CN112648064A - Engine precombustion chamber structure and engine - Google Patents
Engine precombustion chamber structure and engine Download PDFInfo
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- CN112648064A CN112648064A CN202011524322.8A CN202011524322A CN112648064A CN 112648064 A CN112648064 A CN 112648064A CN 202011524322 A CN202011524322 A CN 202011524322A CN 112648064 A CN112648064 A CN 112648064A
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- engine
- flow guide
- supply channel
- arrangement according
- prechamber
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B19/00—Engines characterised by precombustion chambers
- F02B19/08—Engines characterised by precombustion chambers the chamber being of air-swirl type
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B19/00—Engines characterised by precombustion chambers
- F02B19/12—Engines characterised by precombustion chambers with positive ignition
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B19/00—Engines characterised by precombustion chambers
- F02B19/16—Chamber shapes or constructions not specific to sub-groups F02B19/02 - F02B19/10
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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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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Combustion Methods Of Internal-Combustion Engines (AREA)
Abstract
The invention discloses an engine and a precombustion chamber structure thereof. The engine prechamber structure comprises a body extending in a first direction, and a containing space is arranged in the body. Along first direction, the first end of body is sealed by engine cylinder head and spark plug, and body second end is provided with the connecting hole, and accommodation space passes through the connecting hole and communicates with engine owner combustion chamber. Wherein the area of the engine cylinder head for sealing the first end of the body is provided with a flow guide extending around the first direction. The engine cylinder cover is provided with a gas supply channel which is formed by starting from the first end of the body, extending to be away from the first end of the body and inclining relative to the first direction, the gas supply channel is connected with the flow guide part, and the gas supply channel is used for supplying natural gas to the accommodating space inside the body. The engine prechamber structure of the invention can reduce the natural gas flowing into the body without the bodyThe internal combustion directly leaks into the main combustion chamber of the engine through the connecting hole, so that the CH of the main combustion chamber of the engine is reduced4And (5) discharging.
Description
Technical Field
The invention relates to the technical field of engines, in particular to an engine prechamber structure and an engine.
Background
The space on the engine, which is composed of the cylinder cover, the cylinder sleeve and the top surface of the piston, is a combustion chamber, also called a main combustion chamber, and is an important area for completing the mixing and combustion of fuel and air and pushing the piston to do work. Engines also typically have a pre-chamber to increase the speed of combustion. The precombustion chamber is a semi-closed structure, gas is combusted in the precombustion chamber, and flame is spread into the main combustion chamber through a connecting hole at the end part of the precombustion chamber.
A reasonable prechamber structure is important for combustion and emissions from the engine. The existing engine has the precombustion chamber, so that the combustion speed is improved, but the mixed gas in the precombustion chamber is easy to directly leak to the main combustion chamber through the connecting hole without being combusted in the air intake process, so that the main combustion chamber CH of the engine is caused4The discharge is high. Meanwhile, CO is easy to remain in the precombustion chamber2、H2Combustion products such as O and the like influence the combustion quality of mixed gas in the precombustion chamber, and further influence the normal work of the engine.
Disclosure of Invention
The embodiment of the invention provides an engine and a precombustion chamber structure thereof, and aims to solve the problem of high methane emission of an engine.
In one aspect, an embodiment of the present invention provides an engine prechamber structure, including a body extending along a first direction, where the body has an accommodating space inside, and along the first direction, a first end of the body is sealed by an engine cylinder head and a spark plug, and a second end of the body is provided with a connecting hole, and the accommodating space is communicated with an engine main combustion chamber through the connecting hole, where an area on the engine cylinder head for sealing the first end of the body is provided with a flow guide portion extending around the first direction, and the engine cylinder head is provided with an air supply channel starting from the first end of the body, extending away from the first end of the body, and inclined with respect to the first direction, and the air supply channel is connected with the flow guide portion, and the air supply channel is used for supplying natural gas into the body.
According to an aspect of the embodiment of the present invention, the flow guide portion is an annular structure surrounding the first direction by one circle.
