CN208396823U - Large open combustion chamber and combustion system - Google Patents
Large open combustion chamber and combustion system Download PDFInfo
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- CN208396823U CN208396823U CN201820347732.1U CN201820347732U CN208396823U CN 208396823 U CN208396823 U CN 208396823U CN 201820347732 U CN201820347732 U CN 201820347732U CN 208396823 U CN208396823 U CN 208396823U
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- combustion chamber
- circular arc
- central boss
- combustion
- piston
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- 238000002485 combustion reaction Methods 0.000 title claims abstract description 77
- 239000000446 fuel Substances 0.000 claims abstract description 27
- 239000007921 spray Substances 0.000 claims abstract description 21
- 230000006698 induction Effects 0.000 claims description 4
- 230000000747 cardiac effect Effects 0.000 claims description 2
- 239000000295 fuel oil Substances 0.000 abstract description 5
- 230000002093 peripheral effect Effects 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 3
- 239000003921 oil Substances 0.000 description 3
- 230000007812 deficiency Effects 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000010790 dilution Methods 0.000 description 1
- 239000012895 dilution Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000004299 exfoliation Methods 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 230000001970 hydrokinetic effect Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000004071 soot Substances 0.000 description 1
Landscapes
- Combustion Methods Of Internal-Combustion Engines (AREA)
Abstract
The fuel injector (2) is arranged in the center of the top of a cylinder cover (1), the combustion chamber (5) comprises a central boss (6) in the middle and a peripheral circular arc (8), the opening diameter D1 of the combustion chamber (5) is 0.9D-0.94D, the depth H1 is 0.08D-0.10D, the radius R1 of the circular arc (8) is 0.15D-0.18D, the distance D2 between the circular arc centers of the circular arcs (8) on two opposite sides is 0.6D-0.68D, the radius R2 of the central boss (6) is 0.15D-0.2D, the D is the diameter of a cylinder, the included angle between the straight line segments (7) on two opposite sides of the central boss (6) is 155-165 degrees, and the distance H2 between the central boss (6) and the top surface of the combustion chamber (5) is 4.5-6.5 mm. The fuel oil spray can be prevented from contacting with the wall surface of the combustion chamber (5), the heat transfer loss is reduced, and the high heat efficiency of the engine is ensured.
Description
Technical field
The utility model relates to a kind of combustion chamber, more specifically to a kind of big open end combustion chamber and combustion system belong to
In mixed Daqu in cylinder of diesel engine and field of combustion technology.
Background technique
Modern directly jetting turbo charging burning chamber of diesel engine mostly uses the toroidal combustion chamber with necking, or contracts in toroidal combustion chamber
It is excessive using a small stair between mouth and piston-top surface.High pressure fuel injects directly on combustion chamber throat position, so that distribution
Fuel ratio in combustion recess increases, and top of combustion chamber air utilization ratio is low, incomplete combustion, and the thermal efficiency is low；In addition,
To adapt to, engine specific power increases and the increasingly strict rigors of emission regulation, piston especially throat site are faced with more
The test of high mechanical load and thermic load is easy to appear the problems such as piston aditus laryngis oxidative exfoliation or aditus laryngis crack, influences piston
Reliability.
A kind of Chinese invention patent " the diesel engine of big angle between spray orifices and long overhang atomizer and the cooperation of heavy caliber combustion chamber
Combustion system " spray of the combustion system atomizer in (application number: the 2015101584830.8, applying date: on September 16th, 2015)
Hole angle >=160 degree angle, it is 3-6% that spray orifice, which stretches out cylinder cap baseplane amount,；The surface of atomizer can be set heat insulating coat or every
Hot jacket or inside set cooling chamber；For high-speed diesel engine heavy caliber chamber diameter >=cylinder diameter 85%, depth≤stroke
12%, for medium seed diesel engine heavy caliber chamber diameter >=cylinder diameter 92%, depth≤stroke 10%.Using the above burning
System structure, air-fuel mixture quality is relatively more preferable, and then reduces fuel consumption and discharge；Bowl in piston is flat, is conducive to
Top land thickness is shortened, weight is mitigated, reduces reciprocal inertia force and vibration.But the patent of invention have the following deficiencies: 1,
Angle between spray orifices >=160 degree the angle of combustion system atomizer described in the invention, big angle between spray orifices can be sprayed at burning
Room is radially sprayed farther, and with piston downlink, big angle between spray orifices can be such that fuel impingement cylinder wall risk increases, wall temperature
Lower, this part fuel oil cannot evaporate rapidly and flow into crankcase, lead to oil dilution.2, the invention combustion system fuel oil
It is inhaled with after air mixing to last volume, combustion chamber upper space is cylindrical body, and the diameter of cylinder is d, with spraying development, fuel oil
Combustion chamber wall surface may be hit, heat transfer loss is caused to increase, the thermal efficiency reduces.
