CN215170342U - Cylinder head for direct injection in cylinder - Google Patents
Cylinder head for direct injection in cylinder Download PDFInfo
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- CN215170342U CN215170342U CN202023065082.8U CN202023065082U CN215170342U CN 215170342 U CN215170342 U CN 215170342U CN 202023065082 U CN202023065082 U CN 202023065082U CN 215170342 U CN215170342 U CN 215170342U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
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- Combustion Methods Of Internal-Combustion Engines (AREA)
Abstract
The utility model discloses a cylinder head for direct injection in jar, combustion chamber gas vent offside one end adopt with cylinder body smooth transition's inclined plane molding, follow air current direction curved surface slope change gently, do benefit to fresh air and evenly get into the combustion chamber, reduce the air intake resistance. The slope change of the curved surface of the rest positions of the combustion chamber is large, and the curved surface is close to vertical to the joint of the cylinder body, so that the concentration of the mixed gas at the position is facilitated, and the discharge of the mixed gas from an exhaust port is reduced. The nozzle is positioned at the highest position of the cylinder head combustion chamber, and the injection position is parallel to the axis of the cylinder body, so that the uniform injection of fuel is facilitated, and the collision of fuel spray to the wall is reduced. The spark plug is arranged on one side of the combustion chamber close to the exhaust port of the cylinder body, has an angle of 40-60 degrees with the nozzle and an axial projection distance of 5.5-7mm with the nozzle, and is positioned at the axis position of the cylinder body, and the position has an ideal air-fuel ratio, so that flame ignition and propagation are facilitated.
Description
Technical Field
The utility model relates to a cylinder head for direct injection in cylinder.
Background
The aviation piston engine is used as a power device, gasoline is widely used as a fuel at present, compared with gasoline, aviation heavy oil has the characteristics of large viscosity and high flash point, is safe and reliable to transport and store, is universal for oil in military fields such as aviation and shipboard, and can simplify the guarantee. However, the high viscosity of the heavy oil also brings about the characteristic that the heavy oil has poor fluidity at low temperature, which affects the combustion effect of the fuel and causes difficulty in starting the engine.
At present, the two-stroke heavy oil piston engine mostly uses the design structure of the traditional gasoline engine, although some technologies such as carburetor + auxiliary heating, mechanical injection, electric control injection and the like appear, the technologies adopt a mode that oil gas is premixed and then enters a combustion chamber from a scavenging passage, fuel loss in a scavenging stage cannot be well avoided, and the starting period is mostly long, so that the technical research of direct injection in a cylinder of heavy oil is carried out, particularly, the mounting positions of a spark plug and an oil nozzle and the structure of the combustion chamber are researched pertinently according to the spraying characteristic of the heavy oil, the fluidity of mixed gas is improved, the air-fuel ratio near the spark plug is improved, flame propagation in combustion is accelerated, the fuel loss is reduced, and the two-stroke heavy oil piston engine has important significance for the research of the combustion chamber of the two-stroke heavy oil piston engine.
SUMMERY OF THE UTILITY MODEL
The utility model provides a cylinder head for direct injection in jar contains the heterotypic eccentric combustion chamber structure of integral type to and install spark plug and fuel sprayer relative position on the cylinder head, can effectively improve the combustion efficiency of heavy oil, reduce oil consumption and start the degree of difficulty.
The utility model comprises a cylinder head assembly, a cylinder body assembly and a combustion chamber;
the cylinder head assembly is fixed at the top of the cylinder body assembly; the cylinder head assembly has a recess therein, and when the engine piston is at top dead center, the area formed by the piston and the recess of the cylinder head assembly is a combustion chamber in which fuel is combusted.
The combustion chamber is of an integrated special-shaped eccentric curved surface model, the cavity of the combustion chamber faces downwards, the cross section of the combustion chamber is gradually increased, and the maximum cross section is reached at the joint of the combustion chamber and the cylinder body assembly.
The combustion chamber is divided into four combustion chamber inner walls according to the direction, the four combustion chamber inner walls respectively correspond to four edges of the cylinder head assembly, and the four combustion chamber inner walls are respectively a first combustion chamber inner wall, a second combustion chamber inner wall, a third combustion chamber inner wall and a fourth combustion chamber inner wall;
the cylinder body assembly comprises a first scavenging port, a second scavenging port, a third scavenging port and an exhaust port, wherein 3 scavenging ports and 1 exhaust port respectively correspond to four edges of the cylinder body assembly, the second scavenging port and the exhaust port are arranged in an opposite side mode, and the first scavenging port and the third scavenging port are completely identical and arranged in an opposite side mode;
the inner wall of the first combustion chamber is positioned at the second scavenging port side, the inner wall of the second combustion chamber is positioned at the first scavenging port side, the inner wall of the third combustion chamber is positioned at the exhaust port side, and the inner wall of the fourth combustion chamber is positioned at the third scavenging port side; the four combustion chamber inner walls correspond to the 3 scavenging ports and the 1 exhaust port respectively, so that the air inlet flow can smoothly enter the combustion chamber, and the combustion waste gas can be smoothly discharged.
