CN205013150U - A special EGR system for diesel engine - Google Patents
A special EGR system for diesel engine Download PDFInfo
- Publication number
- CN205013150U CN205013150U CN201520675831.9U CN201520675831U CN205013150U CN 205013150 U CN205013150 U CN 205013150U CN 201520675831 U CN201520675831 U CN 201520675831U CN 205013150 U CN205013150 U CN 205013150U
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- Prior art keywords
- egr
- regulating valve
- air outlet
- diesel engine
- exhaust manifold
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- 230000001105 regulatory effect Effects 0.000 claims description 38
- 206010022000 influenza Diseases 0.000 claims description 9
- 230000001276 controlling effect Effects 0.000 claims description 6
- 230000006837 decompression Effects 0.000 claims description 5
- 239000002912 waste gas Substances 0.000 abstract description 11
- 238000009510 drug design Methods 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 37
- 238000000034 method Methods 0.000 description 4
- 238000005457 optimization Methods 0.000 description 4
- 238000005086 pumping Methods 0.000 description 4
- 240000000736 Amomum maximum Species 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000001473 noxious effect Effects 0.000 description 1
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- Exhaust-Gas Circulating Devices (AREA)
Abstract
The utility model discloses a special EGR system for diesel engine, including engine cylinder block, the last exhaust manifold that installs of engine cylinder block, exhaust manifold pass through a plurality of exhaust passage and engine cylinder block intercommunication, through the connecting pipe intercommunication between a plurality of exhaust passage, a N exhaust passage is d2 with the pipe diameter of being connected between the N+1 exhaust passage, and connection pipe diameter between other exhaust passages is d1, D2=0.1-0.5d1, 1 <= N <= M2, N are the integer, M is total for engine cylinder. At the during operation, because it is less to connect pipe diameter d2 department area, so produce higher pressure in the N of the exhaust manifold one end cylinder, this pressure is greater than pressure behind the compressor, and partial waste gas gets into air intake manifold and forms the EGR circulation, and all the other waste gas are through turbo charger acting, and according to actual conditions rational design d2's diameter, assurance waste gas rational distribution satisfies the requirement that EGR is rateed under each operating mode.
Description
Technical field
The utility model patent relates to a kind of for the special egr system of diesel engine, and a kind of passage sub-cylinder carries out waste gas circulation to the special egr system of the diesel engine meeting engine emission requirements specifically, belongs to field of internal combustion engine.
Background technique
Along with the significance of environmental protection problem increases increasingly; reduce the important directions that this target of Engine's Harmful Emission becomes development of engine in the world today; so the controlling method of research Harmful Emissions of Diesel Engine; the top priority of the person that becomes Design Technology for Diesels, and to reduce the most frequently used in the control technique of noxious emission be exactly gas recirculation system (egr system).
Research at present about egr system is divided into following several substantially:
A. Maximum differential pressure circulation, namely EGR waste gas is drawn before turbo machine, introduces before gas compressor;
B. cycle of higher pressure, namely EGR waste gas is drawn before turbo machine, introduces after gas compressor;
C. low pressure recycle, namely EGR waste gas is drawn after turbo machine, introduces before gas compressor.
The necessary condition that conventional high-tension egr system realizes circulation is that before turbo machine, pressure is greater than pressure after gas compressor, and this system exists two shortcomings:
One, needs to use VGT pressurized machine, and it is not only expensive but also reliability is poor;
Its two, cylinder pressure raises, intake and exhaust pressure reduction increases, and cause pumping work loss to be strengthened, the economic index of motor worsens.
Certain company domestic has applied for a kind of patent that motor can be made in all operating modes to realize the cycle of higher pressure egr system of constant external EGR rate, its publication No. is CN102207046A, there is a shortcoming in this system: a large amount of academic documents has proved that different engine operating conditions is different to the demand of EGR rate, there is a best EGR rate in each engine operating condition, this egr system can only realize constant EGR rate under each operating mode, and engine performance is poor.
