CN203335281U - EGR air mixing device and fuel oil engine with EGR system - Google Patents
EGR air mixing device and fuel oil engine with EGR system Download PDFInfo
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- CN203335281U CN203335281U CN2013203124929U CN201320312492U CN203335281U CN 203335281 U CN203335281 U CN 203335281U CN 2013203124929 U CN2013203124929 U CN 2013203124929U CN 201320312492 U CN201320312492 U CN 201320312492U CN 203335281 U CN203335281 U CN 203335281U
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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
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- Y02T10/12—Improving ICE efficiencies
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Abstract
The utility model provides an EGR air mixing device and a fuel oil engine with an EGR system. The EGR air mixing device comprises an EGR leading-in pipe and a Venturi mixer. The Venturi mixer comprises a contraction section, a throat section and a diffusion section. The diffusion section is provided with a connector and the EGR leading-in pipe is communicated with the diffusion section. The throat section and the diffusion section are of an integrated structure. The throat section is embedded into the connector of the diffusion section, an annular gap in the circumferential direction of the throat section is reserved in the embedded portion, and a certain angle is formed between the annular gap and the axis of the throat section. The contraction section is connected with the diffusion section in the position of the connector of the diffusion section in a sealing mode. According to the EGR air mixing device, the annular gap is reserved between the throat section and the diffusion section, EGR gas is led into a gas inlet pipe through the gap and is mixed with inlet air, so that the objective that the EGR gas is thoroughly mixed with fresh air is guaranteed, the evenness of the EGR rate in each cylinder is improved, and therefore the EGR rate of the fuel oil engine is effectively improved.
Description
Technical field
The utility model relates to technical field of engines, especially, relates to a kind of EGR air mixing device and with the fuel engine of egr system.
Background technique
Along with Abgasgesetz is more and more stricter, also more and more higher to the requirement that comprises diesel engine and petrolic fuel engine.Take supercharged diesel engine as example, and supercharged diesel engine needs larger exhaust gas recirculatioon (EGR, Exhaust Gas Recirculation) rate could meet emission regulation demands.For turbo-charged diesel, the pressure of pressure after lower than gas compressor before turbine under some operating modes, the EGR that is difficult to reach required leads.The exhaust gas recirculatioon technology is one of effective measures that reduce motor NOx discharge.Exhaust gas recirculatioon refers to that the part waste gas that motor is discharged is transmitted back to air intake branch, and again enters cylinder together with incoming mixture.Owing to containing a large amount of carbon dioxide in waste gas, and carbon dioxide can not burn and absorbs a large amount of heat, and the combustion temperature of mixed gas in cylinder is reduced, thereby has reduced the growing amount of NOx.
For supercharged diesel engine, the air inlet middle pressure is higher than the exhaust middle pressure.Yet, the high pressure egr system, realize that EGR need to satisfied condition be: turbine front exhaust pressure higher than in cold rear suction pressure.That is, inlet and outlet pressure differential deltap P=(whirlpool front exhaust pressure-in cold rear suction pressure)>0; For supercharged diesel engine, only when low-load, Δ P just is greater than 0, and at the high load region Δ, P is less than 0, if do not take ancillary method, EGR can't realize.
For making waste gas be back to smoothly gas handling system, adoptable ancillary method mainly contains two classes: increase exhaust back pressure or reduce partial admission's pressure.Wherein, the method for increase exhaust back pressure usually adopts and adds exhaust shutter or use variable-geometry cross section turbosupercharger (VGT, Variable Geometry Turbochargers) to realize after turbine.Yet, add exhaust shutter and can cause arranging temperature rise, burn deterioration, smoke intensity sharply increases, and the adverse consequencess such as fuel oil consumption increase, so can not adopt.Use the diesel engine of VGT, during high load, can improve exhaust pressure by the circulation area that reduces turbine, and then the EGR while increasing high load leads.But facts have proved, if EGR, VGT final controlling element are controlled respectively and can not be made them simultaneously in optimum work operating point, the coupling of EGR-VGT is coordinated to control to be only and is realized that EGR leads the prerequisite of accurately controlling.There are some researches show by the multivariable feedback controller device and coordinate to control EGR, VGT, can under the condition that meets the Engine torque requirement, realize the minimum discharge of NOx, but adopt VGT to have the shortcomings such as cost is high, control is complicated.Make Δ P>0 for reducing partial admission's pressure, usually adopt suction tude serial connection throttle valve or Venturi tube after intercooler to realize.Can reduce charging efficiency but add intake-air throttle valve, Economy is incurred loss.The Venturi tube of connecting in gas handling system (Venturi tube), can reduce the gas pressure after gas compressor, at high load, realizes that sufficient EGR leads, and little to the negative effect of fuel consumption rate, and tool has an enormous advantage.
