A roll flow and swirl mixed intake port and intake valve structure

Abstract

The application relates to the technical field of engine air intake, in particular to a rolling flow and vortex flow mixed air intake passage and air intake valve structure. The application adopts the following scheme: a rolling flow and vortex flow mixed air intake passage and air intake valve structure, which comprises two V-shaped air intake passages, a combustion chamber, an exhaust passage, a conventional air intake valve and a resistance screen air intake valve; the two air intake passages are arranged on one side of the combustion chamber and communicate with the combustion chamber; the exhaust passage is arranged on the other side of the combustion chamber and communicates with the combustion chamber; the conventional air intake valve is arranged on any air intake passage; and the resistance screen air intake valve is arranged on the other air intake passage. The application provides the rolling flow and vortex flow mixed air intake passage and air intake valve structure, which realizes the mixed flow organization of rolling flow and vortex flow under the condition that the original cylinder cover of the engine is not changed and only the one-side air intake valve is replaced, effectively reduces the cost of re-opening the mold of the cylinder cover, trial production and the development cycle of the whole machine.

Description

Technical Field

[0001] This invention relates to the field of automotive engine intake technology, and more particularly to an intake duct and intake valve structure that combines tumble and vortex flow. Background Technology

[0002] like Figure 13 As shown, conventional automotive engines generally employ a parallel tumble intake manifold structure, where only tumble airflow is generated inside the cylinder, without vortex motion. The macroscopic airflow centered on tumble within the cylinder rapidly decays and dissipates after the piston reaches top dead center of compression. The turbulent energy generated is short-lived and insufficient to support combustion reactions within the 30° range after top dead center of the crankshaft, resulting in a low flame propagation rate in the later stages of combustion and limited combustion efficiency. To address this deficiency, the industry has developed a tumble-vortex composite intake manifold solution. This solution utilizes vortex airflow to extend the duration of in-cylinder turbulence after top dead center of compression, thereby improving the flame propagation speed in the later stages of combustion and optimizing overall engine combustion performance.

[0003] Existing patent CN 117552883 B discloses an engine cylinder head structure. This solution creates a composite airflow field coupled with tumble and vortex within the cylinder by adjusting the overall angle of the intake manifold arrangement, thereby accelerating combustion and reducing exhaust pollutant emissions. However, this technology has significant limitations: firstly, it requires the development of a completely new engine cylinder head structure, significantly increasing mold, mold-making, and prototyping costs; secondly, the overall tilted arrangement of the intake manifold directly increases the lateral dimensions of the cylinder head, hindering the miniaturization and lightweight integration of the engine, thus limiting its application scenarios. Summary of the Invention

[0004] This invention provides an intake duct and intake valve structure that combines tumble and vortex flow. Without altering the original engine cylinder head, only one intake valve is replaced, achieving a mixed flow organization of tumble and vortex flow. This effectively reduces the cost of re-molding and prototyping the cylinder head and shortens the overall engine development cycle.

[0005] To achieve this technical objective, the present invention adopts the following solution: an intake duct and intake valve structure that combines tumble and vortex flow, comprising: two intake ducts arranged in a V-shape, a combustion chamber, an exhaust duct, a conventional intake valve, and a baffle intake valve; Two air intakes are located on one side of the combustion chamber and are connected to the combustion chamber; The exhaust duct is located on the other side of the combustion chamber and is connected to the combustion chamber; Conventional intake valves are installed on any intake duct; The air intake valve of the air choke is located on another air intake.

[0006] Furthermore, the air intake is straight, and the angle between the air intake and the horizontal plane is α, with α ranging from 20° to 40°.

[0007] Furthermore, the two air intakes are symmetrically arranged, and the angle between the streamline of each air intake and the center line of symmetry is β, with β ranging from 10° to 30°.

[0008] Furthermore, a conventional intake valve includes a valve and a valve guide, with the valve guide coaxially fixed on the top surface of the valve.

[0009] Furthermore, the air intake valve of the air choke includes an air valve, an air valve guide, and the air choke body; The valve guide tube is coaxially fixed to the top surface of the valve; The air barrier body is ring-shaped and is located on the upper side of the sealing surface of the air valve.

