Air intake passage structure for a methanol engine

Abstract

The utility model relates to a kind of methanol engine air inlet channel structure, belong to methanol engine field, including first air pipe (1) and second air pipe (2), the first air pipe (1) one end is equipped with air inlet (3), the first air pipe (1) other end and second air pipe (2) one end are connected, the second air pipe (2) other end is equipped with third air pipe (4), the third air pipe (4) end portion is equipped with air outlet (5), first methanol injection hole (6) and second methanol injection hole (7) are equipped on the first air pipe (1). By being provided with first methanol injection hole (6) and second methanol injection hole (7) on the first air pipe (1) of air inlet channel, double injection hole design improves the injection amount of methanol, increases the power of engine.

Description

Technical Field

[0001] This utility model belongs to the field of methanol engines, specifically, it relates to an intake structure for a methanol engine. Background Technology

[0002] Methanol, as a new type of clean energy, is currently widely used in methanol-rich regions such as Xinjiang and Shanxi, and the demand for methanol engines is increasingly strong in oil fields and mining applications. The most crucial structural element of a methanol engine is its intake manifold. Currently, the mainstream methanol engine technology employs an intake manifold combined with port injection. The intake manifold is not only the site of airflow but also the place where methanol is atomized and mixed with fresh air. Therefore, the design of the intake manifold is extremely important, as it affects the engine's intake flow rate, methanol atomization, and mixing uniformity, significantly impacting the engine's power and fuel economy.

[0003] A search revealed that Chinese patent CN107559085A, published on January 9, 2018, discloses an intake duct for a methanol engine, comprising: a first channel, one end of which is connected to the inlet of the intake duct; a second channel, one end of which is connected to the outlet of the intake duct; and a curved channel, the two ends of which are respectively connected to the first channel and the second channel. The curved channel bends around a center point, having a proximal side near the center and a distal side away from the center. On the proximal side, a recess extending along the proximal wall of the curved channel and recessed into the curved channel has a first end near the first channel and a second end near the second channel, the lowest point of the second end being at a horizontal level higher than the first end. On the distal side, a protrusion extending along the distal wall of the curved channel and protruding away from the curved channel is provided. This invention provides a combined flow duct with high vortex and high tumble after the airflow enters the intake duct, resulting in stronger turbulent kinetic energy and higher combustion thermal efficiency, but it cannot increase the methanol injection volume. Utility Model Content

[0004] The present invention aims to provide an intake structure for a methanol engine that improves methanol injection volume.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0006] A methanol engine air intake structure includes a first air intake pipe and a second air intake pipe. One end of the first air intake pipe is provided with an air inlet. The other end of the first air intake pipe is connected to one end of the second air intake pipe. The other end of the second air intake pipe is provided with a third air intake pipe. The end of the third air intake pipe is provided with an air outlet. The first air intake pipe is provided with a first methanol spray hole and a second methanol spray hole.

[0007] The top of the third air intake pipe is provided with a valve guide hole.

[0008] The bottom of the second intake pipe is provided with a water jacket, and a water connector is provided on one side of the water jacket. The bottom of the water jacket is connected to the coolant pipe of the methanol engine.

[0009] The first air intake pipe, the second air intake pipe, and the third air intake pipe are an integral structure.

[0010] The cross-sectional area of ​​the air inlet is S1, and the cross-sectional area of ​​one end of the second air inlet pipe is S2, wherein S2 = 4 / 5S1.

[0011] The cross-sectional area of ​​the other end of the second air intake pipe is S3, where S3 = 4 / 5S1 = S2.

[0012] The cross-sectional area of ​​the air outlet is S4, where S4 = 3 / 5S1.

[0013] The first methanol nozzle and the second methanol nozzle are separated by a height distance of H1 and a horizontal distance of L1.

[0014] The first intake pipe is a curved pipe, the second intake pipe is a straight pipe, and the third intake pipe is a curved pipe. The connection between the second and third intake pipes is arched.

[0015] The technical effects of this utility model are as follows: By setting a first methanol injection hole and a second methanol injection hole on the first intake pipe of the methanol engine intake passage, the dual injection hole design increases the amount of methanol injected and increases the engine power. The cross-sectional area of ​​the internal pipes of the first, second and third intake pipes adopts a variable cross-section design, which improves the methanol atomization ability and the uniformity of the mixed gas. A water jacket is provided at the bottom of the second intake pipe. When the engine is working, the engine coolant enters the water jacket and finally exits from the water connector. The heat of the engine coolant is used to heat the air passage while ensuring the temperature inside the air passage, thus promoting methanol evaporation and atomization. Attached Figure Description

[0016] This manual includes the following figures, which illustrate the following:

[0017] Figure 1 This is a schematic diagram of the intake structure of a methanol engine.