The whole structure of the combustion chamber deflects to the opposite side of the exhaust port, the eccentric distance is 0.2D-0.3D, and D represents the diameter of the cylinder body assembly.
The maximum section length of the combustion chamber is 0.5D-0.8D.
The inner wall tangent line of the inner wall of the third combustion chamber and the axis of the cylinder body assembly form 40-60 degrees, and air flow can smoothly enter the combustion chamber.
Except the inner wall of the third combustion chamber on the opposite side of the exhaust port, the tangents of the inner walls of the three positions of the inner wall of the first combustion chamber, the inner wall of the second combustion chamber and the inner wall of the fourth combustion chamber form 0-8 degrees with the axis of the cylinder assembly.
The cylinder head assembly is provided with three mounting holes, wherein the mounting hole in the middle is a nozzle mounting hole, and the mounting holes on the left side and the right side of the nozzle mounting hole are respectively a reserved mounting hole and a spark plug mounting hole;
the utility model discloses still include the nozzle, the nozzle passes through the nozzle mounting hole and is connected with the cylinder head to through the nozzle mounting hole with fuel injection to in combustion chamber and the cylinder body assembly.
The spark plug mounting hole is arranged on one side close to the inner wall of the first combustion chamber, the angle between the spark plug mounting hole and the nozzle is 40-60 degrees, and the axial projection distance between the ignition gap of the spark plug and the nozzle is 5.5-7 mm.
The nozzle mounting hole is located at the highest central position of the combustion chamber.
The reserved mounting hole is arranged on the side of the spark plug mounting hole, the angle between the reserved mounting hole and the nozzle is 40-60 degrees, and the axial projection distance between the reserved mounting hole and the nozzle is 3-5 mm.
Has the advantages that: the utility model discloses heterotypic is based on eccentric combustion chamber design, can guarantee the distribution of efficiency and gas mixture of admitting air, more is fit for the burning of heavy oil. The utility model discloses a combustion chamber gas vent offside one end adopts the inclined plane molding with cylinder body smooth transition, and the change of following the air current direction curved surface slope is mild, does benefit to fresh air and evenly gets into the combustion chamber, reduces the resistance of admitting air. The slope change of the curved surface of the rest positions of the combustion chamber is large, and the curved surface is close to vertical to the joint of the cylinder body, so that the concentration of the mixed gas at the position is facilitated, and the discharge of the mixed gas from an exhaust port is reduced. The nozzle is positioned at the highest position of the cylinder head combustion chamber, and the injection position is parallel to the axis of the cylinder body, so that the uniform injection of fuel is facilitated, and the collision of fuel spray to the wall is reduced. The spark plug is arranged on one side of the combustion chamber close to the exhaust port of the cylinder body, has an angle of 40-60 degrees with the nozzle and an axial projection distance of 5.5-7mm with the nozzle, and is positioned at the axis position of the cylinder body, and the position has an ideal air-fuel ratio, so that flame ignition and propagation are facilitated.
Drawings
These and other advantages of the invention will become apparent from the following more detailed description of the invention, when taken in conjunction with the accompanying drawings and detailed description.
Fig. 1 is a sectional view of the cylinder head and the cylinder body of the present invention.
Fig. 2 is another cross-sectional view of the cylinder head and cylinder body of the present invention.
Fig. 3 is a top view of the cylinder head of the present invention.
Detailed Description
The present invention will be further explained with reference to the drawings and the embodiments.
As shown in fig. 1, 2 and 3, the present invention provides a cylinder head for direct injection in a cylinder, which includes a cylinder head assembly 1, a cylinder block assembly 2 and a combustion chamber 3;
the cylinder head assembly 1 is fixed at the top of the cylinder body assembly 2; the cylinder head assembly 1 has a recess therein, and when the engine piston is at top dead center, the area formed by the piston and the recess of the cylinder head assembly is a combustion chamber 3 in which fuel is combusted.
