Air inlet channel structure and engine assembly

Abstract

The invention relates to the technical field of engines, and provides an air inlet duct structure and an engine assembly, the air inlet duct structure is arranged in a cylinder cover, and the air inlet duct structure comprises a main air inlet duct, a tangential air inlet duct and a spiral air inlet duct. Wherein one end of the main air inlet channel is a main air inlet, and the sectional area of the main air inlet is S1; one end of the tangential air inlet channel communicates with the other end of the main air inlet channel, the other end of the tangential air inlet channel communicates with the first valve seat ring, and the sectional area of an outlet at the communicating position is S2; one end of the spiral air inlet channel is communicated with the other end of the main air inlet channel, the other end of the spiral air inlet channel is communicated with the second valve seat ring, the sectional area of an outlet at the communication position is S3, S2 + S3 = S2 + 3, and S1 / S2 + 3 is larger than or equal to 0.95 and smaller than or equal to 1.1. Gas enters the air cylinder from the tangential air inlet channel and the spiral air inlet channel to participate in combustion in the air cylinder, and energy loss caused by the roughness and the shape of the wall face of the air channel can be made up.

Description

Technical Field

[0001] The present invention relates to the technical field of engines, and in particular to an air intake duct structure and an engine assembly. Background Art

[0002] At present, the following problems exist in the design of intake ducts: in order to obtain a higher swirl ratio, the intake duct mostly adopts the traditional diamond valve arrangement. At the same time, the intake duct adopts the structure of long-end tangential intake duct and short-end spiral intake duct. The tangential intake duct is longer, and the offset during the cylinder head casting process is increased. The air duct scheme has high casting sensitivity, resulting in large deviations in the swirl ratio of the air ducts of each cylinder in the finished cylinder head, which has an adverse effect on performance and emissions.

[0003] Therefore, there is an urgent need for an air intake structure and an engine assembly to solve the above technical problems. Summary of the Invention

[0004] The purpose of the present invention is to provide an intake duct structure and an engine assembly that can compensate for energy loss caused by the roughness and shape of the duct wall.

[0005] To achieve this object, the present invention adopts the following technical solutions:

[0006] The intake duct structure is provided in the cylinder head and includes:

[0007] A main air inlet duct, one end of which is a main air inlet port, and a cross-sectional area of ​​the main air inlet port is S1;

[0008] a tangential inlet duct, one end of the tangential inlet duct being connected to the other end of the main inlet duct, the other end of the tangential inlet duct being connected to the first valve seat ring, and a tangential outlet being formed at the connection point, wherein the cross-sectional area of ​​the tangential outlet is S2;

[0009] The spiral inlet duct has one end connected to the other end of the main inlet duct, and the other end of the spiral inlet duct is connected to the second valve seat ring and a spiral outlet is formed at the connection point. The cross-sectional area of ​​the spiral outlet is S3, satisfying S2+S3=S 2+3 , 0.95≤S1 / S 2+3 ≤1.1.

[0010] As a preferred technical solution for the above-mentioned intake duct structure, the center line L1 of the multi-cylinder engine and the line connecting the center point of the above-mentioned tangential intake duct and the center point of the above-mentioned spiral intake duct are L2, satisfying that L1 and L2 are parallel.

[0011] As a preferred technical solution of the above-mentioned intake duct structure, the line connecting the center point of the above-mentioned tangential intake duct and the center point of the above-mentioned spiral intake duct is L2. The above-mentioned main intake duct, the above-mentioned tangential intake duct and the above-mentioned spiral intake duct intersect at a first intersection point. The distance between the above-mentioned first intersection point and the straight line L2 is D1, satisfying 0.6≤D1 / φ2≤0.85, where φ2 is the diameter of the outlet at the connection point between the other end of the above-mentioned tangential intake duct and the above-mentioned first valve seat ring;

[0012] The contour line of the above-mentioned tangential air intake duct adjacent to the center line of the above-mentioned cylinder is a tangential contour line, the contour line of the above-mentioned spiral air intake duct adjacent to the center line of the above-mentioned cylinder is a spiral contour line, the distance between the intersection of the above-mentioned tangential contour line and the above-mentioned spiral contour line and the left end face of the above-mentioned main air intake duct is D2, and the width of the above-mentioned main air intake port is D3, satisfying 45%≤D2 / D3≤50%.

