Turbine bypass air bleed, turbomachine and turbocharger

Abstract

The application provides a turbine bypass air release device, a turbine and a turbocharger. The turbine bypass air release device comprises an air hole arranged on a turbine shell and a mounting portion arranged in the turbine shell. The mounting portion is provided with an inner wall surface. The turbine bypass air release device further comprises: a shaft sleeve assembly fixed to the mounting portion, comprising a first shaft sleeve and a second shaft sleeve, each of which is provided with a rotating inner cavity; a rotary butterfly valve arranged in the mounting portion, comprising a valve body and two rotating shafts. The valve body is fixedly connected with the two rotating shafts. The two rotating shafts are rotatably connected with the two rotating inner cavities respectively. The valve body is provided with an inner cavity chamber. The inner cavity chamber, the inner wall surface and the air hole cooperatively form an air release channel which is communicated with a flow passage of the turbine. A power mechanism is connected with the rotating shafts and is used for driving the rotary butterfly valve to rotate through the rotating shafts so as to adjust the exhaust capacity of the air release channel. The application improves the accuracy of bypass flow regulation and opening degree regulation, improves the stability of the operation of the turbocharger, and prolongs the service life of the power mechanism and other moving parts.

Description

Technical Field

[0001] This application relates to the field of internal combustion engine technology, and more specifically, to a turbine bypass bleed device, a turbine, and a turbocharger. Background Technology

[0002] For automotive engines, high-condition blowout regulation is often used to improve low-end performance. When the engine is at high speed, in order to limit the boost pressure, maximum burst pressure, and turbocharger speed within the allowable range, a portion of the engine's exhaust or boost air is released through the blowout valve, so that a section of the turbocharger compressor's operating line is close to the horizontal line under high load.

[0003] Currently, the commonly used exhaust gas regulation method relies on an exhaust gas bypass device installed at the turbocharger turbine end. This not only improves the engine's low-speed torque but also reduces exhaust smoke, decreasing air pollution and extending engine life. Under low-to-medium speed operating conditions, all exhaust gas enters the turbine to perform work; under high-speed operating conditions, the exhaust gas bypass valve on the turbine housing opens, allowing some exhaust gas to be discharged directly without passing through the turbine impeller, thus keeping the boost pressure within a safe range.

[0004] Traditional turbocharger exhaust bypass devices employ a rotary valve structure. Their working principle is as follows: the exhaust valve is securely connected to a rocker arm, and a power mechanism drives the rocker arm to rotate around its axis, thereby opening or closing the exhaust passage located on the turbine housing. At low to medium engine speeds, the exhaust valve is closed, and all the exhaust gas from the engine enters the turbine to perform work. At high engine speeds, the power mechanism drives the rocker arm to rotate, opening the exhaust valve and controlling its opening degree. A portion of the exhaust gas from the engine bypasses the exhaust passage to the volute outlet, achieving turbine-side bypass exhaust.

[0005] Currently, traditional rotary valves are simple in structure and easy to control. However, due to their poor flow characteristics, the flow rate exhibits a completely non-linear relationship with valve opening within a small range, and remains essentially unchanged with valve opening within a large range. Therefore, precise control of the venting volume is impossible. Furthermore, the pressure on the valve cover before and after valve opening differs significantly. The drastic changes in gas flow on both sides of the valve cover after opening cause drastic pressure fluctuations. Since the valve opening is directly related to the pressure on the valve cover, this results in continuous oscillation of the valve cover after opening. This oscillation leads to instability in turbine inlet pressure and exhaust gas bypass volume, affecting the operational stability of the turbocharger and even the engine. In addition, the continuous oscillation of the valve cover also accelerates mechanical wear on the actuator and power mechanism, reducing their lifespan and generating noise. Summary of the Invention

[0006] This application provides a turbine bypass venting device, a turbine, and a turbocharger, which can accurately control the valve opening and bypass venting volume, improve the working stability of the turbocharger, reduce noise, and extend the service life of the turbocharger.

[0007] In a first aspect, this application provides a turbine bypass venting device, including a mounting portion disposed inside a turbine housing, the mounting portion having an inner wall surface, and the turbine housing having a vent hole; the turbine bypass venting device further includes:

[0008] A bushing assembly is fixedly disposed on the mounting portion. The bushing assembly includes a first bushing and a second bushing, and the first bushing and the second bushing are respectively provided with a rotating inner cavity.

