CN107747513A - A kind of large diesel engine stepped ramp type combustion chamber - Google Patents
A kind of large diesel engine stepped ramp type combustion chamber Download PDFInfo
- Publication number
- CN107747513A CN107747513A CN201710917566.4A CN201710917566A CN107747513A CN 107747513 A CN107747513 A CN 107747513A CN 201710917566 A CN201710917566 A CN 201710917566A CN 107747513 A CN107747513 A CN 107747513A
- Authority
- CN
- China
- Prior art keywords
- combustion chamber
- diesel engine
- ramp type
- large diesel
- stepped ramp
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- 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
- F02B23/00—Other engines characterised by special shape or construction of combustion chambers to improve operation
- F02B23/02—Other engines characterised by special shape or construction of combustion chambers to improve operation with compression ignition
- F02B23/06—Other engines characterised by special shape or construction of combustion chambers to improve operation with compression ignition the combustion space being arranged in working piston
- F02B23/0672—Omega-piston bowl, i.e. the combustion space having a central projection pointing towards the cylinder head and the surrounding wall being inclined towards the cylinder center axis
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
- F02F3/00—Pistons
- F02F3/26—Pistons having combustion chamber in piston head
-
- 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
Abstract
A kind of large diesel engine stepped ramp type combustion chamber, including by piston-top surface（7）The combustor exit being sequentially connected to bottom of combustion chamber（8）, straight mouth combustion chamber throat（9）, pit（5）And central boss（6）, described combustor exit（8）For ledge structure；Ledge structure includes the arc section being from top to bottom sequentially connected（1）, step erect section（2）With step crosspiece（4）, step crosspiece（4）Lower end passes through chamfering I and straight mouth combustion chamber throat（9）It is connected.Ledge structure has guide functions the air-flow for above fuel oil more oriented combustion chamber, coordinating injection volume to inhale can preferably can be utilized the air of top and middle part so that Soot discharges are obvious to be reduced.
Description
Technical field
The present invention relates to a kind of combustion chamber, more specifically to a kind of large diesel engine stepped ramp type combustion chamber, belong to vapour
Car engine and related system technical field.
Background technology
Referring to Fig. 6, at present, in existing frequently-used large diesel engine chamber structure combustor exit 8 be typically fillet or
Angle, pattern are generally necking or straight degree of lip-rounding formula, specific as shown in Figure 6.The region that combustion chambers burn mainly occurs is pit 5
Point, existing large diesel engine chamber structure to the air on combustion chamber top using less, and the O after EGR is added2Containing quantitative change
It is few so that fuel oil incomplete combustion generates higher Soot discharges.
The content of the invention
It is an object of the invention to for air utilization of the existing large diesel engine chamber structure to combustion chamber top
Less, fuel oil incomplete combustion generates the problem of higher Soot discharges, there is provided a kind of large diesel engine stepped ramp type combustion chamber.
To achieve the above object, technical solution of the invention is：A kind of large diesel engine stepped ramp type combustion chamber, including
The combustor exit that is sequentially connected by piston-top surface to bottom of combustion chamber, straight mouth combustion chamber throat, pit and central boss, it is described
Combustor exit be ledge structure.
The combustor exit ledge structure includes the perpendicular section of arc section, step being from top to bottom sequentially connected and step is horizontal
Section, described step crosspiece lower end is connected by chamfering I with straight mouth combustion chamber throat.
Described step erects section and is connected by chamfering II with step crosspiece.
Described ledge structure is highly 2-5mm.
Compared with prior art, the beneficial effects of the invention are as follows：
Combustor exit is ledge structure in the present invention, novel, simple in construction, and stronger flowing point can be produced at step
From forming small turbulent flow and whirlpool, contribute to air-fuel mixture；And ledge structure has guide functions fuel oil can be more oriented to combustion
Burn above room, coordinate the air-flow that injection volume is inhaled preferably to utilize the air of top and middle part so that the obvious drop of Soot discharges
It is low.
Brief description of the drawings
Fig. 1 is schematic structural view of the invention.
Fig. 2 is stepped ramp type combustion chamber and ordinary straight mouth combustion chamber dynamic property comparison diagram in the present invention.
Fig. 3 is stepped ramp type combustion chamber and ordinary straight mouth combustion chamber Soot discharge comparison diagrams in the present invention.
Fig. 4 is stepped ramp type combustion chamber equivalent proportion distribution map in the present invention.
Fig. 5 is ordinary straight mouth combustion chamber equivalent proportion distribution map in the present invention.
Fig. 6 is large diesel engine chamber structure schematic diagram present in the present invention.
In figure, arc section 1, step erects section 2, chamfering 3, step crosspiece 4, pit 5, central boss 6, piston-top surface 7, burning
Room outlet 8, straight mouth combustion chamber throat 9.
Embodiment
Below in conjunction with brief description of the drawings, the present invention is described in further detail with embodiment.
Referring to Fig. 1, a kind of large diesel engine stepped ramp type combustion chamber is arranged on the top of piston, including by piston-top surface 7 to
Combustor exit 8, straight mouth combustion chamber throat 9, pit 5 and central boss 6, the central boss 6 that bottom of combustion chamber is sequentially connected be
Combustion chamber center cone boss, its height cannot interfere with spraying；Pit 5 is the bottom being connected with central boss 6
Portion's arc groove；Described combustor exit 8 is ledge structure.This chamber diameter and depth ratio (D/H) they are 3.9-4.1, its
Middle D is chamber diameter, and H is combustion-chamber depth；The height Tm spans of central boss 6 are 5-12mm.
