CN220646070U - Direct injection ignition system and heavy methanol engine - Google Patents
Direct injection ignition system and heavy methanol engine Download PDFInfo
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- CN220646070U CN220646070U CN202322465650.0U CN202322465650U CN220646070U CN 220646070 U CN220646070 U CN 220646070U CN 202322465650 U CN202322465650 U CN 202322465650U CN 220646070 U CN220646070 U CN 220646070U
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- cylinder cover
- direct injection
- ignition system
- injection ignition
- methanol
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- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 title claims abstract description 207
- 238000002347 injection Methods 0.000 title claims abstract description 37
- 239000007924 injection Substances 0.000 title claims abstract description 37
- 238000002485 combustion reaction Methods 0.000 claims abstract description 27
- 239000000446 fuel Substances 0.000 claims description 21
- 238000000034 method Methods 0.000 claims description 4
- 230000002269 spontaneous effect Effects 0.000 abstract description 3
- 230000000644 propagated effect Effects 0.000 abstract 1
- 238000005507 spraying Methods 0.000 abstract 1
- 239000000243 solution Substances 0.000 description 5
- 230000002349 favourable effect Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000008094 contradictory effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
Abstract
The utility model discloses a direct injection ignition system and a heavy methanol engine, wherein the direct injection ignition system comprises a cylinder cover, an oil sprayer and an ignition structure, the oil sprayer is arranged on the cylinder cover and is used for spraying methanol to a combustion chamber, the ignition structure comprises a plurality of spark plugs arranged on the cylinder cover, the spark plugs are arranged at intervals along the circumferential direction of the cylinder cover, the ignition quantity of the ignition structure can be improved, the distance from the ignition position to the side edge of the cylinder cover can be reduced by arranging the spark plugs, so that the ignition structure actively ignites methanol mixed gas in the cylinder cover, and therefore, the distance from the flame center to the tail end of the methanol mixed gas is reduced by arranging the oil sprayer and the ignition structure on the cylinder cover, the propagation distance of the flame along the radial direction of the cylinder cover is reduced, and the methanol mixer at the edge of the cylinder cover is prevented from spontaneous combustion before the flame is not propagated to the side edge of the cylinder cover, so that the heavy methanol engine is easy to pre-ignite or knock due to the fact that the cylinder cover is large.
Description
Technical Field
The utility model relates to the technical field of engines, in particular to a direct injection ignition system and a heavy methanol engine.
Background
Heavy methanol engines in the current market are basically modified and optimized on the traditional diesel engine platform. However, the ignition system of the existing methanol engine is usually an ignition system of a gasoline engine or a gas engine, and because the cylinder body of the existing methanol engine is usually a diesel cylinder body, the diameter of the existing methanol engine is larger, when the ignition system of the gasoline engine is used for ignition, the propagation distance of combustion flame in the engine is longer, so that before the flame does not propagate to the tail end of a combustion chamber, the methanol mixed gas at the tail end is easy to naturally burn or knock, and the engine is prevented from being in fire or unstable combustion, and is easy to fail.
Disclosure of Invention
The utility model mainly aims to provide a direct injection ignition system and a heavy methanol engine, and aims to solve the problem that the existing heavy methanol engine is easy to pre-burn or knock due to a large cylinder body.
In order to achieve the above object, the present utility model provides a direct injection ignition system, comprising:
a cylinder cover;
the fuel injector is arranged in the middle of the cylinder cover and is used for injecting methanol into the combustion chamber of the heavy methanol engine; the method comprises the steps of,
the ignition structure comprises a plurality of spark plugs arranged on the cylinder cover, and the spark plugs are arranged at intervals along the circumferential direction of the cylinder cover;
the projection distance between the spark plug and the oil sprayer on the radial section of the cylinder cover is L, wherein L is more than or equal to 20mm and less than or equal to 80mm.
Optionally, L is more than or equal to 30mm and less than or equal to 60mm;
optionally, the fuel injector is disposed at the center of the cylinder head.
Optionally, two spark plugs are provided.
Optionally, two spark plugs are disposed on two sides of the fuel injector.
Optionally, the distance between the spark plug and the fuel injector is L, wherein L is more than or equal to 20mm and less than or equal to 80.
