CN215633319U - Exhaust gas rectifying device, two-stage supercharger and engine assembly - Google Patents
Exhaust gas rectifying device, two-stage supercharger and engine assembly Download PDFInfo
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- CN215633319U CN215633319U CN202120811065.XU CN202120811065U CN215633319U CN 215633319 U CN215633319 U CN 215633319U CN 202120811065 U CN202120811065 U CN 202120811065U CN 215633319 U CN215633319 U CN 215633319U
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Abstract
The utility model relates to the technical field of exhaust rectification, and discloses an exhaust rectification device, wherein a turbine air outlet of a high-pressure stage supercharger and a turbine air inlet of a low-pressure stage supercharger are connected through a rectification bent pipe, the cross section of a bending section is set to be elliptical, the long axis of the ellipse is perpendicular to the plane of the central axis of the bending section, the bending section is in a flat pipe structure, the centrifugal force gradient at the bending position of the bending section is reduced, the degree of outward throwing of air flow is reduced, the difference of inner and outer flow speeds at the bending position of the bending section is reduced, the severity of boundary layer separation of the air flow is reduced, and the stability of the air flow is improved. The utility model also provides a two-stage supercharger and an engine assembly, wherein the exhaust gas rectifying device is used for connecting the turbine outlet of the high-pressure stage supercharger with the turbine inlet of the low-pressure stage supercharger, so that the flow loss between the turbine outlet of the high-pressure stage supercharger and the turbine inlet of the low-pressure stage supercharger is reduced.
Description
Technical Field
The utility model relates to the technical field of exhaust rectification, in particular to an exhaust rectification device, a two-stage supercharger and an engine assembly.
Background
The turbine air outlet of the high-pressure stage supercharger and the turbine air inlet of the low-pressure stage supercharger of the two-stage supercharger are communicated through a pipeline. Due to the rotation of the turbine, the airflow at the air outlet of the turbine of the high-pressure stage supercharger also flows out spirally, when the airflow discharged by the turbine of the high-pressure stage supercharger enters the turbine of the low-pressure stage supercharger, the boundary layer separation phenomenon of the airflow can occur, the exhaust flow loss is increased, a part of exhaust energy is converted into heat energy, and the heat efficiency of the low-pressure stage supercharger is reduced.
Therefore, there is a need for an exhaust gas rectification device for connecting two-stage superchargers to solve the above technical problems.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide an exhaust gas rectifying device, a two-stage supercharger and an engine assembly, which can reduce the exhaust gas flow loss of a low-pressure stage supercharger and improve the heat efficiency of the low-pressure stage supercharger.
In order to achieve the purpose, the utility model adopts the following technical scheme:
an exhaust gas rectifying device comprises a rectifying bent pipe, wherein the rectifying bent pipe comprises a bending section, an air inlet of the bending section is used for being connected with an air outlet of a turbine of a high-pressure stage supercharger in a two-stage supercharger, and an air outlet of the bending section is used for being connected with an air inlet of the turbine of the high-pressure stage supercharger in the two-stage supercharger; the cross section of the bending section is oval, and the long axis of the oval is perpendicular to the plane of the central axis of the bending section.
As a preferable technical solution of the exhaust gas rectification device, along the gas flow direction in the bent section, the length of the long axis of the cross section is increased first and then decreased.
As a preferable technical solution of the above exhaust gas rectification device, the minor axis length of the cross section gradually decreases along the gas flow direction in the bent section.
As a preferable aspect of the exhaust gas rectification device, the exhaust gas rectification device further includes:
the baffle is arranged in the bending section, is perpendicular to the plane of the central axis of the bending section and extends along the axial direction of the bending section.
As a preferable technical solution of the exhaust rectification device, the baffle divides an inner cavity of the bent section into an inner side flow channel located inside the bent section and an outer side flow channel located outside the bent section.
As a preferable technical solution of the above exhaust gas rectification device, the baffle plate and the bent section are integrally formed.
