide posts 11, and one end of the spring 12 is fixedly connected to one side of the inner wall of the hydraulic adjustment chamber 9, and the other end of the spring 12 is fixedly connected to one side of the movable baffle 8. Spring 12 is a compression spring or a tension spring, preferably a compression spring. It is sleeved on the outer surface of the limiting guide post 11, with one end abutting against the inner wall of the hydraulic adjustment chamber 9 and the other end abutting against the end face of the movable baffle 8, and is used to provide elastic force to reset the movable baffle 8.

[0030] When spring 12 is in its natural state, one end of spring 12 pulls the movable baffle 8 closer to the inside of the hydraulic regulating chamber 9. At this time, the variable throat 6 is in its maximum opening state. Then, hydraulic oil is introduced into the hydraulic regulating chamber 9 through the hydraulic oil guide pipe 23. The hydraulic oil pushes the two movable baffles 8 to move relative to each other inside the variable throat 6, thereby dynamically adjusting the opening size of the variable throat 6. Specifically, when the hydraulic oil pressure inside the hydraulic regulating chamber 9 increases, the hydraulic oil pushes the movable baffle 8 to slide into the variable throat 6 against the elastic force of spring 12, reducing the effective flow area of ​​the variable throat 6. When the hydraulic oil pressure inside the hydraulic regulating chamber 9 decreases, the movable baffle 8 slides back into the hydraulic regulating chamber 9 under the elastic force of spring 12, increasing the effective flow area of ​​the variable throat 6.

[0031] Specifically, during air intake, to further improve the mixing effect of methanol and intake air, when methanol is sprayed through the methanol injector 5 to one side of the variable throat 6, the two adjacent methanol injectors 5 are controlled to work synchronously, and the included angle between the spray directions of the two adjacent methanol injectors 5 is 60°-120°, preferably 90°, so that the two methanol jets collide in space, achieving secondary breakage of methanol, thereby improving the mixing effect of methanol and intake air. The included angle between the spray directions of the two adjacent methanol injectors 5 refers to the included angle between the spray center axes of the two methanol injectors 5 in space, and this included angle is set by the arrangement angle of the methanol injector 5 mounting base. The two methanol jets collide in the inlet area or inside the variable throat 6, and the shear force generated by the jet collision further breaks the methanol droplets into finer droplets, while promoting the spatial diffusion of methanol in the airflow.

[0032] Example 2: like Figure 3 and Figure 5 , Figure 6As shown, the difference between this embodiment and Embodiment 1 is that, in order to further improve the mixing effect of methanol and intake air, a fixed frame 13 is fixedly provided inside the premixing pipe 7, and a first rotating rod 15 is rotatably provided inside the fixed frame 13. A first mixing blade 16 is fixedly provided on the surface of the first rotating rod 15 for secondary mixing of methanol and intake air inside the intake venturi 3. A fan blade 14 is also fixedly provided at one end of the first rotating rod 15, using the fan blade 14 to convert the intake air blowing force into rotational force, thereby driving the first rotating rod 15 to rotate. The fixed frame 13 is a cross-shaped or star-shaped support structure, and its outer edge is fixed to the inner wall of the premixing pipe 7 by welding or bolts. A bearing mounting hole is provided at the center of the fixed frame 13 for rotatably supporting the first rotating rod 15. The first rotating rod 15 is a cylindrical rod, one end of which is rotatably mounted to the center of the fixed frame 13 via a bearing, and the other end extends into the diffuser section of the intake venturi 3 and is fixedly connected to the fan blade 14. The first mixing blade 16 is an axial flow blade or a helical blade, and several groups of it are distributed along the axial direction of the first rotating rod 15. Each group of blades is evenly arranged circumferentially and is used to turbulentize and mix the airflow during rotation. The impeller blade 14 is an arc-shaped or twisted blade, and it is evenly distributed circumferentially along the end of the first rotating rod 15. The windward surface of the impeller blade 14 faces the outlet direction of the diffuser section of the inlet venturi 3 and is used to receive the impact force of the airflow and convert it into rotational power.