Henan university has applied for the patent of the adjustable EGR high-pressure recycle system of a kind of binary channel, its publication No. is CN103807057A, there is a shortcoming in this system: when carrying out EGR rate and regulating, portion is directly got rid of without turbo machine, the utilization ratio of exhaust energy is lower, and then affects the air inlet of motor.
Therefore wish that a kind of structure of design is simple, cost is low, reliability is high, the gas recirculation system of accuracy controlling EGR rate can solve above-mentioned egr system Problems existing, meet the performance requirement under each operating mode of motor.
Model utility content
The technical problems to be solved in the utility model is reliable for egr system, accurate regulatory demand, provides one for diesel engine and can realize motor full working scope EGR rate to regulate accurate special egr system.
In order to solve the problem, the utility model adopts following technological scheme:
For a special egr system for diesel engine, comprise engine cylinder-body, described engine cylinder-body is provided with gas exhaust manifold, gas exhaust manifold is communicated with engine cylinder-body by several air outlet flues, is communicated with between several air outlet flues by connecting tube;
Connection caliber between N number of air outlet flue and N+1 air outlet flue is d2, and the connection caliber between other air outlet flue is d1, described d2=0.1 ~ 0.5d1, and described 1≤N≤M/2, N is integer, M is cylinder sum.
The utility model adopts such scheme, operationally, because it is less to connect caliber d2 place area, so produce higher pressure in N number of cylinder of gas exhaust manifold one end, this pressure is greater than pressure after gas compressor, and portion enters intake manifold and forms EGR circulation, all the other waste gas do work through turbosupercharger, according to the diameter of actual conditions appropriate design d2, ensure waste gas reasonable distribution, meet the requirement of EGR rate under each operating mode.Meanwhile, the pressure of other each cylinder is relatively low, reduces pumping work loss, reduces the oil consumption of motor.
Below the further optimization of the utility model to such scheme:
Connecting tube between the N number of air outlet flue of described gas exhaust manifold and N+1 air outlet flue is designed with decompression chamber, and and connecting tube center between other air outlet flues stagger.
It is in order to avoid the gas blowby between high pressure cylinder and low-pressure cylinder that gas exhaust manifold arranges decompression chamber, reduces the impact that Pulse wave brings.
Another kind of optimization:
Described gas exhaust manifold is provided with cooler for recycled exhaust gas and turbosupercharger, described cooler for recycled exhaust gas is connected with intake manifold with gas exhaust manifold simultaneously.
The joint of gas exhaust manifold and cooler for recycled exhaust gas is provided with EGR regulating valve.When EGR regulating valve is closed, EGR rate is zero, and when EGR regulating valve standard-sized sheet, EGR rate is less than 25%.
Another kind of optimization:
Connecting tube between N number of air outlet flue and N+1 air outlet flue is provided with EGR regulating valve.When EGR regulating valve is closed, EGR rate is 25%, and when EGR regulating valve standard-sized sheet, EGR rate is greater than zero.
Another kind of optimization:
The joint of first air outlet flue be communicated with cooler for recycled exhaust gas is provided with axle sleeve and regulating valve, and described regulating valve is connected with driver blade, and described driver blade promotes acting by final controlling element.
The sectional shape of described regulating valve is sector structure.Its cross section angle carries out appropriate design according to the caliber of gas exhaust manifold, the scope of angle 40 ~ 120 °, and when regulating valve is closed at high order end, EGR rate is zero, and when regulating valve is at low order end standard-sized sheet, EGR rate is 25%.
The utility model not only can realize the accuracy controlling of EGR rate under each operating mode of motor, and only have partial cylinders to produce high pressure, reduce intake and exhaust pressure reduction and reduce pumping work loss, avoid again using VGT pressurized machine simultaneously, reduce the cost of motor, add the reliability of motor.This egr system structure is simple, cost is low, easy realization, have wide market popularization value, can obtain good effect.
Below in conjunction with drawings and Examples, the utility model is described in further detail.
Accompanying drawing explanation
Accompanying drawing 1 is the structural representation of the special egr system of diesel engine in the utility model embodiment 1;
Accompanying drawing 2 is plan views of the utility model embodiment 2;
Accompanying drawing 3 is structural representations of the utility model embodiment 3;
Accompanying drawing 4 is structural representations of the utility model embodiment 4;
Accompanying drawing 5 is plan views of the utility model embodiment 5.