[0013] As a preferred technical solution for the above-mentioned air inlet duct structure, the incident angle between the above-mentioned spiral contour line and L2 is β, which satisfies 76°≤β≤88°, and the width D4 of the above-mentioned spiral air inlet duct satisfies 7mm≤D4≤12mm.

[0014] As a preferred technical solution for the above-mentioned intake duct structure, the included angle between the top surface of the above-mentioned spiral intake duct and the bottom wall of the cylinder head is β2, which satisfies 5°≤β2≤12°.

[0015] As an optimal technical solution for the above-mentioned intake duct structure, the spiral descending surface of the above-mentioned spiral intake duct descends within a range of a dimension D8 in the height direction, 0.65≤D8 / φ3≤85°, and φ3 is the diameter of the outlet at the point where the other end of the above-mentioned spiral intake duct is connected to the above-mentioned second valve seat ring.

[0016] As a preferred technical solution for the above-mentioned intake duct structure, the angle α between the trajectory of the gas entering the above-mentioned cylinder from the above-mentioned tangential intake duct and L2 satisfies 58°≤α≤75°.

[0017] As a preferred technical solution for the above-mentioned intake duct structure, the included angle between the contour of the bottom of the above-mentioned tangential intake duct and the bottom wall of the above-mentioned cylinder head is α1, which satisfies 50°≤α1≤63°.

[0018] As a preferred technical solution of the above-mentioned intake duct structure, a first connecting member is provided at the connection between the above-mentioned tangential intake duct and the above-mentioned first valve seat ring. The above-mentioned first connecting member includes a first connecting portion A and a first connecting portion B that are fixedly connected. The above-mentioned first connecting portion A is a cylinder for fixing with the above-mentioned first valve seat ring. The diameter of the above-mentioned first connecting portion A is φ2 and the height is D6, satisfying 0.09≤φ2 2 / φ1 2≤0.1,0≤D6≤5mm, φ1 is the diameter of the cylinder head, the first connection portion B is a cone for connecting to the tangential intake duct, the angle of the first connection portion B is α2, satisfying 80°≤α2≤110°, and the fillet is R1, satisfying 5mm≤R1≤10mm;

[0019] The connection between the spiral inlet duct and the second valve seat ring is provided with a second connecting piece, which is cylindrical and used to connect with the tangential inlet duct. The diameter of the second connecting piece is φ3, the height is D7, the fillet is R2, and the condition is 0.09≤φ3. 2 / φ1 2 ≤0.1, 5mm≤D7≤16mm, 5mm≤R2≤10mm.

[0020] An engine assembly is also provided, comprising the above-mentioned intake duct structure.

[0021] Beneficial effects of the present invention:

[0022] The present invention provides an intake duct structure and an engine assembly. The intake duct structure is arranged in a cylinder head and includes a main intake duct, a tangential intake duct, and a spiral intake duct. One end of the main intake duct is a main intake port, and the cross-sectional area of ​​the main intake port is S1. One end of the tangential intake duct is connected to the other end of the main intake duct, and the other end of the tangential intake duct is connected to the first valve seat ring, and a tangential outlet is formed at the connection point, and the cross-sectional area of ​​the tangential outlet is S2. One end of the spiral intake duct is connected to the other end of the main intake duct, and the other end of the spiral intake duct is connected to the second valve seat ring, and a spiral outlet is formed at the connection point, and the cross-sectional area of ​​the spiral outlet is S3, satisfying S2+S3=S 2+3 , 0.95≤S1 / S 2+3 ≤1.1.

[0023] For example, with a spiral intake duct, airflow can follow a spiral path into the intake duct, forming a spiral flow. This strong rotational flow can enhance fuel-air mixing efficiency and improve combustion stability. With a tangential intake duct, airflow enters the annular or cylindrical space at a tangential direction, forming a circumferential flow. Tangential intake ducts are easily integrated into an annular cavity, saving space and guiding airflow along the wall for cooling or localized mixing enhancement. Gas enters the cylinder from both the tangential and spiral intake ducts and participates in in-cylinder combustion, compensating for energy losses caused by the roughness and shape of the duct walls. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in describing the embodiments of the present invention. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the contents of the embodiments of the present invention and these drawings without any creative work.

