CN205025645U - Engine EGR (Exhaust gas recirculation) system - Google Patents
Engine EGR (Exhaust gas recirculation) system Download PDFInfo
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- CN205025645U CN205025645U CN201520757249.7U CN201520757249U CN205025645U CN 205025645 U CN205025645 U CN 205025645U CN 201520757249 U CN201520757249 U CN 201520757249U CN 205025645 U CN205025645 U CN 205025645U
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- engine
- pipeline section
- inlet union
- egr system
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Abstract
The utility model discloses an engine EGR (Exhaust gas recirculation) system, including being used for carrying out the refrigerated cooler to recycling waste gas, the cooler is equipped with and is used for the but inlet of liquid stream income of cooling, and this system includes still that one is used for controlling access to coolant flow's pneumatic valve in the inlet, through setting up the pneumatic valve, can control access to coolant flow in the inlet through the aperture of controlling pneumatic valve to the heat transfer total amount of recycling waste gas and coolant liquid in can changing the cooler under the unchangeable circumstances of the recycling waste gas velocity of flow is convenient for control the chilling temperature of waste gas, does benefit to control burning accurately, reduces harmful gas's emission.
Description
Technical field
The utility model relates to automotive engine applications, particularly a kind of engine EGR system.
Background technique
Gas recirculation system (ExhaustGasRecirculation) is called for short egr system, and this system sends the sub-fraction of the waste gas that diesel engine or petrol engine produce back to cylinder again; EGR gas will retarded combustion process owing to having inertia, and that is velocity of combustion will slow down thus cause the pressure initiation process in firing chamber to slow down, and oxynitrides is reduced; In addition, improve ER EGR Rate and total exhaust gas flow can be made to reduce, therefore total in toxic emission pollutant output quantity will reduce relatively; EGR gas temperature is very high, and gas recirculation system requires that the EGR gas entered is in proper temperature, and too high exhaust gas temperature also can increase the discharge of harmful gas, therefore just needs EGR gas to cool; But, cooling liquid for cooled exhaust air is in constant speed recurrent state, so just can only control to enter the exhausted air quantity of firing chamber by the aperture of electromagnetic valve mortor operated valve, thus control the chilling temperature of waste gas, this structure is unfavorable for accurately control combustion, adds the discharge amount of harmful gas.
Therefore, just need a kind of engine EGR system, be convenient to the chilling temperature controlling waste gas, be beneficial to accurately control combustion, reduce the discharge amount of harmful gas.
Model utility content
In view of this, the purpose of this utility model is to provide a kind of engine EGR system, is convenient to the chilling temperature controlling waste gas, is beneficial to accurately control combustion, reduce the discharge amount of harmful gas.
Engine EGR system of the present utility model, comprise the cooler for cooling EGR gas, described cooler is provided with the liquid entering hole for flowing into for cooling liquid, and this system also comprises one for controlling to enter the pneumatic valve of coolant rate in described liquid entering hole.
Further, described pneumatic valve is driven by engine vacuum pump.
Further, this system also comprises a vacuum tank, and the suction tude of described vacuum tank is connected with pneumatic valve, and the steam outlet pipe of described vacuum tank is connected with engine vacuum pump.
Further, this system also comprises one and is connected the air intake branch communicated with suction tude, engine vacuum pump by vacuum tank and air intake branch for engine system provides power source.
Further, this system also comprises one for cooled EGR gas being imported the air pipe of intake manifold, described air pipe comprises the first pipeline section for being connected with EGR outlet side, for the second pipeline section of being connected with intake manifold inlet end and the 3rd pipeline section for connecting the first pipeline section and the second pipeline section, described 3rd pipeline section is flexible pipe.
Further, the air outlet of described second pipeline section is connected with an inlet union, and the sidewall of described inlet union is distributed with air hole.
Further, long-pendingly along the longitudinal section of inlet union described in airflow direction to reduce gradually.
Further, described inlet union is round table-like, and the tapering of described inlet union is 1:(1.5 ~ 2.0).
Further, reduce gradually along the aperture of air hole described in airflow direction; And the axis of described air hole and the axis perpendicular of inlet union, the angle of the axis of air hole and the bus of inlet union is 10 ° ~ 20 °.
Further, the surface area sum of each described air hole is 1:(3.0 ~ 4.0 with the ratio of the external surface area of inlet union).
The beneficial effects of the utility model: engine EGR system of the present utility model, by setting up pneumatic valve, can control to enter coolant rate in liquid entering hole by the aperture controlling pneumatic valve, thus the heat exchange total amount of EGR gas and cooling liquid in cooler can be changed when EGR gas flow velocity is constant, be convenient to the chilling temperature controlling waste gas, be beneficial to accurately control combustion, reduce the discharge amount of harmful gas.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the utility model is further described:
Fig. 1 is structural representation of the present utility model;
Fig. 2 is the structural representation of air pipe of the present utility model;
Fig. 3 is A-A sectional view in Fig. 2;
Fig. 4 is the unfolded drawing of inlet union of the present utility model.