In figure: 1-EGR cooler; 2-engine cylinder-body; 3-intake manifold; 4-gas exhaust manifold; 5-turbosupercharger; 6-driver blade; 7-axle sleeve; 8-regulating valve; 9-EGR regulating valve; 10-decompression chamber; 11-air outlet flue.
Embodiment
Embodiment 1: as shown in Figure 1, a kind of special egr system for diesel engine, comprise engine cylinder-body 2, described engine cylinder-body 2 is provided with intake manifold 3 and gas exhaust manifold 4, described gas exhaust manifold 4 is provided with cooler for recycled exhaust gas 1 and turbosupercharger 5, described cooler for recycled exhaust gas 1 is connected with intake manifold 3 simultaneously.
Gas exhaust manifold 4 is communicated with engine cylinder-body 2 by several air outlet flues 11, be communicated with by connecting tube between several air outlet flues 11, wherein, connection caliber between N number of air outlet flue and N+1 air outlet flue is d2, connection caliber between other air outlet flue is d1, described d2=0.1 ~ 0.5d1, described 1≤N≤M/2, N are integer, M is cylinder sum.
Connecting tube between the N number of air outlet flue of described gas exhaust manifold 4 and N+1 air outlet flue is designed with decompression chamber 10, and and connecting tube center between other air outlet flues stagger.
Operationally, because it is less to connect caliber d2 place area, so produce higher pressure in N number of cylinder of gas exhaust manifold one end, this pressure is greater than pressure after gas compressor, portion enters intake manifold and forms EGR circulation, and all the other waste gas do work through turbosupercharger, according to the diameter of actual conditions appropriate design d2, ensure waste gas reasonable distribution, meet the requirement of EGR rate under each operating mode.
Meanwhile, the pressure of other each cylinder is relatively low, reduces pumping work loss, reduces the oil consumption of motor.Gas exhaust manifold arranges decompression chamber, is in order to avoid the gas blowby between high pressure cylinder and low-pressure cylinder, reduces the impact that Pulse wave brings.
Embodiment 2: as shown in Figure 2, and embodiment 1 basis increases EGR regulating valve 9, and mounting point is in gas exhaust manifold 4 and cooler for recycled exhaust gas 1 joint.
Operationally, realize the accurate control to EGR rate according to the aperture of the actual conditions timely adjustment EGR regulating valve 9 of motor, when EGR regulating valve 9 is closed, EGR rate is zero, and when EGR regulating valve 9 standard-sized sheet, EGR rate is less than 25%.
Embodiment 3: as shown in Figure 3, and embodiment 1 basis increases EGR regulating valve 9, N number of air outlet flue of mounting point gas exhaust manifold 4 one end and the joint of N+1 air outlet flue.
Operationally, realize the accurate control to EGR rate according to the aperture of the actual conditions timely adjustment EGR regulating valve 9 of motor, when EGR regulating valve 9 is closed, EGR rate is 25%, and when EGR regulating valve 9 standard-sized sheet, EGR rate is greater than zero.
Embodiment 4: as shown in Figure 4,5, this embodiment is applicable to four cylinder engine, in the joint of gas exhaust manifold 4 the 1st air outlet flue, axle sleeve 7 and regulating valve 8 are installed, the sectional shape of described regulating valve 8 is sector structure, its cross section angle a carries out appropriate design according to the caliber of gas exhaust manifold, the scope of angle is 40 ~ 120 °, and is connected with driver blade 6, and described driver blade 6 promotes acting by final controlling element.
Operationally, according to the aperture of the actual conditions timely adjustment regulating valve 8 of motor, realize the accurate control to EGR rate, when regulating valve 8 EGR rate when high order end is closed is zero, when regulating valve 8 is at low order end standard-sized sheet, EGR rate is 25%.
We have been described in detail model utility according to national patent method now, can identify improvement or the replacement of specific embodiment disclosed herein for those skilled in the art.These amendments are in spirit and scope of the present utility model.