According to an aspect of the embodiment of the present invention, the flow guide portion is an annular structure having an opening surrounding the first direction at a predetermined central angle.
According to an aspect of the embodiment of the present invention, a value of the predetermined central angle is greater than or equal to 180 °.
According to an aspect of the embodiment of the present invention, the air supply passage is connected to the first open end of the flow guide portion.
According to an aspect of the embodiment of the present invention, the second opening end of the flow guide portion is distant from the gas supply passage in the first direction.
According to one aspect of the embodiment of the invention, the flow guide part is a groove-shaped structure formed on the engine cylinder head, and the cross section of the groove-shaped structure is triangular or arc-shaped.
According to one aspect of the embodiment of the invention, the flow guide part is a semi-closed tubular structure, the cross section of the semi-closed tubular structure is triangular or arc-shaped, and the flow guide part is fixedly connected to the engine cylinder head.
According to an aspect of an embodiment of the invention, an inclination angle of the gas supply channel with respect to the first direction is smaller than 90 °.
In another aspect, an embodiment of the present invention provides an engine including the engine prechamber structure as described above.
According to the engine pre-combustion chamber structure provided by the embodiment of the invention, natural gas enters the body through the gas supply channel, the natural gas is combusted in the body, and flame is spread to the engine main combustion chamber through the connecting hole. The natural gas flows through the inclined gas supply channel and has centrifugal force after surrounding the flow guide part extending, a vortex is formed at the first end of the body, the natural gas is slowed down in the flowing inside the body under the action of the vortex, the situation that the natural gas flowing into the inside of the body is directly leaked into the main combustion chamber of the engine through the connecting hole without the internal combustion of the body can be reduced, and therefore the main combustion chamber of the engine can be reducedCH4Discharging, and at the same time, the inclined gas supply channel enables natural gas to discharge CO in the body2、H2The combustion products such as O and the like are fully taken away, and the CO in the body is reduced2、H2And combustion products such as O and the like remain, so that the combustion quality of the mixed gas in the body is improved, and the problem of high methane emission of the engine is solved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments of the present invention will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is an assembly schematic of an engine prechamber arrangement according to an embodiment of the invention;
FIG. 2 is a schematic structural view of an engine prechamber arrangement according to an embodiment of the invention;
FIG. 3 is a partial schematic structural view of an engine prechamber arrangement according to an embodiment of the invention;
FIG. 4 is a schematic diagram of an air supply passage of an engine prechamber arrangement according to an embodiment of the invention at a certain viewing angle;
FIG. 5 is a schematic diagram of an air supply passage and a flow guide portion of an engine prechamber structure according to an embodiment of the invention from another perspective.
Reference numerals:
1-cylinder cover, 2-gasket, 3-body, 4-sealing ring, 5-spark plug, 6-gas supply channel, 7-flow guide portion, 8-spark plug bush and 9-main combustion chamber.
Detailed Description
The embodiments of the present invention will be described in further detail with reference to the drawings and examples. The following detailed description of the embodiments and the accompanying drawings are provided to illustrate the principles of the invention and are not intended to limit the scope of the invention, i.e., the invention is not limited to the described embodiments.
In the description of the present invention, it is to be noted that, unless otherwise specified, the terms "first" and "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; "plurality" means two or more; the terms "inner", "outer", "top", "bottom", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the referred devices or elements must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
The combustion chamber of the engine is a space formed by the cylinder cover 1, the cylinder sleeve and the top surface of the piston, is also called as a main combustion chamber 9, and is an important area for finishing the mixing and combustion of fuel and air and pushing the piston to do work. Engines, particularly gas engines, also typically have a pre-chamber inside which a mixture of natural gas and air is burned, and the flame propagates through a connecting hole in the end of the pre-chamber into the main chamber 9, increasing the combustion speed of the main chamber 9.