The combustion chamber 3 is an integrated special-shaped eccentric curved surface model, the cavity of the combustion chamber 3 faces downwards, the section of the combustion chamber is gradually increased, and the maximum section is reached at the joint of the combustion chamber 3 and the cylinder body assembly 2.
The combustion chamber 3 is divided into four combustion chamber inner walls according to the direction, and the four combustion chamber inner walls are a first combustion chamber inner wall 301, a second combustion chamber inner wall 302, a third combustion chamber inner wall 303 and a fourth combustion chamber inner wall 304 corresponding to the four sides of the cylinder head assembly;
the cylinder body assembly 2 comprises a first scavenging port 6, a second scavenging port 7, a third scavenging port 8 and an exhaust port 9, wherein 3 scavenging ports and 1 exhaust port respectively correspond to four sides of the cylinder body assembly, the second scavenging port 7 and the exhaust port 9 are arranged in an opposite side manner, and the first scavenging port 6 and the third scavenging port 8 are completely identical and are arranged in an opposite side manner;
the first combustion chamber inner wall 301 is positioned at the side of the exhaust port 9, the second combustion chamber inner wall 302 is positioned at the side of the first scavenging port 6, the third combustion chamber inner wall 303 is positioned at the side of the second scavenging port 7, and the fourth combustion chamber inner wall 304 is positioned at the side of the third scavenging port 8; the four combustion chamber inner walls correspond to the 3 scavenging ports and the 1 exhaust port respectively, so that the air inlet flow can smoothly enter the combustion chamber, and the combustion waste gas can be smoothly discharged.
The whole structure of the combustion chamber 3 deflects to the opposite side of the exhaust port 9, the eccentric distance is 0.2D-0.3D, and D represents the diameter of the cylinder assembly 2.
The maximum section length of the combustion chamber 3 is 0.5D-0.8D.
The tangent line of the inner wall 303 of the third combustion chamber forms 40-60 degrees with the axis of the cylinder body assembly 2, and air flow can smoothly enter the combustion chamber 3.
Except the third combustion chamber inner wall 303 at the opposite side of the exhaust port 9, the tangents of the three inner walls of the rest first combustion chamber inner wall 301, the second combustion chamber inner wall 302 and the fourth combustion chamber inner wall 304 form 0-8 degrees with the axis of the cylinder assembly 2.
The cylinder head assembly 1 is provided with three mounting holes, wherein the mounting hole in the middle is a nozzle mounting hole 10, and the left and right mounting holes of the nozzle mounting hole 10 are respectively a reserved mounting hole 11 and a reserved spark plug mounting hole 12;
the utility model discloses still include nozzle 4, nozzle 4 is connected with the cylinder head through nozzle mounting hole 10 to through the nozzle mounting hole with fuel injection to combustion chamber 3 and cylinder body assembly 2 in.
Spark plug mounting hole 12 arranges in being close to first combustion chamber inner wall 301 one side, and is 40 ~ 60 degrees with nozzle 4 angle, and spark plug ignition gap department is 5.5 ~ 7mm with nozzle 4 axial projection distance.
The nozzle mounting hole 10 is located at the highest central position of the combustion chamber 3.
The reserved mounting hole 11 is mounted on the opposite side of the spark plug mounting hole 12, the angle between the reserved mounting hole 11 and the nozzle 4 is 40-60 degrees, and the axial projection distance between the reserved mounting hole 11 and the nozzle 4 is 3-5 mm.
Examples
As shown in fig. 1, 2 and 3, the present embodiment provides a cylinder head for direct in-cylinder injection, specifically including, 1-a cylinder head assembly, 2-a cylinder block assembly, 3-a combustion chamber, 301-a first combustion chamber inner wall (exhaust port 9 side), 302-a second combustion chamber inner wall (first scavenging port 6 side), 303-a third combustion chamber inner wall (second scavenging port 7 side), 304-a fourth combustion chamber inner wall (third scavenging port 8 side), 4-a nozzle, 5-a spark plug, 6-a first scavenging port, 7-a second scavenging port, 8-a third scavenging port, 9-an exhaust port, 10-a nozzle mounting hole, 11-a reserved mounting hole, and 12-a spark plug mounting hole.
In the embodiment, the cylinder head is a spark-ignition two-stroke heavy oil piston engine cylinder head.
The combustion chamber 3 is in a special eccentric curved surface shape, the cavity of the combustion chamber faces downwards, the section of the combustion chamber is gradually increased, and the maximum section is reached at the joint of the combustion chamber and the cylinder body.