[0009] A rotary butterfly valve is provided at the mounting part. The rotary butterfly valve includes a valve body and two rotating shafts. The valve body is fixedly connected to the two rotating shafts. The two rotating shafts are rotatably connected to the two rotating inner cavities respectively. The valve body is provided with an inner cavity. The inner cavity, the inner wall surface and the vent hole cooperate to form a venting channel communicating with the turbine flow channel.

[0010] A power mechanism connected to the rotating shaft is used to drive the rotary butterfly valve to rotate, thereby adjusting the exhaust volume of the venting channel.

[0011] In some embodiments, the turbine bypass venting device further includes a valve seat, which is fixedly connected to the inside of the turbine housing. The valve seat is provided with the mounting portion, which includes two bushing mounting portions and a valve body mounting portion. The first bushing and the second bushing are respectively fixedly connected to the two bushing mounting portions. The valve body is disposed in the valve body mounting portion, and the inner wall surface is disposed in the valve body mounting portion.

[0012] In some embodiments, the clearance fit tolerance between the valve seat and the outer circle of the rotary butterfly valve is 0.05 mm to 0.2 mm.

[0013] In some embodiments, the valve body is provided with a valve plate, the valve plate including a first valve wall extending along the first direction, and the valve body further including a second valve wall and a third valve wall disposed on both sides of the first valve wall along the first direction, the first valve wall, the second valve wall and the third valve wall forming the inner cavity.

[0014] In some embodiments, there are multiple inner chambers, which are evenly distributed along the circumference of the valve body.

[0015] In some embodiments, the two rotating shafts are a first rotating shaft and a second rotating shaft, the first end of the first rotating shaft is fixedly connected to the valve body, the second end of the first rotating shaft is fixedly connected to the connecting shaft, and the first rotating shaft is fixedly connected to the power mechanism through the connecting shaft. The second rotating shaft is disposed on the end face of the valve body away from the power mechanism. The first rotating shaft, the valve body and the second rotating shaft are coaxially distributed, and the length of the first rotating shaft is greater than the length of the second rotating shaft.

[0016] In some embodiments, the power mechanism includes a transmission assembly and a drive member, the drive member being connected to the transmission assembly for providing driving force to the transmission assembly, and the transmission assembly being connected to the rotating shaft for transmitting driving force to the rotating shaft to drive the rotary butterfly valve to rotate.

[0017] In some embodiments, the transmission assembly includes a transmission rod and a mounting plate, the connecting shaft and the transmission rod are respectively fixed to both ends of the mounting plate, and the transmission rod is externally connected to the driving end of the driving member.

[0018] Secondly, embodiments of this application also provide a turbine, including a turbine housing, a turbine, and a turbine bypass venting device, wherein the turbine bypass venting device is specifically the turbine bypass venting device described in any of the above claims.

[0019] Thirdly, embodiments of this application also provide a turbocharger, including the turbine as described above.

[0020] In this embodiment, the valve cover structure is eliminated. A vent hole is provided on the turbine housing at the turbine end of the turbocharger, and an installation part is provided inside the turbine housing. A rotary butterfly valve is rotatably connected to the installation part through a bushing assembly. The rotary butterfly valve is connected to a power mechanism, and the power mechanism is connected to a drive device. The inner chamber of the rotary butterfly valve body cooperates with the inner wall surface of the installation part and the vent hole to form a venting channel that is directly connected to the turbine flow channel. When a rotary butterfly valve is rotated under force, the flow area of ​​the venting channel is directly changed by the change in the relative position between the valve body and the inner wall of the mounting part and the vent hole during the rotation. This allows for smooth opening or closing of the venting channel, uniformly adjusting the valve opening and the flow area of ​​the venting channel, resulting in a uniform change in flow rate. This avoids the problems of sudden changes in small valve openings and saturation at large openings, and prevents the opening of the rotary butterfly valve from being affected by pressure. The power mechanism can accurately determine the opening of the butterfly valve according to the engine's operating conditions, thereby achieving precise control of bypass venting volume and boost pressure. At this time, the bypass venting volume is only related to the engine's exhaust pressure and the butterfly valve opening. This eliminates the influence of pressure fluctuations caused by unstable flow on both sides of the valve cover, eliminates the influence of turbine inlet pressure fluctuations caused by the swing of the valve cover after the rotary valve is opened, avoids wear on the power mechanism, eliminates abnormal noise caused by valve cover swing, improves the stability of turbine operation, and extends the service life of moving parts such as the power mechanism. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this application. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0022] Figure 1 A schematic diagram of the turbine (turbine not shown) provided for some embodiments of this application;

