CN107725161B - Exhaust manifold for four-cylinder turbine engine - Google Patents
Exhaust manifold for four-cylinder turbine engine Download PDFInfo
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- CN107725161B CN107725161B CN201711048192.3A CN201711048192A CN107725161B CN 107725161 B CN107725161 B CN 107725161B CN 201711048192 A CN201711048192 A CN 201711048192A CN 107725161 B CN107725161 B CN 107725161B
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- flange
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- exhaust passage
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
- F01N13/08—Other arrangements or adaptations of exhaust conduits
- F01N13/10—Other arrangements or adaptations of exhaust conduits of exhaust manifolds
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Exhaust Silencers (AREA)
Abstract
The invention belongs to the field of engines and discloses an exhaust manifold for a four-cylinder turbine engine.A first flange and a second flange are split, a first notch is formed between the first flange and the second flange, the left side and the right side of the first notch are respectively provided with a notch, and two notches form notch bolt holes; the second flange and the third flange are split, a second notch is formed between the second flange and the third flange, and the second flange and the third flange are fixed by bolts respectively; the third flange and the fourth flange are integral. The invention can solve the problems of air leakage and cracking of the joints of pipelines.
Description
Technical Field
The invention belongs to the field of engines, and particularly relates to an exhaust manifold for a four-cylinder turbine engine.
Background
An exhaust manifold is connected to the engine block for collecting exhaust gases from the cylinders for introduction into an exhaust manifold, with diverging passages.
Exhaust manifolds are used in extremely harsh high temperature environments, and the exhaust manifolds are subject to failure due to severe conditions during operation, such as frequent high temperature airflow impingement. The failure modes mainly include exhaust manifold cracking, air leakage at the joint of an exhaust manifold flange and a cylinder cover and the like. The main reason for the cracking of the exhaust manifold is that internal stress is generated among all pipelines during working, and the main reason for air leakage is that the flange plate deforms.
The design of the flange plate of the existing exhaust manifold is mainly integral type and split type. The integral flange plate is characterized in that flange plates of 4 cylinders are cast into a whole, and the flange plates are connected with a cylinder cover through bolts. The split type flange plate means that the flange plate of each exhaust passage is independent and is respectively connected with the cylinder cover through bolts.
The integral flange plate is not easy to generate thermal deformation due to mutual support of all parts, namely, the connection rigidity is high, so that the risk of air leakage of the flange plate is low. However, when the exhaust manifold operates at high temperature, the joints of the pipes are prone to generate large thermal stress, and the joints of the pipes are prone to generate a penetrating cracking phenomenon. The split type flange plate can avoid the problems, but the flange is easy to seriously deform under the long condition of the exhaust manifold pipeline, so that the air leakage phenomenon of the exhaust manifold is caused.
How to solve the problems of cracking and air leakage simultaneously is crucial, which has become a technical problem.
Disclosure of Invention
The invention aims to provide an exhaust manifold for a four-cylinder turbocharged engine, which solves the problems of air leakage and cracking of joints of pipelines.
In order to achieve the technical purpose, the invention adopts the following scheme:
an exhaust manifold for a four-cylinder turbocharged engine comprises four exhaust passages, four inlet flange plates connected to inlets of the exhaust passages and an outlet flange plate connected to an outlet of the exhaust passages, wherein the exhaust passages, the inlet flange plates and the outlet flange plates are integrally formed; the inlet flange connected with the first exhaust passage is a first flange, the inlet flange connected with the second exhaust passage is a second flange, the inlet flange connected with the third exhaust passage is a third flange, and the inlet flange connected with the fourth exhaust passage is a fourth flange; the position where the four exhaust passages are converged is positioned between the third exhaust passage and the fourth exhaust passage; the first flange and the second flange are split, a first notch is formed between the first flange and the second flange, a notch is formed in the position, close to the first notch, of each of the first flange and the second flange, and a notch bolt hole is formed in each of the two notches; the second flange and the third flange are split, a second notch is formed between the second flange and the third flange, and the second flange and the third flange are fixed by bolts respectively; the third flange and the fourth flange are integrated.