Optionally, the spark plug is disposed obliquely.
Optionally, an included angle between the extending direction of the spark plug and the thickness direction of the cylinder cover is alpha, wherein alpha is more than or equal to-20 degrees and less than or equal to 20 degrees.
Optionally, the cylinder cover is a flat bottom cylinder cover; or,
the cylinder cover is a ridge type cylinder cover.
Optionally, the cylinder cover is provided with an intake valve and an exhaust valve, and the intake valve and the exhaust valve are respectively arranged at two sides of the fuel injector.
In addition, in order to achieve the above purpose, the present utility model also provides a heavy methanol engine, including the direct injection ignition system, the direct injection ignition system includes:
a cylinder cover;
the fuel injector is arranged in the middle of the cylinder cover and is used for injecting methanol into the combustion chamber of the heavy methanol engine; the method comprises the steps of,
the ignition structure comprises a plurality of spark plugs arranged on the cylinder cover, and the spark plugs are arranged at intervals along the circumferential direction of the cylinder cover;
the projection distance between the spark plug and the oil sprayer on the radial section of the cylinder cover is L, wherein L is more than or equal to 20mm and less than or equal to 80mm.
In the technical scheme of the utility model, the fuel injector is arranged in the middle of the cylinder cover, so that the fuel injector is convenient for directly injecting methanol fuel into the combustion chamber of the heavy methanol engine, is favorable for realizing equivalent combustion or lean homogeneous combustion or even layered combustion of the heavy methanol engine, is favorable for improving the thermal efficiency of the heavy methanol engine, can avoid injecting methanol into the cylinder body of the engine, reduces the risk of wet wall caused by direct injection of the methanol, prevents the methanol from corroding the cylinder body, can improve the ignition quantity of the ignition structure and reduce the distance from the ignition position to the side edge of the cylinder cover by arranging a plurality of spark plugs, so that the ignition structure actively ignites the methanol mixed gas in the cylinder cover, and reduces the distance from the flame center to the tail end of the methanol mixed gas by arranging the fuel injector and the ignition structure on the cylinder cover, the method is beneficial to reducing the propagation distance of flame along the radial direction of the cylinder cover so as to prevent the methanol mixer at the edge of the cylinder cover from spontaneous combustion before the flame propagates to the side edge of the cylinder cover, thereby solving the problem that the engine is easy to pre-ignite or knock due to the large cylinder cover of a heavy methanol engine, in addition, as the flame propagates towards the side edge of the cylinder cover along the radial direction of the cylinder cover after the spark plug is ignited, if the spark plug is closer to the oil injector, the propagation distance of flame towards the side edge of the cylinder cover is farther, the pre-igniting and knocking are more likely to happen, if the spark plug is farther from the oil injector, the projection distance between the spark plug and the oil injector on the radial section of the cylinder cover is L, wherein L which is more than or equal to 20mm is less than or equal to 80mm, so that the propagation distance of flame in the cylinder can be avoided, prevent the engine from generating the preignition and knocking, can guarantee the reliability of ignition of the said ignition structure again.
Drawings
In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present utility model, and other drawings may be obtained according to the structures shown in these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic front view of a first embodiment of a direct injection ignition system according to the present utility model;
FIG. 2 is a schematic elevational view of a second embodiment of the direct injection ignition system of FIG. 1;
fig. 3 is a schematic front view of a third embodiment of the direct injection ignition system of fig. 1.
Reference numerals illustrate:
| reference numerals | Name of the name | Reference numerals | Name of the name |
| 100 | Direct injection ignition system | 31 | Spark plug |
| 1 | Cylinder cover | 4 | Intake valve |
| 2 | Fuel injector | 5 | Exhaust valve |
| 3 | Ignition structure | 6 | Cylinder body |
The achievement of the objects, functional features and advantages of the present utility model will be further described with reference to the accompanying drawings, in conjunction with the embodiments.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
In the case where a directional instruction is involved in the embodiment of the present utility model, the directional instruction is merely used to explain the relative positional relationship, movement condition, etc. between the components in a specific posture, and if the specific posture is changed, the directional instruction is changed accordingly.