[0023] Figure 2 A schematic diagram of the rotary butterfly valve in the open state in some embodiments of the turbine bypass venting device provided in this application;

[0024] Figure 3 A schematic diagram of the rotary butterfly valve in the closed state in some embodiments of the turbine bypass venting device provided in this application;

[0025] Figure 4 This is a schematic diagram of the assembly of the rotary butterfly valve, bushing assembly, and transmission assembly in a turbine bypass venting device provided in some embodiments of this application.

[0026] Figure 5This is a schematic diagram of the rotary butterfly valve in a turbine bypass venting device provided in some embodiments of this application.

[0027] The attached figures are labeled as follows:

[0028] 10-Turbine;

[0029] 1-Turbine housing; 2-Shaft sleeve assembly; 3-Rotary butterfly valve; 4-Power mechanism; 5-Valve seat;

[0030] 11-Mounting part; 12-Ventilation hole; 21-First bushing; 22-Second bushing; 31-Valve body; 32-First rotating shaft; 33-Second rotating shaft;

[0031] 311-Valve plate; 312-Inner chamber; 311a-First valve wall; 31a-Second valve wall; 31b-Third valve wall; 41-Transmission assembly; 411-Transmission rod; 412-Mounting plate;

[0032] X - First direction. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0034] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. The terms "first," "second," etc., are used to distinguish different objects, not to describe a particular order or hierarchy.

[0035] In this application, the reference to "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment that is mutually exclusive with other embodiments.

[0036] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0037] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0038] In the embodiments of this application, the same reference numerals denote the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width, and other dimensions of various components in the embodiments of this application shown in the accompanying drawings, as well as the overall thickness, length, width, and other dimensions of the integrated device, are merely illustrative and should not constitute any limitation on this application.

[0039] In this application, "multiple" means two or more (including two).

[0040] Please refer to Figure 1 This application provides a turbine bypass venting device, including a mounting portion 11 disposed inside a turbine housing 1. The mounting portion 11 has an inner wall surface. A vent hole 12 is provided on the turbine housing 1 corresponding to the position of the mounting portion 11. A bushing assembly 2 is fixedly installed inside the mounting portion 11. The bushing assembly 2 includes a first bushing 21 and a second bushing 22. The first bushing 21 and the second bushing 22 can be welded, connected by locking parts, or press-fitted with the mounting portion 11 to ensure the firmness of the installation of the first bushing 21 and the second bushing 22. The first bushing 21 and the second bushing 22 are respectively provided with rotating inner cavities. A rotary butterfly valve 3 is disposed in the mounting portion 11, including a valve body 31 and two rotating shafts. The valve body 31 is disposed between the two rotating shafts, and the two rotating shafts are respectively fixed on both sides of the valve body 31. The two rotating shafts are respectively rotatably installed in corresponding rotating inner cavities. The two bushings are used to fix and support the rotating shafts on both sides of the rotary butterfly valve 3, constrain the radial displacement of the rotating shafts, and only allow the rotating shafts to rotate axially, thereby eliminating the swing of the cantilever. The valve body 31 is provided with an inner chamber 312. The inner chamber 312, the inner wall of the turbine housing 1, and the vent hole 12 of the turbine housing 1 cooperate to form a turbine flow channel. The turbine flow channel is directly connected to the venting channel. By rotating the valve body 31, the opening of the venting channel is adjusted and the valve state is switched by adjusting the rotation of the valve body 31, thereby realizing the connection or closure of the turbine flow channel and the adjustment of the valve opening in the connected state.

[0041] The power mechanism 4 transmits the rotational driving force to the rotary butterfly valve 3, thereby driving the rotary butterfly valve 3 to rotate and thus adjusting the exhaust volume of the venting channel.