And a joint of the third flange and the fourth flange is provided with a shared bolt hole, and a joint of the third flange and the fourth flange is provided with a special-shaped groove for releasing internal stress.
A balance point is arranged between the first flange and the second flange, the first notch is linear, one end of the first notch passes through the notch bolt hole, and the other end of the first notch passes through the balance point.
And a tool withdrawal groove used for processing the upper surface of the bolt hole is formed on the upper surface of the inlet flange plate.
The invention has the beneficial effects that:
(1) the flange plate reasonably combines a split structure and an integral structure by combining the structure of the exhaust manifold and the deformation condition of each exhaust passage subjected to cold and hot impact during working, and three different connection modes are adopted between the flanges by combining the mode of sharing the bolts, so that the problems of air leakage and cracking of the joints of the exhaust passages are effectively solved;
(2) the special-shaped groove is designed at the connecting position of the integral flange plate, so that the internal stress can be released to the maximum extent on the basis of ensuring the connecting rigidity, and the defects between the third exhaust passage and the fourth exhaust passage are further reduced;
(3) the direction of the cut is reasonably arranged, so that the stress condition of each flange is more reasonable;
(4) by adopting the mode of processing the tool withdrawal groove, the processing precision is improved, the processing difficulty is reduced, and the matching of the joint is tighter and firmer.
Drawings
FIG. 1 is a schematic front view of the present invention;
fig. 2 is a bottom view of fig. 1.
The reference numerals in the drawings denote: 1-a first exhaust passage, 2-a second exhaust passage; 3-third exhaust passage, 4-fourth exhaust passage, 5-first ribbed plate, 6-second ribbed plate, 7-third ribbed plate, 8-first flange, 9-second flange, 10-third flange, 11-fourth flange, 12-first bolt hole, 13-second bolt hole, 14-third bolt hole, 15-fourth bolt hole, 16-notch bolt hole, 17-common bolt hole, 18-first notch, 19-second notch, 20-special-shaped groove, 21-tool withdrawal groove and 22-balance point.
Detailed Description
In order that those skilled in the art can better understand the present invention, the following technical solutions are further described with reference to the accompanying drawings and examples.
Example 1
As shown in fig. 1 and 2, an exhaust manifold for a four-cylinder turbocharged engine comprises four exhaust passages, four inlet flanges connected to inlets of the exhaust passages, and an outlet flange connected to an outlet of the exhaust passages, wherein the exhaust passages, the inlet flanges and the outlet flanges are integrally formed, the four exhaust passages are a first exhaust passage 1, a second exhaust passage 2, a third exhaust passage 3 and a fourth exhaust passage 4 in sequence, and the exhaust passages are connected by rib plates; an inlet flange plate connected with the first exhaust passage 1 is a first flange 8, an inlet flange plate connected with the second exhaust passage 2 is a second flange 9, an inlet flange plate connected with the third exhaust passage 3 is a third flange 10, and an inlet flange plate connected with the fourth exhaust passage 4 is a fourth flange 11; the position where the four exhaust passages are converged is positioned between the third exhaust passage 3 and the fourth exhaust passage 4; the first flange 8 and the second flange 9 are split, a first notch 18 is formed between the first flange 8 and the second flange 9, a notch is formed in the positions, close to the first notch 18, of the first flange 8 and the second flange 9, and a notch bolt hole 16 is formed in the two notches; the second flange 9 and the third flange 10 are split, a second notch 19 is formed between the second flange 9 and the third flange 10, and the second flange 9 and the third flange 10 are fixed by bolts respectively; the third flange 10 is integral with the fourth flange 11.
The integral type means that the third flange and the fourth flange are directly connected into a flange plate, and the split type means that the third flange and the fourth flange are not directly connected.
The invention combines the integral type and the split type, and due to the design of the notch bolt holes 16, after the fixing, the first flange 8 and the second flange 9 are in the split type design, but share one bolt for fixing.
