An intake high swirl cylinder head and a diesel engine

Abstract

The present invention belongs to the technical field of diesel engines, and specifically relates to an intake high-swirl cylinder head and a diesel engine, comprising a cylinder head body formed with an intake flow channel and an outlet flow channel, a flow channel wall extending between the intake inlet and the intake outlet of the intake flow channel, a swirl increasing portion protruding from the flow channel wall, the swirl increasing portion comprising an inducing surface and a collision surface, the inducing surface being an inclined surface directly facing the intake inlet to induce part of the gas to flow toward the first side wall and enter the intake outlet along the first side wall, the collision surface directly facing the gas flow path on the downstream side to collide with the part of the gas and force it to turn to the intake outlet; the present invention utilizes the swirl increasing portion protruding from the flow channel wall to induce part of the gas to flow toward the first side wall and enter the intake outlet along the first side wall, thereby reducing the gas near the second side wall and improving the swirl intensity of the gas, while colliding with another part of the gas to increase the swirl intensity of the gas, so that the gas and oil particles can be fully mixed, thereby improving the power of the diesel engine.

Description

Technical Field

[0001] The invention belongs to the technical field of diesel engines, and in particular relates to an intake high-swirl cylinder head and a diesel engine. Background Art

[0002] The diesel engine releases energy through a working cycle consisting of four strokes: intake, compression, work, and exhaust. It generally includes a cylinder block, a cylinder head, and a crank-connecting rod mechanism. The cylinder head has an intake duct and an outlet duct. The filtered air enters the cylinder block through the intake duct and mixes with the diesel oil particles. The diesel mixture burns and expands violently, generating explosive force, pushing the piston downward to do work. The exhaust gas is discharged through the outlet duct, and a certain degree of swirl is conducive to the mixing of air and oil particles.

[0003] In the prior art, air enters the air inlet of the intake flow channel and flows along the curved flow channel wall to the air inlet outlet. The curved flow channel can cause the air to form a certain swirl, but the degree of swirl is small, resulting in insufficient mixing of air and oil particles, insufficient combustion of oil particles, and lower diesel engine power. Summary of the invention

[0004] The technical problem to be solved by the present invention is: in order to solve the problem in the prior art that after the air enters the air inlet of the intake flow channel, it flows along the wall of the curved flow channel to the air inlet outlet, and the curved flow channel can make the air form a certain swirl, but the swirl degree is small, resulting in insufficient mixing of the air and the oil particles, insufficient combustion of the oil particles, resulting in lower power of the diesel engine, an intake high swirl cylinder head and a diesel engine are now provided.

[0005] The technical solution adopted by the present invention to solve the technical problem is: an intake high swirl flow cylinder head, comprising a cylinder head body formed with an intake flow channel and an outlet flow channel, the upstream end of the intake flow channel along the gas path is an intake inlet, and the downstream end is an intake outlet, a curved flow channel wall is extended between the intake inlet and the intake outlet, the side of the flow channel wall close to the outlet flow channel is a first side wall, and the other side is a second side wall;

[0006] A swirl increasing portion for increasing the swirl intensity of the gas is protruded on the flow channel wall, and the swirl increasing portion includes an inducing surface and a collision surface which are relatively arranged. The inducing surface is an inclined surface facing the air inlet to induce part of the gas to flow in the direction of the first side wall and enter the air inlet outlet along the first side wall, and the collision surface is facing the gas flow path on the downstream side to force the part of the gas to turn to the air inlet outlet after colliding with it, while increasing the swirl intensity.

[0007] Furthermore, the attracting surface is inclined from top to bottom toward the direction of the outlet flow channel.

[0008] Furthermore, an intake valve for opening or closing the intake outlet and an intake valve seat for installing the intake valve are provided inside the cylinder head body, and the rotation increasing portion is formed by extending from the bottom surface of the intake valve seat toward the direction of the intake outlet.

[0009] Furthermore, the side where the rotation increasing portion is fixed to the first side wall is the root of the rotation increasing portion, and the other side is the edge, and the thickness of the rotation increasing portion gradually decreases from the root to the edge.

[0010] Furthermore, the top surface of the upstream side includes an extrusion arc surface protruding downward to squeeze the gas to make it flow toward the air inlet outlet, and a guide inclined surface connected to the extrusion arc surface.

[0011] Furthermore, the bottom surface on the upstream side of the intake air passage is a matching inclined surface for matching with the inducing surface to induce the gas to flow toward the intake outlet at an accelerated speed.

[0012] Furthermore, an outlet valve for opening or closing the outlet flow passage and an outlet valve seat for mounting the outlet valve are arranged inside the cylinder head body, and a flow expansion surface is arranged at the bottom end of the outlet valve seat.