Referring to fig. 1, 2 and 3, the engine prechamber structure according to the embodiment of the invention includes a body 3 extending along a first direction, the body 3 has an accommodating space therein, a first end of the body 3 is sealed by an engine cylinder head 1 and a spark plug 5 along the first direction, a second end of the body 3 is provided with a connecting hole, the accommodating space is communicated with an engine main combustion chamber 9 through the connecting hole, a flow guide portion 7 extending around the first direction is provided in a region of the engine cylinder head 1 for sealing the first end of the body 3, the engine cylinder head 1 is provided with a gas supply channel 6 extending from the first end of the body 3 away from the first end of the body 3 and inclined with respect to the first direction, the gas supply channel 6 is connected with the flow guide portion 7, and the gas supply channel 6 is used for supplying natural gas to the accommodating space inside the body 3. In this embodiment, natural gas is introduced into the interior of the body 3 through the gas supply passage 6, the natural gas is burned in the interior of the body 3, and flame propagates to the engine main combustion chamber 9 through the connecting hole. The natural gas has centrifugal force after flowing through inclined gas supply channel 6 and the guide part 7 extending around, and forms vortex at the first end of the body 3, the natural gas is slowed down in the flowing inside the body 3 under the action of the vortex, and the natural gas flowing into the inside of the body 3 can be reducedThe condition that the fuel directly leaks into the main combustion chamber 9 of the engine through the connecting hole without the internal combustion of the body 3 occurs, so that the CH of the main combustion chamber 9 of the engine can be reduced4And (5) discharging.
At the same time, the inclined gas supply channel 6 enables the natural gas to transport the CO inside the body 32、H2The combustion products such as O and the like are fully taken away, and CO in the body 3 is reduced2、H2The combustion quality of the mixed gas in the body 3 is improved by the residue of combustion products such as O and the like.
Wherein the body 3 is mounted in the engine cylinder head 1, a section of the body 3 near the second end is sealed with the cylinder head 1 by a gasket 2, and the pressing force for sealing is transmitted by means of a spark plug bush 8 outside the spark plug 5. The first end of the body 3 and the spark plug bush 8 can be sealed by a sealing ring 4, and the sealing ring 4 can be an O-shaped rubber ring. The cylinder head 1 is provided with passages for engine intake and exhaust.
The precombustion chamber structure of the embodiment can be suitable for conventional gas engines and also suitable for gas engines with large cylinder diameters.
Referring to fig. 5, as an alternative embodiment, the flow guiding portion 7 is a ring-shaped structure surrounding the first direction.
The water conservancy diversion portion 7 of this embodiment is the continuous closed loop structure who encircles first direction, and air feed channel 6 can be connected with the arbitrary district section of water conservancy diversion portion 7, and the natural gas flows into body 3 inside by air feed channel 6, and the water conservancy diversion portion 7 of flowing through, under the mating reaction of air feed channel 6 and water conservancy diversion portion 7, the natural gas forms the vortex at the first end of body 3, reduces not burning in body 3 inside and the natural gas that directly flows into main combustion chamber 9, reduces the CH of main combustion chamber 94And (5) discharging.
As an alternative embodiment, the flow guide portion 7 is an annular structure with an opening surrounding the first direction at a predetermined central angle.
The guiding portion 7 of this embodiment is an incomplete annular structure surrounding the first direction, and the guiding portion 7 cooperates with the gas supply channel 6, so that the natural gas forms a vortex at the first end of the body 3. Although the strength of the swirl is slightly weaker than that of the closed-loop flow guide portion 7, the amount of non-combustion inside the body 3 can be reducedThe natural gas directly flowing into the main combustion chamber 9 achieves the effect of reducing CH of the main combustion chamber 94The purpose of discharging.
As an alternative, the predetermined central angle is greater than or equal to 180 °, preferably greater than 180 °, in particular to increase the swirl strength and reduce the CH4 emissions of the main chamber 9 as much as possible.
As an alternative embodiment, the air supply channel 6 is connected to a first open end of the flow guide 7.
In the present embodiment, the gas supply channel 6 is connected to one of the two open ends of the flow guide part 7, and the natural gas flows from one end of the flow guide part 7 connected to the gas supply channel 6 to the other end of the flow guide part 7 along the extending track of the flow guide part 7 to form a vortex.
Alternatively, the gas supply channel 6 may also be connected to a middle section of the flow guide 7, from which natural gas flows towards both ends of the flow guide 7, forming a vortex.
