CN101871405A - Rapid combustion chamber of natural gas engine - Google Patents
Rapid combustion chamber of natural gas engine Download PDFInfo
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- CN101871405A CN101871405A CN201010186874A CN201010186874A CN101871405A CN 101871405 A CN101871405 A CN 101871405A CN 201010186874 A CN201010186874 A CN 201010186874A CN 201010186874 A CN201010186874 A CN 201010186874A CN 101871405 A CN101871405 A CN 101871405A
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- natural gas
- engine
- rapid combustion
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Abstract
The invention aims to provide a rapid combustion chamber of a natural gas engine. The rapid combustion chamber comprises a cylinder cover, a piston upper surface, a cylinder wall and a spark plug, wherein the cylinder cover is of a bathtub shape; the piston upper surface is of a wedge-shaped bump which is positioned on one side of a gas off-take; and the spark plug is arranged at the midpoint of an intersection line of the side surface and the top surface of the cylinder cover and is positioned on one side of the gas off-take. Due to the optimal design of a combustion chamber of the natural gas engine, flame propagation distance is shortened; simultaneously by controlling the intensity of squish flow in a cylinder, the squish flow on the opposite sides of the spark plug is coupled with the vortex in the cylinder effectively so as to increase the turbulent kinetic energy in the cylinder; the mixed concentration demixing from the top to the bottom and from thick to thin is realized in the cylinder by adopting a mode of performing fuel injection after an inlet stroke so as to ensure reliable ignition, realize rapid combustion, and expand the thin limit of the stable operation of the engine; and therefore, the fuel economy and the emission performance of the engine are improved.
Description
Technical field
What the present invention relates to is a kind of firing chamber, and specifically being used for fuel is the natural gas burning chamber.
Background technique
Increasing sharply of automobile pollution becomes increasingly conspicuous energy shortage and environmental pollution problem, fuel economy and the emission regulation demands of automaker in order to reach current strictness, the reply intense market competition, active research and the advanced engine technology of employing, also drop into a large amount of man power and materials simultaneously and explore the automobile alternative energy source, development alternative-fuel engine technology.In all alternative energy sources, rock gas is the abundantest primary energy, and it is cleaner to burn, and therefore becomes the most real solution of tackling energy shortage in advance, solving environmental pollution problem.In order to give full play to the advantage of rock gas as the engine washing energy, lean-burn and EGR technology are used usually, but the physicochemical property of rock gas self has determined there is fiery temperature height and velocity of propagation of flame waits problem slowly, engine for combusting weak mixture or when adding EGR particularly, velocity of combustion further reduces, cyclical variations increase, when near motor stable operation lean flammability limit, meeting generating unit divided combustion even the phenomenon of catching fire are therefore by being optimized the combustion of natural gas system architecture, air motion and the advanced engine control technology of employing are improved engine combustion process in rationalization's cylinder, the expansion motor moves rare limit becomes the current research emphasis.
When development of natural gas motor on the petrol engine basis, because the octane value of rock gas is apparently higher than gasoline, uprising performance is good, the compression ratio of natural gas engine can bring up to 10.5～12, and the firing chamber of former petrol engine is positioned at cylinder cap, the head of piston is generally flat-top, in order to shorten the Products Development cycle, reduce development cost, manufacturers of engines can be avoided the cylinder cap structure is done bigger change as far as possible, only the piston head shape is designed, but simply protruding top of processing can't make the state of engine operation in the best on flat head piston, need improve the natural gas engine combustion process by the piston crown Shape optimization designs.
Summary of the invention
The object of the present invention is to provide a kind of rapid combustion chamber of natural gas engine that to realize rapid combustion, expansion motor stable operation lean flammability limit.
The object of the present invention is achieved like this:
A kind of rapid combustion chamber of natural gas engine of the present invention, comprise cylinder cap, piston upper surface, cylinder wall and spark plug, it is characterized in that: cylinder cap is a bath in a tub shape, piston upper surface is that wedge shape projection and wedge shape projection are positioned at air outlet channel one side, spark plug be installed in the side of cylinder cap and end face meld line mid point, be positioned at intake duct one side.
A kind of rapid combustion chamber of natural gas engine of the present invention can also comprise:
The height of described wedge shape projection is 10～13mm, and the angle on wedge shape convex top inclined-plane and piston upper surface plane is 17～21 °, and the side of wedge shape projection is parallel with the cylinder cap wall, and the squish gap that the side of wedge shape projection and cylinder cap wall form is 1.5～3mm.
Advantage of the present invention is: by the fire chamber of natural gas engine structure optimization design, shorten flame travel, simultaneously by controlling to squeezing intensity of flow in the cylinder, make the spark plug offside squeeze stream and realize effectively coupling with the interior eddy current of cylinder, increase the Turbulent Kinetic in the cylinder, carry out mode that fuel sprays in the intake stroke later stage and in cylinder, realize from top to bottom from thick to thin melting concn layering by adopting, guarantee reliable ignition and realize rapid combustion, the rare limit of expansion motor stable operation, thus motor fuel Economy and emission performance improved.
Description of drawings
Fig. 1 is a structural representation of the present invention;
Fig. 2 is the axial cross section of the present invention through the piston center.