The major way that prior art is introduced EGR in suction tude is to adopt Three way type, adopts the EGR pipe directly to be connected with venturi mixer aditus laryngis section.Yet, the Three way type mixer directly is communicated with the EGR pipe with the aditus laryngis section, just the side at air inlet pipeline imports EGR gas, therefore, can cause in whole suction tude cross section local EGR gas concentration too high, can't realize that waste gas mixes with the even of fresh air or incoming mixture, cause each cylinder EGR skewness.EGR, in each cylinder maldistribution, can make the trade-off relation of NOx and particulate (PM) worsen, that is, the NOx that reduces as much can cause the smoke intensity increase more, has reduced the effect of EGR aspect the reduction discharge, also can cause fuel consume to increase simultaneously.
In a word, need the urgent technical problem solved of those skilled in the art to be exactly: to impel EGR gas to mix with fresh air, guarantee that EGR, in each cylinder distributed uniform, makes fuel engine also can reach qualified EGR when high load and leads.
The model utility content
Technical problem to be solved in the utility model is to provide a kind of EGR air mixing device, effectively improves EGR and leads.
In order to address the above problem, provide a kind of EGR air mixing device on the one hand, comprise EGR inlet tube and venturi mixer, above-mentioned venturi mixer comprises: contraction section, aditus laryngis section, diffuser; Above-mentioned diffuser is provided with interface, and above-mentioned EGR inlet tube is communicated with above-mentioned diffuser interface; Above-mentioned aditus laryngis section and above-mentioned diffuser are structure as a whole, and above-mentioned aditus laryngis section embeds in above-mentioned diffuser interface, at the interlocking position, leave along the circumferential annulus of above-mentioned aditus laryngis section, and above-mentioned annulus and above-mentioned aditus laryngis section axis are angled; Above-mentioned contraction section and above-mentioned diffuser are tightly connected at above-mentioned diffuser jointing.
Preferably, the scope of above-mentioned annulus and above-mentioned aditus laryngis section axis angulation is 30 °～60 °.
Preferably, above-mentioned contraction section is connected by flange seal with above-mentioned diffuser interface.
Preferably, above-mentioned contraction section and above-mentioned diffuser interface adopt welding manner to be tightly connected.
Accordingly, also provide a kind of fuel engine with egr system, comprised the EGR air mixing device, above-mentioned EGR air mixing device comprises venturi mixer and EGR inlet tube, and above-mentioned venturi mixer comprises: contraction section, aditus laryngis section, diffuser; Above-mentioned diffuser is provided with interface, and above-mentioned EGR inlet tube is communicated with above-mentioned diffuser interface; Above-mentioned aditus laryngis section and above-mentioned diffuser are structure as a whole, and above-mentioned aditus laryngis section embeds in above-mentioned diffuser interface, at the interlocking position, leave along the circumferential annulus of above-mentioned aditus laryngis section, and above-mentioned annulus and above-mentioned aditus laryngis section axis are angled; Above-mentioned contraction section and above-mentioned diffuser are tightly connected at above-mentioned diffuser jointing.
Preferably, the scope of above-mentioned annulus and above-mentioned aditus laryngis section axis angulation is 30 °～60 °.
Preferably, above-mentioned contraction section is connected by flange seal with above-mentioned diffuser interface.
Preferably, above-mentioned contraction section and above-mentioned diffuser interface adopt welding manner to be tightly connected.