[0018] The markings in the diagram are as follows: 1. First intake pipe; 2. Second intake pipe; 3. Inlet; 4. Third intake pipe; 5. Outlet; 6. First methanol nozzle; 7. Second methanol nozzle; 8. Valve guide hole; 9. Water jacket; 10. Water connector. Detailed Implementation

[0019] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings, in order to help those skilled in the art to have a more complete, accurate and in-depth understanding of the inventive concept and technical solution of this utility model, and to facilitate its implementation.

[0020] like Figure 1 As shown, a methanol engine intake duct structure includes a first intake pipe 1 and a second intake pipe 2. One end of the first intake pipe 1 has an intake port 3, and the other end of the first intake pipe 1 is connected to one end of the second intake pipe 2. The other end of the second intake pipe 2 has a third intake pipe 4, and the end of the third intake pipe 4 has an outlet port 5. The first intake pipe 1 has a first methanol injection hole 6 and a second methanol injection hole 7. By providing the first methanol injection hole 6 and the second methanol injection hole 7 on the first intake pipe 1 of the methanol engine intake duct, the dual-injection-hole design increases the methanol injection volume and thus increases the engine power.

[0021] The third intake pipe 4 has a valve guide hole 8 at its top. The valve guide hole 8 at the top of the third intake pipe 4 is used to install the valve guide and ensure intake and exhaust efficiency.

[0022] The bottom of the second intake pipe 2 is equipped with a water jacket 9, and a water connector 10 is provided on one side of the water jacket 9. The bottom of the water jacket 9 is connected to the coolant pipe of the methanol engine. The water jacket 9 at the bottom of the second intake pipe 2 has a hollow structure to enhance the atomization capability of methanol. When the engine is running, the engine coolant enters the water jacket 9 through the coolant pipe and finally exits from the water connector. The heat of the engine coolant is used to heat the intake structure while maintaining the temperature inside the intake, thus promoting the evaporation and atomization of methanol.

[0023] The first air intake pipe 1, the second air intake pipe 2, and the third air intake pipe 4 are integrated into one unit. This integrated structure provides better sealing.

[0024] The cross-sectional area of ​​the air inlet 3 is S1, and the cross-sectional area of ​​one end of the second air intake pipe 2 is S2, where S2 = 4 / 5S1. The enclosed space between the air inlet 3 and the air outlet 5 forms the air intake duct. The cross-sections of the duct are designed with non-uniform cross-sectional areas, with S1 having the largest area. Within the space between S1 and S2, a sufficiently large volume is required to form a large pressure-stabilizing chamber, enabling rapid response to dynamic changes in engine load and providing more fresh air. At the same time, a sufficiently large space allows for better methanol evaporation, atomization, and mixing, ensuring uniform mixing.

[0025] The cross-sectional area of ​​the other end of the second air intake pipe 2 is S3, where S3 = 4 / 5S1 = S2. The space between S2 and S3 maintains a constant cross-section design to ensure airflow stability and reduce problems such as increased resistance caused by airflow changes.

[0026] The cross-sectional area of ​​the outlet 5 is S4, where S4 = 3 / 5S1. The cross-section between S3 and S4 gradually decreases in size. By reducing the flow area of ​​the air passage, the airflow velocity is increased. The high-speed airflow carries higher kinetic energy into the cylinder, enhancing gas turbulence within the cylinder. The increased turbulent kinetic energy promotes methanol atomization and uniform distribution of the mixture, improving combustion efficiency and reducing circulation fluctuations.

[0027] The first methanol nozzle 6 and the second methanol nozzle 7 are separated by a vertical distance H1 and a horizontal distance L1. The first methanol nozzle 6 and the second methanol nozzle 7 are arranged between sections S1 and S2. Each of the first methanol nozzle 6 and the second methanol nozzle 7 is equipped with a nozzle. The two nozzles are separated by a vertical distance H1 = 30 mm and a horizontal distance L1 = 20 mm. When the engine is running, the two methanol nozzles spray methanol from the two nozzles respectively, increasing the methanol injection rate per unit time. Simultaneously, the two nozzles maintain a certain distance in both the vertical and horizontal directions to prevent interference between the sprayed methanol.

[0028] The first air intake pipe 1 is a curved pipe, the second air intake pipe 2 is a straight pipe, and the third air intake pipe 4 is a curved pipe. The connection between the second air intake pipe 2 and the third air intake pipe 4 is arched. Figure 1 The location is marked at point R. An arched S3 section is provided at the connection between the third intake pipe 4 and the second intake pipe 2. After the airflow reaches this point, it first moves upward with the air passage, and then quickly plunges into the cylinder. When the piston moves upward, the compressed gas forms a strong tumble, which at the same time reduces the vortex and reduces the corrosion and wear of internal parts caused by methanol droplets hitting the wall under the drive of the vortex. The enhanced tumble also improves the uniformity of mixing.