In addition, if there is a description of "first", "second", etc. in the embodiments of the present utility model, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present utility model.
Heavy methanol engines in the current market are basically modified and optimized on the traditional diesel engine platform. However, the ignition system of the existing methanol engine is usually an ignition system of a gasoline engine or a gas engine, and because the cylinder body of the existing methanol engine is usually a diesel cylinder body, the diameter of the existing methanol engine is larger, when the ignition system of the gasoline engine is used for ignition, the propagation distance of combustion flame in the engine is longer, so that before the flame does not propagate to the tail end of a combustion chamber, the methanol mixed gas at the tail end is easy to naturally burn or knock, and the engine is prevented from being in fire or unstable combustion, and is easy to fail.
In view of the above, the utility model provides a direct injection ignition system, which aims to solve the problem that the engine is easy to pre-burn or knock due to the large cylinder body of the existing heavy methanol engine. Fig. 1 to fig. 3 are schematic structural diagrams of a direct injection ignition system provided by the utility model.
Referring to fig. 1 to 3, the direct injection ignition system 100 includes a cylinder cover 1, an injector 2 and an ignition structure 3, wherein the injector 2 is disposed in the middle of the cylinder cover 1, and is used for injecting methanol into a combustion chamber of the heavy methanol engine, the ignition structure 3 includes a plurality of spark plugs 31 disposed in the cylinder cover 1, and the plurality of spark plugs 31 are disposed at intervals along a circumferential direction of the cylinder cover 1, and a projection distance between the spark plugs and the injector on a radial section of the cylinder cover is L, wherein L is greater than or equal to 20mm and less than or equal to 80mm.
In the technical scheme of the utility model, the fuel injector 2 is arranged in the middle of the cylinder cover 1, so that the fuel injector is convenient for directly injecting methanol fuel into the combustion chamber of the heavy methanol engine, is favorable for realizing equivalent combustion or lean homogeneous combustion or even layered combustion of the heavy methanol engine, is favorable for improving the thermal efficiency of the heavy methanol engine, can avoid injecting methanol into the cylinder body 6 of the engine, reduces the risk of wet wall caused by direct injection of the methanol, prevents the methanol from corroding the cylinder body 6, and simultaneously can improve the ignition quantity of the ignition structure 3 and reduce the distance from the ignition position to the side edge of the cylinder cover 1 by arranging a plurality of spark plugs 31, so that the ignition structure 3 actively ignites the methanol mixed gas in the cylinder cover 1, so as to reduce the distance from the flame center to the tail end of the methanol mixture, and help to reduce the propagation distance of the flame along the radial direction of the cylinder cover 1, so as to prevent the spontaneous combustion of the methanol mixer at the edge of the cylinder cover 1 before the flame propagates to the side edge of the cylinder cover 1, thereby solving the problem that the engine is easy to be pre-ignited or knocked due to the large cylinder cover 1 of a heavy methanol engine, in addition, as the spark plug 31 is ignited, the flame propagates towards the side edge of the cylinder cover 1 along the radial direction of the cylinder cover 1, if the spark plug 31 is closer to the oil injector 2, the propagation distance of the flame towards the side edge of the cylinder cover 1 is farther, the pre-ignition and the knocking are more likely to happen, if the spark plug 31 is farther from the oil injector 2, the ignition reliability is lower, and the distance between the spark plug 31 and the oil injector 2 is L, wherein L is less than or equal to 20mm, the flame propagation distance in the cylinder can be prevented from being too far, the engine is prevented from being pre-ignited and knocked, and the ignition reliability of the ignition structure 3 can be ensured. It is understood that the cylinder cover and the cylinder body of the heavy methanol engine form a cylinder of the heavy methanol engine, and the radial direction of the cylinder cover is the radial direction of the cylinder of the heavy methanol engine.
Further, L is more than or equal to 30mm and less than or equal to 60mm, so that the propagation distance of flame is reduced on the premise of ensuring the ignition reliability, the engine is prevented from being pre-ignited and knocked, and particularly, when L is 40mm, 45mm or 50mm, the spark plug is positioned between the oil sprayer 2 and the side edge of the cylinder cover 1, and the ignition effect is better. Of course, any value of the above intervals may be used, and the present utility model is not limited thereto.
