Double-runner turbocharger

Abstract

The double-flow-channel turbocharger comprises a volute body and two air inlet channels surrounding the periphery of the volute body, the two air inlet channels are configured to convey exhaust gas from an engine into the volute body, the cross section areas of the two air inlet channels are different, and the two air inlet channels are communicated with the volute body. The double-runner turbocharger further comprises two bypass channels, and the two bypass channels communicate with the two air inlet channels in a one-to-one correspondence mode and are configured to bypass at least one part of exhaust gas from the corresponding air inlet channels to bypass a turbine impeller in the volute body and exhaust the exhaust gas. The two bypass channels are internally provided with bypass valves respectively, the two bypass valves are controlled by independent actuators respectively to adjust the amount of exhaust gas entering the volute body through the corresponding air inlet channels, and then the exhaust gas recirculation utilization rate and the torque of an engine are controlled respectively.

Description

Technical Field

[0001] The embodiments disclosed herein generally relate to the field of turbocharger technology, and more particularly to a dual-flow turbocharger. Background Technology

[0002] A turbocharger utilizes the energy of a high-temperature fluid, such as exhaust gas from an engine, to rotate turbine blades, thereby rotating the impeller of a compressor mechanically connected to the turbine blades via a rotating shaft. The turbocharger compresses the gases used for combustion in the engine (e.g., air) and delivers them into the engine via the rotating impeller. Conventional twin-scroll turbochargers typically have a scroll housing and two intake passages surrounding it, each corresponding to one of the engine's two exhaust manifolds and receiving exhaust gas from the engine from its respective manifold. Furthermore, each intake passage is associated with a bypass valve to control the amount of exhaust gas entering the scroll housing via its respective intake passage. In the prior art, these two bypass valves are typically controlled by the same actuator; however, this cannot simultaneously meet the requirements for regulating the engine's exhaust gas recirculation (EGR) rate and engine torque. Utility Model Content

[0003] This disclosure is made in order to overcome at least one of the above-mentioned and other problems and defects existing in the prior art.

[0004] According to embodiments of this disclosure, a twin-scroll turbocharger is provided, including a turbine housing body and a first intake passage and a second intake passage surrounding the turbine housing body. The first intake passage and the second intake passage are respectively configured to deliver exhaust gas from an engine into the turbine housing body, wherein the cross-sectional area of ​​the first intake passage is smaller than the cross-sectional area of ​​the second intake passage. The twin-scroll turbocharger further includes a first bypass passage and a second bypass passage. The first bypass passage communicates with the first intake passage and is configured to bypass at least a portion of the exhaust gas from the first intake passage, bypassing a turbine impeller within the turbine housing body and discharging it. The second bypass passage communicates with the first intake passage. The second intake passage is connected and configured to bypass at least a portion of the exhaust gas from the second intake passage around the impeller within the turbine housing and discharge it. A first bypass valve is provided within the first bypass passage, which is controllable by an actuator to regulate the amount of exhaust gas entering the turbine housing via the first intake passage, thereby controlling the exhaust gas recirculation rate and torque of the engine. A second bypass valve is provided within the second bypass passage, which is controllable by another actuator to regulate the amount of exhaust gas entering the turbine housing via the second intake passage, thereby controlling the torque of the engine. The torque of the engine is primarily controlled by the second bypass valve.

[0005] According to an exemplary embodiment of this disclosure, the torque of the engine is primarily controlled by the second actuator via the second bypass valve.

[0006] According to an exemplary embodiment of the present disclosure, a first mounting chamber for mounting the first bypass valve is formed on the first bypass channel.

[0007] According to an exemplary embodiment of the present disclosure, the first bypass passage is configured to guide at least a portion of the exhaust gas from the first intake passage to the exhaust port of the volute body.

[0008] According to an exemplary embodiment of the present disclosure, the first bypass channel includes a first intake section connecting the first mounting chamber and the first intake channel, and a first exhaust section connecting the first mounting chamber and the exhaust port of the volute body.