Claims (10)
1. the special egr system for diesel engine, comprise engine cylinder-body (2), described engine cylinder-body (2) is provided with gas exhaust manifold (4), gas exhaust manifold (4) is communicated with engine cylinder-body (2) by several air outlet flues (11), several air outlet flues are communicated with by connecting tube between (11), it is characterized in that:
Connection caliber between N number of air outlet flue and N+1 air outlet flue is d2, and the connection caliber between other air outlet flue is d1, described d2=0.1 ~ 0.5d1, and described 1≤N≤M/2, N is integer, M is cylinder sum.
2. a kind of special egr system for diesel engine according to claim 1, is characterized in that:
Connecting tube between the N number of air outlet flue of described gas exhaust manifold (4) and N+1 air outlet flue is provided with decompression chamber (10), and and connecting tube center between other air outlet flues stagger.
3. a kind of special egr system for diesel engine according to claim 1, is characterized in that:
Described gas exhaust manifold (4) is provided with cooler for recycled exhaust gas (1) and turbosupercharger (5), described cooler for recycled exhaust gas (1) is connected with intake manifold (3) with gas exhaust manifold (4) simultaneously.
4. a kind of special egr system for diesel engine according to claim 3, is characterized in that:
Gas exhaust manifold (4) is provided with EGR regulating valve (9) with the joint of cooler for recycled exhaust gas (1).
5. a kind of special egr system for diesel engine according to claim 4, is characterized in that:
When EGR regulating valve (9) is closed, EGR rate is zero, and when EGR regulating valve (9) standard-sized sheet, EGR rate is less than 25%.
6. a kind of special egr system for diesel engine according to claim 3, is characterized in that: the connecting tube between N number of air outlet flue and N+1 air outlet flue is provided with EGR regulating valve (9).
7. a kind of special egr system for diesel engine according to claim 6, is characterized in that:
When EGR regulating valve (9) is closed, EGR rate is 25%, and when EGR regulating valve (9) standard-sized sheet, EGR rate is greater than zero.
8. a kind of special egr system for diesel engine according to claim 3, is characterized in that:
The joint of first air outlet flue be communicated with cooler for recycled exhaust gas (1) is provided with axle sleeve (7) and regulating valve (8), and described regulating valve (8) is connected with driver blade (6), and described driver blade (6) promotes acting by final controlling element.
9. a kind of special egr system for diesel engine according to claim 8, is characterized in that:
The sectional shape of described regulating valve (8) is sector structure.
10. a kind of special egr system for diesel engine according to claim 9, is characterized in that:
When regulating valve (8) is closed at high order end, EGR rate is zero, and when regulating valve (8) is at low order end standard-sized sheet, EGR rate is 25%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520675831.9U CN205013150U (en) | 2015-09-02 | 2015-09-02 | A special EGR system for diesel engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520675831.9U CN205013150U (en) | 2015-09-02 | 2015-09-02 | A special EGR system for diesel engine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205013150U true CN205013150U (en) | 2016-02-03 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520675831.9U Expired - Fee Related CN205013150U (en) | 2015-09-02 | 2015-09-02 | A special EGR system for diesel engine |
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| Country | Link |
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| CN (1) | CN205013150U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105041513A (en) * | 2015-09-02 | 2015-11-11 | 康跃科技股份有限公司 | Special EGR system for diesel engine |
| CN109488489A (en) * | 2017-09-13 | 2019-03-19 | 康明斯公司 | Thermal exhaust recirculating system |
-
2015
- 2015-09-02 CN CN201520675831.9U patent/CN205013150U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105041513A (en) * | 2015-09-02 | 2015-11-11 | 康跃科技股份有限公司 | Special EGR system for diesel engine |
| CN105041513B (en) * | 2015-09-02 | 2018-02-06 | 康跃科技股份有限公司 | Special egr system for diesel engine |
| CN109488489A (en) * | 2017-09-13 | 2019-03-19 | 康明斯公司 | Thermal exhaust recirculating system |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160203 |