CN207598346U - Heavy diesel engine step type combustion chamber - Google Patents
Heavy diesel engine step type combustion chamber Download PDFInfo
- Publication number
- CN207598346U CN207598346U CN201721303549.3U CN201721303549U CN207598346U CN 207598346 U CN207598346 U CN 207598346U CN 201721303549 U CN201721303549 U CN 201721303549U CN 207598346 U CN207598346 U CN 207598346U
- Authority
- CN
- China
- Prior art keywords
- combustion chamber
- diesel engine
- type combustion
- ramp type
- 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.)
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Links
- 238000002485 combustion reaction Methods 0.000 title claims abstract description 50
- 239000004071 soot Substances 0.000 abstract description 7
- 239000000295 fuel oil Substances 0.000 abstract description 4
- 238000002347 injection Methods 0.000 abstract description 2
- 239000007924 injection Substances 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 239000008246 gaseous mixture Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
Classifications
-
- 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
Landscapes
- Combustion Methods Of Internal-Combustion Engines (AREA)
Abstract
A heavy diesel engine stepped combustion chamber comprises a combustion chamber outlet (8), a straight combustion chamber throat (9), a pit (5) and a central boss (6) which are sequentially connected from a piston top surface (7) to the bottom of the combustion chamber, wherein the combustion chamber outlet (8) is of a stepped structure; the step structure comprises an arc section (1), a step vertical section (2) and a step transverse section (4) which are sequentially connected from top to bottom, and the lower end of the step transverse section (4) is connected with a straight combustion chamber throat (9) through a chamfer I. The step structure has a diversion effect and can guide fuel oil to the upper part of the combustion chamber more, and air in the upper part and the middle part can be better utilized by matching with air flow of injection entrainment, so that the Soot emission is obviously reduced.
Description
Technical field
The utility model is related to a kind of combustion chamber, more specifically to a kind of large diesel engine stepped ramp type combustion chamber belongs to
In automobile 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 added in2Containing quantitative change
It is few so that fuel oil incomplete combustion produces higher Soot discharges.
Invention content
The purpose of this utility model is that for existing large diesel engine chamber structure to the air on combustion chamber top
The problem of higher Soot is discharged is produced using less, fuel oil incomplete combustion, a kind of large diesel engine stepped ramp type combustion is provided
Burn room.
To achieve the above object, the technical solution of the utility model is：A kind of large diesel engine stepped ramp type combustion chamber,
Including by piston-top surface to the sequentially connected combustor exit of bottom of combustion chamber, straight mouth combustion chamber throat, pit and central boss,
The combustor exit is step structure.
The combustor exit step structure includes from top to bottom sequentially connected arc section, step and erects section and step horizontal stroke
Section, the step crosspiece lower end is connected by chamfering I with straight mouth combustion chamber throat.
The step erects section and is connected by chamfering II with step crosspiece.
The step structure height is 2-5mm.
Compared with prior art, the beneficial effects of the utility model are：
Combustor exit is step structure in the utility model, novel, simple in structure, can be generated at step stronger
Flow separation, form small turbulent flow and whirlpool, contribute to air-fuel mixture；And step structure has guide functions that fuel oil is more
Above ground oriented combustion chamber, the air-flow that cooperation injection volume is inhaled can preferably utilize the air of top and middle part so that Soot is arranged
It puts and is substantially reduced.
Description of the drawings
Fig. 1 is the utility model structure diagram.
Fig. 2 is stepped ramp type combustion chamber and ordinary straight mouth combustion chamber dynamic property comparison diagram in the utility model.
Fig. 3 is stepped ramp type combustion chamber and ordinary straight mouth combustion chamber Soot discharge comparison diagrams in the utility model.
Fig. 4 is stepped ramp type combustion chamber equivalent proportion distribution map in the utility model.
Fig. 5 is ordinary straight mouth combustion chamber equivalent proportion distribution map in the utility model.
Fig. 6 is large diesel engine chamber structure schematic diagram present in the utility model.
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.
Specific embodiment
The utility model is described in further detail below in conjunction with description of the drawings and specific 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
The sequentially connected combustor exit 8 of bottom of combustion chamber, straight mouth combustion chamber throat 9, pit 5 and central boss 6, central boss 6 are
Combustion chamber center cone boss, height cannot interfere with spraying；Pit 5 is the bottom being connected with central boss 6
Portion's arc groove；The combustor exit 8 is step structure.This chamber diameter is 3.9-4.1 with depth ratio (D/H),
Middle D is chamber diameter, and H is combustion-chamber depth；6 height Tm value ranges of central boss are 5-12mm.
Referring to Fig. 1,8 step structure of combustor exit is including from top to bottom sequentially connected arc section 1, step erect section
2 and step crosspiece 4,4 lower end of step crosspiece 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, the step structure height H1 is 2-5mm；Step structure height H1 herein is referred to from burning
Step crosspiece 4 and the point of contact of crosspiece one end of straight 9 chamfering I of mouth combustion chamber throat 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 apparent drop of Soot discharges
It is low, it is illustrated by taking certain heavy duty diesel engine combustion chamber as an example below：The heavy duty diesel engine Combustion chamber design is step
Type combustion chamber, it can be seen that improving dynamic property, the apparent 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
Be not combustion chamber upper area distribution be significantly better than plain combustion chamber.
The above content is combine specific preferred embodiment further detailed description of the utility model, it is impossible to
Assert that the specific implementation of the utility model is confined to these explanations.For the ordinary skill of the utility model technical field
For personnel, without departing from the concept of the premise utility, several simple deduction or replace, above structure can also be made
The scope of protection of the utility model should be all considered as belonging to.
Claims (4)
1. a kind of large diesel engine stepped ramp type combustion chamber, including by piston-top surface（7）To the sequentially connected burning of bottom of combustion chamber
Room exports（8）, straight mouth combustion chamber throat（9）, pit（5）And central boss（6）, it is characterised in that：The combustor exit
（8）For step structure.
2. a kind of large diesel engine stepped ramp type combustion chamber according to claim 1, it is characterised in that：The combustor exit
（8）Step structure includes sequentially connected arc section from top to bottom（1）, step erect section（2）With step crosspiece（4）, the platform
Rank crosspiece（4）Lower end passes through chamfering I and straight mouth combustion chamber throat（9）It is connected.
3. a kind of large diesel engine stepped ramp type combustion chamber according to claim 2, it is characterised in that：The step erects section
（2）Pass through chamfering II（3）With step crosspiece（4）It is connected.
4. it is a kind of large diesel engine stepped ramp type combustion chamber according to claim 1, it is characterised in that：The Step-edge Junction
Structure height is 2-5mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721303549.3U CN207598346U (en) | 2017-09-30 | 2017-09-30 | Heavy diesel engine step type combustion chamber |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721303549.3U CN207598346U (en) | 2017-09-30 | 2017-09-30 | Heavy diesel engine step type combustion chamber |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207598346U true CN207598346U (en) | 2018-07-10 |
Family
ID=62755618
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721303549.3U Active CN207598346U (en) | 2017-09-30 | 2017-09-30 | Heavy diesel engine step type combustion chamber |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207598346U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107747513A (en) * | 2017-09-30 | 2018-03-02 | 东风商用车有限公司 | Heavy diesel engine step type combustion chamber |
| 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 |
-
2017
- 2017-09-30 CN CN201721303549.3U patent/CN207598346U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107747513A (en) * | 2017-09-30 | 2018-03-02 | 东风商用车有限公司 | Heavy diesel engine step type combustion chamber |
| 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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| GR01 | Patent grant |