[0009] According to an exemplary embodiment of the present disclosure, the first mounting chamber is disposed outside the first air intake passage in the radial direction of the vortex body.

[0010] According to an exemplary embodiment of the present disclosure, the first intake section is arranged around the outer side of the first intake passage in the radial direction of the vortex body.

[0011] According to an exemplary embodiment of the present disclosure, one end of the first air outlet section is connected to the side of the first mounting chamber near the exhaust port, and the other end of the first air outlet section is tangentially connected to the exhaust port of the volute body.

[0012] According to an exemplary embodiment of the present disclosure, the first mounting chamber is disposed in the axial direction of the volute body on the side of the first intake passage near the exhaust port.

[0013] According to an exemplary embodiment of the present disclosure, the first exhaust section extends radially along the exhaust port and communicates with the exhaust port.

[0014] According to an exemplary embodiment of the present disclosure, a second mounting chamber for mounting the second bypass valve is formed on the second bypass channel.

[0015] According to an exemplary embodiment of the present disclosure, the second bypass passage is configured to discharge at least a portion of the exhaust gas from the second intake passage to the exhaust port of the volute body.

[0016] According to an exemplary embodiment of the present disclosure, the second bypass channel includes a second intake section connected between the second mounting chamber and the second intake channel, and a second exhaust section connected between the second mounting chamber and the exhaust port of the volute body.

[0017] According to an exemplary embodiment of the present disclosure, the second mounting chamber is disposed in the axial direction of the volute body on the side of the second intake passage near the exhaust port.

[0018] According to an exemplary embodiment of the present disclosure, the second exhaust section extends radially along the exhaust port and communicates with the exhaust port.

[0019] According to an exemplary embodiment of the present disclosure, the second mounting chamber is disposed outside the second air intake passage in the radial direction of the vortex body.

[0020] According to an exemplary embodiment of the present disclosure, the second air intake section is arranged around the outer side of the second air intake passage in the radial direction of the vortex body.

[0021] According to an exemplary embodiment of the present disclosure, one end of the second air outlet section is connected to the side of the second mounting chamber near the exhaust port, and the other end of the second air outlet section is tangentially connected to the exhaust port of the vortex body.

[0022] According to an exemplary embodiment of the present disclosure, the cross-sectional area of ​​the first bypass channel is smaller than the cross-sectional area of ​​the second bypass channel.

[0023] According to an exemplary embodiment of the present disclosure, the center of the air outlet of the first bypass channel and the center of the air outlet of the second bypass channel are offset from each other in the axial direction of the vortex body.

[0024] According to an exemplary embodiment of this disclosure, the vortex shell body, the first intake channel, the second intake channel, the first bypass channel, and the second bypass channel are integrally formed by a casting process.

[0025] Other objects and advantages of this disclosure will become apparent from the following description of the disclosure with reference to the accompanying drawings, and will help to provide a comprehensive understanding of the disclosure. Attached Figure Description

[0026] Figure 1 This is a schematic diagram illustrating the structure of a twin-scroll turbocharger according to an exemplary embodiment of the present disclosure, wherein the actuator has been removed.

[0027] Figure 2 yes Figure 1 The rear view of the twin-scroll turbocharger shown.

[0028] Figure 3 yes Figure 1 The left view of the twin-scroll turbocharger shown.

[0029] Figure 4 yes Figure 1 The right view of the twin-scroll turbocharger shown.

[0030] Figure 5 This is a schematic cross-sectional view of a twin-scroll turbocharger according to an exemplary embodiment of the present disclosure, in which the actuator is shown.

[0031] Figure 6 yes Figure 5 The diagram shows a side view of a twin-scroll turbocharger.

[0032] Figure 7 yes Figure 5 Another cross-sectional view of the twin-scroll turbocharger shown.

[0033] Figure 8 yes Figure 5 Another cross-sectional schematic diagram of the twin-scroll turbocharger shown.

[0034] Figure 9This is a schematic diagram illustrating the structure of a twin-scroll turbocharger according to an exemplary embodiment of the present disclosure, wherein the actuator has been removed.