The whole combustion chamber 3 is deviated towards the opposite side of the exhaust port, the deviation distance is 0.2D-0.3D (D represents the diameter of the cylinder body), and the maximum length of the combustion chamber 3 is 0.5D-0.8D.
The tangential direction of the curved surface of the inner wall 303 of the third combustion chamber close to one side of the second scavenging port 7 forms 40-60 degrees with the axis of the cylinder, so that air flow can enter smoothly, the curvature of the curved surface of the three sides of the inner wall 302 of the second combustion chamber, the inner wall 301 of the first combustion chamber and the inner wall 304 of the fourth combustion chamber is greatly changed, and the tangential direction of the curved surface is approximately parallel to the axis of the cylinder.
The nozzle mounting hole is located in the middle of the highest position of the combustion chamber, the spark plug mounting hole is arranged on one side, close to an exhaust port of a cylinder body, of the combustion chamber, the angle between the spark plug mounting hole and the nozzle is 40-60 degrees, the axial projection distance between the ignition gap of the spark plug and the nozzle is 5.5-7mm, the reserved mounting hole is arranged on the side of the spark plug mounting hole, the angle between the reserved mounting hole and the nozzle is 40-60 degrees, the axial projection distance between the reserved mounting hole and the nozzle is 3-5mm, and a temperature sensor can be mounted in the reserved mounting hole and used for monitoring the temperature of a cylinder head, so that faults can be found quickly; the pressure relief valve can be installed, resistance in starting is reduced, and starting is facilitated.
In the air intake process, fresh air enters from the first scavenging port 6, the second scavenging port 7 and the third scavenging port 8 to form airflow, the fresh air enters the combustion chamber from the inner wall 303 side of the third combustion chamber, the curved surface of the inner wall of the combustion chamber is in smooth transition with the cylinder body, the tangential direction of the curved surface forms 40-60 degrees with the axis of the cylinder body, and the airflow entering resistance is small.
The nozzle is arranged at the highest position of the combustion chamber, so that the oil beam can be reduced to the greatest extent and the air and the oil mist can be better mixed.
Fresh air is mixed with fuel spray after entering the combustion chamber, and because the curvature change of the inner walls of the second combustion chamber inner wall 302, the first combustion chamber inner wall 301 and the fourth combustion chamber inner wall 304 is large, the included angle between the tangential direction of the curved surface and the axis of the cylinder body is 0-8 degrees, the curved surface is approximately parallel, the air flow is blocked, and the discharge of mixed gas from an exhaust port is reduced.
The mixed gas subjected to resistance meets the piston moving from bottom to top, so that tumble flow is easily formed in the cylinder, layered distribution of the mixed gas is facilitated, and flame propagation during combustion is facilitated.
Due to the eccentric arrangement of the combustion chamber, the relative position of the spark plug can ensure that the spark plug is positioned on the axis of the cylinder, and the ideal air-fuel ratio near the spark plug can be ensured, thereby being beneficial to the ignition of the spark plug and the combustion of the mixed gas.
The preformed hole can be selected as required to install a temperature sensor or a pressure release valve, so that the resistance during starting can be obviously reduced when the pressure release valve is installed, and the starting difficulty is reduced.
The utility model provides a cylinder head for direct injection in jar, the method and the way of specifically realizing this technical scheme are many, above only the utility model discloses a preferred embodiment should point out, to ordinary skilled person in this technical field, not deviating from the utility model discloses under the prerequisite of principle, can also make a plurality of improvements and moist decorations, these improvements and moist decorations also should be regarded as the utility model discloses a protection scope. All the components not specified in the present embodiment can be realized by the prior art.
Claims (10)
1. A cylinder head for direct in-cylinder injection is characterized by comprising a cylinder head assembly (1), a cylinder body assembly (2) and a combustion chamber (3);
the cylinder head assembly (1) is fixed at the top of the cylinder body assembly (2); a pit is arranged in the cylinder head assembly (1), and when the engine piston is positioned at the top dead center, the area formed by the piston and the pit of the cylinder head assembly is a combustion chamber (3);
the combustion chamber (3) is in an integrated special-shaped eccentric curved surface shape, the cavity of the combustion chamber (3) faces downwards, the cross section of the combustion chamber is gradually increased, and the maximum cross section is reached at the joint of the combustion chamber and the cylinder body assembly (2).