[0013] Furthermore, the diffuser surface is inclined from top to bottom toward the direction of the inlet flow channel.

[0014] Furthermore, the air inlet is a trapezoidal structure formed by expansion.

[0015] A diesel engine comprises the above-mentioned cylinder head.

[0016] The beneficial effects of the present invention are as follows: the present invention utilizes the swirl-increasing portion protruding from the flow channel wall to induce part of the gas to flow toward the first side wall and enter the air inlet outlet along the first side wall, thereby reducing the gas near the second side wall and increasing the swirl intensity of the gas. At the same time, the present invention collides with another part of the gas to force it to turn to the air inlet outlet while increasing the swirl intensity, so that the gas and oil particles can be fully mixed, thereby increasing the power of the diesel engine.

[0017] Other features and advantages of the present application will become apparent from the following detailed description of exemplary embodiments of the present application with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0019] Figure 1 is a bottom view of the present invention;

[0020] Figure 2 yes Figure 1 A partial enlarged view of part B;

[0021] Figure 3 yes Figure 1 Sectional view in the AA direction;

[0022] Figure 4 is a three-dimensional diagram of the present invention;

[0023] In the figure:

[0024] 1. Cylinder head body;

[0025] 2. Intake channel; 201. Intake inlet; 202. Intake outlet; 203. Channel wall; 2031. First side wall; 2032. Second side wall; 2033. Extrusion arc surface; 2034. Guide slope; 2035. Matching slope; 204. Rotation increasing part; 2041. Inducing surface; 2042. Collision surface; 2043. Root; 2044. Edge;

[0026] 3. Outlet air channel; 301. Outlet air inlet; 302. Outlet air outlet;

[0027] 4. Intake valve seat; 401. Intake valve hole;

[0028] 5. Exhaust valve seat; 501. Diffuser surface; 502. Exhaust valve hole. DETAILED DESCRIPTION

[0029] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams that only illustrate the basic structure of the present invention in a schematic manner, and therefore only show the components related to the present invention, and directions and references (e.g., up, down, left, right, etc.) may only be used to help describe the features in the drawings. Therefore, the following specific embodiments are not to be taken in a limiting sense, and the scope of the subject matter claimed is limited only by the attached claims and their equivalents.

[0030] like Figure 1 As shown, an intake high swirl flow cylinder head comprises a cylinder head body 1 formed with an intake flow channel 2 and an outlet flow channel 3, wherein the intake flow channel 2 and the outlet flow channel 3 are both communicated with a combustion chamber in a cylinder body, wherein the upstream end of the intake flow channel 2 along the gas path is an intake inlet 201, and the downstream end is an intake outlet 202, wherein a curved flow channel wall 203 is extended between the intake inlet 201 and the intake outlet 202, wherein the side of the flow channel wall 203 close to the outlet flow channel 3 is a first side wall 2031, and the other side is a second side wall 2032;

[0031] A swirl increasing portion 204 for increasing the swirl intensity of the gas is protruded on the flow channel wall 203. The swirl increasing portion 204 includes an inducing surface 2041 and a collision surface 2042 that are relatively arranged. The inducing surface 2041 is opposite to the air inlet 201 to induce part of the gas to flow toward the first side wall 2031 and enter the air inlet outlet 202 along the first side wall 2031.

[0032] The collision surface 2042 is directly opposite to the gas flow path on the downstream side so as to force the gas to turn to the air inlet outlet 202 after colliding with the gas and increase the swirl intensity; when part of the gas flows along the flow channel wall 203 to the position of the collision surface 2042, the collision surface 2042 intercepts it, and the swirl intensity of the gas will be increased during the collision between the two, and the gas after the collision will be closer to the first side wall 2031 and enter the air inlet outlet 202 along the first side wall 2031.

[0033] After entering the air inlet 201, the gas is divided into two branches. A large amount of gas in one branch flows along the induction surface 2041 toward the first side wall 2031, and enters the cylinder body through the air inlet outlet 202 along the first side wall 2031. The first side wall 2031 is closer to the center line of the cylinder body than the second side wall 2032. On the one hand, more gas can enter the center of the cylinder body to mix with the oil particles, and the mixing effect of the two is better. On the other hand, a large amount of gas enters the air inlet outlet 202 along the first side wall 2031, and a small amount enters the air inlet outlet 202 along the second side wall 2032. This distribution method can increase the swirl intensity; the gas in the other branch moves along the flow channel wall 203 to the end and collides with the collision surface 2042, which can increase the swirl intensity, and will have a return trend after the collision, so as to be closer to the first side wall 2031, and flow to the air inlet outlet 202 along the first side wall 2031, further increasing the swirl intensity, thereby increasing the power of the diesel engine.