Embodiment
For example the present invention is done description in more detail below in conjunction with accompanying drawing:
In conjunction with Fig. 1～2, a kind of rapid combustion chamber of natural gas engine of the present invention is the enclosed space that is surrounded by cylinder cap 1, cylinder wall 3 and piston upper surface 4, cylinder cap 1 is bath in a tub shape cylinder cap, piston upper surface 4 has a wedge shape projection 2, this wedge shape projection 2 is arranged in the offside of spark plug 5, the height h=10～13mm of wedge shape projection 2; Angle between wedge shape projection 2 top plan and piston upper surface 4 planes is: α=17～21 °; Wedge shape projection 2 sides are parallel with cylinder cap 1 wall and constitute the squish face, and the squish gap is δ=1.5～3mm, and engine compression ratio is 11; Wedge shape projection 2 this arrangements can make the space of fire chamber of natural gas engine mainly be distributed near the spark plug 5, thereby can shorten flame travel, and wedge shape projection 2 forms the squish face with spark plug 5 offside cylinder caps 1 wall, fuel in rapid burning period in the spark plug 5 offside squish volumes is squeezed into and participates in burning before the flame in the front cover, wedge shape projection 2 can be controlled gas flow direction in the spark plug 5 offside squish volumes simultaneously, effectively be coupled with the eddy current in the cylinder, stronger crowded stream destroys the interior vortex structure of cylinder can increase Turbulent Kinetic in the cylinder, thereby accelerates whole chemical reaction course.In the aspirating stroke later stage fuel is sprayed into the intake valve ingress of intake duct, and enter in the cylinder, in igniting initial stage cylinder, realize top-down mixture strength layering, guarantee that natural gas engine realizes igniting and rapid combustion reliably with air.
Claims (2)
1. rapid combustion chamber of natural gas engine, comprise cylinder cap, piston upper surface, cylinder wall and spark plug, it is characterized in that: cylinder cap is a bath in a tub shape, piston upper surface is that wedge shape projection and wedge shape projection are positioned at air outlet channel one side, spark plug be installed in the side of cylinder cap and end face meld line mid point, be positioned at intake duct one side.
2. a kind of rapid combustion chamber of natural gas engine according to claim 1, it is characterized in that: the height of described wedge shape projection is 10～13mm, the angle on wedge shape convex top inclined-plane and piston upper surface plane is 17～21 °, the side of wedge shape projection is parallel with the cylinder cap wall, and the squish gap that the side of wedge shape projection and cylinder cap wall form is 1.5～3mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010186874A CN101871405A (en) | 2010-05-31 | 2010-05-31 | Rapid combustion chamber of natural gas engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010186874A CN101871405A (en) | 2010-05-31 | 2010-05-31 | Rapid combustion chamber of natural gas engine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101871405A true CN101871405A (en) | 2010-10-27 |
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ID=42996463
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201010186874A Pending CN101871405A (en) | 2010-05-31 | 2010-05-31 | Rapid combustion chamber of natural gas engine |
Country Status (1)
| Country | Link |
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| CN (1) | CN101871405A (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0025831A1 (en) * | 1979-09-15 | 1981-04-01 | Mahle Gmbh | Otto engine with piston with a raised portion at its head |
| US4284044A (en) * | 1978-07-20 | 1981-08-18 | Toyota Jidosha Kogyo Kabushiki Kaisha | Combustion chamber of an internal combustion engine |
| US4318376A (en) * | 1979-02-26 | 1982-03-09 | Toyota Jidosha Kogyo Kabushiki Kaisha | Combustion chamber of an internal combustion engine |
| US5305720A (en) * | 1992-02-28 | 1994-04-26 | Mitsubishi Jidosha Kogyo Kabushiki Kaisha | Internal combustion engine |
| JPH108970A (en) * | 1996-06-26 | 1998-01-13 | Nissan Motor Co Ltd | Direct cylinder injection type spark ignition engine |
| JPH11182247A (en) * | 1997-12-17 | 1999-07-06 | Fuji Heavy Ind Ltd | Combustion chamber structure for direct injection type engine |
| CN1312885A (en) * | 1998-08-11 | 2001-09-12 | 法国马涅蒂·马雷利公司 | Piston with active guiding head and associated combustion chamber |
| CN2521406Y (en) * | 2001-12-31 | 2002-11-20 | 天津大学 | Cyclone combustion chamber for high-speed ignition engine |
-
2010
- 2010-05-31 CN CN201010186874A patent/CN101871405A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4284044A (en) * | 1978-07-20 | 1981-08-18 | Toyota Jidosha Kogyo Kabushiki Kaisha | Combustion chamber of an internal combustion engine |
| US4318376A (en) * | 1979-02-26 | 1982-03-09 | Toyota Jidosha Kogyo Kabushiki Kaisha | Combustion chamber of an internal combustion engine |
| EP0025831A1 (en) * | 1979-09-15 | 1981-04-01 | Mahle Gmbh | Otto engine with piston with a raised portion at its head |
| US5305720A (en) * | 1992-02-28 | 1994-04-26 | Mitsubishi Jidosha Kogyo Kabushiki Kaisha | Internal combustion engine |
| JPH108970A (en) * | 1996-06-26 | 1998-01-13 | Nissan Motor Co Ltd | Direct cylinder injection type spark ignition engine |
| JPH11182247A (en) * | 1997-12-17 | 1999-07-06 | Fuji Heavy Ind Ltd | Combustion chamber structure for direct injection type engine |
| CN1312885A (en) * | 1998-08-11 | 2001-09-12 | 法国马涅蒂·马雷利公司 | Piston with active guiding head and associated combustion chamber |
| CN2521406Y (en) * | 2001-12-31 | 2002-11-20 | 天津大学 | Cyclone combustion chamber for high-speed ignition engine |
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Application publication date: 20101027 |