Due to the arrangement characteristics of the four exhaust passages, as shown in fig. 1, the length of the first exhaust passage 1 is longest, the length of the second exhaust passage 2 is shorter, the deformation amount of the first exhaust passage 1 after being heated is largest when an exhaust manifold works, and the first rib plate 5 is easy to crack due to the larger difference of the deformation amounts of the first exhaust passage 1 and the second exhaust passage 2. The second exhaust passage 2 and the third exhaust passage 3 are short in length, the generated deformation is small, the air leakage phenomenon is not easy to generate, the second flange 9 and the third flange 10 are designed to be split, the internal stress is released, and the second rib plate 6 is prevented from cracking. The third port 3 and the fourth port 4 have the highest operating temperature, in which case the risk of deformation of the third flange 10 and the fourth flange 11 is high, as is the risk of cracking of the third ribs 7. Considering that the lengths of the third exhaust passage 3 and the fourth exhaust passage 4 are close to each other, the internal stress is slightly released, so that the design is carried out on the basis of integral type to balance the connection rigidity and prevent the air leakage phenomenon.
A joint of the third flange 10 and the fourth flange 11 is provided with a common bolt hole 17, the common bolt hole 17 is shared by the third flange 10 and the fourth flange 11, and a special-shaped groove 20 for releasing internal stress is arranged at the joint of the third flange 10 and the fourth flange 11.
The profiled groove 20 can release internal stress on the basis of ensuring the connection rigidity. In the embodiment, besides the common bolt hole 17, the third flange 10 is provided with a bolt hole for fixing on each of two sides of the exhaust passage, and the bolt hole which is not on one side of the common bolt hole 17 is called as a third bolt hole 14; the fourth flange 11 is also provided with a bolt hole for fixing on each side of the exhaust passage, wherein the bolt hole on the side different from the common bolt hole 17 is called a fourth bolt hole 15. In order to keep the profile groove 20 as little as possible from affecting the connection stiffness, it should be located outside a tangent of the third bolt hole 14 and the common bolt hole 17 and outside a tangent of the fourth bolt hole 15 and the common bolt hole 17.
The irregular groove 20 can release internal stress on the basis of ensuring the connection rigidity, and the conclusion is obtained through a large number of simulations and tests, and only the irregular groove 20 needs to meet the position, and as for the specific size and shape of the irregular groove 20, on the basis of the theory, the most suitable size and shape can be found through limited tests and analysis according to actual requirements.
There is a balance point 22 between the first flange 8 and the second flange 9, the first slit 18 being rectilinear, and one end of the first slit 18 passing through the slit bolt hole 16 and the other end of the first slit 18 passing through the balance point 22.
In the present embodiment, the notched bolt hole 16 is used together with two bolt holes for fastening the first flange 8, wherein the bolt hole that is not on the same side as the notched bolt hole 17 (with the exhaust duct as a reference) is the first bolt hole 12, and the notched bolt hole 16 is used together with two other bolt holes for fastening the second flange 9, wherein the bolt hole that is not on the same side as the notched bolt hole 16 (with the exhaust duct as a reference) is the second bolt hole 13. The intersection point of the perpendicular bisector of the line connecting the centers of the first bolt hole 12 and the second bolt hole 13 with the inlet flange is the equilibrium point 22. The direction of the cut is determined through the balance point 22 and the cut bolt hole 16, the first flange 8 and the second flange 9 can be reasonably divided, the first flange 8 and the second flange 9 are firmly fixed on the cylinder cover, and the stress of the bolt at the cut bolt hole 17 is more balanced and reasonable.
The width c of the first slit 18 is determined by obtaining the amount of deformation of the exhaust manifold during operation through finite element analysis. Similarly, the width b of the second notch 19 is obtained by finite element analysis, and the second notch 19 is not required to be away from the bolt hole.
The upper surface of the inlet flange plate is provided with a tool withdrawal groove 21 for processing the upper surface of the bolt hole.
After the tool withdrawal groove 21 is formed, the upper surface of the inlet flange plate can be processed to ensure the processing precision of each bolt hole, and the higher precision is more favorable for matching with the upper surface of the inlet flange plate and the bolt head. Meanwhile, after the tool withdrawal groove 21 is arranged, the processing surface of the upper surface of the inlet flange plate becomes small, and finish machining is facilitated.