[0010] Furthermore, the air barrier body is fixed on the top surface of the air valve. The cross-section of the air barrier body is horn-shaped, and the tip of the horn is the highest point of the air barrier body and the largest point of its diameter.

[0011] Furthermore, the gas barrier body is a hollow cylinder, and the gas barrier body is fixed on the upper edge of the sealing surface.

[0012] Furthermore, the gas barrier body is a solid cylinder, fixed on the gas valve, and a gap is left between the bottom surface of the gas barrier body and the upper edge of the sealing surface.

[0013] Furthermore, the gas barrier body is a solid cylinder, and the gas barrier body is fixed on the upper edge of the sealing surface.

[0014] Furthermore, the height of the gas barrier body is H, and the range of H is 2mm~4mm; The maximum diameter of the air barrier body is equal to the diameter of the upper edge of the sealing surface.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: This invention, based on the existing V-shaped symmetrical tumble intake, uses a baffle intake valve on one side of the intake. Relying on the flow obstruction effect during the low lift phase, it creates a differentiated distribution of intake flow rate and airflow velocity between the two intakes, breaking the symmetrical ω-shaped airflow within the cylinder. While ensuring that the tumble ratio is close to that of conventional solutions, the vortex ratio is stably maintained at around 0.6, ensuring the continuous flow of the vortex throughout the entire process. After top dead center, the turbulent kinetic energy within the cylinder remains at a high level, 30% higher than conventional solutions, accelerating the combustion speed in the mid-to-late stages of combustion. At the same time, this invention does not require modification of the original engine cylinder head. With only one intake valve changed, it achieves a mixed flow organization of tumble and vortex, greatly saving production costs and shortening the development cycle. Attached Figure Description

[0016] Figure 1A schematic diagram of an intake duct and intake valve structure that combines tumble and vortex flow, provided for an embodiment of the present invention; Figure 2 A front view of an intake duct and intake valve structure that combines tumble and vortex flow, provided in an embodiment of the present invention; Figure 3 A schematic diagram showing the airflow direction of a V-shaped air intake and a conventional air intake valve; Figure 4 A schematic diagram showing the in-cylinder tumble ratio and swirl ratio of a V-shaped intake manifold and a conventional intake valve; Figure 5 This is a schematic diagram of the air intake door of the air choke screen provided in Embodiment 1 of the present invention; Figure 6 This is a schematic diagram illustrating the working principle of the air intake gate of the air choke screen provided in an embodiment of the present invention; Figure 7 A schematic diagram of the airflow direction of an intake duct and intake valve structure that combines tumble and vortex flow, provided for an embodiment of the present invention; Figure 8 A schematic diagram of the in-cylinder tumble ratio and swirl ratio of an intake duct and intake valve structure that combines tumble and swirl, provided for an embodiment of the present invention; Figure 9 A comparison diagram of turbulent kinetic energy within the cylinder; Figure 10 This is a schematic diagram of the air intake door of the air choke screen provided in Embodiment 2 of the present invention; Figure 11 This is a schematic diagram of the air intake door of the air choke screen provided in Embodiment 3 of the present invention; Figure 12 This is a schematic diagram of the air intake door of the air choke screen provided in Embodiment 4 of the present invention; Figure 13 This is a schematic diagram of a conventional automotive engine's parallel tumble intake structure.

[0017] Explanation of reference numerals in the attached figures: 1. Intake duct; 2. Combustion chamber; 3. Exhaust duct; 4. Conventional intake valve; 5. Intake valve with air choke; 6. Air valve; 7. Air valve guide; 8. Air choke body; 9. Sealing surface. Detailed Implementation

[0018] To fully understand the purpose, features and effects of the present invention, the present invention will be described in detail through the following specific embodiments, but the present invention is not limited thereto.