[0042] The turbine bypass venting device provided in this application works as follows: Driven by the power mechanism 4, the rotary butterfly valve 3 rotates, changing its position within the mounting section 11 to open and close the venting passage, and linearly adjusting the opening and closing size of the venting passage. At low engine speeds, the rotary butterfly valve 3 rotates to the closed venting passage state, such as... Figure 3 As shown, at this time, all the exhaust gas from the engine enters the turbine to perform work. At medium to high engine speeds, the rotary butterfly valve 3 rotates to the open position of the vent passage, as shown... Figure 2 Since the rotation angle of the rotary butterfly valve 3 is positively correlated with the opening area of ​​the channel, the flow area of ​​the rotary butterfly valve 3 changes linearly with the opening degree. This makes the bypass flow rate directly related to the valve opening degree. When the valve body 31 rotates, it uniformly changes the cross-sectional area of ​​the airflow channel, ensuring the accuracy and stability of flow regulation. This overcomes the defects of traditional rotary valves, such as nonlinear flow at small opening degrees and no flow change at large opening degrees. In addition, the opening degree of the rotary butterfly valve 3 is directly controlled by the power mechanism 4, and the rotary butterfly valve 3 is fixed by the bushing and only rotates around the axis. It is not affected by the gas pressure fluctuations on both sides of the valve, avoiding the valve cover swing caused by pressure difference and the interference of pressure fluctuations on the opening degree of traditional valves. Since the rotary butterfly valve 3 is fixed in the mounting part 11 inside the turbine housing 1, there is no swing phenomenon. This eliminates the turbine inlet pressure fluctuations, mechanical wear and noise caused by the swing of traditional valves, and improves the stability of turbine bypass venting.

[0043] It should be noted that the first direction in the embodiments of this application can be Figure 2 and Figure 3 The X direction in this context refers to the axial direction.

[0044] In one specific embodiment, the turbine bypass venting device further includes a valve seat 5, which is fixedly connected to the inside of the turbine housing 1. The valve seat 5 is provided with a mounting part 11, which includes two bushing mounting parts and a valve body mounting part. The first bushing 21 and the second bushing 22 are respectively fixedly connected to the two bushing mounting parts. The valve body 31 is disposed in the valve body mounting part, and the inner wall surface is disposed in the valve body mounting part.

[0045] The valve seat 5 is fixedly connected inside the turbine housing 1, serving as the supporting foundation for the integral rotary butterfly valve 3. It provides stable structural support, ensuring precise positioning of the valve body 31 and the bushing. The valve seat 5 also optimizes the airflow channel, reduces turbulence, and improves turbine efficiency. The valve seat 5 has a mounting portion 11, including two bushing mounting portions and one valve body mounting portion. The inner wall of the valve body mounting portion mates with the valve body 31 to form a sealing or airflow guiding structure. The valve seat 5 is fixedly connected to the turbine housing 1; the two can be welded or connected using locking components. Alternatively, the first bushing 21 and the second bushing 22 are fixed via the bushing mounting portions. The valve body mounting portion is used to mount the valve body 31, ensuring a stable relative position between the valve body 31 and the valve seat 5. The bushing mounting portions can be interference-fitted with the bushings or bolted in place. The valve body mounting portion is connected to the valve body 31 via a sliding or rotating fit. The first bushing 21 and the second bushing 22 support the valve stem or shaft and are fixedly connected to the bushing mounting portions of the valve seat 5 to ensure smooth movement. The valve body 31 is installed in the valve body mounting part and mates with the inner wall of the valve seat 5 to form an airtight airflow channel to reduce air leakage.

[0046] In this embodiment, the valve seat 5 is fixedly connected to the turbine housing 1, and the bushing and valve body 31 are precisely positioned, reducing the impact of vibration and making the structure more stable and reliable. The bushing can be made of wear-resistant material to ensure its service life. This solution combines the valve seat 5 with the bushing and valve body 31, which facilitates the disassembly and replacement of the rotary butterfly valve 3, making maintenance more convenient.

[0047] Optionally, the outer circle of the valve plate 311 and the valve seat 5 adopt a precision clearance fit. The clearance fit tolerance between the valve seat 5 and the outer circle of the rotary butterfly valve 3 is 0.05mm~0.2mm. Tests have shown that the clearance fit tolerance within this range can ensure the sealing performance when closed, avoid frictional resistance from interfering with the opening control, eliminate the hinge gap of the traditional rocker arm structure, and avoid swaying.