Embodiment
Fig. 1 is structural representation of the present utility model, Fig. 2 is the structural representation of air pipe of the present utility model, Fig. 3 is A-A sectional view in Fig. 2, Fig. 4 is the unfolded drawing of inlet union of the present utility model, as shown in the figure: the engine EGR system of the present embodiment, comprise the cooler 1 for cooling EGR gas, described cooler 1 is provided with the liquid entering hole (not shown) for flowing into for cooling liquid, and this system also comprises one for controlling to enter the pneumatic valve 2 of coolant rate in described liquid entering hole; Cooler 1 is a part for engine EGR system, and other parts are consistent with prior art, do not repeat them here; EGR gas flows into cooler 1 and carries out exchange heat with cooling liquid, to reach the object of cooling; Pneumatic valve 2 by engine vacuum pump direct controlling and driving, can certainly adopt other control mode; By setting up pneumatic valve 2, can control to enter coolant rate in liquid entering hole by the aperture controlling pneumatic valve 2, thus the heat exchange total amount of EGR gas and cooling liquid in cooler 1 can be changed when EGR gas flow velocity is constant, be convenient to the chilling temperature controlling waste gas, be beneficial to accurately control combustion, reduce the discharge amount of harmful gas.
In the present embodiment, this system also comprises a vacuum tank 3, and the suction tude of described vacuum tank 3 is connected with pneumatic valve 2, and the steam outlet pipe 4 of described vacuum tank 3 is connected with engine vacuum pump; Vacuum tank 3 obtains vacuum power from engine vacuum pump, thus control the aperture of pneumatic valve 2, to make full use of the existing parts of motor, make engine structure more compact, be convenient to arrange, be suitable for mini engine to use, and be convenient to transform on the basis of available engine mechanism, save reforming cost.
In the present embodiment, this system also comprises one and is connected the air intake branch 53 communicated with suction tude, engine vacuum pump by vacuum tank 3 and air intake branch 53 for engine system provides power source; Suction tude can comprise pipe I 51 and pipe II 52, and described pipe I 51 is connected with vacuum tank 3, and described pipe II 52 is connected with pneumatic valve 2, described pipe I 51, is connected by threeway 54 between pipe II 52 and air intake branch 53; Adopt this structure, vacuum tank 3 obtains vacuum power from engine vacuum pump, and be divided into two-way to export vacuum power, wherein a road controls pneumatic valve 2 aperture, another Lu Zewei motor other system (referring to the system except engine EGR system) provides power source, thus utilizes the existing parts of motor more fully, is more suitable for mini engine and uses, make engine structure more compact, be convenient to arrange; In addition, based on same principle, steam outlet pipe can also be set up many and be in charge of.
In the present embodiment, this system also comprises one for cooled EGR gas being imported the air pipe 6 of intake manifold 9, described air pipe 6 comprises the first pipeline section 61 for being connected with EGR outlet side, for the second pipeline section 62 of being connected with intake manifold 9 inlet end and the 3rd pipeline section 63 for connecting the first pipeline section 61 and the second pipeline section 62, described 3rd pipeline section 63 is flexible pipe, first pipeline section 61 and the second pipeline section 62 are rigid elbow, its bending direction and angle can be decided according to the actual requirements, can effectively derive and import EGR gas, attachment portion i.e. the 3rd pipeline section 63 of the first pipeline section 61 and the second pipeline section 62 can be corrugated flexible hoses, corrugated flexible hoses can be carried out irregular turning and be stretched, air pipe 6 entirety is made to have certain deformation effect, and absorb the thermal distortion of air pipe 6, air pipe 6 entirety flexible arrangement in the narrow mini engine in space can be made, and demand is arranged in the space that can adapt to different motor, improve versatility, first pipeline section 61, second pipeline section 62 and the 3rd pipeline section 63 all adopt metal to make, and stainless steel such as can be adopted to make, and make each parts have higher bending fatigue strength and corrosion resistance, welding performance is good, first pipeline section 61, second pipeline section 62 is connected by welding manner successively with between the 3rd pipeline section 63, is connected firmly, and is convenient to batch process and produces.
In the present embodiment, the air outlet of described second pipeline section 62 is connected with an inlet union 7, and the sidewall of described inlet union 7 is distributed with air hole 7a; During use, inlet union 7 is goed deep in engine intake manifold 9, and air hole 7a is conducive to the Homogeneous phase mixing of waste gas and fresh air; Inlet union 7 can adopt sheet metal to be welded, and adopts welding manner to be connected to the second pipeline section 62; The suction port of described first pipeline section 61 is provided with the first adpting flange 81 for being connected with EGR parts, and described second pipeline section 62 is provided with the second adpting flange 82 for being connected with intake manifold 9; EGR parts and intake manifold 9 are respectively equipped with the linkage structure corresponding with the first adpting flange 81 and the second adpting flange 82, ensure that mounting point is accurate, and be not easy to get loose.