[0019] Comparative Example

[0020] like Figure 3 As shown, existing technology uses a V-shaped air intake and is equipped with two conventional intake valves 4. These two intake airflows rotate counterclockwise and clockwise respectively, forming a symmetrical ω-shaped airflow. Please refer to... Figure 4Its tumble ratio is relatively high during the intake stroke (360°-540° in the figure) and the early compression stroke (540°-720° in the figure), while the vortex ratio is 0. Therefore, the in-cylinder turbulent kinetic energy is mainly affected by the tumble flow. In the later stage of the compression stroke (after 690°), the tumble ratio drops sharply, and its intensity is very low within 60° after the top dead center of the compression stroke (720°-780°). Figure 9 This is not conducive to the later stages of combustion.

[0021] Example 1

[0022] like Figures 1-9 As shown, this invention discloses an intake duct and intake valve structure that combines tumble and vortex flow, comprising: two V-shaped intake ducts 1, a combustion chamber 2, an exhaust duct 3, a conventional intake valve 4, and a baffle intake valve 5. The two intake ducts 1 are located on one side of the combustion chamber 2 and communicate with it. The exhaust duct 3 is located on the other side of the combustion chamber 2 and communicates with it. The conventional intake valve 4 is located on either intake duct 1. The baffle intake valve 5 is located on the other intake duct 1.

[0023] Please refer to Figure 2 The air intake duct 1 is straight, and the angle between the air intake duct 1 and the horizontal plane is α, where α is 20°. The two air intake ducts 1 are symmetrically arranged, and the angle between the streamline of each air intake duct 1 and the center line of symmetry is β, where β is 10°.

[0024] The conventional intake valve 4 includes a valve 6 and a valve guide 7, with the valve guide 7 coaxially fixed on the top surface of the valve 6.

[0025] The air intake valve 5 is an air choke body 8 added to the conventional air intake valve. Specifically, as shown... Figure 5 As shown, the air intake valve 5 of the air choke includes an air valve 6, an air valve guide 7, and an air choke body 8. The air valve guide 7 is coaxially fixed on the top surface of the air valve 6. The air choke body 8 is annular and is located on the upper side of the sealing surface 9 of the air valve 6.

[0026] In this embodiment, the gas barrier body 8 is fixed to the top surface of the gas valve 6. The cross-section of the gas barrier body 8 is horn-shaped, and the tip of the horn represents the highest point of the gas barrier body 8 and the maximum point of its diameter. The maximum diameter of the gas barrier body 8 is equal to the diameter of the upper edge of the sealing surface 9. In this embodiment, the height H of the gas barrier body 8 is 4mm.

[0027] The intake valve 5 of the air choke works in conjunction with the valve seat, and the principle is as follows: Figure 6As shown. When the valve is closed, the sealing surface 9 of the intake valve 5 of the air choke contactes the valve seat, forming a seal, preventing airflow from entering the intake passage 1 through the intake valve 5. When the valve is open, if the valve lift is less than the height H of the air choke body 8, the air choke body 8 will cooperate with the valve seat to form a partial seal, blocking most of the airflow from entering the intake passage 1. When the valve lift is greater than H, the intake valve 5 of the air choke no longer seals against the valve seat, and airflow begins to enter the intake passage 1. By setting the air choke body 8, the amount of airflow passing through the valve and the intake passage is limited.

[0028] like Figure 7 As shown, when one air intake duct 1 is equipped with a choke screen air intake valve 5 and the other air intake duct 1 is equipped with a conventional air intake valve, the low lift of the choke screen air intake valve 5 creates a differential distribution of air intake volume and flow velocity in the two air intake ducts, making the originally balanced ω-shaped airflow asymmetrical and ultimately forming a certain vortex motion.

[0029] like Figure 8 As shown, the tumble ratio pattern formed in this embodiment is similar to that of the prior art, but the eddy ratio is maintained at around 0.6, which keeps the turbulent kinetic energy in the cylinder at a high level after top dead center (please refer to...). Figure 9 It is 30% more efficient than existing technologies.

[0030] Example 2

[0031] In this embodiment, the gas barrier body 8 is a hollow cylinder, and it is fixed to the upper edge of the sealing surface 9. α is 40°, and β is 30°. The height H of the gas barrier body 8 is 4mm. Everything else is the same as in Embodiment 1.