[0035] Figure 10 yes Figure 9 The right view of the twin-scroll turbocharger shown.

[0036] Figure 11 yes Figure 9 The left view of the twin-scroll turbocharger shown. Detailed Implementation

[0037] The embodiments of this disclosure will now be described in detail with reference to the accompanying drawings. In this specification, identical or similar components are indicated by identical or similar reference numerals. The following description of various embodiments of this disclosure with reference to the accompanying drawings is intended to illustrate the overall concept of this disclosure and should not be construed as a limitation thereof.

[0038] Furthermore, in the following detailed description, numerous specific details are set forth for ease of explanation to provide a thorough understanding of embodiments of the present disclosure. However, it will be apparent that one or more embodiments may be practiced without these specific details. In other instances, well-known structures and apparatuses are illustrated to simplify the figures.

[0039] In the following detailed description, directional terms such as "front", "rear", "upper", "lower", "top", "bottom", "left", "right", "upper part" and "lower part", "inner", and "outer" are defined according to the accompanying drawings, but the shape and position of the parts are not limited by these terms and can be adjusted according to the actual application.

[0040] Although the terms “first,” “second,” etc., may be used herein to describe a variety of different elements, these elements should not be limited by these terms. These terms are used only to distinguish one element from another. For example, without departing from the scope of this disclosure, a first element may be referred to as a second element, and a second element may be referred to as a first element. The term “and / or” includes a combination of multiple related items or any one of multiple related items.

[0041] like Figures 1 to 10As shown, according to an exemplary embodiment of the present disclosure, a dual-flow turbocharger is provided, the turbocharger including a volute body 10 and a first intake passage 22 and a second intake passage 32 surrounding the volute body 10, wherein the volute body 10 is used to house a turbine impeller 70, the first intake passage 22 is connected to a set of exhaust manifolds (not shown) of the engine via a first intake port 21 and is configured to receive exhaust gas from the exhaust manifold and then deliver the received exhaust gas into the volute body 10, the second intake passage 32 is connected to another set of exhaust manifolds (not shown) of the engine via a second intake port 31 and is configured to receive exhaust gas from the exhaust manifold and then deliver the received exhaust gas into the volute body 10, and then the exhaust gas from the first intake passage 22 and the second intake passage 32 causes the turbine impeller 70 located in the volute body 10 to rotate about a shaft 80, thereby driving the compressor impeller 90 to rotate, thereby drawing in intake air through the compressor inlet and delivering pressurized air into the engine. In this embodiment, the cross-sectional area of ​​the first intake passage 22 is smaller than that of the second intake passage 32. Furthermore, the twin-scroll turbocharger also includes first bypass passages 23 and 25 and second bypass passages 33 and 35. The first bypass passages 23 and 25 communicate with the first intake passage 22 and are configured to bypass at least a portion of the exhaust gas from the first intake passage 22, bypassing the turbine impeller 70 within the turbine housing 10 and discharging it. The second bypass passages 33 and 35 communicate with the second intake passage 32 and are configured to bypass at least a portion of the exhaust gas from the second intake passage 32, bypassing the turbine impeller 70 within the turbine housing 10 and discharging it. A first bypass valve 53 is provided in the first bypass passages 23 and 25. The first bypass valve 53 is controlled by a first actuator 51, for example, mounted on the turbine housing 10, via a connecting rod 52, to regulate the amount of exhaust gas discharged through the first bypass passages 23 and 25, and thereby regulate the amount of exhaust gas entering the turbine housing 10 through the first intake passage 22, thereby controlling the engine's exhaust gas recirculation rate (ERG rate) and torque. A second bypass valve 63 is provided in the second bypass passages 33 and 35. The second bypass valve 63 is controlled by a second actuator 61, for example, mounted on the turbine housing 10, via a connecting rod 62, to regulate the amount of exhaust gas discharged through the second bypass passages 33 and 35, and thereby regulate the amount of exhaust gas entering the turbine housing 10 through the second intake passage 32, thereby controlling the engine's torque.According to the dual-flow turbocharger disclosed herein, by setting two separate actuators to actuate the two bypass valves respectively, the amount of exhaust gas entering the turbine housing 10 through the first intake passage 22 and the second intake passage 32 can be controlled separately, thereby achieving separate control of the engine's exhaust gas recirculation rate (ERG rate) and torque, so as to achieve a balance between the two. In addition, while meeting the EGR rate, different opening degrees of the two bypass valves can be controlled separately to meet various operating conditions, and the optimal fuel consumption point can be found through calibration.