Summary of the invention
The purpose of this utility model is that increasing for fuel impingement cylinder wall risk existing for existing combustion chamber, thermal effect
The low deficiency of rate provides a kind of big open end combustion chamber and combustion system.
To achieve the above object, the technical solution of the utility model is: a kind of big open end combustion chamber and combustion system,
Including cylinder head, cylinder sleeve, piston and combustion chamber, the combustion chamber is the toroidal combustion chamber of symmetrical structure, the top land
Combustion chamber cavity is formed between cylinder head bottom surface, the cylinder head center of top is provided with fuel injector, the combustion chamber
The circular arc of central boss including middle part and periphery, the circular arc top connect with piston-top surface, the central boss and outside
It is connected between the circular arc enclosed by straightway, and the straightway is tangent with central boss and circular arc respectively, the burning
Room opening diameter D1=0.9D~0.94D, combustion-chamber depth H1=0.08D~0.10D, the arc radius R1=0.15D
~0.18D, distance D2=0.6D~0.68D, the central boss radius R2=between the center of arc of opposite sides circular arc
0.15D~0.2D, above-mentioned D are cylinder bore, and the angle between central boss opposite sides straightway is 155 °~165 °,
Distance H2 of the central boss away from combustion chamber top surface is 4.5mm~6.5mm.
The fuel injector is multiple orifice nozzle, and fuel injector spray orifice number is the hole 6-7, and angle between spray orifices are 148 °~152 °.
The combustion system uses Four valve structure, and inlet and exhaust valve each 2, induction swirl ratio is 0~0.5.
Compared with prior art, the beneficial effects of the utility model are:
1, in the utility model combustion chamber be symmetrical structure toroidal combustion chamber, simple shape is compact-sized；And combustion chamber
Depth H 1=0.08D~0.10D is smaller, so that combustion chamber is in set to be distributed in piston in flat, advantageously reduces piston pressure
Contracting is high, and then can reduce engine overall mass, reduces volume and reduce the friction loss of engine complete machine.
2, combustion chamber openings diameter D1=0.9D~0.94D in the utility model, i.e. combustion chamber bore are set using big open end
Meter, reduces combustion chamber surface to volume ratio, reduces opposite heat dissipation area.
3, combustion chamber openings diameter D1=0.9D~0.94D in the utility model, arc radius R1=0.15D~0.18D,
Distance D2=0.6D~0.68D between the center of arc of opposite sides circular arc, central boss radius R2=0.15D~0.2D, in
Angle between cardiac prominence platform opposite sides straightway is 155 °~165 °, and distance H2 of the central boss away from cylinder head bottom surface is
4.5mm~6.5mm；And 2 spray orifice number of fuel injector is the hole 6-7, angle between spray orifices are 148 °~152 °.Therefore it passes through Proper Match
The parameters such as fuel injection parameter and chamber structure can evade fuel spray and chamber wall face contact, reduce heat transfer loss, guarantee
The engine thermal efficiency with higher；So that emission level can reach the discharge of state six after engine Proper Match after-treatment device.
Detailed description of the invention
Fig. 1 is the utility model vertical section schematic diagram.
Fig. 2 is combustion-chamber parameter schematic diagram in the utility model.
Fig. 3 is that the utility model fuel oil sprays schematic diagram.
Fig. 4 is the utility model top view.
In figure, cylinder head 1, fuel injector 2, cylinder sleeve 3, piston 4, combustion chamber 5, central boss 6, straightway 7, circular arc 8.
Specific embodiment
The utility model is described in further detail below in conjunction with Detailed description of the invention and specific embodiment.
Referring to Fig. 1, a kind of big open end combustion chamber and combustion system, including cylinder head 1, cylinder sleeve 3, piston 4 and combustion chamber 5,
1 center of top of cylinder head is provided with fuel injector 2.The combustion chamber 5 is the toroidal combustion chamber of symmetrical structure, entire to burn
5 pit of room is symmetric about piston 4, so that combustion chamber 5 is in flat；The piston 4 top and 1 bottom surface of cylinder head it
Between formed 5 cavity of combustion chamber.
Referring to Fig. 1, the combustion chamber 5 includes the central boss 6 at middle part and the circular arc 8 of periphery, 8 top of circular arc
Connect with 4 top surface of piston；It is connected between the central boss 6 and the circular arc 8 of periphery by straightway 7, and the straightway 7
It is tangent with central boss 6 and circular arc 8 respectively.
Referring to fig. 2, the 5 opening diameter D1=0.9D~0.94D of combustion chamber, 5 depth H 1=0.08D of combustion chamber~
0.10D；The 8 radius R1=0.15D~0.18D of circular arc, distance D2=0.6D between the center of arc of opposite sides circular arc 8
~0.68D, central boss 6 the radius R2=0.15D~0.2D, above-mentioned D are cylinder bore.
Referring to fig. 2, the angle between 6 opposite sides straightway 7 of central boss is 155 °~165 °, and central boss 6 is away from combustion
The distance H2 for burning 5 top surface of room is 4.5mm~6.5mm.