Because the closer the injector 2 is to the side edge of the cylinder cover, the more likely the problem of wet wall occurs, so the closer the injector 2 is to the center of the cylinder cover, the lower the risk of wet wall occurs, therefore, in this embodiment, the injector 2 is arranged at the center of the cylinder cover 1, so that the risk of direct injection of methanol into the wet wall can be reduced, and the methanol can be uniformly and outwardly diffused in the cylinder body 6, so that the methanol is convenient to be uniformly mixed with the air in the combustion chamber, and the mixing quality of the methanol and the air can be improved.
It should be understood that the fuel injector 2 may be disposed at the center of the cylinder head 1, or may be disposed near the center of the cylinder head 1, etc., which is not limited in the present utility model.
In theory, the greater the number of the spark plugs 31, the more complicated the arrangement of the cylinder head 1 and the higher the cost, and for this reason, in the present embodiment, the two spark plugs 31 are provided, so that it is possible to avoid the engine from being pre-burned or knocked due to the too long flame propagation distance, and also to consider the manufacturing cost of the heavy methanol engine. Further, two spark plugs 31 are provided on both sides of the fuel injector 2, so that the two spark plugs 31 are uniformly arranged in the cylinder head 1, so as to reduce the propagation distance of flame in the cylinder head 1, thereby being beneficial to reducing the pre-ignition or knocking tendency of the engine and improving the thermal efficiency of the engine. It should be understood that the two spark plugs 31 may be symmetrically disposed on two sides of the fuel injector 2, or may be asymmetrically disposed on two sides of the fuel injector 2, and may be specifically adjusted according to the needs, which is not limited in the present utility model.
The cylinder head 1 has various forms, specifically, in an embodiment, referring to fig. 1 and 2, the cylinder head 1 is a flat bottom cylinder head, and compared with a roof-ridge cylinder head 1, the flat bottom cylinder head 1 has a simpler structure and lower cost, so that the flat bottom cylinder head is adopted, so that the cylinder head 1 can borrow the cylinder head 1 of the diesel engine, thereby helping to reduce the cost of the direct injection ignition system 100. In another embodiment, referring to fig. 3, the cylinder cover 1 is a roof-ridge type cylinder cover, and the flat-bottom cylinder cover is adopted because the methanol has similar characteristics to the gasoline, so that the matching degree of the combustion system is lower, and the combustion efficiency of the engine is low, so that the roof-ridge type cylinder cover is adopted, the heavy methanol engine can adopt the combustion chamber structure of the gasoline engine, and the combustion efficiency of the engine is improved.
In theory, the fuel injector 2 is vertically disposed on the cylinder head 1, but because the layout space above the cylinder head 1 is limited, and the spark plug 31 needs to be arranged in other structures, the layout position of the spark plug 31 is occupied, so in this embodiment, referring to fig. 2, the spark plug 31 is obliquely disposed, and thus, by adopting the oblique arrangement, the ignition end located inside the cylinder body 6 can still be disposed at the preset position when the spark plug 31 located outside the cylinder body 6 is at the offset layout position, thereby helping to improve the ignition effect of the direct injection ignition system 100. Further, since the inclination angle of the spark plug 31 is too large, the space occupied by the spark plug 31 is too large and is easy to interfere with other structures, for this reason, in this embodiment, the angle between the extending direction of the spark plug 31 and the thickness direction of the cylinder cover is α, where α is 20 ° or less and 20 °, the spark plug 31 can be adjusted to a preset position, and the space occupied by the spark plug 31 can be reduced, preferably α is 15 ° or less and 15 °, where α between the extending direction of the spark plug 31 and the thickness direction of the cylinder cover can be-10 °, -5 °, 0 °, 2.5 °, 7.5 °, 10 °, or any value of the above intervals, which is not limited in this embodiment.