[0034] In some examples, such as Figure 2 and Figure 3 As shown, the inducing surface 2041 is inclined from top to bottom toward the direction of the outlet flow channel 3 to induce the gas to incline toward the direction of the first side wall 2031 close to the outlet flow channel 3.

[0035] In some examples, such as Figure 3 As shown, the cylinder head body 1 is internally provided with an intake valve for opening or closing the intake outlet 202 and an intake valve seat 4 for installing the intake valve, the intake valve is raised and lowered in the intake valve hole 401 of the intake valve seat 4, the swirl increasing portion 204 is extended from the bottom surface of the intake valve seat 4 toward the direction of the intake outlet 202, but a channel for gas to pass is left between the intake outlet 202.

[0036] In some examples, such as Figure 2As shown, the side where the swirl increasing portion 204 is fixed to the first side wall 2031 is the root 2043 of the swirl increasing portion 204, and the other side is the edge 2044, and the thickness of the swirl increasing portion 204 gradually decreases from the root 2043 to the edge 2044. On the one hand, the thicker root 2043 can improve the structural strength of the swirl increasing portion 204, and the gas entering from the air inlet 201 has a greater speed after passing through the curved flow channel wall 203. The high-strength swirl increasing portion 204 can withstand the impact of the high-speed gas. On the other hand, part of the gas reaching the inducing surface 2041 can be induced to flow along the flow channel wall 203 to obtain a higher gas flow rate.

[0037] In some examples, such as Figure 3 As shown, the top surface of the upstream side of the inlet flow channel 2 includes an extrusion arc surface 2033 that protrudes downward to squeeze the gas to make it flow toward the inlet outlet 202, and a guide slope 2034 connected to the extrusion arc surface 2033. The extrusion arc surface 2033 squeezes the gas downward to make it flow toward the inlet outlet 202. At the same time, the extrusion arc surface 2033 is convex downward to reduce the flow area of ​​this part, so the gas flow rate increases. The guide slope 2034 gradually tilts downward along the direction of the inlet flow channel 2 to the outlet flow channel 3, and a smooth transition is made between it and the extrusion arc surface 2033 to guide the downward flowing gas.

[0038] In some examples, such as Figure 3 As shown, the bottom surface on the upstream side of the inlet flow channel 2 is a matching slope 2035 for cooperating with the inducing surface 2041 to induce the gas to accelerate to flow toward the inlet outlet 202. The matching slope 2035 gradually slopes downward along the inlet flow channel 2 toward the outlet flow channel 3, and the gas entering from the inlet inlet 201 flows rapidly downward along the matching slope 2035.

[0039] In some examples, such as Figure 3 As shown, the upstream end of the outlet flow channel 3 along the gas path is the outlet inlet 301, and the downstream end is the outlet port 302. The cylinder head body 1 is provided with an outlet valve for opening or closing the outlet port 302 and an outlet valve seat 5 for installing the outlet valve. The outlet valve is lifted and arranged in the outlet valve hole 502 of the outlet valve seat 5. The bottom end of the outlet valve seat 5 is provided with a flow expansion surface 501, which is formed by cutting off a part of the bottom end of the outlet valve seat 5, thereby increasing the capacity of the outlet flow channel 3.

[0040] In some examples, the diffuser surface 501 is inclined from top to bottom toward the direction of the inlet flow channel 2 , which can provide guidance for the gas entering from the gas inlet 301 to make it flow quickly toward the gas outlet 302 .

[0041] In some examples, such as Figure 4As shown, the air inlet 201 is a trapezoidal structure formed by expansion, and the air inlet outlet 202 is a circular structure. The irregular flow channel wall 203 connected between the air inlet 201 with the trapezoidal structure and the air inlet outlet 202 with the circular structure can increase the swirl intensity of the gas, and the cross-sectional area of ​​the air inlet 201 is larger than the cross-sectional area of ​​the air outlet 302. The large-diameter air inlet 201 can increase the intake flow rate, thereby improving the power of the diesel engine.

[0042] In some examples, a diesel engine includes the above-described cylinder head.