[0042] According to an exemplary embodiment of this disclosure, the engine torque is primarily controlled by the second actuator 61 via the second bypass valve 63. Specifically, the second bypass valve 63 can control 60% or more of the total amount of exhaust gas entering the turbine housing 10 via both the first intake passage 22 and the second intake passage 32. For example, the second bypass valve 63 can control 65%, 70%, 75%, 80%, etc., of the total amount of exhaust gas entering the turbine housing 10 via both the first intake passage 22 and the second intake passage 32, or the second bypass valve 63 can control 60%-65%, 65%-70%, 70%-75%, 75%-80%, 63%-68%, 68%-72%, 72%-76%, etc., of the total amount of exhaust gas entering the turbine housing 10 via both the first intake passage 22 and the second intake passage 32. The specific values ​​should be designed according to the specific application.

[0043] It should be noted that in this embodiment, the cross-sectional area of ​​the first bypass channels 23 and 25 is smaller than the cross-sectional area of ​​the second bypass channels 33 and 35. It should also be noted that in some other embodiments of this disclosure, the cross-sectional area of ​​the first bypass channel may be equal to or greater than the cross-sectional area of ​​the second bypass channel.

[0044] According to an exemplary embodiment of this disclosure, such as Figures 1 to 4 and Figure 7 As shown, a first mounting chamber 24 for installing a first bypass valve 53 is formed on the first bypass channels 23 and 25. According to an embodiment of this disclosure, by placing the first bypass valve 53 in the first mounting chamber 24, it is convenient to install the first bypass valve 53, and on the other hand, it can avoid the first bypass valve 53 being installed at, for example, the exhaust port of the volute body 10, which would affect the exhaust airflow.

[0045] According to an exemplary embodiment of this disclosure, such as Figures 1 to 4 and Figure 6As shown, the first bypass channels 23 and 25 are configured to guide at least a portion of the exhaust gas from the first intake channel 22 to the exhaust port 40 of the turbine body 10, and discharge it together with the exhaust gas discharged from the turbine body 10 through the exhaust port 40. The discharged exhaust gas can, for example, enter an exhaust gas aftertreatment system for treatment before being discharged into the atmosphere. It should be noted that in some other embodiments of this disclosure, the first bypass channels 23 and 25 may also directly discharge at least a portion of the exhaust gas from the first intake channel 22.

[0046] According to an exemplary embodiment of this disclosure, such as Figures 1 to 4 As shown, the first mounting chamber 24 is located radially outside the first intake passage 22, that is, the first mounting chamber 24 is located on the side of the first intake passage 22 away from the turbine body 10 in the radial direction. Since the cross-sectional area of ​​the first intake passage 22 is small, the first mounting chamber 24 can be located radially outside the first intake passage 22, so that the overall twin-scroll turbocharger is relatively compact to meet the requirements of a small installation space.

[0047] According to an exemplary embodiment of this disclosure, such as Figures 1 to 4 As shown, the first bypass channels 23 and 25 include a first intake section 23 connecting the first mounting chamber 24 and the first intake channel 22, and a first exhaust section 25 connecting the first mounting chamber 24 and the exhaust port 40 of the turbine body 10. The first intake section 23 is arranged around the radial outer side of the first intake channel 22, that is, the first intake section 23 is located on the side of the first intake channel 22 away from the turbine body 10 in the radial direction of the turbine body 10. This makes the overall structure of the twin-scroll turbocharger more compact.