In the present embodiment, the longitudinal section along inlet union described in airflow direction 7 is long-pending to be reduced gradually; This convergence structure is conducive to improving waste gas flow velocity, promotes the mixing of waste gas and fresh air; Preferably, described inlet union 7 is in round table-like, and the tapering of described inlet union 7 can be 1:(1.5 ~ 2.0), being preferably 1.82, the optimum performance of inlet union 7 can be played through testing this tapering.
In the present embodiment, reduce gradually along the aperture of air hole 7a described in airflow direction, ensure that air hole 7a's offers inlet union 7 structural strength that can not weaken; And the axis of described air hole 7a and the axis perpendicular of inlet union 7, the angle of the axis of air hole 7a and the bus of inlet union 7 can be 10 ° ~ 20 °, is preferably 15 °, can improve the mixed effect of waste gas and the fresh air flowed out from air hole 7a; Each surface area sum of described air hole 7a is 1:(3.0 ~ 4.0 with the ratio of the external surface area of inlet union 7), be preferably 1:3.38, the structural strength of inlet union 7 can be kept while reaching better mixed effect.
What finally illustrate is, above embodiment is only in order to illustrate the technical solution of the utility model and unrestricted, although be described in detail the utility model with reference to preferred embodiment, those of ordinary skill in the art is to be understood that, can modify to the technical solution of the utility model or equivalent replacement, and not departing from aim and the scope of technical solutions of the utility model, it all should be encompassed in the middle of right of the present utility model.
Claims (10)
1. an engine EGR system, comprise the cooler for cooling EGR gas, described cooler is provided with the liquid entering hole for flowing into for cooling liquid, it is characterized in that: this system also comprises one for controlling to enter the pneumatic valve of coolant rate in described liquid entering hole.
2. engine EGR system according to claim 1, is characterized in that: described pneumatic valve is driven by engine vacuum pump.
3. engine EGR system according to claim 1, it is characterized in that: this system also comprises a vacuum tank, the suction tude of described vacuum tank is connected with pneumatic valve, and the steam outlet pipe of described vacuum tank is connected with engine vacuum pump.
4. engine EGR system according to claim 3, is characterized in that: this system also comprises one and is connected the air intake branch communicated with suction tude, engine vacuum pump by vacuum tank and air intake branch for engine system provides power source.
5. engine EGR system according to claim 1, it is characterized in that: this system also comprises one for cooled EGR gas being imported the air pipe of intake manifold, described air pipe comprises the first pipeline section for being connected with EGR outlet side, for the second pipeline section of being connected with intake manifold inlet end and the 3rd pipeline section for connecting the first pipeline section and the second pipeline section, described 3rd pipeline section is flexible pipe.
6. engine EGR system according to claim 5, is characterized in that: the air outlet of described second pipeline section is connected with an inlet union, and the sidewall of described inlet union is distributed with air hole.
7. engine EGR system according to claim 6, is characterized in that: the longitudinal section along inlet union described in airflow direction is long-pending to be reduced gradually.
8. engine EGR system according to claim 7, is characterized in that: described inlet union is round table-like, and the tapering of described inlet union is 1:(1.5 ~ 2.0).
9. engine EGR system according to claim 8, is characterized in that: reduce gradually along the aperture of air hole described in airflow direction; And the axis of described air hole and the axis perpendicular of inlet union, the angle of the axis of air hole and the bus of inlet union is 10 ° ~ 20 °.
10. engine EGR system according to claim 6, is characterized in that: the surface area sum of each described air hole is 1:(3.0 ~ 4.0 with the ratio of the external surface area of inlet union).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520757249.7U CN205025645U (en) | 2015-09-24 | 2015-09-24 | Engine EGR (Exhaust gas recirculation) system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520757249.7U CN205025645U (en) | 2015-09-24 | 2015-09-24 | Engine EGR (Exhaust gas recirculation) system |
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| Publication Number | Publication Date |
|---|---|
| CN205025645U true CN205025645U (en) | 2016-02-10 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201520757249.7U Active CN205025645U (en) | 2015-09-24 | 2015-09-24 | Engine EGR (Exhaust gas recirculation) system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114458851A (en) * | 2022-01-13 | 2022-05-10 | 宁波福士汽车部件有限公司 | Structure for controlling flow of cooling water pipe of engine |
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2015
- 2015-09-24 CN CN201520757249.7U patent/CN205025645U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114458851A (en) * | 2022-01-13 | 2022-05-10 | 宁波福士汽车部件有限公司 | Structure for controlling flow of cooling water pipe of engine |
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