Preferably, the above-mentioned fuel engine with egr system also comprises: turbosupercharger, intercooler, cooler for recycled exhaust gas, EGR valve; The gas part that motor is discharged enters the turbo machine of turbosupercharger; A part enters the diffuser of venturi mixer through cooler for recycled exhaust gas and EGR valve through the EGR inlet tube, with the gas compressor through turbosupercharger, fresh air or the mixed gas of intercooler, mix, and flows to motor.
Preferably, above-mentioned fuel engine is diesel engine.
Compared with prior art, a technological scheme in technique scheme has the following advantages: in the EGR air mixing device embodiment that the utility model provides, leave an annulus between aditus laryngis section and diffuser, and gap and aditus laryngis section axis are angled, EGR gas is introduced suction tude and is mixed with air inlet from gap, can guarantee fully mixing of EGR gas and fresh air, make each cylinder EGR lead the uniformity and improve.Visible, the EGR that the EGR air mixing device that adopts the utility model to provide can effectively improve fuel engine leads.
The accompanying drawing explanation
Fig. 1 is the utility model EGR air mixing device embodiment's structural representation;
Fig. 2 is the structural representation of the fuel engine preferred embodiment of the utility model band egr system.
Embodiment
For above-mentioned purpose of the present utility model, feature and advantage can be become apparent more, below in conjunction with the drawings and specific embodiments, the utility model is described in further detail.
With reference to Fig. 1, show a kind of EGR air mixing device of the utility model embodiment's structural representation, comprising: EGR inlet tube 1 and venturi mixer.Wherein, venturi mixer comprises: contraction section 2, aditus laryngis section 3 and diffuser 4.Wherein, diffuser 4 is provided with diffuser interface 5.EGR inlet tube 1 designs on diffuser interface 5, and is communicated with diffuser 4.Aditus laryngis section 3 embeds in diffuser interface 5, at the interlocking position, leaves and the annulus 6 circumferential along aditus laryngis section 3.The axis of annulus 6 and aditus laryngis section 3 α that has a certain degree.Contraction section 2 is tightly connected at diffuser interface 5 places with diffuser 4.
Preferably, venturi mixer can be designed as two-part structure, and wherein, aditus laryngis section 3 is designed to integrative-structure with contraction section 2, and diffuser 4 and diffuser interface 5 are designed to integrative-structure.
Due to the axis of annulus 6 and aditus laryngis section 3 α that has a certain degree, institute so that the waste gas of EGR inlet tube 1 introducing from annulus 6, with certain reference angle α, enter in diffuser 4, the airflow direction meaned referring to the direction of arrow in figure.The angular range of α is 30 °～60 °.
The utility model EGR air mixing device embodiment's working principle is: live gas enters from contraction section 2, and along with cross section reduces gradually, the pressure of live gas increases, and it is large that flow velocity also becomes thereupon.At this moment, in aditus laryngis section 3, produce a degree of vacuum, by middle circumferential weld 6, EGR gas is inhaled in venturi mixer, mix with air inlet, EGR is fully also mixed equably with live gas, guarantee EGR distributed uniform in each cylinder of motor.It should be noted that, for diesel engine, above-mentioned live gas can be fresh air; For petrol engine, above-mentioned live gas can be the mixed gas of air and gasoline.That is, above-mentioned live gas can be fresh air or incoming mixture.
In the utility model embodiment, contraction section 2 can be connected by flange seal with diffuser interface 5, also can adopt the modes such as welding to be tightly connected.
To sum up, in the EGR air mixing device embodiment that the utility model provides, leave an annulus between aditus laryngis section and diffuser, and annulus and aditus laryngis section axis are angled, EGR gas is introduced suction tude and is mixed with air inlet from annulus, can guarantee fully mixing of EGR gas and fresh air or incoming mixture, make each cylinder EGR lead the uniformity and improve.Visible, the EGR that the EGR air mixing device that adopts the utility model to provide can effectively improve fuel engine leads.In the utility model preferred embodiment, venturi mixer is designed to two-part, simple in structure, compact, easy to process, and be easy to adopt the method for casting to process, be applicable to mass production.
It should be noted that, the EGR air mixing device that the utility model embodiment provides is not only applicable to the diesel engine with egr system, also is applicable to the petrol engine with egr system herein.