[0025] Figure 1 is a structural schematic diagram of an air intake duct structure provided by an embodiment of the present invention;

[0026] Figure 2 yes Figure 1 Schematic diagram of the perspective A in the middle;

[0027] Figure 3 yes Figure 1 Schematic diagram of the middle B perspective;

[0028] Figure 4 yes Figure 1 Schematic diagram of the middle C perspective;

[0029] Figure 5 yes Figure 4 Schematic diagram of the medium-D perspective;

[0030] Figure 6 yes Figure 3 Schematic diagram of the middle E perspective.

[0031] In the picture:

[0032] 1. Intake duct structure; 2. Cylinder head bottom wall;

[0033] 10. Main air intake duct; 11. Main air inlet; 12. First intersection point;

[0034] 20. Tangential inlet; 21. Tangential outlet; 22. Tangential contour line;

[0035] 30. Spiral air inlet; 31. Spiral outlet; 32. Spiral outline; 33. Top surface of spiral air inlet; 34. Spiral descending surface; 35. Back surface of spiral air inlet. DETAILED DESCRIPTION

[0036] The present invention will be further described in detail below with reference to the accompanying drawings and examples. It will be understood that the specific embodiments described herein are intended only to illustrate the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, not all structures.

[0037] In the description of the present invention, unless otherwise expressly specified or limited, the terms "connected," "connected," and "fixed" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention in specific circumstances.

[0038] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Furthermore, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0039] In the description of this embodiment, the terms "upper," "lower," "right," and other orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely for ease of description and simplified operation. They do not indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meanings.

[0040] like Figures 1 to 6 As shown, the present invention provides an intake duct structure 1, which is arranged in a cylinder head. The intake duct structure 1 includes a main intake duct 10, a tangential intake duct 20, and a spiral intake duct 30. Among them, one end of the main intake duct 10 is a main intake port 11, and the cross-sectional area of ​​the main intake port 11 is S1; one end of the tangential intake duct 20 is connected to the other end of the main intake duct 10, and the other end of the tangential intake duct 20 is connected to the first valve seat ring, and a tangential outlet 21 is formed at the connection point, and the cross-sectional area of ​​the tangential outlet 21 is S2; one end of the spiral intake duct 30 is connected to the other end of the main intake duct 10, and the other end of the spiral intake duct 30 is connected to the second valve seat ring, and a spiral outlet 31 is formed at the connection point, and the cross-sectional area of ​​the spiral outlet 31 is S3, satisfying S2+S3=S 2+3 , 0.95≤S1 / S 2+3 ≤1.1.

[0041] For example, with the spiral intake duct 30, airflow enters the duct along a spiral path, forming a spiral flow. This strong rotational flow enhances fuel-air mixing efficiency and improves combustion stability. With the tangential intake duct 20, airflow enters the annular or cylindrical space tangentially, forming a circumferential flow. The tangential intake duct 20 is easily integrated into the annular cavity, saving space and guiding airflow along the wall for cooling or localized mixing enhancement. Gas enters the cylinder through the tangential and spiral intake ducts 20 and 30, participating in in-cylinder combustion, compensating for energy losses caused by the roughness and shape of the duct walls.

[0042] Optionally, the center line L1 of the multi-cylinder engine and the line connecting the center point of the tangential intake duct 20 and the center point of the spiral intake duct 30 are L2, and L1 and L2 are parallel.

[0043] Optionally, the line connecting the center point of the tangential intake duct 20 and the center point of the spiral intake duct 30 is L2, and the main intake duct 10, the tangential intake duct 20 and the spiral intake duct 30 intersect at the first intersection 12. The distance between the first intersection 12 and the straight line L2 is D1, satisfying that 0.6≤D1 / φ2≤0.85, φ2 is the diameter of the outlet at the point where the other end of the tangential intake duct 20 is connected to the first valve seat ring; the contour line of the tangential intake duct 20 adjacent to the center line of the cylinder is the tangential contour line 22, and the contour line of the spiral intake duct 30 adjacent to the center line of the cylinder is the spiral contour line 32. The distance between the intersection of the tangential contour line 22 and the spiral contour line 32 and the left end face of the main intake duct 10 is D2, and the width of the main intake port 11 is D3, satisfying that 45%≤D2 / D3≤50%. Such an arrangement can provide more air intake for the spiral air intake duct 30 while ensuring the air intake for the tangential air intake duct 20 .

