CN213510947U - EGR cooler, EGR system and internal combustion engine - Google Patents
EGR cooler, EGR system and internal combustion engine Download PDFInfo
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- CN213510947U CN213510947U CN202021328723.1U CN202021328723U CN213510947U CN 213510947 U CN213510947 U CN 213510947U CN 202021328723 U CN202021328723 U CN 202021328723U CN 213510947 U CN213510947 U CN 213510947U
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- egr cooler
- egr
- oxidation catalyst
- catalyst coating
- air passage
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Abstract
The utility model relates to an EGR cooler, an EGR system and an internal combustion engine, wherein the inner wall of an air passage of the EGR cooler is provided with an oxidation catalyst coating, the oxidation catalyst coating has obvious oxidation capability when the temperature reaches more than 100 ℃, the conversion efficiency required by HC can be realized when the temperature reaches more than 150 ℃, when the engine works normally, the temperature of the exhaust gas inlet of the EGR cooler can reach more than 500 ℃, the temperature of the cooled exhaust gas can also reach more than 120 ℃, and the engine has the catalytic oxidation conditions of hydrocarbon and the like, therefore, by arranging the oxidation catalyst coating on the inner wall of the air passage of the EGR cooler, HC and soot in the exhaust gas can be oxidized when the exhaust gas passes through the air passage of the EGR cooler, carbon deposition on the air passage of the EGR cooler is reduced, the cleaning period of the EGR cooler can be prolonged, the EGR cooler does not need to be cleaned any more, and the purposes of reducing the burden of a user and improving the user experience are achieved.
Description
Technical Field
The utility model relates to an internal-combustion engine system technical field, in particular to EGR cooler, EGR system and internal-combustion engine.
Background
EGR technology is an effective method of reducing engine emissions, and high temperature exhaust gas from the exhaust manifold typically needs to be cooled by an EGR cooler before entering the intake manifold.
Because the exhaust gas contains components such as soot, the soot may accumulate on the inner wall of the air passage of the EGR cooler, resulting in a decrease in cooling efficiency. Therefore, the EGR cooler needs to be cleaned of carbon deposition according to the use condition of the EGR cooler, so that burden is caused to a user, and the use experience of the user is influenced.
SUMMERY OF THE UTILITY MODEL
A first object of the utility model is to provide an EGR cooler to solve the carbon deposit problem or prolong clearance cycle, improve the user and use experience.
A second object of the present invention is to provide an EGR system and an internal combustion engine based on the above EGR cooler.
In order to achieve the above object, the utility model provides a following technical scheme:
an EGR cooler is provided with an oxidation catalyst coating on the inner wall of an air passage of the EGR cooler.
Preferably, fins are arranged on the inner wall of the air passage of the EGR cooler, and an oxidation catalyst coating is arranged on the fins.
Preferably, the air passage of the EGR cooler is of a wave-shaped configuration.
Preferably, the oxidation catalyst coating extends from an inlet end to an outlet end of the EGR cooler.
Preferably, the oxidation catalyst coating extends from an inlet end of the EGR cooler to a position a predetermined distance from an outlet end, the predetermined distance being greater than zero.
Preferably, the oxidation catalyst coating is gradually narrowed in a range from an inlet end to an outlet end of the EGR cooler.
An EGR system comprising an EGR cooler as described in any preceding claim.
An internal combustion engine comprising an EGR system as in one above.
According to the above technical scheme, the utility model discloses a EGR cooler, be provided with oxidation catalyst coating on this EGR cooler's the air flue inner wall, this oxidation catalyst coating is current conventional oxidation catalyst coating, generally by metal matrix layer, the alumina oxide layer and by platinum (Pt), noble metal catalyst layer such as palladium (Pd) constitute, above-mentioned oxidation catalyst coating has obvious oxidizing power at the temperature more than reaching 100 ℃, the conversion efficiency that the temperature reaches the HC requirement more than 150 ℃, and when the engine normally works, EGR cooler waste gas inlet temperature can reach more than 500 ℃, exhaust gas temperature also can reach more than 120 ℃ after the cooling, the catalytic oxidation's such as possess carbon hydrogen condition, consequently through set up oxidation catalyst coating on EGR cooler's air flue inner wall, can be when waste gas passes through EGR cooler air flue, HC and carbon smoke in the exhaust gas are oxidized, carbon deposition on an air passage of the EGR cooler is reduced, the cleaning period of the EGR cooler can be prolonged, even the EGR cooler does not need to be cleaned, and the purposes of reducing user burden and improving user experience are achieved.
The utility model also provides an EGR system and internal-combustion engine based on above-mentioned EGR cooler, because above-mentioned EGR cooler has all been adopted to this EGR system and internal-combustion engine, consequently EGR system and internal-combustion engine have above-mentioned EGR cooler's beneficial effect concurrently.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a longitudinal sectional view of an EGR cooler according to an embodiment of the present invention;
fig. 2 is a cross-sectional view of an EGR cooler according to an embodiment of the present invention.
Wherein:
1 is an EGR cooler; 2 is an air passage; and 3 is an oxidation catalyst coating.
Detailed Description
One of the cores of the utility model is to provide an EGR cooler to reach and solve the carbon deposit problem or prolong clearance cycle, reduce user's burden, improve the purpose that the user used experience.
The other core of the utility model is to provide an EGR system and internal-combustion engine based on above-mentioned EGR cooler.
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Referring to fig. 1 and 2, fig. 1 is a longitudinal sectional view of an EGR cooler according to an embodiment of the present invention, and fig. 2 is a transverse sectional view of the EGR cooler according to an embodiment of the present invention.