Referring to Fig. 1, the ledge structure of combustor exit 8 includes the perpendicular section of arc section 1, step being from top to bottom sequentially connected
2 and step crosspiece 4, the described lower end of step crosspiece 4 be connected by chamfering I with straight mouth combustion chamber throat 9.Further, institute
The step stated erects section 2 and is connected by chamfering II 3 with step crosspiece 4.
Referring to Fig. 1, described ledge structure height H1 is 2-5mm；Ledge structure height H1 herein is referred to from burning
Step crosspiece 4 and the point of contact of crosspiece one end of the straight chamfering I of mouth combustion chamber throat 9 are arrived in ceiling face 7.
Referring to Fig. 2 to Fig. 5, pass through simulation computer and experiment, behind this motion combustion chamber, the obvious drop of Soot discharges
It is low, illustrated below by taking certain heavy duty diesel engine combustion chamber as an example：The heavy duty diesel engine Combustion chamber design is step
Type combustion chamber, it can be seen that improving dynamic property, the obvious drop of Soot discharges by using stepped ramp type combustion chamber from Fig. 2 and Fig. 3
It is low；From Fig. 4 and Fig. 5 it can be seen that under same crank angle, the distributed areas of gaseous mixture are wider in stepped ramp type combustion chamber, special
It is not to be significantly better than plain combustion chamber in the distribution of combustion chamber upper area.
Above content is to combine specific preferred embodiment further description made for the present invention, it is impossible to is assert
The specific implementation of the present invention is confined to these explanations.For general technical staff of the technical field of the invention,
On the premise of not departing from present inventive concept, some simple deduction or replace can also be made, said structure should be all considered as belonging to
Protection scope of the present invention.
Claims (4)
1. a kind of large diesel engine stepped ramp type combustion chamber, including by piston-top surface（7）The burning being sequentially connected to bottom of combustion chamber
Room exports（8）, straight mouth combustion chamber throat（9）, pit（5）And central boss（6）, it is characterised in that：Described combustor exit
（8）For ledge structure.
A kind of 2. large diesel engine stepped ramp type combustion chamber according to claim 1, it is characterised in that：The combustor exit
（8）Ledge structure includes the arc section being from top to bottom sequentially connected（1）, step erect section（2）With step crosspiece（4）, described platform
Rank crosspiece（4）Lower end passes through chamfering I and straight mouth combustion chamber throat（9）It is connected.
A kind of 3. large diesel engine stepped ramp type combustion chamber according to claim 2, it is characterised in that：Described step erects section
（2）Pass through chamfering II（3）With step crosspiece（4）It is connected.
4. it is a kind of described large diesel engine stepped ramp type combustion chamber according to claim 1, it is characterised in that：Described Step-edge Junction
Structure is highly 2-5mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710917566.4A CN107747513A (en) | 2017-09-30 | 2017-09-30 | A kind of large diesel engine stepped ramp type combustion chamber |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710917566.4A CN107747513A (en) | 2017-09-30 | 2017-09-30 | A kind of large diesel engine stepped ramp type combustion chamber |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107747513A true CN107747513A (en) | 2018-03-02 |
Family
ID=61254739
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710917566.4A Pending CN107747513A (en) | 2017-09-30 | 2017-09-30 | A kind of large diesel engine stepped ramp type combustion chamber |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107747513A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113482762A (en) * | 2021-07-30 | 2021-10-08 | 东风商用车有限公司 | Combustion chamber and combustion system of medium-heavy diesel engine |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202194718U (en) * | 2011-08-04 | 2012-04-18 | 安徽全柴动力股份有限公司 | Combustor chamber of diesel engine capable of satisfying homogeneous charge compression ignition |
| CN104595007A (en) * | 2015-01-16 | 2015-05-06 | 东风商用车有限公司 | Straight-wall double swirl combustion chamber for diesel engine |
| CN105909420A (en) * | 2016-06-14 | 2016-08-31 | 广西玉柴机器股份有限公司 | Combustion chamber capable of reducing soot in diesel engine cylinder |
| CN207598346U (en) * | 2017-09-30 | 2018-07-10 | 东风商用车有限公司 | A kind of large diesel engine stepped ramp type combustion chamber |
-
2017
- 2017-09-30 CN CN201710917566.4A patent/CN107747513A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202194718U (en) * | 2011-08-04 | 2012-04-18 | 安徽全柴动力股份有限公司 | Combustor chamber of diesel engine capable of satisfying homogeneous charge compression ignition |
| CN104595007A (en) * | 2015-01-16 | 2015-05-06 | 东风商用车有限公司 | Straight-wall double swirl combustion chamber for diesel engine |
| CN105909420A (en) * | 2016-06-14 | 2016-08-31 | 广西玉柴机器股份有限公司 | Combustion chamber capable of reducing soot in diesel engine cylinder |
| CN207598346U (en) * | 2017-09-30 | 2018-07-10 | 东风商用车有限公司 | A kind of large diesel engine stepped ramp type combustion chamber |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113482762A (en) * | 2021-07-30 | 2021-10-08 | 东风商用车有限公司 | Combustion chamber and combustion system of medium-heavy diesel engine |
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| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20180302 |
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| WD01 | Invention patent application deemed withdrawn after publication |