In order to arrange the valve train, in the present embodiment, the cylinder head 1 is provided with an intake valve 4 and an exhaust valve 5, the intake valve 4 and the exhaust valve 5 being provided on both sides of the injector 2, respectively, so that the distance between the intake valve 4 and the exhaust valve 5 is increased so as to provide the intake valve 4 and the exhaust valve 5 on the cylinder head 1. Of course, in other embodiments, the intake valve 4 and the exhaust valve 5 may be disposed on the same side of the injector 2, and the utility model is not limited thereto.
Further, the ignition structure 3 and the valve train may be arranged in multiple manners, and the ignition structure 3 and the valve train may be arranged on the same straight line or may be arranged on different straight lines, which is not limited in the present utility model, specifically in this embodiment, the intake valve 4 and the exhaust valve 5 are arranged along a first direction, and the two spark plugs 31 are arranged along a second direction, where the first direction and the second direction are arranged in a crossing manner, so that the ignition structure 3 and the valve train are arranged on different straight lines, so as to avoid interference between the ignition structure 3 and the valve train, and to facilitate the ignition structure 3 and the valve train to be arranged on the cylinder cover 1, thereby improving the space utilization of the cylinder cover 1. Specifically, the first direction is disposed orthogonal to the second direction.
In addition, to achieve the above object, the present utility model also provides a heavy methanol engine including the direct injection ignition system 100 described above. It should be noted that, the structure of the direct injection ignition system 100 in the heavy methanol engine may refer to the embodiment of the direct injection ignition system 100 described above, and will not be described herein again; because the direct injection ignition system 100 is used in the heavy methanol engine provided by the utility model, the embodiments of the heavy methanol engine provided by the utility model comprise all the technical schemes of all the embodiments of the direct injection ignition system 100, and the achieved technical effects are identical, and are not repeated here.
The foregoing description is only of the preferred embodiments of the present utility model and is not intended to limit the scope of the utility model, and all equivalent structural changes made by the specification and drawings of the present utility model or direct/indirect application in other related technical fields are included in the scope of the present utility model.
Claims (10)
1. A direct injection ignition system for a heavy duty methanol engine, the direct injection ignition system comprising:
a cylinder cover;
the fuel injector is arranged in the middle of the cylinder cover and is used for injecting methanol into the combustion chamber of the heavy methanol engine; the method comprises the steps of,
the ignition structure comprises a plurality of spark plugs arranged on the cylinder cover, and the spark plugs are arranged at intervals along the circumferential direction of the cylinder cover;
the projection distance between the spark plug and the oil sprayer on the radial section of the cylinder cover is L, wherein L is more than or equal to 20mm and less than or equal to 80mm.
2. The direct injection ignition system of claim 1, characterized in that 30mm +.l +.60 mm.
3. The direct injection ignition system of claim 1, characterized in that the injector is provided in the center of the cylinder head.
4. The direct injection ignition system according to claim 1, characterized in that the spark plugs are provided in two.
5. The direct injection ignition system of claim 4, characterized in that two of said spark plugs are provided on both sides of said fuel injector.
6. The direct injection ignition system of claim 1, characterized in that the spark plug is disposed obliquely.
7. The direct injection ignition system according to claim 6, characterized in that an angle α is formed between an extending direction of the spark plug and a thickness direction of the cylinder head, wherein-20 ° is equal to or less than α is equal to or less than 20 °.
8. The direct injection ignition system of claim 1, characterized in that the cylinder head is a flat bottom cylinder head; or,
the cylinder cover is a ridge type cylinder cover.
9. The direct injection ignition system according to claim 1, characterized in that the cylinder head is provided with an intake valve and an exhaust valve, which are provided on both sides of the injector, respectively.
10. A heavy duty methanol engine comprising a direct injection ignition system as claimed in any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322465650.0U CN220646070U (en) | 2023-09-11 | 2023-09-11 | Direct injection ignition system and heavy methanol engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322465650.0U CN220646070U (en) | 2023-09-11 | 2023-09-11 | Direct injection ignition system and heavy methanol engine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220646070U true CN220646070U (en) | 2024-03-22 |
Family
ID=90295815
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322465650.0U Active CN220646070U (en) | 2023-09-11 | 2023-09-11 | Direct injection ignition system and heavy methanol engine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220646070U (en) |
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2023
- 2023-09-11 CN CN202322465650.0U patent/CN220646070U/en active Active
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