[0032] Example 3

[0033] The gas barrier body 8 is a solid cylinder, fixed to the air valve 6, with a gap between the bottom surface of the gas barrier body 8 and the upper edge of the sealing surface 9. α is 30°, and β is 20°. The height H of the gas barrier body 8 is 2mm. Everything else is the same as in Example 1.

[0034] Example 4

[0035] The gas barrier body 8 is a solid cylinder, and it is fixed to the upper edge of the sealing surface 9. α is 30°, and β is 20°. The height H of the gas barrier body 8 is 4mm. Everything else is the same as in Example 1.

[0036] Finally, it should be noted that the above-listed embodiments are merely preferred embodiments of the present invention. Of course, those skilled in the art can make modifications and variations to the present invention. If such modifications and variations fall within the scope of the claims of the present invention and their equivalents, they should be considered as being within the protection scope of the present invention.

Claims

1. An intake duct and intake valve structure that combines tumble and vortex flow, characterized in that, include: Two V-shaped air intakes (1), a combustion chamber (2), an exhaust duct (3), a conventional air intake valve (4), and a choke air intake valve (5); The two air intakes (1) are disposed on one side of the combustion chamber (2) and communicate with the combustion chamber (2); The exhaust duct (3) is located on the other side of the combustion chamber (2) and communicates with the combustion chamber (2); The conventional intake valve (4) is installed on any of the intake passages (1); The air intake door (5) of the air barrier is located on another air intake (1).

2. The intake duct and intake valve structure with a mixture of tumble and vortex flow according to claim 1, characterized in that, The air intake (1) is straight, and the angle between the air intake (1) and the horizontal plane is α, where α ranges from 20° to 40°.

3. The intake duct and intake valve structure with a mixture of tumble and vortex flow as described in claim 1 or 2, characterized in that, The two air intakes (1) are arranged symmetrically, and the angle between the streamline of each air intake and the center line of symmetry is β, and the range of β is 10°~30°.

4. The intake duct and intake valve structure with a mixture of tumble and vortex flow according to claim 1, characterized in that, The conventional intake valve (4) includes an air valve (6) and an air valve conduit (7), which is coaxially fixed on the top surface of the air valve (6).

5. The intake duct and intake valve structure with a mixture of tumble and vortex flow according to claim 1, characterized in that, The air intake door (5) of the air barrier includes an air valve (6), an air valve guide (7), and an air barrier body (8). The air valve conduit (7) is coaxially fixed on the top surface of the air valve (6); The air barrier body (8) is annular and is located on the upper side of the sealing surface (9) of the air valve (6).

6. The intake duct and intake valve structure with a mixture of tumble and vortex flow according to claim 5, characterized in that, The air barrier body (8) is fixed on the top surface of the air valve (6). The cross-section of the air barrier body (8) is horn-shaped, and the position of the tip of the horn is the highest position of the height and the largest position of the diameter of the air barrier body (8).

7. The intake duct and intake valve structure with a mixture of tumble and vortex flow according to claim 5, characterized in that, The air barrier body (8) is a hollow cylinder and is fixed on the upper edge of the sealing surface (9).

8. The intake duct and intake valve structure with a mixture of tumble and vortex flow according to claim 5, characterized in that, The gas barrier body (8) is a solid cylinder. The gas barrier body (8) is fixed on the gas valve (6). There is a gap between the bottom surface of the gas barrier body (8) and the upper edge of the sealing surface (9).

9. The intake duct and intake valve structure with a mixture of tumble and vortex flow according to claim 5, characterized in that, The gas barrier body (8) is a solid cylinder and is fixed on the upper edge of the sealing surface (9).

10. An intake duct and intake valve structure with a mixture of tumble and vortex flow according to any one of claims 6-9, characterized in that, The height of the air barrier body (8) is H, and the range of H is 2mm~4mm; The maximum diameter of the air barrier body (8) is equal to the diameter of the upper edge of the sealing surface (9).

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