[0048] According to an exemplary embodiment of this disclosure, such as Figure 3 As shown, one end of the first exhaust section 25 of the first bypass passages 23 and 25 is connected to the side of the first mounting chamber 24 near the exhaust port 40, and the other end of the first exhaust section 25 is tangentially connected to the exhaust port 40 of the turbine body 10. In this way, on the one hand, the dual-flow turbocharger can be made more compact as a whole, and on the other hand, the exhaust from the first mounting chamber 24 can smoothly enter the exhaust port 40 of the turbine body 10 through its exhaust port 26 and be discharged through the exhaust port 40.

[0049] According to an exemplary embodiment of this disclosure, such as Figure 5As shown, a second mounting chamber 34 for mounting a second bypass valve 63 is formed on the second bypass channels 33 and 35. According to an embodiment of this disclosure, by placing the second bypass valve 63 in the second mounting chamber 34, it is convenient to install the second bypass valve 63, and on the other hand, it can avoid the second bypass valve 63 being installed at, for example, the exhaust port of the volute body 10, which would affect the exhaust airflow.

[0050] According to an exemplary embodiment of this disclosure, such as Figures 1 to 4 and Figure 5 As shown, the second bypass channels 33 and 35 are configured to guide at least a portion of the exhaust gas from the second intake channel 32 to the exhaust port 40 of the turbine housing 10, and discharge it together with the exhaust gas discharged from the turbine housing 10 through the exhaust port 40. The discharged exhaust gas can, for example, enter an exhaust gas aftertreatment system for treatment before being discharged into the atmosphere. It should be noted that in some other embodiments of this disclosure, the second bypass channels 33 and 35 may also directly discharge at least a portion of the exhaust gas from the second intake channel 32.

[0051] According to an exemplary embodiment of this disclosure, such as Figure 1 As shown, the second mounting chamber 34 is located on the axial side of the second intake passage 32 near the exhaust port 40 of the volute body 10, that is, the second mounting chamber 34 is located on the side of the second intake passage 32 near the exhaust port 40 of the volute body 10 in the axial direction of the volute body 10.

[0052] According to an exemplary embodiment of this disclosure, such as Figure 1 and Figure 6 As shown, the second bypass channels 33 and 35 include a second intake section 33 connecting the second mounting chamber 34 and the second intake channel 32, and a second exhaust section 35 connecting the second mounting chamber 34 and the exhaust port 40 of the turbine housing 10. The second intake section 33 extends obliquely on the axial side of the second intake channel 32 near the exhaust port 40, while the second exhaust section 35 extends radially along the exhaust port 40 and communicates with the exhaust port 40. That is, one end of the second exhaust section 35 is connected to the side of the second mounting chamber 34 near the exhaust port 40 in the radial direction of the turbine housing 10, and the other end of the second exhaust section 35 is directly connected to the exhaust port 40 in the radial direction of the exhaust port 40. This makes the twin-scroll turbocharger more compact overall, and allows the exhaust from the second mounting chamber 34 to smoothly enter the exhaust port 40 of the turbine housing 10 through its exhaust port 36 and be discharged through the exhaust port 40. It should be noted that in some other embodiments of this disclosure, the other end of the second exhaust section may also be tangentially or in other directions connected to the exhaust port 40 of the vortex body 10.

[0053] According to an exemplary embodiment of this disclosure, such as Figures 9 to 11 As shown, the first mounting chamber 24 is disposed on the axial side of the first intake passage 22 near the exhaust port 40 of the turbine body 10, that is, the first mounting chamber 24 is disposed on the side of the first intake passage 22 near the exhaust port 40 of the turbine body 10 in the axial direction of the first intake passage 22. The first intake section 23 extends obliquely on the axial side of the first intake passage 22 near the exhaust port 40, while the first exhaust section 25 extends radially along the exhaust port 40 and communicates with the exhaust port 40.