[0044] Optionally, the incident angle between the spiral contour line 32 and L2 is β, which satisfies 76°≤β≤88°, and the width D4 of the spiral air inlet 30 satisfies 7mm≤D4≤12mm.

[0045] Optionally, the included angle between the top surface 33 of the spiral air inlet duct 30 and the cylinder head bottom wall 2 is β2, which satisfies 5°≤β2≤12°, so as to ensure the volume of the spiral cavity of the spiral air inlet duct 30.

[0046] Optionally, the included angle between the back surface 35 of the spiral intake passage 30 and the cylinder head bottom wall 2 is β1, which satisfies 68°≤β1≤86°.

[0047] Optionally, the spiral descending surface 34 of the spiral inlet duct 30 descends within a height dimension D8, where 0.65 ≤ D8 / φ3 ≤ 85°, where φ3 is the diameter of the outlet at the point where the other end of the spiral inlet duct 30 connects to the second valve seat. This allows for a strong vortex flow to form in the spiral inlet duct 30 while ensuring sufficient intake air flow.

[0048] Optionally, the angle α between the trajectory of the gas entering the cylinder from the tangential intake duct 20 and L2 satisfies 58°≤α≤75°. In this way, the gas entering the cylinder from the spiral intake duct 30 can be well pushed.

[0049] Optionally, the included angle α1 between the bottom contour of the tangential intake duct 20 and the cylinder head bottom wall 2 satisfies 50°≤α1≤63°. This reduces intake flow losses in the tangential intake duct 20 and achieves efficient flow, thereby forming a vortex with a relatively central vortex center along the cylinder wall.

[0050] Optionally, a first connecting member is provided at the connection between the tangential inlet duct 20 and the first valve seat ring. The first connecting member includes a first connecting portion A and a first connecting portion B that are fixedly connected. The first connecting portion A is a cylinder for fixing to the first valve seat ring. The diameter of the first connecting portion A is φ2 and the height is D6, satisfying 0.09≤φ2 2 / φ1 2 ≤0.1,0≤D6≤5mm, φ1 is the diameter of the cylinder head, the first connecting part B is a cone, used to connect with the tangential intake duct 20, the angle of the first connecting part B is α2, satisfying 80°≤α2≤110°, the fillet is R1, satisfying 5mm≤R1≤10mm; a second connecting piece is provided at the connection between the spiral intake duct 30 and the second valve seat ring, the second connecting piece is cylindrical, used to connect with the tangential intake duct 20, the diameter of the second connecting piece is φ3, the height is D7, the fillet is R2, satisfying 0.09≤φ3 2 / φ1 2 ≤0.1, 5mm≤D7≤16mm, 5mm≤R2≤10mm. In this way, the position and filling amount of gas flowing into the cylinder can be guaranteed to be consistent. An engine assembly is also provided, including an intake duct structure 1.

[0051] Furthermore, the above are only preferred embodiments of the present invention and the technical principles employed. Those skilled in the art will appreciate that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments, and substitutions are possible for those skilled in the art without departing from the scope of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments and may include many other equivalent embodiments without departing from the scope of the present invention. The scope of the present invention is determined by the scope of the appended claims.

Claims

1. The intake duct structure is arranged in the cylinder head and is characterized in that: The air intake structure includes: A main air inlet duct (10), one end of the main air inlet duct (10) being a main air inlet port (11), and a cross-sectional area of ​​the main air inlet port (11) being S1; a tangential air inlet duct (20), one end of the tangential air inlet duct (20) being connected to the other end of the main air inlet duct (10), the other end of the tangential air inlet duct (20) being connected to the first valve seat ring, and a tangential outlet (21) being formed at the connection point, wherein the cross-sectional area of ​​the tangential outlet (21) is S2; A spiral air intake passage (30), one end of which is connected to the other end of the main air intake passage (10), and the other end of which is connected to the second valve seat ring, and a spiral outlet (31) is formed at the connection point, and the cross-sectional area of ​​the spiral outlet (31) is S3, satisfying S2+S3=S 2+3 , 0.95≤S1 / S 2+3 ≤1.

