High-strength heat dissipation air cooling cylinder cover suitable for high-pressure common rail oil injection system

Abstract

The invention discloses a high-strength heat dissipation air-cooled cylinder cover suitable for a high-pressure common rail oil injection system. The high-strength heat dissipation air-cooled cylinder cover comprises a cylinder cover body. The cylinder cover body comprises an air inlet channel and an air outlet channel, an expansion section of the air outlet channel expands outwards in the direction away from the air inlet channel, a contraction section of the air outlet channel continues to expand outwards in the direction away from the air inlet channel, and the expansion section is close to the air inlet channel; the air inlet channel adopts straight air inlet and is not spiral, under a high-pressure common-rail oil injection system, combustion disturbance of air inlet to high-pressure oil mist particles sprayed out of a cylinder can be reduced, and the combustion efficiency is improved.

Description

Technical Field

[0001] The invention belongs to the field of heat dissipation air-cooled cylinder heads, and in particular relates to a high-strength heat dissipation air-cooled cylinder head suitable for a high-pressure common rail fuel injection system. Background Art

[0002] The air-cooled cylinder head has a simple structure and can adapt to high and low temperature environments, but its cooling efficiency is also greatly affected by external factors and has certain limitations. The Y-type flow channel fins of the traditional air-cooled cylinder head are vertical flat plates. As the engine power increases, the exhaust duct wall temperature becomes higher and higher, and the corresponding exhaust gas turbocharger requirements will also become higher and higher. Therefore, the heat dissipation capacity of the exhaust duct needs to be further improved, and the turbocharger turbine efficiency also needs to be improved.

[0003] The traditional air-cooled cylinder head intake duct is a spiral intake duct, which improves the intake swirl ratio and increases the intake pressure to a certain extent. However, as the engine power increases, a greater cylinder pressure is required. After using high-pressure common rail injection, the gas with swirl will affect the combustion efficiency. Therefore, based on the high-pressure common rail air-cooled diesel engine, the spiral intake duct of the air-cooled cylinder head needs to be adjusted to reduce the impact on combustion efficiency. Summary of the Invention

[0004] The purpose of the present invention is to provide a high-strength heat dissipation air-cooled cylinder head suitable for a high-pressure common rail injection system, so as to solve the problem that after the high-pressure common rail injection, the gas with vortex affects the combustion efficiency.

[0005] The present invention adopts the following technical solution: a high-strength heat dissipation air-cooled cylinder head suitable for a high-pressure common rail injection system, comprising:

[0006] Cylinder head body; the cylinder head body includes an intake duct and an exhaust duct, and the intake duct and the exhaust duct are respectively located on both sides of the cylinder head body;

[0007] The inlet of the intake duct is located at the top of the cylinder head body, and the outlet of the intake duct is located at the bottom of the cylinder head body. The intake duct is arranged downwardly from top to bottom. The cross-section of the inlet of the intake duct is rectangular, and the cross-section of the outlet is circular. The intake duct is straight, and the cross-sectional area gradually decreases from the inlet to the outlet.

[0008] The inlet of the exhaust duct is located at the bottom of the cylinder head body and is arranged near the outlet of the intake duct, and the outlet of the exhaust duct is located on the left side of the cylinder head body. The exhaust duct is arranged upwardly and tilted from bottom to top. The cross-section of the exhaust duct inlet is circular, and the cross-section of the outlet is rectangular. The cross-sectional area gradually increases from the inlet to the outlet. The exhaust duct is composed of an expansion section, a contraction section, and an expansion section that are connected in sequence from the inlet to the outlet.

[0009] The expansion section of the exhaust duct is arranged to expand outwardly in a direction away from the air inlet duct, the contraction section of the exhaust duct continues to expand outwardly in a direction away from the air inlet duct, and the expansion section is arranged to move closer to the air inlet duct.

[0010] Furthermore, a guide groove is provided on the inner wall of the exhaust duct along its direction, and the guide groove is used to guide the exhaust gas.