As a preferable technical solution of the exhaust gas rectification device, the bending section is a 90 ° bent pipe.
As an optimal technical scheme of the exhaust rectification device, an air inlet of the bending section is connected with an air inlet section, an air outlet of the bending section is connected with an air outlet section, and the air inlet section, the bending section and the air outlet section are integrally formed.
The utility model also provides a two-stage supercharger, which comprises a low-pressure-stage supercharger, a high-pressure-stage supercharger and the exhaust rectifying device in any scheme;
the air inlet of the bending section is communicated with the air outlet of the turbine of the low-pressure-stage supercharger, and the air outlet of the bending section is communicated with the air inlet of the high-pressure-stage supercharger.
The utility model also provides an engine comprising the two-stage supercharger.
Has the advantages that:
according to the exhaust gas rectifying device provided by the utility model, the turbine air outlet of the high-pressure stage supercharger and the turbine air inlet of the low-pressure stage supercharger are connected through the rectifying bent pipe, the cross section of the bending section is set to be oval, the long axis of the oval is perpendicular to the plane of the central axis of the bending section, the bending section is of a flat pipe structure, the centrifugal force gradient at the bending position of the bending section is reduced, the degree of outward throwing of air flow is reduced, the difference of inner and outer flow speeds at the bending position of the bending section is reduced, the severity of boundary layer separation of the air flow is reduced, the stability of the air flow is improved, and the energy loss is reduced.
The utility model also provides a two-stage supercharger and an engine assembly, wherein the two-stage supercharger comprises the exhaust gas rectifying device, and the exhaust gas rectifying device is used for connecting the turbine air outlet of the high-pressure stage supercharger and the turbine air inlet of the low-pressure stage supercharger, so that the flow loss between the turbine air outlet of the high-pressure stage supercharger and the turbine air inlet of the low-pressure stage supercharger is reduced, and the thermal efficiency of the low-pressure stage supercharger is improved.
Drawings
Fig. 1 is a sectional view of an exhaust gas rectification device according to an embodiment of the present invention.
In the figure:
1. bending sections; 2. an air intake section; 3. an air outlet section; 4. a baffle plate; 5. an inner flow passage; 6. an outer flow passage.
Detailed Description
In order to make the technical problems solved, the technical solutions adopted and the technical effects achieved by the present invention clearer, the technical solutions of the present invention are further described below by way of specific embodiments with reference to the accompanying drawings.
In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, removably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
In the description of the present embodiment, the terms "upper", "lower", "right", and the like are used in the orientation or positional relationship shown in the drawings only for convenience of description and simplicity of operation, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to have a special meaning.
As shown in fig. 1, the present embodiment provides an exhaust gas rectification device, a two-stage supercharger and an engine assembly, wherein the engine assembly includes the two-stage supercharger and an engine, the two-stage supercharger includes a high-pressure stage supercharger, a low-pressure stage supercharger and an exhaust gas rectification device, and a turbine outlet of the high-pressure stage supercharger is communicated with a turbine outlet of the low-pressure stage supercharger through the exhaust gas rectification device so as to connect the two-stage supercharger by the exhaust gas rectification device.
The exhaust rectifying device comprises a rectifying elbow, the rectifying elbow comprises an air inlet section 2, a bending section 1 and an air outlet section 3 which are sequentially connected, an air inlet of the bending section 1 is connected to a turbine air outlet of the high-pressure-stage supercharger through the air inlet section 2, and an air outlet of the bending section 1 is connected to a turbine air outlet of the low-pressure-stage supercharger through the air outlet section 3.
Because the space arrangement of the turbine air outlet of the high-pressure stage supercharger and the air inlet of the low-pressure stage supercharger is limited, the rectifying bent pipe adopts a 90-degree bent pipe, when the two-stage supercharger using the exhaust gas rectifying device is installed on an engine, the central axis of the air inlet section 2 is approximately horizontally arranged, the central axis of the air outlet section 3 is approximately vertically arranged, and the air inlet section 2 is higher than the air outlet section 3. The structure of the air inlet section 2 is determined according to the structure of the turbine air outlet of the high-pressure stage supercharger, and the structure of the air outlet section 3 is determined according to the structure of the turbine air outlet of the low-pressure stage supercharger, and details are not repeated. It should be noted that the structures of the inlet section 2 and the outlet section 3 in the drawings are merely schematic, and do not necessarily represent the actual structures of the inlet section 2 and the outlet section 3.