Referring to Fig. 1, the fuel injector 2 is multiple orifice nozzle, and 2 central axis of fuel injector is overlapped with 4 central axis of piston；
2 spray orifice number of fuel injector is the hole 6-7, and angle between spray orifices are 148 °~152 °.
Referring to Fig. 1 to Fig. 2, the combustion system use Four valve structure, inlet and exhaust valve each 2, induction swirl ratio 0
~0.5.
Referring to Fig. 1 to Fig. 2, the utility model passes through Proper Match fuel injection parameter and the parameters such as combustion chamber 5 and combustion system
Fuel spray can be evaded to contact with 5 wall surface of combustion chamber, when high pressure fuel sprays into combustion chamber 5, spraying induced movement is accounted for absolutely
To advantage, initial flow-field is smaller to mixed influence in cylinder, can simplify inlet structure, reduces restriction loss, to protect
The engine thermal efficiency with higher and lower oil consumption are demonstrate,proved, engine economy is improved.When engine Proper Match post-processes
After device, emission level can reach the discharge of state six
Referring to Fig. 1 to Fig. 2, embodiment one:
A kind of big open end chamber structure, wherein D1=119mm, D2=82mm, H1=11.9mm, H2=5mm, a1=
160 °, R1=20mm, R2=20mm.The fuel injector 2 is multiple orifice nozzle, 2 central axis of fuel injector and 4 central axis of piston
It is overlapped, it is 6 holes that fuel injector, which sprays 2 hole numbers, and angle between spray orifices are 150 °.The burning of this combustion system uses Four valve structure, intake and exhaust
Each 2, door, induction swirl ratio 0.4.By hydrokinetics calculation, the present embodiment and currently existing scheme are compared, rated point oil
Consumption reduces by 3%, and soot reduces by 37%；Therefore restriction loss is reduced, improves engine economy.
It, cannot the above content is specific preferred embodiment further detailed description of the utility model is combined
Assert that the specific implementation of the utility model is only limited to these instructions.For the ordinary skill of the utility model technical field
For personnel, without departing from the concept of the premise utility, a number of simple deductions or replacements can also be made, above structure
It all shall be regarded as belonging to the protection scope of the utility model.
Claims (3)
1. a kind of big open end combustion chamber and combustion system, including cylinder head (1), cylinder sleeve (3), piston (4) and combustion chamber (5), institute
The toroidal combustion chamber that combustion chamber (5) are symmetrical structure is stated, is formed and is fired between cylinder head (1) bottom surface at the top of the piston (4)
Room (5) cavity is burnt, the cylinder head (1) center of top is provided with fuel injector (2), and the combustion chamber (5) include middle part
The circular arc (8) of central boss (6) and periphery, the circular arc (8) top connect with piston (4) top surface, the central boss (6)
Periphery circular arc (8) between by straightway (7) connect, and the straightway (7) respectively with central boss (6) and circular arc
(8) tangent, it is characterised in that: described combustion chamber (5) opening diameter D1=0.9D~0.94D, combustion chamber (5) depth H 1=
0.08D~0.10D, the circular arc (8) radius R1=0.15D~0.18D, between the center of arc of opposite sides circular arc (8)
Distance D2=0.6D~0.68D, the central boss (6) radius R2=0.15D~0.2D, above-mentioned D are cylinder bore, in
Angle between cardiac prominence platform (6) opposite sides straightway (7) is 155 °~165 °, and central boss (6) is away from combustion chamber (5) top surface
Distance H2 is 4.5mm~6.5mm.
2. a kind of big open end combustion chamber according to claim 1 and combustion system, it is characterised in that: the fuel injector
It (2) is multiple orifice nozzle, fuel injector (2) spray orifice number is the hole 6-7, and angle between spray orifices are 148 °~152 °.
3. a kind of big open end combustion chamber according to claim 1 and combustion system, it is characterised in that: the combustion system
Using Four valve structure, inlet and exhaust valve each 2, induction swirl ratio is 0~0.5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820347732.1U CN208396823U (en) | 2018-03-14 | 2018-03-14 | Large open combustion chamber and combustion system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820347732.1U CN208396823U (en) | 2018-03-14 | 2018-03-14 | Large open combustion chamber and combustion system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208396823U true CN208396823U (en) | 2019-01-18 |
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ID=65064330
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820347732.1U Active CN208396823U (en) | 2018-03-14 | 2018-03-14 | Large open combustion chamber and combustion system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208396823U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108343527A (en) * | 2018-03-14 | 2018-07-31 | 东风商用车有限公司 | Large open combustion chamber and combustion system |
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2018
- 2018-03-14 CN CN201820347732.1U patent/CN208396823U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108343527A (en) * | 2018-03-14 | 2018-07-31 | 东风商用车有限公司 | Large open combustion chamber and combustion system |
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