[0011] Furthermore, it also includes a "Y"-shaped heat dissipation channel and multiple main heat dissipation fins located in the heat dissipation channel, each main heat dissipation fin is arranged vertically, and one end thereof is close to the top of the cylinder head body, and the other end thereof is arranged close to the bottom of the cylinder head body. Multiple main heat dissipation grooves are opened from left to right on the front side wall and the rear side wall of each main heat dissipation fin, and each main heat dissipation groove is used to increase the heat exchange area between the main heat dissipation fin and the outside world.

[0012] Furthermore, it also includes: multiple auxiliary heat dissipation fins arranged along the air inlet duct and the exhaust duct, each auxiliary heat dissipation fin is arranged horizontally, and multiple auxiliary heat dissipation grooves are opened from left to right along the upper side wall and the lower side wall, and each auxiliary heat dissipation groove is used to increase the heat exchange area between the auxiliary heat dissipation fin and the outside world.

[0013] Furthermore, the cross-sectional area ratio of the inlet to the outlet of the air intake duct is 1.2:1.

[0014] Furthermore, the cross-sectional area ratio of the expansion section to the contraction section is 1.1:1; and the cross-sectional area ratio of the contraction section to the expansion section is 1:1.9.

[0015] Furthermore, it also includes: an air guide cylinder, located at the outlet of the exhaust duct, with multiple air guide grooves on the inner wall of the air guide cylinder, and the multiple air guide grooves are spirally arranged. The air guide grooves are used to change the flow direction of the exhaust gas so that the exhaust gas is discharged in a spiral shape, thereby improving the turbine efficiency.

[0016] Furthermore, the main heat dissipation groove and the auxiliary heat dissipation groove have a depth of ≤0.5 mm, a width of ≤5 mm, and a spacing of ≤2 mm.

[0017] The beneficial effects of the present invention are:

[0018] The air intake duct of the present invention is straight air intake without spiral, which can reduce the combustion disturbance of the high-pressure oil mist particles ejected from the cylinder by the intake air under the high-pressure common rail injection system, thereby improving the combustion efficiency;

[0019] The present invention provides a main heat dissipation groove and a secondary heat dissipation groove, thereby effectively increasing the convection heat exchange area of ​​the heat dissipation flow channel without significantly affecting the overall stress level of the cylinder head body.

[0020] The present invention provides guide grooves to guide the exhaust gas, thereby effectively increasing the convection heat exchange area between the exhaust gas and the exhaust duct without significantly affecting the overall stress level of the cylinder head body, and allowing the exhaust gas to enter the turbine with a tangential velocity, thereby improving the turbine efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 A top view of the present invention;

[0022] Figure 2 A cross-sectional view of one surface of the exhaust duct of the present invention;

[0023] Figure 3 is a cross-sectional view of another surface of the exhaust duct of the present invention;

[0024] Figure 4 A bottom view of the present invention;

[0025] Figure 5 A schematic structural diagram of the air intake duct of the present invention at one angle;

[0026] Figure 6 A schematic structural diagram of the air intake duct of the present invention from another angle;

[0027] Figure 7 A schematic structural diagram of the exhaust duct of the present invention at one angle;

[0028] Figure 8 This is a schematic structural diagram of the exhaust duct of the present invention from another angle.

[0029] Among them: 10, air intake duct; 11, exhaust duct; 12, top; 13, bottom; 14, left side; 15, expansion section; 16, contraction section; 17, expansion section; 23, air guide cylinder; 24, air guide groove. DETAILED DESCRIPTION

[0030] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0031] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more. The "direction" in the present invention is based on the direction of the present invention. Figure 1 Description of the direction of the state.