[0033] Furthermore, the mixing pipe section 2 is also equipped with a mixing guide assembly, which is used to mix and guide the methanol and intake air after mixing before sending them into the cylinder head of the methanol generator, thereby ensuring complete combustion. The mixing guide assembly includes a limiting frame 17 fixedly installed at the lower part of the mixing pipe section 2, a rotating shaft 18 rotatably installed inside the limiting frame 17, a second mixing blade 20 fixedly installed on the surface of the rotating shaft 18, a connecting rod 21 fixedly installed at the bottom end of the rotating shaft 18, a spiral blade 22 fixedly installed on the surface of the connecting rod 21, and the top end of the rotating shaft 18 extending to the top of the mixing pipe section 2. A servo motor 19 is also fixedly installed above the mixing pipe section 2, and one end of the output shaft of the servo motor 19 is fixedly connected to the top end of the rotating shaft 18 through a coupling. The limiting frame 17 is a ring or cross-shaped support structure, and its outer edge is fixed to the inner wall of the mixing pipe section 2. A bearing seat is provided at the center of the limiting frame 17 for rotatably supporting the rotating shaft 18. The rotating shaft 18 is a cylindrical rod whose top end passes through the top wall of the mixing pipe section 2 and extends to the outside. A sealed bearing is provided between the rotating shaft 18 and the top wall of the mixing pipe section 2 to prevent leakage of the mixture. The second mixing blade 20 is an axial or radial blade, which is distributed along the axial direction of the rotating shaft 18 and is used to further mix the mixture during rotation. The connecting rod 21 is a cylindrical rod, one end of which is fixedly connected to the bottom end of the rotating shaft 18, and the other end extends along the axial direction of the mixing pipe section 2. The spiral blade 22 is a spiral blade that extends spirally along the surface of the connecting rod 21 and is used to guide and transport the mixture during rotation. The servo motor 19 is an explosion-proof servo motor, which is fixedly installed on the top of the outer wall of the mixing pipe section 2 by a motor bracket. The output shaft of the servo motor 19 is connected to the top end of the rotating shaft 18 through a coupling. The servo motor 19 is electrically connected to the engine control unit (ECU) and is used to adjust the speed of the rotating shaft 18 according to the engine operating conditions.

[0034] Specifically, the bottom end of the mixing pipe section 2 is connected to the cylinder head of the methanol generator set via an intake manifold or directly. When an intake manifold connection is used, the outlet end of the mixing pipe section 2 is fixedly connected to the inlet end of the intake manifold via a flange, and each outlet end of the intake manifold is connected to the cylinder head intake passage of each cylinder of the methanol generator set. When a direct connection is used, the outlet end of the mixing pipe section 2 is directly fixedly connected to the intake port of the cylinder head via a flange, and the mixed gas enters the cylinder head directly through the outlet of the mixing pipe section 2.

[0035] The following combination Figures 1 to 6 The specific working principle of the present invention will be described in detail below: When the methanol generator set is running, pressurized fresh air enters the intake venturi 3 through the inlet end of intake pipe section 1. As the air flows through the constriction section of intake venturi 3, the flow velocity gradually increases, reaching its maximum velocity at the throat section, while the static pressure decreases significantly, forming a negative pressure area. Simultaneously, the engine control unit (ECU) issues commands based on the current operating conditions, controlling the electromagnetic control valve on the methanol feed pipe 4 to open a corresponding number of methanol injectors 5. Under high pressure of 10MPa to 14MPa, methanol is atomized through the multi-hole nozzles of the injectors 5 and injected into the variable throat 6 area. Under the negative pressure in the throat area, the atomized methanol is entrained and initially mixed by the high-speed airflow.

[0036] To further optimize the mixing effect under different operating conditions, hydraulic oil can be introduced into the hydraulic regulating chamber 9 through the hydraulic oil guide pipe 23 to adjust the opening size of the variable throat 6. When the engine is under low load, the intake air flow is small. The hydraulic oil pressure can be increased to push the movable baffle 8 to slide into the variable throat 6, reducing the effective flow area of ​​the throat, thereby increasing the airflow velocity at the throat and ensuring sufficient negative pressure and turbulence intensity to promote the mixing of methanol and air. When the engine is under high load, the intake air flow is large. The hydraulic oil pressure can be reduced to allow the movable baffle 8 to return to its original position under the action of the spring 12, increasing the effective flow area of ​​the throat, thereby reducing intake resistance and ensuring sufficient intake volume.

[0037] The methanol-air mixture, initially mixed by the intake venturi 3, then enters the premixing pipe 7. The mixed airflow drives the impeller blades 14 to rotate, which in turn drives the first rotating rod 15 and the first mixing blade 16 to rotate. The rotation of the first mixing blade 16 disturbs the mixture, further homogenizing the methanol and air.

[0038] The mixture, after secondary mixing in premixing pipe 7, then enters mixing pipe section 2. Servo motor 19, under ECU control, drives rotating shaft 18 to rotate, causing second mixing blade 20 and spiral blade 22 to rotate. The rotation of second mixing blade 20 creates forced disturbance to the mixture, further breaking up residual methanol droplets and dispersing them evenly in the airflow; the rotation of spiral blade 22 generates a spiral guiding airflow, evenly guiding the mixture towards the outlet direction of mixing pipe section 2, and then sending it through the intake manifold or directly into the cylinder head of the methanol generator set. Finally, the uniform methanol-air mixture enters the cylinder for compression and combustion, achieving complete combustion.

[0039] Furthermore, any content not described in detail in this specification is existing technology known to those skilled in the art.