[0048] refer to Figure 4 and Figure 5 In one specific embodiment of the valve body 31, the valve body 31 is provided with a valve plate 311, the valve plate 311 includes a first valve wall surface 311a extending along a first direction X, and the valve body 31 includes a second valve wall surface 31a and a third valve wall surface 31b disposed on both sides of the first valve wall surface 311a along the first direction X, the first valve wall surface 311a, the second valve wall surface 31a and the third valve wall surface 31b forming an inner cavity 312.

[0049] The valve body 31 can be cylindrical, and the valve plate 311 can be flat, fitting with the valve seat 5 on the turbine housing 1 with clearance. The first valve wall surface 311a of the valve plate 311 is a plane along the first direction X, and the second and third valve wall surfaces 31a and 31b are also planar, forming a U-shaped inner chamber 312 with an opening. During rotation, the flow area can be symmetrically changed, resulting in uniform airflow distribution and avoiding asymmetric vortices. Furthermore, the inner chamber 312 formed by the valve plate 311 can be one location or two locations, such as... Figure 5 As shown, optionally, there are two inner chambers 312 with identical structures and symmetrical arrangement. The inner chambers 312 communicate with the inner wall and vent 12 during the rotation of the valve body 31, thereby enhancing the sealing performance of the inner chambers 312 and reducing the risk of leakage, making them particularly suitable for high-pressure and corrosive fluids. Furthermore, the valve plate 311 can be independently disassembled and replaced, facilitating adjustment of the size of the inner chambers 312.

[0050] The inner chamber 312 can be one or more, and optionally, it can be evenly distributed along the circumference of the valve body 31. The evenly distributed inner chamber 312 makes the mass of the valve body 31 symmetrical, reducing vibration amplitude and bushing wear during high-speed rotation. At the same time, the evenly distributed inner chamber 312 ensures that the exhaust gas enters the bypass channel symmetrically, avoiding pressure fluctuations caused by unilateral airflow impact, and making the airflow distribution uniform.

[0051] In one specific embodiment, the turbine bypass venting device adopts a dual-shaft design, specifically including a first shaft 32 and a second shaft 33. One end of the first shaft 32 is fixedly connected to the valve body 31, and the other end is fixedly connected to the power mechanism 4 via a connecting shaft. The first shaft 32 is relatively long, penetrating the turbine housing 1 and extending to the outside, and is used to transmit driving force. The second shaft 33 is fixed to the end face of the valve body 31 away from the power mechanism 4 on the other side, and is relatively short, serving only a supporting function. The first shaft 32, valve body 31, and second shaft 33 are coaxially arranged to ensure that the rotation center is consistent and to avoid eccentric wear. The first shaft 32 is directly fixed to the power mechanism 4 via the connecting shaft, eliminating transmission backlash and avoiding the loosening and lag problems at the hinge compared to the traditional rocker arm structure. The first rotating shaft 32 is relatively long, facilitating its connection to the external power mechanism 4 via the turbine housing 1. The first rotating shaft 32 and the second rotating shaft 33 together constrain the valve body 31, forming a double-support structure. This structure resists off-center loading of the valve body 31 caused by exhaust gas pressure fluctuations, achieving balanced support on both sides of the valve body 31. The short design of the second rotating shaft 33 reduces the overall inertia of the valve during rotation, improving dynamic response speed. The first rotating shaft 32, valve body 31, and second rotating shaft 33 are coaxially connected, achieved through integral machining or precision alignment, ensuring no radial runout during rotation and preventing localized wear of the bushing.

[0052] Therefore, in this embodiment, the dual-shaft structure with long shaft drive and short shaft support achieves dual optimization of zero backlash in power transmission and rotational stability. Its control precision, anti-sway capability and lifespan are significantly better than the traditional single-sided rocker arm structure. It can reduce turbine inlet pressure fluctuations and improve the smoothness of turbocharger operation, and is especially suitable for high-performance turbochargers.

[0053] In one specific embodiment, the power mechanism 4 includes a transmission assembly 41 and a drive member (not shown in the figure). The drive member is connected to the transmission assembly 41 and is used to provide driving force to the transmission assembly 41. The transmission assembly 41 is connected to a rotating shaft and transmits driving force to the rotating shaft to drive the rotary butterfly valve 3 to rotate.