[0032] The present invention discloses a high-strength heat dissipation air-cooled cylinder head suitable for a high-pressure common rail fuel injection system. Figure 1 and Figure 4 As shown, it includes: a cylinder head body; the cylinder head body includes an intake passage 10 and an exhaust passage 11, and the intake passage 10 and the exhaust passage 11 are respectively located on both sides of the cylinder head body.

[0033] like Figure 5 and 6 As shown, the inlet of the intake duct 10 is located at the top 12 of the cylinder head body, and the outlet of the intake duct 10 is located at the bottom 13 of the cylinder head body. The intake duct 10 is arranged to be inclined downward from top to bottom. The inlet cross-section of the intake duct 10 is rectangular, and the outlet cross-section is circular. The intake duct 10 is a straight strip, and the cross-sectional area gradually decreases from the inlet to the outlet.

[0034] like Figure 2 and 3 As shown, the inlet of the exhaust duct 11 is located at the bottom 13 of the cylinder head body and is close to the outlet of the intake duct 10, and the outlet of the exhaust duct 11 is located on the left side 14 of the cylinder head body. The exhaust duct 11 is arranged upward from bottom to top, and the inlet cross-section of the exhaust duct 11 is circular, and the outlet cross-section is rectangular, and the cross-sectional area gradually increases from the inlet to the outlet. Figure 7 and 8 As shown, the exhaust passage 11 is composed of an expansion section 15, a contraction section 16 and an expansion section 17 which are connected in sequence from the inlet to the outlet.

[0035] The expansion section 15 of the exhaust duct 11 expands outwardly away from the intake duct 10, the contraction section 16 of the exhaust duct 11 continues to expand outwardly away from the intake duct 10, and the expansion section 17 is arranged toward the intake duct 10. The inner wall of the exhaust duct 11 is provided with a guide groove along its direction to guide the exhaust gas.

[0036] The present invention also includes a "Y"-shaped heat dissipation channel and multiple primary heat dissipation fins located within the channel. Each primary heat dissipation fin is vertically arranged, with one end near the top 12 of the cylinder head body and the other near the bottom 13 of the cylinder head body. Multiple primary heat dissipation grooves are defined from left to right on the front and rear sidewalls of each primary heat dissipation fin. Each primary heat dissipation groove serves to increase the heat exchange area between the primary heat dissipation fin and the surrounding environment. The primary and secondary heat dissipation grooves are ≤0.5mm deep, ≤5mm wide, and ≤2mm apart.

[0037] The present invention also includes: multiple auxiliary heat dissipation fins arranged along the air inlet duct 10 and the exhaust duct 11, each auxiliary heat dissipation fin is arranged horizontally, and multiple auxiliary heat dissipation grooves are opened from left to right along the upper side wall and the lower side wall thereof, and each auxiliary heat dissipation groove is used to increase the heat exchange area between the auxiliary heat dissipation fin and the outside world.

[0038] The cross-sectional area ratio of the inlet and outlet of the air inlet 10 is 1.2:1. The cross-sectional area ratio of the expansion section 15 to the contraction section 16 is 1.1:1; and the cross-sectional area ratio of the contraction section 16 to the expansion section 17 is 1:1.9.

[0039] The present invention also includes: an air guide cylinder 23, which is located at the outlet of the exhaust duct 11. A plurality of air guide grooves 24 are provided on the inner wall of the air guide cylinder 23. The plurality of air guide grooves 24 are spirally arranged. The air guide grooves 24 are used to change the flow direction of the exhaust gas so that the exhaust gas is discharged in a spiral shape, thereby improving the turbine efficiency.

[0040] In the prior art, since the intake duct 10 is spirally installed, the relatively high-speed and disordered fresh air flowing through the spiral intake duct 10 and blown into the cylinder will cause large disturbances in the combustion of the fine oil mist particles under the high-pressure common rail, thereby affecting the combustion efficiency. Therefore, the straight intake duct 10 of the present invention has a relatively small Reynolds number, can stably blow into the cylinder, has little disturbance to the combustion of the fine oil mist particles under the high-pressure common rail, and has a higher combustion efficiency.