[0054] According to an exemplary embodiment of this disclosure, such as Figures 9 to 11 As shown, the second mounting chamber 34 is located radially outside the second intake passage 32, that is, the second mounting chamber 34 is located on the side of the second intake passage 32 away from the turbine body 10 in the radial direction of the turbine body 10. The second intake section 33 of the second bypass passages 33 and 35 is arranged around the radially outside the second intake passage 32, that is, the second intake section 33 is located on the side of the second intake passage 32 away from the turbine body 10 in the radial direction of the turbine body 10. One end of the second exhaust section 35 of the second bypass passages 33 and 35 is connected to the side of the second mounting chamber 34 near the exhaust port 40, and the other end of the second exhaust section 35 is tangentially connected to the exhaust port 40 of the turbine body 10.

[0055] According to an exemplary embodiment not shown in this disclosure, both the first mounting chamber and the second mounting chamber are disposed on the axial side of the exhaust port of the first intake passage and the second intake passage near the exhaust port of the volute body. In this case, the first exhaust section of the first bypass passage extends in the radial direction of the exhaust port and communicates with or is tangentially connected to the exhaust port of the volute body; and / or, the second exhaust section of the second bypass passage extends in the radial direction of the exhaust port and communicates with or is tangentially connected to the exhaust port of the volute body 10.

[0056] According to an exemplary embodiment not shown in this disclosure, a first mounting chamber and a second mounting chamber are disposed radially outside the respective first and second intake channels. Specifically, the first mounting chamber is located on the side of the first intake channel away from the volute body in the radial direction of the volute body, and the second mounting chamber is located on the side of the second intake channel away from the volute body in the radial direction of the volute body. A first intake section of the first bypass channel is arranged radially outside the first intake channel. One end of a first outlet section of the first bypass channel communicates with the side of the first mounting chamber near the exhaust port, and the other end of the first outlet section is tangentially connected to the exhaust port of the volute body. A second intake section of the second bypass channel is arranged radially outside the second intake channel. One end of the second outlet section of the second bypass channel communicates with the side of the second mounting chamber near the exhaust port, and the other end of the second outlet section is tangentially connected to the exhaust port of the volute body.

[0057] According to an exemplary embodiment not shown in this disclosure, the center of the exhaust port 26 of the first bypass channels 23, 25 and the center of the exhaust port 36 of the second bypass channels 33, 35 are offset from each other in the axial direction of the volute body 10, so as to avoid mutual interference between the exhaust from the first bypass channel and the second bypass channel.

[0058] According to an exemplary embodiment of this disclosure, such as Figure 1 , Figure 9 As shown, the vortex shell body 10, the two air intake channels surrounding the vortex shell body 10, and the two bypass channels can be integrally formed by casting process.

[0059] According to the various embodiments of the present disclosure, the twin-scroll turbocharger uses two separate actuators to control two bypass valves associated with two different intake passages of the turbocharger. This allows for separate control of the amount of exhaust gas entering the turbine housing through the two intake passages, thereby achieving independent control of the engine's exhaust gas recirculation rate (ERG rate) and torque to achieve a balance between the two. Furthermore, while meeting the EGR rate, different opening degrees of the two bypass valves can be controlled to meet various operating conditions, and the optimal fuel consumption point can be found through calibration. In addition, this twin-scroll turbocharger has a compact structure and a small footprint.

[0060] Although embodiments of the present disclosure have been shown and described, it will be understood by those skilled in the art that variations may be made to these embodiments without departing from the principles and spirit of the present disclosure, the scope of which is defined by the appended claims and their equivalents. Furthermore, it should be noted that, unless otherwise specified, the terms “comprising,” “including,” and “having” as used herein do not exclude other elements or steps. Additionally, any reference numerals in the claims should not be construed as limiting the scope of the present disclosure.