Furthermore, a baffle 4 is arranged in the bending section 1, and the baffle 4 is perpendicular to the plane of the central axis of the bending section 1 and extends along the axial direction of the bending section 1. By arranging the baffle 4, the Reynolds number of the air flow at the two sides of the baffle 4 can be reduced, the rotating air flow discharged from the turbine air outlet of the high-pressure stage supercharger can be smoothed, the flow speed difference between the air at the two sides of the baffle 4 can be reduced, and the energy loss of the air flow can be reduced.
Further, the baffle 4 divides the inner cavity of the bending section 1 into two flow channels, which are an inner side flow channel 5 located at the inner side of the bending section 1 and an outer side flow channel 6 located at the outer side of the bending section 1. The outer flow passage 6 is required to be higher than the inner flow passage 5 based on the spatial arrangement of the two-stage supercharger mounted on the engine. By providing the baffle plate 4, not only the flow velocity of the gas in the inner flow path 5 but also the flow velocity of the gas in the outer flow path 6 can be reduced, and the difference in flow velocity between the gas in the inner flow path 5 and the gas in the outer flow path 6 can be reduced.
Further, in order to simplify the processing and improve the stability of the connection position of the bending section 1 and the baffle 4, in this embodiment, the baffle 4 and the bending section 1 are integrally formed.
Further, the air inlet section 2, the bending section 1 and the air outlet section 3 are integrally formed. Preferably, the air inlet section 2, the bending section 1 and the air outlet section 3 are integrally formed in a casting mode, and the processing technology is simplified.
Further, the cross section of the bending section 1 is elliptical, and the major axis of the ellipse is perpendicular to the plane of the central axis of the bending section 1. By adopting the above arrangement, the bending section 1 is of a flat tube structure, the centrifugal force gradient at the bending position of the bending section 1 is reduced, the degree of outward throwing of the air flow is reduced, the difference between the inner flow speed and the outer flow speed at the bending position of the bending section 1 is reduced, the severity of the boundary layer separation phenomenon of the air flow is reduced, the stability of the air flow is improved, and the energy loss is reduced.
Further, along the gas flow direction in the section of bending 1, the major axis length of above-mentioned cross section increases earlier the back and reduces, the minor axis length of above-mentioned cross section reduces gradually, it is the flat tubular construction of variable cross section to realize the section of bending 1, the design of baffle 4 is mated again, not only can reduce the centrifugal force gradient of the section of bending 1 bending position department, reduce the degree that the air current is toward getting rid of outward, can also further reduce the gas velocity in inboard runner 5 and the outside runner 6, reduce the difference of flow between the gas in inboard runner 5 and the gas in the outside runner 6 simultaneously.
According to the exhaust rectifying device provided by the embodiment, the baffle 4 is arranged, and the bending section 1 adopts a variable-section flat tube structure, so that the flow speed difference inside and outside the bending section 1 can be reduced, the severity of the boundary layer separation phenomenon of airflow is reduced, the stability of the airflow is improved, and the energy loss is reduced; the exhaust rectifying device is simple in structure, high in reliability and free of any electric control structure; the volume is small, the weight is light, the space arrangement of the two-stage supercharger is not required to be changed when the device is applied, the device can be completely arranged according to the existing two-stage supercharger, and the cost is low.
In the two-stage supercharger provided by the embodiment, the exhaust gas rectifying device is adopted, and the exhaust gas rectifying device is used for connecting the turbine outlet of the high-pressure-stage supercharger and the turbine inlet of the low-pressure-stage supercharger, so that the flow loss between the turbine outlet of the high-pressure-stage supercharger and the turbine inlet of the low-pressure-stage supercharger is reduced, and the thermal efficiency of the low-pressure-stage supercharger is improved.