[0041] The exhaust duct 11 of the present invention includes an expansion section 15, a contraction section 16 and an expansion section 17. When high-temperature exhaust gas flows through the exhaust duct 11, the air guide grooves 24 can effectively increase the heat exchange area between the high-temperature exhaust gas and the wall of the exhaust duct 11. Under the guidance of the air guide grooves 24, the tangential velocity of the exhaust gas will be effectively increased and flow to the supercharger turbine, which can provide the turbine with a certain initial rotational momentum, effectively increase the tangential power of the supercharger turbine, improve the turbine efficiency, and effectively increase the heat exchange between the high-temperature exhaust gas and the wall of the exhaust duct 11; when opening, the air guide grooves 24 preferably have a diameter of 3 mm, and a total of 5 grooves are engraved, and the heat dissipation area is increased by 74% compared with not opening the air guide grooves 24.

[0042] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A high-strength heat dissipation air-cooled cylinder head suitable for high-pressure common rail injection system, characterized in that: The invention comprises a cylinder head body; the cylinder head body comprises an air intake passage (10) and an exhaust passage (11), and the air intake passage (10) and the exhaust passage (11) are respectively located on two sides of the cylinder head body; The air inlet (10) is straight and not spiral, with its inlet located at the top (12) of the cylinder head body and its outlet located at the bottom (13) of the cylinder head body. The air inlet (10) is arranged downwardly and tilted from top to bottom. The inlet cross section of the air inlet (10) is rectangular, and the outlet cross section is circular. The cross-sectional area gradually decreases from the inlet to the outlet, and the cross-sectional area ratio of the inlet to the outlet is 1.2:

1. The inlet of the exhaust duct (11) is located at the bottom (13) of the cylinder head body and is arranged close to the outlet of the intake duct (10), and the outlet is located on the left side (14) of the cylinder head body. The exhaust duct (11) is arranged upwardly and tilted from bottom to top; the inlet cross section of the exhaust duct (11) is circular, and the outlet cross section is rectangular, and the cross-sectional area gradually increases from the inlet to the outlet; The exhaust duct (11) is composed of an expansion section (15), a contraction section (16), and an expansion section (17) that are sequentially connected from the inlet to the outlet, wherein the expansion section (15) expands outwardly in a direction away from the air inlet duct (10), the contraction section (16) continues to expand outwardly in a direction away from the air inlet duct (10), and the expansion section (17) moves closer to the air inlet duct (10); the cross-sectional area ratio of the expansion section (15) to the contraction section (16) is 1.1:1, and the cross-sectional area ratio of the contraction section (16) to the expansion section (17) is 1:1.9; The cross-sectional shape changes of the air inlet duct (10) and the exhaust duct (11) are optimized and determined through a limited number of conventional tests to ensure air flow stability and heat dissipation efficiency.

2. The high-strength heat dissipation air-cooled cylinder head suitable for a high-pressure common rail fuel injection system according to claim 1, characterized in that: A guide groove is provided on the inner wall of the exhaust duct (11) along its direction, and the guide groove is used to guide the exhaust gas to increase the heat exchange area between the exhaust gas and the wall of the exhaust duct (11) and guide the flow direction of the exhaust gas.

3. The high-strength heat dissipation air-cooled cylinder head suitable for a high-pressure common rail fuel injection system according to claim 1, characterized in that: The air intake duct (10) is designed to be straight and non-spiral, which can reduce the combustion disturbance of the high-pressure oil mist particles ejected from the cylinder by the air intake, thereby improving the combustion efficiency.

4. The high-strength heat dissipation air-cooled cylinder head suitable for a high-pressure common rail fuel injection system according to claim 1, characterized in that: The three-section structure (expansion section, contraction section, expansion section) of the exhaust duct (11) can improve exhaust vortex and turbine efficiency by optimizing the expansion and convergence directions of each section.

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