Claims

1. A twin-scroll turbocharger, characterized by, The dual-flow turbocharger includes a turbine housing body and first and second intake passages surrounding the turbine housing body and configured to deliver exhaust gas from an engine into the turbine housing body, wherein a cross-sectional area of the first intake passage is less than a cross-sectional area of the second intake passage, the dual-flow turbocharger further includes first and second bypass passages in communication with the first and second intake passages, respectively, and configured to bypass at least a portion of exhaust gas from the first and second intake passages around a turbine wheel within the turbine housing body and out, wherein a first bypass valve is disposed within the first bypass passage and controllable by an actuator to regulate an amount of exhaust gas entering the turbine housing body via the first intake passage to control an exhaust gas recirculation rate and torque of the engine, and a second bypass valve is disposed within the second bypass passage and controllable by another actuator to regulate an amount of exhaust gas entering the turbine housing body via the second intake passage to control the torque of the engine.

2. The two- flow turbocharger of claim 1 wherein, The torque of the engine is controlled by the second actuator via the second bypass valve.

3. The two- flow turbocharger of claim 1 wherein, A first mounting chamber for mounting the first bypass valve is formed on the first bypass passage.

4. The two- flow turbocharger of claim 3 wherein, The first bypass passage is configured to direct the at least a portion of exhaust gas from the first intake passage to an exhaust port of the turbine housing body.

5. The two- flow turbocharger of claim 4 wherein, The first bypass passage includes a first intake section connected between the first mounting chamber and the first intake passage, and a first exhaust section connected between the first mounting chamber and the exhaust port of the turbine housing body.

6. The two- flow turbocharger of claim 5 wherein, The first mounting chamber is disposed outside the first intake passage in a radial direction of the turbine housing body.

7. The two- flow turbocharger of claim 6 wherein, The first intake section is disposed outside the first intake passage in the radial direction of the turbine housing body.

8. The two- flow turbocharger of claim 7 wherein, One end of the first exhaust section is in communication with a side of the first mounting chamber close to the exhaust port, and the other end of the first exhaust section is tangentially connected to the exhaust port of the turbine housing body.

9. The two- flow turbocharger of claim 5 wherein, The first mounting chamber is disposed at a side of the first intake passage close to the exhaust port in an axial direction of the turbine housing body.

10. The two-flow turbocharger of claim 9, wherein, The first exhaust section extends in a radial direction of the exhaust port and is in communication with the exhaust port.

11. The two-flow turbocharger of any of claims 1 to 10, characterized by, A second mounting chamber for mounting the second bypass valve is formed on the second bypass passage.

12. The two- flow turbocharger of claim 11, wherein, The second bypass passage is configured to discharge the at least a portion of exhaust gas from the second intake passage to an exhaust port of the turbine housing body.

13. The two- flow turbocharger of claim 12 wherein, The second bypass passage includes a second intake section connected between the second mounting chamber and the second intake passage, and a second exhaust section connected between the second mounting chamber and the exhaust port of the turbine housing body.

14. The two- flow turbocharger of claim 13 wherein, The second installation chamber is arranged on the side of the second intake passage close to the exhaust port in the axial direction of the scroll body.

15. The two- flow turbocharger of claim 14 wherein, The second gas outlet section extends in the radial direction of the exhaust port and communicates with the exhaust port.

16. The two-flow turbocharger of claim 13 wherein, The second installation chamber is arranged on the outside of the second intake passage in the radial direction of the scroll body.

17. The two- flow turbocharger of claim 16, wherein The second intake section is arranged on the outside of the second intake passage in the radial direction of the scroll body.

18. The two- flow turbocharger of claim 17, wherein, One end of the second gas outlet section communicates with the side of the second installation chamber close to the exhaust port, and the other end of the second gas outlet section is tangentially connected to the exhaust port of the scroll body.

19. The two-flow turbocharger of any of claims 1 to 10, wherein, The cross-sectional area of the first bypass passage is smaller than the cross-sectional area of the second bypass passage.

20. The two-flow turbocharger of any of claims 1 to 10, wherein, The center of the gas outlet of the first bypass passage and the center of the gas outlet of the second bypass passage are staggered with each other in the axial direction of the scroll body.

21. The two-flow turbocharger of any of claims 1 to 10, wherein, The scroll body, the first intake passage, the second intake passage, the first bypass passage, and the second bypass passage are integrally formed by a casting process.

Images