2. The cylinder head for direct in-cylinder injection according to claim 1, characterized in that said combustion chamber (3) is divided into four combustion chamber inner walls, corresponding to the four sides of the cylinder head assembly (1), respectively, a first combustion chamber inner wall (301), a second combustion chamber inner wall (302), a third combustion chamber inner wall (303), and a fourth combustion chamber inner wall (304);
the cylinder body assembly (2) comprises a first scavenging port (6), a second scavenging port (7), a third scavenging port (8) and an exhaust port (9), wherein 3 scavenging ports and 1 exhaust port respectively correspond to four sides of the cylinder body assembly (2), the second scavenging port (7) and the exhaust port (9) are arranged in an opposite side mode, and the first scavenging port (6) and the third scavenging port (8) are completely the same and are arranged in an opposite side mode;
the first combustion chamber inner wall (301) is positioned at the exhaust port (9) side, the second combustion chamber inner wall (302) is positioned at the first scavenging port (6) side, the third combustion chamber inner wall (303) is positioned at the second scavenging port (7) side, and the fourth combustion chamber inner wall (304) is positioned at the third scavenging port (8) side; the four combustion chamber inner walls respectively correspond to 3 scavenging ports and 1 exhaust port.
3. Cylinder head for direct in-cylinder injection according to claim 2, characterized in that the overall structure of the combustion chamber (3) is offset to the opposite side of the exhaust port (9) by an eccentric distance of 0.2D to 0.3D, D representing the diameter of the cylinder block assembly (2).
4. A cylinder head for direct in-cylinder injection according to claim 3, characterized in that the maximum cross-sectional length of the combustion chamber (3) is 0.5D-0.8D.
5. The cylinder head for direct in-cylinder injection according to claim 4, characterized in that the tangent of the inner wall of the third combustion chamber inner wall (303) is 40-60 degrees from the axis of the cylinder block assembly (2) and the air flow can smoothly enter the combustion chamber (3).
6. The cylinder head for direct in-cylinder injection according to claim 5, characterized in that tangents to three inner walls of the first combustion chamber inner wall (301), the second combustion chamber inner wall (302), and the fourth combustion chamber inner wall (304) excluding the third combustion chamber inner wall (303) on the opposite side of the exhaust port (9) are 0 to 8 degrees from the axis of the cylinder block assembly (2).
7. The cylinder head for direct in-cylinder injection according to claim 6, characterized in that the cylinder head assembly (1) has three mounting holes, wherein the mounting hole in the middle is a nozzle mounting hole (10), and the mounting holes on the left and right sides of the nozzle mounting hole (10) are respectively a reserved mounting hole (11) and a spark plug mounting hole (12);
the nozzle (4) is connected to the cylinder head through a nozzle mounting hole (10), and injects fuel into the combustion chamber (3) and the cylinder block assembly (2) through the nozzle mounting hole.
8. The cylinder head for direct in-cylinder injection according to claim 7, characterized in that said spark plug mounting hole (12) is disposed at a side close to the first combustion chamber inner wall (301) at an angle of 40 to 60 degrees to the injector (4), and a projected axial distance from the injector (4) at the spark plug ignition gap is 5.5 to 7 mm.
9. The cylinder head for direct in-cylinder injection according to claim 8, characterized in that the nozzle mounting hole (10) is located at the highest central position of the combustion chamber (3).
10. The cylinder head for direct in-cylinder injection according to claim 9, characterized in that the reserved mounting hole (11) is installed at the opposite side of the spark plug mounting hole (12) at an angle of 40-60 degrees with respect to the injector (4) and at an axial projection distance of 3-5mm from the injector (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023065082.8U CN215170342U (en) | 2020-12-18 | 2020-12-18 | Cylinder head for direct injection in cylinder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023065082.8U CN215170342U (en) | 2020-12-18 | 2020-12-18 | Cylinder head for direct injection in cylinder |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215170342U true CN215170342U (en) | 2021-12-14 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202023065082.8U Active CN215170342U (en) | 2020-12-18 | 2020-12-18 | Cylinder head for direct injection in cylinder |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215170342U (en) |
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2020
- 2020-12-18 CN CN202023065082.8U patent/CN215170342U/en active Active
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20230629 Address after: 211299 3rd Floor, Comprehensive Experimental Building, No.1 Science and Technology Innovation Avenue, Lishui Economic Development Zone, Nanjing, Jiangsu Province Patentee after: Rongtong Aviation Engine Technology Co.,Ltd. Address before: No.2, Huangpu Road, Xuanwu District, Nanjing, Jiangsu Province, 210016 Patentee before: NO.60 INSTITUTE OF THE HEADQUARTERS OF GENERAL STAFF OF PLA |
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| TR01 | Transfer of patent right |