To demonstrate that designing the profiled groove 20 in the manner of the present invention enables the release of internal stresses on the basis of ensuring the stiffness of the connection, several comparative examples are provided herein.
Example 2: the difference compared to example 1 is only that the size of the profiled groove is smaller than in example 1.
Comparative example 1: compared with the embodiment 1, the difference is only in the arrangement mode between the third flange 10 and the fourth flange 11, and the third flange 10 and the fourth flange 11 are designed to be common integral without irregular grooves.
Comparative example 2: compared with the embodiment 1, the difference is only in the arrangement between the third flange 10 and the fourth flange 11, and the third flange 10 and the fourth flange 11 are designed as a whole and are provided with the special-shaped grooves, but the special-shaped grooves cross the tangents of the third bolt holes 14 and the common bolt holes 17.
Comparative example 3: compared with embodiment 1, the difference is only in the arrangement between the third flange 10 and the fourth flange 11, and the third flange 10 and the fourth flange 11 are designed to be split and share one bolt hole, i.e., the structure thereof is the same as that between the first flange 8 and the second flange 9.
The working conditions of the above examples and comparative examples were analyzed and the following table was obtained:
| scheme(s) | Magnitude of thermal strain (%) | Sealing pressure (MPa) |
| Comparative example 1 | 0.89 | 9.6 |
| Example 2 | 0.57 | 5.8 |
| Example 1 | 0.48 | 5.2 |
| Comparison ofExample 2 | 0.42 | 3.2 |
| Comparative example 3 | 0.25 | 0.9 |
| Standard value in certain exhaust manifold | Less than 0.5 | Greater than 5 |
Wherein, the thermal strain amplitude reflects the fatigue resistance, and the smaller the value is, the better the fatigue resistance is, and the more difficult the cracking is; the sealing pressure refers to the sealing pressure between the flange and the cylinder cover, and the larger the value of the sealing pressure, the less prone to air leakage.
Comparative example 1, which is a common monolithic type, has a large thermal strain amplitude and a high risk of cracking, and has a sealing pressure much higher than a standard value, and has a good sealing effect even if a part of the sealing pressure is reduced.
Comparative example 3 adopts a split type, and the sealing pressure of the split type is far smaller than other schemes and is also far smaller than the qualified standard, which is the reason why the invention firstly ensures the adoption of the integral type.
Example 1, example 2 and comparative example 2 all adopt a mode of integrating and arranging a profiled groove at the joint of the third flange and the fourth flange, and it can be found that the thermal strain amplitude and the sealing pressure of the three schemes avoid the extreme conditions of comparative example 1 and comparative example 3.
Comparing example 1 with comparative example 2, it was found that the sealing pressure changes very significantly, i.e. the profile groove has a significant effect on the sealing pressure beyond the tangent of the third bolt hole 14 to the common bolt hole 17, so that it must be ensured that the profile groove is outside the tangent of the third bolt hole 14 to the common bolt hole 17 in order to ensure the sealing pressure requirement.
Comparing example 2, example 1 and comparative example 2, it can be seen that the variation of the thermal strain amplitude between example 1 and example 2 is relatively large, but the variation of the sealing pressure is small. Namely, the size of the special-shaped groove is adjusted, so that the thermal strain amplitude can be reduced under the condition of basically ensuring that the sealing pressure is unchanged, namely, by utilizing the scheme of the invention, the special-shaped groove can be adjusted through limited tests according to actual requirements, so that the thermal strain amplitude and the sealing pressure reach the optimal values, and the capability of releasing the internal stress and the sealing capability of the special-shaped groove are matched with the standard values.