As an alternative embodiment, the second open end of the flow guide 7 is distant from the air supply channel 6 in the first direction.
In this embodiment, when the first direction is a vertical direction, the height of the second open end of the flow guide part 7 may be lower than that of the first open end, and the natural gas spirally flows along the extending track of the flow guide part 7, forming a vortex inclined with respect to the first direction, so that the vortex coverage is larger and the effect is stronger.
As an alternative embodiment, the flow guide portion 7 is a groove-shaped structure formed on the engine cylinder head 1, and the cross section of the groove-shaped structure is triangular or arc-shaped, so that the eddy effect can be enhanced.
The cross-sectional shape of the trough-like structure of this embodiment may also be other shapes with less sharp corners and less pronounced, such as trapezoids.
When the flow guide part 7 is an annular structure with an opening surrounding the first direction according to a preset central angle, and the air supply channel 6 is connected with the first opening end of the flow guide part 7, the second opening end of the flow guide part 7 is far away from the first opening end in the first direction. In a specific implementation, the groove depth of the first opening end of the flow guide part 7 of the groove-shaped structure is larger than that of the second opening end, and the groove depth of the flow guide part 7 can be gradually reduced from the first opening end to the second opening end.
As an alternative embodiment, the flow guide part 7 is a semi-closed tubular structure, the cross section of the semi-closed tubular structure is triangular or arc-shaped, and the flow guide part 7 is fixedly connected to the engine cylinder cover 1.
The semi-closed tubular structure of the present embodiment is formed by cutting the tubular structure along the axial direction of the tubular structure, and may be a half of the tubular structure, or may be more than or less than half of the tubular structure. The cross-sectional shape of the semi-closed tubular structure may be a less angular, less pronounced shape, such as a triangle, arc, trapezoid, or the like.
When the flow guide part 7 is an annular structure with an opening surrounding the first direction according to a preset central angle, and the air supply channel 6 is connected with the first opening end of the flow guide part 7, the second opening end of the flow guide part 7 is far away from the first opening end in the first direction. In a specific implementation, when the first direction is a vertical direction, the height of the first open end of the flow guide part 7 of the semi-closed tubular structure is higher than that of the second open end, and the height of the flow guide part 7 can gradually decrease from the first open end to the second open end.
As an alternative embodiment, in conjunction with fig. 4, the angle of inclination of the gas supply channel 6 with respect to the first direction takes a value of less than 90 °.
In the present embodiment, the gas supply passage 6 is inclined both with respect to the first direction and with respect to the vertical direction of the first direction. In a specific implementation, when the first direction is a vertical direction, the air supply channel 6 is inclined both with respect to the vertical direction and with respect to the horizontal direction. Compare in setting up along vertical direction, the gas feed channel 6 that the slope set up is favorable to on the one hand making the natural gas form the vortex at the first end of body 3 with the cooperation of water conservancy diversion portion 7, and on the other hand can directly reduce not at the inside burning of body 3 and the natural gas that directly flows into main combustion chamber 9, and the unilateral or synthesize, the homoenergetic reaches the CH that reduces main combustion chamber 94The purpose of discharging.
Wherein, the inclination size of gas supply channel 6 for first direction to and the size specification and the cross sectional shape of water conservancy diversion portion 7 all can be adjusted according to actual need, with the natural gas burning quality in can satisfying body 3 better, natural gas burning quality and main combustion chamber 9 emission requirement are the principle in the main combustion chamber 9.
It should be understood by those skilled in the art that the foregoing is only illustrative of the present invention, and the scope of the present invention is not limited thereto. It will be apparent to those skilled in the art that various changes and modifications may be made in the present application without departing from the spirit and scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is intended to include such modifications and variations as well.