The above description is only a preferred embodiment of the present invention, and for those skilled in the art, the present invention should not be limited by the description of the present invention, which should be interpreted as a limitation.
Claims (10)
1. An exhaust gas rectifying device comprises a rectifying bent pipe, wherein the rectifying bent pipe comprises a bending section (1), an air inlet of the bending section (1) is used for being connected with an air outlet of a turbine of a high-pressure stage supercharger in a two-stage supercharger, and an air outlet of the bending section (1) is used for being connected with an air inlet of the turbine of the low-pressure stage supercharger in the two-stage supercharger; the bending device is characterized in that the cross section of the bending section (1) is oval, and the long axis of the oval is perpendicular to the plane of the central axis of the bending section (1).
2. The exhaust gas rectification device according to claim 1, characterized in that the major axis length of the cross section increases first and then decreases in the direction of gas flow in the bent section (1).
3. The exhaust gas rectification device as claimed in claim 2, characterized in that the minor axis of the cross section decreases in length in the direction of the gas flow in the bent section (1).
4. The exhaust gas rectification device according to any one of claims 1 to 3, further comprising:
the baffle (4) is arranged in the bending section (1), and the baffle (4) is perpendicular to the plane of the central axis of the bending section (1) and extends along the axial direction of the bending section (1).
5. The exhaust gas rectification device according to claim 4, characterized in that the baffle (4) divides the inner cavity of the bend (1) into an inner flow channel (5) located inside the bend of the bend (1) and an outer flow channel (6) located outside the bend of the bend (1).
6. The exhaust gas rectification device as claimed in claim 5, characterized in that the baffle (4) is integrally formed with the bent section (1).
7. The exhaust gas rectification device according to any one of claims 1 to 3, characterized in that the rectification elbow is a 90 ° elbow.
8. The exhaust gas rectification device according to any one of claims 1 to 3, characterized in that an air inlet section (2) is connected to an air inlet of the bending section (1), an air outlet section (3) is connected to an air outlet of the bending section (1), and the air inlet section (2), the bending section (1) and the air outlet section (3) are integrally formed.
9. A two-stage supercharger comprising a low-pressure stage supercharger, a high-pressure stage supercharger, and an exhaust gas rectification device as claimed in any one of claims 1 to 8;
the air inlet of the bending section (1) is communicated with the air outlet of a turbine of the low-pressure-stage supercharger, and the air outlet of the bending section (1) is communicated with the air inlet of the high-pressure-stage supercharger.
10. An engine assembly comprising the two-stage supercharger of claim 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120811065.XU CN215633319U (en) | 2021-04-20 | 2021-04-20 | Exhaust gas rectifying device, two-stage supercharger and engine assembly |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120811065.XU CN215633319U (en) | 2021-04-20 | 2021-04-20 | Exhaust gas rectifying device, two-stage supercharger and engine assembly |
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| Publication Number | Publication Date |
|---|---|
| CN215633319U true CN215633319U (en) | 2022-01-25 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120811065.XU Active CN215633319U (en) | 2021-04-20 | 2021-04-20 | Exhaust gas rectifying device, two-stage supercharger and engine assembly |
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| CN (1) | CN215633319U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116241508A (en) * | 2023-05-12 | 2023-06-09 | 潍柴动力股份有限公司 | Air outlet pipe of air compressor, air compressor and engine |
-
2021
- 2021-04-20 CN CN202120811065.XU patent/CN215633319U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116241508A (en) * | 2023-05-12 | 2023-06-09 | 潍柴动力股份有限公司 | Air outlet pipe of air compressor, air compressor and engine |
| CN116241508B (en) * | 2023-05-12 | 2023-09-15 | 潍柴动力股份有限公司 | Air outlet pipe of air compressor, air compressor and engine |
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