[0043] Working principle:

[0044] The gas enters the intake flow channel 2 from the trapezoidal intake inlet 201, and first squeezes the arc surface 2033 to squeeze the gas downward to make it flow toward the intake outlet 202. At the same time, the arc surface 2033 is squeezed downward to reduce the flow area of ​​this part to increase the gas flow rate. Then the gas is divided into two branches, and a large amount of gas in one branch flows along the attracting surface 2041 toward the first side wall 2031 through the cooperation of the inclined surface 2035 and the attracting surface 2041, and enters the cylinder body through the intake outlet 202 along the first side wall 2031. The first side wall 2031 is closer to the center line of the cylinder body than the second side wall 2032. On the one hand, more gas can enter the center of the cylinder body to mix with the oil particles, and the mixing effect of the two is better. On the other hand, A large amount of gas enters the air inlet outlet 202 along the first side wall 2031, and a small amount enters the air inlet outlet 202 along the second side wall 2032. This distribution method can increase the swirl intensity; the gas in the other branch moves along the flow channel wall 203 to the end and collides with the collision surface 2042, which can increase the swirl intensity, and has a tendency to return after the collision, so that it is closer to the first side wall 2031 and flows along the first side wall 2031 to the air inlet outlet 202, further increasing the swirl intensity, and then the gas and oil particles burn in the cylinder body, pushing the piston to do work, and the exhaust gas after combustion is discharged into the outlet flow channel 3. The expansion surface 501 in the outlet flow channel 3 increases the volume of the outlet flow channel 3 while guiding the gas to make it flow quickly to the outlet 302.

[0045] The 1# cylinder head used in the present invention and the 2# cylinder head used in the prior art were tested using different evaluation methods, and the obtained technical parameters are shown in the following table. It can be seen from the data in the table that the average flow and power of the diesel engine using the 1# cylinder head are greatly improved.

[0046]

[0047] The above-mentioned ideal embodiments of the present invention are for inspiration. Through the above-mentioned description, relevant staff can make various changes and modifications without departing from the technical idea of ​​the present invention. The technical scope of the present invention is not limited to the contents of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. An intake high swirl cylinder head, characterized in that: The invention comprises a cylinder head body (1) formed with an intake flow channel (2) and an outlet flow channel (3), wherein the upstream end of the intake flow channel (2) along the gas path is an intake inlet (201), and the downstream end is an intake outlet (202), a curved flow channel wall (203) is extended between the intake inlet (201) and the intake outlet (202), and the side of the flow channel wall (203) close to the outlet flow channel (3) is a first side wall (2031), and the other side is a second side wall (2032); A swirl increasing portion (204) for increasing the swirl intensity of the gas is protruding from the flow channel wall (203), the swirl increasing portion (204) comprising an attracting surface (2041) and a collision surface (2042) arranged opposite to each other, the attracting surface (2041) being an inclined surface facing the air inlet (201) to induce part of the gas to flow in the direction of the first side wall (2031) and enter the air inlet outlet (202) along the first side wall (2031), and the collision surface (2042) facing the gas flow path on the downstream side to collide with the part of the gas to force it to turn to the air inlet outlet (202) while increasing the swirl intensity; The attracting surface (2041) is inclined from top to bottom in the direction of the outlet flow channel (3); An intake valve for opening or closing an intake outlet (202) and an intake valve seat (4) for mounting the intake valve are arranged inside the cylinder head body (1), and the rotation increasing portion (204) is formed by extending from the bottom surface of the intake valve seat (4) in the direction of the intake outlet (202).

2. The high-swirl intake cylinder head according to claim 1, characterized in that: The side where the rotation increasing portion (204) is fixed to the first side wall (2031) is the root (2043) of the rotation increasing portion (204), and the other side is the edge (2044), and the thickness of the rotation increasing portion (204) gradually decreases from the root (2043) to the edge (2044).

3. The high-swirl intake cylinder head according to claim 1, characterized in that: The top surface of the upstream side of the intake flow channel (2) comprises an extrusion camber (2033) protruding downwards to extrude gas to make it flow toward the intake outlet (202), and a guide inclined surface (2034) connected to the extrusion camber (2033).

4. The high-swirl intake cylinder head according to claim 1, characterized in that: The bottom surface on the upstream side of the intake air passage (2) is a matching inclined surface (2035) used to cooperate with the inducing surface (2041) to induce the gas to flow faster toward the intake outlet (202).

5. The high-swirl intake cylinder head according to claim 1, characterized in that: An outlet valve for opening or closing an outlet flow passage (3) and an outlet valve seat (5) for mounting the outlet valve are arranged inside the cylinder head body (1), and a flow diffusion surface (501) is arranged at the bottom end of the outlet valve seat (5).

6. The high-swirl intake cylinder head according to claim 5, characterized in that: The diffuser surface (501) is inclined from top to bottom in the direction of the inlet flow channel (2).

7. The high-swirl intake cylinder head according to claim 1, characterized in that: The air inlet (201) is a trapezoidal structure formed by expansion.

8. A diesel engine, characterized in that: It comprises an intake high-swirl cylinder head as described in any one of claims 1 to 7.

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