[0040] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0041] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the scope of the invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0042] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. An integrated intake device for a large-diameter methanol generator set, comprising an intake pipe section (1) and a mixing pipe section (2) connected to the intake pipe section (1), characterized in that, The intake pipe section (1) is provided with an intake venturi (3). The constriction section of the intake venturi (3) is provided with a variable throat (6). Movable baffles (8) are slidably provided on both sides of the variable throat (6). The pipe wall of the intake venturi (3) is provided with a hydraulic adjustment chamber (9) that is connected to the movable baffle (8). The hydraulic adjustment chamber (9) is connected with a hydraulic oil guide pipe (23) for introducing hydraulic oil. The variable throat (6) drives the movable baffle (8) to slide relative to each other through the hydraulic adjustment chamber (9) to adjust its opening size, thereby adjusting the throat airflow speed by changing the effective flow area of ​​the throat under different air intake flow conditions.

2. The intake integrated device for a large-diameter methanol generator set according to claim 1, characterized in that, The hydraulic regulating chamber (9) is fixedly provided with a limiting guide post (11). The movable baffle (8) is provided with a connecting sliding hole that slides with the limiting guide post (11). A spring (12) is sleeved on the surface of the limiting guide post (11). One end of the spring (12) is fixedly connected to the inner wall of the hydraulic regulating chamber (9), and the other end of the spring (12) is fixedly connected to the movable baffle (8). The spring (12) is used to drive the movable baffle (8) to reset when the hydraulic oil pressure decreases, so as to increase the opening area of ​​the variable throat (6).

3. The intake integrated device for a large-diameter methanol generator set according to claim 1, characterized in that, The inner wall of the intake pipe section (1) is fixedly provided with a mounting base, and a number of methanol injectors (5) are fixedly provided on the mounting base. The injection direction of each methanol injector (5) is set towards the variable throat (6), and the included angle between the injection directions of two adjacent methanol injectors (5) is 60°-120°, which is used to make the two methanol jets cross and collide in the variable throat (6) area.

4. The intake integrated device for a large-diameter methanol generator set according to claim 3, characterized in that, The intake pipe section (1) is also fixedly provided with a methanol feed pipe (4). The feed port of the methanol feed pipe (4) extends to the outside of the intake pipe section (1). The inside of the methanol feed pipe (4) is connected to the inside of each methanol injector (5). An electromagnetic control valve is provided between the methanol feed pipe (4) and each methanol injector (5). The electromagnetic control valve is used to independently control the injection time and injection quantity of each methanol injector (5) according to the engine operating conditions.

5. The intake integrated device for a large-diameter methanol generator set according to claim 1, characterized in that, The outlet end of the intake venturi (3) is fixedly connected to a premixing pipe (7). A fixing frame (13) is fixedly installed inside the premixing pipe (7). A first rotating rod (15) is rotatably installed on the fixing frame (13). A first mixing blade (16) is fixedly installed on the first rotating rod (15). A wind turbine blade (14) is fixedly installed at one end of the first rotating rod (15). The wind turbine blade (14) is used to convert the kinetic energy of the airflow into rotational power to drive the first mixing blade (16) to rotate, and to perform secondary mixing of methanol and air.

6. The intake integrated device for a large-diameter methanol generator set according to claim 1, characterized in that, The mixing pipe section (2) is provided with a mixing guide assembly inside. The mixing guide assembly includes a limiting frame (17) fixedly installed on the inner wall of the mixing pipe section (2), a rotating shaft (18) rotatably installed in the limiting frame (17), a second mixing blade (20) fixedly installed on the surface of the rotating shaft (18), a connecting rod (21) fixedly connected to the bottom end of the rotating shaft (18), and a spiral blade (22) fixedly installed on the surface of the connecting rod (21). The top end of the rotating shaft (18) extends to the outside of the mixing pipe section (2) and is connected to a servo motor (19) fixedly installed on the outside of the mixing pipe section (2).

7. The intake integrated device for a large-diameter methanol generator set according to claim 6, characterized in that, The second mixing blade (20) is used to forcibly disturb the mixed gas to further break up the methanol droplets, and the spiral blade (22) is used to generate a spiral guide airflow to uniformly guide the mixed gas to the outlet direction of the mixing pipe section (2).

8. The intake integrated device for a large-diameter methanol generator set according to claim 6, characterized in that, The servo motor (19) is electrically connected to the engine control unit and is used to adjust the rotation speed of the rotating shaft (18) according to the engine operating conditions.

9. The intake integrated device for a large-diameter methanol generator set according to claim 1, characterized in that, One end of the intake pipe section (1) and one end of the mixing pipe section (2) are integrally fixed, welded and fixedly connected or flanged and fixedly connected.

10. The intake integrated device for a large-diameter methanol generator set according to claim 1, characterized in that, The outlet end of the mixing pipe section (2) is connected to the cylinder head of each cylinder of the methanol generator set via the intake manifold or directly to the cylinder head of the methanol generator set.

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