The embodiment of the utility model discloses EGR cooler 1, be provided with oxidation catalyst coating 3 on this EGR cooler 1's 2 inner walls of air flue of this EGR cooler, this oxidation catalyst coating 3 is current conventional oxidation catalyst coating 3, generally by the metal substrate layer, the alumina oxide layer and by platinum (Pt), precious metal catalyst layer such as palladium (Pd) constitute, above-mentioned oxidation catalyst coating 3 has obvious oxidizing power above the temperature reaches 100 ℃, the conversion efficiency that the temperature just can realize the requirement to HC more than 150 ℃, and the engine during normal work, EGR cooler 1 waste gas inlet temperature can reach more than 500 ℃, exhaust gas temperature also can reach more than 120 ℃ after the cooling, possess catalytic oxidation's such as hydrocarbon conditions.
It can be seen that, compared with the prior art, the embodiment of the utility model provides an EGR cooler 1 sets up oxidation catalyst coating 3 on 2 inner walls of the air flue of EGR cooler 1, can be when waste gas passes through 1 air flue 2 of EGR cooler, oxidation HC and soot wherein, reduce the carbon deposit on 1 air flue 2 of EGR cooler, can prolong 1 clearance cycle of EGR cooler, need not clear up EGR cooler 1 again even, reach and reduce user's burden, improve user experience's purpose.
Preferably, fins are provided on the inner wall of the gas passage 2 of the EGR cooler 1, and the oxidation catalyst coating 3 is provided on the fins to increase the contact area of the exhaust gas with the oxidation catalyst coating 3.
Further, in the embodiment of the utility model provides an in, the air flue 2 of EGR cooler 1 is the wave structure, and waste gas can be in contact with oxidation catalyst coating 3 on the 2 inner walls of air flue repeatedly under the curve effect of air flue 2 like this when passing through air flue 2, increases the oxidation effect to HC in the waste gas and soot.
In an embodiment of the present invention, the oxidation catalyst coating 3 extends from the air inlet end of the EGR cooler 1 to the air outlet end, i.e. the oxidation catalyst coating 3 is distributed over the inner walls of the respective air passages 2 of the EGR cooler 1.
Although the mode that the oxidation catalyst coating 3 is fully distributed on the inner wall of each air passage 2 has the best oxidation effect on the exhaust gas, the oxidation catalyst coating 3 close to the air outlet end of the EGR cooler 1 has little influence on the final oxidation effect in consideration of the gradual reduction of the temperature of the exhaust gas from the inlet to the outlet, the oxidation effect and the economical efficiency are comprehensively considered, and the oxidation catalyst coating 3 can be arranged in a position close to the air outlet end of the EGR cooler 1 in a small amount or not.
Specifically, in another embodiment of the present invention, the oxidation catalyst coating 3 extends from the air intake end of the EGR cooler 1 to a position at a predetermined distance from the air outlet end, the predetermined distance being greater than zero, i.e., the oxidation catalyst coating 3 is not provided in the vicinity of the air outlet end.
Alternatively, the range of the oxidation catalyst coating 3 that is disposed in the direction from the inlet end to the outlet end of the EGR cooler 1 may be gradually narrowed, that is, the oxidation catalyst coating 3 no longer fills the gas passages 2 at the outlet end position.
The embodiment of the utility model provides a still provide an EGR system, this EGR system includes as above-mentioned embodiment EGR cooler 1.
Further, the embodiment of the utility model provides a still provide an internal-combustion engine, this internal-combustion engine includes above-mentioned EGR system.
Since the EGR cooler 1 is adopted in the above embodiments, the technical effects of the EGR system and the internal combustion engine refer to the above embodiments.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (7)
1. An EGR cooler is characterized in that an oxidation catalyst coating is arranged on the inner wall of an air passage of the EGR cooler, fins are arranged on the inner wall of the air passage of the EGR cooler, an oxidation catalyst coating is arranged on the fins, and the oxidation catalyst coating is used for oxidizing HC and soot in exhaust gas.
2. The EGR cooler of claim 1 wherein the air passages of the EGR cooler are of a corrugated configuration.
3. The EGR cooler of claim 1 or 2 wherein the oxidation catalyst coating extends from an inlet end to an outlet end of the EGR cooler.
4. The EGR cooler of claim 1 or 2 wherein the oxidation catalyst coating extends from an inlet end of the EGR cooler to a location a predetermined distance from an outlet end, the predetermined distance being greater than zero.
5. The EGR cooler of claim 1 or 2, wherein the oxidation catalyst coating is gradually narrowed in a range disposed in a direction from an inlet end to an outlet end of the EGR cooler.
6. An EGR system, characterized in that the EGR system comprises an EGR cooler according to any of claims 1-5.
7. An internal combustion engine, characterized in that it comprises an EGR system according to claim 6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021328723.1U CN213510947U (en) | 2020-07-08 | 2020-07-08 | EGR cooler, EGR system and internal combustion engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021328723.1U CN213510947U (en) | 2020-07-08 | 2020-07-08 | EGR cooler, EGR system and internal combustion engine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213510947U true CN213510947U (en) | 2021-06-22 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021328723.1U Active CN213510947U (en) | 2020-07-08 | 2020-07-08 | EGR cooler, EGR system and internal combustion engine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN213510947U (en) |
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2020
- 2020-07-08 CN CN202021328723.1U patent/CN213510947U/en active Active
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