[0054] The two rotating shafts are a first rotating shaft 32 and a second rotating shaft 33. The first end of the first rotating shaft 32 is fixedly connected to the valve body 31, and the second end of the first rotating shaft 32 is fixedly connected to the connecting shaft. The rotating shaft is fixedly connected to the power mechanism 4 through the connecting shaft. The second rotating shaft 33 is located on the end face of the valve body 31 away from the power mechanism 4. The first rotating shaft 32, the valve body 31 and the second rotating shaft 33 are coaxially distributed, and the length of the first rotating shaft 32 is greater than the length of the second rotating shaft 33.

[0055] The drive component can be a motor, pneumatic or hydraulic cylinder, etc., to provide stable and controllable driving force to adapt to different working conditions. The motor can be a servo or stepper motor to achieve precise start-stop and angle adjustment, thereby improving the control performance of the rotary butterfly valve 3. The drive component is connected to the transmission assembly 41 to provide driving force.

[0056] The transmission assembly 41 can be a vent valve, rocker arm assembly, gear set, pulley, coupling, etc. The input end of the transmission assembly 41 is connected to the drive component to receive power, and the output end of the transmission assembly 41 is connected to a rotating shaft to drive the rotary butterfly valve 3 to rotate. The rotational power of the drive component is transmitted directly or after speed change to the rotary butterfly valve 3. The cooperation between the drive component and the transmission assembly 41 ensures efficient power conversion, reduces energy loss, and enables precise adjustment of the opening degree of the rotary butterfly valve 3.

[0057] like Figure 4 As shown. Optionally, the transmission assembly 41 includes a transmission rod 411 and a mounting plate 412. The connecting shaft is fixedly connected to one end of the mounting plate 412 facing the valve body 31, and the transmission rod 411 is fixedly connected to one end of the mounting plate 412 facing the drive member and connected to the drive end of the drive member. It receives the drive from the drive member to drive the mounting plate 412 and thus drive the connecting shaft to rotate, providing driving force for the rotary butterfly valve 3, and realizing the opening and closing of the venting channel and the control of the opening and closing size.

[0058] In summary, this application provides a turbocharger bypass venting device. Venting is achieved using a rotary butterfly valve 3, which ensures that the flow rate and flow area characteristic curves of the rotary butterfly valve 3 exhibit a near-linear relationship. The opening degree and flow area of ​​the rotary butterfly valve 3 are precisely controlled, thus allowing for precise control of the exhaust gas bypass volume and achieving a good match between the turbocharger and the engine. In this application embodiment, the opening degree of the rotary butterfly valve 3 is unaffected by pressure; it is entirely controlled by the actuator. This avoids continuous changes in valve opening caused by pressure fluctuations on both sides of the valve cover due to unstable flow, improving the operational stability of the turbocharger and even the engine. Furthermore, the rotary butterfly valve 3 is confined to the valve seat 5, preventing the continuous swaying of the valve cover as seen in traditional valves. This avoids abnormal wear on the transmission and actuator mechanisms, extending the service life of these components and eliminating abnormal noise caused by valve cover swaying. Furthermore, this application has a simple structure and can be manufactured using existing turbocharger production technology and equipment. It achieves precise control of turbocharger bypass venting while maintaining low costs, effectively improving the working stability of the turbocharger and engine, extending the service life of the turbocharger, and can be applied to various types of turbochargers, with a wide range of applications.

[0059] Secondly, this application provides a turbine 10, including the turbine bypass venting device in any of the foregoing embodiments. The turbine bypass venting device enables the turbine 10 to operate smoothly and efficiently, while reducing noise and extending the service life of the turbine 10.

[0060] Thirdly, this application provides a turbocharger, including the aforementioned turbine 10, which has stable and reliable performance, low noise, good performance, and long service life.

[0061] It should be noted that the turbine and turbocharger provided in this application embodiment have the beneficial effects of the turbine bypass bleed device in any of the foregoing embodiments. For details, please refer to the foregoing description of the beneficial effects of the turbine bypass bleed device. This application embodiment will not repeat the description.

[0062] The turbine bypass venting device, turbine, and turbocharger provided in this application have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The descriptions of the embodiments above are merely for the purpose of helping to understand the method and core ideas of this application. It should be noted that those skilled in the art can make various improvements and modifications to this application without departing from its principles, and these improvements and modifications also fall within the protection scope of this application.