Accordingly, the utility model also provides a kind of fuel engine with egr system that comprises above-mentioned arbitrary EGR air mixing device embodiment, wherein, the EGR inlet tube is connected with the gas exhaust manifold of motor, and the diffuser of venturi mixed gas is connected with the intake manifold of motor.
With reference to Fig. 2, show the schematic diagram of the fuel engine preferred embodiment of the utility model band egr system, comprising: engine body 21, cooler for recycled exhaust gas 22, EGR valve 23, venturi mixer 24, intercooler 25, EGR inlet tube, turbosupercharger.Wherein, venturi mixer comprises: contraction section, aditus laryngis section, diffuser.Turbosupercharger comprises gas compressor 26 and turbo machine 27.
As shown in Figure 2, the suction port of turbo machine 27 is connected with the gas exhaust manifold of engine body 21, and relief opening is connected on the outlet pipe (not shown); The suction port of gas compressor 26 is connected with air-strainer (not shown) pipeline, relief opening is connected with the suction port of intercooler 25, the relief opening of intercooler 25 is connected with the contraction section of venturi mixer 24, and the diffuser of venturi mixer is connected on intake manifold; The suction port of cooler for recycled exhaust gas 22 also is connected with the gas exhaust manifold of motor, relief opening is connected with the suction port of EGR valve 23, the relief opening of EGR valve 23 is connected with the suction port of EGR inlet tube, and the relief opening of EGR inlet tube is connected with the diffuser interface of venturi mixer.
The gas part that engine body 21 is discharged enters the turbo machine 27 of turbosupercharger; A part enters venturi mixer 24 through cooler for recycled exhaust gas 22 and EGR valve 23 through the EGR inlet tube, with the gas compressor 26 through turbosupercharger, fresh air or the mixed gas of intercooler 25, mixes, and flows to engine body 21.Engine body 21 can be diesel engine or petrol engine.
In the embodiment of the fuel engine with egr system who provides at the utility model, the diffuser of venturi mixer is provided with interface, and the EGR inlet tube is communicated with the diffuser interface; The aditus laryngis section embeds the diffuser interface, at the interlocking position, leaves the annulus circumferential along the aditus laryngis section, and the axis of annulus and aditus laryngis section has a certain degree; Contraction section and diffuser are tightly connected at the diffuser jointing.
Preferably, the scope of the axis angulation of above-mentioned annulus and aditus laryngis section is 30 °～60 °, and the angular range that makes EGR gas enter the reference angle of diffuser is 30 °～60 °.
Preferably, venturi mixer is designed to two-part structure, and wherein, aditus laryngis section and contraction section are structure as a whole, and diffuser and diffuser interface are structure as a whole.The venturi mixer provided in the present embodiment is simple in structure, compact, easy to process, and is easy to adopt the method processing of casting, is applicable to batch production.
In the motor embodiment who provides in model utility, contraction section can be connected by flange seal with the diffuser interface, also can adopt the modes such as welding to be tightly connected.
Each embodiment in this specification all adopts the mode of going forward one by one to describe, and what each embodiment stressed is and other embodiments' difference that between each embodiment, identical similar part is mutually referring to getting final product.For system embodiment, because it is substantially similar to device embodiment, so description is fairly simple, relevant part gets final product referring to device embodiment's part explanation.
Above to a kind of EGR air mixing device provided by the utility model, and a kind of fuel engine with egr system, be described in detail, applied specific case herein principle of the present utility model and mode of execution are set forth, above embodiment's explanation is just for helping to understand method of the present utility model and core concept thereof; , for one of ordinary skill in the art, according to thought of the present utility model, all will change in specific embodiments and applications, in sum, this description should not be construed as restriction of the present utility model simultaneously.
Claims (10)
1. an EGR air mixing device, comprise EGR inlet tube and venturi mixer, and described venturi mixer comprises: contraction section, aditus laryngis section, diffuser; It is characterized in that, described diffuser is provided with interface, and described EGR inlet tube is communicated with described diffuser interface; Described aditus laryngis section and described contraction section are structure as a whole, and described aditus laryngis section embeds in described diffuser interface, at the interlocking position, leave along the circumferential annulus of described aditus laryngis section, and described annulus and described aditus laryngis section axis are angled; Described contraction section and described diffuser are tightly connected at described diffuser jointing.