Claims (10)
1. An engine prechamber structure, comprising a body extending in a first direction, the body having an accommodation space inside, along the first direction, a first end of the body being sealed by an engine cylinder head and a spark plug, a second end of the body being provided with a connection hole, the accommodation space being in communication with an engine main combustion chamber through the connection hole, wherein:
a flow guide part extending around the first direction is arranged on the area of the engine cylinder cover for sealing the first end of the body;
be provided with on the engine cylinder head by the first end of body begins, extends and keeps away from the first end of body, and for the gas supply channel of first direction slope, gas supply channel with water conservancy diversion portion meets, gas supply channel be used for to the body is inside to provide the natural gas.
2. An engine prechamber arrangement according to claim 1, characterised in that the flow guide is an annular structure which runs all the way around the first direction.
3. The engine prechamber structure according to claim 1, characterized in that the flow guide is an annular structure with openings that surrounds the first direction at a predetermined central angle.
4. An engine prechamber arrangement according to claim 3, characterised in that the predetermined central angle has a value of more than or equal to 180 °.
5. An engine prechamber arrangement according to claim 3, characterised in that the air supply channel is connected with the first open end of the flow guide.
6. An engine prechamber arrangement according to claim 5, characterised in that the second open end of the flow guide is remote from the air supply channel in the first direction.
7. An engine prechamber arrangement according to claim 1, characterised in that the flow guide is a trough-like structure formed in the engine cylinder head, the cross-sectional shape of which is triangular or curved.
8. The engine prechamber structure of claim 1, characterized in that the flow guide is a semi-closed tubular structure, the cross-sectional shape of which is triangular or curved, the flow guide being fixedly connected to the engine cylinder head.
9. An engine prechamber arrangement according to claim 1, characterised in that the angle of inclination of the air supply channel with respect to the first direction takes a value of less than 90 °.
10. An engine comprising an engine prechamber arrangement according to any of claims 1 to 9.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011524322.8A CN112648064B (en) | 2020-12-22 | 2020-12-22 | Engine precombustion chamber structure and engine |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011524322.8A CN112648064B (en) | 2020-12-22 | 2020-12-22 | Engine precombustion chamber structure and engine |
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| CN112648064A true CN112648064A (en) | 2021-04-13 |
| CN112648064B CN112648064B (en) | 2022-06-28 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115111046A (en) * | 2022-01-27 | 2022-09-27 | 长城汽车股份有限公司 | Pre-combustion chamber of engine and engine |
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| JPH08226330A (en) * | 1995-02-21 | 1996-09-03 | Isuzu Motors Ltd | Auxiliary-chamber type engine |
| CN105332788A (en) * | 2015-12-08 | 2016-02-17 | 中国船舶重工集团公司第七一一研究所 | Prechamber device for gas engine |
| CN106014694A (en) * | 2016-05-06 | 2016-10-12 | 山东大学 | Air-assisted gas ejector and combustion system and method for large-cylinder-diameter gas engine pre-combustion chamber |
| CN110284991A (en) * | 2019-06-26 | 2019-09-27 | 哈尔滨工程大学 | A kind of natural gas engine structure and its burning tissues method |
| CN112065567A (en) * | 2020-09-07 | 2020-12-11 | 中国第一汽车股份有限公司 | Engine combustion system |
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2020
- 2020-12-22 CN CN202011524322.8A patent/CN112648064B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08226330A (en) * | 1995-02-21 | 1996-09-03 | Isuzu Motors Ltd | Auxiliary-chamber type engine |
| CN105332788A (en) * | 2015-12-08 | 2016-02-17 | 中国船舶重工集团公司第七一一研究所 | Prechamber device for gas engine |
| CN106014694A (en) * | 2016-05-06 | 2016-10-12 | 山东大学 | Air-assisted gas ejector and combustion system and method for large-cylinder-diameter gas engine pre-combustion chamber |
| CN110284991A (en) * | 2019-06-26 | 2019-09-27 | 哈尔滨工程大学 | A kind of natural gas engine structure and its burning tissues method |
| CN112065567A (en) * | 2020-09-07 | 2020-12-11 | 中国第一汽车股份有限公司 | Engine combustion system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115111046A (en) * | 2022-01-27 | 2022-09-27 | 长城汽车股份有限公司 | Pre-combustion chamber of engine and engine |
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| CN112648064B (en) | 2022-06-28 |
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