Claims

1. A turbine bypass venting device, characterized in that, The turbine bypass venting device includes a mounting portion (11) disposed inside the turbine housing (1), the mounting portion (11) having an inner wall surface, and the turbine housing (1) having a vent hole (12); the turbine bypass venting device further includes: A bushing assembly (2) is fixed to the mounting part (11). The bushing assembly (2) includes a first bushing (21) and a second bushing (22). The first bushing (21) and the second bushing (22) are respectively provided with rotating inner cavities. A rotary butterfly valve (3) is provided in the mounting part (11). The rotary butterfly valve (3) includes a valve body (31) and two rotating shafts. The valve body (31) is fixedly connected to the two rotating shafts. The two rotating shafts are rotatably connected to the two rotating inner cavities respectively. The valve body (31) is provided with an inner cavity (312). The inner cavity (312), the inner wall surface and the vent hole (12) cooperate to form an exhaust channel connected to the turbine flow channel. The opening and closing size of the exhaust channel is linearly adjusted. The rotation angle of the rotary butterfly valve (3) is positively correlated with the opening area of ​​the exhaust channel. The flow area and opening degree of the rotary butterfly valve (3) change linearly. The power mechanism (4) is connected to the rotating shaft and is used to drive the rotary butterfly valve (3) to rotate through the rotating shaft to adjust the exhaust volume of the exhaust passage. It is configured such that: when the engine is at low speed, the rotary butterfly valve (3) rotates to the closed state of the exhaust passage so that all the exhaust of the engine enters the turbine to do work; when the engine is at medium to high speed, the rotary butterfly valve (3) rotates to the open state of the exhaust passage, and the valve body (31) uniformly changes the cross-sectional area of ​​the airflow passage when rotating. The turbine bypass venting device also includes a valve seat (5), which is fixedly connected to the inside of the turbine housing (1). The valve seat (5) is provided with the mounting part (11), which includes two bushing mounting parts and a valve body mounting part. The first bushing (21) and the second bushing (22) are respectively fixedly connected to the two bushing mounting parts. The valve body (31) is provided in the valve body mounting part, and the inner wall surface is provided in the valve body mounting part. The valve body (31) is provided with a valve plate (311), the valve plate (311) includes a first valve wall surface (311a) extending along a first direction, the valve body (31) also includes a second valve wall surface (31a) and a third valve wall surface (31b) disposed on both sides of the first valve wall surface (311a) along the first direction, the first valve wall surface (311a), the second valve wall surface (31a) and the third valve wall surface (31b) form the inner cavity (312); The two rotating shafts are a first rotating shaft (32) and a second rotating shaft (33). The first end of the first rotating shaft (32) is fixed to the valve body (31), and the second end of the first rotating shaft (32) is fixed to the connecting shaft. The first rotating shaft (32) is fixedly connected to the power mechanism (4) through the connecting shaft. The second rotating shaft (33) is located on the end face of the valve body (31) away from the power mechanism (4). The first rotating shaft (32), the valve body (31) and the second rotating shaft (33) are coaxially distributed, and the length of the first rotating shaft (32) is greater than the length of the second rotating shaft (33).

2. The turbine bypass venting device according to claim 1, characterized in that, The clearance tolerance between the valve seat (5) and the outer circle of the rotary butterfly valve (3) is 0.05 mm ~ 0.2 mm.

3. The turbine bypass venting device according to claim 1, characterized in that, The inner chamber (312) is multiple and is evenly distributed along the circumference of the valve body (31).

4. The turbine bypass venting device according to claim 1, characterized in that, The power mechanism (4) includes a transmission assembly (41) and a drive member. The drive member is connected to the transmission assembly (41) and is used to provide driving force to the transmission assembly (41). The transmission assembly (41) is connected to the rotating shaft and is used to transmit driving force to the rotating shaft to drive the rotary butterfly valve (3) to rotate.

5. The turbine bypass venting device according to claim 4, characterized in that, The transmission assembly (41) includes a transmission rod (411) and a mounting plate (412). The connecting shaft and the transmission rod (411) are respectively fixed to the two ends of the mounting plate (412). The transmission rod (411) is externally connected to the driving end of the driving component.

6. A turbine, characterized in that, It includes a turbine housing (1), a turbine, and a turbine bypass venting device, wherein the turbine bypass venting device is specifically the turbine bypass venting device described in any one of claims 1 to 5.

7. A turbocharger, characterized in that, Including the turbine as described in claim 6 above.

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