1.

2. The air intake duct structure according to claim 1, characterized in that: The center line L1 of the multi-cylinder engine and the line connecting the center point of the tangential intake duct (20) and the center point of the spiral intake duct (30) are L2, satisfying that L1 and L2 are parallel.

3. The air intake duct structure according to claim 1, characterized in that: The line connecting the center point of the tangential inlet duct (20) and the center point of the spiral inlet duct (30) is L2, and the main inlet duct (10), the tangential inlet duct (20) and the spiral inlet duct (30) intersect at a first intersection point (12). The distance between the first intersection point (12) and the straight line L2 is D1, satisfying 0.6≤D1 / φ2≤0.85, where φ2 is the diameter of the outlet at the other end of the tangential inlet duct (20) connecting to the first valve seat ring; The contour line of the tangential air inlet (20) adjacent to the center line of the cylinder is a tangential contour line (22), the contour line of the spiral air inlet (30) adjacent to the center line of the cylinder is a spiral contour line (32), the distance between the intersection of the tangential contour line (22) and the spiral contour line (32) and the left end face of the main air inlet (10) is D2, and the width of the main air inlet (11) is D3, satisfying 45%≤D2 / D3≤50%.

4. The air intake duct structure according to claim 3, characterized in that: The incident angle β between the spiral contour line (32) and L2 satisfies 76°≤β≤88°, and the width D4 of the spiral air inlet (30) satisfies 7mm≤D4≤12mm.

5. The air intake duct structure according to claim 1, characterized in that: The included angle between the top surface (33) of the spiral intake passage (30) and the cylinder head bottom wall (2) is β2, which satisfies 5°≤β2≤12°.

6. The air intake duct structure according to claim 1, characterized in that: The spiral descending surface (34) of the spiral air inlet channel (30) descends within a range of a dimension D8 in the height direction, 0.65≤D8 / φ3≤85°, and φ3 is the diameter of the outlet at the connection point between the other end of the spiral air inlet channel (30) and the second valve seat ring.

7. The air intake duct structure according to claim 1, characterized in that: The included angle α between the trajectory of the gas entering the cylinder from the tangential inlet passage (20) and L2 satisfies 58°≤α≤75°.

8. The air intake duct structure according to claim 1, characterized in that: The included angle between the contour of the bottom of the tangential air inlet (20) and the cylinder head bottom wall (2) is α1, which satisfies the following: 50°≤α1≤63°.

9. The air intake duct structure according to any one of claims 1 to 8, characterized in that: A first connecting piece is provided at the connection between the tangential air inlet (20) and the first valve seat ring. The first connecting piece includes a first connecting portion A and a first connecting portion B that are fixedly connected. The first connecting portion A is a cylinder and is used to be fixed to the first valve seat ring. The diameter of the first connecting portion A is φ2 and the height is D6, satisfying 0.09≤φ2 2 / φ1 2 ≤0.1,0≤D6≤5mm, φ1 is the diameter of the end cover, the first connecting portion B is a cone, used to connect with the tangential air inlet (20), the angle of the first connecting portion B is α2, satisfying 80°≤α2≤110°, and the rounded angle is R1, satisfying 5mm≤R1≤10mm; A second connecting piece is provided at the connection between the spiral air inlet (30) and the second valve seat ring. The second connecting piece is cylindrical and is used to connect with the tangential air inlet (20). The diameter of the second connecting piece is φ3, the height is D7, the fillet is R2, and the condition is 0.09≤φ3 2 / φ1 2 ≤0.1, 5mm≤D7≤16mm, 5mm≤R2≤10mm.

10. The engine assembly is characterized in that: The invention comprises the air intake duct structure (1) according to any one of claims 1 to 9.

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