[0029] The working principle of this utility model is as follows: A methanol engine intake manifold structure includes an integrated first intake pipe 1, a second intake pipe 2, and a third intake pipe 4. The first intake pipe 1 is equipped with a first methanol injection hole 6 and a second methanol injection hole 7. This dual-hole design increases the methanol injection volume and thus the engine power. The top of the third intake pipe 4 has a valve guide hole 8 for installing a valve guide, ensuring efficient intake and exhaust. The bottom of the second intake pipe 2 is equipped with a water jacket 9 to enhance methanol atomization. When the engine is running, the engine coolant enters the water jacket 9 through the coolant pipe and exits from the water connector. The heat from the engine coolant heats the intake manifold structure while maintaining the temperature inside the intake manifold, promoting methanol evaporation and atomization. The cross-sectional area of ​​the air inlet 3 is S1, the cross-sectional area of ​​one end of the second air inlet pipe 2 is S2, the cross-sectional area of ​​the other end of the second air inlet pipe 2 is S3, and the cross-sectional area of ​​the air outlet 5 is S4. S2 = 4 / 5S1, S3 = 4 / 5S1 = S2, and S4 = 3 / 5S1. Within the space between S1 and S2, a sufficiently large volume is required to form a large pressure-stabilizing chamber, enabling rapid response to dynamic changes in engine load and providing more fresh air. Simultaneously, a sufficiently large space allows for better methanol evaporation, atomization, and mixing, ensuring uniform mixing. The space between S2 and S3 maintains a constant cross-section design to maintain airflow stability and reduce problems such as increased resistance caused by airflow changes. The cross-section gradually decreases from S3 to S4. By reducing the airflow area, the airflow velocity is increased. The high-speed airflow carries higher kinetic energy into the cylinder, enhancing in-cylinder gas turbulence. Increased turbulent kinetic energy promotes methanol atomization and uniform distribution of the mixture, improving combustion efficiency and reducing cycle fluctuations.

[0030] The present invention has been described above by way of example with reference to the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-described manner. Any non-substantial improvements made using the inventive concept and technical solution of the present invention; or the direct application of the inventive concept and technical solution to other situations without modification, are all within the protection scope of the present invention.

Claims

1. A methanol engine intake manifold structure, characterized in that: It includes a first air inlet pipe (1) and a second air inlet pipe (2). One end of the first air inlet pipe (1) is provided with an air inlet (3). The other end of the first air inlet pipe (1) is connected to one end of the second air inlet pipe (2). The other end of the second air inlet pipe (2) is provided with a third air inlet pipe (4). The end of the third air inlet pipe (4) is provided with an air outlet (5). The first air inlet pipe (1) is provided with a first methanol spray hole (6) and a second methanol spray hole (7).

2. The methanol engine intake manifold structure according to claim 1, characterized in that: The top of the third air intake pipe (4) is provided with a valve guide hole (8).

3. The methanol engine intake manifold structure according to claim 2, characterized in that: The bottom of the second air intake pipe (2) is provided with a water jacket (9), and a water connector (10) is provided on one side of the water jacket (9). The bottom of the water jacket (9) is connected to the coolant pipe of the methanol engine.

4. The methanol engine intake duct structure according to claim 3, characterized in that: The first air intake pipe (1), the second air intake pipe (2) and the third air intake pipe (4) are an integral structure.

5. The methanol engine intake manifold structure according to claim 4, characterized in that: The cross-sectional area of ​​the air inlet (3) is S1, and the cross-sectional area of ​​one end of the second air inlet pipe (2) is S2, wherein S2 = 4 / 5S1.

6. The methanol engine intake manifold structure according to claim 5, characterized in that: The cross-sectional area of ​​the other end of the second air intake pipe (2) is S3, where S3 = 4 / 5S1 = S2.

7. The methanol engine intake manifold structure according to claim 6, characterized in that: The cross-sectional area of ​​the air outlet (5) is S4, where S4 = 3 / 5S1.

8. The methanol engine intake manifold structure according to claim 7, characterized in that: The first methanol nozzle (6) and the second methanol nozzle (7) are H1 apart in the height direction and L1 apart in the horizontal direction.

9. A methanol engine intake manifold structure according to any one of claims 1-8, characterized in that: The first air intake pipe (1) is a curved pipe, the second air intake pipe (2) is a straight pipe, the third air intake pipe (4) is a curved pipe, and the connection between the second air intake pipe (2) and the third air intake pipe (4) is arched.

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