Claims (3)
1. An exhaust manifold for a four-cylinder turbocharged engine comprises four exhaust passages, four inlet flange plates connected to inlets of the exhaust passages and an outlet flange plate connected to an outlet of the exhaust passages, wherein the exhaust passages, the inlet flange plates and the outlet flange plates are integrally formed, and the four exhaust passages are a first exhaust passage (1), a second exhaust passage (2), a third exhaust passage (3) and a fourth exhaust passage (4) in sequence; an inlet flange plate connected with the first exhaust passage (1) is a first flange (8), an inlet flange plate connected with the second exhaust passage (2) is a second flange (9), an inlet flange plate connected with the third exhaust passage (3) is a third flange (10), and an inlet flange plate connected with the fourth exhaust passage (4) is a fourth flange (11);
the method is characterized in that: the position where the four exhaust passages are converged is positioned between the third exhaust passage (3) and the fourth exhaust passage (4); the first flange (8) and the second flange (9) are split, a first notch (18) is formed between the first flange (8) and the second flange (9), a notch is formed in the positions, close to the first notch (18), of the first flange (8) and the second flange (9), and a notch bolt hole (16) is formed in each notch; the second flange (9) and the third flange (10) are split, a second notch (19) is formed between the second flange (9) and the third flange (10), and the second flange (9) and the third flange (10) are fixed through bolts respectively; the third flange (10) and the fourth flange (11) are integrated;
a balance point (22) is arranged between the first flange (8) and the second flange (9), the first notch (18) is linear, one end of the first notch (18) passes through the notch bolt hole (16), and the other end of the first notch (18) passes through the balance point (22);
the balance point is the intersection point of a perpendicular bisector of a central connecting line of a first bolt hole (12) on the first flange (8) and a second bolt hole (13) on the second flange (9) and the inlet flange plate.
2. The exhaust manifold for a four-cylinder turbocharged engine according to claim 1, wherein: a common bolt hole (17) is formed in the joint of the third flange (10) and the fourth flange (11), and a special-shaped groove (20) used for releasing internal stress is formed in the joint of the third flange (10) and the fourth flange (11).
3. The exhaust manifold for a four-cylinder turbocharged engine according to claim 1 or 2, characterized in that: and a tool withdrawal groove (21) for processing the upper surface of the bolt hole is formed on the upper surface of the inlet flange plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711048192.3A CN107725161B (en) | 2017-10-31 | 2017-10-31 | Exhaust manifold for four-cylinder turbine engine |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711048192.3A CN107725161B (en) | 2017-10-31 | 2017-10-31 | Exhaust manifold for four-cylinder turbine engine |
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| Publication Number | Publication Date |
|---|---|
| CN107725161A CN107725161A (en) | 2018-02-23 |
| CN107725161B true CN107725161B (en) | 2020-04-07 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711048192.3A Active CN107725161B (en) | 2017-10-31 | 2017-10-31 | Exhaust manifold for four-cylinder turbine engine |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0821236A (en) * | 1994-07-07 | 1996-01-23 | Hitachi Metals Ltd | Exhaust manifold |
| CN103452633A (en) * | 2012-05-30 | 2013-12-18 | 重庆长安汽车股份有限公司 | Exhaust manifold for turbocharged engine |
| CN203655400U (en) * | 2013-11-14 | 2014-06-18 | 东风汽车公司 | High temperature resistant cast iron exhaust manifold |
| CN204060889U (en) * | 2014-08-29 | 2014-12-31 | 重庆小康工业集团股份有限公司 | Engine exhaust manifold assembly |
-
2017
- 2017-10-31 CN CN201711048192.3A patent/CN107725161B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0821236A (en) * | 1994-07-07 | 1996-01-23 | Hitachi Metals Ltd | Exhaust manifold |
| CN103452633A (en) * | 2012-05-30 | 2013-12-18 | 重庆长安汽车股份有限公司 | Exhaust manifold for turbocharged engine |
| CN203655400U (en) * | 2013-11-14 | 2014-06-18 | 东风汽车公司 | High temperature resistant cast iron exhaust manifold |
| CN204060889U (en) * | 2014-08-29 | 2014-12-31 | 重庆小康工业集团股份有限公司 | Engine exhaust manifold assembly |
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| Publication number | Publication date |
|---|---|
| CN107725161A (en) | 2018-02-23 |
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