2. EGR air mixing device according to claim 1, the scope of described annulus and described aditus laryngis section axis angulation is 30 °～60 °.
3. EGR air mixing device according to claim 1 and 2, is characterized in that, described contraction section is connected by flange seal with described diffuser interface.
4. EGR air mixing device according to claim 1 and 2, is characterized in that, described contraction section and described diffuser interface adopt welding manner to be tightly connected.
5. the fuel engine with egr system, comprise the EGR air mixing device, it is characterized in that, described EGR air mixing device comprises venturi mixer and EGR inlet tube, and described venturi mixer comprises: contraction section, aditus laryngis section, diffuser; Described diffuser is provided with interface, and described EGR inlet tube is communicated with described diffuser interface; Described aditus laryngis section and described diffuser are structure as a whole, and described aditus laryngis section embeds in described diffuser interface, at the interlocking position, leave along the circumferential annulus of described aditus laryngis section, and described annulus and described aditus laryngis section axis are angled; Described contraction section and described diffuser are tightly connected at described diffuser jointing.
6. the fuel engine with egr system according to claim 5, is characterized in that, the scope of described annulus and described aditus laryngis section axis angulation is 30 °～60 °.
7. according to the described fuel engine with egr system of claim 5 or 6, it is characterized in that, described contraction section is connected by flange seal with described diffuser interface.
8. according to the described fuel engine with egr system of claim 5 or 6, it is characterized in that, described contraction section and described diffuser interface adopt welding manner to be tightly connected.
9. according to the described fuel engine with egr system of claim 5 or 6, it is characterized in that, also comprise: turbosupercharger, intercooler, cooler for recycled exhaust gas, EGR valve; The gas part that motor is discharged enters the turbo machine of turbosupercharger; A part enters the diffuser of venturi mixer through cooler for recycled exhaust gas and EGR valve through the EGR inlet tube, with the gas compressor through turbosupercharger, fresh air or the mixed gas of intercooler, mix, and flows to motor.
10. the fuel engine with egr system according to claim 9, is characterized in that, described fuel engine is diesel engine.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013203124929U CN203335281U (en) | 2013-05-31 | 2013-05-31 | EGR air mixing device and fuel oil engine with EGR system |
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| CN2013203124929U CN203335281U (en) | 2013-05-31 | 2013-05-31 | EGR air mixing device and fuel oil engine with EGR system |
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| CN203335281U true CN203335281U (en) | 2013-12-11 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103306858A (en) * | 2013-05-31 | 2013-09-18 | 潍柴动力股份有限公司 | EGR (exhaust gas recirculation) air mixing device and fuel engine with EGR system |
| CN107191295A (en) * | 2017-07-10 | 2017-09-22 | 河南柴油机重工有限责任公司 | A kind of diesel engine EGR exhaust blender |
| CN108266280A (en) * | 2018-03-07 | 2018-07-10 | 吉林大学 | A kind of EGR rate self-checking device of engine transient loading procedure |
-
2013
- 2013-05-31 CN CN2013203124929U patent/CN203335281U/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103306858A (en) * | 2013-05-31 | 2013-09-18 | 潍柴动力股份有限公司 | EGR (exhaust gas recirculation) air mixing device and fuel engine with EGR system |
| CN103306858B (en) * | 2013-05-31 | 2016-09-07 | 潍柴动力股份有限公司 | EGR air mixing device and the fuel engines of band egr system |
| CN107191295A (en) * | 2017-07-10 | 2017-09-22 | 河南柴油机重工有限责任公司 | A kind of diesel engine EGR exhaust blender |
| CN108266280A (en) * | 2018-03-07 | 2018-07-10 | 吉林大学 | A kind of EGR rate self-checking device of engine transient loading procedure |
| CN108266280B (en) * | 2018-03-07 | 2023-12-01 | 吉林大学 | EGR rate automatic regulating apparatus of diesel engine transient loading process |
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Granted publication date: 20131211 |